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 static 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 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, 94 uint64_t obj, dmu_tx_t *tx); 95 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, 96 dmu_tx_t *tx); 97 98 static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f); 99 100 extern int spa_asize_inflation; 101 102 static zil_header_t zero_zil; 103 104 /* 105 * Figure out how much of this delta should be propagated to the dsl_dir 106 * layer. If there's a refreservation, that space has already been 107 * partially accounted for in our ancestors. 108 */ 109 static int64_t 110 parent_delta(dsl_dataset_t *ds, int64_t delta) 111 { 112 dsl_dataset_phys_t *ds_phys; 113 uint64_t old_bytes, new_bytes; 114 115 if (ds->ds_reserved == 0) 116 return (delta); 117 118 ds_phys = dsl_dataset_phys(ds); 119 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 120 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 121 122 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 123 return (new_bytes - old_bytes); 124 } 125 126 void 127 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 128 { 129 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 130 int used = bp_get_dsize_sync(spa, bp); 131 int compressed = BP_GET_PSIZE(bp); 132 int uncompressed = BP_GET_UCSIZE(bp); 133 int64_t delta; 134 spa_feature_t f; 135 136 dprintf_bp(bp, "ds=%p", ds); 137 138 ASSERT(dmu_tx_is_syncing(tx)); 139 /* It could have been compressed away to nothing */ 140 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 141 return; 142 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 143 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 144 if (ds == NULL) { 145 dsl_pool_mos_diduse_space(tx->tx_pool, 146 used, compressed, uncompressed); 147 return; 148 } 149 150 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 151 dmu_buf_will_dirty(ds->ds_dbuf, tx); 152 mutex_enter(&ds->ds_lock); 153 delta = parent_delta(ds, used); 154 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 155 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 156 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 157 dsl_dataset_phys(ds)->ds_unique_bytes += used; 158 159 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 160 ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] = 161 (void *)B_TRUE; 162 } 163 164 165 f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 166 if (f != SPA_FEATURE_NONE) { 167 ASSERT3S(spa_feature_table[f].fi_type, ==, 168 ZFEATURE_TYPE_BOOLEAN); 169 ds->ds_feature_activation[f] = (void *)B_TRUE; 170 } 171 172 f = zio_compress_to_feature(BP_GET_COMPRESS(bp)); 173 if (f != SPA_FEATURE_NONE) { 174 ASSERT3S(spa_feature_table[f].fi_type, ==, 175 ZFEATURE_TYPE_BOOLEAN); 176 ds->ds_feature_activation[f] = (void *)B_TRUE; 177 } 178 179 /* 180 * Track block for livelist, but ignore embedded blocks because 181 * they do not need to be freed. 182 */ 183 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 184 bp->blk_birth > ds->ds_dir->dd_origin_txg && 185 !(BP_IS_EMBEDDED(bp))) { 186 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 187 ASSERT(spa_feature_is_enabled(spa, 188 SPA_FEATURE_LIVELIST)); 189 bplist_append(&ds->ds_dir->dd_pending_allocs, bp); 190 } 191 192 mutex_exit(&ds->ds_lock); 193 dsl_dir_diduse_transfer_space(ds->ds_dir, delta, 194 compressed, uncompressed, used, 195 DD_USED_REFRSRV, DD_USED_HEAD, tx); 196 } 197 198 /* 199 * Called when the specified segment has been remapped, and is thus no 200 * longer referenced in the head dataset. The vdev must be indirect. 201 * 202 * If the segment is referenced by a snapshot, put it on the remap deadlist. 203 * Otherwise, add this segment to the obsolete spacemap. 204 */ 205 void 206 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, 207 uint64_t size, uint64_t birth, dmu_tx_t *tx) 208 { 209 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 210 211 ASSERT(dmu_tx_is_syncing(tx)); 212 ASSERT(birth <= tx->tx_txg); 213 ASSERT(!ds->ds_is_snapshot); 214 215 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 216 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 217 } else { 218 blkptr_t fakebp; 219 dva_t *dva = &fakebp.blk_dva[0]; 220 221 ASSERT(ds != NULL); 222 223 mutex_enter(&ds->ds_remap_deadlist_lock); 224 if (!dsl_dataset_remap_deadlist_exists(ds)) { 225 dsl_dataset_create_remap_deadlist(ds, tx); 226 } 227 mutex_exit(&ds->ds_remap_deadlist_lock); 228 229 BP_ZERO(&fakebp); 230 fakebp.blk_birth = birth; 231 DVA_SET_VDEV(dva, vdev); 232 DVA_SET_OFFSET(dva, offset); 233 DVA_SET_ASIZE(dva, size); 234 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, B_FALSE, 235 tx); 236 } 237 } 238 239 int 240 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 241 boolean_t async) 242 { 243 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 244 245 int used = bp_get_dsize_sync(spa, bp); 246 int compressed = BP_GET_PSIZE(bp); 247 int uncompressed = BP_GET_UCSIZE(bp); 248 249 if (BP_IS_HOLE(bp) || BP_IS_REDACTED(bp)) 250 return (0); 251 252 ASSERT(dmu_tx_is_syncing(tx)); 253 ASSERT(bp->blk_birth <= tx->tx_txg); 254 255 if (ds == NULL) { 256 dsl_free(tx->tx_pool, tx->tx_txg, bp); 257 dsl_pool_mos_diduse_space(tx->tx_pool, 258 -used, -compressed, -uncompressed); 259 return (used); 260 } 261 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 262 263 ASSERT(!ds->ds_is_snapshot); 264 dmu_buf_will_dirty(ds->ds_dbuf, tx); 265 266 /* 267 * Track block for livelist, but ignore embedded blocks because 268 * they do not need to be freed. 269 */ 270 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist) && 271 bp->blk_birth > ds->ds_dir->dd_origin_txg && 272 !(BP_IS_EMBEDDED(bp))) { 273 ASSERT(dsl_dir_is_clone(ds->ds_dir)); 274 ASSERT(spa_feature_is_enabled(spa, 275 SPA_FEATURE_LIVELIST)); 276 bplist_append(&ds->ds_dir->dd_pending_frees, bp); 277 } 278 279 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 280 int64_t delta; 281 282 dprintf_bp(bp, "freeing ds=%llu", (u_longlong_t)ds->ds_object); 283 dsl_free(tx->tx_pool, tx->tx_txg, bp); 284 285 mutex_enter(&ds->ds_lock); 286 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 287 !DS_UNIQUE_IS_ACCURATE(ds)); 288 delta = parent_delta(ds, -used); 289 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 290 mutex_exit(&ds->ds_lock); 291 dsl_dir_diduse_transfer_space(ds->ds_dir, 292 delta, -compressed, -uncompressed, -used, 293 DD_USED_REFRSRV, DD_USED_HEAD, tx); 294 } else { 295 dprintf_bp(bp, "putting on dead list: %s", ""); 296 if (async) { 297 /* 298 * We are here as part of zio's write done callback, 299 * which means we're a zio interrupt thread. We can't 300 * call dsl_deadlist_insert() now because it may block 301 * waiting for I/O. Instead, put bp on the deferred 302 * queue and let dsl_pool_sync() finish the job. 303 */ 304 bplist_append(&ds->ds_pending_deadlist, bp); 305 } else { 306 dsl_deadlist_insert(&ds->ds_deadlist, bp, B_FALSE, tx); 307 } 308 ASSERT3U(ds->ds_prev->ds_object, ==, 309 dsl_dataset_phys(ds)->ds_prev_snap_obj); 310 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 311 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 312 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 313 ds->ds_object && bp->blk_birth > 314 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 315 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 316 mutex_enter(&ds->ds_prev->ds_lock); 317 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 318 mutex_exit(&ds->ds_prev->ds_lock); 319 } 320 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 321 dsl_dir_transfer_space(ds->ds_dir, used, 322 DD_USED_HEAD, DD_USED_SNAP, tx); 323 } 324 } 325 326 dsl_bookmark_block_killed(ds, bp, tx); 327 328 mutex_enter(&ds->ds_lock); 329 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 330 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 331 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 332 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 333 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 334 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 335 mutex_exit(&ds->ds_lock); 336 337 return (used); 338 } 339 340 struct feature_type_uint64_array_arg { 341 uint64_t length; 342 uint64_t *array; 343 }; 344 345 static void 346 unload_zfeature(dsl_dataset_t *ds, spa_feature_t f) 347 { 348 switch (spa_feature_table[f].fi_type) { 349 case ZFEATURE_TYPE_BOOLEAN: 350 break; 351 case ZFEATURE_TYPE_UINT64_ARRAY: 352 { 353 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 354 kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t)); 355 kmem_free(ftuaa, sizeof (*ftuaa)); 356 break; 357 } 358 default: 359 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 360 } 361 } 362 363 static int 364 load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f) 365 { 366 int err = 0; 367 switch (spa_feature_table[f].fi_type) { 368 case ZFEATURE_TYPE_BOOLEAN: 369 err = zap_contains(mos, ds->ds_object, 370 spa_feature_table[f].fi_guid); 371 if (err == 0) { 372 ds->ds_feature[f] = (void *)B_TRUE; 373 } else { 374 ASSERT3U(err, ==, ENOENT); 375 err = 0; 376 } 377 break; 378 case ZFEATURE_TYPE_UINT64_ARRAY: 379 { 380 uint64_t int_size, num_int; 381 uint64_t *data; 382 err = zap_length(mos, ds->ds_object, 383 spa_feature_table[f].fi_guid, &int_size, &num_int); 384 if (err != 0) { 385 ASSERT3U(err, ==, ENOENT); 386 err = 0; 387 break; 388 } 389 ASSERT3U(int_size, ==, sizeof (uint64_t)); 390 data = kmem_alloc(int_size * num_int, KM_SLEEP); 391 VERIFY0(zap_lookup(mos, ds->ds_object, 392 spa_feature_table[f].fi_guid, int_size, num_int, data)); 393 struct feature_type_uint64_array_arg *ftuaa = 394 kmem_alloc(sizeof (*ftuaa), KM_SLEEP); 395 ftuaa->length = num_int; 396 ftuaa->array = data; 397 ds->ds_feature[f] = ftuaa; 398 break; 399 } 400 default: 401 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 402 } 403 return (err); 404 } 405 406 /* 407 * We have to release the fsid synchronously or we risk that a subsequent 408 * mount of the same dataset will fail to unique_insert the fsid. This 409 * failure would manifest itself as the fsid of this dataset changing 410 * between mounts which makes NFS clients quite unhappy. 411 */ 412 static void 413 dsl_dataset_evict_sync(void *dbu) 414 { 415 dsl_dataset_t *ds = dbu; 416 417 ASSERT(ds->ds_owner == NULL); 418 419 unique_remove(ds->ds_fsid_guid); 420 } 421 422 static void 423 dsl_dataset_evict_async(void *dbu) 424 { 425 dsl_dataset_t *ds = dbu; 426 427 ASSERT(ds->ds_owner == NULL); 428 429 ds->ds_dbuf = NULL; 430 431 if (ds->ds_objset != NULL) 432 dmu_objset_evict(ds->ds_objset); 433 434 if (ds->ds_prev) { 435 dsl_dataset_rele(ds->ds_prev, ds); 436 ds->ds_prev = NULL; 437 } 438 439 dsl_bookmark_fini_ds(ds); 440 441 bplist_destroy(&ds->ds_pending_deadlist); 442 if (dsl_deadlist_is_open(&ds->ds_deadlist)) 443 dsl_deadlist_close(&ds->ds_deadlist); 444 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 445 dsl_deadlist_close(&ds->ds_remap_deadlist); 446 if (ds->ds_dir) 447 dsl_dir_async_rele(ds->ds_dir, ds); 448 449 ASSERT(!list_link_active(&ds->ds_synced_link)); 450 451 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 452 if (dsl_dataset_feature_is_active(ds, f)) 453 unload_zfeature(ds, f); 454 } 455 456 list_destroy(&ds->ds_prop_cbs); 457 mutex_destroy(&ds->ds_lock); 458 mutex_destroy(&ds->ds_opening_lock); 459 mutex_destroy(&ds->ds_sendstream_lock); 460 mutex_destroy(&ds->ds_remap_deadlist_lock); 461 zfs_refcount_destroy(&ds->ds_longholds); 462 rrw_destroy(&ds->ds_bp_rwlock); 463 464 kmem_free(ds, sizeof (dsl_dataset_t)); 465 } 466 467 int 468 dsl_dataset_get_snapname(dsl_dataset_t *ds) 469 { 470 dsl_dataset_phys_t *headphys; 471 int err; 472 dmu_buf_t *headdbuf; 473 dsl_pool_t *dp = ds->ds_dir->dd_pool; 474 objset_t *mos = dp->dp_meta_objset; 475 476 if (ds->ds_snapname[0]) 477 return (0); 478 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 479 return (0); 480 481 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 482 FTAG, &headdbuf); 483 if (err != 0) 484 return (err); 485 headphys = headdbuf->db_data; 486 err = zap_value_search(dp->dp_meta_objset, 487 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 488 if (err != 0 && zfs_recover == B_TRUE) { 489 err = 0; 490 (void) snprintf(ds->ds_snapname, sizeof (ds->ds_snapname), 491 "SNAPOBJ=%llu-ERR=%d", 492 (unsigned long long)ds->ds_object, err); 493 } 494 dmu_buf_rele(headdbuf, FTAG); 495 return (err); 496 } 497 498 int 499 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 500 { 501 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 502 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 503 matchtype_t mt = 0; 504 int err; 505 506 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 507 mt = MT_NORMALIZE; 508 509 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 510 value, mt, NULL, 0, NULL); 511 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 512 err = zap_lookup(mos, snapobj, name, 8, 1, value); 513 return (err); 514 } 515 516 int 517 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 518 boolean_t adj_cnt) 519 { 520 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 521 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 522 matchtype_t mt = 0; 523 int err; 524 525 dsl_dir_snap_cmtime_update(ds->ds_dir); 526 527 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 528 mt = MT_NORMALIZE; 529 530 err = zap_remove_norm(mos, snapobj, name, mt, tx); 531 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 532 err = zap_remove(mos, snapobj, name, tx); 533 534 if (err == 0 && adj_cnt) 535 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 536 DD_FIELD_SNAPSHOT_COUNT, tx); 537 538 return (err); 539 } 540 541 boolean_t 542 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 543 { 544 dmu_buf_t *dbuf = ds->ds_dbuf; 545 boolean_t result = B_FALSE; 546 547 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 548 ds->ds_object, DMU_BONUS_BLKID, tag)) { 549 550 if (ds == dmu_buf_get_user(dbuf)) 551 result = B_TRUE; 552 else 553 dmu_buf_rele(dbuf, tag); 554 } 555 556 return (result); 557 } 558 559 int 560 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 561 dsl_dataset_t **dsp) 562 { 563 objset_t *mos = dp->dp_meta_objset; 564 dmu_buf_t *dbuf; 565 dsl_dataset_t *ds; 566 int err; 567 dmu_object_info_t doi; 568 569 ASSERT(dsl_pool_config_held(dp)); 570 571 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 572 if (err != 0) 573 return (err); 574 575 /* Make sure dsobj has the correct object type. */ 576 dmu_object_info_from_db(dbuf, &doi); 577 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 578 dmu_buf_rele(dbuf, tag); 579 return (SET_ERROR(EINVAL)); 580 } 581 582 ds = dmu_buf_get_user(dbuf); 583 if (ds == NULL) { 584 dsl_dataset_t *winner = NULL; 585 586 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 587 ds->ds_dbuf = dbuf; 588 ds->ds_object = dsobj; 589 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 590 list_link_init(&ds->ds_synced_link); 591 592 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, 593 NULL, ds, &ds->ds_dir); 594 if (err != 0) { 595 kmem_free(ds, sizeof (dsl_dataset_t)); 596 dmu_buf_rele(dbuf, tag); 597 return (err); 598 } 599 600 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 601 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 602 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 603 mutex_init(&ds->ds_remap_deadlist_lock, 604 NULL, MUTEX_DEFAULT, NULL); 605 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 606 zfs_refcount_create(&ds->ds_longholds); 607 608 bplist_create(&ds->ds_pending_deadlist); 609 610 list_create(&ds->ds_sendstreams, sizeof (dmu_sendstatus_t), 611 offsetof(dmu_sendstatus_t, dss_link)); 612 613 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 614 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 615 616 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 617 spa_feature_t f; 618 619 for (f = 0; f < SPA_FEATURES; f++) { 620 if (!(spa_feature_table[f].fi_flags & 621 ZFEATURE_FLAG_PER_DATASET)) 622 continue; 623 err = load_zfeature(mos, ds, f); 624 } 625 } 626 627 if (!ds->ds_is_snapshot) { 628 ds->ds_snapname[0] = '\0'; 629 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 630 err = dsl_dataset_hold_obj(dp, 631 dsl_dataset_phys(ds)->ds_prev_snap_obj, 632 ds, &ds->ds_prev); 633 } 634 err = dsl_bookmark_init_ds(ds); 635 } else { 636 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 637 err = dsl_dataset_get_snapname(ds); 638 if (err == 0 && 639 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 640 err = zap_count( 641 ds->ds_dir->dd_pool->dp_meta_objset, 642 dsl_dataset_phys(ds)->ds_userrefs_obj, 643 &ds->ds_userrefs); 644 } 645 } 646 647 if (err == 0 && !ds->ds_is_snapshot) { 648 err = dsl_prop_get_int_ds(ds, 649 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 650 &ds->ds_reserved); 651 if (err == 0) { 652 err = dsl_prop_get_int_ds(ds, 653 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 654 &ds->ds_quota); 655 } 656 } else { 657 ds->ds_reserved = ds->ds_quota = 0; 658 } 659 660 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 && 661 ds->ds_is_snapshot && 662 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { 663 dp->dp_spa->spa_errata = 664 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; 665 } 666 667 dsl_deadlist_open(&ds->ds_deadlist, 668 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 669 uint64_t remap_deadlist_obj = 670 dsl_dataset_get_remap_deadlist_object(ds); 671 if (remap_deadlist_obj != 0) { 672 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 673 remap_deadlist_obj); 674 } 675 676 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 677 dsl_dataset_evict_async, &ds->ds_dbuf); 678 if (err == 0) 679 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 680 681 if (err != 0 || winner != NULL) { 682 bplist_destroy(&ds->ds_pending_deadlist); 683 dsl_deadlist_close(&ds->ds_deadlist); 684 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 685 dsl_deadlist_close(&ds->ds_remap_deadlist); 686 dsl_bookmark_fini_ds(ds); 687 if (ds->ds_prev) 688 dsl_dataset_rele(ds->ds_prev, ds); 689 dsl_dir_rele(ds->ds_dir, ds); 690 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 691 if (dsl_dataset_feature_is_active(ds, f)) 692 unload_zfeature(ds, f); 693 } 694 695 list_destroy(&ds->ds_prop_cbs); 696 list_destroy(&ds->ds_sendstreams); 697 mutex_destroy(&ds->ds_lock); 698 mutex_destroy(&ds->ds_opening_lock); 699 mutex_destroy(&ds->ds_sendstream_lock); 700 mutex_destroy(&ds->ds_remap_deadlist_lock); 701 zfs_refcount_destroy(&ds->ds_longholds); 702 rrw_destroy(&ds->ds_bp_rwlock); 703 kmem_free(ds, sizeof (dsl_dataset_t)); 704 if (err != 0) { 705 dmu_buf_rele(dbuf, tag); 706 return (err); 707 } 708 ds = winner; 709 } else { 710 ds->ds_fsid_guid = 711 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 712 if (ds->ds_fsid_guid != 713 dsl_dataset_phys(ds)->ds_fsid_guid) { 714 zfs_dbgmsg("ds_fsid_guid changed from " 715 "%llx to %llx for pool %s dataset id %llu", 716 (long long) 717 dsl_dataset_phys(ds)->ds_fsid_guid, 718 (long long)ds->ds_fsid_guid, 719 spa_name(dp->dp_spa), 720 (u_longlong_t)dsobj); 721 } 722 } 723 } 724 725 ASSERT3P(ds->ds_dbuf, ==, dbuf); 726 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 727 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 728 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 729 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 730 *dsp = ds; 731 732 return (0); 733 } 734 735 int 736 dsl_dataset_create_key_mapping(dsl_dataset_t *ds) 737 { 738 dsl_dir_t *dd = ds->ds_dir; 739 740 if (dd->dd_crypto_obj == 0) 741 return (0); 742 743 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, 744 ds, ds, &ds->ds_key_mapping)); 745 } 746 747 int 748 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, 749 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp) 750 { 751 int err; 752 753 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 754 if (err != 0) 755 return (err); 756 757 ASSERT3P(*dsp, !=, NULL); 758 759 if (flags & DS_HOLD_FLAG_DECRYPT) { 760 err = dsl_dataset_create_key_mapping(*dsp); 761 if (err != 0) 762 dsl_dataset_rele(*dsp, tag); 763 } 764 765 return (err); 766 } 767 768 int 769 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 770 void *tag, dsl_dataset_t **dsp) 771 { 772 dsl_dir_t *dd; 773 const char *snapname; 774 uint64_t obj; 775 int err = 0; 776 dsl_dataset_t *ds; 777 778 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 779 if (err != 0) 780 return (err); 781 782 ASSERT(dsl_pool_config_held(dp)); 783 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 784 if (obj != 0) 785 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds); 786 else 787 err = SET_ERROR(ENOENT); 788 789 /* we may be looking for a snapshot */ 790 if (err == 0 && snapname != NULL) { 791 dsl_dataset_t *snap_ds; 792 793 if (*snapname++ != '@') { 794 dsl_dataset_rele_flags(ds, flags, tag); 795 dsl_dir_rele(dd, FTAG); 796 return (SET_ERROR(ENOENT)); 797 } 798 799 dprintf("looking for snapshot '%s'\n", snapname); 800 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 801 if (err == 0) { 802 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, 803 &snap_ds); 804 } 805 dsl_dataset_rele_flags(ds, flags, tag); 806 807 if (err == 0) { 808 mutex_enter(&snap_ds->ds_lock); 809 if (snap_ds->ds_snapname[0] == 0) 810 (void) strlcpy(snap_ds->ds_snapname, snapname, 811 sizeof (snap_ds->ds_snapname)); 812 mutex_exit(&snap_ds->ds_lock); 813 ds = snap_ds; 814 } 815 } 816 if (err == 0) 817 *dsp = ds; 818 dsl_dir_rele(dd, FTAG); 819 return (err); 820 } 821 822 int 823 dsl_dataset_hold(dsl_pool_t *dp, const char *name, void *tag, 824 dsl_dataset_t **dsp) 825 { 826 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); 827 } 828 829 static int 830 dsl_dataset_own_obj_impl(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 831 void *tag, boolean_t override, dsl_dataset_t **dsp) 832 { 833 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); 834 if (err != 0) 835 return (err); 836 if (!dsl_dataset_tryown(*dsp, tag, override)) { 837 dsl_dataset_rele_flags(*dsp, flags, tag); 838 *dsp = NULL; 839 return (SET_ERROR(EBUSY)); 840 } 841 return (0); 842 } 843 844 845 int 846 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 847 void *tag, dsl_dataset_t **dsp) 848 { 849 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_FALSE, dsp)); 850 } 851 852 int 853 dsl_dataset_own_obj_force(dsl_pool_t *dp, uint64_t dsobj, 854 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp) 855 { 856 return (dsl_dataset_own_obj_impl(dp, dsobj, flags, tag, B_TRUE, dsp)); 857 } 858 859 static int 860 dsl_dataset_own_impl(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 861 void *tag, boolean_t override, dsl_dataset_t **dsp) 862 { 863 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); 864 if (err != 0) 865 return (err); 866 if (!dsl_dataset_tryown(*dsp, tag, override)) { 867 dsl_dataset_rele_flags(*dsp, flags, tag); 868 return (SET_ERROR(EBUSY)); 869 } 870 return (0); 871 } 872 873 int 874 dsl_dataset_own_force(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 875 void *tag, dsl_dataset_t **dsp) 876 { 877 return (dsl_dataset_own_impl(dp, name, flags, tag, B_TRUE, dsp)); 878 } 879 880 int 881 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 882 void *tag, dsl_dataset_t **dsp) 883 { 884 return (dsl_dataset_own_impl(dp, name, flags, tag, B_FALSE, dsp)); 885 } 886 887 /* 888 * See the comment above dsl_pool_hold() for details. In summary, a long 889 * hold is used to prevent destruction of a dataset while the pool hold 890 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 891 * 892 * The dataset and pool must be held when this function is called. After it 893 * is called, the pool hold may be released while the dataset is still held 894 * and accessed. 895 */ 896 void 897 dsl_dataset_long_hold(dsl_dataset_t *ds, const void *tag) 898 { 899 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 900 (void) zfs_refcount_add(&ds->ds_longholds, tag); 901 } 902 903 void 904 dsl_dataset_long_rele(dsl_dataset_t *ds, const void *tag) 905 { 906 (void) zfs_refcount_remove(&ds->ds_longholds, tag); 907 } 908 909 /* Return B_TRUE if there are any long holds on this dataset. */ 910 boolean_t 911 dsl_dataset_long_held(dsl_dataset_t *ds) 912 { 913 return (!zfs_refcount_is_zero(&ds->ds_longholds)); 914 } 915 916 void 917 dsl_dataset_name(dsl_dataset_t *ds, char *name) 918 { 919 if (ds == NULL) { 920 (void) strlcpy(name, "mos", ZFS_MAX_DATASET_NAME_LEN); 921 } else { 922 dsl_dir_name(ds->ds_dir, name); 923 VERIFY0(dsl_dataset_get_snapname(ds)); 924 if (ds->ds_snapname[0]) { 925 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 926 <, ZFS_MAX_DATASET_NAME_LEN); 927 /* 928 * We use a "recursive" mutex so that we 929 * can call dprintf_ds() with ds_lock held. 930 */ 931 if (!MUTEX_HELD(&ds->ds_lock)) { 932 mutex_enter(&ds->ds_lock); 933 VERIFY3U(strlcat(name, ds->ds_snapname, 934 ZFS_MAX_DATASET_NAME_LEN), <, 935 ZFS_MAX_DATASET_NAME_LEN); 936 mutex_exit(&ds->ds_lock); 937 } else { 938 VERIFY3U(strlcat(name, ds->ds_snapname, 939 ZFS_MAX_DATASET_NAME_LEN), <, 940 ZFS_MAX_DATASET_NAME_LEN); 941 } 942 } 943 } 944 } 945 946 int 947 dsl_dataset_namelen(dsl_dataset_t *ds) 948 { 949 VERIFY0(dsl_dataset_get_snapname(ds)); 950 mutex_enter(&ds->ds_lock); 951 int len = strlen(ds->ds_snapname); 952 mutex_exit(&ds->ds_lock); 953 /* add '@' if ds is a snap */ 954 if (len > 0) 955 len++; 956 len += dsl_dir_namelen(ds->ds_dir); 957 return (len); 958 } 959 960 void 961 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 962 { 963 dmu_buf_rele(ds->ds_dbuf, tag); 964 } 965 966 void 967 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) 968 { 969 dsl_dir_t *dd = ds->ds_dir; 970 971 if (dd == NULL || dd->dd_crypto_obj == 0) 972 return; 973 974 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, 975 ds->ds_object, ds); 976 } 977 978 void 979 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 980 { 981 if (flags & DS_HOLD_FLAG_DECRYPT) 982 dsl_dataset_remove_key_mapping(ds); 983 984 dsl_dataset_rele(ds, tag); 985 } 986 987 void 988 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 989 { 990 ASSERT3P(ds->ds_owner, ==, tag); 991 ASSERT(ds->ds_dbuf != NULL); 992 993 mutex_enter(&ds->ds_lock); 994 ds->ds_owner = NULL; 995 mutex_exit(&ds->ds_lock); 996 dsl_dataset_long_rele(ds, tag); 997 dsl_dataset_rele_flags(ds, flags, tag); 998 } 999 1000 boolean_t 1001 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag, boolean_t override) 1002 { 1003 boolean_t gotit = FALSE; 1004 1005 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1006 mutex_enter(&ds->ds_lock); 1007 if (ds->ds_owner == NULL && (override || !(DS_IS_INCONSISTENT(ds) || 1008 (dsl_dataset_feature_is_active(ds, 1009 SPA_FEATURE_REDACTED_DATASETS) && 1010 !zfs_allow_redacted_dataset_mount)))) { 1011 ds->ds_owner = tag; 1012 dsl_dataset_long_hold(ds, tag); 1013 gotit = TRUE; 1014 } 1015 mutex_exit(&ds->ds_lock); 1016 return (gotit); 1017 } 1018 1019 boolean_t 1020 dsl_dataset_has_owner(dsl_dataset_t *ds) 1021 { 1022 boolean_t rv; 1023 mutex_enter(&ds->ds_lock); 1024 rv = (ds->ds_owner != NULL); 1025 mutex_exit(&ds->ds_lock); 1026 return (rv); 1027 } 1028 1029 static boolean_t 1030 zfeature_active(spa_feature_t f, void *arg) 1031 { 1032 switch (spa_feature_table[f].fi_type) { 1033 case ZFEATURE_TYPE_BOOLEAN: { 1034 boolean_t val = (boolean_t)(uintptr_t)arg; 1035 ASSERT(val == B_FALSE || val == B_TRUE); 1036 return (val); 1037 } 1038 case ZFEATURE_TYPE_UINT64_ARRAY: 1039 /* 1040 * In this case, arg is a uint64_t array. The feature is active 1041 * if the array is non-null. 1042 */ 1043 return (arg != NULL); 1044 default: 1045 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1046 return (B_FALSE); 1047 } 1048 } 1049 1050 boolean_t 1051 dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f) 1052 { 1053 return (zfeature_active(f, ds->ds_feature[f])); 1054 } 1055 1056 /* 1057 * The buffers passed out by this function are references to internal buffers; 1058 * they should not be freed by callers of this function, and they should not be 1059 * used after the dataset has been released. 1060 */ 1061 boolean_t 1062 dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f, 1063 uint64_t *outlength, uint64_t **outp) 1064 { 1065 VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY); 1066 if (!dsl_dataset_feature_is_active(ds, f)) { 1067 return (B_FALSE); 1068 } 1069 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 1070 *outp = ftuaa->array; 1071 *outlength = ftuaa->length; 1072 return (B_TRUE); 1073 } 1074 1075 void 1076 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg, 1077 dmu_tx_t *tx) 1078 { 1079 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1080 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1081 uint64_t zero = 0; 1082 1083 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1084 1085 spa_feature_incr(spa, f, tx); 1086 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1087 1088 switch (spa_feature_table[f].fi_type) { 1089 case ZFEATURE_TYPE_BOOLEAN: 1090 ASSERT3S((boolean_t)(uintptr_t)arg, ==, B_TRUE); 1091 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1092 sizeof (zero), 1, &zero, tx)); 1093 break; 1094 case ZFEATURE_TYPE_UINT64_ARRAY: 1095 { 1096 struct feature_type_uint64_array_arg *ftuaa = arg; 1097 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1098 sizeof (uint64_t), ftuaa->length, ftuaa->array, tx)); 1099 break; 1100 } 1101 default: 1102 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1103 } 1104 } 1105 1106 static void 1107 dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f, 1108 dmu_tx_t *tx) 1109 { 1110 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1111 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1112 uint64_t dsobj = ds->ds_object; 1113 1114 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1115 1116 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 1117 spa_feature_decr(spa, f, tx); 1118 ds->ds_feature[f] = NULL; 1119 } 1120 1121 void 1122 dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx) 1123 { 1124 unload_zfeature(ds, f); 1125 dsl_dataset_deactivate_feature_impl(ds, f, tx); 1126 } 1127 1128 uint64_t 1129 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 1130 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx) 1131 { 1132 dsl_pool_t *dp = dd->dd_pool; 1133 dmu_buf_t *dbuf; 1134 dsl_dataset_phys_t *dsphys; 1135 uint64_t dsobj; 1136 objset_t *mos = dp->dp_meta_objset; 1137 1138 if (origin == NULL) 1139 origin = dp->dp_origin_snap; 1140 1141 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 1142 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 1143 ASSERT(dmu_tx_is_syncing(tx)); 1144 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 1145 1146 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1147 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1148 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1149 dmu_buf_will_dirty(dbuf, tx); 1150 dsphys = dbuf->db_data; 1151 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1152 dsphys->ds_dir_obj = dd->dd_object; 1153 dsphys->ds_flags = flags; 1154 dsphys->ds_fsid_guid = unique_create(); 1155 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1156 sizeof (dsphys->ds_guid)); 1157 dsphys->ds_snapnames_zapobj = 1158 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 1159 DMU_OT_NONE, 0, tx); 1160 dsphys->ds_creation_time = gethrestime_sec(); 1161 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 1162 1163 if (origin == NULL) { 1164 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 1165 } else { 1166 dsl_dataset_t *ohds; /* head of the origin snapshot */ 1167 1168 dsphys->ds_prev_snap_obj = origin->ds_object; 1169 dsphys->ds_prev_snap_txg = 1170 dsl_dataset_phys(origin)->ds_creation_txg; 1171 dsphys->ds_referenced_bytes = 1172 dsl_dataset_phys(origin)->ds_referenced_bytes; 1173 dsphys->ds_compressed_bytes = 1174 dsl_dataset_phys(origin)->ds_compressed_bytes; 1175 dsphys->ds_uncompressed_bytes = 1176 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 1177 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 1178 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 1179 rrw_exit(&origin->ds_bp_rwlock, FTAG); 1180 1181 /* 1182 * Inherit flags that describe the dataset's contents 1183 * (INCONSISTENT) or properties (Case Insensitive). 1184 */ 1185 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 1186 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 1187 1188 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1189 if (zfeature_active(f, origin->ds_feature[f])) { 1190 dsl_dataset_activate_feature(dsobj, f, 1191 origin->ds_feature[f], tx); 1192 } 1193 } 1194 1195 dmu_buf_will_dirty(origin->ds_dbuf, tx); 1196 dsl_dataset_phys(origin)->ds_num_children++; 1197 1198 VERIFY0(dsl_dataset_hold_obj(dp, 1199 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 1200 FTAG, &ohds)); 1201 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 1202 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 1203 dsl_dataset_rele(ohds, FTAG); 1204 1205 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 1206 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 1207 dsl_dataset_phys(origin)->ds_next_clones_obj = 1208 zap_create(mos, 1209 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 1210 } 1211 VERIFY0(zap_add_int(mos, 1212 dsl_dataset_phys(origin)->ds_next_clones_obj, 1213 dsobj, tx)); 1214 } 1215 1216 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1217 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 1218 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 1219 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 1220 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 1221 dsl_dir_phys(origin->ds_dir)->dd_clones = 1222 zap_create(mos, 1223 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 1224 } 1225 VERIFY0(zap_add_int(mos, 1226 dsl_dir_phys(origin->ds_dir)->dd_clones, 1227 dsobj, tx)); 1228 } 1229 } 1230 1231 /* handle encryption */ 1232 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx); 1233 1234 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1235 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1236 1237 dmu_buf_rele(dbuf, FTAG); 1238 1239 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1240 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 1241 1242 return (dsobj); 1243 } 1244 1245 static void 1246 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 1247 { 1248 objset_t *os; 1249 1250 VERIFY0(dmu_objset_from_ds(ds, &os)); 1251 if (memcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 1252 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1253 zio_t *zio; 1254 1255 memset(&os->os_zil_header, 0, sizeof (os->os_zil_header)); 1256 if (os->os_encrypted) 1257 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; 1258 1259 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1260 dsl_dataset_sync(ds, zio, tx); 1261 VERIFY0(zio_wait(zio)); 1262 1263 /* dsl_dataset_sync_done will drop this reference. */ 1264 dmu_buf_add_ref(ds->ds_dbuf, ds); 1265 dsl_dataset_sync_done(ds, tx); 1266 } 1267 } 1268 1269 uint64_t 1270 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1271 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1272 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1273 { 1274 dsl_pool_t *dp = pdd->dd_pool; 1275 uint64_t dsobj, ddobj; 1276 dsl_dir_t *dd; 1277 1278 ASSERT(dmu_tx_is_syncing(tx)); 1279 ASSERT(lastname[0] != '@'); 1280 /* 1281 * Filesystems will eventually have their origin set to dp_origin_snap, 1282 * but that's taken care of in dsl_dataset_create_sync_dd. When 1283 * creating a filesystem, this function is called with origin equal to 1284 * NULL. 1285 */ 1286 if (origin != NULL) 1287 ASSERT3P(origin, !=, dp->dp_origin_snap); 1288 1289 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1290 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1291 1292 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1293 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1294 1295 dsl_deleg_set_create_perms(dd, tx, cr); 1296 1297 /* 1298 * If we are creating a clone and the livelist feature is enabled, 1299 * add the entry DD_FIELD_LIVELIST to ZAP. 1300 */ 1301 if (origin != NULL && 1302 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LIVELIST)) { 1303 objset_t *mos = dd->dd_pool->dp_meta_objset; 1304 dsl_dir_zapify(dd, tx); 1305 uint64_t obj = dsl_deadlist_alloc(mos, tx); 1306 VERIFY0(zap_add(mos, dd->dd_object, DD_FIELD_LIVELIST, 1307 sizeof (uint64_t), 1, &obj, tx)); 1308 spa_feature_incr(dp->dp_spa, SPA_FEATURE_LIVELIST, tx); 1309 } 1310 1311 /* 1312 * Since we're creating a new node we know it's a leaf, so we can 1313 * initialize the counts if the limit feature is active. 1314 */ 1315 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1316 uint64_t cnt = 0; 1317 objset_t *os = dd->dd_pool->dp_meta_objset; 1318 1319 dsl_dir_zapify(dd, tx); 1320 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1321 sizeof (cnt), 1, &cnt, tx)); 1322 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1323 sizeof (cnt), 1, &cnt, tx)); 1324 } 1325 1326 dsl_dir_rele(dd, FTAG); 1327 1328 /* 1329 * If we are creating a clone, make sure we zero out any stale 1330 * data from the origin snapshots zil header. 1331 */ 1332 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1333 dsl_dataset_t *ds; 1334 1335 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1336 dsl_dataset_zero_zil(ds, tx); 1337 dsl_dataset_rele(ds, FTAG); 1338 } 1339 1340 return (dsobj); 1341 } 1342 1343 /* 1344 * The unique space in the head dataset can be calculated by subtracting 1345 * the space used in the most recent snapshot, that is still being used 1346 * in this file system, from the space currently in use. To figure out 1347 * the space in the most recent snapshot still in use, we need to take 1348 * the total space used in the snapshot and subtract out the space that 1349 * has been freed up since the snapshot was taken. 1350 */ 1351 void 1352 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1353 { 1354 uint64_t mrs_used; 1355 uint64_t dlused, dlcomp, dluncomp; 1356 1357 ASSERT(!ds->ds_is_snapshot); 1358 1359 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1360 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1361 else 1362 mrs_used = 0; 1363 1364 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1365 1366 ASSERT3U(dlused, <=, mrs_used); 1367 dsl_dataset_phys(ds)->ds_unique_bytes = 1368 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1369 1370 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1371 SPA_VERSION_UNIQUE_ACCURATE) 1372 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1373 } 1374 1375 void 1376 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1377 dmu_tx_t *tx) 1378 { 1379 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1380 uint64_t count __maybe_unused; 1381 int err; 1382 1383 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1384 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1385 obj, tx); 1386 /* 1387 * The err should not be ENOENT, but a bug in a previous version 1388 * of the code could cause upgrade_clones_cb() to not set 1389 * ds_next_snap_obj when it should, leading to a missing entry. 1390 * If we knew that the pool was created after 1391 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1392 * ENOENT. However, at least we can check that we don't have 1393 * too many entries in the next_clones_obj even after failing to 1394 * remove this one. 1395 */ 1396 if (err != ENOENT) 1397 VERIFY0(err); 1398 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1399 &count)); 1400 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1401 } 1402 1403 1404 blkptr_t * 1405 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1406 { 1407 return (&dsl_dataset_phys(ds)->ds_bp); 1408 } 1409 1410 spa_t * 1411 dsl_dataset_get_spa(dsl_dataset_t *ds) 1412 { 1413 return (ds->ds_dir->dd_pool->dp_spa); 1414 } 1415 1416 void 1417 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1418 { 1419 dsl_pool_t *dp; 1420 1421 if (ds == NULL) /* this is the meta-objset */ 1422 return; 1423 1424 ASSERT(ds->ds_objset != NULL); 1425 1426 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1427 panic("dirtying snapshot!"); 1428 1429 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1430 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1431 1432 dp = ds->ds_dir->dd_pool; 1433 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1434 objset_t *os = ds->ds_objset; 1435 1436 /* up the hold count until we can be written out */ 1437 dmu_buf_add_ref(ds->ds_dbuf, ds); 1438 1439 /* if this dataset is encrypted, grab a reference to the DCK */ 1440 if (ds->ds_dir->dd_crypto_obj != 0 && 1441 !os->os_raw_receive && 1442 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1443 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1444 key_mapping_add_ref(ds->ds_key_mapping, ds); 1445 } 1446 } 1447 } 1448 1449 static int 1450 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1451 { 1452 uint64_t asize; 1453 1454 if (!dmu_tx_is_syncing(tx)) 1455 return (0); 1456 1457 /* 1458 * If there's an fs-only reservation, any blocks that might become 1459 * owned by the snapshot dataset must be accommodated by space 1460 * outside of the reservation. 1461 */ 1462 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1463 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1464 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1465 return (SET_ERROR(ENOSPC)); 1466 1467 /* 1468 * Propagate any reserved space for this snapshot to other 1469 * snapshot checks in this sync group. 1470 */ 1471 if (asize > 0) 1472 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1473 1474 return (0); 1475 } 1476 1477 int 1478 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1479 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr, proc_t *proc) 1480 { 1481 int error; 1482 uint64_t value; 1483 1484 ds->ds_trysnap_txg = tx->tx_txg; 1485 1486 if (!dmu_tx_is_syncing(tx)) 1487 return (0); 1488 1489 /* 1490 * We don't allow multiple snapshots of the same txg. If there 1491 * is already one, try again. 1492 */ 1493 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1494 return (SET_ERROR(EAGAIN)); 1495 1496 /* 1497 * Check for conflicting snapshot name. 1498 */ 1499 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1500 if (error == 0) 1501 return (SET_ERROR(EEXIST)); 1502 if (error != ENOENT) 1503 return (error); 1504 1505 /* 1506 * We don't allow taking snapshots of inconsistent datasets, such as 1507 * those into which we are currently receiving. However, if we are 1508 * creating this snapshot as part of a receive, this check will be 1509 * executed atomically with respect to the completion of the receive 1510 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1511 * case we ignore this, knowing it will be fixed up for us shortly in 1512 * dmu_recv_end_sync(). 1513 */ 1514 if (!recv && DS_IS_INCONSISTENT(ds)) 1515 return (SET_ERROR(EBUSY)); 1516 1517 /* 1518 * Skip the check for temporary snapshots or if we have already checked 1519 * the counts in dsl_dataset_snapshot_check. This means we really only 1520 * check the count here when we're receiving a stream. 1521 */ 1522 if (cnt != 0 && cr != NULL) { 1523 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1524 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr, proc); 1525 if (error != 0) 1526 return (error); 1527 } 1528 1529 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1530 if (error != 0) 1531 return (error); 1532 1533 return (0); 1534 } 1535 1536 int 1537 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1538 { 1539 dsl_dataset_snapshot_arg_t *ddsa = arg; 1540 dsl_pool_t *dp = dmu_tx_pool(tx); 1541 nvpair_t *pair; 1542 int rv = 0; 1543 1544 /* 1545 * Pre-compute how many total new snapshots will be created for each 1546 * level in the tree and below. This is needed for validating the 1547 * snapshot limit when either taking a recursive snapshot or when 1548 * taking multiple snapshots. 1549 * 1550 * The problem is that the counts are not actually adjusted when 1551 * we are checking, only when we finally sync. For a single snapshot, 1552 * this is easy, the count will increase by 1 at each node up the tree, 1553 * but its more complicated for the recursive/multiple snapshot case. 1554 * 1555 * The dsl_fs_ss_limit_check function does recursively check the count 1556 * at each level up the tree but since it is validating each snapshot 1557 * independently we need to be sure that we are validating the complete 1558 * count for the entire set of snapshots. We do this by rolling up the 1559 * counts for each component of the name into an nvlist and then 1560 * checking each of those cases with the aggregated count. 1561 * 1562 * This approach properly handles not only the recursive snapshot 1563 * case (where we get all of those on the ddsa_snaps list) but also 1564 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1565 * validate the limit on 'a' using a count of 2). 1566 * 1567 * We validate the snapshot names in the third loop and only report 1568 * name errors once. 1569 */ 1570 if (dmu_tx_is_syncing(tx)) { 1571 char *nm; 1572 nvlist_t *cnt_track = NULL; 1573 cnt_track = fnvlist_alloc(); 1574 1575 nm = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1576 1577 /* Rollup aggregated counts into the cnt_track list */ 1578 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1579 pair != NULL; 1580 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1581 char *pdelim; 1582 uint64_t val; 1583 1584 (void) strlcpy(nm, nvpair_name(pair), MAXPATHLEN); 1585 pdelim = strchr(nm, '@'); 1586 if (pdelim == NULL) 1587 continue; 1588 *pdelim = '\0'; 1589 1590 do { 1591 if (nvlist_lookup_uint64(cnt_track, nm, 1592 &val) == 0) { 1593 /* update existing entry */ 1594 fnvlist_add_uint64(cnt_track, nm, 1595 val + 1); 1596 } else { 1597 /* add to list */ 1598 fnvlist_add_uint64(cnt_track, nm, 1); 1599 } 1600 1601 pdelim = strrchr(nm, '/'); 1602 if (pdelim != NULL) 1603 *pdelim = '\0'; 1604 } while (pdelim != NULL); 1605 } 1606 1607 kmem_free(nm, MAXPATHLEN); 1608 1609 /* Check aggregated counts at each level */ 1610 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1611 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1612 int error = 0; 1613 char *name; 1614 uint64_t cnt = 0; 1615 dsl_dataset_t *ds; 1616 1617 name = nvpair_name(pair); 1618 cnt = fnvpair_value_uint64(pair); 1619 ASSERT(cnt > 0); 1620 1621 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1622 if (error == 0) { 1623 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1624 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1625 ddsa->ddsa_cr, ddsa->ddsa_proc); 1626 dsl_dataset_rele(ds, FTAG); 1627 } 1628 1629 if (error != 0) { 1630 if (ddsa->ddsa_errors != NULL) 1631 fnvlist_add_int32(ddsa->ddsa_errors, 1632 name, error); 1633 rv = error; 1634 /* only report one error for this check */ 1635 break; 1636 } 1637 } 1638 nvlist_free(cnt_track); 1639 } 1640 1641 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1642 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1643 int error = 0; 1644 dsl_dataset_t *ds; 1645 char *name, *atp = NULL; 1646 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1647 1648 name = nvpair_name(pair); 1649 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1650 error = SET_ERROR(ENAMETOOLONG); 1651 if (error == 0) { 1652 atp = strchr(name, '@'); 1653 if (atp == NULL) 1654 error = SET_ERROR(EINVAL); 1655 if (error == 0) 1656 (void) strlcpy(dsname, name, atp - name + 1); 1657 } 1658 if (error == 0) 1659 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1660 if (error == 0) { 1661 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1662 error = dsl_dataset_snapshot_check_impl(ds, 1663 atp + 1, tx, B_FALSE, 0, NULL, NULL); 1664 dsl_dataset_rele(ds, FTAG); 1665 } 1666 1667 if (error != 0) { 1668 if (ddsa->ddsa_errors != NULL) { 1669 fnvlist_add_int32(ddsa->ddsa_errors, 1670 name, error); 1671 } 1672 rv = error; 1673 } 1674 } 1675 1676 return (rv); 1677 } 1678 1679 void 1680 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1681 dmu_tx_t *tx) 1682 { 1683 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1684 dmu_buf_t *dbuf; 1685 dsl_dataset_phys_t *dsphys; 1686 uint64_t dsobj, crtxg; 1687 objset_t *mos = dp->dp_meta_objset; 1688 static zil_header_t zero_zil __maybe_unused; 1689 objset_t *os __maybe_unused; 1690 1691 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1692 1693 /* 1694 * If we are on an old pool, the zil must not be active, in which 1695 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1696 */ 1697 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1698 dmu_objset_from_ds(ds, &os) != 0 || 1699 memcmp(&os->os_phys->os_zil_header, &zero_zil, 1700 sizeof (zero_zil)) == 0); 1701 1702 /* Should not snapshot a dirty dataset. */ 1703 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1704 ds, tx->tx_txg)); 1705 1706 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1707 1708 /* 1709 * The origin's ds_creation_txg has to be < TXG_INITIAL 1710 */ 1711 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1712 crtxg = 1; 1713 else 1714 crtxg = tx->tx_txg; 1715 1716 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1717 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1718 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1719 dmu_buf_will_dirty(dbuf, tx); 1720 dsphys = dbuf->db_data; 1721 memset(dsphys, 0, sizeof (dsl_dataset_phys_t)); 1722 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1723 dsphys->ds_fsid_guid = unique_create(); 1724 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1725 sizeof (dsphys->ds_guid)); 1726 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1727 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1728 dsphys->ds_next_snap_obj = ds->ds_object; 1729 dsphys->ds_num_children = 1; 1730 dsphys->ds_creation_time = gethrestime_sec(); 1731 dsphys->ds_creation_txg = crtxg; 1732 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1733 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1734 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1735 dsphys->ds_uncompressed_bytes = 1736 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1737 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1738 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1739 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1740 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1741 dmu_buf_rele(dbuf, FTAG); 1742 1743 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1744 if (zfeature_active(f, ds->ds_feature[f])) { 1745 dsl_dataset_activate_feature(dsobj, f, 1746 ds->ds_feature[f], tx); 1747 } 1748 } 1749 1750 ASSERT3U(ds->ds_prev != 0, ==, 1751 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1752 if (ds->ds_prev) { 1753 uint64_t next_clones_obj = 1754 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1755 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1756 ds->ds_object || 1757 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1758 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1759 ds->ds_object) { 1760 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1761 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1762 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1763 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1764 } else if (next_clones_obj != 0) { 1765 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1766 dsphys->ds_next_snap_obj, tx); 1767 VERIFY0(zap_add_int(mos, 1768 next_clones_obj, dsobj, tx)); 1769 } 1770 } 1771 1772 /* 1773 * If we have a reference-reservation on this dataset, we will 1774 * need to increase the amount of refreservation being charged 1775 * since our unique space is going to zero. 1776 */ 1777 if (ds->ds_reserved) { 1778 int64_t delta; 1779 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1780 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1781 ds->ds_reserved); 1782 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1783 delta, 0, 0, tx); 1784 } 1785 1786 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1787 dsl_dataset_phys(ds)->ds_deadlist_obj = 1788 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1789 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1790 dsl_deadlist_close(&ds->ds_deadlist); 1791 dsl_deadlist_open(&ds->ds_deadlist, mos, 1792 dsl_dataset_phys(ds)->ds_deadlist_obj); 1793 dsl_deadlist_add_key(&ds->ds_deadlist, 1794 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1795 dsl_bookmark_snapshotted(ds, tx); 1796 1797 if (dsl_dataset_remap_deadlist_exists(ds)) { 1798 uint64_t remap_deadlist_obj = 1799 dsl_dataset_get_remap_deadlist_object(ds); 1800 /* 1801 * Move the remap_deadlist to the snapshot. The head 1802 * will create a new remap deadlist on demand, from 1803 * dsl_dataset_block_remapped(). 1804 */ 1805 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1806 dsl_deadlist_close(&ds->ds_remap_deadlist); 1807 1808 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1809 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1810 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1811 } 1812 1813 /* 1814 * Create a ivset guid for this snapshot if the dataset is 1815 * encrypted. This may be overridden by a raw receive. A 1816 * previous implementation of this code did not have this 1817 * field as part of the on-disk format for ZFS encryption 1818 * (see errata #4). As part of the remediation for this 1819 * issue, we ask the user to enable the bookmark_v2 feature 1820 * which is now a dependency of the encryption feature. We 1821 * use this as a heuristic to determine when the user has 1822 * elected to correct any datasets created with the old code. 1823 * As a result, we only do this step if the bookmark_v2 1824 * feature is enabled, which limits the number of states a 1825 * given pool / dataset can be in with regards to terms of 1826 * correcting the issue. 1827 */ 1828 if (ds->ds_dir->dd_crypto_obj != 0 && 1829 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1830 uint64_t ivset_guid = unique_create(); 1831 1832 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1833 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1834 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1835 } 1836 1837 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1838 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1839 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1840 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1841 1842 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1843 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1844 1845 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1846 snapname, 8, 1, &dsobj, tx)); 1847 1848 if (ds->ds_prev) 1849 dsl_dataset_rele(ds->ds_prev, ds); 1850 VERIFY0(dsl_dataset_hold_obj(dp, 1851 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1852 1853 dsl_scan_ds_snapshotted(ds, tx); 1854 1855 dsl_dir_snap_cmtime_update(ds->ds_dir); 1856 1857 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, " "); 1858 } 1859 1860 void 1861 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1862 { 1863 dsl_dataset_snapshot_arg_t *ddsa = arg; 1864 dsl_pool_t *dp = dmu_tx_pool(tx); 1865 nvpair_t *pair; 1866 1867 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1868 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1869 dsl_dataset_t *ds; 1870 char *name, *atp; 1871 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1872 1873 name = nvpair_name(pair); 1874 atp = strchr(name, '@'); 1875 (void) strlcpy(dsname, name, atp - name + 1); 1876 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1877 1878 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1879 if (ddsa->ddsa_props != NULL) { 1880 dsl_props_set_sync_impl(ds->ds_prev, 1881 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1882 } 1883 dsl_dataset_rele(ds, FTAG); 1884 } 1885 } 1886 1887 /* 1888 * The snapshots must all be in the same pool. 1889 * All-or-nothing: if there are any failures, nothing will be modified. 1890 */ 1891 int 1892 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1893 { 1894 dsl_dataset_snapshot_arg_t ddsa; 1895 nvpair_t *pair; 1896 boolean_t needsuspend; 1897 int error; 1898 spa_t *spa; 1899 char *firstname; 1900 nvlist_t *suspended = NULL; 1901 1902 pair = nvlist_next_nvpair(snaps, NULL); 1903 if (pair == NULL) 1904 return (0); 1905 firstname = nvpair_name(pair); 1906 1907 error = spa_open(firstname, &spa, FTAG); 1908 if (error != 0) 1909 return (error); 1910 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1911 spa_close(spa, FTAG); 1912 1913 if (needsuspend) { 1914 suspended = fnvlist_alloc(); 1915 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1916 pair = nvlist_next_nvpair(snaps, pair)) { 1917 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1918 char *snapname = nvpair_name(pair); 1919 char *atp; 1920 void *cookie; 1921 1922 atp = strchr(snapname, '@'); 1923 if (atp == NULL) { 1924 error = SET_ERROR(EINVAL); 1925 break; 1926 } 1927 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1928 1929 error = zil_suspend(fsname, &cookie); 1930 if (error != 0) 1931 break; 1932 fnvlist_add_uint64(suspended, fsname, 1933 (uintptr_t)cookie); 1934 } 1935 } 1936 1937 ddsa.ddsa_snaps = snaps; 1938 ddsa.ddsa_props = props; 1939 ddsa.ddsa_errors = errors; 1940 ddsa.ddsa_cr = CRED(); 1941 ddsa.ddsa_proc = curproc; 1942 1943 if (error == 0) { 1944 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1945 dsl_dataset_snapshot_sync, &ddsa, 1946 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1947 } 1948 1949 if (suspended != NULL) { 1950 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1951 pair = nvlist_next_nvpair(suspended, pair)) { 1952 zil_resume((void *)(uintptr_t) 1953 fnvpair_value_uint64(pair)); 1954 } 1955 fnvlist_free(suspended); 1956 } 1957 1958 if (error == 0) { 1959 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1960 pair = nvlist_next_nvpair(snaps, pair)) { 1961 zvol_create_minor(nvpair_name(pair)); 1962 } 1963 } 1964 1965 return (error); 1966 } 1967 1968 typedef struct dsl_dataset_snapshot_tmp_arg { 1969 const char *ddsta_fsname; 1970 const char *ddsta_snapname; 1971 minor_t ddsta_cleanup_minor; 1972 const char *ddsta_htag; 1973 } dsl_dataset_snapshot_tmp_arg_t; 1974 1975 static int 1976 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1977 { 1978 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1979 dsl_pool_t *dp = dmu_tx_pool(tx); 1980 dsl_dataset_t *ds; 1981 int error; 1982 1983 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1984 if (error != 0) 1985 return (error); 1986 1987 /* NULL cred means no limit check for tmp snapshot */ 1988 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1989 tx, B_FALSE, 0, NULL, NULL); 1990 if (error != 0) { 1991 dsl_dataset_rele(ds, FTAG); 1992 return (error); 1993 } 1994 1995 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1996 dsl_dataset_rele(ds, FTAG); 1997 return (SET_ERROR(ENOTSUP)); 1998 } 1999 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 2000 B_TRUE, tx); 2001 if (error != 0) { 2002 dsl_dataset_rele(ds, FTAG); 2003 return (error); 2004 } 2005 2006 dsl_dataset_rele(ds, FTAG); 2007 return (0); 2008 } 2009 2010 static void 2011 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 2012 { 2013 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 2014 dsl_pool_t *dp = dmu_tx_pool(tx); 2015 dsl_dataset_t *ds = NULL; 2016 2017 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 2018 2019 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 2020 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 2021 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 2022 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 2023 2024 dsl_dataset_rele(ds, FTAG); 2025 } 2026 2027 int 2028 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 2029 minor_t cleanup_minor, const char *htag) 2030 { 2031 dsl_dataset_snapshot_tmp_arg_t ddsta; 2032 int error; 2033 spa_t *spa; 2034 boolean_t needsuspend; 2035 void *cookie; 2036 2037 ddsta.ddsta_fsname = fsname; 2038 ddsta.ddsta_snapname = snapname; 2039 ddsta.ddsta_cleanup_minor = cleanup_minor; 2040 ddsta.ddsta_htag = htag; 2041 2042 error = spa_open(fsname, &spa, FTAG); 2043 if (error != 0) 2044 return (error); 2045 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 2046 spa_close(spa, FTAG); 2047 2048 if (needsuspend) { 2049 error = zil_suspend(fsname, &cookie); 2050 if (error != 0) 2051 return (error); 2052 } 2053 2054 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 2055 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 2056 2057 if (needsuspend) 2058 zil_resume(cookie); 2059 return (error); 2060 } 2061 2062 void 2063 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 2064 { 2065 ASSERT(dmu_tx_is_syncing(tx)); 2066 ASSERT(ds->ds_objset != NULL); 2067 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 2068 2069 /* 2070 * in case we had to change ds_fsid_guid when we opened it, 2071 * sync it out now. 2072 */ 2073 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2074 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 2075 2076 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 2077 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2078 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 2079 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 2080 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2081 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 2082 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 2083 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 2084 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 2085 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 2086 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 2087 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 2088 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 2089 } 2090 2091 dmu_objset_sync(ds->ds_objset, zio, tx); 2092 2093 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2094 if (zfeature_active(f, ds->ds_feature_activation[f])) { 2095 if (zfeature_active(f, ds->ds_feature[f])) 2096 continue; 2097 dsl_dataset_activate_feature(ds->ds_object, f, 2098 ds->ds_feature_activation[f], tx); 2099 ds->ds_feature[f] = ds->ds_feature_activation[f]; 2100 } 2101 } 2102 } 2103 2104 /* 2105 * Check if the percentage of blocks shared between the clone and the 2106 * snapshot (as opposed to those that are clone only) is below a certain 2107 * threshold 2108 */ 2109 static boolean_t 2110 dsl_livelist_should_disable(dsl_dataset_t *ds) 2111 { 2112 uint64_t used, referenced; 2113 int percent_shared; 2114 2115 used = dsl_dir_get_usedds(ds->ds_dir); 2116 referenced = dsl_get_referenced(ds); 2117 ASSERT3U(referenced, >=, 0); 2118 ASSERT3U(used, >=, 0); 2119 if (referenced == 0) 2120 return (B_FALSE); 2121 percent_shared = (100 * (referenced - used)) / referenced; 2122 if (percent_shared <= zfs_livelist_min_percent_shared) 2123 return (B_TRUE); 2124 return (B_FALSE); 2125 } 2126 2127 /* 2128 * Check if it is possible to combine two livelist entries into one. 2129 * This is the case if the combined number of 'live' blkptrs (ALLOCs that 2130 * don't have a matching FREE) is under the maximum sublist size. 2131 * We check this by subtracting twice the total number of frees from the total 2132 * number of blkptrs. FREEs are counted twice because each FREE blkptr 2133 * will cancel out an ALLOC blkptr when the livelist is processed. 2134 */ 2135 static boolean_t 2136 dsl_livelist_should_condense(dsl_deadlist_entry_t *first, 2137 dsl_deadlist_entry_t *next) 2138 { 2139 uint64_t total_free = first->dle_bpobj.bpo_phys->bpo_num_freed + 2140 next->dle_bpobj.bpo_phys->bpo_num_freed; 2141 uint64_t total_entries = first->dle_bpobj.bpo_phys->bpo_num_blkptrs + 2142 next->dle_bpobj.bpo_phys->bpo_num_blkptrs; 2143 if ((total_entries - (2 * total_free)) < zfs_livelist_max_entries) 2144 return (B_TRUE); 2145 return (B_FALSE); 2146 } 2147 2148 typedef struct try_condense_arg { 2149 spa_t *spa; 2150 dsl_dataset_t *ds; 2151 } try_condense_arg_t; 2152 2153 /* 2154 * Iterate over the livelist entries, searching for a pair to condense. 2155 * A nonzero return value means stop, 0 means keep looking. 2156 */ 2157 static int 2158 dsl_livelist_try_condense(void *arg, dsl_deadlist_entry_t *first) 2159 { 2160 try_condense_arg_t *tca = arg; 2161 spa_t *spa = tca->spa; 2162 dsl_dataset_t *ds = tca->ds; 2163 dsl_deadlist_t *ll = &ds->ds_dir->dd_livelist; 2164 dsl_deadlist_entry_t *next; 2165 2166 /* The condense thread has not yet been created at import */ 2167 if (spa->spa_livelist_condense_zthr == NULL) 2168 return (1); 2169 2170 /* A condense is already in progress */ 2171 if (spa->spa_to_condense.ds != NULL) 2172 return (1); 2173 2174 next = AVL_NEXT(&ll->dl_tree, &first->dle_node); 2175 /* The livelist has only one entry - don't condense it */ 2176 if (next == NULL) 2177 return (1); 2178 2179 /* Next is the newest entry - don't condense it */ 2180 if (AVL_NEXT(&ll->dl_tree, &next->dle_node) == NULL) 2181 return (1); 2182 2183 /* This pair is not ready to condense but keep looking */ 2184 if (!dsl_livelist_should_condense(first, next)) 2185 return (0); 2186 2187 /* 2188 * Add a ref to prevent the dataset from being evicted while 2189 * the condense zthr or synctask are running. Ref will be 2190 * released at the end of the condense synctask 2191 */ 2192 dmu_buf_add_ref(ds->ds_dbuf, spa); 2193 2194 spa->spa_to_condense.ds = ds; 2195 spa->spa_to_condense.first = first; 2196 spa->spa_to_condense.next = next; 2197 spa->spa_to_condense.syncing = B_FALSE; 2198 spa->spa_to_condense.cancelled = B_FALSE; 2199 2200 zthr_wakeup(spa->spa_livelist_condense_zthr); 2201 return (1); 2202 } 2203 2204 static void 2205 dsl_flush_pending_livelist(dsl_dataset_t *ds, dmu_tx_t *tx) 2206 { 2207 dsl_dir_t *dd = ds->ds_dir; 2208 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 2209 dsl_deadlist_entry_t *last = dsl_deadlist_last(&dd->dd_livelist); 2210 2211 /* Check if we need to add a new sub-livelist */ 2212 if (last == NULL) { 2213 /* The livelist is empty */ 2214 dsl_deadlist_add_key(&dd->dd_livelist, 2215 tx->tx_txg - 1, tx); 2216 } else if (spa_sync_pass(spa) == 1) { 2217 /* 2218 * Check if the newest entry is full. If it is, make a new one. 2219 * We only do this once per sync because we could overfill a 2220 * sublist in one sync pass and don't want to add another entry 2221 * for a txg that is already represented. This ensures that 2222 * blkptrs born in the same txg are stored in the same sublist. 2223 */ 2224 bpobj_t bpobj = last->dle_bpobj; 2225 uint64_t all = bpobj.bpo_phys->bpo_num_blkptrs; 2226 uint64_t free = bpobj.bpo_phys->bpo_num_freed; 2227 uint64_t alloc = all - free; 2228 if (alloc > zfs_livelist_max_entries) { 2229 dsl_deadlist_add_key(&dd->dd_livelist, 2230 tx->tx_txg - 1, tx); 2231 } 2232 } 2233 2234 /* Insert each entry into the on-disk livelist */ 2235 bplist_iterate(&dd->dd_pending_allocs, 2236 dsl_deadlist_insert_alloc_cb, &dd->dd_livelist, tx); 2237 bplist_iterate(&dd->dd_pending_frees, 2238 dsl_deadlist_insert_free_cb, &dd->dd_livelist, tx); 2239 2240 /* Attempt to condense every pair of adjacent entries */ 2241 try_condense_arg_t arg = { 2242 .spa = spa, 2243 .ds = ds 2244 }; 2245 dsl_deadlist_iterate(&dd->dd_livelist, dsl_livelist_try_condense, 2246 &arg); 2247 } 2248 2249 void 2250 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 2251 { 2252 objset_t *os = ds->ds_objset; 2253 2254 bplist_iterate(&ds->ds_pending_deadlist, 2255 dsl_deadlist_insert_alloc_cb, &ds->ds_deadlist, tx); 2256 2257 if (dsl_deadlist_is_open(&ds->ds_dir->dd_livelist)) { 2258 dsl_flush_pending_livelist(ds, tx); 2259 if (dsl_livelist_should_disable(ds)) { 2260 dsl_dir_remove_livelist(ds->ds_dir, tx, B_TRUE); 2261 } 2262 } 2263 2264 dsl_bookmark_sync_done(ds, tx); 2265 2266 multilist_destroy(&os->os_synced_dnodes); 2267 2268 if (os->os_encrypted) 2269 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2270 else 2271 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2272 2273 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2274 2275 dmu_buf_rele(ds->ds_dbuf, ds); 2276 } 2277 2278 int 2279 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2280 { 2281 uint64_t count = 0; 2282 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2283 zap_cursor_t zc; 2284 zap_attribute_t za; 2285 2286 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2287 2288 /* 2289 * There may be missing entries in ds_next_clones_obj 2290 * due to a bug in a previous version of the code. 2291 * Only trust it if it has the right number of entries. 2292 */ 2293 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2294 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2295 &count)); 2296 } 2297 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2298 return (SET_ERROR(ENOENT)); 2299 } 2300 for (zap_cursor_init(&zc, mos, 2301 dsl_dataset_phys(ds)->ds_next_clones_obj); 2302 zap_cursor_retrieve(&zc, &za) == 0; 2303 zap_cursor_advance(&zc)) { 2304 dsl_dataset_t *clone; 2305 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2306 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2307 za.za_first_integer, FTAG, &clone)); 2308 dsl_dir_name(clone->ds_dir, buf); 2309 fnvlist_add_boolean(val, buf); 2310 dsl_dataset_rele(clone, FTAG); 2311 } 2312 zap_cursor_fini(&zc); 2313 return (0); 2314 } 2315 2316 void 2317 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2318 { 2319 nvlist_t *propval = fnvlist_alloc(); 2320 nvlist_t *val = fnvlist_alloc(); 2321 2322 if (get_clones_stat_impl(ds, val) == 0) { 2323 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2324 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2325 propval); 2326 } 2327 2328 nvlist_free(val); 2329 nvlist_free(propval); 2330 } 2331 2332 static char * 2333 get_receive_resume_token_impl(dsl_dataset_t *ds) 2334 { 2335 if (!dsl_dataset_has_resume_receive_state(ds)) 2336 return (NULL); 2337 2338 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2339 char *str; 2340 void *packed; 2341 uint8_t *compressed; 2342 uint64_t val; 2343 nvlist_t *token_nv = fnvlist_alloc(); 2344 size_t packed_size, compressed_size; 2345 2346 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2347 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2348 fnvlist_add_uint64(token_nv, "fromguid", val); 2349 } 2350 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2351 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2352 fnvlist_add_uint64(token_nv, "object", val); 2353 } 2354 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2355 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2356 fnvlist_add_uint64(token_nv, "offset", val); 2357 } 2358 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2359 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2360 fnvlist_add_uint64(token_nv, "bytes", val); 2361 } 2362 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2363 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2364 fnvlist_add_uint64(token_nv, "toguid", val); 2365 } 2366 char buf[MAXNAMELEN]; 2367 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2368 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2369 fnvlist_add_string(token_nv, "toname", buf); 2370 } 2371 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2372 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2373 fnvlist_add_boolean(token_nv, "largeblockok"); 2374 } 2375 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2376 DS_FIELD_RESUME_EMBEDOK) == 0) { 2377 fnvlist_add_boolean(token_nv, "embedok"); 2378 } 2379 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2380 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2381 fnvlist_add_boolean(token_nv, "compressok"); 2382 } 2383 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2384 DS_FIELD_RESUME_RAWOK) == 0) { 2385 fnvlist_add_boolean(token_nv, "rawok"); 2386 } 2387 if (dsl_dataset_feature_is_active(ds, 2388 SPA_FEATURE_REDACTED_DATASETS)) { 2389 uint64_t num_redact_snaps = 0; 2390 uint64_t *redact_snaps = NULL; 2391 VERIFY3B(dsl_dataset_get_uint64_array_feature(ds, 2392 SPA_FEATURE_REDACTED_DATASETS, &num_redact_snaps, 2393 &redact_snaps), ==, B_TRUE); 2394 fnvlist_add_uint64_array(token_nv, "redact_snaps", 2395 redact_snaps, num_redact_snaps); 2396 } 2397 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2398 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS) == 0) { 2399 uint64_t num_redact_snaps = 0, int_size = 0; 2400 uint64_t *redact_snaps = NULL; 2401 VERIFY0(zap_length(dp->dp_meta_objset, ds->ds_object, 2402 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, &int_size, 2403 &num_redact_snaps)); 2404 ASSERT3U(int_size, ==, sizeof (uint64_t)); 2405 2406 redact_snaps = kmem_alloc(int_size * num_redact_snaps, 2407 KM_SLEEP); 2408 VERIFY0(zap_lookup(dp->dp_meta_objset, ds->ds_object, 2409 DS_FIELD_RESUME_REDACT_BOOKMARK_SNAPS, int_size, 2410 num_redact_snaps, redact_snaps)); 2411 fnvlist_add_uint64_array(token_nv, "book_redact_snaps", 2412 redact_snaps, num_redact_snaps); 2413 kmem_free(redact_snaps, int_size * num_redact_snaps); 2414 } 2415 packed = fnvlist_pack(token_nv, &packed_size); 2416 fnvlist_free(token_nv); 2417 compressed = kmem_alloc(packed_size, KM_SLEEP); 2418 2419 compressed_size = gzip_compress(packed, compressed, 2420 packed_size, packed_size, 6); 2421 2422 zio_cksum_t cksum; 2423 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2424 2425 size_t alloc_size = compressed_size * 2 + 1; 2426 str = kmem_alloc(alloc_size, KM_SLEEP); 2427 for (int i = 0; i < compressed_size; i++) { 2428 size_t offset = i * 2; 2429 (void) snprintf(str + offset, alloc_size - offset, 2430 "%02x", compressed[i]); 2431 } 2432 str[compressed_size * 2] = '\0'; 2433 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2434 ZFS_SEND_RESUME_TOKEN_VERSION, 2435 (longlong_t)cksum.zc_word[0], 2436 (longlong_t)packed_size, str); 2437 kmem_free(packed, packed_size); 2438 kmem_free(str, alloc_size); 2439 kmem_free(compressed, packed_size); 2440 return (propval); 2441 } 2442 2443 /* 2444 * Returns a string that represents the receive resume state token. It should 2445 * be freed with strfree(). NULL is returned if no resume state is present. 2446 */ 2447 char * 2448 get_receive_resume_token(dsl_dataset_t *ds) 2449 { 2450 /* 2451 * A failed "newfs" (e.g. full) resumable receive leaves 2452 * the stats set on this dataset. Check here for the prop. 2453 */ 2454 char *token = get_receive_resume_token_impl(ds); 2455 if (token != NULL) 2456 return (token); 2457 /* 2458 * A failed incremental resumable receive leaves the 2459 * stats set on our child named "%recv". Check the child 2460 * for the prop. 2461 */ 2462 /* 6 extra bytes for /%recv */ 2463 char name[ZFS_MAX_DATASET_NAME_LEN + 6]; 2464 dsl_dataset_t *recv_ds; 2465 dsl_dataset_name(ds, name); 2466 if (strlcat(name, "/", sizeof (name)) < sizeof (name) && 2467 strlcat(name, recv_clone_name, sizeof (name)) < sizeof (name) && 2468 dsl_dataset_hold(ds->ds_dir->dd_pool, name, FTAG, &recv_ds) == 0) { 2469 token = get_receive_resume_token_impl(recv_ds); 2470 dsl_dataset_rele(recv_ds, FTAG); 2471 } 2472 return (token); 2473 } 2474 2475 uint64_t 2476 dsl_get_refratio(dsl_dataset_t *ds) 2477 { 2478 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2479 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2480 dsl_dataset_phys(ds)->ds_compressed_bytes); 2481 return (ratio); 2482 } 2483 2484 uint64_t 2485 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2486 { 2487 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2488 } 2489 2490 uint64_t 2491 dsl_get_compressratio(dsl_dataset_t *ds) 2492 { 2493 if (ds->ds_is_snapshot) { 2494 return (dsl_get_refratio(ds)); 2495 } else { 2496 dsl_dir_t *dd = ds->ds_dir; 2497 mutex_enter(&dd->dd_lock); 2498 uint64_t val = dsl_dir_get_compressratio(dd); 2499 mutex_exit(&dd->dd_lock); 2500 return (val); 2501 } 2502 } 2503 2504 uint64_t 2505 dsl_get_used(dsl_dataset_t *ds) 2506 { 2507 if (ds->ds_is_snapshot) { 2508 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2509 } else { 2510 dsl_dir_t *dd = ds->ds_dir; 2511 mutex_enter(&dd->dd_lock); 2512 uint64_t val = dsl_dir_get_used(dd); 2513 mutex_exit(&dd->dd_lock); 2514 return (val); 2515 } 2516 } 2517 2518 uint64_t 2519 dsl_get_creation(dsl_dataset_t *ds) 2520 { 2521 return (dsl_dataset_phys(ds)->ds_creation_time); 2522 } 2523 2524 uint64_t 2525 dsl_get_creationtxg(dsl_dataset_t *ds) 2526 { 2527 return (dsl_dataset_phys(ds)->ds_creation_txg); 2528 } 2529 2530 uint64_t 2531 dsl_get_refquota(dsl_dataset_t *ds) 2532 { 2533 return (ds->ds_quota); 2534 } 2535 2536 uint64_t 2537 dsl_get_refreservation(dsl_dataset_t *ds) 2538 { 2539 return (ds->ds_reserved); 2540 } 2541 2542 uint64_t 2543 dsl_get_guid(dsl_dataset_t *ds) 2544 { 2545 return (dsl_dataset_phys(ds)->ds_guid); 2546 } 2547 2548 uint64_t 2549 dsl_get_unique(dsl_dataset_t *ds) 2550 { 2551 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2552 } 2553 2554 uint64_t 2555 dsl_get_objsetid(dsl_dataset_t *ds) 2556 { 2557 return (ds->ds_object); 2558 } 2559 2560 uint64_t 2561 dsl_get_userrefs(dsl_dataset_t *ds) 2562 { 2563 return (ds->ds_userrefs); 2564 } 2565 2566 uint64_t 2567 dsl_get_defer_destroy(dsl_dataset_t *ds) 2568 { 2569 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2570 } 2571 2572 uint64_t 2573 dsl_get_referenced(dsl_dataset_t *ds) 2574 { 2575 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2576 } 2577 2578 uint64_t 2579 dsl_get_numclones(dsl_dataset_t *ds) 2580 { 2581 ASSERT(ds->ds_is_snapshot); 2582 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2583 } 2584 2585 uint64_t 2586 dsl_get_inconsistent(dsl_dataset_t *ds) 2587 { 2588 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2589 1 : 0); 2590 } 2591 2592 uint64_t 2593 dsl_get_redacted(dsl_dataset_t *ds) 2594 { 2595 return (dsl_dataset_feature_is_active(ds, 2596 SPA_FEATURE_REDACTED_DATASETS)); 2597 } 2598 2599 uint64_t 2600 dsl_get_available(dsl_dataset_t *ds) 2601 { 2602 uint64_t refdbytes = dsl_get_referenced(ds); 2603 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2604 NULL, 0, TRUE); 2605 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2606 availbytes += 2607 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2608 } 2609 if (ds->ds_quota != 0) { 2610 /* 2611 * Adjust available bytes according to refquota 2612 */ 2613 if (refdbytes < ds->ds_quota) { 2614 availbytes = MIN(availbytes, 2615 ds->ds_quota - refdbytes); 2616 } else { 2617 availbytes = 0; 2618 } 2619 } 2620 return (availbytes); 2621 } 2622 2623 int 2624 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2625 { 2626 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2627 dsl_dataset_t *prev; 2628 int err = dsl_dataset_hold_obj(dp, 2629 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2630 if (err == 0) { 2631 uint64_t comp, uncomp; 2632 err = dsl_dataset_space_written(prev, ds, written, 2633 &comp, &uncomp); 2634 dsl_dataset_rele(prev, FTAG); 2635 } 2636 return (err); 2637 } 2638 2639 /* 2640 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2641 */ 2642 int 2643 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2644 { 2645 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2646 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2647 dsl_dataset_name(ds->ds_prev, snap); 2648 return (0); 2649 } else { 2650 return (SET_ERROR(ENOENT)); 2651 } 2652 } 2653 2654 void 2655 dsl_get_redact_snaps(dsl_dataset_t *ds, nvlist_t *propval) 2656 { 2657 uint64_t nsnaps; 2658 uint64_t *snaps; 2659 if (dsl_dataset_get_uint64_array_feature(ds, 2660 SPA_FEATURE_REDACTED_DATASETS, &nsnaps, &snaps)) { 2661 fnvlist_add_uint64_array(propval, ZPROP_VALUE, snaps, 2662 nsnaps); 2663 } 2664 } 2665 2666 /* 2667 * Returns the mountpoint property and source for the given dataset in the value 2668 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2669 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2670 * Returns 0 on success and an error on failure. 2671 */ 2672 int 2673 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2674 char *source) 2675 { 2676 int error; 2677 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2678 2679 /* Retrieve the mountpoint value stored in the zap object */ 2680 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2681 ZAP_MAXVALUELEN, value, source); 2682 if (error != 0) { 2683 return (error); 2684 } 2685 2686 /* 2687 * Process the dsname and source to find the full mountpoint string. 2688 * Can be skipped for 'legacy' or 'none'. 2689 */ 2690 if (value[0] == '/') { 2691 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2692 char *root = buf; 2693 const char *relpath; 2694 2695 /* 2696 * If we inherit the mountpoint, even from a dataset 2697 * with a received value, the source will be the path of 2698 * the dataset we inherit from. If source is 2699 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2700 * inherited. 2701 */ 2702 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2703 relpath = ""; 2704 } else { 2705 ASSERT0(strncmp(dsname, source, strlen(source))); 2706 relpath = dsname + strlen(source); 2707 if (relpath[0] == '/') 2708 relpath++; 2709 } 2710 2711 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2712 2713 /* 2714 * Special case an alternate root of '/'. This will 2715 * avoid having multiple leading slashes in the 2716 * mountpoint path. 2717 */ 2718 if (strcmp(root, "/") == 0) 2719 root++; 2720 2721 /* 2722 * If the mountpoint is '/' then skip over this 2723 * if we are obtaining either an alternate root or 2724 * an inherited mountpoint. 2725 */ 2726 char *mnt = value; 2727 if (value[1] == '\0' && (root[0] != '\0' || 2728 relpath[0] != '\0')) 2729 mnt = value + 1; 2730 2731 if (relpath[0] == '\0') { 2732 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2733 root, mnt); 2734 } else { 2735 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2736 root, mnt, relpath[0] == '@' ? "" : "/", 2737 relpath); 2738 } 2739 kmem_free(buf, ZAP_MAXVALUELEN); 2740 } 2741 2742 return (0); 2743 } 2744 2745 void 2746 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2747 { 2748 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2749 2750 ASSERT(dsl_pool_config_held(dp)); 2751 2752 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2753 dsl_get_refratio(ds)); 2754 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2755 dsl_get_logicalreferenced(ds)); 2756 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2757 dsl_get_compressratio(ds)); 2758 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2759 dsl_get_used(ds)); 2760 2761 if (ds->ds_is_snapshot) { 2762 get_clones_stat(ds, nv); 2763 } else { 2764 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2765 if (dsl_get_prev_snap(ds, buf) == 0) 2766 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2767 buf); 2768 dsl_dir_stats(ds->ds_dir, nv); 2769 } 2770 2771 nvlist_t *propval = fnvlist_alloc(); 2772 dsl_get_redact_snaps(ds, propval); 2773 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_REDACT_SNAPS), 2774 propval); 2775 nvlist_free(propval); 2776 2777 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2778 dsl_get_available(ds)); 2779 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2780 dsl_get_referenced(ds)); 2781 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2782 dsl_get_creation(ds)); 2783 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2784 dsl_get_creationtxg(ds)); 2785 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2786 dsl_get_refquota(ds)); 2787 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2788 dsl_get_refreservation(ds)); 2789 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2790 dsl_get_guid(ds)); 2791 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2792 dsl_get_unique(ds)); 2793 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2794 dsl_get_objsetid(ds)); 2795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2796 dsl_get_userrefs(ds)); 2797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2798 dsl_get_defer_destroy(ds)); 2799 dsl_dataset_crypt_stats(ds, nv); 2800 2801 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2802 uint64_t written; 2803 if (dsl_get_written(ds, &written) == 0) { 2804 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2805 written); 2806 } 2807 } 2808 2809 if (!dsl_dataset_is_snapshot(ds)) { 2810 char *token = get_receive_resume_token(ds); 2811 if (token != NULL) { 2812 dsl_prop_nvlist_add_string(nv, 2813 ZFS_PROP_RECEIVE_RESUME_TOKEN, token); 2814 kmem_strfree(token); 2815 } 2816 } 2817 } 2818 2819 void 2820 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2821 { 2822 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2823 ASSERT(dsl_pool_config_held(dp)); 2824 2825 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2826 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2827 stat->dds_guid = dsl_get_guid(ds); 2828 stat->dds_redacted = dsl_get_redacted(ds); 2829 stat->dds_origin[0] = '\0'; 2830 if (ds->ds_is_snapshot) { 2831 stat->dds_is_snapshot = B_TRUE; 2832 stat->dds_num_clones = dsl_get_numclones(ds); 2833 } else { 2834 stat->dds_is_snapshot = B_FALSE; 2835 stat->dds_num_clones = 0; 2836 2837 if (dsl_dir_is_clone(ds->ds_dir)) { 2838 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2839 } 2840 } 2841 } 2842 2843 uint64_t 2844 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2845 { 2846 return (ds->ds_fsid_guid); 2847 } 2848 2849 void 2850 dsl_dataset_space(dsl_dataset_t *ds, 2851 uint64_t *refdbytesp, uint64_t *availbytesp, 2852 uint64_t *usedobjsp, uint64_t *availobjsp) 2853 { 2854 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2855 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2856 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2857 *availbytesp += 2858 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2859 if (ds->ds_quota != 0) { 2860 /* 2861 * Adjust available bytes according to refquota 2862 */ 2863 if (*refdbytesp < ds->ds_quota) 2864 *availbytesp = MIN(*availbytesp, 2865 ds->ds_quota - *refdbytesp); 2866 else 2867 *availbytesp = 0; 2868 } 2869 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2870 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2871 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2872 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2873 } 2874 2875 boolean_t 2876 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2877 { 2878 dsl_pool_t *dp __maybe_unused = ds->ds_dir->dd_pool; 2879 uint64_t birth; 2880 2881 ASSERT(dsl_pool_config_held(dp)); 2882 if (snap == NULL) 2883 return (B_FALSE); 2884 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2885 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2886 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2887 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2888 objset_t *os, *os_snap; 2889 /* 2890 * It may be that only the ZIL differs, because it was 2891 * reset in the head. Don't count that as being 2892 * modified. 2893 */ 2894 if (dmu_objset_from_ds(ds, &os) != 0) 2895 return (B_TRUE); 2896 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2897 return (B_TRUE); 2898 return (memcmp(&os->os_phys->os_meta_dnode, 2899 &os_snap->os_phys->os_meta_dnode, 2900 sizeof (os->os_phys->os_meta_dnode)) != 0); 2901 } 2902 return (B_FALSE); 2903 } 2904 2905 typedef struct dsl_dataset_rename_snapshot_arg { 2906 const char *ddrsa_fsname; 2907 const char *ddrsa_oldsnapname; 2908 const char *ddrsa_newsnapname; 2909 boolean_t ddrsa_recursive; 2910 dmu_tx_t *ddrsa_tx; 2911 } dsl_dataset_rename_snapshot_arg_t; 2912 2913 static int 2914 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2915 dsl_dataset_t *hds, void *arg) 2916 { 2917 (void) dp; 2918 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2919 int error; 2920 uint64_t val; 2921 2922 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2923 if (error != 0) { 2924 /* ignore nonexistent snapshots */ 2925 return (error == ENOENT ? 0 : error); 2926 } 2927 2928 /* new name should not exist */ 2929 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2930 if (error == 0) 2931 error = SET_ERROR(EEXIST); 2932 else if (error == ENOENT) 2933 error = 0; 2934 2935 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2936 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2937 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2938 error = SET_ERROR(ENAMETOOLONG); 2939 2940 return (error); 2941 } 2942 2943 static int 2944 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2945 { 2946 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2947 dsl_pool_t *dp = dmu_tx_pool(tx); 2948 dsl_dataset_t *hds; 2949 int error; 2950 2951 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2952 if (error != 0) 2953 return (error); 2954 2955 if (ddrsa->ddrsa_recursive) { 2956 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2957 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2958 DS_FIND_CHILDREN); 2959 } else { 2960 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2961 } 2962 dsl_dataset_rele(hds, FTAG); 2963 return (error); 2964 } 2965 2966 static int 2967 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2968 dsl_dataset_t *hds, void *arg) 2969 { 2970 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2971 dsl_dataset_t *ds; 2972 uint64_t val; 2973 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2974 int error; 2975 2976 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2977 ASSERT(error == 0 || error == ENOENT); 2978 if (error == ENOENT) { 2979 /* ignore nonexistent snapshots */ 2980 return (0); 2981 } 2982 2983 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2984 2985 /* log before we change the name */ 2986 spa_history_log_internal_ds(ds, "rename", tx, 2987 "-> @%s", ddrsa->ddrsa_newsnapname); 2988 2989 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2990 B_FALSE)); 2991 mutex_enter(&ds->ds_lock); 2992 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 2993 sizeof (ds->ds_snapname)); 2994 mutex_exit(&ds->ds_lock); 2995 VERIFY0(zap_add(dp->dp_meta_objset, 2996 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2997 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2998 zvol_rename_minors(dp->dp_spa, ddrsa->ddrsa_oldsnapname, 2999 ddrsa->ddrsa_newsnapname, B_TRUE); 3000 3001 dsl_dataset_rele(ds, FTAG); 3002 return (0); 3003 } 3004 3005 static void 3006 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 3007 { 3008 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 3009 dsl_pool_t *dp = dmu_tx_pool(tx); 3010 dsl_dataset_t *hds = NULL; 3011 3012 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 3013 ddrsa->ddrsa_tx = tx; 3014 if (ddrsa->ddrsa_recursive) { 3015 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 3016 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 3017 DS_FIND_CHILDREN)); 3018 } else { 3019 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 3020 } 3021 dsl_dataset_rele(hds, FTAG); 3022 } 3023 3024 int 3025 dsl_dataset_rename_snapshot(const char *fsname, 3026 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 3027 { 3028 dsl_dataset_rename_snapshot_arg_t ddrsa; 3029 3030 ddrsa.ddrsa_fsname = fsname; 3031 ddrsa.ddrsa_oldsnapname = oldsnapname; 3032 ddrsa.ddrsa_newsnapname = newsnapname; 3033 ddrsa.ddrsa_recursive = recursive; 3034 3035 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 3036 dsl_dataset_rename_snapshot_sync, &ddrsa, 3037 1, ZFS_SPACE_CHECK_RESERVED)); 3038 } 3039 3040 /* 3041 * If we're doing an ownership handoff, we need to make sure that there is 3042 * only one long hold on the dataset. We're not allowed to change anything here 3043 * so we don't permanently release the long hold or regular hold here. We want 3044 * to do this only when syncing to avoid the dataset unexpectedly going away 3045 * when we release the long hold. 3046 */ 3047 static int 3048 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 3049 { 3050 boolean_t held = B_FALSE; 3051 3052 if (!dmu_tx_is_syncing(tx)) 3053 return (0); 3054 3055 dsl_dir_t *dd = ds->ds_dir; 3056 mutex_enter(&dd->dd_activity_lock); 3057 uint64_t holds = zfs_refcount_count(&ds->ds_longholds) - 3058 (owner != NULL ? 1 : 0); 3059 /* 3060 * The value of dd_activity_waiters can chance as soon as we drop the 3061 * lock, but we're fine with that; new waiters coming in or old 3062 * waiters leaving doesn't cause problems, since we're going to cancel 3063 * waiters later anyway. The goal of this check is to verify that no 3064 * non-waiters have long-holds, and all new long-holds will be 3065 * prevented because we're holding the pool config as writer. 3066 */ 3067 if (holds != dd->dd_activity_waiters) 3068 held = B_TRUE; 3069 mutex_exit(&dd->dd_activity_lock); 3070 3071 if (held) 3072 return (SET_ERROR(EBUSY)); 3073 3074 return (0); 3075 } 3076 3077 int 3078 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 3079 { 3080 dsl_dataset_rollback_arg_t *ddra = arg; 3081 dsl_pool_t *dp = dmu_tx_pool(tx); 3082 dsl_dataset_t *ds; 3083 int64_t unused_refres_delta; 3084 int error; 3085 3086 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 3087 if (error != 0) 3088 return (error); 3089 3090 /* must not be a snapshot */ 3091 if (ds->ds_is_snapshot) { 3092 dsl_dataset_rele(ds, FTAG); 3093 return (SET_ERROR(EINVAL)); 3094 } 3095 3096 /* must have a most recent snapshot */ 3097 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 3098 dsl_dataset_rele(ds, FTAG); 3099 return (SET_ERROR(ESRCH)); 3100 } 3101 3102 /* 3103 * No rollback to a snapshot created in the current txg, because 3104 * the rollback may dirty the dataset and create blocks that are 3105 * not reachable from the rootbp while having a birth txg that 3106 * falls into the snapshot's range. 3107 */ 3108 if (dmu_tx_is_syncing(tx) && 3109 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 3110 dsl_dataset_rele(ds, FTAG); 3111 return (SET_ERROR(EAGAIN)); 3112 } 3113 3114 /* 3115 * If the expected target snapshot is specified, then check that 3116 * the latest snapshot is it. 3117 */ 3118 if (ddra->ddra_tosnap != NULL) { 3119 dsl_dataset_t *snapds; 3120 3121 /* Check if the target snapshot exists at all. */ 3122 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 3123 if (error != 0) { 3124 /* 3125 * ESRCH is used to signal that the target snapshot does 3126 * not exist, while ENOENT is used to report that 3127 * the rolled back dataset does not exist. 3128 * ESRCH is also used to cover other cases where the 3129 * target snapshot is not related to the dataset being 3130 * rolled back such as being in a different pool. 3131 */ 3132 if (error == ENOENT || error == EXDEV) 3133 error = SET_ERROR(ESRCH); 3134 dsl_dataset_rele(ds, FTAG); 3135 return (error); 3136 } 3137 ASSERT(snapds->ds_is_snapshot); 3138 3139 /* Check if the snapshot is the latest snapshot indeed. */ 3140 if (snapds != ds->ds_prev) { 3141 /* 3142 * Distinguish between the case where the only problem 3143 * is intervening snapshots (EEXIST) vs the snapshot 3144 * not being a valid target for rollback (ESRCH). 3145 */ 3146 if (snapds->ds_dir == ds->ds_dir || 3147 (dsl_dir_is_clone(ds->ds_dir) && 3148 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 3149 snapds->ds_object)) { 3150 error = SET_ERROR(EEXIST); 3151 } else { 3152 error = SET_ERROR(ESRCH); 3153 } 3154 dsl_dataset_rele(snapds, FTAG); 3155 dsl_dataset_rele(ds, FTAG); 3156 return (error); 3157 } 3158 dsl_dataset_rele(snapds, FTAG); 3159 } 3160 3161 /* must not have any bookmarks after the most recent snapshot */ 3162 if (dsl_bookmark_latest_txg(ds) > 3163 dsl_dataset_phys(ds)->ds_prev_snap_txg) { 3164 dsl_dataset_rele(ds, FTAG); 3165 return (SET_ERROR(EEXIST)); 3166 } 3167 3168 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 3169 if (error != 0) { 3170 dsl_dataset_rele(ds, FTAG); 3171 return (error); 3172 } 3173 3174 /* 3175 * Check if the snap we are rolling back to uses more than 3176 * the refquota. 3177 */ 3178 if (ds->ds_quota != 0 && 3179 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 3180 dsl_dataset_rele(ds, FTAG); 3181 return (SET_ERROR(EDQUOT)); 3182 } 3183 3184 /* 3185 * When we do the clone swap, we will temporarily use more space 3186 * due to the refreservation (the head will no longer have any 3187 * unique space, so the entire amount of the refreservation will need 3188 * to be free). We will immediately destroy the clone, freeing 3189 * this space, but the freeing happens over many txg's. 3190 */ 3191 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 3192 dsl_dataset_phys(ds)->ds_unique_bytes); 3193 3194 if (unused_refres_delta > 0 && 3195 unused_refres_delta > 3196 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 3197 dsl_dataset_rele(ds, FTAG); 3198 return (SET_ERROR(ENOSPC)); 3199 } 3200 3201 dsl_dataset_rele(ds, FTAG); 3202 return (0); 3203 } 3204 3205 void 3206 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 3207 { 3208 dsl_dataset_rollback_arg_t *ddra = arg; 3209 dsl_pool_t *dp = dmu_tx_pool(tx); 3210 dsl_dataset_t *ds, *clone; 3211 uint64_t cloneobj; 3212 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 3213 3214 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 3215 3216 dsl_dataset_name(ds->ds_prev, namebuf); 3217 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 3218 3219 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 3220 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 3221 3222 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 3223 3224 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 3225 dsl_dataset_zero_zil(ds, tx); 3226 3227 dsl_destroy_head_sync_impl(clone, tx); 3228 3229 dsl_dataset_rele(clone, FTAG); 3230 dsl_dataset_rele(ds, FTAG); 3231 } 3232 3233 /* 3234 * Rolls back the given filesystem or volume to the most recent snapshot. 3235 * The name of the most recent snapshot will be returned under key "target" 3236 * in the result nvlist. 3237 * 3238 * If owner != NULL: 3239 * - The existing dataset MUST be owned by the specified owner at entry 3240 * - Upon return, dataset will still be held by the same owner, whether we 3241 * succeed or not. 3242 * 3243 * This mode is required any time the existing filesystem is mounted. See 3244 * notes above zfs_suspend_fs() for further details. 3245 */ 3246 int 3247 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 3248 nvlist_t *result) 3249 { 3250 dsl_dataset_rollback_arg_t ddra; 3251 3252 ddra.ddra_fsname = fsname; 3253 ddra.ddra_tosnap = tosnap; 3254 ddra.ddra_owner = owner; 3255 ddra.ddra_result = result; 3256 3257 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3258 dsl_dataset_rollback_sync, &ddra, 3259 1, ZFS_SPACE_CHECK_RESERVED)); 3260 } 3261 3262 struct promotenode { 3263 list_node_t link; 3264 dsl_dataset_t *ds; 3265 }; 3266 3267 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3268 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3269 void *tag); 3270 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 3271 3272 int 3273 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3274 { 3275 dsl_dataset_promote_arg_t *ddpa = arg; 3276 dsl_pool_t *dp = dmu_tx_pool(tx); 3277 dsl_dataset_t *hds; 3278 struct promotenode *snap; 3279 dsl_dataset_t *origin_ds, *origin_head; 3280 int err; 3281 uint64_t unused; 3282 uint64_t ss_mv_cnt; 3283 size_t max_snap_len; 3284 boolean_t conflicting_snaps; 3285 3286 err = promote_hold(ddpa, dp, FTAG); 3287 if (err != 0) 3288 return (err); 3289 3290 hds = ddpa->ddpa_clone; 3291 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3292 3293 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3294 promote_rele(ddpa, FTAG); 3295 return (SET_ERROR(EXDEV)); 3296 } 3297 3298 snap = list_head(&ddpa->shared_snaps); 3299 origin_head = snap->ds; 3300 if (snap == NULL) { 3301 err = SET_ERROR(ENOENT); 3302 goto out; 3303 } 3304 origin_ds = snap->ds; 3305 3306 /* 3307 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3308 * When doing a promote we must make sure the encryption root for 3309 * both the target and the target's origin does not change to avoid 3310 * needing to rewrap encryption keys 3311 */ 3312 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3313 if (err != 0) 3314 goto out; 3315 3316 /* 3317 * Compute and check the amount of space to transfer. Since this is 3318 * so expensive, don't do the preliminary check. 3319 */ 3320 if (!dmu_tx_is_syncing(tx)) { 3321 promote_rele(ddpa, FTAG); 3322 return (0); 3323 } 3324 3325 /* compute origin's new unique space */ 3326 snap = list_tail(&ddpa->clone_snaps); 3327 ASSERT(snap != NULL); 3328 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3329 origin_ds->ds_object); 3330 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3331 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3332 &ddpa->unique, &unused, &unused); 3333 3334 /* 3335 * Walk the snapshots that we are moving 3336 * 3337 * Compute space to transfer. Consider the incremental changes 3338 * to used by each snapshot: 3339 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3340 * So each snapshot gave birth to: 3341 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3342 * So a sequence would look like: 3343 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3344 * Which simplifies to: 3345 * uN + kN + kN-1 + ... + k1 + k0 3346 * Note however, if we stop before we reach the ORIGIN we get: 3347 * uN + kN + kN-1 + ... + kM - uM-1 3348 */ 3349 conflicting_snaps = B_FALSE; 3350 ss_mv_cnt = 0; 3351 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3352 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3353 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3354 for (snap = list_head(&ddpa->shared_snaps); snap; 3355 snap = list_next(&ddpa->shared_snaps, snap)) { 3356 uint64_t val, dlused, dlcomp, dluncomp; 3357 dsl_dataset_t *ds = snap->ds; 3358 3359 ss_mv_cnt++; 3360 3361 /* 3362 * If there are long holds, we won't be able to evict 3363 * the objset. 3364 */ 3365 if (dsl_dataset_long_held(ds)) { 3366 err = SET_ERROR(EBUSY); 3367 goto out; 3368 } 3369 3370 /* Check that the snapshot name does not conflict */ 3371 VERIFY0(dsl_dataset_get_snapname(ds)); 3372 if (strlen(ds->ds_snapname) >= max_snap_len) { 3373 err = SET_ERROR(ENAMETOOLONG); 3374 goto out; 3375 } 3376 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3377 if (err == 0) { 3378 fnvlist_add_boolean(ddpa->err_ds, 3379 snap->ds->ds_snapname); 3380 conflicting_snaps = B_TRUE; 3381 } else if (err != ENOENT) { 3382 goto out; 3383 } 3384 3385 /* The very first snapshot does not have a deadlist */ 3386 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3387 continue; 3388 3389 dsl_deadlist_space(&ds->ds_deadlist, 3390 &dlused, &dlcomp, &dluncomp); 3391 ddpa->used += dlused; 3392 ddpa->comp += dlcomp; 3393 ddpa->uncomp += dluncomp; 3394 } 3395 3396 /* 3397 * Check that bookmarks that are being transferred don't have 3398 * name conflicts. 3399 */ 3400 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3401 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3402 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3403 dbn = AVL_NEXT(&origin_head->ds_bookmarks, dbn)) { 3404 if (strlen(dbn->dbn_name) >= max_snap_len) { 3405 err = SET_ERROR(ENAMETOOLONG); 3406 goto out; 3407 } 3408 zfs_bookmark_phys_t bm; 3409 err = dsl_bookmark_lookup_impl(ddpa->ddpa_clone, 3410 dbn->dbn_name, &bm); 3411 3412 if (err == 0) { 3413 fnvlist_add_boolean(ddpa->err_ds, dbn->dbn_name); 3414 conflicting_snaps = B_TRUE; 3415 } else if (err == ESRCH) { 3416 err = 0; 3417 } else if (err != 0) { 3418 goto out; 3419 } 3420 } 3421 3422 /* 3423 * In order to return the full list of conflicting snapshots, we check 3424 * whether there was a conflict after traversing all of them. 3425 */ 3426 if (conflicting_snaps) { 3427 err = SET_ERROR(EEXIST); 3428 goto out; 3429 } 3430 3431 /* 3432 * If we are a clone of a clone then we never reached ORIGIN, 3433 * so we need to subtract out the clone origin's used space. 3434 */ 3435 if (ddpa->origin_origin) { 3436 ddpa->used -= 3437 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3438 ddpa->comp -= 3439 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3440 ddpa->uncomp -= 3441 dsl_dataset_phys(ddpa->origin_origin)-> 3442 ds_uncompressed_bytes; 3443 } 3444 3445 /* Check that there is enough space and limit headroom here */ 3446 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3447 0, ss_mv_cnt, ddpa->used, ddpa->cr, ddpa->proc); 3448 if (err != 0) 3449 goto out; 3450 3451 /* 3452 * Compute the amounts of space that will be used by snapshots 3453 * after the promotion (for both origin and clone). For each, 3454 * it is the amount of space that will be on all of their 3455 * deadlists (that was not born before their new origin). 3456 */ 3457 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3458 uint64_t space; 3459 3460 /* 3461 * Note, typically this will not be a clone of a clone, 3462 * so dd_origin_txg will be < TXG_INITIAL, so 3463 * these snaplist_space() -> dsl_deadlist_space_range() 3464 * calls will be fast because they do not have to 3465 * iterate over all bps. 3466 */ 3467 snap = list_head(&ddpa->origin_snaps); 3468 if (snap == NULL) { 3469 err = SET_ERROR(ENOENT); 3470 goto out; 3471 } 3472 err = snaplist_space(&ddpa->shared_snaps, 3473 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3474 if (err != 0) 3475 goto out; 3476 3477 err = snaplist_space(&ddpa->clone_snaps, 3478 snap->ds->ds_dir->dd_origin_txg, &space); 3479 if (err != 0) 3480 goto out; 3481 ddpa->cloneusedsnap += space; 3482 } 3483 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3484 DD_FLAG_USED_BREAKDOWN) { 3485 err = snaplist_space(&ddpa->origin_snaps, 3486 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3487 &ddpa->originusedsnap); 3488 if (err != 0) 3489 goto out; 3490 } 3491 3492 out: 3493 promote_rele(ddpa, FTAG); 3494 return (err); 3495 } 3496 3497 void 3498 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3499 { 3500 dsl_dataset_promote_arg_t *ddpa = arg; 3501 dsl_pool_t *dp = dmu_tx_pool(tx); 3502 dsl_dataset_t *hds; 3503 struct promotenode *snap; 3504 dsl_dataset_t *origin_ds; 3505 dsl_dataset_t *origin_head; 3506 dsl_dir_t *dd; 3507 dsl_dir_t *odd = NULL; 3508 uint64_t oldnext_obj; 3509 int64_t delta; 3510 3511 ASSERT(nvlist_empty(ddpa->err_ds)); 3512 3513 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3514 hds = ddpa->ddpa_clone; 3515 3516 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3517 3518 snap = list_head(&ddpa->shared_snaps); 3519 origin_ds = snap->ds; 3520 dd = hds->ds_dir; 3521 3522 snap = list_head(&ddpa->origin_snaps); 3523 origin_head = snap->ds; 3524 3525 /* 3526 * We need to explicitly open odd, since origin_ds's dd will be 3527 * changing. 3528 */ 3529 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3530 NULL, FTAG, &odd)); 3531 3532 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3533 3534 /* change origin's next snap */ 3535 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3536 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3537 snap = list_tail(&ddpa->clone_snaps); 3538 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3539 origin_ds->ds_object); 3540 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3541 3542 /* change the origin's next clone */ 3543 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3544 dsl_dataset_remove_from_next_clones(origin_ds, 3545 snap->ds->ds_object, tx); 3546 VERIFY0(zap_add_int(dp->dp_meta_objset, 3547 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3548 oldnext_obj, tx)); 3549 } 3550 3551 /* change origin */ 3552 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3553 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3554 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3555 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3556 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3557 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3558 origin_head->ds_dir->dd_origin_txg = 3559 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3560 3561 /* change dd_clone entries */ 3562 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3563 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3564 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3565 VERIFY0(zap_add_int(dp->dp_meta_objset, 3566 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3567 hds->ds_object, tx)); 3568 3569 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3570 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3571 origin_head->ds_object, tx)); 3572 if (dsl_dir_phys(dd)->dd_clones == 0) { 3573 dsl_dir_phys(dd)->dd_clones = 3574 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3575 DMU_OT_NONE, 0, tx); 3576 } 3577 VERIFY0(zap_add_int(dp->dp_meta_objset, 3578 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3579 } 3580 3581 /* 3582 * Move bookmarks to this dir. 3583 */ 3584 dsl_bookmark_node_t *dbn_next; 3585 for (dsl_bookmark_node_t *dbn = avl_first(&origin_head->ds_bookmarks); 3586 dbn != NULL && dbn->dbn_phys.zbm_creation_txg <= 3587 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3588 dbn = dbn_next) { 3589 dbn_next = AVL_NEXT(&origin_head->ds_bookmarks, dbn); 3590 3591 avl_remove(&origin_head->ds_bookmarks, dbn); 3592 VERIFY0(zap_remove(dp->dp_meta_objset, 3593 origin_head->ds_bookmarks_obj, dbn->dbn_name, tx)); 3594 3595 dsl_bookmark_node_add(hds, dbn, tx); 3596 } 3597 3598 dsl_bookmark_next_changed(hds, origin_ds, tx); 3599 3600 /* move snapshots to this dir */ 3601 for (snap = list_head(&ddpa->shared_snaps); snap; 3602 snap = list_next(&ddpa->shared_snaps, snap)) { 3603 dsl_dataset_t *ds = snap->ds; 3604 3605 /* 3606 * Property callbacks are registered to a particular 3607 * dsl_dir. Since ours is changing, evict the objset 3608 * so that they will be unregistered from the old dsl_dir. 3609 */ 3610 if (ds->ds_objset) { 3611 dmu_objset_evict(ds->ds_objset); 3612 ds->ds_objset = NULL; 3613 } 3614 3615 /* move snap name entry */ 3616 VERIFY0(dsl_dataset_get_snapname(ds)); 3617 VERIFY0(dsl_dataset_snap_remove(origin_head, 3618 ds->ds_snapname, tx, B_TRUE)); 3619 VERIFY0(zap_add(dp->dp_meta_objset, 3620 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3621 8, 1, &ds->ds_object, tx)); 3622 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3623 DD_FIELD_SNAPSHOT_COUNT, tx); 3624 3625 /* change containing dsl_dir */ 3626 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3627 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3628 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3629 ASSERT3P(ds->ds_dir, ==, odd); 3630 dsl_dir_rele(ds->ds_dir, ds); 3631 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3632 NULL, ds, &ds->ds_dir)); 3633 3634 /* move any clone references */ 3635 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3636 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3637 zap_cursor_t zc; 3638 zap_attribute_t za; 3639 3640 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3641 dsl_dataset_phys(ds)->ds_next_clones_obj); 3642 zap_cursor_retrieve(&zc, &za) == 0; 3643 zap_cursor_advance(&zc)) { 3644 dsl_dataset_t *cnds; 3645 uint64_t o; 3646 3647 if (za.za_first_integer == oldnext_obj) { 3648 /* 3649 * We've already moved the 3650 * origin's reference. 3651 */ 3652 continue; 3653 } 3654 3655 VERIFY0(dsl_dataset_hold_obj(dp, 3656 za.za_first_integer, FTAG, &cnds)); 3657 o = dsl_dir_phys(cnds->ds_dir)-> 3658 dd_head_dataset_obj; 3659 3660 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3661 dsl_dir_phys(odd)->dd_clones, o, tx)); 3662 VERIFY0(zap_add_int(dp->dp_meta_objset, 3663 dsl_dir_phys(dd)->dd_clones, o, tx)); 3664 dsl_dataset_rele(cnds, FTAG); 3665 } 3666 zap_cursor_fini(&zc); 3667 } 3668 3669 ASSERT(!dsl_prop_hascb(ds)); 3670 } 3671 3672 /* 3673 * Change space accounting. 3674 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3675 * both be valid, or both be 0 (resulting in delta == 0). This 3676 * is true for each of {clone,origin} independently. 3677 */ 3678 3679 delta = ddpa->cloneusedsnap - 3680 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3681 ASSERT3S(delta, >=, 0); 3682 ASSERT3U(ddpa->used, >=, delta); 3683 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3684 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3685 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3686 3687 delta = ddpa->originusedsnap - 3688 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3689 ASSERT3S(delta, <=, 0); 3690 ASSERT3U(ddpa->used, >=, -delta); 3691 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3692 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3693 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3694 3695 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3696 3697 /* 3698 * Since livelists are specific to a clone's origin txg, they 3699 * are no longer accurate. Destroy the livelist from the clone being 3700 * promoted. If the origin dataset is a clone, destroy its livelist 3701 * as well. 3702 */ 3703 dsl_dir_remove_livelist(dd, tx, B_TRUE); 3704 dsl_dir_remove_livelist(odd, tx, B_TRUE); 3705 3706 /* log history record */ 3707 spa_history_log_internal_ds(hds, "promote", tx, " "); 3708 3709 dsl_dir_rele(odd, FTAG); 3710 promote_rele(ddpa, FTAG); 3711 } 3712 3713 /* 3714 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3715 * (exclusive) and last_obj (inclusive). The list will be in reverse 3716 * order (last_obj will be the list_head()). If first_obj == 0, do all 3717 * snapshots back to this dataset's origin. 3718 */ 3719 static int 3720 snaplist_make(dsl_pool_t *dp, 3721 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 3722 { 3723 uint64_t obj = last_obj; 3724 3725 list_create(l, sizeof (struct promotenode), 3726 offsetof(struct promotenode, link)); 3727 3728 while (obj != first_obj) { 3729 dsl_dataset_t *ds; 3730 struct promotenode *snap; 3731 int err; 3732 3733 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3734 ASSERT(err != ENOENT); 3735 if (err != 0) 3736 return (err); 3737 3738 if (first_obj == 0) 3739 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3740 3741 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3742 snap->ds = ds; 3743 list_insert_tail(l, snap); 3744 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3745 } 3746 3747 return (0); 3748 } 3749 3750 static int 3751 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3752 { 3753 struct promotenode *snap; 3754 3755 *spacep = 0; 3756 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3757 uint64_t used, comp, uncomp; 3758 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3759 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3760 *spacep += used; 3761 } 3762 return (0); 3763 } 3764 3765 static void 3766 snaplist_destroy(list_t *l, void *tag) 3767 { 3768 struct promotenode *snap; 3769 3770 if (l == NULL || !list_link_active(&l->list_head)) 3771 return; 3772 3773 while ((snap = list_tail(l)) != NULL) { 3774 list_remove(l, snap); 3775 dsl_dataset_rele(snap->ds, tag); 3776 kmem_free(snap, sizeof (*snap)); 3777 } 3778 list_destroy(l); 3779 } 3780 3781 static int 3782 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 3783 { 3784 int error; 3785 dsl_dir_t *dd; 3786 struct promotenode *snap; 3787 3788 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3789 &ddpa->ddpa_clone); 3790 if (error != 0) 3791 return (error); 3792 dd = ddpa->ddpa_clone->ds_dir; 3793 3794 if (ddpa->ddpa_clone->ds_is_snapshot || 3795 !dsl_dir_is_clone(dd)) { 3796 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3797 return (SET_ERROR(EINVAL)); 3798 } 3799 3800 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3801 &ddpa->shared_snaps, tag); 3802 if (error != 0) 3803 goto out; 3804 3805 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3806 &ddpa->clone_snaps, tag); 3807 if (error != 0) 3808 goto out; 3809 3810 snap = list_head(&ddpa->shared_snaps); 3811 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3812 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3813 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3814 &ddpa->origin_snaps, tag); 3815 if (error != 0) 3816 goto out; 3817 3818 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3819 error = dsl_dataset_hold_obj(dp, 3820 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3821 tag, &ddpa->origin_origin); 3822 if (error != 0) 3823 goto out; 3824 } 3825 out: 3826 if (error != 0) 3827 promote_rele(ddpa, tag); 3828 return (error); 3829 } 3830 3831 static void 3832 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 3833 { 3834 snaplist_destroy(&ddpa->shared_snaps, tag); 3835 snaplist_destroy(&ddpa->clone_snaps, tag); 3836 snaplist_destroy(&ddpa->origin_snaps, tag); 3837 if (ddpa->origin_origin != NULL) 3838 dsl_dataset_rele(ddpa->origin_origin, tag); 3839 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3840 } 3841 3842 /* 3843 * Promote a clone. 3844 * 3845 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3846 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3847 */ 3848 int 3849 dsl_dataset_promote(const char *name, char *conflsnap) 3850 { 3851 dsl_dataset_promote_arg_t ddpa = { 0 }; 3852 uint64_t numsnaps; 3853 int error; 3854 nvpair_t *snap_pair; 3855 objset_t *os; 3856 3857 /* 3858 * We will modify space proportional to the number of 3859 * snapshots. Compute numsnaps. 3860 */ 3861 error = dmu_objset_hold(name, FTAG, &os); 3862 if (error != 0) 3863 return (error); 3864 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3865 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3866 &numsnaps); 3867 dmu_objset_rele(os, FTAG); 3868 if (error != 0) 3869 return (error); 3870 3871 ddpa.ddpa_clonename = name; 3872 ddpa.err_ds = fnvlist_alloc(); 3873 ddpa.cr = CRED(); 3874 ddpa.proc = curproc; 3875 3876 error = dsl_sync_task(name, dsl_dataset_promote_check, 3877 dsl_dataset_promote_sync, &ddpa, 3878 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3879 3880 /* 3881 * Return the first conflicting snapshot found. 3882 */ 3883 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3884 if (snap_pair != NULL && conflsnap != NULL) 3885 (void) strlcpy(conflsnap, nvpair_name(snap_pair), 3886 ZFS_MAX_DATASET_NAME_LEN); 3887 3888 fnvlist_free(ddpa.err_ds); 3889 return (error); 3890 } 3891 3892 int 3893 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3894 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3895 { 3896 /* 3897 * "slack" factor for received datasets with refquota set on them. 3898 * See the bottom of this function for details on its use. 3899 */ 3900 uint64_t refquota_slack = (uint64_t)DMU_MAX_ACCESS * 3901 spa_asize_inflation; 3902 int64_t unused_refres_delta; 3903 3904 /* they should both be heads */ 3905 if (clone->ds_is_snapshot || 3906 origin_head->ds_is_snapshot) 3907 return (SET_ERROR(EINVAL)); 3908 3909 /* if we are not forcing, the branch point should be just before them */ 3910 if (!force && clone->ds_prev != origin_head->ds_prev) 3911 return (SET_ERROR(EINVAL)); 3912 3913 /* clone should be the clone (unless they are unrelated) */ 3914 if (clone->ds_prev != NULL && 3915 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3916 origin_head->ds_dir != clone->ds_prev->ds_dir) 3917 return (SET_ERROR(EINVAL)); 3918 3919 /* the clone should be a child of the origin */ 3920 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3921 return (SET_ERROR(EINVAL)); 3922 3923 /* origin_head shouldn't be modified unless 'force' */ 3924 if (!force && 3925 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3926 return (SET_ERROR(ETXTBSY)); 3927 3928 /* origin_head should have no long holds (e.g. is not mounted) */ 3929 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3930 return (SET_ERROR(EBUSY)); 3931 3932 /* check amount of any unconsumed refreservation */ 3933 unused_refres_delta = 3934 (int64_t)MIN(origin_head->ds_reserved, 3935 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3936 (int64_t)MIN(origin_head->ds_reserved, 3937 dsl_dataset_phys(clone)->ds_unique_bytes); 3938 3939 if (unused_refres_delta > 0 && 3940 unused_refres_delta > 3941 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3942 return (SET_ERROR(ENOSPC)); 3943 3944 /* 3945 * The clone can't be too much over the head's refquota. 3946 * 3947 * To ensure that the entire refquota can be used, we allow one 3948 * transaction to exceed the refquota. Therefore, this check 3949 * needs to also allow for the space referenced to be more than the 3950 * refquota. The maximum amount of space that one transaction can use 3951 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3952 * overage ensures that we are able to receive a filesystem that 3953 * exceeds the refquota on the source system. 3954 * 3955 * So that overage is the refquota_slack we use below. 3956 */ 3957 if (origin_head->ds_quota != 0 && 3958 dsl_dataset_phys(clone)->ds_referenced_bytes > 3959 origin_head->ds_quota + refquota_slack) 3960 return (SET_ERROR(EDQUOT)); 3961 3962 return (0); 3963 } 3964 3965 static void 3966 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3967 dsl_dataset_t *origin, dmu_tx_t *tx) 3968 { 3969 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 3970 dsl_pool_t *dp = dmu_tx_pool(tx); 3971 3972 ASSERT(dsl_pool_sync_context(dp)); 3973 3974 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 3975 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 3976 3977 if (clone_remap_dl_obj != 0) { 3978 dsl_deadlist_close(&clone->ds_remap_deadlist); 3979 dsl_dataset_unset_remap_deadlist_object(clone, tx); 3980 } 3981 if (origin_remap_dl_obj != 0) { 3982 dsl_deadlist_close(&origin->ds_remap_deadlist); 3983 dsl_dataset_unset_remap_deadlist_object(origin, tx); 3984 } 3985 3986 if (clone_remap_dl_obj != 0) { 3987 dsl_dataset_set_remap_deadlist_object(origin, 3988 clone_remap_dl_obj, tx); 3989 dsl_deadlist_open(&origin->ds_remap_deadlist, 3990 dp->dp_meta_objset, clone_remap_dl_obj); 3991 } 3992 if (origin_remap_dl_obj != 0) { 3993 dsl_dataset_set_remap_deadlist_object(clone, 3994 origin_remap_dl_obj, tx); 3995 dsl_deadlist_open(&clone->ds_remap_deadlist, 3996 dp->dp_meta_objset, origin_remap_dl_obj); 3997 } 3998 } 3999 4000 void 4001 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 4002 dsl_dataset_t *origin_head, dmu_tx_t *tx) 4003 { 4004 dsl_pool_t *dp = dmu_tx_pool(tx); 4005 int64_t unused_refres_delta; 4006 4007 ASSERT(clone->ds_reserved == 0); 4008 /* 4009 * NOTE: On DEBUG kernels there could be a race between this and 4010 * the check function if spa_asize_inflation is adjusted... 4011 */ 4012 ASSERT(origin_head->ds_quota == 0 || 4013 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 4014 DMU_MAX_ACCESS * spa_asize_inflation); 4015 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 4016 4017 dsl_dir_cancel_waiters(origin_head->ds_dir); 4018 4019 /* 4020 * Swap per-dataset feature flags. 4021 */ 4022 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 4023 if (!(spa_feature_table[f].fi_flags & 4024 ZFEATURE_FLAG_PER_DATASET)) { 4025 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 4026 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 4027 continue; 4028 } 4029 4030 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 4031 void *clone_feature = clone->ds_feature[f]; 4032 boolean_t origin_head_inuse = 4033 dsl_dataset_feature_is_active(origin_head, f); 4034 void *origin_head_feature = origin_head->ds_feature[f]; 4035 4036 if (clone_inuse) 4037 dsl_dataset_deactivate_feature_impl(clone, f, tx); 4038 if (origin_head_inuse) 4039 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 4040 4041 if (clone_inuse) { 4042 dsl_dataset_activate_feature(origin_head->ds_object, f, 4043 clone_feature, tx); 4044 origin_head->ds_feature[f] = clone_feature; 4045 } 4046 if (origin_head_inuse) { 4047 dsl_dataset_activate_feature(clone->ds_object, f, 4048 origin_head_feature, tx); 4049 clone->ds_feature[f] = origin_head_feature; 4050 } 4051 } 4052 4053 dmu_buf_will_dirty(clone->ds_dbuf, tx); 4054 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 4055 4056 if (clone->ds_objset != NULL) { 4057 dmu_objset_evict(clone->ds_objset); 4058 clone->ds_objset = NULL; 4059 } 4060 4061 if (origin_head->ds_objset != NULL) { 4062 dmu_objset_evict(origin_head->ds_objset); 4063 origin_head->ds_objset = NULL; 4064 } 4065 4066 unused_refres_delta = 4067 (int64_t)MIN(origin_head->ds_reserved, 4068 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 4069 (int64_t)MIN(origin_head->ds_reserved, 4070 dsl_dataset_phys(clone)->ds_unique_bytes); 4071 4072 /* 4073 * Reset origin's unique bytes. 4074 */ 4075 { 4076 dsl_dataset_t *origin = clone->ds_prev; 4077 uint64_t comp, uncomp; 4078 4079 dmu_buf_will_dirty(origin->ds_dbuf, tx); 4080 dsl_deadlist_space_range(&clone->ds_deadlist, 4081 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 4082 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 4083 } 4084 4085 /* swap blkptrs */ 4086 { 4087 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 4088 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 4089 blkptr_t tmp; 4090 tmp = dsl_dataset_phys(origin_head)->ds_bp; 4091 dsl_dataset_phys(origin_head)->ds_bp = 4092 dsl_dataset_phys(clone)->ds_bp; 4093 dsl_dataset_phys(clone)->ds_bp = tmp; 4094 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 4095 rrw_exit(&clone->ds_bp_rwlock, FTAG); 4096 } 4097 4098 /* set dd_*_bytes */ 4099 { 4100 int64_t dused, dcomp, duncomp; 4101 uint64_t cdl_used, cdl_comp, cdl_uncomp; 4102 uint64_t odl_used, odl_comp, odl_uncomp; 4103 4104 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 4105 dd_used_breakdown[DD_USED_SNAP], ==, 0); 4106 4107 dsl_deadlist_space(&clone->ds_deadlist, 4108 &cdl_used, &cdl_comp, &cdl_uncomp); 4109 dsl_deadlist_space(&origin_head->ds_deadlist, 4110 &odl_used, &odl_comp, &odl_uncomp); 4111 4112 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 4113 cdl_used - 4114 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 4115 odl_used); 4116 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 4117 cdl_comp - 4118 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 4119 odl_comp); 4120 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 4121 cdl_uncomp - 4122 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 4123 odl_uncomp); 4124 4125 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 4126 dused, dcomp, duncomp, tx); 4127 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 4128 -dused, -dcomp, -duncomp, tx); 4129 4130 /* 4131 * The difference in the space used by snapshots is the 4132 * difference in snapshot space due to the head's 4133 * deadlist (since that's the only thing that's 4134 * changing that affects the snapused). 4135 */ 4136 dsl_deadlist_space_range(&clone->ds_deadlist, 4137 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4138 &cdl_used, &cdl_comp, &cdl_uncomp); 4139 dsl_deadlist_space_range(&origin_head->ds_deadlist, 4140 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 4141 &odl_used, &odl_comp, &odl_uncomp); 4142 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 4143 DD_USED_HEAD, DD_USED_SNAP, tx); 4144 } 4145 4146 /* swap ds_*_bytes */ 4147 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 4148 dsl_dataset_phys(clone)->ds_referenced_bytes); 4149 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 4150 dsl_dataset_phys(clone)->ds_compressed_bytes); 4151 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 4152 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 4153 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 4154 dsl_dataset_phys(clone)->ds_unique_bytes); 4155 4156 /* apply any parent delta for change in unconsumed refreservation */ 4157 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 4158 unused_refres_delta, 0, 0, tx); 4159 4160 /* 4161 * Swap deadlists. 4162 */ 4163 dsl_deadlist_close(&clone->ds_deadlist); 4164 dsl_deadlist_close(&origin_head->ds_deadlist); 4165 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 4166 dsl_dataset_phys(clone)->ds_deadlist_obj); 4167 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 4168 dsl_dataset_phys(clone)->ds_deadlist_obj); 4169 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 4170 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 4171 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 4172 4173 /* 4174 * If there is a bookmark at the origin, its "next dataset" is 4175 * changing, so we need to reset its FBN. 4176 */ 4177 dsl_bookmark_next_changed(origin_head, origin_head->ds_prev, tx); 4178 4179 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 4180 4181 /* 4182 * Destroy any livelists associated with the clone or the origin, 4183 * since after the swap the corresponding livelists are no longer 4184 * valid. 4185 */ 4186 dsl_dir_remove_livelist(clone->ds_dir, tx, B_TRUE); 4187 dsl_dir_remove_livelist(origin_head->ds_dir, tx, B_TRUE); 4188 4189 spa_history_log_internal_ds(clone, "clone swap", tx, 4190 "parent=%s", origin_head->ds_dir->dd_myname); 4191 } 4192 4193 /* 4194 * Given a pool name and a dataset object number in that pool, 4195 * return the name of that dataset. 4196 */ 4197 int 4198 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 4199 { 4200 dsl_pool_t *dp; 4201 dsl_dataset_t *ds; 4202 int error; 4203 4204 error = dsl_pool_hold(pname, FTAG, &dp); 4205 if (error != 0) 4206 return (error); 4207 4208 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 4209 if (error == 0) { 4210 dsl_dataset_name(ds, buf); 4211 dsl_dataset_rele(ds, FTAG); 4212 } 4213 dsl_pool_rele(dp, FTAG); 4214 4215 return (error); 4216 } 4217 4218 int 4219 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 4220 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 4221 { 4222 int error = 0; 4223 4224 ASSERT3S(asize, >, 0); 4225 4226 /* 4227 * *ref_rsrv is the portion of asize that will come from any 4228 * unconsumed refreservation space. 4229 */ 4230 *ref_rsrv = 0; 4231 4232 mutex_enter(&ds->ds_lock); 4233 /* 4234 * Make a space adjustment for reserved bytes. 4235 */ 4236 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 4237 ASSERT3U(*used, >=, 4238 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4239 *used -= 4240 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 4241 *ref_rsrv = 4242 asize - MIN(asize, parent_delta(ds, asize + inflight)); 4243 } 4244 4245 if (!check_quota || ds->ds_quota == 0) { 4246 mutex_exit(&ds->ds_lock); 4247 return (0); 4248 } 4249 /* 4250 * If they are requesting more space, and our current estimate 4251 * is over quota, they get to try again unless the actual 4252 * on-disk is over quota and there are no pending changes (which 4253 * may free up space for us). 4254 */ 4255 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 4256 ds->ds_quota) { 4257 if (inflight > 0 || 4258 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 4259 error = SET_ERROR(ERESTART); 4260 else 4261 error = SET_ERROR(EDQUOT); 4262 } 4263 mutex_exit(&ds->ds_lock); 4264 4265 return (error); 4266 } 4267 4268 typedef struct dsl_dataset_set_qr_arg { 4269 const char *ddsqra_name; 4270 zprop_source_t ddsqra_source; 4271 uint64_t ddsqra_value; 4272 } dsl_dataset_set_qr_arg_t; 4273 4274 4275 static int 4276 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 4277 { 4278 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4279 dsl_pool_t *dp = dmu_tx_pool(tx); 4280 dsl_dataset_t *ds; 4281 int error; 4282 uint64_t newval; 4283 4284 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 4285 return (SET_ERROR(ENOTSUP)); 4286 4287 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4288 if (error != 0) 4289 return (error); 4290 4291 if (ds->ds_is_snapshot) { 4292 dsl_dataset_rele(ds, FTAG); 4293 return (SET_ERROR(EINVAL)); 4294 } 4295 4296 error = dsl_prop_predict(ds->ds_dir, 4297 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4298 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4299 if (error != 0) { 4300 dsl_dataset_rele(ds, FTAG); 4301 return (error); 4302 } 4303 4304 if (newval == 0) { 4305 dsl_dataset_rele(ds, FTAG); 4306 return (0); 4307 } 4308 4309 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 4310 newval < ds->ds_reserved) { 4311 dsl_dataset_rele(ds, FTAG); 4312 return (SET_ERROR(ENOSPC)); 4313 } 4314 4315 dsl_dataset_rele(ds, FTAG); 4316 return (0); 4317 } 4318 4319 static void 4320 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 4321 { 4322 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4323 dsl_pool_t *dp = dmu_tx_pool(tx); 4324 dsl_dataset_t *ds = NULL; 4325 uint64_t newval; 4326 4327 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4328 4329 dsl_prop_set_sync_impl(ds, 4330 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4331 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4332 &ddsqra->ddsqra_value, tx); 4333 4334 VERIFY0(dsl_prop_get_int_ds(ds, 4335 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4336 4337 if (ds->ds_quota != newval) { 4338 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4339 ds->ds_quota = newval; 4340 } 4341 dsl_dataset_rele(ds, FTAG); 4342 } 4343 4344 int 4345 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4346 uint64_t refquota) 4347 { 4348 dsl_dataset_set_qr_arg_t ddsqra; 4349 4350 ddsqra.ddsqra_name = dsname; 4351 ddsqra.ddsqra_source = source; 4352 ddsqra.ddsqra_value = refquota; 4353 4354 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4355 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4356 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4357 } 4358 4359 static int 4360 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4361 { 4362 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4363 dsl_pool_t *dp = dmu_tx_pool(tx); 4364 dsl_dataset_t *ds; 4365 int error; 4366 uint64_t newval, unique; 4367 4368 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4369 return (SET_ERROR(ENOTSUP)); 4370 4371 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4372 if (error != 0) 4373 return (error); 4374 4375 if (ds->ds_is_snapshot) { 4376 dsl_dataset_rele(ds, FTAG); 4377 return (SET_ERROR(EINVAL)); 4378 } 4379 4380 error = dsl_prop_predict(ds->ds_dir, 4381 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4382 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4383 if (error != 0) { 4384 dsl_dataset_rele(ds, FTAG); 4385 return (error); 4386 } 4387 4388 /* 4389 * If we are doing the preliminary check in open context, the 4390 * space estimates may be inaccurate. 4391 */ 4392 if (!dmu_tx_is_syncing(tx)) { 4393 dsl_dataset_rele(ds, FTAG); 4394 return (0); 4395 } 4396 4397 mutex_enter(&ds->ds_lock); 4398 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4399 dsl_dataset_recalc_head_uniq(ds); 4400 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4401 mutex_exit(&ds->ds_lock); 4402 4403 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4404 uint64_t delta = MAX(unique, newval) - 4405 MAX(unique, ds->ds_reserved); 4406 4407 if (delta > 4408 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4409 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4410 dsl_dataset_rele(ds, FTAG); 4411 return (SET_ERROR(ENOSPC)); 4412 } 4413 } 4414 4415 dsl_dataset_rele(ds, FTAG); 4416 return (0); 4417 } 4418 4419 void 4420 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4421 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4422 { 4423 uint64_t newval; 4424 uint64_t unique; 4425 int64_t delta; 4426 4427 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4428 source, sizeof (value), 1, &value, tx); 4429 4430 VERIFY0(dsl_prop_get_int_ds(ds, 4431 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4432 4433 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4434 mutex_enter(&ds->ds_dir->dd_lock); 4435 mutex_enter(&ds->ds_lock); 4436 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4437 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4438 delta = MAX(0, (int64_t)(newval - unique)) - 4439 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4440 ds->ds_reserved = newval; 4441 mutex_exit(&ds->ds_lock); 4442 4443 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4444 mutex_exit(&ds->ds_dir->dd_lock); 4445 } 4446 4447 static void 4448 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4449 { 4450 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4451 dsl_pool_t *dp = dmu_tx_pool(tx); 4452 dsl_dataset_t *ds = NULL; 4453 4454 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4455 dsl_dataset_set_refreservation_sync_impl(ds, 4456 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4457 dsl_dataset_rele(ds, FTAG); 4458 } 4459 4460 int 4461 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4462 uint64_t refreservation) 4463 { 4464 dsl_dataset_set_qr_arg_t ddsqra; 4465 4466 ddsqra.ddsqra_name = dsname; 4467 ddsqra.ddsqra_source = source; 4468 ddsqra.ddsqra_value = refreservation; 4469 4470 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4471 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4472 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4473 } 4474 4475 typedef struct dsl_dataset_set_compression_arg { 4476 const char *ddsca_name; 4477 zprop_source_t ddsca_source; 4478 uint64_t ddsca_value; 4479 } dsl_dataset_set_compression_arg_t; 4480 4481 static int 4482 dsl_dataset_set_compression_check(void *arg, dmu_tx_t *tx) 4483 { 4484 dsl_dataset_set_compression_arg_t *ddsca = arg; 4485 dsl_pool_t *dp = dmu_tx_pool(tx); 4486 4487 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4488 spa_feature_t f = zio_compress_to_feature(compval); 4489 4490 if (f == SPA_FEATURE_NONE) 4491 return (SET_ERROR(EINVAL)); 4492 4493 if (!spa_feature_is_enabled(dp->dp_spa, f)) 4494 return (SET_ERROR(ENOTSUP)); 4495 4496 return (0); 4497 } 4498 4499 static void 4500 dsl_dataset_set_compression_sync(void *arg, dmu_tx_t *tx) 4501 { 4502 dsl_dataset_set_compression_arg_t *ddsca = arg; 4503 dsl_pool_t *dp = dmu_tx_pool(tx); 4504 dsl_dataset_t *ds = NULL; 4505 4506 uint64_t compval = ZIO_COMPRESS_ALGO(ddsca->ddsca_value); 4507 spa_feature_t f = zio_compress_to_feature(compval); 4508 ASSERT3S(spa_feature_table[f].fi_type, ==, ZFEATURE_TYPE_BOOLEAN); 4509 4510 VERIFY0(dsl_dataset_hold(dp, ddsca->ddsca_name, FTAG, &ds)); 4511 if (zfeature_active(f, ds->ds_feature[f]) != B_TRUE) { 4512 ds->ds_feature_activation[f] = (void *)B_TRUE; 4513 dsl_dataset_activate_feature(ds->ds_object, f, 4514 ds->ds_feature_activation[f], tx); 4515 ds->ds_feature[f] = ds->ds_feature_activation[f]; 4516 } 4517 dsl_dataset_rele(ds, FTAG); 4518 } 4519 4520 int 4521 dsl_dataset_set_compression(const char *dsname, zprop_source_t source, 4522 uint64_t compression) 4523 { 4524 dsl_dataset_set_compression_arg_t ddsca; 4525 4526 /* 4527 * The sync task is only required for zstd in order to activate 4528 * the feature flag when the property is first set. 4529 */ 4530 if (ZIO_COMPRESS_ALGO(compression) != ZIO_COMPRESS_ZSTD) 4531 return (0); 4532 4533 ddsca.ddsca_name = dsname; 4534 ddsca.ddsca_source = source; 4535 ddsca.ddsca_value = compression; 4536 4537 return (dsl_sync_task(dsname, dsl_dataset_set_compression_check, 4538 dsl_dataset_set_compression_sync, &ddsca, 0, 4539 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4540 } 4541 4542 /* 4543 * Return (in *usedp) the amount of space referenced by "new" that was not 4544 * referenced at the time the bookmark corresponds to. "New" may be a 4545 * snapshot or a head. The bookmark must be before new, in 4546 * new's filesystem (or its origin) -- caller verifies this. 4547 * 4548 * The written space is calculated by considering two components: First, we 4549 * ignore any freed space, and calculate the written as new's used space 4550 * minus old's used space. Next, we add in the amount of space that was freed 4551 * between the two time points, thus reducing new's used space relative to 4552 * old's. Specifically, this is the space that was born before 4553 * zbm_creation_txg, and freed before new (ie. on new's deadlist or a 4554 * previous deadlist). 4555 * 4556 * space freed [---------------------] 4557 * snapshots ---O-------O--------O-------O------ 4558 * bookmark new 4559 * 4560 * Note, the bookmark's zbm_*_bytes_refd must be valid, but if the HAS_FBN 4561 * flag is not set, we will calculate the freed_before_next based on the 4562 * next snapshot's deadlist, rather than using zbm_*_freed_before_next_snap. 4563 */ 4564 static int 4565 dsl_dataset_space_written_impl(zfs_bookmark_phys_t *bmp, 4566 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4567 { 4568 int err = 0; 4569 dsl_pool_t *dp = new->ds_dir->dd_pool; 4570 4571 ASSERT(dsl_pool_config_held(dp)); 4572 if (dsl_dataset_is_snapshot(new)) { 4573 ASSERT3U(bmp->zbm_creation_txg, <, 4574 dsl_dataset_phys(new)->ds_creation_txg); 4575 } 4576 4577 *usedp = 0; 4578 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4579 *usedp -= bmp->zbm_referenced_bytes_refd; 4580 4581 *compp = 0; 4582 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4583 *compp -= bmp->zbm_compressed_bytes_refd; 4584 4585 *uncompp = 0; 4586 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4587 *uncompp -= bmp->zbm_uncompressed_bytes_refd; 4588 4589 dsl_dataset_t *snap = new; 4590 4591 while (dsl_dataset_phys(snap)->ds_prev_snap_txg > 4592 bmp->zbm_creation_txg) { 4593 uint64_t used, comp, uncomp; 4594 4595 dsl_deadlist_space_range(&snap->ds_deadlist, 4596 0, bmp->zbm_creation_txg, 4597 &used, &comp, &uncomp); 4598 *usedp += used; 4599 *compp += comp; 4600 *uncompp += uncomp; 4601 4602 uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4603 if (snap != new) 4604 dsl_dataset_rele(snap, FTAG); 4605 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4606 if (err != 0) 4607 break; 4608 } 4609 4610 /* 4611 * We might not have the FBN if we are calculating written from 4612 * a snapshot (because we didn't know the correct "next" snapshot 4613 * until now). 4614 */ 4615 if (bmp->zbm_flags & ZBM_FLAG_HAS_FBN) { 4616 *usedp += bmp->zbm_referenced_freed_before_next_snap; 4617 *compp += bmp->zbm_compressed_freed_before_next_snap; 4618 *uncompp += bmp->zbm_uncompressed_freed_before_next_snap; 4619 } else { 4620 ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==, 4621 bmp->zbm_creation_txg); 4622 uint64_t used, comp, uncomp; 4623 dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp); 4624 *usedp += used; 4625 *compp += comp; 4626 *uncompp += uncomp; 4627 } 4628 if (snap != new) 4629 dsl_dataset_rele(snap, FTAG); 4630 return (err); 4631 } 4632 4633 /* 4634 * Return (in *usedp) the amount of space written in new that was not 4635 * present at the time the bookmark corresponds to. New may be a 4636 * snapshot or the head. Old must be a bookmark before new, in 4637 * new's filesystem (or its origin) -- caller verifies this. 4638 */ 4639 int 4640 dsl_dataset_space_written_bookmark(zfs_bookmark_phys_t *bmp, 4641 dsl_dataset_t *new, uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4642 { 4643 if (!(bmp->zbm_flags & ZBM_FLAG_HAS_FBN)) 4644 return (SET_ERROR(ENOTSUP)); 4645 return (dsl_dataset_space_written_impl(bmp, new, 4646 usedp, compp, uncompp)); 4647 } 4648 4649 /* 4650 * Return (in *usedp) the amount of space written in new that is not 4651 * present in oldsnap. New may be a snapshot or the head. Old must be 4652 * a snapshot before new, in new's filesystem (or its origin). If not then 4653 * fail and return EINVAL. 4654 */ 4655 int 4656 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4657 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4658 { 4659 if (!dsl_dataset_is_before(new, oldsnap, 0)) 4660 return (SET_ERROR(EINVAL)); 4661 4662 zfs_bookmark_phys_t zbm = { 0 }; 4663 dsl_dataset_phys_t *dsp = dsl_dataset_phys(oldsnap); 4664 zbm.zbm_guid = dsp->ds_guid; 4665 zbm.zbm_creation_txg = dsp->ds_creation_txg; 4666 zbm.zbm_creation_time = dsp->ds_creation_time; 4667 zbm.zbm_referenced_bytes_refd = dsp->ds_referenced_bytes; 4668 zbm.zbm_compressed_bytes_refd = dsp->ds_compressed_bytes; 4669 zbm.zbm_uncompressed_bytes_refd = dsp->ds_uncompressed_bytes; 4670 4671 /* 4672 * If oldsnap is the origin (or origin's origin, ...) of new, 4673 * we can't easily calculate the effective FBN. Therefore, 4674 * we do not set ZBM_FLAG_HAS_FBN, so that the _impl will calculate 4675 * it relative to the correct "next": the next snapshot towards "new", 4676 * rather than the next snapshot in oldsnap's dsl_dir. 4677 */ 4678 return (dsl_dataset_space_written_impl(&zbm, new, 4679 usedp, compp, uncompp)); 4680 } 4681 4682 /* 4683 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4684 * lastsnap, and all snapshots in between are deleted. 4685 * 4686 * blocks that would be freed [---------------------------] 4687 * snapshots ---O-------O--------O-------O--------O 4688 * firstsnap lastsnap 4689 * 4690 * This is the set of blocks that were born after the snap before firstsnap, 4691 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4692 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4693 * We calculate this by iterating over the relevant deadlists (from the snap 4694 * after lastsnap, backward to the snap after firstsnap), summing up the 4695 * space on the deadlist that was born after the snap before firstsnap. 4696 */ 4697 int 4698 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4699 dsl_dataset_t *lastsnap, 4700 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4701 { 4702 int err = 0; 4703 uint64_t snapobj; 4704 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4705 4706 ASSERT(firstsnap->ds_is_snapshot); 4707 ASSERT(lastsnap->ds_is_snapshot); 4708 4709 /* 4710 * Check that the snapshots are in the same dsl_dir, and firstsnap 4711 * is before lastsnap. 4712 */ 4713 if (firstsnap->ds_dir != lastsnap->ds_dir || 4714 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4715 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4716 return (SET_ERROR(EINVAL)); 4717 4718 *usedp = *compp = *uncompp = 0; 4719 4720 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4721 while (snapobj != firstsnap->ds_object) { 4722 dsl_dataset_t *ds; 4723 uint64_t used, comp, uncomp; 4724 4725 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4726 if (err != 0) 4727 break; 4728 4729 dsl_deadlist_space_range(&ds->ds_deadlist, 4730 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4731 &used, &comp, &uncomp); 4732 *usedp += used; 4733 *compp += comp; 4734 *uncompp += uncomp; 4735 4736 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4737 ASSERT3U(snapobj, !=, 0); 4738 dsl_dataset_rele(ds, FTAG); 4739 } 4740 return (err); 4741 } 4742 4743 /* 4744 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4745 * For example, they could both be snapshots of the same filesystem, and 4746 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4747 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4748 * filesystem. Or 'earlier' could be the origin's origin. 4749 * 4750 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4751 */ 4752 boolean_t 4753 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4754 uint64_t earlier_txg) 4755 { 4756 dsl_pool_t *dp = later->ds_dir->dd_pool; 4757 int error; 4758 boolean_t ret; 4759 4760 ASSERT(dsl_pool_config_held(dp)); 4761 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4762 4763 if (earlier_txg == 0) 4764 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4765 4766 if (later->ds_is_snapshot && 4767 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4768 return (B_FALSE); 4769 4770 if (later->ds_dir == earlier->ds_dir) 4771 return (B_TRUE); 4772 4773 /* 4774 * We check dd_origin_obj explicitly here rather than using 4775 * dsl_dir_is_clone() so that we will return TRUE if "earlier" 4776 * is $ORIGIN@$ORIGIN. dsl_dataset_space_written() depends on 4777 * this behavior. 4778 */ 4779 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == 0) 4780 return (B_FALSE); 4781 4782 dsl_dataset_t *origin; 4783 error = dsl_dataset_hold_obj(dp, 4784 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4785 if (error != 0) 4786 return (B_FALSE); 4787 if (dsl_dataset_phys(origin)->ds_creation_txg == earlier_txg && 4788 origin->ds_dir == earlier->ds_dir) { 4789 dsl_dataset_rele(origin, FTAG); 4790 return (B_TRUE); 4791 } 4792 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4793 dsl_dataset_rele(origin, FTAG); 4794 return (ret); 4795 } 4796 4797 void 4798 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4799 { 4800 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4801 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4802 } 4803 4804 boolean_t 4805 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4806 { 4807 dmu_object_info_t doi; 4808 4809 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4810 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4811 } 4812 4813 boolean_t 4814 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4815 { 4816 return (dsl_dataset_is_zapified(ds) && 4817 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4818 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4819 } 4820 4821 uint64_t 4822 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4823 { 4824 uint64_t remap_deadlist_obj; 4825 int err; 4826 4827 if (!dsl_dataset_is_zapified(ds)) 4828 return (0); 4829 4830 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4831 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4832 &remap_deadlist_obj); 4833 4834 if (err != 0) { 4835 VERIFY3S(err, ==, ENOENT); 4836 return (0); 4837 } 4838 4839 ASSERT(remap_deadlist_obj != 0); 4840 return (remap_deadlist_obj); 4841 } 4842 4843 boolean_t 4844 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4845 { 4846 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4847 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4848 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4849 } 4850 4851 static void 4852 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4853 dmu_tx_t *tx) 4854 { 4855 ASSERT(obj != 0); 4856 dsl_dataset_zapify(ds, tx); 4857 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4858 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4859 } 4860 4861 static void 4862 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4863 { 4864 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4865 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4866 } 4867 4868 void 4869 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4870 { 4871 uint64_t remap_deadlist_object; 4872 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4873 4874 ASSERT(dmu_tx_is_syncing(tx)); 4875 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4876 4877 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4878 dsl_deadlist_close(&ds->ds_remap_deadlist); 4879 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4880 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4881 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4882 } 4883 4884 void 4885 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4886 { 4887 uint64_t remap_deadlist_obj; 4888 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4889 4890 ASSERT(dmu_tx_is_syncing(tx)); 4891 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4892 /* 4893 * Currently we only create remap deadlists when there are indirect 4894 * vdevs with referenced mappings. 4895 */ 4896 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4897 4898 remap_deadlist_obj = dsl_deadlist_clone( 4899 &ds->ds_deadlist, UINT64_MAX, 4900 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4901 dsl_dataset_set_remap_deadlist_object(ds, 4902 remap_deadlist_obj, tx); 4903 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4904 remap_deadlist_obj); 4905 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4906 } 4907 4908 void 4909 dsl_dataset_activate_redaction(dsl_dataset_t *ds, uint64_t *redact_snaps, 4910 uint64_t num_redact_snaps, dmu_tx_t *tx) 4911 { 4912 uint64_t dsobj = ds->ds_object; 4913 struct feature_type_uint64_array_arg *ftuaa = 4914 kmem_zalloc(sizeof (*ftuaa), KM_SLEEP); 4915 ftuaa->length = (int64_t)num_redact_snaps; 4916 if (num_redact_snaps > 0) { 4917 ftuaa->array = kmem_alloc(num_redact_snaps * sizeof (uint64_t), 4918 KM_SLEEP); 4919 memcpy(ftuaa->array, redact_snaps, num_redact_snaps * 4920 sizeof (uint64_t)); 4921 } 4922 dsl_dataset_activate_feature(dsobj, SPA_FEATURE_REDACTED_DATASETS, 4923 ftuaa, tx); 4924 ds->ds_feature[SPA_FEATURE_REDACTED_DATASETS] = ftuaa; 4925 } 4926 4927 #if defined(_LP64) 4928 #define RECORDSIZE_PERM ZMOD_RW 4929 #else 4930 /* Limited to 1M on 32-bit platforms due to lack of virtual address space */ 4931 #define RECORDSIZE_PERM ZMOD_RD 4932 #endif 4933 ZFS_MODULE_PARAM(zfs, zfs_, max_recordsize, INT, RECORDSIZE_PERM, 4934 "Max allowed record size"); 4935 4936 ZFS_MODULE_PARAM(zfs, zfs_, allow_redacted_dataset_mount, INT, ZMOD_RW, 4937 "Allow mounting of redacted datasets"); 4938 4939 EXPORT_SYMBOL(dsl_dataset_hold); 4940 EXPORT_SYMBOL(dsl_dataset_hold_flags); 4941 EXPORT_SYMBOL(dsl_dataset_hold_obj); 4942 EXPORT_SYMBOL(dsl_dataset_hold_obj_flags); 4943 EXPORT_SYMBOL(dsl_dataset_own); 4944 EXPORT_SYMBOL(dsl_dataset_own_obj); 4945 EXPORT_SYMBOL(dsl_dataset_name); 4946 EXPORT_SYMBOL(dsl_dataset_rele); 4947 EXPORT_SYMBOL(dsl_dataset_rele_flags); 4948 EXPORT_SYMBOL(dsl_dataset_disown); 4949 EXPORT_SYMBOL(dsl_dataset_tryown); 4950 EXPORT_SYMBOL(dsl_dataset_create_sync); 4951 EXPORT_SYMBOL(dsl_dataset_create_sync_dd); 4952 EXPORT_SYMBOL(dsl_dataset_snapshot_check); 4953 EXPORT_SYMBOL(dsl_dataset_snapshot_sync); 4954 EXPORT_SYMBOL(dsl_dataset_promote); 4955 EXPORT_SYMBOL(dsl_dataset_user_hold); 4956 EXPORT_SYMBOL(dsl_dataset_user_release); 4957 EXPORT_SYMBOL(dsl_dataset_get_holds); 4958 EXPORT_SYMBOL(dsl_dataset_get_blkptr); 4959 EXPORT_SYMBOL(dsl_dataset_get_spa); 4960 EXPORT_SYMBOL(dsl_dataset_modified_since_snap); 4961 EXPORT_SYMBOL(dsl_dataset_space_written); 4962 EXPORT_SYMBOL(dsl_dataset_space_wouldfree); 4963 EXPORT_SYMBOL(dsl_dataset_sync); 4964 EXPORT_SYMBOL(dsl_dataset_block_born); 4965 EXPORT_SYMBOL(dsl_dataset_block_kill); 4966 EXPORT_SYMBOL(dsl_dataset_dirty); 4967 EXPORT_SYMBOL(dsl_dataset_stats); 4968 EXPORT_SYMBOL(dsl_dataset_fast_stat); 4969 EXPORT_SYMBOL(dsl_dataset_space); 4970 EXPORT_SYMBOL(dsl_dataset_fsid_guid); 4971 EXPORT_SYMBOL(dsl_dsobj_to_dsname); 4972 EXPORT_SYMBOL(dsl_dataset_check_quota); 4973 EXPORT_SYMBOL(dsl_dataset_clone_swap_check_impl); 4974 EXPORT_SYMBOL(dsl_dataset_clone_swap_sync_impl); 4975