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, 2017 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 extern int spa_asize_inflation; 92 93 static zil_header_t zero_zil; 94 95 /* 96 * Figure out how much of this delta should be propogated to the dsl_dir 97 * layer. If there's a refreservation, that space has already been 98 * partially accounted for in our ancestors. 99 */ 100 static int64_t 101 parent_delta(dsl_dataset_t *ds, int64_t delta) 102 { 103 dsl_dataset_phys_t *ds_phys; 104 uint64_t old_bytes, new_bytes; 105 106 if (ds->ds_reserved == 0) 107 return (delta); 108 109 ds_phys = dsl_dataset_phys(ds); 110 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 111 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 112 113 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 114 return (new_bytes - old_bytes); 115 } 116 117 void 118 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 119 { 120 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 121 int compressed = BP_GET_PSIZE(bp); 122 int uncompressed = BP_GET_UCSIZE(bp); 123 int64_t delta; 124 125 dprintf_bp(bp, "ds=%p", ds); 126 127 ASSERT(dmu_tx_is_syncing(tx)); 128 /* It could have been compressed away to nothing */ 129 if (BP_IS_HOLE(bp)) 130 return; 131 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 132 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 133 if (ds == NULL) { 134 dsl_pool_mos_diduse_space(tx->tx_pool, 135 used, compressed, uncompressed); 136 return; 137 } 138 139 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 140 dmu_buf_will_dirty(ds->ds_dbuf, tx); 141 mutex_enter(&ds->ds_lock); 142 delta = parent_delta(ds, used); 143 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 144 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 145 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 146 dsl_dataset_phys(ds)->ds_unique_bytes += used; 147 148 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 149 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 150 B_TRUE; 151 } 152 153 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 154 if (f != SPA_FEATURE_NONE) 155 ds->ds_feature_activation_needed[f] = B_TRUE; 156 157 mutex_exit(&ds->ds_lock); 158 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 159 compressed, uncompressed, tx); 160 dsl_dir_transfer_space(ds->ds_dir, used - delta, 161 DD_USED_REFRSRV, DD_USED_HEAD, tx); 162 } 163 164 /* 165 * Called when the specified segment has been remapped, and is thus no 166 * longer referenced in the head dataset. The vdev must be indirect. 167 * 168 * If the segment is referenced by a snapshot, put it on the remap deadlist. 169 * Otherwise, add this segment to the obsolete spacemap. 170 */ 171 void 172 dsl_dataset_block_remapped(dsl_dataset_t *ds, uint64_t vdev, uint64_t offset, 173 uint64_t size, uint64_t birth, dmu_tx_t *tx) 174 { 175 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 176 177 ASSERT(dmu_tx_is_syncing(tx)); 178 ASSERT(birth <= tx->tx_txg); 179 ASSERT(!ds->ds_is_snapshot); 180 181 if (birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 182 spa_vdev_indirect_mark_obsolete(spa, vdev, offset, size, tx); 183 } else { 184 blkptr_t fakebp; 185 dva_t *dva = &fakebp.blk_dva[0]; 186 187 ASSERT(ds != NULL); 188 189 mutex_enter(&ds->ds_remap_deadlist_lock); 190 if (!dsl_dataset_remap_deadlist_exists(ds)) { 191 dsl_dataset_create_remap_deadlist(ds, tx); 192 } 193 mutex_exit(&ds->ds_remap_deadlist_lock); 194 195 BP_ZERO(&fakebp); 196 fakebp.blk_birth = birth; 197 DVA_SET_VDEV(dva, vdev); 198 DVA_SET_OFFSET(dva, offset); 199 DVA_SET_ASIZE(dva, size); 200 201 dsl_deadlist_insert(&ds->ds_remap_deadlist, &fakebp, tx); 202 } 203 } 204 205 int 206 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 207 boolean_t async) 208 { 209 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 210 211 int used = bp_get_dsize_sync(spa, bp); 212 int compressed = BP_GET_PSIZE(bp); 213 int uncompressed = BP_GET_UCSIZE(bp); 214 215 if (BP_IS_HOLE(bp)) 216 return (0); 217 218 ASSERT(dmu_tx_is_syncing(tx)); 219 ASSERT(bp->blk_birth <= tx->tx_txg); 220 221 if (ds == NULL) { 222 dsl_free(tx->tx_pool, tx->tx_txg, bp); 223 dsl_pool_mos_diduse_space(tx->tx_pool, 224 -used, -compressed, -uncompressed); 225 return (used); 226 } 227 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 228 229 ASSERT(!ds->ds_is_snapshot); 230 dmu_buf_will_dirty(ds->ds_dbuf, tx); 231 232 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 233 int64_t delta; 234 235 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 236 dsl_free(tx->tx_pool, tx->tx_txg, bp); 237 238 mutex_enter(&ds->ds_lock); 239 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 240 !DS_UNIQUE_IS_ACCURATE(ds)); 241 delta = parent_delta(ds, -used); 242 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 243 mutex_exit(&ds->ds_lock); 244 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 245 delta, -compressed, -uncompressed, tx); 246 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 247 DD_USED_REFRSRV, DD_USED_HEAD, tx); 248 } else { 249 dprintf_bp(bp, "putting on dead list: %s", ""); 250 if (async) { 251 /* 252 * We are here as part of zio's write done callback, 253 * which means we're a zio interrupt thread. We can't 254 * call dsl_deadlist_insert() now because it may block 255 * waiting for I/O. Instead, put bp on the deferred 256 * queue and let dsl_pool_sync() finish the job. 257 */ 258 bplist_append(&ds->ds_pending_deadlist, bp); 259 } else { 260 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 261 } 262 ASSERT3U(ds->ds_prev->ds_object, ==, 263 dsl_dataset_phys(ds)->ds_prev_snap_obj); 264 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 265 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 266 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 267 ds->ds_object && bp->blk_birth > 268 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 269 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 270 mutex_enter(&ds->ds_prev->ds_lock); 271 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 272 mutex_exit(&ds->ds_prev->ds_lock); 273 } 274 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 275 dsl_dir_transfer_space(ds->ds_dir, used, 276 DD_USED_HEAD, DD_USED_SNAP, tx); 277 } 278 } 279 mutex_enter(&ds->ds_lock); 280 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 281 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 282 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 283 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 284 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 285 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 286 mutex_exit(&ds->ds_lock); 287 288 return (used); 289 } 290 291 /* 292 * We have to release the fsid syncronously or we risk that a subsequent 293 * mount of the same dataset will fail to unique_insert the fsid. This 294 * failure would manifest itself as the fsid of this dataset changing 295 * between mounts which makes NFS clients quite unhappy. 296 */ 297 static void 298 dsl_dataset_evict_sync(void *dbu) 299 { 300 dsl_dataset_t *ds = dbu; 301 302 ASSERT(ds->ds_owner == NULL); 303 304 unique_remove(ds->ds_fsid_guid); 305 } 306 307 static void 308 dsl_dataset_evict_async(void *dbu) 309 { 310 dsl_dataset_t *ds = dbu; 311 312 ASSERT(ds->ds_owner == NULL); 313 314 ds->ds_dbuf = NULL; 315 316 if (ds->ds_objset != NULL) 317 dmu_objset_evict(ds->ds_objset); 318 319 if (ds->ds_prev) { 320 dsl_dataset_rele(ds->ds_prev, ds); 321 ds->ds_prev = NULL; 322 } 323 324 bplist_destroy(&ds->ds_pending_deadlist); 325 if (dsl_deadlist_is_open(&ds->ds_deadlist)) 326 dsl_deadlist_close(&ds->ds_deadlist); 327 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 328 dsl_deadlist_close(&ds->ds_remap_deadlist); 329 if (ds->ds_dir) 330 dsl_dir_async_rele(ds->ds_dir, ds); 331 332 ASSERT(!list_link_active(&ds->ds_synced_link)); 333 334 list_destroy(&ds->ds_prop_cbs); 335 mutex_destroy(&ds->ds_lock); 336 mutex_destroy(&ds->ds_opening_lock); 337 mutex_destroy(&ds->ds_sendstream_lock); 338 mutex_destroy(&ds->ds_remap_deadlist_lock); 339 zfs_refcount_destroy(&ds->ds_longholds); 340 rrw_destroy(&ds->ds_bp_rwlock); 341 342 kmem_free(ds, sizeof (dsl_dataset_t)); 343 } 344 345 int 346 dsl_dataset_get_snapname(dsl_dataset_t *ds) 347 { 348 dsl_dataset_phys_t *headphys; 349 int err; 350 dmu_buf_t *headdbuf; 351 dsl_pool_t *dp = ds->ds_dir->dd_pool; 352 objset_t *mos = dp->dp_meta_objset; 353 354 if (ds->ds_snapname[0]) 355 return (0); 356 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 357 return (0); 358 359 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 360 FTAG, &headdbuf); 361 if (err != 0) 362 return (err); 363 headphys = headdbuf->db_data; 364 err = zap_value_search(dp->dp_meta_objset, 365 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 366 dmu_buf_rele(headdbuf, FTAG); 367 return (err); 368 } 369 370 int 371 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 372 { 373 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 374 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 375 matchtype_t mt = 0; 376 int err; 377 378 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 379 mt = MT_NORMALIZE; 380 381 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 382 value, mt, NULL, 0, NULL); 383 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 384 err = zap_lookup(mos, snapobj, name, 8, 1, value); 385 return (err); 386 } 387 388 int 389 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 390 boolean_t adj_cnt) 391 { 392 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 393 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 394 matchtype_t mt = 0; 395 int err; 396 397 dsl_dir_snap_cmtime_update(ds->ds_dir); 398 399 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 400 mt = MT_NORMALIZE; 401 402 err = zap_remove_norm(mos, snapobj, name, mt, tx); 403 if (err == ENOTSUP && (mt & MT_NORMALIZE)) 404 err = zap_remove(mos, snapobj, name, tx); 405 406 if (err == 0 && adj_cnt) 407 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 408 DD_FIELD_SNAPSHOT_COUNT, tx); 409 410 return (err); 411 } 412 413 boolean_t 414 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 415 { 416 dmu_buf_t *dbuf = ds->ds_dbuf; 417 boolean_t result = B_FALSE; 418 419 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 420 ds->ds_object, DMU_BONUS_BLKID, tag)) { 421 422 if (ds == dmu_buf_get_user(dbuf)) 423 result = B_TRUE; 424 else 425 dmu_buf_rele(dbuf, tag); 426 } 427 428 return (result); 429 } 430 431 int 432 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 433 dsl_dataset_t **dsp) 434 { 435 objset_t *mos = dp->dp_meta_objset; 436 dmu_buf_t *dbuf; 437 dsl_dataset_t *ds; 438 int err; 439 dmu_object_info_t doi; 440 441 ASSERT(dsl_pool_config_held(dp)); 442 443 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 444 if (err != 0) 445 return (err); 446 447 /* Make sure dsobj has the correct object type. */ 448 dmu_object_info_from_db(dbuf, &doi); 449 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 450 dmu_buf_rele(dbuf, tag); 451 return (SET_ERROR(EINVAL)); 452 } 453 454 ds = dmu_buf_get_user(dbuf); 455 if (ds == NULL) { 456 dsl_dataset_t *winner = NULL; 457 458 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 459 ds->ds_dbuf = dbuf; 460 ds->ds_object = dsobj; 461 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 462 463 err = dsl_dir_hold_obj(dp, dsl_dataset_phys(ds)->ds_dir_obj, 464 NULL, ds, &ds->ds_dir); 465 if (err != 0) { 466 kmem_free(ds, sizeof (dsl_dataset_t)); 467 dmu_buf_rele(dbuf, tag); 468 return (err); 469 } 470 471 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 472 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 473 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 474 mutex_init(&ds->ds_remap_deadlist_lock, 475 NULL, MUTEX_DEFAULT, NULL); 476 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 477 zfs_refcount_create(&ds->ds_longholds); 478 479 bplist_create(&ds->ds_pending_deadlist); 480 481 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 482 offsetof(dmu_sendarg_t, dsa_link)); 483 484 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 485 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 486 487 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 488 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 489 if (!(spa_feature_table[f].fi_flags & 490 ZFEATURE_FLAG_PER_DATASET)) 491 continue; 492 err = zap_contains(mos, dsobj, 493 spa_feature_table[f].fi_guid); 494 if (err == 0) { 495 ds->ds_feature_inuse[f] = B_TRUE; 496 } else { 497 ASSERT3U(err, ==, ENOENT); 498 err = 0; 499 } 500 } 501 } 502 503 if (!ds->ds_is_snapshot) { 504 ds->ds_snapname[0] = '\0'; 505 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 506 err = dsl_dataset_hold_obj(dp, 507 dsl_dataset_phys(ds)->ds_prev_snap_obj, 508 ds, &ds->ds_prev); 509 } 510 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 511 int zaperr = zap_lookup(mos, ds->ds_object, 512 DS_FIELD_BOOKMARK_NAMES, 513 sizeof (ds->ds_bookmarks), 1, 514 &ds->ds_bookmarks); 515 if (zaperr != ENOENT) 516 VERIFY0(zaperr); 517 } 518 } else { 519 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 520 err = dsl_dataset_get_snapname(ds); 521 if (err == 0 && 522 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 523 err = zap_count( 524 ds->ds_dir->dd_pool->dp_meta_objset, 525 dsl_dataset_phys(ds)->ds_userrefs_obj, 526 &ds->ds_userrefs); 527 } 528 } 529 530 if (err == 0 && !ds->ds_is_snapshot) { 531 err = dsl_prop_get_int_ds(ds, 532 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 533 &ds->ds_reserved); 534 if (err == 0) { 535 err = dsl_prop_get_int_ds(ds, 536 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 537 &ds->ds_quota); 538 } 539 } else { 540 ds->ds_reserved = ds->ds_quota = 0; 541 } 542 543 if (err == 0 && ds->ds_dir->dd_crypto_obj != 0 && 544 ds->ds_is_snapshot && 545 zap_contains(mos, dsobj, DS_FIELD_IVSET_GUID) != 0) { 546 dp->dp_spa->spa_errata = 547 ZPOOL_ERRATA_ZOL_8308_ENCRYPTION; 548 } 549 550 dsl_deadlist_open(&ds->ds_deadlist, 551 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 552 uint64_t remap_deadlist_obj = 553 dsl_dataset_get_remap_deadlist_object(ds); 554 if (remap_deadlist_obj != 0) { 555 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 556 remap_deadlist_obj); 557 } 558 559 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 560 dsl_dataset_evict_async, &ds->ds_dbuf); 561 if (err == 0) 562 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 563 564 if (err != 0 || winner != NULL) { 565 bplist_destroy(&ds->ds_pending_deadlist); 566 dsl_deadlist_close(&ds->ds_deadlist); 567 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 568 dsl_deadlist_close(&ds->ds_remap_deadlist); 569 if (ds->ds_prev) 570 dsl_dataset_rele(ds->ds_prev, ds); 571 dsl_dir_rele(ds->ds_dir, ds); 572 list_destroy(&ds->ds_prop_cbs); 573 list_destroy(&ds->ds_sendstreams); 574 mutex_destroy(&ds->ds_lock); 575 mutex_destroy(&ds->ds_opening_lock); 576 mutex_destroy(&ds->ds_sendstream_lock); 577 mutex_destroy(&ds->ds_remap_deadlist_lock); 578 zfs_refcount_destroy(&ds->ds_longholds); 579 rrw_destroy(&ds->ds_bp_rwlock); 580 kmem_free(ds, sizeof (dsl_dataset_t)); 581 if (err != 0) { 582 dmu_buf_rele(dbuf, tag); 583 return (err); 584 } 585 ds = winner; 586 } else { 587 ds->ds_fsid_guid = 588 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 589 if (ds->ds_fsid_guid != 590 dsl_dataset_phys(ds)->ds_fsid_guid) { 591 zfs_dbgmsg("ds_fsid_guid changed from " 592 "%llx to %llx for pool %s dataset id %llu", 593 (long long) 594 dsl_dataset_phys(ds)->ds_fsid_guid, 595 (long long)ds->ds_fsid_guid, 596 spa_name(dp->dp_spa), 597 dsobj); 598 } 599 } 600 } 601 602 ASSERT3P(ds->ds_dbuf, ==, dbuf); 603 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 604 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 605 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 606 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 607 *dsp = ds; 608 609 return (0); 610 } 611 612 int 613 dsl_dataset_create_key_mapping(dsl_dataset_t *ds) 614 { 615 dsl_dir_t *dd = ds->ds_dir; 616 617 if (dd->dd_crypto_obj == 0) 618 return (0); 619 620 return (spa_keystore_create_mapping(dd->dd_pool->dp_spa, 621 ds, ds, &ds->ds_key_mapping)); 622 } 623 624 int 625 dsl_dataset_hold_obj_flags(dsl_pool_t *dp, uint64_t dsobj, 626 ds_hold_flags_t flags, void *tag, dsl_dataset_t **dsp) 627 { 628 int err; 629 630 err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 631 if (err != 0) 632 return (err); 633 634 ASSERT3P(*dsp, !=, NULL); 635 636 if (flags & DS_HOLD_FLAG_DECRYPT) { 637 err = dsl_dataset_create_key_mapping(*dsp); 638 if (err != 0) 639 dsl_dataset_rele(*dsp, tag); 640 } 641 642 return (err); 643 } 644 645 int 646 dsl_dataset_hold_flags(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 647 void *tag, dsl_dataset_t **dsp) 648 { 649 dsl_dir_t *dd; 650 const char *snapname; 651 uint64_t obj; 652 int err = 0; 653 dsl_dataset_t *ds; 654 655 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 656 if (err != 0) 657 return (err); 658 659 ASSERT(dsl_pool_config_held(dp)); 660 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 661 if (obj != 0) 662 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, &ds); 663 else 664 err = SET_ERROR(ENOENT); 665 666 /* we may be looking for a snapshot */ 667 if (err == 0 && snapname != NULL) { 668 dsl_dataset_t *snap_ds; 669 670 if (*snapname++ != '@') { 671 dsl_dataset_rele_flags(ds, flags, tag); 672 dsl_dir_rele(dd, FTAG); 673 return (SET_ERROR(ENOENT)); 674 } 675 676 dprintf("looking for snapshot '%s'\n", snapname); 677 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 678 if (err == 0) { 679 err = dsl_dataset_hold_obj_flags(dp, obj, flags, tag, 680 &snap_ds); 681 } 682 dsl_dataset_rele_flags(ds, flags, tag); 683 684 if (err == 0) { 685 mutex_enter(&snap_ds->ds_lock); 686 if (snap_ds->ds_snapname[0] == 0) 687 (void) strlcpy(snap_ds->ds_snapname, snapname, 688 sizeof (snap_ds->ds_snapname)); 689 mutex_exit(&snap_ds->ds_lock); 690 ds = snap_ds; 691 } 692 } 693 if (err == 0) 694 *dsp = ds; 695 dsl_dir_rele(dd, FTAG); 696 return (err); 697 } 698 699 int 700 dsl_dataset_hold(dsl_pool_t *dp, const char *name, void *tag, 701 dsl_dataset_t **dsp) 702 { 703 return (dsl_dataset_hold_flags(dp, name, 0, tag, dsp)); 704 } 705 706 int 707 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, ds_hold_flags_t flags, 708 void *tag, dsl_dataset_t **dsp) 709 { 710 int err = dsl_dataset_hold_obj_flags(dp, dsobj, flags, tag, dsp); 711 if (err != 0) 712 return (err); 713 if (!dsl_dataset_tryown(*dsp, tag)) { 714 dsl_dataset_rele_flags(*dsp, flags, tag); 715 *dsp = NULL; 716 return (SET_ERROR(EBUSY)); 717 } 718 return (0); 719 } 720 721 int 722 dsl_dataset_own(dsl_pool_t *dp, const char *name, ds_hold_flags_t flags, 723 void *tag, dsl_dataset_t **dsp) 724 { 725 int err = dsl_dataset_hold_flags(dp, name, flags, tag, dsp); 726 if (err != 0) 727 return (err); 728 if (!dsl_dataset_tryown(*dsp, tag)) { 729 dsl_dataset_rele_flags(*dsp, flags, tag); 730 return (SET_ERROR(EBUSY)); 731 } 732 return (0); 733 } 734 735 /* 736 * See the comment above dsl_pool_hold() for details. In summary, a long 737 * hold is used to prevent destruction of a dataset while the pool hold 738 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 739 * 740 * The dataset and pool must be held when this function is called. After it 741 * is called, the pool hold may be released while the dataset is still held 742 * and accessed. 743 */ 744 void 745 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 746 { 747 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 748 (void) zfs_refcount_add(&ds->ds_longholds, tag); 749 } 750 751 void 752 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 753 { 754 (void) zfs_refcount_remove(&ds->ds_longholds, tag); 755 } 756 757 /* Return B_TRUE if there are any long holds on this dataset. */ 758 boolean_t 759 dsl_dataset_long_held(dsl_dataset_t *ds) 760 { 761 return (!zfs_refcount_is_zero(&ds->ds_longholds)); 762 } 763 764 void 765 dsl_dataset_name(dsl_dataset_t *ds, char *name) 766 { 767 if (ds == NULL) { 768 (void) strcpy(name, "mos"); 769 } else { 770 dsl_dir_name(ds->ds_dir, name); 771 VERIFY0(dsl_dataset_get_snapname(ds)); 772 if (ds->ds_snapname[0]) { 773 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 774 <, ZFS_MAX_DATASET_NAME_LEN); 775 /* 776 * We use a "recursive" mutex so that we 777 * can call dprintf_ds() with ds_lock held. 778 */ 779 if (!MUTEX_HELD(&ds->ds_lock)) { 780 mutex_enter(&ds->ds_lock); 781 VERIFY3U(strlcat(name, ds->ds_snapname, 782 ZFS_MAX_DATASET_NAME_LEN), <, 783 ZFS_MAX_DATASET_NAME_LEN); 784 mutex_exit(&ds->ds_lock); 785 } else { 786 VERIFY3U(strlcat(name, ds->ds_snapname, 787 ZFS_MAX_DATASET_NAME_LEN), <, 788 ZFS_MAX_DATASET_NAME_LEN); 789 } 790 } 791 } 792 } 793 794 int 795 dsl_dataset_namelen(dsl_dataset_t *ds) 796 { 797 VERIFY0(dsl_dataset_get_snapname(ds)); 798 mutex_enter(&ds->ds_lock); 799 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 800 mutex_exit(&ds->ds_lock); 801 return (len); 802 } 803 804 void 805 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 806 { 807 dmu_buf_rele(ds->ds_dbuf, tag); 808 } 809 810 void 811 dsl_dataset_remove_key_mapping(dsl_dataset_t *ds) 812 { 813 dsl_dir_t *dd = ds->ds_dir; 814 815 if (dd == NULL || dd->dd_crypto_obj == 0) 816 return; 817 818 (void) spa_keystore_remove_mapping(dd->dd_pool->dp_spa, 819 ds->ds_object, ds); 820 } 821 822 void 823 dsl_dataset_rele_flags(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 824 { 825 if (flags & DS_HOLD_FLAG_DECRYPT) 826 dsl_dataset_remove_key_mapping(ds); 827 828 dsl_dataset_rele(ds, tag); 829 } 830 831 void 832 dsl_dataset_disown(dsl_dataset_t *ds, ds_hold_flags_t flags, void *tag) 833 { 834 ASSERT3P(ds->ds_owner, ==, tag); 835 ASSERT(ds->ds_dbuf != NULL); 836 837 mutex_enter(&ds->ds_lock); 838 ds->ds_owner = NULL; 839 mutex_exit(&ds->ds_lock); 840 dsl_dataset_long_rele(ds, tag); 841 dsl_dataset_rele_flags(ds, flags, tag); 842 } 843 844 boolean_t 845 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 846 { 847 boolean_t gotit = FALSE; 848 849 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 850 mutex_enter(&ds->ds_lock); 851 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 852 ds->ds_owner = tag; 853 dsl_dataset_long_hold(ds, tag); 854 gotit = TRUE; 855 } 856 mutex_exit(&ds->ds_lock); 857 return (gotit); 858 } 859 860 boolean_t 861 dsl_dataset_has_owner(dsl_dataset_t *ds) 862 { 863 boolean_t rv; 864 mutex_enter(&ds->ds_lock); 865 rv = (ds->ds_owner != NULL); 866 mutex_exit(&ds->ds_lock); 867 return (rv); 868 } 869 870 void 871 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 872 { 873 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 874 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 875 uint64_t zero = 0; 876 877 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 878 879 spa_feature_incr(spa, f, tx); 880 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 881 882 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 883 sizeof (zero), 1, &zero, tx)); 884 } 885 886 void 887 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 888 { 889 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 890 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 891 892 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 893 894 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 895 spa_feature_decr(spa, f, tx); 896 } 897 898 uint64_t 899 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 900 dsl_crypto_params_t *dcp, uint64_t flags, dmu_tx_t *tx) 901 { 902 dsl_pool_t *dp = dd->dd_pool; 903 dmu_buf_t *dbuf; 904 dsl_dataset_phys_t *dsphys; 905 uint64_t dsobj; 906 objset_t *mos = dp->dp_meta_objset; 907 908 if (origin == NULL) 909 origin = dp->dp_origin_snap; 910 911 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 912 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 913 ASSERT(dmu_tx_is_syncing(tx)); 914 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 915 916 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 917 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 918 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 919 dmu_buf_will_dirty(dbuf, tx); 920 dsphys = dbuf->db_data; 921 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 922 dsphys->ds_dir_obj = dd->dd_object; 923 dsphys->ds_flags = flags; 924 dsphys->ds_fsid_guid = unique_create(); 925 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 926 sizeof (dsphys->ds_guid)); 927 dsphys->ds_snapnames_zapobj = 928 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 929 DMU_OT_NONE, 0, tx); 930 dsphys->ds_creation_time = gethrestime_sec(); 931 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 932 933 if (origin == NULL) { 934 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 935 } else { 936 dsl_dataset_t *ohds; /* head of the origin snapshot */ 937 938 dsphys->ds_prev_snap_obj = origin->ds_object; 939 dsphys->ds_prev_snap_txg = 940 dsl_dataset_phys(origin)->ds_creation_txg; 941 dsphys->ds_referenced_bytes = 942 dsl_dataset_phys(origin)->ds_referenced_bytes; 943 dsphys->ds_compressed_bytes = 944 dsl_dataset_phys(origin)->ds_compressed_bytes; 945 dsphys->ds_uncompressed_bytes = 946 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 947 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 948 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 949 rrw_exit(&origin->ds_bp_rwlock, FTAG); 950 951 /* 952 * Inherit flags that describe the dataset's contents 953 * (INCONSISTENT) or properties (Case Insensitive). 954 */ 955 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 956 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 957 958 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 959 if (origin->ds_feature_inuse[f]) 960 dsl_dataset_activate_feature(dsobj, f, tx); 961 } 962 963 dmu_buf_will_dirty(origin->ds_dbuf, tx); 964 dsl_dataset_phys(origin)->ds_num_children++; 965 966 VERIFY0(dsl_dataset_hold_obj(dp, 967 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 968 FTAG, &ohds)); 969 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 970 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 971 dsl_dataset_rele(ohds, FTAG); 972 973 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 974 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 975 dsl_dataset_phys(origin)->ds_next_clones_obj = 976 zap_create(mos, 977 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 978 } 979 VERIFY0(zap_add_int(mos, 980 dsl_dataset_phys(origin)->ds_next_clones_obj, 981 dsobj, tx)); 982 } 983 984 dmu_buf_will_dirty(dd->dd_dbuf, tx); 985 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 986 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 987 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 988 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 989 dsl_dir_phys(origin->ds_dir)->dd_clones = 990 zap_create(mos, 991 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 992 } 993 VERIFY0(zap_add_int(mos, 994 dsl_dir_phys(origin->ds_dir)->dd_clones, 995 dsobj, tx)); 996 } 997 } 998 999 /* handle encryption */ 1000 dsl_dataset_create_crypt_sync(dsobj, dd, origin, dcp, tx); 1001 1002 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1003 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1004 1005 dmu_buf_rele(dbuf, FTAG); 1006 1007 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1008 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 1009 1010 return (dsobj); 1011 } 1012 1013 static void 1014 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 1015 { 1016 objset_t *os; 1017 1018 VERIFY0(dmu_objset_from_ds(ds, &os)); 1019 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 1020 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1021 zio_t *zio; 1022 1023 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 1024 if (os->os_encrypted) 1025 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_TRUE; 1026 1027 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1028 dsl_dataset_sync(ds, zio, tx); 1029 VERIFY0(zio_wait(zio)); 1030 1031 /* dsl_dataset_sync_done will drop this reference. */ 1032 dmu_buf_add_ref(ds->ds_dbuf, ds); 1033 dsl_dataset_sync_done(ds, tx); 1034 } 1035 } 1036 1037 uint64_t 1038 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 1039 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, 1040 dsl_crypto_params_t *dcp, dmu_tx_t *tx) 1041 { 1042 dsl_pool_t *dp = pdd->dd_pool; 1043 uint64_t dsobj, ddobj; 1044 dsl_dir_t *dd; 1045 1046 ASSERT(dmu_tx_is_syncing(tx)); 1047 ASSERT(lastname[0] != '@'); 1048 1049 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 1050 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 1051 1052 dsobj = dsl_dataset_create_sync_dd(dd, origin, dcp, 1053 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 1054 1055 dsl_deleg_set_create_perms(dd, tx, cr); 1056 1057 /* 1058 * Since we're creating a new node we know it's a leaf, so we can 1059 * initialize the counts if the limit feature is active. 1060 */ 1061 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 1062 uint64_t cnt = 0; 1063 objset_t *os = dd->dd_pool->dp_meta_objset; 1064 1065 dsl_dir_zapify(dd, tx); 1066 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 1067 sizeof (cnt), 1, &cnt, tx)); 1068 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 1069 sizeof (cnt), 1, &cnt, tx)); 1070 } 1071 1072 dsl_dir_rele(dd, FTAG); 1073 1074 /* 1075 * If we are creating a clone, make sure we zero out any stale 1076 * data from the origin snapshots zil header. 1077 */ 1078 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 1079 dsl_dataset_t *ds; 1080 1081 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1082 dsl_dataset_zero_zil(ds, tx); 1083 dsl_dataset_rele(ds, FTAG); 1084 } 1085 1086 return (dsobj); 1087 } 1088 1089 /* 1090 * The unique space in the head dataset can be calculated by subtracting 1091 * the space used in the most recent snapshot, that is still being used 1092 * in this file system, from the space currently in use. To figure out 1093 * the space in the most recent snapshot still in use, we need to take 1094 * the total space used in the snapshot and subtract out the space that 1095 * has been freed up since the snapshot was taken. 1096 */ 1097 void 1098 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1099 { 1100 uint64_t mrs_used; 1101 uint64_t dlused, dlcomp, dluncomp; 1102 1103 ASSERT(!ds->ds_is_snapshot); 1104 1105 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1106 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1107 else 1108 mrs_used = 0; 1109 1110 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1111 1112 ASSERT3U(dlused, <=, mrs_used); 1113 dsl_dataset_phys(ds)->ds_unique_bytes = 1114 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1115 1116 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1117 SPA_VERSION_UNIQUE_ACCURATE) 1118 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1119 } 1120 1121 void 1122 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1123 dmu_tx_t *tx) 1124 { 1125 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1126 uint64_t count; 1127 int err; 1128 1129 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1130 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1131 obj, tx); 1132 /* 1133 * The err should not be ENOENT, but a bug in a previous version 1134 * of the code could cause upgrade_clones_cb() to not set 1135 * ds_next_snap_obj when it should, leading to a missing entry. 1136 * If we knew that the pool was created after 1137 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1138 * ENOENT. However, at least we can check that we don't have 1139 * too many entries in the next_clones_obj even after failing to 1140 * remove this one. 1141 */ 1142 if (err != ENOENT) 1143 VERIFY0(err); 1144 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1145 &count)); 1146 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1147 } 1148 1149 1150 blkptr_t * 1151 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1152 { 1153 return (&dsl_dataset_phys(ds)->ds_bp); 1154 } 1155 1156 spa_t * 1157 dsl_dataset_get_spa(dsl_dataset_t *ds) 1158 { 1159 return (ds->ds_dir->dd_pool->dp_spa); 1160 } 1161 1162 void 1163 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1164 { 1165 dsl_pool_t *dp; 1166 1167 if (ds == NULL) /* this is the meta-objset */ 1168 return; 1169 1170 ASSERT(ds->ds_objset != NULL); 1171 1172 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1173 panic("dirtying snapshot!"); 1174 1175 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1176 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1177 1178 dp = ds->ds_dir->dd_pool; 1179 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1180 objset_t *os = ds->ds_objset; 1181 1182 /* up the hold count until we can be written out */ 1183 dmu_buf_add_ref(ds->ds_dbuf, ds); 1184 1185 /* if this dataset is encrypted, grab a reference to the DCK */ 1186 if (ds->ds_dir->dd_crypto_obj != 0 && 1187 !os->os_raw_receive && 1188 !os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1189 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1190 key_mapping_add_ref(ds->ds_key_mapping, ds); 1191 } 1192 } 1193 } 1194 1195 boolean_t 1196 dsl_dataset_is_dirty(dsl_dataset_t *ds) 1197 { 1198 for (int t = 0; t < TXG_SIZE; t++) { 1199 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1200 ds, t)) 1201 return (B_TRUE); 1202 } 1203 return (B_FALSE); 1204 } 1205 1206 static int 1207 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1208 { 1209 uint64_t asize; 1210 1211 if (!dmu_tx_is_syncing(tx)) 1212 return (0); 1213 1214 /* 1215 * If there's an fs-only reservation, any blocks that might become 1216 * owned by the snapshot dataset must be accommodated by space 1217 * outside of the reservation. 1218 */ 1219 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1220 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1221 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1222 return (SET_ERROR(ENOSPC)); 1223 1224 /* 1225 * Propagate any reserved space for this snapshot to other 1226 * snapshot checks in this sync group. 1227 */ 1228 if (asize > 0) 1229 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1230 1231 return (0); 1232 } 1233 1234 int 1235 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1236 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1237 { 1238 int error; 1239 uint64_t value; 1240 1241 ds->ds_trysnap_txg = tx->tx_txg; 1242 1243 if (!dmu_tx_is_syncing(tx)) 1244 return (0); 1245 1246 /* 1247 * We don't allow multiple snapshots of the same txg. If there 1248 * is already one, try again. 1249 */ 1250 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1251 return (SET_ERROR(EAGAIN)); 1252 1253 /* 1254 * Check for conflicting snapshot name. 1255 */ 1256 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1257 if (error == 0) 1258 return (SET_ERROR(EEXIST)); 1259 if (error != ENOENT) 1260 return (error); 1261 1262 /* 1263 * We don't allow taking snapshots of inconsistent datasets, such as 1264 * those into which we are currently receiving. However, if we are 1265 * creating this snapshot as part of a receive, this check will be 1266 * executed atomically with respect to the completion of the receive 1267 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1268 * case we ignore this, knowing it will be fixed up for us shortly in 1269 * dmu_recv_end_sync(). 1270 */ 1271 if (!recv && DS_IS_INCONSISTENT(ds)) 1272 return (SET_ERROR(EBUSY)); 1273 1274 /* 1275 * Skip the check for temporary snapshots or if we have already checked 1276 * the counts in dsl_dataset_snapshot_check. This means we really only 1277 * check the count here when we're receiving a stream. 1278 */ 1279 if (cnt != 0 && cr != NULL) { 1280 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1281 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1282 if (error != 0) 1283 return (error); 1284 } 1285 1286 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1287 if (error != 0) 1288 return (error); 1289 1290 return (0); 1291 } 1292 1293 int 1294 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1295 { 1296 dsl_dataset_snapshot_arg_t *ddsa = arg; 1297 dsl_pool_t *dp = dmu_tx_pool(tx); 1298 nvpair_t *pair; 1299 int rv = 0; 1300 1301 /* 1302 * Pre-compute how many total new snapshots will be created for each 1303 * level in the tree and below. This is needed for validating the 1304 * snapshot limit when either taking a recursive snapshot or when 1305 * taking multiple snapshots. 1306 * 1307 * The problem is that the counts are not actually adjusted when 1308 * we are checking, only when we finally sync. For a single snapshot, 1309 * this is easy, the count will increase by 1 at each node up the tree, 1310 * but its more complicated for the recursive/multiple snapshot case. 1311 * 1312 * The dsl_fs_ss_limit_check function does recursively check the count 1313 * at each level up the tree but since it is validating each snapshot 1314 * independently we need to be sure that we are validating the complete 1315 * count for the entire set of snapshots. We do this by rolling up the 1316 * counts for each component of the name into an nvlist and then 1317 * checking each of those cases with the aggregated count. 1318 * 1319 * This approach properly handles not only the recursive snapshot 1320 * case (where we get all of those on the ddsa_snaps list) but also 1321 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1322 * validate the limit on 'a' using a count of 2). 1323 * 1324 * We validate the snapshot names in the third loop and only report 1325 * name errors once. 1326 */ 1327 if (dmu_tx_is_syncing(tx)) { 1328 nvlist_t *cnt_track = NULL; 1329 cnt_track = fnvlist_alloc(); 1330 1331 /* Rollup aggregated counts into the cnt_track list */ 1332 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1333 pair != NULL; 1334 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1335 char *pdelim; 1336 uint64_t val; 1337 char nm[MAXPATHLEN]; 1338 1339 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1340 pdelim = strchr(nm, '@'); 1341 if (pdelim == NULL) 1342 continue; 1343 *pdelim = '\0'; 1344 1345 do { 1346 if (nvlist_lookup_uint64(cnt_track, nm, 1347 &val) == 0) { 1348 /* update existing entry */ 1349 fnvlist_add_uint64(cnt_track, nm, 1350 val + 1); 1351 } else { 1352 /* add to list */ 1353 fnvlist_add_uint64(cnt_track, nm, 1); 1354 } 1355 1356 pdelim = strrchr(nm, '/'); 1357 if (pdelim != NULL) 1358 *pdelim = '\0'; 1359 } while (pdelim != NULL); 1360 } 1361 1362 /* Check aggregated counts at each level */ 1363 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1364 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1365 int error = 0; 1366 char *name; 1367 uint64_t cnt = 0; 1368 dsl_dataset_t *ds; 1369 1370 name = nvpair_name(pair); 1371 cnt = fnvpair_value_uint64(pair); 1372 ASSERT(cnt > 0); 1373 1374 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1375 if (error == 0) { 1376 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1377 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1378 ddsa->ddsa_cr); 1379 dsl_dataset_rele(ds, FTAG); 1380 } 1381 1382 if (error != 0) { 1383 if (ddsa->ddsa_errors != NULL) 1384 fnvlist_add_int32(ddsa->ddsa_errors, 1385 name, error); 1386 rv = error; 1387 /* only report one error for this check */ 1388 break; 1389 } 1390 } 1391 nvlist_free(cnt_track); 1392 } 1393 1394 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1395 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1396 int error = 0; 1397 dsl_dataset_t *ds; 1398 char *name, *atp; 1399 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1400 1401 name = nvpair_name(pair); 1402 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1403 error = SET_ERROR(ENAMETOOLONG); 1404 if (error == 0) { 1405 atp = strchr(name, '@'); 1406 if (atp == NULL) 1407 error = SET_ERROR(EINVAL); 1408 if (error == 0) 1409 (void) strlcpy(dsname, name, atp - name + 1); 1410 } 1411 if (error == 0) 1412 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1413 if (error == 0) { 1414 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1415 error = dsl_dataset_snapshot_check_impl(ds, 1416 atp + 1, tx, B_FALSE, 0, NULL); 1417 dsl_dataset_rele(ds, FTAG); 1418 } 1419 1420 if (error != 0) { 1421 if (ddsa->ddsa_errors != NULL) { 1422 fnvlist_add_int32(ddsa->ddsa_errors, 1423 name, error); 1424 } 1425 rv = error; 1426 } 1427 } 1428 1429 return (rv); 1430 } 1431 1432 void 1433 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1434 dmu_tx_t *tx) 1435 { 1436 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1437 dmu_buf_t *dbuf; 1438 dsl_dataset_phys_t *dsphys; 1439 uint64_t dsobj, crtxg; 1440 objset_t *mos = dp->dp_meta_objset; 1441 objset_t *os; 1442 1443 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1444 1445 /* 1446 * If we are on an old pool, the zil must not be active, in which 1447 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1448 */ 1449 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1450 dmu_objset_from_ds(ds, &os) != 0 || 1451 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1452 sizeof (zero_zil)) == 0); 1453 1454 /* Should not snapshot a dirty dataset. */ 1455 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1456 ds, tx->tx_txg)); 1457 1458 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1459 1460 /* 1461 * The origin's ds_creation_txg has to be < TXG_INITIAL 1462 */ 1463 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1464 crtxg = 1; 1465 else 1466 crtxg = tx->tx_txg; 1467 1468 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1469 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1470 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1471 dmu_buf_will_dirty(dbuf, tx); 1472 dsphys = dbuf->db_data; 1473 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1474 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1475 dsphys->ds_fsid_guid = unique_create(); 1476 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1477 sizeof (dsphys->ds_guid)); 1478 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1479 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1480 dsphys->ds_next_snap_obj = ds->ds_object; 1481 dsphys->ds_num_children = 1; 1482 dsphys->ds_creation_time = gethrestime_sec(); 1483 dsphys->ds_creation_txg = crtxg; 1484 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1485 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1486 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1487 dsphys->ds_uncompressed_bytes = 1488 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1489 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1490 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1491 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1492 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1493 dmu_buf_rele(dbuf, FTAG); 1494 1495 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1496 if (ds->ds_feature_inuse[f]) 1497 dsl_dataset_activate_feature(dsobj, f, tx); 1498 } 1499 1500 ASSERT3U(ds->ds_prev != 0, ==, 1501 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1502 if (ds->ds_prev) { 1503 uint64_t next_clones_obj = 1504 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1505 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1506 ds->ds_object || 1507 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1508 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1509 ds->ds_object) { 1510 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1511 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1512 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1513 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1514 } else if (next_clones_obj != 0) { 1515 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1516 dsphys->ds_next_snap_obj, tx); 1517 VERIFY0(zap_add_int(mos, 1518 next_clones_obj, dsobj, tx)); 1519 } 1520 } 1521 1522 /* 1523 * If we have a reference-reservation on this dataset, we will 1524 * need to increase the amount of refreservation being charged 1525 * since our unique space is going to zero. 1526 */ 1527 if (ds->ds_reserved) { 1528 int64_t delta; 1529 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1530 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1531 ds->ds_reserved); 1532 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1533 delta, 0, 0, tx); 1534 } 1535 1536 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1537 dsl_dataset_phys(ds)->ds_deadlist_obj = 1538 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1539 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1540 dsl_deadlist_close(&ds->ds_deadlist); 1541 dsl_deadlist_open(&ds->ds_deadlist, mos, 1542 dsl_dataset_phys(ds)->ds_deadlist_obj); 1543 dsl_deadlist_add_key(&ds->ds_deadlist, 1544 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1545 1546 if (dsl_dataset_remap_deadlist_exists(ds)) { 1547 uint64_t remap_deadlist_obj = 1548 dsl_dataset_get_remap_deadlist_object(ds); 1549 /* 1550 * Move the remap_deadlist to the snapshot. The head 1551 * will create a new remap deadlist on demand, from 1552 * dsl_dataset_block_remapped(). 1553 */ 1554 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1555 dsl_deadlist_close(&ds->ds_remap_deadlist); 1556 1557 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1558 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1559 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1560 } 1561 1562 /* 1563 * Create a ivset guid for this snapshot if the dataset is 1564 * encrypted. This may be overridden by a raw receive. A 1565 * previous implementation of this code did not have this 1566 * field as part of the on-disk format for ZFS encryption 1567 * (see errata #4). As part of the remediation for this 1568 * issue, we ask the user to enable the bookmark_v2 feature 1569 * which is now a dependency of the encryption feature. We 1570 * use this as a heuristic to determine when the user has 1571 * elected to correct any datasets created with the old code. 1572 * As a result, we only do this step if the bookmark_v2 1573 * feature is enabled, which limits the number of states a 1574 * given pool / dataset can be in with regards to terms of 1575 * correcting the issue. 1576 */ 1577 if (ds->ds_dir->dd_crypto_obj != 0 && 1578 spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_BOOKMARK_V2)) { 1579 uint64_t ivset_guid = unique_create(); 1580 1581 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1582 VERIFY0(zap_add(mos, dsobj, DS_FIELD_IVSET_GUID, 1583 sizeof (ivset_guid), 1, &ivset_guid, tx)); 1584 } 1585 1586 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1587 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1588 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1589 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1590 1591 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1592 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1593 1594 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1595 snapname, 8, 1, &dsobj, tx)); 1596 1597 if (ds->ds_prev) 1598 dsl_dataset_rele(ds->ds_prev, ds); 1599 VERIFY0(dsl_dataset_hold_obj(dp, 1600 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1601 1602 dsl_scan_ds_snapshotted(ds, tx); 1603 1604 dsl_dir_snap_cmtime_update(ds->ds_dir); 1605 1606 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1607 } 1608 1609 void 1610 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1611 { 1612 dsl_dataset_snapshot_arg_t *ddsa = arg; 1613 dsl_pool_t *dp = dmu_tx_pool(tx); 1614 nvpair_t *pair; 1615 1616 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1617 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1618 dsl_dataset_t *ds; 1619 char *name, *atp; 1620 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1621 1622 name = nvpair_name(pair); 1623 atp = strchr(name, '@'); 1624 (void) strlcpy(dsname, name, atp - name + 1); 1625 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1626 1627 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1628 if (ddsa->ddsa_props != NULL) { 1629 dsl_props_set_sync_impl(ds->ds_prev, 1630 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1631 } 1632 dsl_dataset_rele(ds, FTAG); 1633 } 1634 } 1635 1636 /* 1637 * The snapshots must all be in the same pool. 1638 * All-or-nothing: if there are any failures, nothing will be modified. 1639 */ 1640 int 1641 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1642 { 1643 dsl_dataset_snapshot_arg_t ddsa; 1644 nvpair_t *pair; 1645 boolean_t needsuspend; 1646 int error; 1647 spa_t *spa; 1648 char *firstname; 1649 nvlist_t *suspended = NULL; 1650 1651 pair = nvlist_next_nvpair(snaps, NULL); 1652 if (pair == NULL) 1653 return (0); 1654 firstname = nvpair_name(pair); 1655 1656 error = spa_open(firstname, &spa, FTAG); 1657 if (error != 0) 1658 return (error); 1659 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1660 spa_close(spa, FTAG); 1661 1662 if (needsuspend) { 1663 suspended = fnvlist_alloc(); 1664 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1665 pair = nvlist_next_nvpair(snaps, pair)) { 1666 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1667 char *snapname = nvpair_name(pair); 1668 char *atp; 1669 void *cookie; 1670 1671 atp = strchr(snapname, '@'); 1672 if (atp == NULL) { 1673 error = SET_ERROR(EINVAL); 1674 break; 1675 } 1676 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1677 1678 error = zil_suspend(fsname, &cookie); 1679 if (error != 0) 1680 break; 1681 fnvlist_add_uint64(suspended, fsname, 1682 (uintptr_t)cookie); 1683 } 1684 } 1685 1686 ddsa.ddsa_snaps = snaps; 1687 ddsa.ddsa_props = props; 1688 ddsa.ddsa_errors = errors; 1689 ddsa.ddsa_cr = CRED(); 1690 1691 if (error == 0) { 1692 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1693 dsl_dataset_snapshot_sync, &ddsa, 1694 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1695 } 1696 1697 if (suspended != NULL) { 1698 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1699 pair = nvlist_next_nvpair(suspended, pair)) { 1700 zil_resume((void *)(uintptr_t) 1701 fnvpair_value_uint64(pair)); 1702 } 1703 fnvlist_free(suspended); 1704 } 1705 1706 return (error); 1707 } 1708 1709 typedef struct dsl_dataset_snapshot_tmp_arg { 1710 const char *ddsta_fsname; 1711 const char *ddsta_snapname; 1712 minor_t ddsta_cleanup_minor; 1713 const char *ddsta_htag; 1714 } dsl_dataset_snapshot_tmp_arg_t; 1715 1716 static int 1717 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1718 { 1719 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1720 dsl_pool_t *dp = dmu_tx_pool(tx); 1721 dsl_dataset_t *ds; 1722 int error; 1723 1724 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1725 if (error != 0) 1726 return (error); 1727 1728 /* NULL cred means no limit check for tmp snapshot */ 1729 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1730 tx, B_FALSE, 0, NULL); 1731 if (error != 0) { 1732 dsl_dataset_rele(ds, FTAG); 1733 return (error); 1734 } 1735 1736 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1737 dsl_dataset_rele(ds, FTAG); 1738 return (SET_ERROR(ENOTSUP)); 1739 } 1740 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1741 B_TRUE, tx); 1742 if (error != 0) { 1743 dsl_dataset_rele(ds, FTAG); 1744 return (error); 1745 } 1746 1747 dsl_dataset_rele(ds, FTAG); 1748 return (0); 1749 } 1750 1751 static void 1752 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1753 { 1754 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1755 dsl_pool_t *dp = dmu_tx_pool(tx); 1756 dsl_dataset_t *ds; 1757 1758 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1759 1760 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1761 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1762 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1763 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1764 1765 dsl_dataset_rele(ds, FTAG); 1766 } 1767 1768 int 1769 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1770 minor_t cleanup_minor, const char *htag) 1771 { 1772 dsl_dataset_snapshot_tmp_arg_t ddsta; 1773 int error; 1774 spa_t *spa; 1775 boolean_t needsuspend; 1776 void *cookie; 1777 1778 ddsta.ddsta_fsname = fsname; 1779 ddsta.ddsta_snapname = snapname; 1780 ddsta.ddsta_cleanup_minor = cleanup_minor; 1781 ddsta.ddsta_htag = htag; 1782 1783 error = spa_open(fsname, &spa, FTAG); 1784 if (error != 0) 1785 return (error); 1786 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1787 spa_close(spa, FTAG); 1788 1789 if (needsuspend) { 1790 error = zil_suspend(fsname, &cookie); 1791 if (error != 0) 1792 return (error); 1793 } 1794 1795 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1796 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1797 1798 if (needsuspend) 1799 zil_resume(cookie); 1800 return (error); 1801 } 1802 1803 void 1804 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1805 { 1806 ASSERT(dmu_tx_is_syncing(tx)); 1807 ASSERT(ds->ds_objset != NULL); 1808 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1809 1810 /* 1811 * in case we had to change ds_fsid_guid when we opened it, 1812 * sync it out now. 1813 */ 1814 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1815 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1816 1817 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1818 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1819 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1820 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1821 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1822 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1823 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1824 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1825 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1826 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1827 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1828 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1829 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1830 } 1831 1832 dmu_objset_sync(ds->ds_objset, zio, tx); 1833 1834 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1835 if (ds->ds_feature_activation_needed[f]) { 1836 if (ds->ds_feature_inuse[f]) 1837 continue; 1838 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1839 ds->ds_feature_inuse[f] = B_TRUE; 1840 } 1841 } 1842 } 1843 1844 static int 1845 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 1846 { 1847 dsl_deadlist_t *dl = arg; 1848 dsl_deadlist_insert(dl, bp, tx); 1849 return (0); 1850 } 1851 1852 void 1853 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 1854 { 1855 objset_t *os = ds->ds_objset; 1856 1857 bplist_iterate(&ds->ds_pending_deadlist, 1858 deadlist_enqueue_cb, &ds->ds_deadlist, tx); 1859 1860 if (os->os_synced_dnodes != NULL) { 1861 multilist_destroy(os->os_synced_dnodes); 1862 os->os_synced_dnodes = NULL; 1863 } 1864 1865 if (os->os_encrypted) 1866 os->os_next_write_raw[tx->tx_txg & TXG_MASK] = B_FALSE; 1867 else 1868 ASSERT0(os->os_next_write_raw[tx->tx_txg & TXG_MASK]); 1869 1870 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 1871 1872 dmu_buf_rele(ds->ds_dbuf, ds); 1873 } 1874 1875 int 1876 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 1877 { 1878 uint64_t count = 0; 1879 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1880 zap_cursor_t zc; 1881 zap_attribute_t za; 1882 1883 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1884 1885 /* 1886 * There may be missing entries in ds_next_clones_obj 1887 * due to a bug in a previous version of the code. 1888 * Only trust it if it has the right number of entries. 1889 */ 1890 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1891 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1892 &count)); 1893 } 1894 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 1895 return (ENOENT); 1896 } 1897 for (zap_cursor_init(&zc, mos, 1898 dsl_dataset_phys(ds)->ds_next_clones_obj); 1899 zap_cursor_retrieve(&zc, &za) == 0; 1900 zap_cursor_advance(&zc)) { 1901 dsl_dataset_t *clone; 1902 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1903 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1904 za.za_first_integer, FTAG, &clone)); 1905 dsl_dir_name(clone->ds_dir, buf); 1906 fnvlist_add_boolean(val, buf); 1907 dsl_dataset_rele(clone, FTAG); 1908 } 1909 zap_cursor_fini(&zc); 1910 return (0); 1911 } 1912 1913 void 1914 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1915 { 1916 nvlist_t *propval = fnvlist_alloc(); 1917 nvlist_t *val; 1918 1919 /* 1920 * We use nvlist_alloc() instead of fnvlist_alloc() because the 1921 * latter would allocate the list with NV_UNIQUE_NAME flag. 1922 * As a result, every time a clone name is appended to the list 1923 * it would be (linearly) searched for for a duplicate name. 1924 * We already know that all clone names must be unique and we 1925 * want avoid the quadratic complexity of double-checking that 1926 * because we can have a large number of clones. 1927 */ 1928 VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP)); 1929 1930 if (get_clones_stat_impl(ds, val) == 0) { 1931 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1932 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 1933 propval); 1934 } 1935 1936 nvlist_free(val); 1937 nvlist_free(propval); 1938 } 1939 1940 /* 1941 * Returns a string that represents the receive resume stats token. It should 1942 * be freed with strfree(). 1943 */ 1944 char * 1945 get_receive_resume_stats_impl(dsl_dataset_t *ds) 1946 { 1947 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1948 1949 if (dsl_dataset_has_resume_receive_state(ds)) { 1950 char *str; 1951 void *packed; 1952 uint8_t *compressed; 1953 uint64_t val; 1954 nvlist_t *token_nv = fnvlist_alloc(); 1955 size_t packed_size, compressed_size; 1956 1957 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1958 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1959 fnvlist_add_uint64(token_nv, "fromguid", val); 1960 } 1961 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1962 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1963 fnvlist_add_uint64(token_nv, "object", val); 1964 } 1965 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1966 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1967 fnvlist_add_uint64(token_nv, "offset", val); 1968 } 1969 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1970 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1971 fnvlist_add_uint64(token_nv, "bytes", val); 1972 } 1973 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1974 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1975 fnvlist_add_uint64(token_nv, "toguid", val); 1976 } 1977 char buf[256]; 1978 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1979 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1980 fnvlist_add_string(token_nv, "toname", buf); 1981 } 1982 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1983 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 1984 fnvlist_add_boolean(token_nv, "largeblockok"); 1985 } 1986 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1987 DS_FIELD_RESUME_EMBEDOK) == 0) { 1988 fnvlist_add_boolean(token_nv, "embedok"); 1989 } 1990 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1991 DS_FIELD_RESUME_COMPRESSOK) == 0) { 1992 fnvlist_add_boolean(token_nv, "compressok"); 1993 } 1994 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1995 DS_FIELD_RESUME_RAWOK) == 0) { 1996 fnvlist_add_boolean(token_nv, "rawok"); 1997 } 1998 packed = fnvlist_pack(token_nv, &packed_size); 1999 fnvlist_free(token_nv); 2000 compressed = kmem_alloc(packed_size, KM_SLEEP); 2001 2002 compressed_size = gzip_compress(packed, compressed, 2003 packed_size, packed_size, 6); 2004 2005 zio_cksum_t cksum; 2006 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 2007 2008 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 2009 for (int i = 0; i < compressed_size; i++) { 2010 (void) sprintf(str + i * 2, "%02x", compressed[i]); 2011 } 2012 str[compressed_size * 2] = '\0'; 2013 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 2014 ZFS_SEND_RESUME_TOKEN_VERSION, 2015 (longlong_t)cksum.zc_word[0], 2016 (longlong_t)packed_size, str); 2017 kmem_free(packed, packed_size); 2018 kmem_free(str, compressed_size * 2 + 1); 2019 kmem_free(compressed, packed_size); 2020 return (propval); 2021 } 2022 return (strdup("")); 2023 } 2024 2025 /* 2026 * Returns a string that represents the receive resume stats token of the 2027 * dataset's child. It should be freed with strfree(). 2028 */ 2029 char * 2030 get_child_receive_stats(dsl_dataset_t *ds) 2031 { 2032 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 2033 dsl_dataset_t *recv_ds; 2034 dsl_dataset_name(ds, recvname); 2035 if (strlcat(recvname, "/", sizeof (recvname)) < 2036 sizeof (recvname) && 2037 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2038 sizeof (recvname) && 2039 dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG, 2040 &recv_ds) == 0) { 2041 char *propval = get_receive_resume_stats_impl(recv_ds); 2042 dsl_dataset_rele(recv_ds, FTAG); 2043 return (propval); 2044 } 2045 return (strdup("")); 2046 } 2047 2048 static void 2049 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 2050 { 2051 char *propval = get_receive_resume_stats_impl(ds); 2052 if (strcmp(propval, "") != 0) { 2053 dsl_prop_nvlist_add_string(nv, 2054 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 2055 } else { 2056 char *childval = get_child_receive_stats(ds); 2057 if (strcmp(childval, "") != 0) { 2058 dsl_prop_nvlist_add_string(nv, 2059 ZFS_PROP_RECEIVE_RESUME_TOKEN, childval); 2060 } 2061 strfree(childval); 2062 } 2063 strfree(propval); 2064 } 2065 2066 uint64_t 2067 dsl_get_refratio(dsl_dataset_t *ds) 2068 { 2069 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 2070 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 2071 dsl_dataset_phys(ds)->ds_compressed_bytes); 2072 return (ratio); 2073 } 2074 2075 uint64_t 2076 dsl_get_logicalreferenced(dsl_dataset_t *ds) 2077 { 2078 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 2079 } 2080 2081 uint64_t 2082 dsl_get_compressratio(dsl_dataset_t *ds) 2083 { 2084 if (ds->ds_is_snapshot) { 2085 return (dsl_get_refratio(ds)); 2086 } else { 2087 dsl_dir_t *dd = ds->ds_dir; 2088 mutex_enter(&dd->dd_lock); 2089 uint64_t val = dsl_dir_get_compressratio(dd); 2090 mutex_exit(&dd->dd_lock); 2091 return (val); 2092 } 2093 } 2094 2095 uint64_t 2096 dsl_get_used(dsl_dataset_t *ds) 2097 { 2098 if (ds->ds_is_snapshot) { 2099 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2100 } else { 2101 dsl_dir_t *dd = ds->ds_dir; 2102 mutex_enter(&dd->dd_lock); 2103 uint64_t val = dsl_dir_get_used(dd); 2104 mutex_exit(&dd->dd_lock); 2105 return (val); 2106 } 2107 } 2108 2109 uint64_t 2110 dsl_get_creation(dsl_dataset_t *ds) 2111 { 2112 return (dsl_dataset_phys(ds)->ds_creation_time); 2113 } 2114 2115 uint64_t 2116 dsl_get_creationtxg(dsl_dataset_t *ds) 2117 { 2118 return (dsl_dataset_phys(ds)->ds_creation_txg); 2119 } 2120 2121 uint64_t 2122 dsl_get_refquota(dsl_dataset_t *ds) 2123 { 2124 return (ds->ds_quota); 2125 } 2126 2127 uint64_t 2128 dsl_get_refreservation(dsl_dataset_t *ds) 2129 { 2130 return (ds->ds_reserved); 2131 } 2132 2133 uint64_t 2134 dsl_get_guid(dsl_dataset_t *ds) 2135 { 2136 return (dsl_dataset_phys(ds)->ds_guid); 2137 } 2138 2139 uint64_t 2140 dsl_get_unique(dsl_dataset_t *ds) 2141 { 2142 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2143 } 2144 2145 uint64_t 2146 dsl_get_objsetid(dsl_dataset_t *ds) 2147 { 2148 return (ds->ds_object); 2149 } 2150 2151 uint64_t 2152 dsl_get_userrefs(dsl_dataset_t *ds) 2153 { 2154 return (ds->ds_userrefs); 2155 } 2156 2157 uint64_t 2158 dsl_get_defer_destroy(dsl_dataset_t *ds) 2159 { 2160 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2161 } 2162 2163 uint64_t 2164 dsl_get_referenced(dsl_dataset_t *ds) 2165 { 2166 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2167 } 2168 2169 uint64_t 2170 dsl_get_numclones(dsl_dataset_t *ds) 2171 { 2172 ASSERT(ds->ds_is_snapshot); 2173 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2174 } 2175 2176 uint64_t 2177 dsl_get_inconsistent(dsl_dataset_t *ds) 2178 { 2179 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2180 1 : 0); 2181 } 2182 2183 uint64_t 2184 dsl_get_available(dsl_dataset_t *ds) 2185 { 2186 uint64_t refdbytes = dsl_get_referenced(ds); 2187 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2188 NULL, 0, TRUE); 2189 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2190 availbytes += 2191 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2192 } 2193 if (ds->ds_quota != 0) { 2194 /* 2195 * Adjust available bytes according to refquota 2196 */ 2197 if (refdbytes < ds->ds_quota) { 2198 availbytes = MIN(availbytes, 2199 ds->ds_quota - refdbytes); 2200 } else { 2201 availbytes = 0; 2202 } 2203 } 2204 return (availbytes); 2205 } 2206 2207 int 2208 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2209 { 2210 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2211 dsl_dataset_t *prev; 2212 int err = dsl_dataset_hold_obj(dp, 2213 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2214 if (err == 0) { 2215 uint64_t comp, uncomp; 2216 err = dsl_dataset_space_written(prev, ds, written, 2217 &comp, &uncomp); 2218 dsl_dataset_rele(prev, FTAG); 2219 } 2220 return (err); 2221 } 2222 2223 /* 2224 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2225 */ 2226 int 2227 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2228 { 2229 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2230 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2231 dsl_dataset_name(ds->ds_prev, snap); 2232 return (0); 2233 } else { 2234 return (ENOENT); 2235 } 2236 } 2237 2238 /* 2239 * Returns the mountpoint property and source for the given dataset in the value 2240 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2241 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2242 * Returns 0 on success and an error on failure. 2243 */ 2244 int 2245 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2246 char *source) 2247 { 2248 int error; 2249 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2250 2251 /* Retrieve the mountpoint value stored in the zap opbject */ 2252 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2253 ZAP_MAXVALUELEN, value, source); 2254 if (error != 0) { 2255 return (error); 2256 } 2257 2258 /* 2259 * Process the dsname and source to find the full mountpoint string. 2260 * Can be skipped for 'legacy' or 'none'. 2261 */ 2262 if (value[0] == '/') { 2263 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2264 char *root = buf; 2265 const char *relpath; 2266 2267 /* 2268 * If we inherit the mountpoint, even from a dataset 2269 * with a received value, the source will be the path of 2270 * the dataset we inherit from. If source is 2271 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2272 * inherited. 2273 */ 2274 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2275 relpath = ""; 2276 } else { 2277 ASSERT0(strncmp(dsname, source, strlen(source))); 2278 relpath = dsname + strlen(source); 2279 if (relpath[0] == '/') 2280 relpath++; 2281 } 2282 2283 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2284 2285 /* 2286 * Special case an alternate root of '/'. This will 2287 * avoid having multiple leading slashes in the 2288 * mountpoint path. 2289 */ 2290 if (strcmp(root, "/") == 0) 2291 root++; 2292 2293 /* 2294 * If the mountpoint is '/' then skip over this 2295 * if we are obtaining either an alternate root or 2296 * an inherited mountpoint. 2297 */ 2298 char *mnt = value; 2299 if (value[1] == '\0' && (root[0] != '\0' || 2300 relpath[0] != '\0')) 2301 mnt = value + 1; 2302 2303 if (relpath[0] == '\0') { 2304 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2305 root, mnt); 2306 } else { 2307 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2308 root, mnt, relpath[0] == '@' ? "" : "/", 2309 relpath); 2310 } 2311 kmem_free(buf, ZAP_MAXVALUELEN); 2312 } 2313 2314 return (0); 2315 } 2316 2317 void 2318 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2319 { 2320 int err; 2321 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2322 2323 ASSERT(dsl_pool_config_held(dp)); 2324 2325 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2326 dsl_get_refratio(ds)); 2327 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2328 dsl_get_logicalreferenced(ds)); 2329 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2330 dsl_get_compressratio(ds)); 2331 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2332 dsl_get_used(ds)); 2333 2334 if (ds->ds_is_snapshot) { 2335 get_clones_stat(ds, nv); 2336 } else { 2337 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2338 if (dsl_get_prev_snap(ds, buf) == 0) 2339 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2340 buf); 2341 dsl_dir_stats(ds->ds_dir, nv); 2342 } 2343 2344 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2345 dsl_get_available(ds)); 2346 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2347 dsl_get_referenced(ds)); 2348 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2349 dsl_get_creation(ds)); 2350 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2351 dsl_get_creationtxg(ds)); 2352 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2353 dsl_get_refquota(ds)); 2354 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2355 dsl_get_refreservation(ds)); 2356 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2357 dsl_get_guid(ds)); 2358 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2359 dsl_get_unique(ds)); 2360 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2361 dsl_get_objsetid(ds)); 2362 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2363 dsl_get_userrefs(ds)); 2364 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2365 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2366 dsl_dataset_crypt_stats(ds, nv); 2367 2368 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2369 uint64_t written, comp, uncomp; 2370 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2371 dsl_dataset_t *prev; 2372 2373 err = dsl_dataset_hold_obj(dp, 2374 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2375 if (err == 0) { 2376 err = dsl_dataset_space_written(prev, ds, &written, 2377 &comp, &uncomp); 2378 dsl_dataset_rele(prev, FTAG); 2379 if (err == 0) { 2380 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2381 written); 2382 } 2383 } 2384 } 2385 2386 if (!dsl_dataset_is_snapshot(ds)) { 2387 /* 2388 * A failed "newfs" (e.g. full) resumable receive leaves 2389 * the stats set on this dataset. Check here for the prop. 2390 */ 2391 get_receive_resume_stats(ds, nv); 2392 2393 /* 2394 * A failed incremental resumable receive leaves the 2395 * stats set on our child named "%recv". Check the child 2396 * for the prop. 2397 */ 2398 /* 6 extra bytes for /%recv */ 2399 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 2400 dsl_dataset_t *recv_ds; 2401 dsl_dataset_name(ds, recvname); 2402 if (strlcat(recvname, "/", sizeof (recvname)) < 2403 sizeof (recvname) && 2404 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2405 sizeof (recvname) && 2406 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 2407 get_receive_resume_stats(recv_ds, nv); 2408 dsl_dataset_rele(recv_ds, FTAG); 2409 } 2410 } 2411 } 2412 2413 void 2414 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2415 { 2416 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2417 ASSERT(dsl_pool_config_held(dp)); 2418 2419 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2420 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2421 stat->dds_guid = dsl_get_guid(ds); 2422 stat->dds_origin[0] = '\0'; 2423 if (ds->ds_is_snapshot) { 2424 stat->dds_is_snapshot = B_TRUE; 2425 stat->dds_num_clones = dsl_get_numclones(ds); 2426 } else { 2427 stat->dds_is_snapshot = B_FALSE; 2428 stat->dds_num_clones = 0; 2429 2430 if (dsl_dir_is_clone(ds->ds_dir)) { 2431 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2432 } 2433 } 2434 } 2435 2436 uint64_t 2437 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2438 { 2439 return (ds->ds_fsid_guid); 2440 } 2441 2442 void 2443 dsl_dataset_space(dsl_dataset_t *ds, 2444 uint64_t *refdbytesp, uint64_t *availbytesp, 2445 uint64_t *usedobjsp, uint64_t *availobjsp) 2446 { 2447 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2448 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2449 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2450 *availbytesp += 2451 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2452 if (ds->ds_quota != 0) { 2453 /* 2454 * Adjust available bytes according to refquota 2455 */ 2456 if (*refdbytesp < ds->ds_quota) 2457 *availbytesp = MIN(*availbytesp, 2458 ds->ds_quota - *refdbytesp); 2459 else 2460 *availbytesp = 0; 2461 } 2462 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2463 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2464 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2465 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2466 } 2467 2468 boolean_t 2469 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2470 { 2471 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2472 uint64_t birth; 2473 2474 ASSERT(dsl_pool_config_held(dp)); 2475 if (snap == NULL) 2476 return (B_FALSE); 2477 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2478 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2479 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2480 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2481 objset_t *os, *os_snap; 2482 /* 2483 * It may be that only the ZIL differs, because it was 2484 * reset in the head. Don't count that as being 2485 * modified. 2486 */ 2487 if (dmu_objset_from_ds(ds, &os) != 0) 2488 return (B_TRUE); 2489 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2490 return (B_TRUE); 2491 return (bcmp(&os->os_phys->os_meta_dnode, 2492 &os_snap->os_phys->os_meta_dnode, 2493 sizeof (os->os_phys->os_meta_dnode)) != 0); 2494 } 2495 return (B_FALSE); 2496 } 2497 2498 typedef struct dsl_dataset_rename_snapshot_arg { 2499 const char *ddrsa_fsname; 2500 const char *ddrsa_oldsnapname; 2501 const char *ddrsa_newsnapname; 2502 boolean_t ddrsa_recursive; 2503 dmu_tx_t *ddrsa_tx; 2504 } dsl_dataset_rename_snapshot_arg_t; 2505 2506 /* ARGSUSED */ 2507 static int 2508 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2509 dsl_dataset_t *hds, void *arg) 2510 { 2511 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2512 int error; 2513 uint64_t val; 2514 2515 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2516 if (error != 0) { 2517 /* ignore nonexistent snapshots */ 2518 return (error == ENOENT ? 0 : error); 2519 } 2520 2521 /* new name should not exist */ 2522 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2523 if (error == 0) 2524 error = SET_ERROR(EEXIST); 2525 else if (error == ENOENT) 2526 error = 0; 2527 2528 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2529 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2530 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2531 error = SET_ERROR(ENAMETOOLONG); 2532 2533 return (error); 2534 } 2535 2536 static int 2537 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2538 { 2539 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2540 dsl_pool_t *dp = dmu_tx_pool(tx); 2541 dsl_dataset_t *hds; 2542 int error; 2543 2544 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2545 if (error != 0) 2546 return (error); 2547 2548 if (ddrsa->ddrsa_recursive) { 2549 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2550 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2551 DS_FIND_CHILDREN); 2552 } else { 2553 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2554 } 2555 dsl_dataset_rele(hds, FTAG); 2556 return (error); 2557 } 2558 2559 static int 2560 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2561 dsl_dataset_t *hds, void *arg) 2562 { 2563 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2564 dsl_dataset_t *ds; 2565 uint64_t val; 2566 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2567 int error; 2568 2569 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2570 ASSERT(error == 0 || error == ENOENT); 2571 if (error == ENOENT) { 2572 /* ignore nonexistent snapshots */ 2573 return (0); 2574 } 2575 2576 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2577 2578 /* log before we change the name */ 2579 spa_history_log_internal_ds(ds, "rename", tx, 2580 "-> @%s", ddrsa->ddrsa_newsnapname); 2581 2582 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2583 B_FALSE)); 2584 mutex_enter(&ds->ds_lock); 2585 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2586 mutex_exit(&ds->ds_lock); 2587 VERIFY0(zap_add(dp->dp_meta_objset, 2588 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2589 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2590 2591 dsl_dataset_rele(ds, FTAG); 2592 return (0); 2593 } 2594 2595 static void 2596 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2597 { 2598 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2599 dsl_pool_t *dp = dmu_tx_pool(tx); 2600 dsl_dataset_t *hds; 2601 2602 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2603 ddrsa->ddrsa_tx = tx; 2604 if (ddrsa->ddrsa_recursive) { 2605 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2606 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2607 DS_FIND_CHILDREN)); 2608 } else { 2609 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2610 } 2611 dsl_dataset_rele(hds, FTAG); 2612 } 2613 2614 int 2615 dsl_dataset_rename_snapshot(const char *fsname, 2616 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2617 { 2618 dsl_dataset_rename_snapshot_arg_t ddrsa; 2619 2620 ddrsa.ddrsa_fsname = fsname; 2621 ddrsa.ddrsa_oldsnapname = oldsnapname; 2622 ddrsa.ddrsa_newsnapname = newsnapname; 2623 ddrsa.ddrsa_recursive = recursive; 2624 2625 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2626 dsl_dataset_rename_snapshot_sync, &ddrsa, 2627 1, ZFS_SPACE_CHECK_RESERVED)); 2628 } 2629 2630 /* 2631 * If we're doing an ownership handoff, we need to make sure that there is 2632 * only one long hold on the dataset. We're not allowed to change anything here 2633 * so we don't permanently release the long hold or regular hold here. We want 2634 * to do this only when syncing to avoid the dataset unexpectedly going away 2635 * when we release the long hold. 2636 */ 2637 static int 2638 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2639 { 2640 boolean_t held; 2641 2642 if (!dmu_tx_is_syncing(tx)) 2643 return (0); 2644 2645 if (owner != NULL) { 2646 VERIFY3P(ds->ds_owner, ==, owner); 2647 dsl_dataset_long_rele(ds, owner); 2648 } 2649 2650 held = dsl_dataset_long_held(ds); 2651 2652 if (owner != NULL) 2653 dsl_dataset_long_hold(ds, owner); 2654 2655 if (held) 2656 return (SET_ERROR(EBUSY)); 2657 2658 return (0); 2659 } 2660 2661 int 2662 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2663 { 2664 dsl_dataset_rollback_arg_t *ddra = arg; 2665 dsl_pool_t *dp = dmu_tx_pool(tx); 2666 dsl_dataset_t *ds; 2667 int64_t unused_refres_delta; 2668 int error; 2669 2670 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2671 if (error != 0) 2672 return (error); 2673 2674 /* must not be a snapshot */ 2675 if (ds->ds_is_snapshot) { 2676 dsl_dataset_rele(ds, FTAG); 2677 return (SET_ERROR(EINVAL)); 2678 } 2679 2680 /* must have a most recent snapshot */ 2681 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2682 dsl_dataset_rele(ds, FTAG); 2683 return (SET_ERROR(ESRCH)); 2684 } 2685 2686 /* 2687 * No rollback to a snapshot created in the current txg, because 2688 * the rollback may dirty the dataset and create blocks that are 2689 * not reachable from the rootbp while having a birth txg that 2690 * falls into the snapshot's range. 2691 */ 2692 if (dmu_tx_is_syncing(tx) && 2693 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 2694 dsl_dataset_rele(ds, FTAG); 2695 return (SET_ERROR(EAGAIN)); 2696 } 2697 2698 /* 2699 * If the expected target snapshot is specified, then check that 2700 * the latest snapshot is it. 2701 */ 2702 if (ddra->ddra_tosnap != NULL) { 2703 dsl_dataset_t *snapds; 2704 2705 /* Check if the target snapshot exists at all. */ 2706 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 2707 if (error != 0) { 2708 /* 2709 * ESRCH is used to signal that the target snapshot does 2710 * not exist, while ENOENT is used to report that 2711 * the rolled back dataset does not exist. 2712 * ESRCH is also used to cover other cases where the 2713 * target snapshot is not related to the dataset being 2714 * rolled back such as being in a different pool. 2715 */ 2716 if (error == ENOENT || error == EXDEV) 2717 error = SET_ERROR(ESRCH); 2718 dsl_dataset_rele(ds, FTAG); 2719 return (error); 2720 } 2721 ASSERT(snapds->ds_is_snapshot); 2722 2723 /* Check if the snapshot is the latest snapshot indeed. */ 2724 if (snapds != ds->ds_prev) { 2725 /* 2726 * Distinguish between the case where the only problem 2727 * is intervening snapshots (EEXIST) vs the snapshot 2728 * not being a valid target for rollback (ESRCH). 2729 */ 2730 if (snapds->ds_dir == ds->ds_dir || 2731 (dsl_dir_is_clone(ds->ds_dir) && 2732 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 2733 snapds->ds_object)) { 2734 error = SET_ERROR(EEXIST); 2735 } else { 2736 error = SET_ERROR(ESRCH); 2737 } 2738 dsl_dataset_rele(snapds, FTAG); 2739 dsl_dataset_rele(ds, FTAG); 2740 return (error); 2741 } 2742 dsl_dataset_rele(snapds, FTAG); 2743 } 2744 2745 /* must not have any bookmarks after the most recent snapshot */ 2746 nvlist_t *proprequest = fnvlist_alloc(); 2747 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2748 nvlist_t *bookmarks = fnvlist_alloc(); 2749 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2750 fnvlist_free(proprequest); 2751 if (error != 0) { 2752 dsl_dataset_rele(ds, FTAG); 2753 return (error); 2754 } 2755 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2756 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2757 nvlist_t *valuenv = 2758 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2759 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2760 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2761 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2762 fnvlist_free(bookmarks); 2763 dsl_dataset_rele(ds, FTAG); 2764 return (SET_ERROR(EEXIST)); 2765 } 2766 } 2767 fnvlist_free(bookmarks); 2768 2769 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2770 if (error != 0) { 2771 dsl_dataset_rele(ds, FTAG); 2772 return (error); 2773 } 2774 2775 /* 2776 * Check if the snap we are rolling back to uses more than 2777 * the refquota. 2778 */ 2779 if (ds->ds_quota != 0 && 2780 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2781 dsl_dataset_rele(ds, FTAG); 2782 return (SET_ERROR(EDQUOT)); 2783 } 2784 2785 /* 2786 * When we do the clone swap, we will temporarily use more space 2787 * due to the refreservation (the head will no longer have any 2788 * unique space, so the entire amount of the refreservation will need 2789 * to be free). We will immediately destroy the clone, freeing 2790 * this space, but the freeing happens over many txg's. 2791 */ 2792 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2793 dsl_dataset_phys(ds)->ds_unique_bytes); 2794 2795 if (unused_refres_delta > 0 && 2796 unused_refres_delta > 2797 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2798 dsl_dataset_rele(ds, FTAG); 2799 return (SET_ERROR(ENOSPC)); 2800 } 2801 2802 dsl_dataset_rele(ds, FTAG); 2803 return (0); 2804 } 2805 2806 void 2807 dsl_dataset_rollback_sync(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, *clone; 2812 uint64_t cloneobj; 2813 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2814 2815 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2816 2817 dsl_dataset_name(ds->ds_prev, namebuf); 2818 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2819 2820 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2821 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, NULL, tx); 2822 2823 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2824 2825 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2826 dsl_dataset_zero_zil(ds, tx); 2827 2828 dsl_destroy_head_sync_impl(clone, tx); 2829 2830 dsl_dataset_rele(clone, FTAG); 2831 dsl_dataset_rele(ds, FTAG); 2832 } 2833 2834 /* 2835 * Rolls back the given filesystem or volume to the most recent snapshot. 2836 * The name of the most recent snapshot will be returned under key "target" 2837 * in the result nvlist. 2838 * 2839 * If owner != NULL: 2840 * - The existing dataset MUST be owned by the specified owner at entry 2841 * - Upon return, dataset will still be held by the same owner, whether we 2842 * succeed or not. 2843 * 2844 * This mode is required any time the existing filesystem is mounted. See 2845 * notes above zfs_suspend_fs() for further details. 2846 */ 2847 int 2848 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 2849 nvlist_t *result) 2850 { 2851 dsl_dataset_rollback_arg_t ddra; 2852 2853 ddra.ddra_fsname = fsname; 2854 ddra.ddra_tosnap = tosnap; 2855 ddra.ddra_owner = owner; 2856 ddra.ddra_result = result; 2857 2858 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2859 dsl_dataset_rollback_sync, &ddra, 2860 1, ZFS_SPACE_CHECK_RESERVED)); 2861 } 2862 2863 struct promotenode { 2864 list_node_t link; 2865 dsl_dataset_t *ds; 2866 }; 2867 2868 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2869 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2870 void *tag); 2871 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2872 2873 int 2874 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2875 { 2876 dsl_dataset_promote_arg_t *ddpa = arg; 2877 dsl_pool_t *dp = dmu_tx_pool(tx); 2878 dsl_dataset_t *hds; 2879 struct promotenode *snap; 2880 dsl_dataset_t *origin_ds; 2881 int err; 2882 uint64_t unused; 2883 uint64_t ss_mv_cnt; 2884 size_t max_snap_len; 2885 boolean_t conflicting_snaps; 2886 2887 err = promote_hold(ddpa, dp, FTAG); 2888 if (err != 0) 2889 return (err); 2890 2891 hds = ddpa->ddpa_clone; 2892 snap = list_head(&ddpa->shared_snaps); 2893 origin_ds = snap->ds; 2894 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2895 2896 snap = list_head(&ddpa->origin_snaps); 2897 2898 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2899 promote_rele(ddpa, FTAG); 2900 return (SET_ERROR(EXDEV)); 2901 } 2902 2903 snap = list_head(&ddpa->shared_snaps); 2904 if (snap == NULL) { 2905 err = SET_ERROR(ENOENT); 2906 goto out; 2907 } 2908 origin_ds = snap->ds; 2909 2910 /* 2911 * Encrypted clones share a DSL Crypto Key with their origin's dsl dir. 2912 * When doing a promote we must make sure the encryption root for 2913 * both the target and the target's origin does not change to avoid 2914 * needing to rewrap encryption keys 2915 */ 2916 err = dsl_dataset_promote_crypt_check(hds->ds_dir, origin_ds->ds_dir); 2917 if (err != 0) 2918 goto out; 2919 2920 /* 2921 * Compute and check the amount of space to transfer. Since this is 2922 * so expensive, don't do the preliminary check. 2923 */ 2924 if (!dmu_tx_is_syncing(tx)) { 2925 promote_rele(ddpa, FTAG); 2926 return (0); 2927 } 2928 2929 /* compute origin's new unique space */ 2930 snap = list_tail(&ddpa->clone_snaps); 2931 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2932 origin_ds->ds_object); 2933 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2934 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2935 &ddpa->unique, &unused, &unused); 2936 2937 /* 2938 * Walk the snapshots that we are moving 2939 * 2940 * Compute space to transfer. Consider the incremental changes 2941 * to used by each snapshot: 2942 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2943 * So each snapshot gave birth to: 2944 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2945 * So a sequence would look like: 2946 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2947 * Which simplifies to: 2948 * uN + kN + kN-1 + ... + k1 + k0 2949 * Note however, if we stop before we reach the ORIGIN we get: 2950 * uN + kN + kN-1 + ... + kM - uM-1 2951 */ 2952 conflicting_snaps = B_FALSE; 2953 ss_mv_cnt = 0; 2954 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2955 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2956 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2957 for (snap = list_head(&ddpa->shared_snaps); snap; 2958 snap = list_next(&ddpa->shared_snaps, snap)) { 2959 uint64_t val, dlused, dlcomp, dluncomp; 2960 dsl_dataset_t *ds = snap->ds; 2961 2962 ss_mv_cnt++; 2963 2964 /* 2965 * If there are long holds, we won't be able to evict 2966 * the objset. 2967 */ 2968 if (dsl_dataset_long_held(ds)) { 2969 err = SET_ERROR(EBUSY); 2970 goto out; 2971 } 2972 2973 /* Check that the snapshot name does not conflict */ 2974 VERIFY0(dsl_dataset_get_snapname(ds)); 2975 if (strlen(ds->ds_snapname) >= max_snap_len) { 2976 err = SET_ERROR(ENAMETOOLONG); 2977 goto out; 2978 } 2979 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2980 if (err == 0) { 2981 fnvlist_add_boolean(ddpa->err_ds, 2982 snap->ds->ds_snapname); 2983 conflicting_snaps = B_TRUE; 2984 } else if (err != ENOENT) { 2985 goto out; 2986 } 2987 2988 /* The very first snapshot does not have a deadlist */ 2989 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2990 continue; 2991 2992 dsl_deadlist_space(&ds->ds_deadlist, 2993 &dlused, &dlcomp, &dluncomp); 2994 ddpa->used += dlused; 2995 ddpa->comp += dlcomp; 2996 ddpa->uncomp += dluncomp; 2997 } 2998 2999 /* 3000 * In order to return the full list of conflicting snapshots, we check 3001 * whether there was a conflict after traversing all of them. 3002 */ 3003 if (conflicting_snaps) { 3004 err = SET_ERROR(EEXIST); 3005 goto out; 3006 } 3007 3008 /* 3009 * If we are a clone of a clone then we never reached ORIGIN, 3010 * so we need to subtract out the clone origin's used space. 3011 */ 3012 if (ddpa->origin_origin) { 3013 ddpa->used -= 3014 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 3015 ddpa->comp -= 3016 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 3017 ddpa->uncomp -= 3018 dsl_dataset_phys(ddpa->origin_origin)-> 3019 ds_uncompressed_bytes; 3020 } 3021 3022 /* Check that there is enough space and limit headroom here */ 3023 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 3024 0, ss_mv_cnt, ddpa->used, ddpa->cr); 3025 if (err != 0) 3026 goto out; 3027 3028 /* 3029 * Compute the amounts of space that will be used by snapshots 3030 * after the promotion (for both origin and clone). For each, 3031 * it is the amount of space that will be on all of their 3032 * deadlists (that was not born before their new origin). 3033 */ 3034 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 3035 uint64_t space; 3036 3037 /* 3038 * Note, typically this will not be a clone of a clone, 3039 * so dd_origin_txg will be < TXG_INITIAL, so 3040 * these snaplist_space() -> dsl_deadlist_space_range() 3041 * calls will be fast because they do not have to 3042 * iterate over all bps. 3043 */ 3044 snap = list_head(&ddpa->origin_snaps); 3045 err = snaplist_space(&ddpa->shared_snaps, 3046 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 3047 if (err != 0) 3048 goto out; 3049 3050 err = snaplist_space(&ddpa->clone_snaps, 3051 snap->ds->ds_dir->dd_origin_txg, &space); 3052 if (err != 0) 3053 goto out; 3054 ddpa->cloneusedsnap += space; 3055 } 3056 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 3057 DD_FLAG_USED_BREAKDOWN) { 3058 err = snaplist_space(&ddpa->origin_snaps, 3059 dsl_dataset_phys(origin_ds)->ds_creation_txg, 3060 &ddpa->originusedsnap); 3061 if (err != 0) 3062 goto out; 3063 } 3064 3065 out: 3066 promote_rele(ddpa, FTAG); 3067 return (err); 3068 } 3069 3070 void 3071 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 3072 { 3073 dsl_dataset_promote_arg_t *ddpa = arg; 3074 dsl_pool_t *dp = dmu_tx_pool(tx); 3075 dsl_dataset_t *hds; 3076 struct promotenode *snap; 3077 dsl_dataset_t *origin_ds; 3078 dsl_dataset_t *origin_head; 3079 dsl_dir_t *dd; 3080 dsl_dir_t *odd = NULL; 3081 uint64_t oldnext_obj; 3082 int64_t delta; 3083 3084 VERIFY0(promote_hold(ddpa, dp, FTAG)); 3085 hds = ddpa->ddpa_clone; 3086 3087 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 3088 3089 snap = list_head(&ddpa->shared_snaps); 3090 origin_ds = snap->ds; 3091 dd = hds->ds_dir; 3092 3093 snap = list_head(&ddpa->origin_snaps); 3094 origin_head = snap->ds; 3095 3096 /* 3097 * We need to explicitly open odd, since origin_ds's dd will be 3098 * changing. 3099 */ 3100 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 3101 NULL, FTAG, &odd)); 3102 3103 dsl_dataset_promote_crypt_sync(hds->ds_dir, odd, tx); 3104 3105 /* change origin's next snap */ 3106 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 3107 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 3108 snap = list_tail(&ddpa->clone_snaps); 3109 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 3110 origin_ds->ds_object); 3111 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 3112 3113 /* change the origin's next clone */ 3114 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 3115 dsl_dataset_remove_from_next_clones(origin_ds, 3116 snap->ds->ds_object, tx); 3117 VERIFY0(zap_add_int(dp->dp_meta_objset, 3118 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 3119 oldnext_obj, tx)); 3120 } 3121 3122 /* change origin */ 3123 dmu_buf_will_dirty(dd->dd_dbuf, tx); 3124 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 3125 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 3126 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 3127 dmu_buf_will_dirty(odd->dd_dbuf, tx); 3128 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 3129 origin_head->ds_dir->dd_origin_txg = 3130 dsl_dataset_phys(origin_ds)->ds_creation_txg; 3131 3132 /* change dd_clone entries */ 3133 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3134 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3135 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 3136 VERIFY0(zap_add_int(dp->dp_meta_objset, 3137 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3138 hds->ds_object, tx)); 3139 3140 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3141 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 3142 origin_head->ds_object, tx)); 3143 if (dsl_dir_phys(dd)->dd_clones == 0) { 3144 dsl_dir_phys(dd)->dd_clones = 3145 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 3146 DMU_OT_NONE, 0, tx); 3147 } 3148 VERIFY0(zap_add_int(dp->dp_meta_objset, 3149 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 3150 } 3151 3152 /* move snapshots to this dir */ 3153 for (snap = list_head(&ddpa->shared_snaps); snap; 3154 snap = list_next(&ddpa->shared_snaps, snap)) { 3155 dsl_dataset_t *ds = snap->ds; 3156 3157 /* 3158 * Property callbacks are registered to a particular 3159 * dsl_dir. Since ours is changing, evict the objset 3160 * so that they will be unregistered from the old dsl_dir. 3161 */ 3162 if (ds->ds_objset) { 3163 dmu_objset_evict(ds->ds_objset); 3164 ds->ds_objset = NULL; 3165 } 3166 3167 /* move snap name entry */ 3168 VERIFY0(dsl_dataset_get_snapname(ds)); 3169 VERIFY0(dsl_dataset_snap_remove(origin_head, 3170 ds->ds_snapname, tx, B_TRUE)); 3171 VERIFY0(zap_add(dp->dp_meta_objset, 3172 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3173 8, 1, &ds->ds_object, tx)); 3174 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3175 DD_FIELD_SNAPSHOT_COUNT, tx); 3176 3177 /* change containing dsl_dir */ 3178 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3179 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3180 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3181 ASSERT3P(ds->ds_dir, ==, odd); 3182 dsl_dir_rele(ds->ds_dir, ds); 3183 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3184 NULL, ds, &ds->ds_dir)); 3185 3186 /* move any clone references */ 3187 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3188 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3189 zap_cursor_t zc; 3190 zap_attribute_t za; 3191 3192 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3193 dsl_dataset_phys(ds)->ds_next_clones_obj); 3194 zap_cursor_retrieve(&zc, &za) == 0; 3195 zap_cursor_advance(&zc)) { 3196 dsl_dataset_t *cnds; 3197 uint64_t o; 3198 3199 if (za.za_first_integer == oldnext_obj) { 3200 /* 3201 * We've already moved the 3202 * origin's reference. 3203 */ 3204 continue; 3205 } 3206 3207 VERIFY0(dsl_dataset_hold_obj(dp, 3208 za.za_first_integer, FTAG, &cnds)); 3209 o = dsl_dir_phys(cnds->ds_dir)-> 3210 dd_head_dataset_obj; 3211 3212 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3213 dsl_dir_phys(odd)->dd_clones, o, tx)); 3214 VERIFY0(zap_add_int(dp->dp_meta_objset, 3215 dsl_dir_phys(dd)->dd_clones, o, tx)); 3216 dsl_dataset_rele(cnds, FTAG); 3217 } 3218 zap_cursor_fini(&zc); 3219 } 3220 3221 ASSERT(!dsl_prop_hascb(ds)); 3222 } 3223 3224 /* 3225 * Change space accounting. 3226 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3227 * both be valid, or both be 0 (resulting in delta == 0). This 3228 * is true for each of {clone,origin} independently. 3229 */ 3230 3231 delta = ddpa->cloneusedsnap - 3232 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3233 ASSERT3S(delta, >=, 0); 3234 ASSERT3U(ddpa->used, >=, delta); 3235 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3236 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3237 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3238 3239 delta = ddpa->originusedsnap - 3240 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3241 ASSERT3S(delta, <=, 0); 3242 ASSERT3U(ddpa->used, >=, -delta); 3243 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3244 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3245 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3246 3247 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3248 3249 /* log history record */ 3250 spa_history_log_internal_ds(hds, "promote", tx, ""); 3251 3252 dsl_dir_rele(odd, FTAG); 3253 promote_rele(ddpa, FTAG); 3254 } 3255 3256 /* 3257 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3258 * (exclusive) and last_obj (inclusive). The list will be in reverse 3259 * order (last_obj will be the list_head()). If first_obj == 0, do all 3260 * snapshots back to this dataset's origin. 3261 */ 3262 static int 3263 snaplist_make(dsl_pool_t *dp, 3264 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 3265 { 3266 uint64_t obj = last_obj; 3267 3268 list_create(l, sizeof (struct promotenode), 3269 offsetof(struct promotenode, link)); 3270 3271 while (obj != first_obj) { 3272 dsl_dataset_t *ds; 3273 struct promotenode *snap; 3274 int err; 3275 3276 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3277 ASSERT(err != ENOENT); 3278 if (err != 0) 3279 return (err); 3280 3281 if (first_obj == 0) 3282 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3283 3284 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3285 snap->ds = ds; 3286 list_insert_tail(l, snap); 3287 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3288 } 3289 3290 return (0); 3291 } 3292 3293 static int 3294 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3295 { 3296 struct promotenode *snap; 3297 3298 *spacep = 0; 3299 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3300 uint64_t used, comp, uncomp; 3301 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3302 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3303 *spacep += used; 3304 } 3305 return (0); 3306 } 3307 3308 static void 3309 snaplist_destroy(list_t *l, void *tag) 3310 { 3311 struct promotenode *snap; 3312 3313 if (l == NULL || !list_link_active(&l->list_head)) 3314 return; 3315 3316 while ((snap = list_tail(l)) != NULL) { 3317 list_remove(l, snap); 3318 dsl_dataset_rele(snap->ds, tag); 3319 kmem_free(snap, sizeof (*snap)); 3320 } 3321 list_destroy(l); 3322 } 3323 3324 static int 3325 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 3326 { 3327 int error; 3328 dsl_dir_t *dd; 3329 struct promotenode *snap; 3330 3331 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3332 &ddpa->ddpa_clone); 3333 if (error != 0) 3334 return (error); 3335 dd = ddpa->ddpa_clone->ds_dir; 3336 3337 if (ddpa->ddpa_clone->ds_is_snapshot || 3338 !dsl_dir_is_clone(dd)) { 3339 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3340 return (SET_ERROR(EINVAL)); 3341 } 3342 3343 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3344 &ddpa->shared_snaps, tag); 3345 if (error != 0) 3346 goto out; 3347 3348 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3349 &ddpa->clone_snaps, tag); 3350 if (error != 0) 3351 goto out; 3352 3353 snap = list_head(&ddpa->shared_snaps); 3354 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3355 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3356 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3357 &ddpa->origin_snaps, tag); 3358 if (error != 0) 3359 goto out; 3360 3361 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3362 error = dsl_dataset_hold_obj(dp, 3363 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3364 tag, &ddpa->origin_origin); 3365 if (error != 0) 3366 goto out; 3367 } 3368 out: 3369 if (error != 0) 3370 promote_rele(ddpa, tag); 3371 return (error); 3372 } 3373 3374 static void 3375 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 3376 { 3377 snaplist_destroy(&ddpa->shared_snaps, tag); 3378 snaplist_destroy(&ddpa->clone_snaps, tag); 3379 snaplist_destroy(&ddpa->origin_snaps, tag); 3380 if (ddpa->origin_origin != NULL) 3381 dsl_dataset_rele(ddpa->origin_origin, tag); 3382 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3383 } 3384 3385 /* 3386 * Promote a clone. 3387 * 3388 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3389 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3390 */ 3391 int 3392 dsl_dataset_promote(const char *name, char *conflsnap) 3393 { 3394 dsl_dataset_promote_arg_t ddpa = { 0 }; 3395 uint64_t numsnaps; 3396 int error; 3397 nvpair_t *snap_pair; 3398 objset_t *os; 3399 3400 /* 3401 * We will modify space proportional to the number of 3402 * snapshots. Compute numsnaps. 3403 */ 3404 error = dmu_objset_hold(name, FTAG, &os); 3405 if (error != 0) 3406 return (error); 3407 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3408 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3409 &numsnaps); 3410 dmu_objset_rele(os, FTAG); 3411 if (error != 0) 3412 return (error); 3413 3414 ddpa.ddpa_clonename = name; 3415 ddpa.err_ds = fnvlist_alloc(); 3416 ddpa.cr = CRED(); 3417 3418 error = dsl_sync_task(name, dsl_dataset_promote_check, 3419 dsl_dataset_promote_sync, &ddpa, 3420 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3421 3422 /* 3423 * Return the first conflicting snapshot found. 3424 */ 3425 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3426 if (snap_pair != NULL && conflsnap != NULL) 3427 (void) strcpy(conflsnap, nvpair_name(snap_pair)); 3428 3429 fnvlist_free(ddpa.err_ds); 3430 return (error); 3431 } 3432 3433 int 3434 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3435 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3436 { 3437 /* 3438 * "slack" factor for received datasets with refquota set on them. 3439 * See the bottom of this function for details on its use. 3440 */ 3441 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 3442 int64_t unused_refres_delta; 3443 3444 /* they should both be heads */ 3445 if (clone->ds_is_snapshot || 3446 origin_head->ds_is_snapshot) 3447 return (SET_ERROR(EINVAL)); 3448 3449 /* if we are not forcing, the branch point should be just before them */ 3450 if (!force && clone->ds_prev != origin_head->ds_prev) 3451 return (SET_ERROR(EINVAL)); 3452 3453 /* clone should be the clone (unless they are unrelated) */ 3454 if (clone->ds_prev != NULL && 3455 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3456 origin_head->ds_dir != clone->ds_prev->ds_dir) 3457 return (SET_ERROR(EINVAL)); 3458 3459 /* the clone should be a child of the origin */ 3460 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3461 return (SET_ERROR(EINVAL)); 3462 3463 /* origin_head shouldn't be modified unless 'force' */ 3464 if (!force && 3465 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3466 return (SET_ERROR(ETXTBSY)); 3467 3468 /* origin_head should have no long holds (e.g. is not mounted) */ 3469 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3470 return (SET_ERROR(EBUSY)); 3471 3472 /* check amount of any unconsumed refreservation */ 3473 unused_refres_delta = 3474 (int64_t)MIN(origin_head->ds_reserved, 3475 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3476 (int64_t)MIN(origin_head->ds_reserved, 3477 dsl_dataset_phys(clone)->ds_unique_bytes); 3478 3479 if (unused_refres_delta > 0 && 3480 unused_refres_delta > 3481 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3482 return (SET_ERROR(ENOSPC)); 3483 3484 /* 3485 * The clone can't be too much over the head's refquota. 3486 * 3487 * To ensure that the entire refquota can be used, we allow one 3488 * transaction to exceed the the refquota. Therefore, this check 3489 * needs to also allow for the space referenced to be more than the 3490 * refquota. The maximum amount of space that one transaction can use 3491 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3492 * overage ensures that we are able to receive a filesystem that 3493 * exceeds the refquota on the source system. 3494 * 3495 * So that overage is the refquota_slack we use below. 3496 */ 3497 if (origin_head->ds_quota != 0 && 3498 dsl_dataset_phys(clone)->ds_referenced_bytes > 3499 origin_head->ds_quota + refquota_slack) 3500 return (SET_ERROR(EDQUOT)); 3501 3502 return (0); 3503 } 3504 3505 static void 3506 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3507 dsl_dataset_t *origin, dmu_tx_t *tx) 3508 { 3509 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 3510 dsl_pool_t *dp = dmu_tx_pool(tx); 3511 3512 ASSERT(dsl_pool_sync_context(dp)); 3513 3514 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 3515 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 3516 3517 if (clone_remap_dl_obj != 0) { 3518 dsl_deadlist_close(&clone->ds_remap_deadlist); 3519 dsl_dataset_unset_remap_deadlist_object(clone, tx); 3520 } 3521 if (origin_remap_dl_obj != 0) { 3522 dsl_deadlist_close(&origin->ds_remap_deadlist); 3523 dsl_dataset_unset_remap_deadlist_object(origin, tx); 3524 } 3525 3526 if (clone_remap_dl_obj != 0) { 3527 dsl_dataset_set_remap_deadlist_object(origin, 3528 clone_remap_dl_obj, tx); 3529 dsl_deadlist_open(&origin->ds_remap_deadlist, 3530 dp->dp_meta_objset, clone_remap_dl_obj); 3531 } 3532 if (origin_remap_dl_obj != 0) { 3533 dsl_dataset_set_remap_deadlist_object(clone, 3534 origin_remap_dl_obj, tx); 3535 dsl_deadlist_open(&clone->ds_remap_deadlist, 3536 dp->dp_meta_objset, origin_remap_dl_obj); 3537 } 3538 } 3539 3540 void 3541 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 3542 dsl_dataset_t *origin_head, dmu_tx_t *tx) 3543 { 3544 dsl_pool_t *dp = dmu_tx_pool(tx); 3545 int64_t unused_refres_delta; 3546 3547 ASSERT(clone->ds_reserved == 0); 3548 /* 3549 * NOTE: On DEBUG kernels there could be a race between this and 3550 * the check function if spa_asize_inflation is adjusted... 3551 */ 3552 ASSERT(origin_head->ds_quota == 0 || 3553 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 3554 DMU_MAX_ACCESS * spa_asize_inflation); 3555 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 3556 3557 /* 3558 * Swap per-dataset feature flags. 3559 */ 3560 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 3561 if (!(spa_feature_table[f].fi_flags & 3562 ZFEATURE_FLAG_PER_DATASET)) { 3563 ASSERT(!clone->ds_feature_inuse[f]); 3564 ASSERT(!origin_head->ds_feature_inuse[f]); 3565 continue; 3566 } 3567 3568 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3569 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3570 3571 if (clone_inuse) { 3572 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3573 clone->ds_feature_inuse[f] = B_FALSE; 3574 } 3575 if (origin_head_inuse) { 3576 dsl_dataset_deactivate_feature(origin_head->ds_object, 3577 f, tx); 3578 origin_head->ds_feature_inuse[f] = B_FALSE; 3579 } 3580 if (clone_inuse) { 3581 dsl_dataset_activate_feature(origin_head->ds_object, 3582 f, tx); 3583 origin_head->ds_feature_inuse[f] = B_TRUE; 3584 } 3585 if (origin_head_inuse) { 3586 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3587 clone->ds_feature_inuse[f] = B_TRUE; 3588 } 3589 } 3590 3591 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3592 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3593 3594 if (clone->ds_objset != NULL) { 3595 dmu_objset_evict(clone->ds_objset); 3596 clone->ds_objset = NULL; 3597 } 3598 3599 if (origin_head->ds_objset != NULL) { 3600 dmu_objset_evict(origin_head->ds_objset); 3601 origin_head->ds_objset = NULL; 3602 } 3603 3604 unused_refres_delta = 3605 (int64_t)MIN(origin_head->ds_reserved, 3606 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3607 (int64_t)MIN(origin_head->ds_reserved, 3608 dsl_dataset_phys(clone)->ds_unique_bytes); 3609 3610 /* 3611 * Reset origin's unique bytes, if it exists. 3612 */ 3613 if (clone->ds_prev) { 3614 dsl_dataset_t *origin = clone->ds_prev; 3615 uint64_t comp, uncomp; 3616 3617 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3618 dsl_deadlist_space_range(&clone->ds_deadlist, 3619 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3620 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3621 } 3622 3623 /* swap blkptrs */ 3624 { 3625 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 3626 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 3627 blkptr_t tmp; 3628 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3629 dsl_dataset_phys(origin_head)->ds_bp = 3630 dsl_dataset_phys(clone)->ds_bp; 3631 dsl_dataset_phys(clone)->ds_bp = tmp; 3632 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 3633 rrw_exit(&clone->ds_bp_rwlock, FTAG); 3634 } 3635 3636 /* set dd_*_bytes */ 3637 { 3638 int64_t dused, dcomp, duncomp; 3639 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3640 uint64_t odl_used, odl_comp, odl_uncomp; 3641 3642 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3643 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3644 3645 dsl_deadlist_space(&clone->ds_deadlist, 3646 &cdl_used, &cdl_comp, &cdl_uncomp); 3647 dsl_deadlist_space(&origin_head->ds_deadlist, 3648 &odl_used, &odl_comp, &odl_uncomp); 3649 3650 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3651 cdl_used - 3652 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3653 odl_used); 3654 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3655 cdl_comp - 3656 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3657 odl_comp); 3658 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3659 cdl_uncomp - 3660 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3661 odl_uncomp); 3662 3663 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3664 dused, dcomp, duncomp, tx); 3665 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3666 -dused, -dcomp, -duncomp, tx); 3667 3668 /* 3669 * The difference in the space used by snapshots is the 3670 * difference in snapshot space due to the head's 3671 * deadlist (since that's the only thing that's 3672 * changing that affects the snapused). 3673 */ 3674 dsl_deadlist_space_range(&clone->ds_deadlist, 3675 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3676 &cdl_used, &cdl_comp, &cdl_uncomp); 3677 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3678 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3679 &odl_used, &odl_comp, &odl_uncomp); 3680 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3681 DD_USED_HEAD, DD_USED_SNAP, tx); 3682 } 3683 3684 /* swap ds_*_bytes */ 3685 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3686 dsl_dataset_phys(clone)->ds_referenced_bytes); 3687 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3688 dsl_dataset_phys(clone)->ds_compressed_bytes); 3689 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3690 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3691 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3692 dsl_dataset_phys(clone)->ds_unique_bytes); 3693 3694 /* apply any parent delta for change in unconsumed refreservation */ 3695 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3696 unused_refres_delta, 0, 0, tx); 3697 3698 /* 3699 * Swap deadlists. 3700 */ 3701 dsl_deadlist_close(&clone->ds_deadlist); 3702 dsl_deadlist_close(&origin_head->ds_deadlist); 3703 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3704 dsl_dataset_phys(clone)->ds_deadlist_obj); 3705 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3706 dsl_dataset_phys(clone)->ds_deadlist_obj); 3707 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3708 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3709 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 3710 3711 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3712 3713 spa_history_log_internal_ds(clone, "clone swap", tx, 3714 "parent=%s", origin_head->ds_dir->dd_myname); 3715 } 3716 3717 /* 3718 * Given a pool name and a dataset object number in that pool, 3719 * return the name of that dataset. 3720 */ 3721 int 3722 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3723 { 3724 dsl_pool_t *dp; 3725 dsl_dataset_t *ds; 3726 int error; 3727 3728 error = dsl_pool_hold(pname, FTAG, &dp); 3729 if (error != 0) 3730 return (error); 3731 3732 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3733 if (error == 0) { 3734 dsl_dataset_name(ds, buf); 3735 dsl_dataset_rele(ds, FTAG); 3736 } 3737 dsl_pool_rele(dp, FTAG); 3738 3739 return (error); 3740 } 3741 3742 int 3743 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3744 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3745 { 3746 int error = 0; 3747 3748 ASSERT3S(asize, >, 0); 3749 3750 /* 3751 * *ref_rsrv is the portion of asize that will come from any 3752 * unconsumed refreservation space. 3753 */ 3754 *ref_rsrv = 0; 3755 3756 mutex_enter(&ds->ds_lock); 3757 /* 3758 * Make a space adjustment for reserved bytes. 3759 */ 3760 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3761 ASSERT3U(*used, >=, 3762 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3763 *used -= 3764 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3765 *ref_rsrv = 3766 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3767 } 3768 3769 if (!check_quota || ds->ds_quota == 0) { 3770 mutex_exit(&ds->ds_lock); 3771 return (0); 3772 } 3773 /* 3774 * If they are requesting more space, and our current estimate 3775 * is over quota, they get to try again unless the actual 3776 * on-disk is over quota and there are no pending changes (which 3777 * may free up space for us). 3778 */ 3779 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3780 ds->ds_quota) { 3781 if (inflight > 0 || 3782 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3783 error = SET_ERROR(ERESTART); 3784 else 3785 error = SET_ERROR(EDQUOT); 3786 } 3787 mutex_exit(&ds->ds_lock); 3788 3789 return (error); 3790 } 3791 3792 typedef struct dsl_dataset_set_qr_arg { 3793 const char *ddsqra_name; 3794 zprop_source_t ddsqra_source; 3795 uint64_t ddsqra_value; 3796 } dsl_dataset_set_qr_arg_t; 3797 3798 3799 /* ARGSUSED */ 3800 static int 3801 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3802 { 3803 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3804 dsl_pool_t *dp = dmu_tx_pool(tx); 3805 dsl_dataset_t *ds; 3806 int error; 3807 uint64_t newval; 3808 3809 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3810 return (SET_ERROR(ENOTSUP)); 3811 3812 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3813 if (error != 0) 3814 return (error); 3815 3816 if (ds->ds_is_snapshot) { 3817 dsl_dataset_rele(ds, FTAG); 3818 return (SET_ERROR(EINVAL)); 3819 } 3820 3821 error = dsl_prop_predict(ds->ds_dir, 3822 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3823 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3824 if (error != 0) { 3825 dsl_dataset_rele(ds, FTAG); 3826 return (error); 3827 } 3828 3829 if (newval == 0) { 3830 dsl_dataset_rele(ds, FTAG); 3831 return (0); 3832 } 3833 3834 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3835 newval < ds->ds_reserved) { 3836 dsl_dataset_rele(ds, FTAG); 3837 return (SET_ERROR(ENOSPC)); 3838 } 3839 3840 dsl_dataset_rele(ds, FTAG); 3841 return (0); 3842 } 3843 3844 static void 3845 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3846 { 3847 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3848 dsl_pool_t *dp = dmu_tx_pool(tx); 3849 dsl_dataset_t *ds; 3850 uint64_t newval; 3851 3852 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3853 3854 dsl_prop_set_sync_impl(ds, 3855 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3856 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3857 &ddsqra->ddsqra_value, tx); 3858 3859 VERIFY0(dsl_prop_get_int_ds(ds, 3860 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3861 3862 if (ds->ds_quota != newval) { 3863 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3864 ds->ds_quota = newval; 3865 } 3866 dsl_dataset_rele(ds, FTAG); 3867 } 3868 3869 int 3870 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3871 uint64_t refquota) 3872 { 3873 dsl_dataset_set_qr_arg_t ddsqra; 3874 3875 ddsqra.ddsqra_name = dsname; 3876 ddsqra.ddsqra_source = source; 3877 ddsqra.ddsqra_value = refquota; 3878 3879 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3880 dsl_dataset_set_refquota_sync, &ddsqra, 0, 3881 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 3882 } 3883 3884 static int 3885 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3886 { 3887 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3888 dsl_pool_t *dp = dmu_tx_pool(tx); 3889 dsl_dataset_t *ds; 3890 int error; 3891 uint64_t newval, unique; 3892 3893 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3894 return (SET_ERROR(ENOTSUP)); 3895 3896 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3897 if (error != 0) 3898 return (error); 3899 3900 if (ds->ds_is_snapshot) { 3901 dsl_dataset_rele(ds, FTAG); 3902 return (SET_ERROR(EINVAL)); 3903 } 3904 3905 error = dsl_prop_predict(ds->ds_dir, 3906 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3907 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3908 if (error != 0) { 3909 dsl_dataset_rele(ds, FTAG); 3910 return (error); 3911 } 3912 3913 /* 3914 * If we are doing the preliminary check in open context, the 3915 * space estimates may be inaccurate. 3916 */ 3917 if (!dmu_tx_is_syncing(tx)) { 3918 dsl_dataset_rele(ds, FTAG); 3919 return (0); 3920 } 3921 3922 mutex_enter(&ds->ds_lock); 3923 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3924 dsl_dataset_recalc_head_uniq(ds); 3925 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3926 mutex_exit(&ds->ds_lock); 3927 3928 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3929 uint64_t delta = MAX(unique, newval) - 3930 MAX(unique, ds->ds_reserved); 3931 3932 if (delta > 3933 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3934 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3935 dsl_dataset_rele(ds, FTAG); 3936 return (SET_ERROR(ENOSPC)); 3937 } 3938 } 3939 3940 dsl_dataset_rele(ds, FTAG); 3941 return (0); 3942 } 3943 3944 void 3945 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3946 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3947 { 3948 uint64_t newval; 3949 uint64_t unique; 3950 int64_t delta; 3951 3952 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3953 source, sizeof (value), 1, &value, tx); 3954 3955 VERIFY0(dsl_prop_get_int_ds(ds, 3956 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3957 3958 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3959 mutex_enter(&ds->ds_dir->dd_lock); 3960 mutex_enter(&ds->ds_lock); 3961 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3962 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3963 delta = MAX(0, (int64_t)(newval - unique)) - 3964 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3965 ds->ds_reserved = newval; 3966 mutex_exit(&ds->ds_lock); 3967 3968 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3969 mutex_exit(&ds->ds_dir->dd_lock); 3970 } 3971 3972 static void 3973 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3974 { 3975 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3976 dsl_pool_t *dp = dmu_tx_pool(tx); 3977 dsl_dataset_t *ds; 3978 3979 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3980 dsl_dataset_set_refreservation_sync_impl(ds, 3981 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3982 dsl_dataset_rele(ds, FTAG); 3983 } 3984 3985 int 3986 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3987 uint64_t refreservation) 3988 { 3989 dsl_dataset_set_qr_arg_t ddsqra; 3990 3991 ddsqra.ddsqra_name = dsname; 3992 ddsqra.ddsqra_source = source; 3993 ddsqra.ddsqra_value = refreservation; 3994 3995 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3996 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 3997 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 3998 } 3999 4000 /* 4001 * Return (in *usedp) the amount of space written in new that is not 4002 * present in oldsnap. New may be a snapshot or the head. Old must be 4003 * a snapshot before new, in new's filesystem (or its origin). If not then 4004 * fail and return EINVAL. 4005 * 4006 * The written space is calculated by considering two components: First, we 4007 * ignore any freed space, and calculate the written as new's used space 4008 * minus old's used space. Next, we add in the amount of space that was freed 4009 * between the two snapshots, thus reducing new's used space relative to old's. 4010 * Specifically, this is the space that was born before old->ds_creation_txg, 4011 * and freed before new (ie. on new's deadlist or a previous deadlist). 4012 * 4013 * space freed [---------------------] 4014 * snapshots ---O-------O--------O-------O------ 4015 * oldsnap new 4016 */ 4017 int 4018 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 4019 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4020 { 4021 int err = 0; 4022 uint64_t snapobj; 4023 dsl_pool_t *dp = new->ds_dir->dd_pool; 4024 4025 ASSERT(dsl_pool_config_held(dp)); 4026 4027 *usedp = 0; 4028 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 4029 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 4030 4031 *compp = 0; 4032 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 4033 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 4034 4035 *uncompp = 0; 4036 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 4037 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 4038 4039 snapobj = new->ds_object; 4040 while (snapobj != oldsnap->ds_object) { 4041 dsl_dataset_t *snap; 4042 uint64_t used, comp, uncomp; 4043 4044 if (snapobj == new->ds_object) { 4045 snap = new; 4046 } else { 4047 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 4048 if (err != 0) 4049 break; 4050 } 4051 4052 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 4053 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 4054 /* 4055 * The blocks in the deadlist can not be born after 4056 * ds_prev_snap_txg, so get the whole deadlist space, 4057 * which is more efficient (especially for old-format 4058 * deadlists). Unfortunately the deadlist code 4059 * doesn't have enough information to make this 4060 * optimization itself. 4061 */ 4062 dsl_deadlist_space(&snap->ds_deadlist, 4063 &used, &comp, &uncomp); 4064 } else { 4065 dsl_deadlist_space_range(&snap->ds_deadlist, 4066 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 4067 &used, &comp, &uncomp); 4068 } 4069 *usedp += used; 4070 *compp += comp; 4071 *uncompp += uncomp; 4072 4073 /* 4074 * If we get to the beginning of the chain of snapshots 4075 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 4076 * was not a snapshot of/before new. 4077 */ 4078 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 4079 if (snap != new) 4080 dsl_dataset_rele(snap, FTAG); 4081 if (snapobj == 0) { 4082 err = SET_ERROR(EINVAL); 4083 break; 4084 } 4085 4086 } 4087 return (err); 4088 } 4089 4090 /* 4091 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 4092 * lastsnap, and all snapshots in between are deleted. 4093 * 4094 * blocks that would be freed [---------------------------] 4095 * snapshots ---O-------O--------O-------O--------O 4096 * firstsnap lastsnap 4097 * 4098 * This is the set of blocks that were born after the snap before firstsnap, 4099 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 4100 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 4101 * We calculate this by iterating over the relevant deadlists (from the snap 4102 * after lastsnap, backward to the snap after firstsnap), summing up the 4103 * space on the deadlist that was born after the snap before firstsnap. 4104 */ 4105 int 4106 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 4107 dsl_dataset_t *lastsnap, 4108 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 4109 { 4110 int err = 0; 4111 uint64_t snapobj; 4112 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 4113 4114 ASSERT(firstsnap->ds_is_snapshot); 4115 ASSERT(lastsnap->ds_is_snapshot); 4116 4117 /* 4118 * Check that the snapshots are in the same dsl_dir, and firstsnap 4119 * is before lastsnap. 4120 */ 4121 if (firstsnap->ds_dir != lastsnap->ds_dir || 4122 dsl_dataset_phys(firstsnap)->ds_creation_txg > 4123 dsl_dataset_phys(lastsnap)->ds_creation_txg) 4124 return (SET_ERROR(EINVAL)); 4125 4126 *usedp = *compp = *uncompp = 0; 4127 4128 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 4129 while (snapobj != firstsnap->ds_object) { 4130 dsl_dataset_t *ds; 4131 uint64_t used, comp, uncomp; 4132 4133 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 4134 if (err != 0) 4135 break; 4136 4137 dsl_deadlist_space_range(&ds->ds_deadlist, 4138 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 4139 &used, &comp, &uncomp); 4140 *usedp += used; 4141 *compp += comp; 4142 *uncompp += uncomp; 4143 4144 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 4145 ASSERT3U(snapobj, !=, 0); 4146 dsl_dataset_rele(ds, FTAG); 4147 } 4148 return (err); 4149 } 4150 4151 /* 4152 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 4153 * For example, they could both be snapshots of the same filesystem, and 4154 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 4155 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4156 * filesystem. Or 'earlier' could be the origin's origin. 4157 * 4158 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4159 */ 4160 boolean_t 4161 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4162 uint64_t earlier_txg) 4163 { 4164 dsl_pool_t *dp = later->ds_dir->dd_pool; 4165 int error; 4166 boolean_t ret; 4167 4168 ASSERT(dsl_pool_config_held(dp)); 4169 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4170 4171 if (earlier_txg == 0) 4172 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4173 4174 if (later->ds_is_snapshot && 4175 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4176 return (B_FALSE); 4177 4178 if (later->ds_dir == earlier->ds_dir) 4179 return (B_TRUE); 4180 if (!dsl_dir_is_clone(later->ds_dir)) 4181 return (B_FALSE); 4182 4183 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 4184 return (B_TRUE); 4185 dsl_dataset_t *origin; 4186 error = dsl_dataset_hold_obj(dp, 4187 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4188 if (error != 0) 4189 return (B_FALSE); 4190 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4191 dsl_dataset_rele(origin, FTAG); 4192 return (ret); 4193 } 4194 4195 void 4196 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4197 { 4198 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4199 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4200 } 4201 4202 boolean_t 4203 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4204 { 4205 dmu_object_info_t doi; 4206 4207 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4208 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4209 } 4210 4211 boolean_t 4212 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4213 { 4214 return (dsl_dataset_is_zapified(ds) && 4215 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4216 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4217 } 4218 4219 uint64_t 4220 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4221 { 4222 uint64_t remap_deadlist_obj; 4223 int err; 4224 4225 if (!dsl_dataset_is_zapified(ds)) 4226 return (0); 4227 4228 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4229 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4230 &remap_deadlist_obj); 4231 4232 if (err != 0) { 4233 VERIFY3S(err, ==, ENOENT); 4234 return (0); 4235 } 4236 4237 ASSERT(remap_deadlist_obj != 0); 4238 return (remap_deadlist_obj); 4239 } 4240 4241 boolean_t 4242 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4243 { 4244 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4245 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4246 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4247 } 4248 4249 static void 4250 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4251 dmu_tx_t *tx) 4252 { 4253 ASSERT(obj != 0); 4254 dsl_dataset_zapify(ds, tx); 4255 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4256 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4257 } 4258 4259 static void 4260 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4261 { 4262 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4263 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4264 } 4265 4266 void 4267 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4268 { 4269 uint64_t remap_deadlist_object; 4270 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4271 4272 ASSERT(dmu_tx_is_syncing(tx)); 4273 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4274 4275 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4276 dsl_deadlist_close(&ds->ds_remap_deadlist); 4277 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4278 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4279 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4280 } 4281 4282 void 4283 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4284 { 4285 uint64_t remap_deadlist_obj; 4286 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4287 4288 ASSERT(dmu_tx_is_syncing(tx)); 4289 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4290 /* 4291 * Currently we only create remap deadlists when there are indirect 4292 * vdevs with referenced mappings. 4293 */ 4294 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4295 4296 remap_deadlist_obj = dsl_deadlist_clone( 4297 &ds->ds_deadlist, UINT64_MAX, 4298 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4299 dsl_dataset_set_remap_deadlist_object(ds, 4300 remap_deadlist_obj, tx); 4301 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4302 remap_deadlist_obj); 4303 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4304 } 4305