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, 2018 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) 2014 Integros [integros.com] 29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. 30 * Copyright 2017 Nexenta Systems, Inc. 31 */ 32 33 #include <sys/dmu_objset.h> 34 #include <sys/dsl_dataset.h> 35 #include <sys/dsl_dir.h> 36 #include <sys/dsl_prop.h> 37 #include <sys/dsl_synctask.h> 38 #include <sys/dmu_traverse.h> 39 #include <sys/dmu_impl.h> 40 #include <sys/dmu_tx.h> 41 #include <sys/arc.h> 42 #include <sys/zio.h> 43 #include <sys/zap.h> 44 #include <sys/zfeature.h> 45 #include <sys/unique.h> 46 #include <sys/zfs_context.h> 47 #include <sys/zfs_ioctl.h> 48 #include <sys/spa.h> 49 #include <sys/spa_impl.h> 50 #include <sys/vdev.h> 51 #include <sys/zfs_znode.h> 52 #include <sys/zfs_onexit.h> 53 #include <sys/zvol.h> 54 #include <sys/dsl_scan.h> 55 #include <sys/dsl_deadlist.h> 56 #include <sys/dsl_destroy.h> 57 #include <sys/dsl_userhold.h> 58 #include <sys/dsl_bookmark.h> 59 #include <sys/dmu_recv.h> 60 #include <sys/zio_checksum.h> 61 #include <sys/zio_compress.h> 62 #include <zfs_fletcher.h> 63 64 /* 65 * The SPA supports block sizes up to 16MB. However, very large blocks 66 * can have an impact on i/o latency (e.g. tying up a spinning disk for 67 * ~300ms), and also potentially on the memory allocator. Therefore, 68 * we do not allow the recordsize to be set larger than zfs_max_recordsize 69 * (default 1MB). Larger blocks can be created by changing this tunable, 70 * and pools with larger blocks can always be imported and used, regardless 71 * of this setting. 72 */ 73 int zfs_max_recordsize = 1 * 1024 * 1024; 74 75 #define SWITCH64(x, y) \ 76 { \ 77 uint64_t __tmp = (x); \ 78 (x) = (y); \ 79 (y) = __tmp; \ 80 } 81 82 #define DS_REF_MAX (1ULL << 62) 83 84 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 85 86 static void dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, 87 uint64_t obj, dmu_tx_t *tx); 88 static void dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, 89 dmu_tx_t *tx); 90 91 static void unload_zfeature(dsl_dataset_t *ds, spa_feature_t f); 92 93 extern int spa_asize_inflation; 94 95 static zil_header_t zero_zil; 96 97 /* 98 * Figure out how much of this delta should be propogated to the dsl_dir 99 * layer. If there's a refreservation, that space has already been 100 * partially accounted for in our ancestors. 101 */ 102 static int64_t 103 parent_delta(dsl_dataset_t *ds, int64_t delta) 104 { 105 dsl_dataset_phys_t *ds_phys; 106 uint64_t old_bytes, new_bytes; 107 108 if (ds->ds_reserved == 0) 109 return (delta); 110 111 ds_phys = dsl_dataset_phys(ds); 112 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 113 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 114 115 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 116 return (new_bytes - old_bytes); 117 } 118 119 void 120 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 121 { 122 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 123 int compressed = BP_GET_PSIZE(bp); 124 int uncompressed = BP_GET_UCSIZE(bp); 125 int64_t delta; 126 127 dprintf_bp(bp, "ds=%p", ds); 128 129 ASSERT(dmu_tx_is_syncing(tx)); 130 /* It could have been compressed away to nothing */ 131 if (BP_IS_HOLE(bp)) 132 return; 133 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 134 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 135 if (ds == NULL) { 136 dsl_pool_mos_diduse_space(tx->tx_pool, 137 used, compressed, uncompressed); 138 return; 139 } 140 141 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 142 dmu_buf_will_dirty(ds->ds_dbuf, tx); 143 mutex_enter(&ds->ds_lock); 144 delta = parent_delta(ds, used); 145 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 146 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 147 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 148 dsl_dataset_phys(ds)->ds_unique_bytes += used; 149 150 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 151 ds->ds_feature_activation[SPA_FEATURE_LARGE_BLOCKS] = 152 (void *)(uintptr_t)B_TRUE; 153 } 154 155 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 156 if (f != SPA_FEATURE_NONE) { 157 ASSERT3S(spa_feature_table[f].fi_type, ==, 158 ZFEATURE_TYPE_BOOLEAN); 159 ds->ds_feature_activation[f] = (void *)(uintptr_t)B_TRUE; 160 } 161 162 mutex_exit(&ds->ds_lock); 163 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 164 compressed, uncompressed, tx); 165 dsl_dir_transfer_space(ds->ds_dir, used - delta, 166 DD_USED_REFRSRV, DD_USED_HEAD, tx); 167 } 168 169 /* 170 * Called when the specified segment has been remapped, and is thus no 171 * longer referenced in the head dataset. The vdev must be indirect. 172 * 173 * If the segment is referenced by a snapshot, put it on the remap deadlist. 174 * Otherwise, add this segment to the obsolete spacemap. 175 */ 176 void 177 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, 178 uint64_t size, uint64_t birth, dmu_tx_t *tx) 179 { 180 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 181 182 ASSERT(dmu_tx_is_syncing(tx)); 183 ASSERT(birth <= tx->tx_txg); 184 ASSERT(!ds->ds_is_snapshot); 185 186 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 187 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 188 } else { 189 blkptr_t fakebp; 190 dva_t *dva = &fakebp.blk_dva[0]; 191 192 ASSERT(ds != NULL); 193 194 mutex_enter(&ds->ds_remap_deadlist_lock); 195 if (!dsl_dataset_remap_deadlist_exists(ds)) { 196 dsl_dataset_create_remap_deadlist(ds, tx); 197 } 198 mutex_exit(&ds->ds_remap_deadlist_lock); 199 200 BP_ZERO(&fakebp); 201 fakebp.blk_birth = birth; 202 DVA_SET_VDEV(dva, vdev); 203 DVA_SET_OFFSET(dva, offset); 204 DVA_SET_ASIZE(dva, size); 205 206 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, tx); 207 } 208 } 209 210 int 211 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 212 boolean_t async) 213 { 214 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 215 216 int used = bp_get_dsize_sync(spa, bp); 217 int compressed = BP_GET_PSIZE(bp); 218 int uncompressed = BP_GET_UCSIZE(bp); 219 220 if (BP_IS_HOLE(bp)) 221 return (0); 222 223 ASSERT(dmu_tx_is_syncing(tx)); 224 ASSERT(bp->blk_birth <= tx->tx_txg); 225 226 if (ds == NULL) { 227 dsl_free(tx->tx_pool, tx->tx_txg, bp); 228 dsl_pool_mos_diduse_space(tx->tx_pool, 229 -used, -compressed, -uncompressed); 230 return (used); 231 } 232 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 233 234 ASSERT(!ds->ds_is_snapshot); 235 dmu_buf_will_dirty(ds->ds_dbuf, tx); 236 237 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 238 int64_t delta; 239 240 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 241 dsl_free(tx->tx_pool, tx->tx_txg, bp); 242 243 mutex_enter(&ds->ds_lock); 244 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 245 !DS_UNIQUE_IS_ACCURATE(ds)); 246 delta = parent_delta(ds, -used); 247 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 248 mutex_exit(&ds->ds_lock); 249 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 250 delta, -compressed, -uncompressed, tx); 251 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 252 DD_USED_REFRSRV, DD_USED_HEAD, tx); 253 } else { 254 dprintf_bp(bp, "putting on dead list: %s", ""); 255 if (async) { 256 /* 257 * We are here as part of zio's write done callback, 258 * which means we're a zio interrupt thread. We can't 259 * call dsl_deadlist_insert() now because it may block 260 * waiting for I/O. Instead, put bp on the deferred 261 * queue and let dsl_pool_sync() finish the job. 262 */ 263 bplist_append(&ds->ds_pending_deadlist, bp); 264 } else { 265 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 266 } 267 ASSERT3U(ds->ds_prev->ds_object, ==, 268 dsl_dataset_phys(ds)->ds_prev_snap_obj); 269 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 270 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 271 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 272 ds->ds_object && bp->blk_birth > 273 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 274 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 275 mutex_enter(&ds->ds_prev->ds_lock); 276 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 277 mutex_exit(&ds->ds_prev->ds_lock); 278 } 279 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 280 dsl_dir_transfer_space(ds->ds_dir, used, 281 DD_USED_HEAD, DD_USED_SNAP, tx); 282 } 283 } 284 mutex_enter(&ds->ds_lock); 285 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 286 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 287 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 288 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 289 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 290 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 291 mutex_exit(&ds->ds_lock); 292 293 return (used); 294 } 295 296 struct feature_type_uint64_array_arg { 297 uint64_t length; 298 uint64_t *array; 299 }; 300 301 static void 302 unload_zfeature(dsl_dataset_t *ds, spa_feature_t f) 303 { 304 switch (spa_feature_table[f].fi_type) { 305 case ZFEATURE_TYPE_BOOLEAN: 306 break; 307 case ZFEATURE_TYPE_UINT64_ARRAY: 308 { 309 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 310 kmem_free(ftuaa->array, ftuaa->length * sizeof (uint64_t)); 311 kmem_free(ftuaa, sizeof (*ftuaa)); 312 break; 313 } 314 default: 315 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 316 } 317 } 318 319 static int 320 load_zfeature(objset_t *mos, dsl_dataset_t *ds, spa_feature_t f) 321 { 322 int err = 0; 323 switch (spa_feature_table[f].fi_type) { 324 case ZFEATURE_TYPE_BOOLEAN: 325 err = zap_contains(mos, ds->ds_object, 326 spa_feature_table[f].fi_guid); 327 if (err == 0) { 328 ds->ds_feature[f] = (void *)(uintptr_t)B_TRUE; 329 } else { 330 ASSERT3U(err, ==, ENOENT); 331 err = 0; 332 } 333 break; 334 case ZFEATURE_TYPE_UINT64_ARRAY: 335 { 336 uint64_t int_size, num_int; 337 uint64_t *data; 338 err = zap_length(mos, ds->ds_object, 339 spa_feature_table[f].fi_guid, &int_size, &num_int); 340 if (err != 0) { 341 ASSERT3U(err, ==, ENOENT); 342 err = 0; 343 break; 344 } 345 ASSERT3U(int_size, ==, sizeof (uint64_t)); 346 data = kmem_alloc(int_size * num_int, KM_SLEEP); 347 VERIFY0(zap_lookup(mos, ds->ds_object, 348 spa_feature_table[f].fi_guid, int_size, num_int, data)); 349 struct feature_type_uint64_array_arg *ftuaa = 350 kmem_alloc(sizeof (*ftuaa), KM_SLEEP); 351 ftuaa->length = num_int; 352 ftuaa->array = data; 353 ds->ds_feature[f] = ftuaa; 354 break; 355 } 356 default: 357 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 358 } 359 return (err); 360 } 361 362 /* 363 * We have to release the fsid syncronously or we risk that a subsequent 364 * mount of the same dataset will fail to unique_insert the fsid. This 365 * failure would manifest itself as the fsid of this dataset changing 366 * between mounts which makes NFS clients quite unhappy. 367 */ 368 static void 369 dsl_dataset_evict_sync(void *dbu) 370 { 371 dsl_dataset_t *ds = dbu; 372 373 ASSERT(ds->ds_owner == NULL); 374 375 unique_remove(ds->ds_fsid_guid); 376 } 377 378 static void 379 dsl_dataset_evict_async(void *dbu) 380 { 381 dsl_dataset_t *ds = dbu; 382 383 ASSERT(ds->ds_owner == NULL); 384 385 ds->ds_dbuf = NULL; 386 387 if (ds->ds_objset != NULL) 388 dmu_objset_evict(ds->ds_objset); 389 390 if (ds->ds_prev) { 391 dsl_dataset_rele(ds->ds_prev, ds); 392 ds->ds_prev = NULL; 393 } 394 395 bplist_destroy(&ds->ds_pending_deadlist); 396 if (dsl_deadlist_is_open(&ds->ds_deadlist)) 397 dsl_deadlist_close(&ds->ds_deadlist); 398 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 399 dsl_deadlist_close(&ds->ds_remap_deadlist); 400 if (ds->ds_dir) 401 dsl_dir_async_rele(ds->ds_dir, ds); 402 403 ASSERT(!list_link_active(&ds->ds_synced_link)); 404 405 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 406 if (dsl_dataset_feature_is_active(ds, f)) 407 unload_zfeature(ds, f); 408 } 409 410 list_destroy(&ds->ds_prop_cbs); 411 mutex_destroy(&ds->ds_lock); 412 mutex_destroy(&ds->ds_opening_lock); 413 mutex_destroy(&ds->ds_sendstream_lock); 414 mutex_destroy(&ds->ds_remap_deadlist_lock); 415 zfs_refcount_destroy(&ds->ds_longholds); 416 rrw_destroy(&ds->ds_bp_rwlock); 417 418 kmem_free(ds, sizeof (dsl_dataset_t)); 419 } 420 421 int 422 dsl_dataset_get_snapname(dsl_dataset_t *ds) 423 { 424 dsl_dataset_phys_t *headphys; 425 int err; 426 dmu_buf_t *headdbuf; 427 dsl_pool_t *dp = ds->ds_dir->dd_pool; 428 objset_t *mos = dp->dp_meta_objset; 429 430 if (ds->ds_snapname[0]) 431 return (0); 432 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 433 return (0); 434 435 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 436 FTAG, &headdbuf); 437 if (err != 0) 438 return (err); 439 headphys = headdbuf->db_data; 440 err = zap_value_search(dp->dp_meta_objset, 441 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 442 dmu_buf_rele(headdbuf, FTAG); 443 return (err); 444 } 445 446 int 447 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 448 { 449 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 450 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 451 matchtype_t mt = 0; 452 int err; 453 454 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 455 mt = MT_NORMALIZE; 456 457 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 458 value, mt, NULL, 0, NULL); 459 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 460 err = zap_lookup(mos, snapobj, name, 8, 1, value); 461 return (err); 462 } 463 464 int 465 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 466 boolean_t adj_cnt) 467 { 468 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 469 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 470 matchtype_t mt = 0; 471 int err; 472 473 dsl_dir_snap_cmtime_update(ds->ds_dir); 474 475 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 476 mt = MT_NORMALIZE; 477 478 err = zap_remove_norm(mos, snapobj, name, mt, tx); 479 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 480 err = zap_remove(mos, snapobj, name, tx); 481 482 if (err == 0 && adj_cnt) 483 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 484 DD_FIELD_SNAPSHOT_COUNT, tx); 485 486 return (err); 487 } 488 489 boolean_t 490 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 491 { 492 dmu_buf_t *dbuf = ds->ds_dbuf; 493 boolean_t result = B_FALSE; 494 495 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 496 ds->ds_object, DMU_BONUS_BLKID, tag)) { 497 498 if (ds == dmu_buf_get_user(dbuf)) 499 result = B_TRUE; 500 else 501 dmu_buf_rele(dbuf, tag); 502 } 503 504 return (result); 505 } 506 507 int 508 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 509 dsl_dataset_t **dsp) 510 { 511 objset_t *mos = dp->dp_meta_objset; 512 dmu_buf_t *dbuf; 513 dsl_dataset_t *ds; 514 int err; 515 dmu_object_info_t doi; 516 517 ASSERT(dsl_pool_config_held(dp)); 518 519 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 520 if (err != 0) 521 return (err); 522 523 /* Make sure dsobj has the correct object type. */ 524 dmu_object_info_from_db(dbuf, &doi); 525 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 526 dmu_buf_rele(dbuf, tag); 527 return (SET_ERROR(EINVAL)); 528 } 529 530 ds = dmu_buf_get_user(dbuf); 531 if (ds == NULL) { 532 dsl_dataset_t *winner = NULL; 533 534 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 535 ds->ds_dbuf = dbuf; 536 ds->ds_object = dsobj; 537 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 538 539 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, 540 NULL, ds, &ds->ds_dir); 541 if (err != 0) { 542 kmem_free(ds, sizeof (dsl_dataset_t)); 543 dmu_buf_rele(dbuf, tag); 544 return (err); 545 } 546 547 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 548 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 549 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 550 mutex_init(&ds->ds_remap_deadlist_lock, 551 NULL, MUTEX_DEFAULT, NULL); 552 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 553 zfs_refcount_create(&ds->ds_longholds); 554 555 bplist_create(&ds->ds_pending_deadlist); 556 557 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 558 offsetof(dmu_sendarg_t, dsa_link)); 559 560 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 561 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 562 563 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 564 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 565 if (!(spa_feature_table[f].fi_flags & 566 ZFEATURE_FLAG_PER_DATASET)) 567 continue; 568 err = load_zfeature(mos, ds, f); 569 } 570 } 571 572 if (!ds->ds_is_snapshot) { 573 ds->ds_snapname[0] = '\0'; 574 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 575 err = dsl_dataset_hold_obj(dp, 576 dsl_dataset_phys(ds)->ds_prev_snap_obj, 577 ds, &ds->ds_prev); 578 } 579 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 580 int zaperr = zap_lookup(mos, ds->ds_object, 581 DS_FIELD_BOOKMARK_NAMES, 582 sizeof (ds->ds_bookmarks), 1, 583 &ds->ds_bookmarks); 584 if (zaperr != ENOENT) 585 VERIFY0(zaperr); 586 } 587 } else { 588 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 589 err = dsl_dataset_get_snapname(ds); 590 if (err == 0 && 591 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 592 err = zap_count( 593 ds->ds_dir->dd_pool->dp_meta_objset, 594 dsl_dataset_phys(ds)->ds_userrefs_obj, 595 &ds->ds_userrefs); 596 } 597 } 598 599 if (err == 0 && !ds->ds_is_snapshot) { 600 err = dsl_prop_get_int_ds(ds, 601 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 602 &ds->ds_reserved); 603 if (err == 0) { 604 err = dsl_prop_get_int_ds(ds, 605 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 606 &ds->ds_quota); 607 } 608 } else { 609 ds->ds_reserved = ds->ds_quota = 0; 610 } 611 612 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 && 613 ds->ds_is_snapshot && 614 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { 615 dp->dp_spa->spa_errata = 616 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; 617 } 618 619 dsl_deadlist_open(&ds->ds_deadlist, 620 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 621 uint64_t remap_deadlist_obj = 622 dsl_dataset_get_remap_deadlist_object(ds); 623 if (remap_deadlist_obj != 0) { 624 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 625 remap_deadlist_obj); 626 } 627 628 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 629 dsl_dataset_evict_async, &ds->ds_dbuf); 630 if (err == 0) 631 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 632 633 if (err != 0 || winner != NULL) { 634 bplist_destroy(&ds->ds_pending_deadlist); 635 dsl_deadlist_close(&ds->ds_deadlist); 636 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 637 dsl_deadlist_close(&ds->ds_remap_deadlist); 638 if (ds->ds_prev) 639 dsl_dataset_rele(ds->ds_prev, ds); 640 dsl_dir_rele(ds->ds_dir, ds); 641 list_destroy(&ds->ds_prop_cbs); 642 list_destroy(&ds->ds_sendstreams); 643 mutex_destroy(&ds->ds_lock); 644 mutex_destroy(&ds->ds_opening_lock); 645 mutex_destroy(&ds->ds_sendstream_lock); 646 mutex_destroy(&ds->ds_remap_deadlist_lock); 647 zfs_refcount_destroy(&ds->ds_longholds); 648 rrw_destroy(&ds->ds_bp_rwlock); 649 kmem_free(ds, sizeof (dsl_dataset_t)); 650 if (err != 0) { 651 dmu_buf_rele(dbuf, tag); 652 return (err); 653 } 654 ds = winner; 655 } else { 656 ds->ds_fsid_guid = 657 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 658 if (ds->ds_fsid_guid != 659 dsl_dataset_phys(ds)->ds_fsid_guid) { 660 zfs_dbgmsg("ds_fsid_guid changed from " 661 "%llx to %llx for pool %s dataset id %llu", 662 (long long) 663 dsl_dataset_phys(ds)->ds_fsid_guid, 664 (long long)ds->ds_fsid_guid, 665 spa_name(dp->dp_spa), 666 dsobj); 667 } 668 } 669 } 670 671 ASSERT3P(ds->ds_dbuf, ==, dbuf); 672 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 673 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 674 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 675 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 676 *dsp = ds; 677 678 return (0); 679 } 680 681 int 682 dsl_dataset_create_key_mapping(dsl_dataset_t *ds) 683 { 684 dsl_dir_t *dd = ds->ds_dir; 685 686 if (dd->dd_crypto_obj == 0) 687 return (0); 688 689 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, 690 ds, ds, &ds->ds_key_mapping)); 691 } 692 693 int 694 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, 695 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp) 696 { 697 int err; 698 699 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 700 if (err != 0) 701 return (err); 702 703 ASSERT3P(*dsp, !=, NULL); 704 705 if (flags & DS_HOLD_FLAG_DECRYPT) { 706 err = dsl_dataset_create_key_mapping(*dsp); 707 if (err != 0) 708 dsl_dataset_rele(*dsp, tag); 709 } 710 711 return (err); 712 } 713 714 int 715 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 716 void *tag, dsl_dataset_t **dsp) 717 { 718 dsl_dir_t *dd; 719 const char *snapname; 720 uint64_t obj; 721 int err = 0; 722 dsl_dataset_t *ds; 723 724 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 725 if (err != 0) 726 return (err); 727 728 ASSERT(dsl_pool_config_held(dp)); 729 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 730 if (obj != 0) 731 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds); 732 else 733 err = SET_ERROR(ENOENT); 734 735 /* we may be looking for a snapshot */ 736 if (err == 0 && snapname != NULL) { 737 dsl_dataset_t *snap_ds; 738 739 if (*snapname++ != '@') { 740 dsl_dataset_rele_flags(ds, flags, tag); 741 dsl_dir_rele(dd, FTAG); 742 return (SET_ERROR(ENOENT)); 743 } 744 745 dprintf("looking for snapshot '%s'\n", snapname); 746 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 747 if (err == 0) { 748 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, 749 &snap_ds); 750 } 751 dsl_dataset_rele_flags(ds, flags, tag); 752 753 if (err == 0) { 754 mutex_enter(&snap_ds->ds_lock); 755 if (snap_ds->ds_snapname[0] == 0) 756 (void) strlcpy(snap_ds->ds_snapname, snapname, 757 sizeof (snap_ds->ds_snapname)); 758 mutex_exit(&snap_ds->ds_lock); 759 ds = snap_ds; 760 } 761 } 762 if (err == 0) 763 *dsp = ds; 764 dsl_dir_rele(dd, FTAG); 765 return (err); 766 } 767 768 int 769 dsl_dataset_hold(dsl_pool_t *dp, const char *name, void *tag, 770 dsl_dataset_t **dsp) 771 { 772 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); 773 } 774 775 int 776 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 777 void *tag, dsl_dataset_t **dsp) 778 { 779 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); 780 if (err != 0) 781 return (err); 782 if (!dsl_dataset_tryown(*dsp, tag)) { 783 dsl_dataset_rele_flags(*dsp, flags, tag); 784 *dsp = NULL; 785 return (SET_ERROR(EBUSY)); 786 } 787 return (0); 788 } 789 790 int 791 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 792 void *tag, dsl_dataset_t **dsp) 793 { 794 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); 795 if (err != 0) 796 return (err); 797 if (!dsl_dataset_tryown(*dsp, tag)) { 798 dsl_dataset_rele_flags(*dsp, flags, tag); 799 return (SET_ERROR(EBUSY)); 800 } 801 return (0); 802 } 803 804 /* 805 * See the comment above dsl_pool_hold() for details. In summary, a long 806 * hold is used to prevent destruction of a dataset while the pool hold 807 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 808 * 809 * The dataset and pool must be held when this function is called. After it 810 * is called, the pool hold may be released while the dataset is still held 811 * and accessed. 812 */ 813 void 814 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 815 { 816 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 817 (void) zfs_refcount_add(&ds->ds_longholds, tag); 818 } 819 820 void 821 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 822 { 823 (void) zfs_refcount_remove(&ds->ds_longholds, tag); 824 } 825 826 /* Return B_TRUE if there are any long holds on this dataset. */ 827 boolean_t 828 dsl_dataset_long_held(dsl_dataset_t *ds) 829 { 830 return (!zfs_refcount_is_zero(&ds->ds_longholds)); 831 } 832 833 void 834 dsl_dataset_name(dsl_dataset_t *ds, char *name) 835 { 836 if (ds == NULL) { 837 (void) strcpy(name, "mos"); 838 } else { 839 dsl_dir_name(ds->ds_dir, name); 840 VERIFY0(dsl_dataset_get_snapname(ds)); 841 if (ds->ds_snapname[0]) { 842 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 843 <, ZFS_MAX_DATASET_NAME_LEN); 844 /* 845 * We use a "recursive" mutex so that we 846 * can call dprintf_ds() with ds_lock held. 847 */ 848 if (!MUTEX_HELD(&ds->ds_lock)) { 849 mutex_enter(&ds->ds_lock); 850 VERIFY3U(strlcat(name, ds->ds_snapname, 851 ZFS_MAX_DATASET_NAME_LEN), <, 852 ZFS_MAX_DATASET_NAME_LEN); 853 mutex_exit(&ds->ds_lock); 854 } else { 855 VERIFY3U(strlcat(name, ds->ds_snapname, 856 ZFS_MAX_DATASET_NAME_LEN), <, 857 ZFS_MAX_DATASET_NAME_LEN); 858 } 859 } 860 } 861 } 862 863 int 864 dsl_dataset_namelen(dsl_dataset_t *ds) 865 { 866 VERIFY0(dsl_dataset_get_snapname(ds)); 867 mutex_enter(&ds->ds_lock); 868 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 869 mutex_exit(&ds->ds_lock); 870 return (len); 871 } 872 873 void 874 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 875 { 876 dmu_buf_rele(ds->ds_dbuf, tag); 877 } 878 879 void 880 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) 881 { 882 dsl_dir_t *dd = ds->ds_dir; 883 884 if (dd == NULL || dd->dd_crypto_obj == 0) 885 return; 886 887 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, 888 ds->ds_object, ds); 889 } 890 891 void 892 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 893 { 894 if (flags & DS_HOLD_FLAG_DECRYPT) 895 dsl_dataset_remove_key_mapping(ds); 896 897 dsl_dataset_rele(ds, tag); 898 } 899 900 void 901 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 902 { 903 ASSERT3P(ds->ds_owner, ==, tag); 904 ASSERT(ds->ds_dbuf != NULL); 905 906 mutex_enter(&ds->ds_lock); 907 ds->ds_owner = NULL; 908 mutex_exit(&ds->ds_lock); 909 dsl_dataset_long_rele(ds, tag); 910 dsl_dataset_rele_flags(ds, flags, tag); 911 } 912 913 boolean_t 914 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 915 { 916 boolean_t gotit = FALSE; 917 918 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 919 mutex_enter(&ds->ds_lock); 920 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 921 ds->ds_owner = tag; 922 dsl_dataset_long_hold(ds, tag); 923 gotit = TRUE; 924 } 925 mutex_exit(&ds->ds_lock); 926 return (gotit); 927 } 928 929 boolean_t 930 dsl_dataset_has_owner(dsl_dataset_t *ds) 931 { 932 boolean_t rv; 933 mutex_enter(&ds->ds_lock); 934 rv = (ds->ds_owner != NULL); 935 mutex_exit(&ds->ds_lock); 936 return (rv); 937 } 938 939 static boolean_t 940 zfeature_active(spa_feature_t f, void *arg) 941 { 942 switch (spa_feature_table[f].fi_type) { 943 case ZFEATURE_TYPE_BOOLEAN: { 944 boolean_t val = (boolean_t)(uintptr_t)arg; 945 ASSERT(val == B_FALSE || val == B_TRUE); 946 return (val); 947 } 948 case ZFEATURE_TYPE_UINT64_ARRAY: 949 /* 950 * In this case, arg is a uint64_t array. The feature is active 951 * if the array is non-null. 952 */ 953 return (arg != NULL); 954 default: 955 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 956 } 957 } 958 959 boolean_t 960 dsl_dataset_feature_is_active(dsl_dataset_t *ds, spa_feature_t f) 961 { 962 return (zfeature_active(f, ds->ds_feature[f])); 963 } 964 965 /* 966 * The buffers passed out by this function are references to internal buffers; 967 * they should not be freed by callers of this function, and they should not be 968 * used after the dataset has been released. 969 */ 970 boolean_t 971 dsl_dataset_get_uint64_array_feature(dsl_dataset_t *ds, spa_feature_t f, 972 uint64_t *outlength, uint64_t **outp) 973 { 974 VERIFY(spa_feature_table[f].fi_type & ZFEATURE_TYPE_UINT64_ARRAY); 975 if (!dsl_dataset_feature_is_active(ds, f)) { 976 return (B_FALSE); 977 } 978 struct feature_type_uint64_array_arg *ftuaa = ds->ds_feature[f]; 979 *outp = ftuaa->array; 980 *outlength = ftuaa->length; 981 return (B_TRUE); 982 } 983 984 void 985 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, void *arg, 986 dmu_tx_t *tx) 987 { 988 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 989 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 990 uint64_t zero = 0; 991 992 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 993 994 spa_feature_incr(spa, f, tx); 995 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 996 997 switch (spa_feature_table[f].fi_type) { 998 case ZFEATURE_TYPE_BOOLEAN: 999 ASSERT3S((boolean_t)arg, ==, B_TRUE); 1000 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1001 sizeof (zero), 1, &zero, tx)); 1002 break; 1003 case ZFEATURE_TYPE_UINT64_ARRAY: 1004 { 1005 struct feature_type_uint64_array_arg *ftuaa = arg; 1006 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 1007 sizeof (uint64_t), ftuaa->length, ftuaa->array, tx)); 1008 break; 1009 } 1010 default: 1011 panic("Invalid zfeature type %d", spa_feature_table[f].fi_type); 1012 } 1013 } 1014 1015 void 1016 dsl_dataset_deactivate_feature_impl(dsl_dataset_t *ds, spa_feature_t f, 1017 dmu_tx_t *tx) 1018 { 1019 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1020 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 1021 uint64_t dsobj = ds->ds_object; 1022 1023 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 1024 1025 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 1026 spa_feature_decr(spa, f, tx); 1027 ds->ds_feature[f] = NULL; 1028 } 1029 1030 void 1031 dsl_dataset_deactivate_feature(dsl_dataset_t *ds, spa_feature_t f, dmu_tx_t *tx) 1032 { 1033 unload_zfeature(ds, f); 1034 dsl_dataset_deactivate_feature_impl(ds, f, tx); 1035 } 1036 1037 uint64_t 1038 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 1039 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx) 1040 { 1041 dsl_pool_t *dp = dd->dd_pool; 1042 dmu_buf_t *dbuf; 1043 dsl_dataset_phys_t *dsphys; 1044 uint64_t dsobj; 1045 objset_t *mos = dp->dp_meta_objset; 1046 1047 if (origin == NULL) 1048 origin = dp->dp_origin_snap; 1049 1050 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 1051 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 1052 ASSERT(dmu_tx_is_syncing(tx)); 1053 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 1054 1055 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1056 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1057 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1058 dmu_buf_will_dirty(dbuf, tx); 1059 dsphys = dbuf->db_data; 1060 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1061 dsphys->ds_dir_obj = dd->dd_object; 1062 dsphys->ds_flags = flags; 1063 dsphys->ds_fsid_guid = unique_create(); 1064 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1065 sizeof (dsphys->ds_guid)); 1066 dsphys->ds_snapnames_zapobj = 1067 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 1068 DMU_OT_NONE, 0, tx); 1069 dsphys->ds_creation_time = gethrestime_sec(); 1070 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 1071 1072 if (origin == NULL) { 1073 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 1074 } else { 1075 dsl_dataset_t *ohds; /* head of the origin snapshot */ 1076 1077 dsphys->ds_prev_snap_obj = origin->ds_object; 1078 dsphys->ds_prev_snap_txg = 1079 dsl_dataset_phys(origin)->ds_creation_txg; 1080 dsphys->ds_referenced_bytes = 1081 dsl_dataset_phys(origin)->ds_referenced_bytes; 1082 dsphys->ds_compressed_bytes = 1083 dsl_dataset_phys(origin)->ds_compressed_bytes; 1084 dsphys->ds_uncompressed_bytes = 1085 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 1086 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 1087 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 1088 rrw_exit(&origin->ds_bp_rwlock, FTAG); 1089 1090 /* 1091 * Inherit flags that describe the dataset's contents 1092 * (INCONSISTENT) or properties (Case Insensitive). 1093 */ 1094 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 1095 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 1096 1097 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1098 if (zfeature_active(f, origin->ds_feature[f])) { 1099 dsl_dataset_activate_feature(dsobj, f, 1100 origin->ds_feature[f], tx); 1101 } 1102 } 1103 1104 dmu_buf_will_dirty(origin->ds_dbuf, tx); 1105 dsl_dataset_phys(origin)->ds_num_children++; 1106 1107 VERIFY0(dsl_dataset_hold_obj(dp, 1108 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 1109 FTAG, &ohds)); 1110 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 1111 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 1112 dsl_dataset_rele(ohds, FTAG); 1113 1114 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 1115 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 1116 dsl_dataset_phys(origin)->ds_next_clones_obj = 1117 zap_create(mos, 1118 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 1119 } 1120 VERIFY0(zap_add_int(mos, 1121 dsl_dataset_phys(origin)->ds_next_clones_obj, 1122 dsobj, tx)); 1123 } 1124 1125 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1126 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 1127 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 1128 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 1129 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 1130 dsl_dir_phys(origin->ds_dir)->dd_clones = 1131 zap_create(mos, 1132 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 1133 } 1134 VERIFY0(zap_add_int(mos, 1135 dsl_dir_phys(origin->ds_dir)->dd_clones, 1136 dsobj, tx)); 1137 } 1138 } 1139 1140 /* handle encryption */ 1141 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx); 1142 1143 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1144 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1145 1146 dmu_buf_rele(dbuf, FTAG); 1147 1148 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1149 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 1150 1151 return (dsobj); 1152 } 1153 1154 static void 1155 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 1156 { 1157 objset_t *os; 1158 1159 VERIFY0(dmu_objset_from_ds(ds, &os)); 1160 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 1161 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1162 zio_t *zio; 1163 1164 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 1165 if (os->os_encrypted) 1166 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; 1167 1168 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1169 dsl_dataset_sync(ds, zio, tx); 1170 VERIFY0(zio_wait(zio)); 1171 1172 /* dsl_dataset_sync_done will drop this reference. */ 1173 dmu_buf_add_ref(ds->ds_dbuf, ds); 1174 dsl_dataset_sync_done(ds, tx); 1175 } 1176 } 1177 1178 uint64_t 1179 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1180 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1181 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1182 { 1183 dsl_pool_t *dp = pdd->dd_pool; 1184 uint64_t dsobj, ddobj; 1185 dsl_dir_t *dd; 1186 1187 ASSERT(dmu_tx_is_syncing(tx)); 1188 ASSERT(lastname[0] != '@'); 1189 1190 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1191 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1192 1193 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1194 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1195 1196 dsl_deleg_set_create_perms(dd, tx, cr); 1197 1198 /* 1199 * Since we're creating a new node we know it's a leaf, so we can 1200 * initialize the counts if the limit feature is active. 1201 */ 1202 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1203 uint64_t cnt = 0; 1204 objset_t *os = dd->dd_pool->dp_meta_objset; 1205 1206 dsl_dir_zapify(dd, tx); 1207 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1208 sizeof (cnt), 1, &cnt, tx)); 1209 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1210 sizeof (cnt), 1, &cnt, tx)); 1211 } 1212 1213 dsl_dir_rele(dd, FTAG); 1214 1215 /* 1216 * If we are creating a clone, make sure we zero out any stale 1217 * data from the origin snapshots zil header. 1218 */ 1219 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1220 dsl_dataset_t *ds; 1221 1222 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1223 dsl_dataset_zero_zil(ds, tx); 1224 dsl_dataset_rele(ds, FTAG); 1225 } 1226 1227 return (dsobj); 1228 } 1229 1230 /* 1231 * The unique space in the head dataset can be calculated by subtracting 1232 * the space used in the most recent snapshot, that is still being used 1233 * in this file system, from the space currently in use. To figure out 1234 * the space in the most recent snapshot still in use, we need to take 1235 * the total space used in the snapshot and subtract out the space that 1236 * has been freed up since the snapshot was taken. 1237 */ 1238 void 1239 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1240 { 1241 uint64_t mrs_used; 1242 uint64_t dlused, dlcomp, dluncomp; 1243 1244 ASSERT(!ds->ds_is_snapshot); 1245 1246 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1247 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1248 else 1249 mrs_used = 0; 1250 1251 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1252 1253 ASSERT3U(dlused, <=, mrs_used); 1254 dsl_dataset_phys(ds)->ds_unique_bytes = 1255 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1256 1257 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1258 SPA_VERSION_UNIQUE_ACCURATE) 1259 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1260 } 1261 1262 void 1263 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1264 dmu_tx_t *tx) 1265 { 1266 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1267 uint64_t count; 1268 int err; 1269 1270 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1271 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1272 obj, tx); 1273 /* 1274 * The err should not be ENOENT, but a bug in a previous version 1275 * of the code could cause upgrade_clones_cb() to not set 1276 * ds_next_snap_obj when it should, leading to a missing entry. 1277 * If we knew that the pool was created after 1278 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1279 * ENOENT. However, at least we can check that we don't have 1280 * too many entries in the next_clones_obj even after failing to 1281 * remove this one. 1282 */ 1283 if (err != ENOENT) 1284 VERIFY0(err); 1285 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1286 &count)); 1287 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1288 } 1289 1290 1291 blkptr_t * 1292 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1293 { 1294 return (&dsl_dataset_phys(ds)->ds_bp); 1295 } 1296 1297 spa_t * 1298 dsl_dataset_get_spa(dsl_dataset_t *ds) 1299 { 1300 return (ds->ds_dir->dd_pool->dp_spa); 1301 } 1302 1303 void 1304 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1305 { 1306 dsl_pool_t *dp; 1307 1308 if (ds == NULL) /* this is the meta-objset */ 1309 return; 1310 1311 ASSERT(ds->ds_objset != NULL); 1312 1313 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1314 panic("dirtying snapshot!"); 1315 1316 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1317 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1318 1319 dp = ds->ds_dir->dd_pool; 1320 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1321 objset_t *os = ds->ds_objset; 1322 1323 /* up the hold count until we can be written out */ 1324 dmu_buf_add_ref(ds->ds_dbuf, ds); 1325 1326 /* if this dataset is encrypted, grab a reference to the DCK */ 1327 if (ds->ds_dir->dd_crypto_obj != 0 && 1328 !os->os_raw_receive && 1329 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1330 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1331 key_mapping_add_ref(ds->ds_key_mapping, ds); 1332 } 1333 } 1334 } 1335 1336 boolean_t 1337 dsl_dataset_is_dirty(dsl_dataset_t *ds) 1338 { 1339 for (int t = 0; t < TXG_SIZE; t++) { 1340 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1341 ds, t)) 1342 return (B_TRUE); 1343 } 1344 return (B_FALSE); 1345 } 1346 1347 static int 1348 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1349 { 1350 uint64_t asize; 1351 1352 if (!dmu_tx_is_syncing(tx)) 1353 return (0); 1354 1355 /* 1356 * If there's an fs-only reservation, any blocks that might become 1357 * owned by the snapshot dataset must be accommodated by space 1358 * outside of the reservation. 1359 */ 1360 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1361 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1362 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1363 return (SET_ERROR(ENOSPC)); 1364 1365 /* 1366 * Propagate any reserved space for this snapshot to other 1367 * snapshot checks in this sync group. 1368 */ 1369 if (asize > 0) 1370 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1371 1372 return (0); 1373 } 1374 1375 int 1376 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1377 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1378 { 1379 int error; 1380 uint64_t value; 1381 1382 ds->ds_trysnap_txg = tx->tx_txg; 1383 1384 if (!dmu_tx_is_syncing(tx)) 1385 return (0); 1386 1387 /* 1388 * We don't allow multiple snapshots of the same txg. If there 1389 * is already one, try again. 1390 */ 1391 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1392 return (SET_ERROR(EAGAIN)); 1393 1394 /* 1395 * Check for conflicting snapshot name. 1396 */ 1397 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1398 if (error == 0) 1399 return (SET_ERROR(EEXIST)); 1400 if (error != ENOENT) 1401 return (error); 1402 1403 /* 1404 * We don't allow taking snapshots of inconsistent datasets, such as 1405 * those into which we are currently receiving. However, if we are 1406 * creating this snapshot as part of a receive, this check will be 1407 * executed atomically with respect to the completion of the receive 1408 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1409 * case we ignore this, knowing it will be fixed up for us shortly in 1410 * dmu_recv_end_sync(). 1411 */ 1412 if (!recv && DS_IS_INCONSISTENT(ds)) 1413 return (SET_ERROR(EBUSY)); 1414 1415 /* 1416 * Skip the check for temporary snapshots or if we have already checked 1417 * the counts in dsl_dataset_snapshot_check. This means we really only 1418 * check the count here when we're receiving a stream. 1419 */ 1420 if (cnt != 0 && cr != NULL) { 1421 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1422 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1423 if (error != 0) 1424 return (error); 1425 } 1426 1427 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1428 if (error != 0) 1429 return (error); 1430 1431 return (0); 1432 } 1433 1434 int 1435 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1436 { 1437 dsl_dataset_snapshot_arg_t *ddsa = arg; 1438 dsl_pool_t *dp = dmu_tx_pool(tx); 1439 nvpair_t *pair; 1440 int rv = 0; 1441 1442 /* 1443 * Pre-compute how many total new snapshots will be created for each 1444 * level in the tree and below. This is needed for validating the 1445 * snapshot limit when either taking a recursive snapshot or when 1446 * taking multiple snapshots. 1447 * 1448 * The problem is that the counts are not actually adjusted when 1449 * we are checking, only when we finally sync. For a single snapshot, 1450 * this is easy, the count will increase by 1 at each node up the tree, 1451 * but its more complicated for the recursive/multiple snapshot case. 1452 * 1453 * The dsl_fs_ss_limit_check function does recursively check the count 1454 * at each level up the tree but since it is validating each snapshot 1455 * independently we need to be sure that we are validating the complete 1456 * count for the entire set of snapshots. We do this by rolling up the 1457 * counts for each component of the name into an nvlist and then 1458 * checking each of those cases with the aggregated count. 1459 * 1460 * This approach properly handles not only the recursive snapshot 1461 * case (where we get all of those on the ddsa_snaps list) but also 1462 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1463 * validate the limit on 'a' using a count of 2). 1464 * 1465 * We validate the snapshot names in the third loop and only report 1466 * name errors once. 1467 */ 1468 if (dmu_tx_is_syncing(tx)) { 1469 nvlist_t *cnt_track = NULL; 1470 cnt_track = fnvlist_alloc(); 1471 1472 /* Rollup aggregated counts into the cnt_track list */ 1473 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1474 pair != NULL; 1475 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1476 char *pdelim; 1477 uint64_t val; 1478 char nm[MAXPATHLEN]; 1479 1480 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1481 pdelim = strchr(nm, '@'); 1482 if (pdelim == NULL) 1483 continue; 1484 *pdelim = '\0'; 1485 1486 do { 1487 if (nvlist_lookup_uint64(cnt_track, nm, 1488 &val) == 0) { 1489 /* update existing entry */ 1490 fnvlist_add_uint64(cnt_track, nm, 1491 val + 1); 1492 } else { 1493 /* add to list */ 1494 fnvlist_add_uint64(cnt_track, nm, 1); 1495 } 1496 1497 pdelim = strrchr(nm, '/'); 1498 if (pdelim != NULL) 1499 *pdelim = '\0'; 1500 } while (pdelim != NULL); 1501 } 1502 1503 /* Check aggregated counts at each level */ 1504 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1505 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1506 int error = 0; 1507 char *name; 1508 uint64_t cnt = 0; 1509 dsl_dataset_t *ds; 1510 1511 name = nvpair_name(pair); 1512 cnt = fnvpair_value_uint64(pair); 1513 ASSERT(cnt > 0); 1514 1515 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1516 if (error == 0) { 1517 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1518 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1519 ddsa->ddsa_cr); 1520 dsl_dataset_rele(ds, FTAG); 1521 } 1522 1523 if (error != 0) { 1524 if (ddsa->ddsa_errors != NULL) 1525 fnvlist_add_int32(ddsa->ddsa_errors, 1526 name, error); 1527 rv = error; 1528 /* only report one error for this check */ 1529 break; 1530 } 1531 } 1532 nvlist_free(cnt_track); 1533 } 1534 1535 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1536 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1537 int error = 0; 1538 dsl_dataset_t *ds; 1539 char *name, *atp; 1540 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1541 1542 name = nvpair_name(pair); 1543 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1544 error = SET_ERROR(ENAMETOOLONG); 1545 if (error == 0) { 1546 atp = strchr(name, '@'); 1547 if (atp == NULL) 1548 error = SET_ERROR(EINVAL); 1549 if (error == 0) 1550 (void) strlcpy(dsname, name, atp - name + 1); 1551 } 1552 if (error == 0) 1553 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1554 if (error == 0) { 1555 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1556 error = dsl_dataset_snapshot_check_impl(ds, 1557 atp + 1, tx, B_FALSE, 0, NULL); 1558 dsl_dataset_rele(ds, FTAG); 1559 } 1560 1561 if (error != 0) { 1562 if (ddsa->ddsa_errors != NULL) { 1563 fnvlist_add_int32(ddsa->ddsa_errors, 1564 name, error); 1565 } 1566 rv = error; 1567 } 1568 } 1569 1570 return (rv); 1571 } 1572 1573 void 1574 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1575 dmu_tx_t *tx) 1576 { 1577 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1578 dmu_buf_t *dbuf; 1579 dsl_dataset_phys_t *dsphys; 1580 uint64_t dsobj, crtxg; 1581 objset_t *mos = dp->dp_meta_objset; 1582 objset_t *os; 1583 1584 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1585 1586 /* 1587 * If we are on an old pool, the zil must not be active, in which 1588 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1589 */ 1590 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1591 dmu_objset_from_ds(ds, &os) != 0 || 1592 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1593 sizeof (zero_zil)) == 0); 1594 1595 /* Should not snapshot a dirty dataset. */ 1596 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1597 ds, tx->tx_txg)); 1598 1599 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1600 1601 /* 1602 * The origin's ds_creation_txg has to be < TXG_INITIAL 1603 */ 1604 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1605 crtxg = 1; 1606 else 1607 crtxg = tx->tx_txg; 1608 1609 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1610 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1611 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1612 dmu_buf_will_dirty(dbuf, tx); 1613 dsphys = dbuf->db_data; 1614 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1615 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1616 dsphys->ds_fsid_guid = unique_create(); 1617 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1618 sizeof (dsphys->ds_guid)); 1619 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1620 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1621 dsphys->ds_next_snap_obj = ds->ds_object; 1622 dsphys->ds_num_children = 1; 1623 dsphys->ds_creation_time = gethrestime_sec(); 1624 dsphys->ds_creation_txg = crtxg; 1625 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1626 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1627 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1628 dsphys->ds_uncompressed_bytes = 1629 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1630 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1631 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1632 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1633 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1634 dmu_buf_rele(dbuf, FTAG); 1635 1636 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1637 if (zfeature_active(f, ds->ds_feature[f])) { 1638 dsl_dataset_activate_feature(dsobj, f, 1639 ds->ds_feature[f], tx); 1640 } 1641 } 1642 1643 ASSERT3U(ds->ds_prev != 0, ==, 1644 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1645 if (ds->ds_prev) { 1646 uint64_t next_clones_obj = 1647 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1648 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1649 ds->ds_object || 1650 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1651 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1652 ds->ds_object) { 1653 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1654 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1655 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1656 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1657 } else if (next_clones_obj != 0) { 1658 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1659 dsphys->ds_next_snap_obj, tx); 1660 VERIFY0(zap_add_int(mos, 1661 next_clones_obj, dsobj, tx)); 1662 } 1663 } 1664 1665 /* 1666 * If we have a reference-reservation on this dataset, we will 1667 * need to increase the amount of refreservation being charged 1668 * since our unique space is going to zero. 1669 */ 1670 if (ds->ds_reserved) { 1671 int64_t delta; 1672 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1673 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1674 ds->ds_reserved); 1675 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1676 delta, 0, 0, tx); 1677 } 1678 1679 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1680 dsl_dataset_phys(ds)->ds_deadlist_obj = 1681 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1682 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1683 dsl_deadlist_close(&ds->ds_deadlist); 1684 dsl_deadlist_open(&ds->ds_deadlist, mos, 1685 dsl_dataset_phys(ds)->ds_deadlist_obj); 1686 dsl_deadlist_add_key(&ds->ds_deadlist, 1687 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1688 1689 if (dsl_dataset_remap_deadlist_exists(ds)) { 1690 uint64_t remap_deadlist_obj = 1691 dsl_dataset_get_remap_deadlist_object(ds); 1692 /* 1693 * Move the remap_deadlist to the snapshot. The head 1694 * will create a new remap deadlist on demand, from 1695 * dsl_dataset_block_remapped(). 1696 */ 1697 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1698 dsl_deadlist_close(&ds->ds_remap_deadlist); 1699 1700 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1701 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1702 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1703 } 1704 1705 /* 1706 * Create a ivset guid for this snapshot if the dataset is 1707 * encrypted. This may be overridden by a raw receive. A 1708 * previous implementation of this code did not have this 1709 * field as part of the on-disk format for ZFS encryption 1710 * (see errata #4). As part of the remediation for this 1711 * issue, we ask the user to enable the bookmark_v2 feature 1712 * which is now a dependency of the encryption feature. We 1713 * use this as a heuristic to determine when the user has 1714 * elected to correct any datasets created with the old code. 1715 * As a result, we only do this step if the bookmark_v2 1716 * feature is enabled, which limits the number of states a 1717 * given pool / dataset can be in with regards to terms of 1718 * correcting the issue. 1719 */ 1720 if (ds->ds_dir->dd_crypto_obj != 0 && 1721 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1722 uint64_t ivset_guid = unique_create(); 1723 1724 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1725 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1726 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1727 } 1728 1729 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1730 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1731 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1732 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1733 1734 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1735 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1736 1737 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1738 snapname, 8, 1, &dsobj, tx)); 1739 1740 if (ds->ds_prev) 1741 dsl_dataset_rele(ds->ds_prev, ds); 1742 VERIFY0(dsl_dataset_hold_obj(dp, 1743 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1744 1745 dsl_scan_ds_snapshotted(ds, tx); 1746 1747 dsl_dir_snap_cmtime_update(ds->ds_dir); 1748 1749 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1750 } 1751 1752 void 1753 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1754 { 1755 dsl_dataset_snapshot_arg_t *ddsa = arg; 1756 dsl_pool_t *dp = dmu_tx_pool(tx); 1757 nvpair_t *pair; 1758 1759 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1760 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1761 dsl_dataset_t *ds; 1762 char *name, *atp; 1763 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1764 1765 name = nvpair_name(pair); 1766 atp = strchr(name, '@'); 1767 (void) strlcpy(dsname, name, atp - name + 1); 1768 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1769 1770 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1771 if (ddsa->ddsa_props != NULL) { 1772 dsl_props_set_sync_impl(ds->ds_prev, 1773 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1774 } 1775 dsl_dataset_rele(ds, FTAG); 1776 } 1777 } 1778 1779 /* 1780 * The snapshots must all be in the same pool. 1781 * All-or-nothing: if there are any failures, nothing will be modified. 1782 */ 1783 int 1784 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1785 { 1786 dsl_dataset_snapshot_arg_t ddsa; 1787 nvpair_t *pair; 1788 boolean_t needsuspend; 1789 int error; 1790 spa_t *spa; 1791 char *firstname; 1792 nvlist_t *suspended = NULL; 1793 1794 pair = nvlist_next_nvpair(snaps, NULL); 1795 if (pair == NULL) 1796 return (0); 1797 firstname = nvpair_name(pair); 1798 1799 error = spa_open(firstname, &spa, FTAG); 1800 if (error != 0) 1801 return (error); 1802 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1803 spa_close(spa, FTAG); 1804 1805 if (needsuspend) { 1806 suspended = fnvlist_alloc(); 1807 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1808 pair = nvlist_next_nvpair(snaps, pair)) { 1809 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1810 char *snapname = nvpair_name(pair); 1811 char *atp; 1812 void *cookie; 1813 1814 atp = strchr(snapname, '@'); 1815 if (atp == NULL) { 1816 error = SET_ERROR(EINVAL); 1817 break; 1818 } 1819 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1820 1821 error = zil_suspend(fsname, &cookie); 1822 if (error != 0) 1823 break; 1824 fnvlist_add_uint64(suspended, fsname, 1825 (uintptr_t)cookie); 1826 } 1827 } 1828 1829 ddsa.ddsa_snaps = snaps; 1830 ddsa.ddsa_props = props; 1831 ddsa.ddsa_errors = errors; 1832 ddsa.ddsa_cr = CRED(); 1833 1834 if (error == 0) { 1835 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1836 dsl_dataset_snapshot_sync, &ddsa, 1837 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1838 } 1839 1840 if (suspended != NULL) { 1841 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1842 pair = nvlist_next_nvpair(suspended, pair)) { 1843 zil_resume((void *)(uintptr_t) 1844 fnvpair_value_uint64(pair)); 1845 } 1846 fnvlist_free(suspended); 1847 } 1848 1849 return (error); 1850 } 1851 1852 typedef struct dsl_dataset_snapshot_tmp_arg { 1853 const char *ddsta_fsname; 1854 const char *ddsta_snapname; 1855 minor_t ddsta_cleanup_minor; 1856 const char *ddsta_htag; 1857 } dsl_dataset_snapshot_tmp_arg_t; 1858 1859 static int 1860 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1861 { 1862 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1863 dsl_pool_t *dp = dmu_tx_pool(tx); 1864 dsl_dataset_t *ds; 1865 int error; 1866 1867 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1868 if (error != 0) 1869 return (error); 1870 1871 /* NULL cred means no limit check for tmp snapshot */ 1872 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1873 tx, B_FALSE, 0, NULL); 1874 if (error != 0) { 1875 dsl_dataset_rele(ds, FTAG); 1876 return (error); 1877 } 1878 1879 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1880 dsl_dataset_rele(ds, FTAG); 1881 return (SET_ERROR(ENOTSUP)); 1882 } 1883 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1884 B_TRUE, tx); 1885 if (error != 0) { 1886 dsl_dataset_rele(ds, FTAG); 1887 return (error); 1888 } 1889 1890 dsl_dataset_rele(ds, FTAG); 1891 return (0); 1892 } 1893 1894 static void 1895 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1896 { 1897 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1898 dsl_pool_t *dp = dmu_tx_pool(tx); 1899 dsl_dataset_t *ds; 1900 1901 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1902 1903 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1904 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1905 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1906 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1907 1908 dsl_dataset_rele(ds, FTAG); 1909 } 1910 1911 int 1912 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1913 minor_t cleanup_minor, const char *htag) 1914 { 1915 dsl_dataset_snapshot_tmp_arg_t ddsta; 1916 int error; 1917 spa_t *spa; 1918 boolean_t needsuspend; 1919 void *cookie; 1920 1921 ddsta.ddsta_fsname = fsname; 1922 ddsta.ddsta_snapname = snapname; 1923 ddsta.ddsta_cleanup_minor = cleanup_minor; 1924 ddsta.ddsta_htag = htag; 1925 1926 error = spa_open(fsname, &spa, FTAG); 1927 if (error != 0) 1928 return (error); 1929 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1930 spa_close(spa, FTAG); 1931 1932 if (needsuspend) { 1933 error = zil_suspend(fsname, &cookie); 1934 if (error != 0) 1935 return (error); 1936 } 1937 1938 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1939 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1940 1941 if (needsuspend) 1942 zil_resume(cookie); 1943 return (error); 1944 } 1945 1946 void 1947 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1948 { 1949 ASSERT(dmu_tx_is_syncing(tx)); 1950 ASSERT(ds->ds_objset != NULL); 1951 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1952 1953 /* 1954 * in case we had to change ds_fsid_guid when we opened it, 1955 * sync it out now. 1956 */ 1957 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1958 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1959 1960 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1961 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1962 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1963 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1964 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1965 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1966 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1967 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1968 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1969 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1970 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1971 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1972 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1973 } 1974 1975 dmu_objset_sync(ds->ds_objset, zio, tx); 1976 1977 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1978 if (zfeature_active(f, ds->ds_feature_activation[f])) { 1979 if (zfeature_active(f, ds->ds_feature[f])) 1980 continue; 1981 dsl_dataset_activate_feature(ds->ds_object, f, 1982 ds->ds_feature_activation[f], tx); 1983 ds->ds_feature[f] = ds->ds_feature_activation[f]; 1984 } 1985 } 1986 } 1987 1988 static int 1989 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 1990 { 1991 dsl_deadlist_t *dl = arg; 1992 dsl_deadlist_insert(dl, bp, tx); 1993 return (0); 1994 } 1995 1996 void 1997 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 1998 { 1999 objset_t *os = ds->ds_objset; 2000 2001 bplist_iterate(&ds->ds_pending_deadlist, 2002 deadlist_enqueue_cb, &ds->ds_deadlist, tx); 2003 2004 if (os->os_synced_dnodes != NULL) { 2005 multilist_destroy(os->os_synced_dnodes); 2006 os->os_synced_dnodes = NULL; 2007 } 2008 2009 if (os->os_encrypted) 2010 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 2011 else 2012 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 2013 2014 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 2015 2016 dmu_buf_rele(ds->ds_dbuf, ds); 2017 } 2018 2019 int 2020 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 2021 { 2022 uint64_t count = 0; 2023 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 2024 zap_cursor_t zc; 2025 zap_attribute_t za; 2026 2027 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 2028 2029 /* 2030 * There may be missing entries in ds_next_clones_obj 2031 * due to a bug in a previous version of the code. 2032 * Only trust it if it has the right number of entries. 2033 */ 2034 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 2035 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 2036 &count)); 2037 } 2038 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 2039 return (ENOENT); 2040 } 2041 for (zap_cursor_init(&zc, mos, 2042 dsl_dataset_phys(ds)->ds_next_clones_obj); 2043 zap_cursor_retrieve(&zc, &za) == 0; 2044 zap_cursor_advance(&zc)) { 2045 dsl_dataset_t *clone; 2046 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2047 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 2048 za.za_first_integer, FTAG, &clone)); 2049 dsl_dir_name(clone->ds_dir, buf); 2050 fnvlist_add_boolean(val, buf); 2051 dsl_dataset_rele(clone, FTAG); 2052 } 2053 zap_cursor_fini(&zc); 2054 return (0); 2055 } 2056 2057 void 2058 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 2059 { 2060 nvlist_t *propval = fnvlist_alloc(); 2061 nvlist_t *val; 2062 2063 /* 2064 * We use nvlist_alloc() instead of fnvlist_alloc() because the 2065 * latter would allocate the list with NV_UNIQUE_NAME flag. 2066 * As a result, every time a clone name is appended to the list 2067 * it would be (linearly) searched for for a duplicate name. 2068 * We already know that all clone names must be unique and we 2069 * want avoid the quadratic complexity of double-checking that 2070 * because we can have a large number of clones. 2071 */ 2072 VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP)); 2073 2074 if (get_clones_stat_impl(ds, val) == 0) { 2075 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 2076 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 2077 propval); 2078 } 2079 2080 nvlist_free(val); 2081 nvlist_free(propval); 2082 } 2083 2084 /* 2085 * Returns a string that represents the receive resume stats token. It should 2086 * be freed with strfree(). 2087 */ 2088 char * 2089 get_receive_resume_stats_impl(dsl_dataset_t *ds) 2090 { 2091 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2092 2093 if (dsl_dataset_has_resume_receive_state(ds)) { 2094 char *str; 2095 void *packed; 2096 uint8_t *compressed; 2097 uint64_t val; 2098 nvlist_t *token_nv = fnvlist_alloc(); 2099 size_t packed_size, compressed_size; 2100 2101 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2102 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 2103 fnvlist_add_uint64(token_nv, "fromguid", val); 2104 } 2105 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2106 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 2107 fnvlist_add_uint64(token_nv, "object", val); 2108 } 2109 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2110 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 2111 fnvlist_add_uint64(token_nv, "offset", val); 2112 } 2113 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2114 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 2115 fnvlist_add_uint64(token_nv, "bytes", val); 2116 } 2117 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2118 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 2119 fnvlist_add_uint64(token_nv, "toguid", val); 2120 } 2121 char buf[256]; 2122 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 2123 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 2124 fnvlist_add_string(token_nv, "toname", buf); 2125 } 2126 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2127 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 2128 fnvlist_add_boolean(token_nv, "largeblockok"); 2129 } 2130 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2131 DS_FIELD_RESUME_EMBEDOK) == 0) { 2132 fnvlist_add_boolean(token_nv, "embedok"); 2133 } 2134 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2135 DS_FIELD_RESUME_COMPRESSOK) == 0) { 2136 fnvlist_add_boolean(token_nv, "compressok"); 2137 } 2138 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 2139 DS_FIELD_RESUME_RAWOK) == 0) { 2140 fnvlist_add_boolean(token_nv, "rawok"); 2141 } 2142 packed = fnvlist_pack(token_nv, &packed_size); 2143 fnvlist_free(token_nv); 2144 compressed = kmem_alloc(packed_size, KM_SLEEP); 2145 2146 compressed_size = gzip_compress(packed, compressed, 2147 packed_size, packed_size, 6); 2148 2149 zio_cksum_t cksum; 2150 fletcher_4_native_varsize(compressed, compressed_size, &cksum); 2151 2152 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 2153 for (int i = 0; i < compressed_size; i++) { 2154 (void) sprintf(str + i * 2, "%02x", compressed[i]); 2155 } 2156 str[compressed_size * 2] = '\0'; 2157 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2158 ZFS_SEND_RESUME_TOKEN_VERSION, 2159 (longlong_t)cksum.zc_word[0], 2160 (longlong_t)packed_size, str); 2161 kmem_free(packed, packed_size); 2162 kmem_free(str, compressed_size * 2 + 1); 2163 kmem_free(compressed, packed_size); 2164 return (propval); 2165 } 2166 return (strdup("")); 2167 } 2168 2169 /* 2170 * Returns a string that represents the receive resume stats token of the 2171 * dataset's child. It should be freed with strfree(). 2172 */ 2173 char * 2174 get_child_receive_stats(dsl_dataset_t *ds) 2175 { 2176 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 2177 dsl_dataset_t *recv_ds; 2178 dsl_dataset_name(ds, recvname); 2179 if (strlcat(recvname, "/", sizeof (recvname)) < 2180 sizeof (recvname) && 2181 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2182 sizeof (recvname) && 2183 dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG, 2184 &recv_ds) == 0) { 2185 char *propval = get_receive_resume_stats_impl(recv_ds); 2186 dsl_dataset_rele(recv_ds, FTAG); 2187 return (propval); 2188 } 2189 return (strdup("")); 2190 } 2191 2192 static void 2193 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 2194 { 2195 char *propval = get_receive_resume_stats_impl(ds); 2196 if (strcmp(propval, "") != 0) { 2197 dsl_prop_nvlist_add_string(nv, 2198 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 2199 } else { 2200 char *childval = get_child_receive_stats(ds); 2201 if (strcmp(childval, "") != 0) { 2202 dsl_prop_nvlist_add_string(nv, 2203 ZFS_PROP_RECEIVE_RESUME_TOKEN, childval); 2204 } 2205 strfree(childval); 2206 } 2207 strfree(propval); 2208 } 2209 2210 uint64_t 2211 dsl_get_refratio(dsl_dataset_t *ds) 2212 { 2213 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2214 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2215 dsl_dataset_phys(ds)->ds_compressed_bytes); 2216 return (ratio); 2217 } 2218 2219 uint64_t 2220 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2221 { 2222 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2223 } 2224 2225 uint64_t 2226 dsl_get_compressratio(dsl_dataset_t *ds) 2227 { 2228 if (ds->ds_is_snapshot) { 2229 return (dsl_get_refratio(ds)); 2230 } else { 2231 dsl_dir_t *dd = ds->ds_dir; 2232 mutex_enter(&dd->dd_lock); 2233 uint64_t val = dsl_dir_get_compressratio(dd); 2234 mutex_exit(&dd->dd_lock); 2235 return (val); 2236 } 2237 } 2238 2239 uint64_t 2240 dsl_get_used(dsl_dataset_t *ds) 2241 { 2242 if (ds->ds_is_snapshot) { 2243 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2244 } else { 2245 dsl_dir_t *dd = ds->ds_dir; 2246 mutex_enter(&dd->dd_lock); 2247 uint64_t val = dsl_dir_get_used(dd); 2248 mutex_exit(&dd->dd_lock); 2249 return (val); 2250 } 2251 } 2252 2253 uint64_t 2254 dsl_get_creation(dsl_dataset_t *ds) 2255 { 2256 return (dsl_dataset_phys(ds)->ds_creation_time); 2257 } 2258 2259 uint64_t 2260 dsl_get_creationtxg(dsl_dataset_t *ds) 2261 { 2262 return (dsl_dataset_phys(ds)->ds_creation_txg); 2263 } 2264 2265 uint64_t 2266 dsl_get_refquota(dsl_dataset_t *ds) 2267 { 2268 return (ds->ds_quota); 2269 } 2270 2271 uint64_t 2272 dsl_get_refreservation(dsl_dataset_t *ds) 2273 { 2274 return (ds->ds_reserved); 2275 } 2276 2277 uint64_t 2278 dsl_get_guid(dsl_dataset_t *ds) 2279 { 2280 return (dsl_dataset_phys(ds)->ds_guid); 2281 } 2282 2283 uint64_t 2284 dsl_get_unique(dsl_dataset_t *ds) 2285 { 2286 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2287 } 2288 2289 uint64_t 2290 dsl_get_objsetid(dsl_dataset_t *ds) 2291 { 2292 return (ds->ds_object); 2293 } 2294 2295 uint64_t 2296 dsl_get_userrefs(dsl_dataset_t *ds) 2297 { 2298 return (ds->ds_userrefs); 2299 } 2300 2301 uint64_t 2302 dsl_get_defer_destroy(dsl_dataset_t *ds) 2303 { 2304 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2305 } 2306 2307 uint64_t 2308 dsl_get_referenced(dsl_dataset_t *ds) 2309 { 2310 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2311 } 2312 2313 uint64_t 2314 dsl_get_numclones(dsl_dataset_t *ds) 2315 { 2316 ASSERT(ds->ds_is_snapshot); 2317 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2318 } 2319 2320 uint64_t 2321 dsl_get_inconsistent(dsl_dataset_t *ds) 2322 { 2323 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2324 1 : 0); 2325 } 2326 2327 uint64_t 2328 dsl_get_available(dsl_dataset_t *ds) 2329 { 2330 uint64_t refdbytes = dsl_get_referenced(ds); 2331 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2332 NULL, 0, TRUE); 2333 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2334 availbytes += 2335 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2336 } 2337 if (ds->ds_quota != 0) { 2338 /* 2339 * Adjust available bytes according to refquota 2340 */ 2341 if (refdbytes < ds->ds_quota) { 2342 availbytes = MIN(availbytes, 2343 ds->ds_quota - refdbytes); 2344 } else { 2345 availbytes = 0; 2346 } 2347 } 2348 return (availbytes); 2349 } 2350 2351 int 2352 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2353 { 2354 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2355 dsl_dataset_t *prev; 2356 int err = dsl_dataset_hold_obj(dp, 2357 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2358 if (err == 0) { 2359 uint64_t comp, uncomp; 2360 err = dsl_dataset_space_written(prev, ds, written, 2361 &comp, &uncomp); 2362 dsl_dataset_rele(prev, FTAG); 2363 } 2364 return (err); 2365 } 2366 2367 /* 2368 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2369 */ 2370 int 2371 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2372 { 2373 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2374 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2375 dsl_dataset_name(ds->ds_prev, snap); 2376 return (0); 2377 } else { 2378 return (ENOENT); 2379 } 2380 } 2381 2382 /* 2383 * Returns the mountpoint property and source for the given dataset in the value 2384 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2385 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2386 * Returns 0 on success and an error on failure. 2387 */ 2388 int 2389 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2390 char *source) 2391 { 2392 int error; 2393 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2394 2395 /* Retrieve the mountpoint value stored in the zap opbject */ 2396 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2397 ZAP_MAXVALUELEN, value, source); 2398 if (error != 0) { 2399 return (error); 2400 } 2401 2402 /* 2403 * Process the dsname and source to find the full mountpoint string. 2404 * Can be skipped for 'legacy' or 'none'. 2405 */ 2406 if (value[0] == '/') { 2407 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2408 char *root = buf; 2409 const char *relpath; 2410 2411 /* 2412 * If we inherit the mountpoint, even from a dataset 2413 * with a received value, the source will be the path of 2414 * the dataset we inherit from. If source is 2415 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2416 * inherited. 2417 */ 2418 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2419 relpath = ""; 2420 } else { 2421 ASSERT0(strncmp(dsname, source, strlen(source))); 2422 relpath = dsname + strlen(source); 2423 if (relpath[0] == '/') 2424 relpath++; 2425 } 2426 2427 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2428 2429 /* 2430 * Special case an alternate root of '/'. This will 2431 * avoid having multiple leading slashes in the 2432 * mountpoint path. 2433 */ 2434 if (strcmp(root, "/") == 0) 2435 root++; 2436 2437 /* 2438 * If the mountpoint is '/' then skip over this 2439 * if we are obtaining either an alternate root or 2440 * an inherited mountpoint. 2441 */ 2442 char *mnt = value; 2443 if (value[1] == '\0' && (root[0] != '\0' || 2444 relpath[0] != '\0')) 2445 mnt = value + 1; 2446 2447 if (relpath[0] == '\0') { 2448 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2449 root, mnt); 2450 } else { 2451 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2452 root, mnt, relpath[0] == '@' ? "" : "/", 2453 relpath); 2454 } 2455 kmem_free(buf, ZAP_MAXVALUELEN); 2456 } 2457 2458 return (0); 2459 } 2460 2461 void 2462 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2463 { 2464 int err; 2465 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2466 2467 ASSERT(dsl_pool_config_held(dp)); 2468 2469 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2470 dsl_get_refratio(ds)); 2471 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2472 dsl_get_logicalreferenced(ds)); 2473 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2474 dsl_get_compressratio(ds)); 2475 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2476 dsl_get_used(ds)); 2477 2478 if (ds->ds_is_snapshot) { 2479 get_clones_stat(ds, nv); 2480 } else { 2481 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2482 if (dsl_get_prev_snap(ds, buf) == 0) 2483 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2484 buf); 2485 dsl_dir_stats(ds->ds_dir, nv); 2486 } 2487 2488 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2489 dsl_get_available(ds)); 2490 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2491 dsl_get_referenced(ds)); 2492 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2493 dsl_get_creation(ds)); 2494 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2495 dsl_get_creationtxg(ds)); 2496 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2497 dsl_get_refquota(ds)); 2498 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2499 dsl_get_refreservation(ds)); 2500 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2501 dsl_get_guid(ds)); 2502 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2503 dsl_get_unique(ds)); 2504 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2505 dsl_get_objsetid(ds)); 2506 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2507 dsl_get_userrefs(ds)); 2508 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2509 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2510 dsl_dataset_crypt_stats(ds, nv); 2511 2512 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2513 uint64_t written, comp, uncomp; 2514 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2515 dsl_dataset_t *prev; 2516 2517 err = dsl_dataset_hold_obj(dp, 2518 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2519 if (err == 0) { 2520 err = dsl_dataset_space_written(prev, ds, &written, 2521 &comp, &uncomp); 2522 dsl_dataset_rele(prev, FTAG); 2523 if (err == 0) { 2524 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2525 written); 2526 } 2527 } 2528 } 2529 2530 if (!dsl_dataset_is_snapshot(ds)) { 2531 /* 2532 * A failed "newfs" (e.g. full) resumable receive leaves 2533 * the stats set on this dataset. Check here for the prop. 2534 */ 2535 get_receive_resume_stats(ds, nv); 2536 2537 /* 2538 * A failed incremental resumable receive leaves the 2539 * stats set on our child named "%recv". Check the child 2540 * for the prop. 2541 */ 2542 /* 6 extra bytes for /%recv */ 2543 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 2544 dsl_dataset_t *recv_ds; 2545 dsl_dataset_name(ds, recvname); 2546 if (strlcat(recvname, "/", sizeof (recvname)) < 2547 sizeof (recvname) && 2548 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2549 sizeof (recvname) && 2550 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 2551 get_receive_resume_stats(recv_ds, nv); 2552 dsl_dataset_rele(recv_ds, FTAG); 2553 } 2554 } 2555 } 2556 2557 void 2558 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2559 { 2560 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2561 ASSERT(dsl_pool_config_held(dp)); 2562 2563 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2564 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2565 stat->dds_guid = dsl_get_guid(ds); 2566 stat->dds_origin[0] = '\0'; 2567 if (ds->ds_is_snapshot) { 2568 stat->dds_is_snapshot = B_TRUE; 2569 stat->dds_num_clones = dsl_get_numclones(ds); 2570 } else { 2571 stat->dds_is_snapshot = B_FALSE; 2572 stat->dds_num_clones = 0; 2573 2574 if (dsl_dir_is_clone(ds->ds_dir)) { 2575 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2576 } 2577 } 2578 } 2579 2580 uint64_t 2581 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2582 { 2583 return (ds->ds_fsid_guid); 2584 } 2585 2586 void 2587 dsl_dataset_space(dsl_dataset_t *ds, 2588 uint64_t *refdbytesp, uint64_t *availbytesp, 2589 uint64_t *usedobjsp, uint64_t *availobjsp) 2590 { 2591 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2592 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2593 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2594 *availbytesp += 2595 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2596 if (ds->ds_quota != 0) { 2597 /* 2598 * Adjust available bytes according to refquota 2599 */ 2600 if (*refdbytesp < ds->ds_quota) 2601 *availbytesp = MIN(*availbytesp, 2602 ds->ds_quota - *refdbytesp); 2603 else 2604 *availbytesp = 0; 2605 } 2606 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2607 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2608 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2609 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2610 } 2611 2612 boolean_t 2613 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2614 { 2615 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2616 uint64_t birth; 2617 2618 ASSERT(dsl_pool_config_held(dp)); 2619 if (snap == NULL) 2620 return (B_FALSE); 2621 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2622 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2623 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2624 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2625 objset_t *os, *os_snap; 2626 /* 2627 * It may be that only the ZIL differs, because it was 2628 * reset in the head. Don't count that as being 2629 * modified. 2630 */ 2631 if (dmu_objset_from_ds(ds, &os) != 0) 2632 return (B_TRUE); 2633 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2634 return (B_TRUE); 2635 return (bcmp(&os->os_phys->os_meta_dnode, 2636 &os_snap->os_phys->os_meta_dnode, 2637 sizeof (os->os_phys->os_meta_dnode)) != 0); 2638 } 2639 return (B_FALSE); 2640 } 2641 2642 typedef struct dsl_dataset_rename_snapshot_arg { 2643 const char *ddrsa_fsname; 2644 const char *ddrsa_oldsnapname; 2645 const char *ddrsa_newsnapname; 2646 boolean_t ddrsa_recursive; 2647 dmu_tx_t *ddrsa_tx; 2648 } dsl_dataset_rename_snapshot_arg_t; 2649 2650 /* ARGSUSED */ 2651 static int 2652 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2653 dsl_dataset_t *hds, void *arg) 2654 { 2655 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2656 int error; 2657 uint64_t val; 2658 2659 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2660 if (error != 0) { 2661 /* ignore nonexistent snapshots */ 2662 return (error == ENOENT ? 0 : error); 2663 } 2664 2665 /* new name should not exist */ 2666 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2667 if (error == 0) 2668 error = SET_ERROR(EEXIST); 2669 else if (error == ENOENT) 2670 error = 0; 2671 2672 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2673 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2674 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2675 error = SET_ERROR(ENAMETOOLONG); 2676 2677 return (error); 2678 } 2679 2680 static int 2681 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2682 { 2683 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2684 dsl_pool_t *dp = dmu_tx_pool(tx); 2685 dsl_dataset_t *hds; 2686 int error; 2687 2688 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2689 if (error != 0) 2690 return (error); 2691 2692 if (ddrsa->ddrsa_recursive) { 2693 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2694 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2695 DS_FIND_CHILDREN); 2696 } else { 2697 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2698 } 2699 dsl_dataset_rele(hds, FTAG); 2700 return (error); 2701 } 2702 2703 static int 2704 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2705 dsl_dataset_t *hds, void *arg) 2706 { 2707 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2708 dsl_dataset_t *ds; 2709 uint64_t val; 2710 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2711 int error; 2712 2713 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2714 ASSERT(error == 0 || error == ENOENT); 2715 if (error == ENOENT) { 2716 /* ignore nonexistent snapshots */ 2717 return (0); 2718 } 2719 2720 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2721 2722 /* log before we change the name */ 2723 spa_history_log_internal_ds(ds, "rename", tx, 2724 "-> @%s", ddrsa->ddrsa_newsnapname); 2725 2726 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2727 B_FALSE)); 2728 mutex_enter(&ds->ds_lock); 2729 (void) strlcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname, 2730 sizeof (ds->ds_snapname)); 2731 mutex_exit(&ds->ds_lock); 2732 VERIFY0(zap_add(dp->dp_meta_objset, 2733 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2734 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2735 2736 dsl_dataset_rele(ds, FTAG); 2737 return (0); 2738 } 2739 2740 static void 2741 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2742 { 2743 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2744 dsl_pool_t *dp = dmu_tx_pool(tx); 2745 dsl_dataset_t *hds; 2746 2747 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2748 ddrsa->ddrsa_tx = tx; 2749 if (ddrsa->ddrsa_recursive) { 2750 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2751 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2752 DS_FIND_CHILDREN)); 2753 } else { 2754 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2755 } 2756 dsl_dataset_rele(hds, FTAG); 2757 } 2758 2759 int 2760 dsl_dataset_rename_snapshot(const char *fsname, 2761 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2762 { 2763 dsl_dataset_rename_snapshot_arg_t ddrsa; 2764 2765 ddrsa.ddrsa_fsname = fsname; 2766 ddrsa.ddrsa_oldsnapname = oldsnapname; 2767 ddrsa.ddrsa_newsnapname = newsnapname; 2768 ddrsa.ddrsa_recursive = recursive; 2769 2770 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2771 dsl_dataset_rename_snapshot_sync, &ddrsa, 2772 1, ZFS_SPACE_CHECK_RESERVED)); 2773 } 2774 2775 /* 2776 * If we're doing an ownership handoff, we need to make sure that there is 2777 * only one long hold on the dataset. We're not allowed to change anything here 2778 * so we don't permanently release the long hold or regular hold here. We want 2779 * to do this only when syncing to avoid the dataset unexpectedly going away 2780 * when we release the long hold. 2781 */ 2782 static int 2783 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2784 { 2785 boolean_t held; 2786 2787 if (!dmu_tx_is_syncing(tx)) 2788 return (0); 2789 2790 if (owner != NULL) { 2791 VERIFY3P(ds->ds_owner, ==, owner); 2792 dsl_dataset_long_rele(ds, owner); 2793 } 2794 2795 held = dsl_dataset_long_held(ds); 2796 2797 if (owner != NULL) 2798 dsl_dataset_long_hold(ds, owner); 2799 2800 if (held) 2801 return (SET_ERROR(EBUSY)); 2802 2803 return (0); 2804 } 2805 2806 int 2807 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2808 { 2809 dsl_dataset_rollback_arg_t *ddra = arg; 2810 dsl_pool_t *dp = dmu_tx_pool(tx); 2811 dsl_dataset_t *ds; 2812 int64_t unused_refres_delta; 2813 int error; 2814 2815 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2816 if (error != 0) 2817 return (error); 2818 2819 /* must not be a snapshot */ 2820 if (ds->ds_is_snapshot) { 2821 dsl_dataset_rele(ds, FTAG); 2822 return (SET_ERROR(EINVAL)); 2823 } 2824 2825 /* must have a most recent snapshot */ 2826 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2827 dsl_dataset_rele(ds, FTAG); 2828 return (SET_ERROR(ESRCH)); 2829 } 2830 2831 /* 2832 * No rollback to a snapshot created in the current txg, because 2833 * the rollback may dirty the dataset and create blocks that are 2834 * not reachable from the rootbp while having a birth txg that 2835 * falls into the snapshot's range. 2836 */ 2837 if (dmu_tx_is_syncing(tx) && 2838 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 2839 dsl_dataset_rele(ds, FTAG); 2840 return (SET_ERROR(EAGAIN)); 2841 } 2842 2843 /* 2844 * If the expected target snapshot is specified, then check that 2845 * the latest snapshot is it. 2846 */ 2847 if (ddra->ddra_tosnap != NULL) { 2848 dsl_dataset_t *snapds; 2849 2850 /* Check if the target snapshot exists at all. */ 2851 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 2852 if (error != 0) { 2853 /* 2854 * ESRCH is used to signal that the target snapshot does 2855 * not exist, while ENOENT is used to report that 2856 * the rolled back dataset does not exist. 2857 * ESRCH is also used to cover other cases where the 2858 * target snapshot is not related to the dataset being 2859 * rolled back such as being in a different pool. 2860 */ 2861 if (error == ENOENT || error == EXDEV) 2862 error = SET_ERROR(ESRCH); 2863 dsl_dataset_rele(ds, FTAG); 2864 return (error); 2865 } 2866 ASSERT(snapds->ds_is_snapshot); 2867 2868 /* Check if the snapshot is the latest snapshot indeed. */ 2869 if (snapds != ds->ds_prev) { 2870 /* 2871 * Distinguish between the case where the only problem 2872 * is intervening snapshots (EEXIST) vs the snapshot 2873 * not being a valid target for rollback (ESRCH). 2874 */ 2875 if (snapds->ds_dir == ds->ds_dir || 2876 (dsl_dir_is_clone(ds->ds_dir) && 2877 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 2878 snapds->ds_object)) { 2879 error = SET_ERROR(EEXIST); 2880 } else { 2881 error = SET_ERROR(ESRCH); 2882 } 2883 dsl_dataset_rele(snapds, FTAG); 2884 dsl_dataset_rele(ds, FTAG); 2885 return (error); 2886 } 2887 dsl_dataset_rele(snapds, FTAG); 2888 } 2889 2890 /* must not have any bookmarks after the most recent snapshot */ 2891 nvlist_t *proprequest = fnvlist_alloc(); 2892 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2893 nvlist_t *bookmarks = fnvlist_alloc(); 2894 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2895 fnvlist_free(proprequest); 2896 if (error != 0) { 2897 dsl_dataset_rele(ds, FTAG); 2898 return (error); 2899 } 2900 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2901 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2902 nvlist_t *valuenv = 2903 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2904 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2905 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2906 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2907 fnvlist_free(bookmarks); 2908 dsl_dataset_rele(ds, FTAG); 2909 return (SET_ERROR(EEXIST)); 2910 } 2911 } 2912 fnvlist_free(bookmarks); 2913 2914 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2915 if (error != 0) { 2916 dsl_dataset_rele(ds, FTAG); 2917 return (error); 2918 } 2919 2920 /* 2921 * Check if the snap we are rolling back to uses more than 2922 * the refquota. 2923 */ 2924 if (ds->ds_quota != 0 && 2925 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2926 dsl_dataset_rele(ds, FTAG); 2927 return (SET_ERROR(EDQUOT)); 2928 } 2929 2930 /* 2931 * When we do the clone swap, we will temporarily use more space 2932 * due to the refreservation (the head will no longer have any 2933 * unique space, so the entire amount of the refreservation will need 2934 * to be free). We will immediately destroy the clone, freeing 2935 * this space, but the freeing happens over many txg's. 2936 */ 2937 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2938 dsl_dataset_phys(ds)->ds_unique_bytes); 2939 2940 if (unused_refres_delta > 0 && 2941 unused_refres_delta > 2942 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2943 dsl_dataset_rele(ds, FTAG); 2944 return (SET_ERROR(ENOSPC)); 2945 } 2946 2947 dsl_dataset_rele(ds, FTAG); 2948 return (0); 2949 } 2950 2951 void 2952 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2953 { 2954 dsl_dataset_rollback_arg_t *ddra = arg; 2955 dsl_pool_t *dp = dmu_tx_pool(tx); 2956 dsl_dataset_t *ds, *clone; 2957 uint64_t cloneobj; 2958 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2959 2960 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2961 2962 dsl_dataset_name(ds->ds_prev, namebuf); 2963 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2964 2965 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2966 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 2967 2968 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2969 2970 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2971 dsl_dataset_zero_zil(ds, tx); 2972 2973 dsl_destroy_head_sync_impl(clone, tx); 2974 2975 dsl_dataset_rele(clone, FTAG); 2976 dsl_dataset_rele(ds, FTAG); 2977 } 2978 2979 /* 2980 * Rolls back the given filesystem or volume to the most recent snapshot. 2981 * The name of the most recent snapshot will be returned under key "target" 2982 * in the result nvlist. 2983 * 2984 * If owner != NULL: 2985 * - The existing dataset MUST be owned by the specified owner at entry 2986 * - Upon return, dataset will still be held by the same owner, whether we 2987 * succeed or not. 2988 * 2989 * This mode is required any time the existing filesystem is mounted. See 2990 * notes above zfs_suspend_fs() for further details. 2991 */ 2992 int 2993 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 2994 nvlist_t *result) 2995 { 2996 dsl_dataset_rollback_arg_t ddra; 2997 2998 ddra.ddra_fsname = fsname; 2999 ddra.ddra_tosnap = tosnap; 3000 ddra.ddra_owner = owner; 3001 ddra.ddra_result = result; 3002 3003 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 3004 dsl_dataset_rollback_sync, &ddra, 3005 1, ZFS_SPACE_CHECK_RESERVED)); 3006 } 3007 3008 struct promotenode { 3009 list_node_t link; 3010 dsl_dataset_t *ds; 3011 }; 3012 3013 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 3014 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 3015 void *tag); 3016 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 3017 3018 int 3019 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 3020 { 3021 dsl_dataset_promote_arg_t *ddpa = arg; 3022 dsl_pool_t *dp = dmu_tx_pool(tx); 3023 dsl_dataset_t *hds; 3024 struct promotenode *snap; 3025 dsl_dataset_t *origin_ds; 3026 int err; 3027 uint64_t unused; 3028 uint64_t ss_mv_cnt; 3029 size_t max_snap_len; 3030 boolean_t conflicting_snaps; 3031 3032 err = promote_hold(ddpa, dp, FTAG); 3033 if (err != 0) 3034 return (err); 3035 3036 hds = ddpa->ddpa_clone; 3037 snap = list_head(&ddpa->shared_snaps); 3038 origin_ds = snap->ds; 3039 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 3040 3041 snap = list_head(&ddpa->origin_snaps); 3042 3043 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 3044 promote_rele(ddpa, FTAG); 3045 return (SET_ERROR(EXDEV)); 3046 } 3047 3048 snap = list_head(&ddpa->shared_snaps); 3049 if (snap == NULL) { 3050 err = SET_ERROR(ENOENT); 3051 goto out; 3052 } 3053 origin_ds = snap->ds; 3054 3055 /* 3056 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 3057 * When doing a promote we must make sure the encryption root for 3058 * both the target and the target's origin does not change to avoid 3059 * needing to rewrap encryption keys 3060 */ 3061 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 3062 if (err != 0) 3063 goto out; 3064 3065 /* 3066 * Compute and check the amount of space to transfer. Since this is 3067 * so expensive, don't do the preliminary check. 3068 */ 3069 if (!dmu_tx_is_syncing(tx)) { 3070 promote_rele(ddpa, FTAG); 3071 return (0); 3072 } 3073 3074 /* compute origin's new unique space */ 3075 snap = list_tail(&ddpa->clone_snaps); 3076 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3077 origin_ds->ds_object); 3078 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3079 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 3080 &ddpa->unique, &unused, &unused); 3081 3082 /* 3083 * Walk the snapshots that we are moving 3084 * 3085 * Compute space to transfer. Consider the incremental changes 3086 * to used by each snapshot: 3087 * (my used) = (prev's used) + (blocks born) - (blocks killed) 3088 * So each snapshot gave birth to: 3089 * (blocks born) = (my used) - (prev's used) + (blocks killed) 3090 * So a sequence would look like: 3091 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 3092 * Which simplifies to: 3093 * uN + kN + kN-1 + ... + k1 + k0 3094 * Note however, if we stop before we reach the ORIGIN we get: 3095 * uN + kN + kN-1 + ... + kM - uM-1 3096 */ 3097 conflicting_snaps = B_FALSE; 3098 ss_mv_cnt = 0; 3099 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 3100 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 3101 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 3102 for (snap = list_head(&ddpa->shared_snaps); snap; 3103 snap = list_next(&ddpa->shared_snaps, snap)) { 3104 uint64_t val, dlused, dlcomp, dluncomp; 3105 dsl_dataset_t *ds = snap->ds; 3106 3107 ss_mv_cnt++; 3108 3109 /* 3110 * If there are long holds, we won't be able to evict 3111 * the objset. 3112 */ 3113 if (dsl_dataset_long_held(ds)) { 3114 err = SET_ERROR(EBUSY); 3115 goto out; 3116 } 3117 3118 /* Check that the snapshot name does not conflict */ 3119 VERIFY0(dsl_dataset_get_snapname(ds)); 3120 if (strlen(ds->ds_snapname) >= max_snap_len) { 3121 err = SET_ERROR(ENAMETOOLONG); 3122 goto out; 3123 } 3124 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 3125 if (err == 0) { 3126 fnvlist_add_boolean(ddpa->err_ds, 3127 snap->ds->ds_snapname); 3128 conflicting_snaps = B_TRUE; 3129 } else if (err != ENOENT) { 3130 goto out; 3131 } 3132 3133 /* The very first snapshot does not have a deadlist */ 3134 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 3135 continue; 3136 3137 dsl_deadlist_space(&ds->ds_deadlist, 3138 &dlused, &dlcomp, &dluncomp); 3139 ddpa->used += dlused; 3140 ddpa->comp += dlcomp; 3141 ddpa->uncomp += dluncomp; 3142 } 3143 3144 /* 3145 * In order to return the full list of conflicting snapshots, we check 3146 * whether there was a conflict after traversing all of them. 3147 */ 3148 if (conflicting_snaps) { 3149 err = SET_ERROR(EEXIST); 3150 goto out; 3151 } 3152 3153 /* 3154 * If we are a clone of a clone then we never reached ORIGIN, 3155 * so we need to subtract out the clone origin's used space. 3156 */ 3157 if (ddpa->origin_origin) { 3158 ddpa->used -= 3159 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3160 ddpa->comp -= 3161 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3162 ddpa->uncomp -= 3163 dsl_dataset_phys(ddpa->origin_origin)-> 3164 ds_uncompressed_bytes; 3165 } 3166 3167 /* Check that there is enough space and limit headroom here */ 3168 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3169 0, ss_mv_cnt, ddpa->used, ddpa->cr); 3170 if (err != 0) 3171 goto out; 3172 3173 /* 3174 * Compute the amounts of space that will be used by snapshots 3175 * after the promotion (for both origin and clone). For each, 3176 * it is the amount of space that will be on all of their 3177 * deadlists (that was not born before their new origin). 3178 */ 3179 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3180 uint64_t space; 3181 3182 /* 3183 * Note, typically this will not be a clone of a clone, 3184 * so dd_origin_txg will be < TXG_INITIAL, so 3185 * these snaplist_space() -> dsl_deadlist_space_range() 3186 * calls will be fast because they do not have to 3187 * iterate over all bps. 3188 */ 3189 snap = list_head(&ddpa->origin_snaps); 3190 err = snaplist_space(&ddpa->shared_snaps, 3191 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3192 if (err != 0) 3193 goto out; 3194 3195 err = snaplist_space(&ddpa->clone_snaps, 3196 snap->ds->ds_dir->dd_origin_txg, &space); 3197 if (err != 0) 3198 goto out; 3199 ddpa->cloneusedsnap += space; 3200 } 3201 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3202 DD_FLAG_USED_BREAKDOWN) { 3203 err = snaplist_space(&ddpa->origin_snaps, 3204 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3205 &ddpa->originusedsnap); 3206 if (err != 0) 3207 goto out; 3208 } 3209 3210 out: 3211 promote_rele(ddpa, FTAG); 3212 return (err); 3213 } 3214 3215 void 3216 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3217 { 3218 dsl_dataset_promote_arg_t *ddpa = arg; 3219 dsl_pool_t *dp = dmu_tx_pool(tx); 3220 dsl_dataset_t *hds; 3221 struct promotenode *snap; 3222 dsl_dataset_t *origin_ds; 3223 dsl_dataset_t *origin_head; 3224 dsl_dir_t *dd; 3225 dsl_dir_t *odd = NULL; 3226 uint64_t oldnext_obj; 3227 int64_t delta; 3228 3229 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3230 hds = ddpa->ddpa_clone; 3231 3232 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3233 3234 snap = list_head(&ddpa->shared_snaps); 3235 origin_ds = snap->ds; 3236 dd = hds->ds_dir; 3237 3238 snap = list_head(&ddpa->origin_snaps); 3239 origin_head = snap->ds; 3240 3241 /* 3242 * We need to explicitly open odd, since origin_ds's dd will be 3243 * changing. 3244 */ 3245 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3246 NULL, FTAG, &odd)); 3247 3248 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3249 3250 /* change origin's next snap */ 3251 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3252 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3253 snap = list_tail(&ddpa->clone_snaps); 3254 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3255 origin_ds->ds_object); 3256 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3257 3258 /* change the origin's next clone */ 3259 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3260 dsl_dataset_remove_from_next_clones(origin_ds, 3261 snap->ds->ds_object, tx); 3262 VERIFY0(zap_add_int(dp->dp_meta_objset, 3263 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3264 oldnext_obj, tx)); 3265 } 3266 3267 /* change origin */ 3268 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3269 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3270 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3271 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3272 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3273 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3274 origin_head->ds_dir->dd_origin_txg = 3275 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3276 3277 /* change dd_clone entries */ 3278 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3279 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3280 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3281 VERIFY0(zap_add_int(dp->dp_meta_objset, 3282 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3283 hds->ds_object, tx)); 3284 3285 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3286 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3287 origin_head->ds_object, tx)); 3288 if (dsl_dir_phys(dd)->dd_clones == 0) { 3289 dsl_dir_phys(dd)->dd_clones = 3290 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3291 DMU_OT_NONE, 0, tx); 3292 } 3293 VERIFY0(zap_add_int(dp->dp_meta_objset, 3294 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3295 } 3296 3297 /* move snapshots to this dir */ 3298 for (snap = list_head(&ddpa->shared_snaps); snap; 3299 snap = list_next(&ddpa->shared_snaps, snap)) { 3300 dsl_dataset_t *ds = snap->ds; 3301 3302 /* 3303 * Property callbacks are registered to a particular 3304 * dsl_dir. Since ours is changing, evict the objset 3305 * so that they will be unregistered from the old dsl_dir. 3306 */ 3307 if (ds->ds_objset) { 3308 dmu_objset_evict(ds->ds_objset); 3309 ds->ds_objset = NULL; 3310 } 3311 3312 /* move snap name entry */ 3313 VERIFY0(dsl_dataset_get_snapname(ds)); 3314 VERIFY0(dsl_dataset_snap_remove(origin_head, 3315 ds->ds_snapname, tx, B_TRUE)); 3316 VERIFY0(zap_add(dp->dp_meta_objset, 3317 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3318 8, 1, &ds->ds_object, tx)); 3319 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3320 DD_FIELD_SNAPSHOT_COUNT, tx); 3321 3322 /* change containing dsl_dir */ 3323 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3324 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3325 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3326 ASSERT3P(ds->ds_dir, ==, odd); 3327 dsl_dir_rele(ds->ds_dir, ds); 3328 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3329 NULL, ds, &ds->ds_dir)); 3330 3331 /* move any clone references */ 3332 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3333 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3334 zap_cursor_t zc; 3335 zap_attribute_t za; 3336 3337 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3338 dsl_dataset_phys(ds)->ds_next_clones_obj); 3339 zap_cursor_retrieve(&zc, &za) == 0; 3340 zap_cursor_advance(&zc)) { 3341 dsl_dataset_t *cnds; 3342 uint64_t o; 3343 3344 if (za.za_first_integer == oldnext_obj) { 3345 /* 3346 * We've already moved the 3347 * origin's reference. 3348 */ 3349 continue; 3350 } 3351 3352 VERIFY0(dsl_dataset_hold_obj(dp, 3353 za.za_first_integer, FTAG, &cnds)); 3354 o = dsl_dir_phys(cnds->ds_dir)-> 3355 dd_head_dataset_obj; 3356 3357 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3358 dsl_dir_phys(odd)->dd_clones, o, tx)); 3359 VERIFY0(zap_add_int(dp->dp_meta_objset, 3360 dsl_dir_phys(dd)->dd_clones, o, tx)); 3361 dsl_dataset_rele(cnds, FTAG); 3362 } 3363 zap_cursor_fini(&zc); 3364 } 3365 3366 ASSERT(!dsl_prop_hascb(ds)); 3367 } 3368 3369 /* 3370 * Change space accounting. 3371 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3372 * both be valid, or both be 0 (resulting in delta == 0). This 3373 * is true for each of {clone,origin} independently. 3374 */ 3375 3376 delta = ddpa->cloneusedsnap - 3377 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3378 ASSERT3S(delta, >=, 0); 3379 ASSERT3U(ddpa->used, >=, delta); 3380 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3381 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3382 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3383 3384 delta = ddpa->originusedsnap - 3385 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3386 ASSERT3S(delta, <=, 0); 3387 ASSERT3U(ddpa->used, >=, -delta); 3388 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3389 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3390 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3391 3392 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3393 3394 /* log history record */ 3395 spa_history_log_internal_ds(hds, "promote", tx, ""); 3396 3397 dsl_dir_rele(odd, FTAG); 3398 promote_rele(ddpa, FTAG); 3399 } 3400 3401 /* 3402 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3403 * (exclusive) and last_obj (inclusive). The list will be in reverse 3404 * order (last_obj will be the list_head()). If first_obj == 0, do all 3405 * snapshots back to this dataset's origin. 3406 */ 3407 static int 3408 snaplist_make(dsl_pool_t *dp, 3409 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 3410 { 3411 uint64_t obj = last_obj; 3412 3413 list_create(l, sizeof (struct promotenode), 3414 offsetof(struct promotenode, link)); 3415 3416 while (obj != first_obj) { 3417 dsl_dataset_t *ds; 3418 struct promotenode *snap; 3419 int err; 3420 3421 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3422 ASSERT(err != ENOENT); 3423 if (err != 0) 3424 return (err); 3425 3426 if (first_obj == 0) 3427 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3428 3429 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3430 snap->ds = ds; 3431 list_insert_tail(l, snap); 3432 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3433 } 3434 3435 return (0); 3436 } 3437 3438 static int 3439 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3440 { 3441 struct promotenode *snap; 3442 3443 *spacep = 0; 3444 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3445 uint64_t used, comp, uncomp; 3446 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3447 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3448 *spacep += used; 3449 } 3450 return (0); 3451 } 3452 3453 static void 3454 snaplist_destroy(list_t *l, void *tag) 3455 { 3456 struct promotenode *snap; 3457 3458 if (l == NULL || !list_link_active(&l->list_head)) 3459 return; 3460 3461 while ((snap = list_tail(l)) != NULL) { 3462 list_remove(l, snap); 3463 dsl_dataset_rele(snap->ds, tag); 3464 kmem_free(snap, sizeof (*snap)); 3465 } 3466 list_destroy(l); 3467 } 3468 3469 static int 3470 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 3471 { 3472 int error; 3473 dsl_dir_t *dd; 3474 struct promotenode *snap; 3475 3476 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3477 &ddpa->ddpa_clone); 3478 if (error != 0) 3479 return (error); 3480 dd = ddpa->ddpa_clone->ds_dir; 3481 3482 if (ddpa->ddpa_clone->ds_is_snapshot || 3483 !dsl_dir_is_clone(dd)) { 3484 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3485 return (SET_ERROR(EINVAL)); 3486 } 3487 3488 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3489 &ddpa->shared_snaps, tag); 3490 if (error != 0) 3491 goto out; 3492 3493 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3494 &ddpa->clone_snaps, tag); 3495 if (error != 0) 3496 goto out; 3497 3498 snap = list_head(&ddpa->shared_snaps); 3499 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3500 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3501 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3502 &ddpa->origin_snaps, tag); 3503 if (error != 0) 3504 goto out; 3505 3506 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3507 error = dsl_dataset_hold_obj(dp, 3508 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3509 tag, &ddpa->origin_origin); 3510 if (error != 0) 3511 goto out; 3512 } 3513 out: 3514 if (error != 0) 3515 promote_rele(ddpa, tag); 3516 return (error); 3517 } 3518 3519 static void 3520 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 3521 { 3522 snaplist_destroy(&ddpa->shared_snaps, tag); 3523 snaplist_destroy(&ddpa->clone_snaps, tag); 3524 snaplist_destroy(&ddpa->origin_snaps, tag); 3525 if (ddpa->origin_origin != NULL) 3526 dsl_dataset_rele(ddpa->origin_origin, tag); 3527 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3528 } 3529 3530 /* 3531 * Promote a clone. 3532 * 3533 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3534 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3535 */ 3536 int 3537 dsl_dataset_promote(const char *name, char *conflsnap) 3538 { 3539 dsl_dataset_promote_arg_t ddpa = { 0 }; 3540 uint64_t numsnaps; 3541 int error; 3542 nvpair_t *snap_pair; 3543 objset_t *os; 3544 3545 /* 3546 * We will modify space proportional to the number of 3547 * snapshots. Compute numsnaps. 3548 */ 3549 error = dmu_objset_hold(name, FTAG, &os); 3550 if (error != 0) 3551 return (error); 3552 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3553 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3554 &numsnaps); 3555 dmu_objset_rele(os, FTAG); 3556 if (error != 0) 3557 return (error); 3558 3559 ddpa.ddpa_clonename = name; 3560 ddpa.err_ds = fnvlist_alloc(); 3561 ddpa.cr = CRED(); 3562 3563 error = dsl_sync_task(name, dsl_dataset_promote_check, 3564 dsl_dataset_promote_sync, &ddpa, 3565 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3566 3567 /* 3568 * Return the first conflicting snapshot found. 3569 */ 3570 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3571 if (snap_pair != NULL && conflsnap != NULL) 3572 (void) strcpy(conflsnap, nvpair_name(snap_pair)); 3573 3574 fnvlist_free(ddpa.err_ds); 3575 return (error); 3576 } 3577 3578 int 3579 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3580 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3581 { 3582 /* 3583 * "slack" factor for received datasets with refquota set on them. 3584 * See the bottom of this function for details on its use. 3585 */ 3586 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 3587 int64_t unused_refres_delta; 3588 3589 /* they should both be heads */ 3590 if (clone->ds_is_snapshot || 3591 origin_head->ds_is_snapshot) 3592 return (SET_ERROR(EINVAL)); 3593 3594 /* if we are not forcing, the branch point should be just before them */ 3595 if (!force && clone->ds_prev != origin_head->ds_prev) 3596 return (SET_ERROR(EINVAL)); 3597 3598 /* clone should be the clone (unless they are unrelated) */ 3599 if (clone->ds_prev != NULL && 3600 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3601 origin_head->ds_dir != clone->ds_prev->ds_dir) 3602 return (SET_ERROR(EINVAL)); 3603 3604 /* the clone should be a child of the origin */ 3605 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3606 return (SET_ERROR(EINVAL)); 3607 3608 /* origin_head shouldn't be modified unless 'force' */ 3609 if (!force && 3610 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3611 return (SET_ERROR(ETXTBSY)); 3612 3613 /* origin_head should have no long holds (e.g. is not mounted) */ 3614 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3615 return (SET_ERROR(EBUSY)); 3616 3617 /* check amount of any unconsumed refreservation */ 3618 unused_refres_delta = 3619 (int64_t)MIN(origin_head->ds_reserved, 3620 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3621 (int64_t)MIN(origin_head->ds_reserved, 3622 dsl_dataset_phys(clone)->ds_unique_bytes); 3623 3624 if (unused_refres_delta > 0 && 3625 unused_refres_delta > 3626 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3627 return (SET_ERROR(ENOSPC)); 3628 3629 /* 3630 * The clone can't be too much over the head's refquota. 3631 * 3632 * To ensure that the entire refquota can be used, we allow one 3633 * transaction to exceed the the refquota. Therefore, this check 3634 * needs to also allow for the space referenced to be more than the 3635 * refquota. The maximum amount of space that one transaction can use 3636 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3637 * overage ensures that we are able to receive a filesystem that 3638 * exceeds the refquota on the source system. 3639 * 3640 * So that overage is the refquota_slack we use below. 3641 */ 3642 if (origin_head->ds_quota != 0 && 3643 dsl_dataset_phys(clone)->ds_referenced_bytes > 3644 origin_head->ds_quota + refquota_slack) 3645 return (SET_ERROR(EDQUOT)); 3646 3647 return (0); 3648 } 3649 3650 static void 3651 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3652 dsl_dataset_t *origin, dmu_tx_t *tx) 3653 { 3654 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 3655 dsl_pool_t *dp = dmu_tx_pool(tx); 3656 3657 ASSERT(dsl_pool_sync_context(dp)); 3658 3659 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 3660 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 3661 3662 if (clone_remap_dl_obj != 0) { 3663 dsl_deadlist_close(&clone->ds_remap_deadlist); 3664 dsl_dataset_unset_remap_deadlist_object(clone, tx); 3665 } 3666 if (origin_remap_dl_obj != 0) { 3667 dsl_deadlist_close(&origin->ds_remap_deadlist); 3668 dsl_dataset_unset_remap_deadlist_object(origin, tx); 3669 } 3670 3671 if (clone_remap_dl_obj != 0) { 3672 dsl_dataset_set_remap_deadlist_object(origin, 3673 clone_remap_dl_obj, tx); 3674 dsl_deadlist_open(&origin->ds_remap_deadlist, 3675 dp->dp_meta_objset, clone_remap_dl_obj); 3676 } 3677 if (origin_remap_dl_obj != 0) { 3678 dsl_dataset_set_remap_deadlist_object(clone, 3679 origin_remap_dl_obj, tx); 3680 dsl_deadlist_open(&clone->ds_remap_deadlist, 3681 dp->dp_meta_objset, origin_remap_dl_obj); 3682 } 3683 } 3684 3685 void 3686 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 3687 dsl_dataset_t *origin_head, dmu_tx_t *tx) 3688 { 3689 dsl_pool_t *dp = dmu_tx_pool(tx); 3690 int64_t unused_refres_delta; 3691 3692 ASSERT(clone->ds_reserved == 0); 3693 /* 3694 * NOTE: On DEBUG kernels there could be a race between this and 3695 * the check function if spa_asize_inflation is adjusted... 3696 */ 3697 ASSERT(origin_head->ds_quota == 0 || 3698 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 3699 DMU_MAX_ACCESS * spa_asize_inflation); 3700 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 3701 3702 /* 3703 * Swap per-dataset feature flags. 3704 */ 3705 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 3706 if (!(spa_feature_table[f].fi_flags & 3707 ZFEATURE_FLAG_PER_DATASET)) { 3708 ASSERT(!dsl_dataset_feature_is_active(clone, f)); 3709 ASSERT(!dsl_dataset_feature_is_active(origin_head, f)); 3710 continue; 3711 } 3712 3713 boolean_t clone_inuse = dsl_dataset_feature_is_active(clone, f); 3714 void *clone_feature = clone->ds_feature[f]; 3715 boolean_t origin_head_inuse = 3716 dsl_dataset_feature_is_active(origin_head, f); 3717 void *origin_head_feature = origin_head->ds_feature[f]; 3718 3719 if (clone_inuse) 3720 dsl_dataset_deactivate_feature_impl(clone, f, tx); 3721 if (origin_head_inuse) 3722 dsl_dataset_deactivate_feature_impl(origin_head, f, tx); 3723 3724 if (clone_inuse) { 3725 dsl_dataset_activate_feature(origin_head->ds_object, f, 3726 clone_feature, tx); 3727 origin_head->ds_feature[f] = clone_feature; 3728 } 3729 if (origin_head_inuse) { 3730 dsl_dataset_activate_feature(clone->ds_object, f, 3731 origin_head_feature, tx); 3732 clone->ds_feature[f] = origin_head_feature; 3733 } 3734 } 3735 3736 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3737 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3738 3739 if (clone->ds_objset != NULL) { 3740 dmu_objset_evict(clone->ds_objset); 3741 clone->ds_objset = NULL; 3742 } 3743 3744 if (origin_head->ds_objset != NULL) { 3745 dmu_objset_evict(origin_head->ds_objset); 3746 origin_head->ds_objset = NULL; 3747 } 3748 3749 unused_refres_delta = 3750 (int64_t)MIN(origin_head->ds_reserved, 3751 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3752 (int64_t)MIN(origin_head->ds_reserved, 3753 dsl_dataset_phys(clone)->ds_unique_bytes); 3754 3755 /* 3756 * Reset origin's unique bytes, if it exists. 3757 */ 3758 if (clone->ds_prev) { 3759 dsl_dataset_t *origin = clone->ds_prev; 3760 uint64_t comp, uncomp; 3761 3762 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3763 dsl_deadlist_space_range(&clone->ds_deadlist, 3764 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3765 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3766 } 3767 3768 /* swap blkptrs */ 3769 { 3770 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 3771 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 3772 blkptr_t tmp; 3773 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3774 dsl_dataset_phys(origin_head)->ds_bp = 3775 dsl_dataset_phys(clone)->ds_bp; 3776 dsl_dataset_phys(clone)->ds_bp = tmp; 3777 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 3778 rrw_exit(&clone->ds_bp_rwlock, FTAG); 3779 } 3780 3781 /* set dd_*_bytes */ 3782 { 3783 int64_t dused, dcomp, duncomp; 3784 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3785 uint64_t odl_used, odl_comp, odl_uncomp; 3786 3787 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3788 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3789 3790 dsl_deadlist_space(&clone->ds_deadlist, 3791 &cdl_used, &cdl_comp, &cdl_uncomp); 3792 dsl_deadlist_space(&origin_head->ds_deadlist, 3793 &odl_used, &odl_comp, &odl_uncomp); 3794 3795 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3796 cdl_used - 3797 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3798 odl_used); 3799 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3800 cdl_comp - 3801 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3802 odl_comp); 3803 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3804 cdl_uncomp - 3805 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3806 odl_uncomp); 3807 3808 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3809 dused, dcomp, duncomp, tx); 3810 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3811 -dused, -dcomp, -duncomp, tx); 3812 3813 /* 3814 * The difference in the space used by snapshots is the 3815 * difference in snapshot space due to the head's 3816 * deadlist (since that's the only thing that's 3817 * changing that affects the snapused). 3818 */ 3819 dsl_deadlist_space_range(&clone->ds_deadlist, 3820 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3821 &cdl_used, &cdl_comp, &cdl_uncomp); 3822 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3823 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3824 &odl_used, &odl_comp, &odl_uncomp); 3825 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3826 DD_USED_HEAD, DD_USED_SNAP, tx); 3827 } 3828 3829 /* swap ds_*_bytes */ 3830 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3831 dsl_dataset_phys(clone)->ds_referenced_bytes); 3832 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3833 dsl_dataset_phys(clone)->ds_compressed_bytes); 3834 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3835 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3836 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3837 dsl_dataset_phys(clone)->ds_unique_bytes); 3838 3839 /* apply any parent delta for change in unconsumed refreservation */ 3840 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3841 unused_refres_delta, 0, 0, tx); 3842 3843 /* 3844 * Swap deadlists. 3845 */ 3846 dsl_deadlist_close(&clone->ds_deadlist); 3847 dsl_deadlist_close(&origin_head->ds_deadlist); 3848 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3849 dsl_dataset_phys(clone)->ds_deadlist_obj); 3850 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3851 dsl_dataset_phys(clone)->ds_deadlist_obj); 3852 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3853 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3854 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 3855 3856 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3857 3858 spa_history_log_internal_ds(clone, "clone swap", tx, 3859 "parent=%s", origin_head->ds_dir->dd_myname); 3860 } 3861 3862 /* 3863 * Given a pool name and a dataset object number in that pool, 3864 * return the name of that dataset. 3865 */ 3866 int 3867 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3868 { 3869 dsl_pool_t *dp; 3870 dsl_dataset_t *ds; 3871 int error; 3872 3873 error = dsl_pool_hold(pname, FTAG, &dp); 3874 if (error != 0) 3875 return (error); 3876 3877 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3878 if (error == 0) { 3879 dsl_dataset_name(ds, buf); 3880 dsl_dataset_rele(ds, FTAG); 3881 } 3882 dsl_pool_rele(dp, FTAG); 3883 3884 return (error); 3885 } 3886 3887 int 3888 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3889 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3890 { 3891 int error = 0; 3892 3893 ASSERT3S(asize, >, 0); 3894 3895 /* 3896 * *ref_rsrv is the portion of asize that will come from any 3897 * unconsumed refreservation space. 3898 */ 3899 *ref_rsrv = 0; 3900 3901 mutex_enter(&ds->ds_lock); 3902 /* 3903 * Make a space adjustment for reserved bytes. 3904 */ 3905 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3906 ASSERT3U(*used, >=, 3907 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3908 *used -= 3909 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3910 *ref_rsrv = 3911 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3912 } 3913 3914 if (!check_quota || ds->ds_quota == 0) { 3915 mutex_exit(&ds->ds_lock); 3916 return (0); 3917 } 3918 /* 3919 * If they are requesting more space, and our current estimate 3920 * is over quota, they get to try again unless the actual 3921 * on-disk is over quota and there are no pending changes (which 3922 * may free up space for us). 3923 */ 3924 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3925 ds->ds_quota) { 3926 if (inflight > 0 || 3927 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3928 error = SET_ERROR(ERESTART); 3929 else 3930 error = SET_ERROR(EDQUOT); 3931 } 3932 mutex_exit(&ds->ds_lock); 3933 3934 return (error); 3935 } 3936 3937 typedef struct dsl_dataset_set_qr_arg { 3938 const char *ddsqra_name; 3939 zprop_source_t ddsqra_source; 3940 uint64_t ddsqra_value; 3941 } dsl_dataset_set_qr_arg_t; 3942 3943 3944 /* ARGSUSED */ 3945 static int 3946 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3947 { 3948 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3949 dsl_pool_t *dp = dmu_tx_pool(tx); 3950 dsl_dataset_t *ds; 3951 int error; 3952 uint64_t newval; 3953 3954 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3955 return (SET_ERROR(ENOTSUP)); 3956 3957 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3958 if (error != 0) 3959 return (error); 3960 3961 if (ds->ds_is_snapshot) { 3962 dsl_dataset_rele(ds, FTAG); 3963 return (SET_ERROR(EINVAL)); 3964 } 3965 3966 error = dsl_prop_predict(ds->ds_dir, 3967 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3968 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3969 if (error != 0) { 3970 dsl_dataset_rele(ds, FTAG); 3971 return (error); 3972 } 3973 3974 if (newval == 0) { 3975 dsl_dataset_rele(ds, FTAG); 3976 return (0); 3977 } 3978 3979 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3980 newval < ds->ds_reserved) { 3981 dsl_dataset_rele(ds, FTAG); 3982 return (SET_ERROR(ENOSPC)); 3983 } 3984 3985 dsl_dataset_rele(ds, FTAG); 3986 return (0); 3987 } 3988 3989 static void 3990 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3991 { 3992 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3993 dsl_pool_t *dp = dmu_tx_pool(tx); 3994 dsl_dataset_t *ds; 3995 uint64_t newval; 3996 3997 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3998 3999 dsl_prop_set_sync_impl(ds, 4000 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 4001 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 4002 &ddsqra->ddsqra_value, tx); 4003 4004 VERIFY0(dsl_prop_get_int_ds(ds, 4005 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 4006 4007 if (ds->ds_quota != newval) { 4008 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4009 ds->ds_quota = newval; 4010 } 4011 dsl_dataset_rele(ds, FTAG); 4012 } 4013 4014 int 4015 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 4016 uint64_t refquota) 4017 { 4018 dsl_dataset_set_qr_arg_t ddsqra; 4019 4020 ddsqra.ddsqra_name = dsname; 4021 ddsqra.ddsqra_source = source; 4022 ddsqra.ddsqra_value = refquota; 4023 4024 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 4025 dsl_dataset_set_refquota_sync, &ddsqra, 0, 4026 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4027 } 4028 4029 static int 4030 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 4031 { 4032 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4033 dsl_pool_t *dp = dmu_tx_pool(tx); 4034 dsl_dataset_t *ds; 4035 int error; 4036 uint64_t newval, unique; 4037 4038 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 4039 return (SET_ERROR(ENOTSUP)); 4040 4041 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 4042 if (error != 0) 4043 return (error); 4044 4045 if (ds->ds_is_snapshot) { 4046 dsl_dataset_rele(ds, FTAG); 4047 return (SET_ERROR(EINVAL)); 4048 } 4049 4050 error = dsl_prop_predict(ds->ds_dir, 4051 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4052 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 4053 if (error != 0) { 4054 dsl_dataset_rele(ds, FTAG); 4055 return (error); 4056 } 4057 4058 /* 4059 * If we are doing the preliminary check in open context, the 4060 * space estimates may be inaccurate. 4061 */ 4062 if (!dmu_tx_is_syncing(tx)) { 4063 dsl_dataset_rele(ds, FTAG); 4064 return (0); 4065 } 4066 4067 mutex_enter(&ds->ds_lock); 4068 if (!DS_UNIQUE_IS_ACCURATE(ds)) 4069 dsl_dataset_recalc_head_uniq(ds); 4070 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4071 mutex_exit(&ds->ds_lock); 4072 4073 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 4074 uint64_t delta = MAX(unique, newval) - 4075 MAX(unique, ds->ds_reserved); 4076 4077 if (delta > 4078 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 4079 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 4080 dsl_dataset_rele(ds, FTAG); 4081 return (SET_ERROR(ENOSPC)); 4082 } 4083 } 4084 4085 dsl_dataset_rele(ds, FTAG); 4086 return (0); 4087 } 4088 4089 void 4090 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 4091 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 4092 { 4093 uint64_t newval; 4094 uint64_t unique; 4095 int64_t delta; 4096 4097 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 4098 source, sizeof (value), 1, &value, tx); 4099 4100 VERIFY0(dsl_prop_get_int_ds(ds, 4101 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 4102 4103 dmu_buf_will_dirty(ds->ds_dbuf, tx); 4104 mutex_enter(&ds->ds_dir->dd_lock); 4105 mutex_enter(&ds->ds_lock); 4106 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 4107 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 4108 delta = MAX(0, (int64_t)(newval - unique)) - 4109 MAX(0, (int64_t)(ds->ds_reserved - unique)); 4110 ds->ds_reserved = newval; 4111 mutex_exit(&ds->ds_lock); 4112 4113 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 4114 mutex_exit(&ds->ds_dir->dd_lock); 4115 } 4116 4117 static void 4118 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 4119 { 4120 dsl_dataset_set_qr_arg_t *ddsqra = arg; 4121 dsl_pool_t *dp = dmu_tx_pool(tx); 4122 dsl_dataset_t *ds; 4123 4124 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 4125 dsl_dataset_set_refreservation_sync_impl(ds, 4126 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 4127 dsl_dataset_rele(ds, FTAG); 4128 } 4129 4130 int 4131 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 4132 uint64_t refreservation) 4133 { 4134 dsl_dataset_set_qr_arg_t ddsqra; 4135 4136 ddsqra.ddsqra_name = dsname; 4137 ddsqra.ddsqra_source = source; 4138 ddsqra.ddsqra_value = refreservation; 4139 4140 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 4141 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 4142 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 4143 } 4144 4145 /* 4146 * Return (in *usedp) the amount of space written in new that is not 4147 * present in oldsnap. New may be a snapshot or the head. Old must be 4148 * a snapshot before new, in new's filesystem (or its origin). If not then 4149 * fail and return EINVAL. 4150 * 4151 * The written space is calculated by considering two components: First, we 4152 * ignore any freed space, and calculate the written as new's used space 4153 * minus old's used space. Next, we add in the amount of space that was freed 4154 * between the two snapshots, thus reducing new's used space relative to old's. 4155 * Specifically, this is the space that was born before old->ds_creation_txg, 4156 * and freed before new (ie. on new's deadlist or a previous deadlist). 4157 * 4158 * space freed [---------------------] 4159 * snapshots ---O-------O--------O-------O------ 4160 * oldsnap new 4161 */ 4162 int 4163 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4164 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4165 { 4166 int err = 0; 4167 uint64_t snapobj; 4168 dsl_pool_t *dp = new->ds_dir->dd_pool; 4169 4170 ASSERT(dsl_pool_config_held(dp)); 4171 4172 *usedp = 0; 4173 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4174 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 4175 4176 *compp = 0; 4177 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4178 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 4179 4180 *uncompp = 0; 4181 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4182 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 4183 4184 snapobj = new->ds_object; 4185 while (snapobj != oldsnap->ds_object) { 4186 dsl_dataset_t *snap; 4187 uint64_t used, comp, uncomp; 4188 4189 if (snapobj == new->ds_object) { 4190 snap = new; 4191 } else { 4192 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4193 if (err != 0) 4194 break; 4195 } 4196 4197 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 4198 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 4199 /* 4200 * The blocks in the deadlist can not be born after 4201 * ds_prev_snap_txg, so get the whole deadlist space, 4202 * which is more efficient (especially for old-format 4203 * deadlists). Unfortunately the deadlist code 4204 * doesn't have enough information to make this 4205 * optimization itself. 4206 */ 4207 dsl_deadlist_space(&snap->ds_deadlist, 4208 &used, &comp, &uncomp); 4209 } else { 4210 dsl_deadlist_space_range(&snap->ds_deadlist, 4211 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 4212 &used, &comp, &uncomp); 4213 } 4214 *usedp += used; 4215 *compp += comp; 4216 *uncompp += uncomp; 4217 4218 /* 4219 * If we get to the beginning of the chain of snapshots 4220 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 4221 * was not a snapshot of/before new. 4222 */ 4223 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4224 if (snap != new) 4225 dsl_dataset_rele(snap, FTAG); 4226 if (snapobj == 0) { 4227 err = SET_ERROR(EINVAL); 4228 break; 4229 } 4230 4231 } 4232 return (err); 4233 } 4234 4235 /* 4236 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4237 * lastsnap, and all snapshots in between are deleted. 4238 * 4239 * blocks that would be freed [---------------------------] 4240 * snapshots ---O-------O--------O-------O--------O 4241 * firstsnap lastsnap 4242 * 4243 * This is the set of blocks that were born after the snap before firstsnap, 4244 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4245 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4246 * We calculate this by iterating over the relevant deadlists (from the snap 4247 * after lastsnap, backward to the snap after firstsnap), summing up the 4248 * space on the deadlist that was born after the snap before firstsnap. 4249 */ 4250 int 4251 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4252 dsl_dataset_t *lastsnap, 4253 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4254 { 4255 int err = 0; 4256 uint64_t snapobj; 4257 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4258 4259 ASSERT(firstsnap->ds_is_snapshot); 4260 ASSERT(lastsnap->ds_is_snapshot); 4261 4262 /* 4263 * Check that the snapshots are in the same dsl_dir, and firstsnap 4264 * is before lastsnap. 4265 */ 4266 if (firstsnap->ds_dir != lastsnap->ds_dir || 4267 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4268 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4269 return (SET_ERROR(EINVAL)); 4270 4271 *usedp = *compp = *uncompp = 0; 4272 4273 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4274 while (snapobj != firstsnap->ds_object) { 4275 dsl_dataset_t *ds; 4276 uint64_t used, comp, uncomp; 4277 4278 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4279 if (err != 0) 4280 break; 4281 4282 dsl_deadlist_space_range(&ds->ds_deadlist, 4283 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4284 &used, &comp, &uncomp); 4285 *usedp += used; 4286 *compp += comp; 4287 *uncompp += uncomp; 4288 4289 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4290 ASSERT3U(snapobj, !=, 0); 4291 dsl_dataset_rele(ds, FTAG); 4292 } 4293 return (err); 4294 } 4295 4296 /* 4297 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4298 * For example, they could both be snapshots of the same filesystem, and 4299 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4300 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4301 * filesystem. Or 'earlier' could be the origin's origin. 4302 * 4303 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4304 */ 4305 boolean_t 4306 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4307 uint64_t earlier_txg) 4308 { 4309 dsl_pool_t *dp = later->ds_dir->dd_pool; 4310 int error; 4311 boolean_t ret; 4312 4313 ASSERT(dsl_pool_config_held(dp)); 4314 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4315 4316 if (earlier_txg == 0) 4317 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4318 4319 if (later->ds_is_snapshot && 4320 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4321 return (B_FALSE); 4322 4323 if (later->ds_dir == earlier->ds_dir) 4324 return (B_TRUE); 4325 if (!dsl_dir_is_clone(later->ds_dir)) 4326 return (B_FALSE); 4327 4328 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 4329 return (B_TRUE); 4330 dsl_dataset_t *origin; 4331 error = dsl_dataset_hold_obj(dp, 4332 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4333 if (error != 0) 4334 return (B_FALSE); 4335 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4336 dsl_dataset_rele(origin, FTAG); 4337 return (ret); 4338 } 4339 4340 void 4341 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4342 { 4343 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4344 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4345 } 4346 4347 boolean_t 4348 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4349 { 4350 dmu_object_info_t doi; 4351 4352 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4353 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4354 } 4355 4356 boolean_t 4357 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4358 { 4359 return (dsl_dataset_is_zapified(ds) && 4360 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4361 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4362 } 4363 4364 uint64_t 4365 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4366 { 4367 uint64_t remap_deadlist_obj; 4368 int err; 4369 4370 if (!dsl_dataset_is_zapified(ds)) 4371 return (0); 4372 4373 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4374 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4375 &remap_deadlist_obj); 4376 4377 if (err != 0) { 4378 VERIFY3S(err, ==, ENOENT); 4379 return (0); 4380 } 4381 4382 ASSERT(remap_deadlist_obj != 0); 4383 return (remap_deadlist_obj); 4384 } 4385 4386 boolean_t 4387 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4388 { 4389 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4390 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4391 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4392 } 4393 4394 static void 4395 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4396 dmu_tx_t *tx) 4397 { 4398 ASSERT(obj != 0); 4399 dsl_dataset_zapify(ds, tx); 4400 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4401 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4402 } 4403 4404 static void 4405 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4406 { 4407 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4408 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4409 } 4410 4411 void 4412 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4413 { 4414 uint64_t remap_deadlist_object; 4415 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4416 4417 ASSERT(dmu_tx_is_syncing(tx)); 4418 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4419 4420 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4421 dsl_deadlist_close(&ds->ds_remap_deadlist); 4422 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4423 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4424 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4425 } 4426 4427 void 4428 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4429 { 4430 uint64_t remap_deadlist_obj; 4431 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4432 4433 ASSERT(dmu_tx_is_syncing(tx)); 4434 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4435 /* 4436 * Currently we only create remap deadlists when there are indirect 4437 * vdevs with referenced mappings. 4438 */ 4439 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4440 4441 remap_deadlist_obj = dsl_deadlist_clone( 4442 &ds->ds_deadlist, UINT64_MAX, 4443 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4444 dsl_dataset_set_remap_deadlist_object(ds, 4445 remap_deadlist_obj, tx); 4446 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4447 remap_deadlist_obj); 4448 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4449 } 4450