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_send.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 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 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 dsl_deadlist_open(&ds->ds_deadlist, 544 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 545 uint64_t remap_deadlist_obj = 546 dsl_dataset_get_remap_deadlist_object(ds); 547 if (remap_deadlist_obj != 0) { 548 dsl_deadlist_open(&ds->ds_remap_deadlist, mos, 549 remap_deadlist_obj); 550 } 551 552 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 553 dsl_dataset_evict_async, &ds->ds_dbuf); 554 if (err == 0) 555 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 556 557 if (err != 0 || winner != NULL) { 558 bplist_destroy(&ds->ds_pending_deadlist); 559 dsl_deadlist_close(&ds->ds_deadlist); 560 if (dsl_deadlist_is_open(&ds->ds_remap_deadlist)) 561 dsl_deadlist_close(&ds->ds_remap_deadlist); 562 dsl_bookmark_fini_ds(ds); 563 if (ds->ds_prev) 564 dsl_dataset_rele(ds->ds_prev, ds); 565 dsl_dir_rele(ds->ds_dir, ds); 566 mutex_destroy(&ds->ds_lock); 567 mutex_destroy(&ds->ds_opening_lock); 568 mutex_destroy(&ds->ds_sendstream_lock); 569 refcount_destroy(&ds->ds_longholds); 570 kmem_free(ds, sizeof (dsl_dataset_t)); 571 if (err != 0) { 572 dmu_buf_rele(dbuf, tag); 573 return (err); 574 } 575 ds = winner; 576 } else { 577 ds->ds_fsid_guid = 578 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 579 if (ds->ds_fsid_guid != 580 dsl_dataset_phys(ds)->ds_fsid_guid) { 581 zfs_dbgmsg("ds_fsid_guid changed from " 582 "%llx to %llx for pool %s dataset id %llu", 583 (long long) 584 dsl_dataset_phys(ds)->ds_fsid_guid, 585 (long long)ds->ds_fsid_guid, 586 spa_name(dp->dp_spa), 587 dsobj); 588 } 589 } 590 } 591 ASSERT3P(ds->ds_dbuf, ==, dbuf); 592 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 593 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 594 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 595 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 596 *dsp = ds; 597 return (0); 598 } 599 600 int 601 dsl_dataset_hold(dsl_pool_t *dp, const char *name, 602 void *tag, dsl_dataset_t **dsp) 603 { 604 dsl_dir_t *dd; 605 const char *snapname; 606 uint64_t obj; 607 int err = 0; 608 dsl_dataset_t *ds; 609 610 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 611 if (err != 0) 612 return (err); 613 614 ASSERT(dsl_pool_config_held(dp)); 615 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 616 if (obj != 0) 617 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 618 else 619 err = SET_ERROR(ENOENT); 620 621 /* we may be looking for a snapshot */ 622 if (err == 0 && snapname != NULL) { 623 dsl_dataset_t *snap_ds; 624 625 if (*snapname++ != '@') { 626 dsl_dataset_rele(ds, tag); 627 dsl_dir_rele(dd, FTAG); 628 return (SET_ERROR(ENOENT)); 629 } 630 631 dprintf("looking for snapshot '%s'\n", snapname); 632 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 633 if (err == 0) 634 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 635 dsl_dataset_rele(ds, tag); 636 637 if (err == 0) { 638 mutex_enter(&snap_ds->ds_lock); 639 if (snap_ds->ds_snapname[0] == 0) 640 (void) strlcpy(snap_ds->ds_snapname, snapname, 641 sizeof (snap_ds->ds_snapname)); 642 mutex_exit(&snap_ds->ds_lock); 643 ds = snap_ds; 644 } 645 } 646 if (err == 0) 647 *dsp = ds; 648 dsl_dir_rele(dd, FTAG); 649 return (err); 650 } 651 652 int 653 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 654 void *tag, dsl_dataset_t **dsp) 655 { 656 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 657 if (err != 0) 658 return (err); 659 if (!dsl_dataset_tryown(*dsp, tag)) { 660 dsl_dataset_rele(*dsp, tag); 661 *dsp = NULL; 662 return (SET_ERROR(EBUSY)); 663 } 664 return (0); 665 } 666 667 int 668 dsl_dataset_own(dsl_pool_t *dp, const char *name, 669 void *tag, dsl_dataset_t **dsp) 670 { 671 int err = dsl_dataset_hold(dp, name, tag, dsp); 672 if (err != 0) 673 return (err); 674 if (!dsl_dataset_tryown(*dsp, tag)) { 675 dsl_dataset_rele(*dsp, tag); 676 return (SET_ERROR(EBUSY)); 677 } 678 return (0); 679 } 680 681 /* 682 * See the comment above dsl_pool_hold() for details. In summary, a long 683 * hold is used to prevent destruction of a dataset while the pool hold 684 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 685 * 686 * The dataset and pool must be held when this function is called. After it 687 * is called, the pool hold may be released while the dataset is still held 688 * and accessed. 689 */ 690 void 691 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 692 { 693 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 694 (void) refcount_add(&ds->ds_longholds, tag); 695 } 696 697 void 698 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 699 { 700 (void) refcount_remove(&ds->ds_longholds, tag); 701 } 702 703 /* Return B_TRUE if there are any long holds on this dataset. */ 704 boolean_t 705 dsl_dataset_long_held(dsl_dataset_t *ds) 706 { 707 return (!refcount_is_zero(&ds->ds_longholds)); 708 } 709 710 void 711 dsl_dataset_name(dsl_dataset_t *ds, char *name) 712 { 713 if (ds == NULL) { 714 (void) strcpy(name, "mos"); 715 } else { 716 dsl_dir_name(ds->ds_dir, name); 717 VERIFY0(dsl_dataset_get_snapname(ds)); 718 if (ds->ds_snapname[0]) { 719 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 720 <, ZFS_MAX_DATASET_NAME_LEN); 721 /* 722 * We use a "recursive" mutex so that we 723 * can call dprintf_ds() with ds_lock held. 724 */ 725 if (!MUTEX_HELD(&ds->ds_lock)) { 726 mutex_enter(&ds->ds_lock); 727 VERIFY3U(strlcat(name, ds->ds_snapname, 728 ZFS_MAX_DATASET_NAME_LEN), <, 729 ZFS_MAX_DATASET_NAME_LEN); 730 mutex_exit(&ds->ds_lock); 731 } else { 732 VERIFY3U(strlcat(name, ds->ds_snapname, 733 ZFS_MAX_DATASET_NAME_LEN), <, 734 ZFS_MAX_DATASET_NAME_LEN); 735 } 736 } 737 } 738 } 739 740 int 741 dsl_dataset_namelen(dsl_dataset_t *ds) 742 { 743 VERIFY0(dsl_dataset_get_snapname(ds)); 744 mutex_enter(&ds->ds_lock); 745 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 746 mutex_exit(&ds->ds_lock); 747 return (len); 748 } 749 750 void 751 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 752 { 753 dmu_buf_rele(ds->ds_dbuf, tag); 754 } 755 756 void 757 dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 758 { 759 ASSERT3P(ds->ds_owner, ==, tag); 760 ASSERT(ds->ds_dbuf != NULL); 761 762 mutex_enter(&ds->ds_lock); 763 ds->ds_owner = NULL; 764 mutex_exit(&ds->ds_lock); 765 dsl_dataset_long_rele(ds, tag); 766 dsl_dataset_rele(ds, tag); 767 } 768 769 boolean_t 770 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 771 { 772 boolean_t gotit = FALSE; 773 774 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 775 mutex_enter(&ds->ds_lock); 776 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 777 ds->ds_owner = tag; 778 dsl_dataset_long_hold(ds, tag); 779 gotit = TRUE; 780 } 781 mutex_exit(&ds->ds_lock); 782 return (gotit); 783 } 784 785 boolean_t 786 dsl_dataset_has_owner(dsl_dataset_t *ds) 787 { 788 boolean_t rv; 789 mutex_enter(&ds->ds_lock); 790 rv = (ds->ds_owner != NULL); 791 mutex_exit(&ds->ds_lock); 792 return (rv); 793 } 794 795 static void 796 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 797 { 798 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 799 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 800 uint64_t zero = 0; 801 802 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 803 804 spa_feature_incr(spa, f, tx); 805 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 806 807 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 808 sizeof (zero), 1, &zero, tx)); 809 } 810 811 void 812 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 813 { 814 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 815 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 816 817 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 818 819 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 820 spa_feature_decr(spa, f, tx); 821 } 822 823 uint64_t 824 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 825 uint64_t flags, dmu_tx_t *tx) 826 { 827 dsl_pool_t *dp = dd->dd_pool; 828 dmu_buf_t *dbuf; 829 dsl_dataset_phys_t *dsphys; 830 uint64_t dsobj; 831 objset_t *mos = dp->dp_meta_objset; 832 833 if (origin == NULL) 834 origin = dp->dp_origin_snap; 835 836 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 837 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 838 ASSERT(dmu_tx_is_syncing(tx)); 839 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 840 841 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 842 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 843 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 844 dmu_buf_will_dirty(dbuf, tx); 845 dsphys = dbuf->db_data; 846 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 847 dsphys->ds_dir_obj = dd->dd_object; 848 dsphys->ds_flags = flags; 849 dsphys->ds_fsid_guid = unique_create(); 850 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 851 sizeof (dsphys->ds_guid)); 852 dsphys->ds_snapnames_zapobj = 853 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 854 DMU_OT_NONE, 0, tx); 855 dsphys->ds_creation_time = gethrestime_sec(); 856 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 857 858 if (origin == NULL) { 859 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 860 } else { 861 dsl_dataset_t *ohds; /* head of the origin snapshot */ 862 863 dsphys->ds_prev_snap_obj = origin->ds_object; 864 dsphys->ds_prev_snap_txg = 865 dsl_dataset_phys(origin)->ds_creation_txg; 866 dsphys->ds_referenced_bytes = 867 dsl_dataset_phys(origin)->ds_referenced_bytes; 868 dsphys->ds_compressed_bytes = 869 dsl_dataset_phys(origin)->ds_compressed_bytes; 870 dsphys->ds_uncompressed_bytes = 871 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 872 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 873 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 874 rrw_exit(&origin->ds_bp_rwlock, FTAG); 875 876 /* 877 * Inherit flags that describe the dataset's contents 878 * (INCONSISTENT) or properties (Case Insensitive). 879 */ 880 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 881 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 882 883 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 884 if (origin->ds_feature_inuse[f]) 885 dsl_dataset_activate_feature(dsobj, f, tx); 886 } 887 888 dmu_buf_will_dirty(origin->ds_dbuf, tx); 889 dsl_dataset_phys(origin)->ds_num_children++; 890 891 VERIFY0(dsl_dataset_hold_obj(dp, 892 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 893 FTAG, &ohds)); 894 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 895 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 896 dsl_dataset_rele(ohds, FTAG); 897 898 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 899 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 900 dsl_dataset_phys(origin)->ds_next_clones_obj = 901 zap_create(mos, 902 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 903 } 904 VERIFY0(zap_add_int(mos, 905 dsl_dataset_phys(origin)->ds_next_clones_obj, 906 dsobj, tx)); 907 } 908 909 dmu_buf_will_dirty(dd->dd_dbuf, tx); 910 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 911 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 912 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 913 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 914 dsl_dir_phys(origin->ds_dir)->dd_clones = 915 zap_create(mos, 916 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 917 } 918 VERIFY0(zap_add_int(mos, 919 dsl_dir_phys(origin->ds_dir)->dd_clones, 920 dsobj, tx)); 921 } 922 } 923 924 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 925 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 926 927 dmu_buf_rele(dbuf, FTAG); 928 929 dmu_buf_will_dirty(dd->dd_dbuf, tx); 930 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 931 932 return (dsobj); 933 } 934 935 static void 936 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 937 { 938 objset_t *os; 939 940 VERIFY0(dmu_objset_from_ds(ds, &os)); 941 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 942 dsl_pool_t *dp = ds->ds_dir->dd_pool; 943 zio_t *zio; 944 945 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 946 947 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 948 dsl_dataset_sync(ds, zio, tx); 949 VERIFY0(zio_wait(zio)); 950 951 /* dsl_dataset_sync_done will drop this reference. */ 952 dmu_buf_add_ref(ds->ds_dbuf, ds); 953 dsl_dataset_sync_done(ds, tx); 954 } 955 } 956 957 uint64_t 958 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 959 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 960 { 961 dsl_pool_t *dp = pdd->dd_pool; 962 uint64_t dsobj, ddobj; 963 dsl_dir_t *dd; 964 965 ASSERT(dmu_tx_is_syncing(tx)); 966 ASSERT(lastname[0] != '@'); 967 968 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 969 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 970 971 dsobj = dsl_dataset_create_sync_dd(dd, origin, 972 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 973 974 dsl_deleg_set_create_perms(dd, tx, cr); 975 976 /* 977 * Since we're creating a new node we know it's a leaf, so we can 978 * initialize the counts if the limit feature is active. 979 */ 980 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 981 uint64_t cnt = 0; 982 objset_t *os = dd->dd_pool->dp_meta_objset; 983 984 dsl_dir_zapify(dd, tx); 985 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 986 sizeof (cnt), 1, &cnt, tx)); 987 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 988 sizeof (cnt), 1, &cnt, tx)); 989 } 990 991 dsl_dir_rele(dd, FTAG); 992 993 /* 994 * If we are creating a clone, make sure we zero out any stale 995 * data from the origin snapshots zil header. 996 */ 997 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 998 dsl_dataset_t *ds; 999 1000 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 1001 dsl_dataset_zero_zil(ds, tx); 1002 dsl_dataset_rele(ds, FTAG); 1003 } 1004 1005 return (dsobj); 1006 } 1007 1008 /* 1009 * The unique space in the head dataset can be calculated by subtracting 1010 * the space used in the most recent snapshot, that is still being used 1011 * in this file system, from the space currently in use. To figure out 1012 * the space in the most recent snapshot still in use, we need to take 1013 * the total space used in the snapshot and subtract out the space that 1014 * has been freed up since the snapshot was taken. 1015 */ 1016 void 1017 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1018 { 1019 uint64_t mrs_used; 1020 uint64_t dlused, dlcomp, dluncomp; 1021 1022 ASSERT(!ds->ds_is_snapshot); 1023 1024 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1025 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1026 else 1027 mrs_used = 0; 1028 1029 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1030 1031 ASSERT3U(dlused, <=, mrs_used); 1032 dsl_dataset_phys(ds)->ds_unique_bytes = 1033 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1034 1035 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1036 SPA_VERSION_UNIQUE_ACCURATE) 1037 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1038 } 1039 1040 void 1041 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1042 dmu_tx_t *tx) 1043 { 1044 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1045 uint64_t count; 1046 int err; 1047 1048 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1049 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1050 obj, tx); 1051 /* 1052 * The err should not be ENOENT, but a bug in a previous version 1053 * of the code could cause upgrade_clones_cb() to not set 1054 * ds_next_snap_obj when it should, leading to a missing entry. 1055 * If we knew that the pool was created after 1056 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1057 * ENOENT. However, at least we can check that we don't have 1058 * too many entries in the next_clones_obj even after failing to 1059 * remove this one. 1060 */ 1061 if (err != ENOENT) 1062 VERIFY0(err); 1063 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1064 &count)); 1065 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1066 } 1067 1068 1069 blkptr_t * 1070 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1071 { 1072 return (&dsl_dataset_phys(ds)->ds_bp); 1073 } 1074 1075 spa_t * 1076 dsl_dataset_get_spa(dsl_dataset_t *ds) 1077 { 1078 return (ds->ds_dir->dd_pool->dp_spa); 1079 } 1080 1081 void 1082 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1083 { 1084 dsl_pool_t *dp; 1085 1086 if (ds == NULL) /* this is the meta-objset */ 1087 return; 1088 1089 ASSERT(ds->ds_objset != NULL); 1090 1091 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1092 panic("dirtying snapshot!"); 1093 1094 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1095 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1096 1097 dp = ds->ds_dir->dd_pool; 1098 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1099 /* up the hold count until we can be written out */ 1100 dmu_buf_add_ref(ds->ds_dbuf, ds); 1101 } 1102 } 1103 1104 boolean_t 1105 dsl_dataset_is_dirty(dsl_dataset_t *ds) 1106 { 1107 for (int t = 0; t < TXG_SIZE; t++) { 1108 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1109 ds, t)) 1110 return (B_TRUE); 1111 } 1112 return (B_FALSE); 1113 } 1114 1115 static int 1116 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1117 { 1118 uint64_t asize; 1119 1120 if (!dmu_tx_is_syncing(tx)) 1121 return (0); 1122 1123 /* 1124 * If there's an fs-only reservation, any blocks that might become 1125 * owned by the snapshot dataset must be accommodated by space 1126 * outside of the reservation. 1127 */ 1128 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1129 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1130 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1131 return (SET_ERROR(ENOSPC)); 1132 1133 /* 1134 * Propagate any reserved space for this snapshot to other 1135 * snapshot checks in this sync group. 1136 */ 1137 if (asize > 0) 1138 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1139 1140 return (0); 1141 } 1142 1143 int 1144 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1145 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1146 { 1147 int error; 1148 uint64_t value; 1149 1150 ds->ds_trysnap_txg = tx->tx_txg; 1151 1152 if (!dmu_tx_is_syncing(tx)) 1153 return (0); 1154 1155 /* 1156 * We don't allow multiple snapshots of the same txg. If there 1157 * is already one, try again. 1158 */ 1159 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1160 return (SET_ERROR(EAGAIN)); 1161 1162 /* 1163 * Check for conflicting snapshot name. 1164 */ 1165 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1166 if (error == 0) 1167 return (SET_ERROR(EEXIST)); 1168 if (error != ENOENT) 1169 return (error); 1170 1171 /* 1172 * We don't allow taking snapshots of inconsistent datasets, such as 1173 * those into which we are currently receiving. However, if we are 1174 * creating this snapshot as part of a receive, this check will be 1175 * executed atomically with respect to the completion of the receive 1176 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1177 * case we ignore this, knowing it will be fixed up for us shortly in 1178 * dmu_recv_end_sync(). 1179 */ 1180 if (!recv && DS_IS_INCONSISTENT(ds)) 1181 return (SET_ERROR(EBUSY)); 1182 1183 /* 1184 * Skip the check for temporary snapshots or if we have already checked 1185 * the counts in dsl_dataset_snapshot_check. This means we really only 1186 * check the count here when we're receiving a stream. 1187 */ 1188 if (cnt != 0 && cr != NULL) { 1189 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1190 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1191 if (error != 0) 1192 return (error); 1193 } 1194 1195 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1196 if (error != 0) 1197 return (error); 1198 1199 return (0); 1200 } 1201 1202 int 1203 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1204 { 1205 dsl_dataset_snapshot_arg_t *ddsa = arg; 1206 dsl_pool_t *dp = dmu_tx_pool(tx); 1207 nvpair_t *pair; 1208 int rv = 0; 1209 1210 /* 1211 * Pre-compute how many total new snapshots will be created for each 1212 * level in the tree and below. This is needed for validating the 1213 * snapshot limit when either taking a recursive snapshot or when 1214 * taking multiple snapshots. 1215 * 1216 * The problem is that the counts are not actually adjusted when 1217 * we are checking, only when we finally sync. For a single snapshot, 1218 * this is easy, the count will increase by 1 at each node up the tree, 1219 * but its more complicated for the recursive/multiple snapshot case. 1220 * 1221 * The dsl_fs_ss_limit_check function does recursively check the count 1222 * at each level up the tree but since it is validating each snapshot 1223 * independently we need to be sure that we are validating the complete 1224 * count for the entire set of snapshots. We do this by rolling up the 1225 * counts for each component of the name into an nvlist and then 1226 * checking each of those cases with the aggregated count. 1227 * 1228 * This approach properly handles not only the recursive snapshot 1229 * case (where we get all of those on the ddsa_snaps list) but also 1230 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1231 * validate the limit on 'a' using a count of 2). 1232 * 1233 * We validate the snapshot names in the third loop and only report 1234 * name errors once. 1235 */ 1236 if (dmu_tx_is_syncing(tx)) { 1237 nvlist_t *cnt_track = NULL; 1238 cnt_track = fnvlist_alloc(); 1239 1240 /* Rollup aggregated counts into the cnt_track list */ 1241 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1242 pair != NULL; 1243 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1244 char *pdelim; 1245 uint64_t val; 1246 char nm[MAXPATHLEN]; 1247 1248 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1249 pdelim = strchr(nm, '@'); 1250 if (pdelim == NULL) 1251 continue; 1252 *pdelim = '\0'; 1253 1254 do { 1255 if (nvlist_lookup_uint64(cnt_track, nm, 1256 &val) == 0) { 1257 /* update existing entry */ 1258 fnvlist_add_uint64(cnt_track, nm, 1259 val + 1); 1260 } else { 1261 /* add to list */ 1262 fnvlist_add_uint64(cnt_track, nm, 1); 1263 } 1264 1265 pdelim = strrchr(nm, '/'); 1266 if (pdelim != NULL) 1267 *pdelim = '\0'; 1268 } while (pdelim != NULL); 1269 } 1270 1271 /* Check aggregated counts at each level */ 1272 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1273 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1274 int error = 0; 1275 char *name; 1276 uint64_t cnt = 0; 1277 dsl_dataset_t *ds; 1278 1279 name = nvpair_name(pair); 1280 cnt = fnvpair_value_uint64(pair); 1281 ASSERT(cnt > 0); 1282 1283 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1284 if (error == 0) { 1285 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1286 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1287 ddsa->ddsa_cr); 1288 dsl_dataset_rele(ds, FTAG); 1289 } 1290 1291 if (error != 0) { 1292 if (ddsa->ddsa_errors != NULL) 1293 fnvlist_add_int32(ddsa->ddsa_errors, 1294 name, error); 1295 rv = error; 1296 /* only report one error for this check */ 1297 break; 1298 } 1299 } 1300 nvlist_free(cnt_track); 1301 } 1302 1303 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1304 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1305 int error = 0; 1306 dsl_dataset_t *ds; 1307 char *name, *atp; 1308 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1309 1310 name = nvpair_name(pair); 1311 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1312 error = SET_ERROR(ENAMETOOLONG); 1313 if (error == 0) { 1314 atp = strchr(name, '@'); 1315 if (atp == NULL) 1316 error = SET_ERROR(EINVAL); 1317 if (error == 0) 1318 (void) strlcpy(dsname, name, atp - name + 1); 1319 } 1320 if (error == 0) 1321 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1322 if (error == 0) { 1323 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1324 error = dsl_dataset_snapshot_check_impl(ds, 1325 atp + 1, tx, B_FALSE, 0, NULL); 1326 dsl_dataset_rele(ds, FTAG); 1327 } 1328 1329 if (error != 0) { 1330 if (ddsa->ddsa_errors != NULL) { 1331 fnvlist_add_int32(ddsa->ddsa_errors, 1332 name, error); 1333 } 1334 rv = error; 1335 } 1336 } 1337 1338 return (rv); 1339 } 1340 1341 void 1342 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1343 dmu_tx_t *tx) 1344 { 1345 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1346 dmu_buf_t *dbuf; 1347 dsl_dataset_phys_t *dsphys; 1348 uint64_t dsobj, crtxg; 1349 objset_t *mos = dp->dp_meta_objset; 1350 objset_t *os; 1351 1352 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1353 1354 /* 1355 * If we are on an old pool, the zil must not be active, in which 1356 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1357 */ 1358 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1359 dmu_objset_from_ds(ds, &os) != 0 || 1360 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1361 sizeof (zero_zil)) == 0); 1362 1363 /* Should not snapshot a dirty dataset. */ 1364 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1365 ds, tx->tx_txg)); 1366 1367 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1368 1369 /* 1370 * The origin's ds_creation_txg has to be < TXG_INITIAL 1371 */ 1372 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1373 crtxg = 1; 1374 else 1375 crtxg = tx->tx_txg; 1376 1377 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1378 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1379 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1380 dmu_buf_will_dirty(dbuf, tx); 1381 dsphys = dbuf->db_data; 1382 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1383 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1384 dsphys->ds_fsid_guid = unique_create(); 1385 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1386 sizeof (dsphys->ds_guid)); 1387 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1388 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1389 dsphys->ds_next_snap_obj = ds->ds_object; 1390 dsphys->ds_num_children = 1; 1391 dsphys->ds_creation_time = gethrestime_sec(); 1392 dsphys->ds_creation_txg = crtxg; 1393 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1394 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1395 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1396 dsphys->ds_uncompressed_bytes = 1397 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1398 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1399 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1400 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1401 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1402 dmu_buf_rele(dbuf, FTAG); 1403 1404 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1405 if (ds->ds_feature_inuse[f]) 1406 dsl_dataset_activate_feature(dsobj, f, tx); 1407 } 1408 1409 ASSERT3U(ds->ds_prev != 0, ==, 1410 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1411 if (ds->ds_prev) { 1412 uint64_t next_clones_obj = 1413 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1414 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1415 ds->ds_object || 1416 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1417 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1418 ds->ds_object) { 1419 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1420 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1421 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1422 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1423 } else if (next_clones_obj != 0) { 1424 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1425 dsphys->ds_next_snap_obj, tx); 1426 VERIFY0(zap_add_int(mos, 1427 next_clones_obj, dsobj, tx)); 1428 } 1429 } 1430 1431 /* 1432 * If we have a reference-reservation on this dataset, we will 1433 * need to increase the amount of refreservation being charged 1434 * since our unique space is going to zero. 1435 */ 1436 if (ds->ds_reserved) { 1437 int64_t delta; 1438 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1439 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1440 ds->ds_reserved); 1441 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1442 delta, 0, 0, tx); 1443 } 1444 1445 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1446 dsl_dataset_phys(ds)->ds_deadlist_obj = 1447 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1448 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1449 dsl_deadlist_close(&ds->ds_deadlist); 1450 dsl_deadlist_open(&ds->ds_deadlist, mos, 1451 dsl_dataset_phys(ds)->ds_deadlist_obj); 1452 dsl_deadlist_add_key(&ds->ds_deadlist, 1453 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1454 1455 if (dsl_dataset_remap_deadlist_exists(ds)) { 1456 uint64_t remap_deadlist_obj = 1457 dsl_dataset_get_remap_deadlist_object(ds); 1458 /* 1459 * Move the remap_deadlist to the snapshot. The head 1460 * will create a new remap deadlist on demand, from 1461 * dsl_dataset_block_remapped(). 1462 */ 1463 dsl_dataset_unset_remap_deadlist_object(ds, tx); 1464 dsl_deadlist_close(&ds->ds_remap_deadlist); 1465 1466 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 1467 VERIFY0(zap_add(mos, dsobj, DS_FIELD_REMAP_DEADLIST, 1468 sizeof (remap_deadlist_obj), 1, &remap_deadlist_obj, tx)); 1469 } 1470 1471 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1472 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1473 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1474 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1475 1476 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1477 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1478 1479 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1480 snapname, 8, 1, &dsobj, tx)); 1481 1482 if (ds->ds_prev) 1483 dsl_dataset_rele(ds->ds_prev, ds); 1484 VERIFY0(dsl_dataset_hold_obj(dp, 1485 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1486 1487 dsl_scan_ds_snapshotted(ds, tx); 1488 1489 dsl_dir_snap_cmtime_update(ds->ds_dir); 1490 1491 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1492 } 1493 1494 void 1495 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1496 { 1497 dsl_dataset_snapshot_arg_t *ddsa = arg; 1498 dsl_pool_t *dp = dmu_tx_pool(tx); 1499 nvpair_t *pair; 1500 1501 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1502 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1503 dsl_dataset_t *ds; 1504 char *name, *atp; 1505 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1506 1507 name = nvpair_name(pair); 1508 atp = strchr(name, '@'); 1509 (void) strlcpy(dsname, name, atp - name + 1); 1510 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1511 1512 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1513 if (ddsa->ddsa_props != NULL) { 1514 dsl_props_set_sync_impl(ds->ds_prev, 1515 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1516 } 1517 dsl_dataset_rele(ds, FTAG); 1518 } 1519 } 1520 1521 /* 1522 * The snapshots must all be in the same pool. 1523 * All-or-nothing: if there are any failures, nothing will be modified. 1524 */ 1525 int 1526 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1527 { 1528 dsl_dataset_snapshot_arg_t ddsa; 1529 nvpair_t *pair; 1530 boolean_t needsuspend; 1531 int error; 1532 spa_t *spa; 1533 char *firstname; 1534 nvlist_t *suspended = NULL; 1535 1536 pair = nvlist_next_nvpair(snaps, NULL); 1537 if (pair == NULL) 1538 return (0); 1539 firstname = nvpair_name(pair); 1540 1541 error = spa_open(firstname, &spa, FTAG); 1542 if (error != 0) 1543 return (error); 1544 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1545 spa_close(spa, FTAG); 1546 1547 if (needsuspend) { 1548 suspended = fnvlist_alloc(); 1549 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1550 pair = nvlist_next_nvpair(snaps, pair)) { 1551 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1552 char *snapname = nvpair_name(pair); 1553 char *atp; 1554 void *cookie; 1555 1556 atp = strchr(snapname, '@'); 1557 if (atp == NULL) { 1558 error = SET_ERROR(EINVAL); 1559 break; 1560 } 1561 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1562 1563 error = zil_suspend(fsname, &cookie); 1564 if (error != 0) 1565 break; 1566 fnvlist_add_uint64(suspended, fsname, 1567 (uintptr_t)cookie); 1568 } 1569 } 1570 1571 ddsa.ddsa_snaps = snaps; 1572 ddsa.ddsa_props = props; 1573 ddsa.ddsa_errors = errors; 1574 ddsa.ddsa_cr = CRED(); 1575 1576 if (error == 0) { 1577 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1578 dsl_dataset_snapshot_sync, &ddsa, 1579 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1580 } 1581 1582 if (suspended != NULL) { 1583 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1584 pair = nvlist_next_nvpair(suspended, pair)) { 1585 zil_resume((void *)(uintptr_t) 1586 fnvpair_value_uint64(pair)); 1587 } 1588 fnvlist_free(suspended); 1589 } 1590 1591 return (error); 1592 } 1593 1594 typedef struct dsl_dataset_snapshot_tmp_arg { 1595 const char *ddsta_fsname; 1596 const char *ddsta_snapname; 1597 minor_t ddsta_cleanup_minor; 1598 const char *ddsta_htag; 1599 } dsl_dataset_snapshot_tmp_arg_t; 1600 1601 static int 1602 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1603 { 1604 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1605 dsl_pool_t *dp = dmu_tx_pool(tx); 1606 dsl_dataset_t *ds; 1607 int error; 1608 1609 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1610 if (error != 0) 1611 return (error); 1612 1613 /* NULL cred means no limit check for tmp snapshot */ 1614 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1615 tx, B_FALSE, 0, NULL); 1616 if (error != 0) { 1617 dsl_dataset_rele(ds, FTAG); 1618 return (error); 1619 } 1620 1621 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1622 dsl_dataset_rele(ds, FTAG); 1623 return (SET_ERROR(ENOTSUP)); 1624 } 1625 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1626 B_TRUE, tx); 1627 if (error != 0) { 1628 dsl_dataset_rele(ds, FTAG); 1629 return (error); 1630 } 1631 1632 dsl_dataset_rele(ds, FTAG); 1633 return (0); 1634 } 1635 1636 static void 1637 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1638 { 1639 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1640 dsl_pool_t *dp = dmu_tx_pool(tx); 1641 dsl_dataset_t *ds; 1642 1643 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1644 1645 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1646 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1647 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1648 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1649 1650 dsl_dataset_rele(ds, FTAG); 1651 } 1652 1653 int 1654 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1655 minor_t cleanup_minor, const char *htag) 1656 { 1657 dsl_dataset_snapshot_tmp_arg_t ddsta; 1658 int error; 1659 spa_t *spa; 1660 boolean_t needsuspend; 1661 void *cookie; 1662 1663 ddsta.ddsta_fsname = fsname; 1664 ddsta.ddsta_snapname = snapname; 1665 ddsta.ddsta_cleanup_minor = cleanup_minor; 1666 ddsta.ddsta_htag = htag; 1667 1668 error = spa_open(fsname, &spa, FTAG); 1669 if (error != 0) 1670 return (error); 1671 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1672 spa_close(spa, FTAG); 1673 1674 if (needsuspend) { 1675 error = zil_suspend(fsname, &cookie); 1676 if (error != 0) 1677 return (error); 1678 } 1679 1680 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1681 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1682 1683 if (needsuspend) 1684 zil_resume(cookie); 1685 return (error); 1686 } 1687 1688 void 1689 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1690 { 1691 ASSERT(dmu_tx_is_syncing(tx)); 1692 ASSERT(ds->ds_objset != NULL); 1693 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1694 1695 /* 1696 * in case we had to change ds_fsid_guid when we opened it, 1697 * sync it out now. 1698 */ 1699 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1700 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1701 1702 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1703 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1704 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1705 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1706 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1707 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1708 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1709 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1710 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1711 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1712 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1713 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1714 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1715 } 1716 1717 dmu_objset_sync(ds->ds_objset, zio, tx); 1718 1719 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1720 if (ds->ds_feature_activation_needed[f]) { 1721 if (ds->ds_feature_inuse[f]) 1722 continue; 1723 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1724 ds->ds_feature_inuse[f] = B_TRUE; 1725 } 1726 } 1727 } 1728 1729 static int 1730 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 1731 { 1732 dsl_deadlist_t *dl = arg; 1733 dsl_deadlist_insert(dl, bp, tx); 1734 return (0); 1735 } 1736 1737 void 1738 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 1739 { 1740 objset_t *os = ds->ds_objset; 1741 1742 bplist_iterate(&ds->ds_pending_deadlist, 1743 deadlist_enqueue_cb, &ds->ds_deadlist, tx); 1744 1745 if (os->os_synced_dnodes != NULL) { 1746 multilist_destroy(os->os_synced_dnodes); 1747 os->os_synced_dnodes = NULL; 1748 } 1749 1750 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 1751 1752 dmu_buf_rele(ds->ds_dbuf, ds); 1753 } 1754 1755 int 1756 get_clones_stat_impl(dsl_dataset_t *ds, nvlist_t *val) 1757 { 1758 uint64_t count = 0; 1759 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1760 zap_cursor_t zc; 1761 zap_attribute_t za; 1762 1763 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1764 1765 /* 1766 * There may be missing entries in ds_next_clones_obj 1767 * due to a bug in a previous version of the code. 1768 * Only trust it if it has the right number of entries. 1769 */ 1770 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1771 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1772 &count)); 1773 } 1774 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) { 1775 return (ENOENT); 1776 } 1777 for (zap_cursor_init(&zc, mos, 1778 dsl_dataset_phys(ds)->ds_next_clones_obj); 1779 zap_cursor_retrieve(&zc, &za) == 0; 1780 zap_cursor_advance(&zc)) { 1781 dsl_dataset_t *clone; 1782 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1783 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1784 za.za_first_integer, FTAG, &clone)); 1785 dsl_dir_name(clone->ds_dir, buf); 1786 fnvlist_add_boolean(val, buf); 1787 dsl_dataset_rele(clone, FTAG); 1788 } 1789 zap_cursor_fini(&zc); 1790 return (0); 1791 } 1792 1793 void 1794 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1795 { 1796 nvlist_t *propval = fnvlist_alloc(); 1797 nvlist_t *val; 1798 1799 /* 1800 * We use nvlist_alloc() instead of fnvlist_alloc() because the 1801 * latter would allocate the list with NV_UNIQUE_NAME flag. 1802 * As a result, every time a clone name is appended to the list 1803 * it would be (linearly) searched for for a duplicate name. 1804 * We already know that all clone names must be unique and we 1805 * want avoid the quadratic complexity of double-checking that 1806 * because we can have a large number of clones. 1807 */ 1808 VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP)); 1809 1810 if (get_clones_stat_impl(ds, val) == 0) { 1811 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1812 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), 1813 propval); 1814 } 1815 1816 nvlist_free(val); 1817 nvlist_free(propval); 1818 } 1819 1820 /* 1821 * Returns a string that represents the receive resume stats token. It should 1822 * be freed with strfree(). 1823 */ 1824 char * 1825 get_receive_resume_stats_impl(dsl_dataset_t *ds) 1826 { 1827 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1828 1829 if (dsl_dataset_has_resume_receive_state(ds)) { 1830 char *str; 1831 void *packed; 1832 uint8_t *compressed; 1833 uint64_t val; 1834 nvlist_t *token_nv = fnvlist_alloc(); 1835 size_t packed_size, compressed_size; 1836 1837 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1838 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1839 fnvlist_add_uint64(token_nv, "fromguid", val); 1840 } 1841 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1842 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1843 fnvlist_add_uint64(token_nv, "object", val); 1844 } 1845 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1846 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1847 fnvlist_add_uint64(token_nv, "offset", val); 1848 } 1849 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1850 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1851 fnvlist_add_uint64(token_nv, "bytes", val); 1852 } 1853 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1854 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1855 fnvlist_add_uint64(token_nv, "toguid", val); 1856 } 1857 char buf[256]; 1858 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1859 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1860 fnvlist_add_string(token_nv, "toname", buf); 1861 } 1862 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1863 DS_FIELD_RESUME_LARGEBLOCK) == 0) { 1864 fnvlist_add_boolean(token_nv, "largeblockok"); 1865 } 1866 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1867 DS_FIELD_RESUME_EMBEDOK) == 0) { 1868 fnvlist_add_boolean(token_nv, "embedok"); 1869 } 1870 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1871 DS_FIELD_RESUME_COMPRESSOK) == 0) { 1872 fnvlist_add_boolean(token_nv, "compressok"); 1873 } 1874 packed = fnvlist_pack(token_nv, &packed_size); 1875 fnvlist_free(token_nv); 1876 compressed = kmem_alloc(packed_size, KM_SLEEP); 1877 1878 compressed_size = gzip_compress(packed, compressed, 1879 packed_size, packed_size, 6); 1880 1881 zio_cksum_t cksum; 1882 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1883 1884 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1885 for (int i = 0; i < compressed_size; i++) { 1886 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1887 } 1888 str[compressed_size * 2] = '\0'; 1889 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1890 ZFS_SEND_RESUME_TOKEN_VERSION, 1891 (longlong_t)cksum.zc_word[0], 1892 (longlong_t)packed_size, str); 1893 kmem_free(packed, packed_size); 1894 kmem_free(str, compressed_size * 2 + 1); 1895 kmem_free(compressed, packed_size); 1896 return (propval); 1897 } 1898 return (strdup("")); 1899 } 1900 1901 /* 1902 * Returns a string that represents the receive resume stats token of the 1903 * dataset's child. It should be freed with strfree(). 1904 */ 1905 char * 1906 get_child_receive_stats(dsl_dataset_t *ds) 1907 { 1908 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1909 dsl_dataset_t *recv_ds; 1910 dsl_dataset_name(ds, recvname); 1911 if (strlcat(recvname, "/", sizeof (recvname)) < 1912 sizeof (recvname) && 1913 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 1914 sizeof (recvname) && 1915 dsl_dataset_hold(ds->ds_dir->dd_pool, recvname, FTAG, 1916 &recv_ds) == 0) { 1917 char *propval = get_receive_resume_stats_impl(recv_ds); 1918 dsl_dataset_rele(recv_ds, FTAG); 1919 return (propval); 1920 } 1921 return (strdup("")); 1922 } 1923 1924 static void 1925 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1926 { 1927 char *propval = get_receive_resume_stats_impl(ds); 1928 if (strcmp(propval, "") != 0) { 1929 dsl_prop_nvlist_add_string(nv, 1930 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1931 } else { 1932 char *childval = get_child_receive_stats(ds); 1933 if (strcmp(childval, "") != 0) { 1934 dsl_prop_nvlist_add_string(nv, 1935 ZFS_PROP_RECEIVE_RESUME_TOKEN, childval); 1936 } 1937 strfree(childval); 1938 } 1939 strfree(propval); 1940 } 1941 1942 uint64_t 1943 dsl_get_refratio(dsl_dataset_t *ds) 1944 { 1945 uint64_t ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1946 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1947 dsl_dataset_phys(ds)->ds_compressed_bytes); 1948 return (ratio); 1949 } 1950 1951 uint64_t 1952 dsl_get_logicalreferenced(dsl_dataset_t *ds) 1953 { 1954 return (dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1955 } 1956 1957 uint64_t 1958 dsl_get_compressratio(dsl_dataset_t *ds) 1959 { 1960 if (ds->ds_is_snapshot) { 1961 return (dsl_get_refratio(ds)); 1962 } else { 1963 dsl_dir_t *dd = ds->ds_dir; 1964 mutex_enter(&dd->dd_lock); 1965 uint64_t val = dsl_dir_get_compressratio(dd); 1966 mutex_exit(&dd->dd_lock); 1967 return (val); 1968 } 1969 } 1970 1971 uint64_t 1972 dsl_get_used(dsl_dataset_t *ds) 1973 { 1974 if (ds->ds_is_snapshot) { 1975 return (dsl_dataset_phys(ds)->ds_unique_bytes); 1976 } else { 1977 dsl_dir_t *dd = ds->ds_dir; 1978 mutex_enter(&dd->dd_lock); 1979 uint64_t val = dsl_dir_get_used(dd); 1980 mutex_exit(&dd->dd_lock); 1981 return (val); 1982 } 1983 } 1984 1985 uint64_t 1986 dsl_get_creation(dsl_dataset_t *ds) 1987 { 1988 return (dsl_dataset_phys(ds)->ds_creation_time); 1989 } 1990 1991 uint64_t 1992 dsl_get_creationtxg(dsl_dataset_t *ds) 1993 { 1994 return (dsl_dataset_phys(ds)->ds_creation_txg); 1995 } 1996 1997 uint64_t 1998 dsl_get_refquota(dsl_dataset_t *ds) 1999 { 2000 return (ds->ds_quota); 2001 } 2002 2003 uint64_t 2004 dsl_get_refreservation(dsl_dataset_t *ds) 2005 { 2006 return (ds->ds_reserved); 2007 } 2008 2009 uint64_t 2010 dsl_get_guid(dsl_dataset_t *ds) 2011 { 2012 return (dsl_dataset_phys(ds)->ds_guid); 2013 } 2014 2015 uint64_t 2016 dsl_get_unique(dsl_dataset_t *ds) 2017 { 2018 return (dsl_dataset_phys(ds)->ds_unique_bytes); 2019 } 2020 2021 uint64_t 2022 dsl_get_objsetid(dsl_dataset_t *ds) 2023 { 2024 return (ds->ds_object); 2025 } 2026 2027 uint64_t 2028 dsl_get_userrefs(dsl_dataset_t *ds) 2029 { 2030 return (ds->ds_userrefs); 2031 } 2032 2033 uint64_t 2034 dsl_get_defer_destroy(dsl_dataset_t *ds) 2035 { 2036 return (DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 2037 } 2038 2039 uint64_t 2040 dsl_get_referenced(dsl_dataset_t *ds) 2041 { 2042 return (dsl_dataset_phys(ds)->ds_referenced_bytes); 2043 } 2044 2045 uint64_t 2046 dsl_get_numclones(dsl_dataset_t *ds) 2047 { 2048 ASSERT(ds->ds_is_snapshot); 2049 return (dsl_dataset_phys(ds)->ds_num_children - 1); 2050 } 2051 2052 uint64_t 2053 dsl_get_inconsistent(dsl_dataset_t *ds) 2054 { 2055 return ((dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT) ? 2056 1 : 0); 2057 } 2058 2059 uint64_t 2060 dsl_get_available(dsl_dataset_t *ds) 2061 { 2062 uint64_t refdbytes = dsl_get_referenced(ds); 2063 uint64_t availbytes = dsl_dir_space_available(ds->ds_dir, 2064 NULL, 0, TRUE); 2065 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2066 availbytes += 2067 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2068 } 2069 if (ds->ds_quota != 0) { 2070 /* 2071 * Adjust available bytes according to refquota 2072 */ 2073 if (refdbytes < ds->ds_quota) { 2074 availbytes = MIN(availbytes, 2075 ds->ds_quota - refdbytes); 2076 } else { 2077 availbytes = 0; 2078 } 2079 } 2080 return (availbytes); 2081 } 2082 2083 int 2084 dsl_get_written(dsl_dataset_t *ds, uint64_t *written) 2085 { 2086 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2087 dsl_dataset_t *prev; 2088 int err = dsl_dataset_hold_obj(dp, 2089 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 2090 if (err == 0) { 2091 uint64_t comp, uncomp; 2092 err = dsl_dataset_space_written(prev, ds, written, 2093 &comp, &uncomp); 2094 dsl_dataset_rele(prev, FTAG); 2095 } 2096 return (err); 2097 } 2098 2099 /* 2100 * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN. 2101 */ 2102 int 2103 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap) 2104 { 2105 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2106 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 2107 dsl_dataset_name(ds->ds_prev, snap); 2108 return (0); 2109 } else { 2110 return (ENOENT); 2111 } 2112 } 2113 2114 /* 2115 * Returns the mountpoint property and source for the given dataset in the value 2116 * and source buffers. The value buffer must be at least as large as MAXPATHLEN 2117 * and the source buffer as least as large a ZFS_MAX_DATASET_NAME_LEN. 2118 * Returns 0 on success and an error on failure. 2119 */ 2120 int 2121 dsl_get_mountpoint(dsl_dataset_t *ds, const char *dsname, char *value, 2122 char *source) 2123 { 2124 int error; 2125 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2126 2127 /* Retrieve the mountpoint value stored in the zap opbject */ 2128 error = dsl_prop_get_ds(ds, zfs_prop_to_name(ZFS_PROP_MOUNTPOINT), 1, 2129 ZAP_MAXVALUELEN, value, source); 2130 if (error != 0) { 2131 return (error); 2132 } 2133 2134 /* Process the dsname and source to find the full mountpoint string */ 2135 if (value[0] == '/') { 2136 char *buf = kmem_alloc(ZAP_MAXVALUELEN, KM_SLEEP); 2137 char *root = buf; 2138 const char *relpath; 2139 2140 /* 2141 * If we inherit the mountpoint, even from a dataset 2142 * with a received value, the source will be the path of 2143 * the dataset we inherit from. If source is 2144 * ZPROP_SOURCE_VAL_RECVD, the received value is not 2145 * inherited. 2146 */ 2147 if (strcmp(source, ZPROP_SOURCE_VAL_RECVD) == 0) { 2148 relpath = ""; 2149 } else { 2150 ASSERT0(strncmp(dsname, source, strlen(source))); 2151 relpath = dsname + strlen(source); 2152 if (relpath[0] == '/') 2153 relpath++; 2154 } 2155 2156 spa_altroot(dp->dp_spa, root, ZAP_MAXVALUELEN); 2157 2158 /* 2159 * Special case an alternate root of '/'. This will 2160 * avoid having multiple leading slashes in the 2161 * mountpoint path. 2162 */ 2163 if (strcmp(root, "/") == 0) 2164 root++; 2165 2166 /* 2167 * If the mountpoint is '/' then skip over this 2168 * if we are obtaining either an alternate root or 2169 * an inherited mountpoint. 2170 */ 2171 char *mnt = value; 2172 if (value[1] == '\0' && (root[0] != '\0' || 2173 relpath[0] != '\0')) 2174 mnt = value + 1; 2175 2176 if (relpath[0] == '\0') { 2177 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s", 2178 root, mnt); 2179 } else { 2180 (void) snprintf(value, ZAP_MAXVALUELEN, "%s%s%s%s", 2181 root, mnt, relpath[0] == '@' ? "" : "/", 2182 relpath); 2183 } 2184 kmem_free(buf, ZAP_MAXVALUELEN); 2185 } else { 2186 /* 'legacy' or 'none' */ 2187 (void) snprintf(value, ZAP_MAXVALUELEN, "%s", value); 2188 } 2189 return (0); 2190 } 2191 2192 void 2193 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 2194 { 2195 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2196 2197 ASSERT(dsl_pool_config_held(dp)); 2198 2199 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, 2200 dsl_get_refratio(ds)); 2201 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 2202 dsl_get_logicalreferenced(ds)); 2203 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 2204 dsl_get_compressratio(ds)); 2205 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 2206 dsl_get_used(ds)); 2207 2208 if (ds->ds_is_snapshot) { 2209 get_clones_stat(ds, nv); 2210 } else { 2211 char buf[ZFS_MAX_DATASET_NAME_LEN]; 2212 if (dsl_get_prev_snap(ds, buf) == 0) 2213 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, 2214 buf); 2215 dsl_dir_stats(ds->ds_dir, nv); 2216 } 2217 2218 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, 2219 dsl_get_available(ds)); 2220 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, 2221 dsl_get_referenced(ds)); 2222 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 2223 dsl_get_creation(ds)); 2224 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 2225 dsl_get_creationtxg(ds)); 2226 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 2227 dsl_get_refquota(ds)); 2228 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 2229 dsl_get_refreservation(ds)); 2230 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 2231 dsl_get_guid(ds)); 2232 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 2233 dsl_get_unique(ds)); 2234 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 2235 dsl_get_objsetid(ds)); 2236 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 2237 dsl_get_userrefs(ds)); 2238 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 2239 dsl_get_defer_destroy(ds)); 2240 2241 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 2242 uint64_t written; 2243 if (dsl_get_written(ds, &written) == 0) { 2244 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 2245 written); 2246 } 2247 } 2248 2249 if (!dsl_dataset_is_snapshot(ds)) { 2250 /* 2251 * A failed "newfs" (e.g. full) resumable receive leaves 2252 * the stats set on this dataset. Check here for the prop. 2253 */ 2254 get_receive_resume_stats(ds, nv); 2255 2256 /* 2257 * A failed incremental resumable receive leaves the 2258 * stats set on our child named "%recv". Check the child 2259 * for the prop. 2260 */ 2261 /* 6 extra bytes for /%recv */ 2262 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 2263 dsl_dataset_t *recv_ds; 2264 dsl_dataset_name(ds, recvname); 2265 if (strlcat(recvname, "/", sizeof (recvname)) < 2266 sizeof (recvname) && 2267 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2268 sizeof (recvname) && 2269 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 2270 get_receive_resume_stats(recv_ds, nv); 2271 dsl_dataset_rele(recv_ds, FTAG); 2272 } 2273 } 2274 } 2275 2276 void 2277 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2278 { 2279 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2280 ASSERT(dsl_pool_config_held(dp)); 2281 2282 stat->dds_creation_txg = dsl_get_creationtxg(ds); 2283 stat->dds_inconsistent = dsl_get_inconsistent(ds); 2284 stat->dds_guid = dsl_get_guid(ds); 2285 stat->dds_origin[0] = '\0'; 2286 if (ds->ds_is_snapshot) { 2287 stat->dds_is_snapshot = B_TRUE; 2288 stat->dds_num_clones = dsl_get_numclones(ds); 2289 } else { 2290 stat->dds_is_snapshot = B_FALSE; 2291 stat->dds_num_clones = 0; 2292 2293 if (dsl_dir_is_clone(ds->ds_dir)) { 2294 dsl_dir_get_origin(ds->ds_dir, stat->dds_origin); 2295 } 2296 } 2297 } 2298 2299 uint64_t 2300 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2301 { 2302 return (ds->ds_fsid_guid); 2303 } 2304 2305 void 2306 dsl_dataset_space(dsl_dataset_t *ds, 2307 uint64_t *refdbytesp, uint64_t *availbytesp, 2308 uint64_t *usedobjsp, uint64_t *availobjsp) 2309 { 2310 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2311 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2312 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2313 *availbytesp += 2314 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2315 if (ds->ds_quota != 0) { 2316 /* 2317 * Adjust available bytes according to refquota 2318 */ 2319 if (*refdbytesp < ds->ds_quota) 2320 *availbytesp = MIN(*availbytesp, 2321 ds->ds_quota - *refdbytesp); 2322 else 2323 *availbytesp = 0; 2324 } 2325 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2326 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2327 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2328 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2329 } 2330 2331 boolean_t 2332 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2333 { 2334 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2335 uint64_t birth; 2336 2337 ASSERT(dsl_pool_config_held(dp)); 2338 if (snap == NULL) 2339 return (B_FALSE); 2340 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2341 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2342 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2343 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2344 objset_t *os, *os_snap; 2345 /* 2346 * It may be that only the ZIL differs, because it was 2347 * reset in the head. Don't count that as being 2348 * modified. 2349 */ 2350 if (dmu_objset_from_ds(ds, &os) != 0) 2351 return (B_TRUE); 2352 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2353 return (B_TRUE); 2354 return (bcmp(&os->os_phys->os_meta_dnode, 2355 &os_snap->os_phys->os_meta_dnode, 2356 sizeof (os->os_phys->os_meta_dnode)) != 0); 2357 } 2358 return (B_FALSE); 2359 } 2360 2361 typedef struct dsl_dataset_rename_snapshot_arg { 2362 const char *ddrsa_fsname; 2363 const char *ddrsa_oldsnapname; 2364 const char *ddrsa_newsnapname; 2365 boolean_t ddrsa_recursive; 2366 dmu_tx_t *ddrsa_tx; 2367 } dsl_dataset_rename_snapshot_arg_t; 2368 2369 /* ARGSUSED */ 2370 static int 2371 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2372 dsl_dataset_t *hds, void *arg) 2373 { 2374 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2375 int error; 2376 uint64_t val; 2377 2378 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2379 if (error != 0) { 2380 /* ignore nonexistent snapshots */ 2381 return (error == ENOENT ? 0 : error); 2382 } 2383 2384 /* new name should not exist */ 2385 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2386 if (error == 0) 2387 error = SET_ERROR(EEXIST); 2388 else if (error == ENOENT) 2389 error = 0; 2390 2391 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2392 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2393 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2394 error = SET_ERROR(ENAMETOOLONG); 2395 2396 return (error); 2397 } 2398 2399 static int 2400 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2401 { 2402 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2403 dsl_pool_t *dp = dmu_tx_pool(tx); 2404 dsl_dataset_t *hds; 2405 int error; 2406 2407 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2408 if (error != 0) 2409 return (error); 2410 2411 if (ddrsa->ddrsa_recursive) { 2412 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2413 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2414 DS_FIND_CHILDREN); 2415 } else { 2416 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2417 } 2418 dsl_dataset_rele(hds, FTAG); 2419 return (error); 2420 } 2421 2422 static int 2423 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2424 dsl_dataset_t *hds, void *arg) 2425 { 2426 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2427 dsl_dataset_t *ds; 2428 uint64_t val; 2429 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2430 int error; 2431 2432 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2433 ASSERT(error == 0 || error == ENOENT); 2434 if (error == ENOENT) { 2435 /* ignore nonexistent snapshots */ 2436 return (0); 2437 } 2438 2439 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2440 2441 /* log before we change the name */ 2442 spa_history_log_internal_ds(ds, "rename", tx, 2443 "-> @%s", ddrsa->ddrsa_newsnapname); 2444 2445 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2446 B_FALSE)); 2447 mutex_enter(&ds->ds_lock); 2448 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2449 mutex_exit(&ds->ds_lock); 2450 VERIFY0(zap_add(dp->dp_meta_objset, 2451 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2452 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2453 2454 dsl_dataset_rele(ds, FTAG); 2455 return (0); 2456 } 2457 2458 static void 2459 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2460 { 2461 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2462 dsl_pool_t *dp = dmu_tx_pool(tx); 2463 dsl_dataset_t *hds; 2464 2465 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2466 ddrsa->ddrsa_tx = tx; 2467 if (ddrsa->ddrsa_recursive) { 2468 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2469 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2470 DS_FIND_CHILDREN)); 2471 } else { 2472 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2473 } 2474 dsl_dataset_rele(hds, FTAG); 2475 } 2476 2477 int 2478 dsl_dataset_rename_snapshot(const char *fsname, 2479 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2480 { 2481 dsl_dataset_rename_snapshot_arg_t ddrsa; 2482 2483 ddrsa.ddrsa_fsname = fsname; 2484 ddrsa.ddrsa_oldsnapname = oldsnapname; 2485 ddrsa.ddrsa_newsnapname = newsnapname; 2486 ddrsa.ddrsa_recursive = recursive; 2487 2488 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2489 dsl_dataset_rename_snapshot_sync, &ddrsa, 2490 1, ZFS_SPACE_CHECK_RESERVED)); 2491 } 2492 2493 /* 2494 * If we're doing an ownership handoff, we need to make sure that there is 2495 * only one long hold on the dataset. We're not allowed to change anything here 2496 * so we don't permanently release the long hold or regular hold here. We want 2497 * to do this only when syncing to avoid the dataset unexpectedly going away 2498 * when we release the long hold. 2499 */ 2500 static int 2501 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2502 { 2503 boolean_t held; 2504 2505 if (!dmu_tx_is_syncing(tx)) 2506 return (0); 2507 2508 if (owner != NULL) { 2509 VERIFY3P(ds->ds_owner, ==, owner); 2510 dsl_dataset_long_rele(ds, owner); 2511 } 2512 2513 held = dsl_dataset_long_held(ds); 2514 2515 if (owner != NULL) 2516 dsl_dataset_long_hold(ds, owner); 2517 2518 if (held) 2519 return (SET_ERROR(EBUSY)); 2520 2521 return (0); 2522 } 2523 2524 int 2525 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2526 { 2527 dsl_dataset_rollback_arg_t *ddra = arg; 2528 dsl_pool_t *dp = dmu_tx_pool(tx); 2529 dsl_dataset_t *ds; 2530 int64_t unused_refres_delta; 2531 int error; 2532 2533 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2534 if (error != 0) 2535 return (error); 2536 2537 /* must not be a snapshot */ 2538 if (ds->ds_is_snapshot) { 2539 dsl_dataset_rele(ds, FTAG); 2540 return (SET_ERROR(EINVAL)); 2541 } 2542 2543 /* must have a most recent snapshot */ 2544 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2545 dsl_dataset_rele(ds, FTAG); 2546 return (SET_ERROR(ESRCH)); 2547 } 2548 2549 /* 2550 * No rollback to a snapshot created in the current txg, because 2551 * the rollback may dirty the dataset and create blocks that are 2552 * not reachable from the rootbp while having a birth txg that 2553 * falls into the snapshot's range. 2554 */ 2555 if (dmu_tx_is_syncing(tx) && 2556 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 2557 dsl_dataset_rele(ds, FTAG); 2558 return (SET_ERROR(EAGAIN)); 2559 } 2560 2561 /* 2562 * If the expected target snapshot is specified, then check that 2563 * the latest snapshot is it. 2564 */ 2565 if (ddra->ddra_tosnap != NULL) { 2566 dsl_dataset_t *snapds; 2567 2568 /* Check if the target snapshot exists at all. */ 2569 error = dsl_dataset_hold(dp, ddra->ddra_tosnap, FTAG, &snapds); 2570 if (error != 0) { 2571 /* 2572 * ESRCH is used to signal that the target snapshot does 2573 * not exist, while ENOENT is used to report that 2574 * the rolled back dataset does not exist. 2575 * ESRCH is also used to cover other cases where the 2576 * target snapshot is not related to the dataset being 2577 * rolled back such as being in a different pool. 2578 */ 2579 if (error == ENOENT || error == EXDEV) 2580 error = SET_ERROR(ESRCH); 2581 dsl_dataset_rele(ds, FTAG); 2582 return (error); 2583 } 2584 ASSERT(snapds->ds_is_snapshot); 2585 2586 /* Check if the snapshot is the latest snapshot indeed. */ 2587 if (snapds != ds->ds_prev) { 2588 /* 2589 * Distinguish between the case where the only problem 2590 * is intervening snapshots (EEXIST) vs the snapshot 2591 * not being a valid target for rollback (ESRCH). 2592 */ 2593 if (snapds->ds_dir == ds->ds_dir || 2594 (dsl_dir_is_clone(ds->ds_dir) && 2595 dsl_dir_phys(ds->ds_dir)->dd_origin_obj == 2596 snapds->ds_object)) { 2597 error = SET_ERROR(EEXIST); 2598 } else { 2599 error = SET_ERROR(ESRCH); 2600 } 2601 dsl_dataset_rele(snapds, FTAG); 2602 dsl_dataset_rele(ds, FTAG); 2603 return (error); 2604 } 2605 dsl_dataset_rele(snapds, FTAG); 2606 } 2607 2608 /* must not have any bookmarks after the most recent snapshot */ 2609 nvlist_t *proprequest = fnvlist_alloc(); 2610 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2611 nvlist_t *bookmarks = fnvlist_alloc(); 2612 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2613 fnvlist_free(proprequest); 2614 if (error != 0) { 2615 dsl_dataset_rele(ds, FTAG); 2616 return (error); 2617 } 2618 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2619 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2620 nvlist_t *valuenv = 2621 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2622 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2623 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2624 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2625 fnvlist_free(bookmarks); 2626 dsl_dataset_rele(ds, FTAG); 2627 return (SET_ERROR(EEXIST)); 2628 } 2629 } 2630 fnvlist_free(bookmarks); 2631 2632 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2633 if (error != 0) { 2634 dsl_dataset_rele(ds, FTAG); 2635 return (error); 2636 } 2637 2638 /* 2639 * Check if the snap we are rolling back to uses more than 2640 * the refquota. 2641 */ 2642 if (ds->ds_quota != 0 && 2643 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2644 dsl_dataset_rele(ds, FTAG); 2645 return (SET_ERROR(EDQUOT)); 2646 } 2647 2648 /* 2649 * When we do the clone swap, we will temporarily use more space 2650 * due to the refreservation (the head will no longer have any 2651 * unique space, so the entire amount of the refreservation will need 2652 * to be free). We will immediately destroy the clone, freeing 2653 * this space, but the freeing happens over many txg's. 2654 */ 2655 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2656 dsl_dataset_phys(ds)->ds_unique_bytes); 2657 2658 if (unused_refres_delta > 0 && 2659 unused_refres_delta > 2660 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2661 dsl_dataset_rele(ds, FTAG); 2662 return (SET_ERROR(ENOSPC)); 2663 } 2664 2665 dsl_dataset_rele(ds, FTAG); 2666 return (0); 2667 } 2668 2669 void 2670 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2671 { 2672 dsl_dataset_rollback_arg_t *ddra = arg; 2673 dsl_pool_t *dp = dmu_tx_pool(tx); 2674 dsl_dataset_t *ds, *clone; 2675 uint64_t cloneobj; 2676 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2677 2678 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2679 2680 dsl_dataset_name(ds->ds_prev, namebuf); 2681 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2682 2683 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2684 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2685 2686 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2687 2688 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2689 dsl_dataset_zero_zil(ds, tx); 2690 2691 dsl_destroy_head_sync_impl(clone, tx); 2692 2693 dsl_dataset_rele(clone, FTAG); 2694 dsl_dataset_rele(ds, FTAG); 2695 } 2696 2697 /* 2698 * Rolls back the given filesystem or volume to the most recent snapshot. 2699 * The name of the most recent snapshot will be returned under key "target" 2700 * in the result nvlist. 2701 * 2702 * If owner != NULL: 2703 * - The existing dataset MUST be owned by the specified owner at entry 2704 * - Upon return, dataset will still be held by the same owner, whether we 2705 * succeed or not. 2706 * 2707 * This mode is required any time the existing filesystem is mounted. See 2708 * notes above zfs_suspend_fs() for further details. 2709 */ 2710 int 2711 dsl_dataset_rollback(const char *fsname, const char *tosnap, void *owner, 2712 nvlist_t *result) 2713 { 2714 dsl_dataset_rollback_arg_t ddra; 2715 2716 ddra.ddra_fsname = fsname; 2717 ddra.ddra_tosnap = tosnap; 2718 ddra.ddra_owner = owner; 2719 ddra.ddra_result = result; 2720 2721 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2722 dsl_dataset_rollback_sync, &ddra, 2723 1, ZFS_SPACE_CHECK_RESERVED)); 2724 } 2725 2726 struct promotenode { 2727 list_node_t link; 2728 dsl_dataset_t *ds; 2729 }; 2730 2731 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2732 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2733 void *tag); 2734 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2735 2736 int 2737 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2738 { 2739 dsl_dataset_promote_arg_t *ddpa = arg; 2740 dsl_pool_t *dp = dmu_tx_pool(tx); 2741 dsl_dataset_t *hds; 2742 struct promotenode *snap; 2743 dsl_dataset_t *origin_ds; 2744 int err; 2745 uint64_t unused; 2746 uint64_t ss_mv_cnt; 2747 size_t max_snap_len; 2748 boolean_t conflicting_snaps; 2749 2750 err = promote_hold(ddpa, dp, FTAG); 2751 if (err != 0) 2752 return (err); 2753 2754 hds = ddpa->ddpa_clone; 2755 snap = list_head(&ddpa->shared_snaps); 2756 origin_ds = snap->ds; 2757 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2758 2759 snap = list_head(&ddpa->origin_snaps); 2760 2761 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2762 promote_rele(ddpa, FTAG); 2763 return (SET_ERROR(EXDEV)); 2764 } 2765 2766 /* 2767 * Compute and check the amount of space to transfer. Since this is 2768 * so expensive, don't do the preliminary check. 2769 */ 2770 if (!dmu_tx_is_syncing(tx)) { 2771 promote_rele(ddpa, FTAG); 2772 return (0); 2773 } 2774 2775 /* compute origin's new unique space */ 2776 snap = list_tail(&ddpa->clone_snaps); 2777 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2778 origin_ds->ds_object); 2779 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2780 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2781 &ddpa->unique, &unused, &unused); 2782 2783 /* 2784 * Walk the snapshots that we are moving 2785 * 2786 * Compute space to transfer. Consider the incremental changes 2787 * to used by each snapshot: 2788 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2789 * So each snapshot gave birth to: 2790 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2791 * So a sequence would look like: 2792 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2793 * Which simplifies to: 2794 * uN + kN + kN-1 + ... + k1 + k0 2795 * Note however, if we stop before we reach the ORIGIN we get: 2796 * uN + kN + kN-1 + ... + kM - uM-1 2797 */ 2798 conflicting_snaps = B_FALSE; 2799 ss_mv_cnt = 0; 2800 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2801 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2802 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2803 for (snap = list_head(&ddpa->shared_snaps); snap; 2804 snap = list_next(&ddpa->shared_snaps, snap)) { 2805 uint64_t val, dlused, dlcomp, dluncomp; 2806 dsl_dataset_t *ds = snap->ds; 2807 2808 ss_mv_cnt++; 2809 2810 /* 2811 * If there are long holds, we won't be able to evict 2812 * the objset. 2813 */ 2814 if (dsl_dataset_long_held(ds)) { 2815 err = SET_ERROR(EBUSY); 2816 goto out; 2817 } 2818 2819 /* Check that the snapshot name does not conflict */ 2820 VERIFY0(dsl_dataset_get_snapname(ds)); 2821 if (strlen(ds->ds_snapname) >= max_snap_len) { 2822 err = SET_ERROR(ENAMETOOLONG); 2823 goto out; 2824 } 2825 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2826 if (err == 0) { 2827 fnvlist_add_boolean(ddpa->err_ds, 2828 snap->ds->ds_snapname); 2829 conflicting_snaps = B_TRUE; 2830 } else if (err != ENOENT) { 2831 goto out; 2832 } 2833 2834 /* The very first snapshot does not have a deadlist */ 2835 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2836 continue; 2837 2838 dsl_deadlist_space(&ds->ds_deadlist, 2839 &dlused, &dlcomp, &dluncomp); 2840 ddpa->used += dlused; 2841 ddpa->comp += dlcomp; 2842 ddpa->uncomp += dluncomp; 2843 } 2844 2845 /* 2846 * In order to return the full list of conflicting snapshots, we check 2847 * whether there was a conflict after traversing all of them. 2848 */ 2849 if (conflicting_snaps) { 2850 err = SET_ERROR(EEXIST); 2851 goto out; 2852 } 2853 2854 /* 2855 * If we are a clone of a clone then we never reached ORIGIN, 2856 * so we need to subtract out the clone origin's used space. 2857 */ 2858 if (ddpa->origin_origin) { 2859 ddpa->used -= 2860 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2861 ddpa->comp -= 2862 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2863 ddpa->uncomp -= 2864 dsl_dataset_phys(ddpa->origin_origin)-> 2865 ds_uncompressed_bytes; 2866 } 2867 2868 /* Check that there is enough space and limit headroom here */ 2869 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2870 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2871 if (err != 0) 2872 goto out; 2873 2874 /* 2875 * Compute the amounts of space that will be used by snapshots 2876 * after the promotion (for both origin and clone). For each, 2877 * it is the amount of space that will be on all of their 2878 * deadlists (that was not born before their new origin). 2879 */ 2880 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2881 uint64_t space; 2882 2883 /* 2884 * Note, typically this will not be a clone of a clone, 2885 * so dd_origin_txg will be < TXG_INITIAL, so 2886 * these snaplist_space() -> dsl_deadlist_space_range() 2887 * calls will be fast because they do not have to 2888 * iterate over all bps. 2889 */ 2890 snap = list_head(&ddpa->origin_snaps); 2891 err = snaplist_space(&ddpa->shared_snaps, 2892 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2893 if (err != 0) 2894 goto out; 2895 2896 err = snaplist_space(&ddpa->clone_snaps, 2897 snap->ds->ds_dir->dd_origin_txg, &space); 2898 if (err != 0) 2899 goto out; 2900 ddpa->cloneusedsnap += space; 2901 } 2902 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2903 DD_FLAG_USED_BREAKDOWN) { 2904 err = snaplist_space(&ddpa->origin_snaps, 2905 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2906 &ddpa->originusedsnap); 2907 if (err != 0) 2908 goto out; 2909 } 2910 2911 out: 2912 promote_rele(ddpa, FTAG); 2913 return (err); 2914 } 2915 2916 void 2917 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2918 { 2919 dsl_dataset_promote_arg_t *ddpa = arg; 2920 dsl_pool_t *dp = dmu_tx_pool(tx); 2921 dsl_dataset_t *hds; 2922 struct promotenode *snap; 2923 dsl_dataset_t *origin_ds; 2924 dsl_dataset_t *origin_head; 2925 dsl_dir_t *dd; 2926 dsl_dir_t *odd = NULL; 2927 uint64_t oldnext_obj; 2928 int64_t delta; 2929 2930 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2931 hds = ddpa->ddpa_clone; 2932 2933 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2934 2935 snap = list_head(&ddpa->shared_snaps); 2936 origin_ds = snap->ds; 2937 dd = hds->ds_dir; 2938 2939 snap = list_head(&ddpa->origin_snaps); 2940 origin_head = snap->ds; 2941 2942 /* 2943 * We need to explicitly open odd, since origin_ds's dd will be 2944 * changing. 2945 */ 2946 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2947 NULL, FTAG, &odd)); 2948 2949 /* change origin's next snap */ 2950 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2951 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2952 snap = list_tail(&ddpa->clone_snaps); 2953 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2954 origin_ds->ds_object); 2955 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2956 2957 /* change the origin's next clone */ 2958 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2959 dsl_dataset_remove_from_next_clones(origin_ds, 2960 snap->ds->ds_object, tx); 2961 VERIFY0(zap_add_int(dp->dp_meta_objset, 2962 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2963 oldnext_obj, tx)); 2964 } 2965 2966 /* change origin */ 2967 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2968 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2969 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2970 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2971 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2972 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2973 origin_head->ds_dir->dd_origin_txg = 2974 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2975 2976 /* change dd_clone entries */ 2977 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2978 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2979 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2980 VERIFY0(zap_add_int(dp->dp_meta_objset, 2981 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2982 hds->ds_object, tx)); 2983 2984 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2985 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2986 origin_head->ds_object, tx)); 2987 if (dsl_dir_phys(dd)->dd_clones == 0) { 2988 dsl_dir_phys(dd)->dd_clones = 2989 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2990 DMU_OT_NONE, 0, tx); 2991 } 2992 VERIFY0(zap_add_int(dp->dp_meta_objset, 2993 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2994 } 2995 2996 /* move snapshots to this dir */ 2997 for (snap = list_head(&ddpa->shared_snaps); snap; 2998 snap = list_next(&ddpa->shared_snaps, snap)) { 2999 dsl_dataset_t *ds = snap->ds; 3000 3001 /* 3002 * Property callbacks are registered to a particular 3003 * dsl_dir. Since ours is changing, evict the objset 3004 * so that they will be unregistered from the old dsl_dir. 3005 */ 3006 if (ds->ds_objset) { 3007 dmu_objset_evict(ds->ds_objset); 3008 ds->ds_objset = NULL; 3009 } 3010 3011 /* move snap name entry */ 3012 VERIFY0(dsl_dataset_get_snapname(ds)); 3013 VERIFY0(dsl_dataset_snap_remove(origin_head, 3014 ds->ds_snapname, tx, B_TRUE)); 3015 VERIFY0(zap_add(dp->dp_meta_objset, 3016 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 3017 8, 1, &ds->ds_object, tx)); 3018 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 3019 DD_FIELD_SNAPSHOT_COUNT, tx); 3020 3021 /* change containing dsl_dir */ 3022 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3023 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 3024 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 3025 ASSERT3P(ds->ds_dir, ==, odd); 3026 dsl_dir_rele(ds->ds_dir, ds); 3027 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 3028 NULL, ds, &ds->ds_dir)); 3029 3030 /* move any clone references */ 3031 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 3032 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 3033 zap_cursor_t zc; 3034 zap_attribute_t za; 3035 3036 for (zap_cursor_init(&zc, dp->dp_meta_objset, 3037 dsl_dataset_phys(ds)->ds_next_clones_obj); 3038 zap_cursor_retrieve(&zc, &za) == 0; 3039 zap_cursor_advance(&zc)) { 3040 dsl_dataset_t *cnds; 3041 uint64_t o; 3042 3043 if (za.za_first_integer == oldnext_obj) { 3044 /* 3045 * We've already moved the 3046 * origin's reference. 3047 */ 3048 continue; 3049 } 3050 3051 VERIFY0(dsl_dataset_hold_obj(dp, 3052 za.za_first_integer, FTAG, &cnds)); 3053 o = dsl_dir_phys(cnds->ds_dir)-> 3054 dd_head_dataset_obj; 3055 3056 VERIFY0(zap_remove_int(dp->dp_meta_objset, 3057 dsl_dir_phys(odd)->dd_clones, o, tx)); 3058 VERIFY0(zap_add_int(dp->dp_meta_objset, 3059 dsl_dir_phys(dd)->dd_clones, o, tx)); 3060 dsl_dataset_rele(cnds, FTAG); 3061 } 3062 zap_cursor_fini(&zc); 3063 } 3064 3065 ASSERT(!dsl_prop_hascb(ds)); 3066 } 3067 3068 /* 3069 * Change space accounting. 3070 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 3071 * both be valid, or both be 0 (resulting in delta == 0). This 3072 * is true for each of {clone,origin} independently. 3073 */ 3074 3075 delta = ddpa->cloneusedsnap - 3076 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 3077 ASSERT3S(delta, >=, 0); 3078 ASSERT3U(ddpa->used, >=, delta); 3079 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 3080 dsl_dir_diduse_space(dd, DD_USED_HEAD, 3081 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 3082 3083 delta = ddpa->originusedsnap - 3084 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 3085 ASSERT3S(delta, <=, 0); 3086 ASSERT3U(ddpa->used, >=, -delta); 3087 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 3088 dsl_dir_diduse_space(odd, DD_USED_HEAD, 3089 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 3090 3091 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 3092 3093 /* log history record */ 3094 spa_history_log_internal_ds(hds, "promote", tx, ""); 3095 3096 dsl_dir_rele(odd, FTAG); 3097 promote_rele(ddpa, FTAG); 3098 } 3099 3100 /* 3101 * Make a list of dsl_dataset_t's for the snapshots between first_obj 3102 * (exclusive) and last_obj (inclusive). The list will be in reverse 3103 * order (last_obj will be the list_head()). If first_obj == 0, do all 3104 * snapshots back to this dataset's origin. 3105 */ 3106 static int 3107 snaplist_make(dsl_pool_t *dp, 3108 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 3109 { 3110 uint64_t obj = last_obj; 3111 3112 list_create(l, sizeof (struct promotenode), 3113 offsetof(struct promotenode, link)); 3114 3115 while (obj != first_obj) { 3116 dsl_dataset_t *ds; 3117 struct promotenode *snap; 3118 int err; 3119 3120 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 3121 ASSERT(err != ENOENT); 3122 if (err != 0) 3123 return (err); 3124 3125 if (first_obj == 0) 3126 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 3127 3128 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 3129 snap->ds = ds; 3130 list_insert_tail(l, snap); 3131 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3132 } 3133 3134 return (0); 3135 } 3136 3137 static int 3138 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 3139 { 3140 struct promotenode *snap; 3141 3142 *spacep = 0; 3143 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 3144 uint64_t used, comp, uncomp; 3145 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 3146 mintxg, UINT64_MAX, &used, &comp, &uncomp); 3147 *spacep += used; 3148 } 3149 return (0); 3150 } 3151 3152 static void 3153 snaplist_destroy(list_t *l, void *tag) 3154 { 3155 struct promotenode *snap; 3156 3157 if (l == NULL || !list_link_active(&l->list_head)) 3158 return; 3159 3160 while ((snap = list_tail(l)) != NULL) { 3161 list_remove(l, snap); 3162 dsl_dataset_rele(snap->ds, tag); 3163 kmem_free(snap, sizeof (*snap)); 3164 } 3165 list_destroy(l); 3166 } 3167 3168 static int 3169 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 3170 { 3171 int error; 3172 dsl_dir_t *dd; 3173 struct promotenode *snap; 3174 3175 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 3176 &ddpa->ddpa_clone); 3177 if (error != 0) 3178 return (error); 3179 dd = ddpa->ddpa_clone->ds_dir; 3180 3181 if (ddpa->ddpa_clone->ds_is_snapshot || 3182 !dsl_dir_is_clone(dd)) { 3183 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3184 return (SET_ERROR(EINVAL)); 3185 } 3186 3187 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 3188 &ddpa->shared_snaps, tag); 3189 if (error != 0) 3190 goto out; 3191 3192 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 3193 &ddpa->clone_snaps, tag); 3194 if (error != 0) 3195 goto out; 3196 3197 snap = list_head(&ddpa->shared_snaps); 3198 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 3199 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 3200 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 3201 &ddpa->origin_snaps, tag); 3202 if (error != 0) 3203 goto out; 3204 3205 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 3206 error = dsl_dataset_hold_obj(dp, 3207 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 3208 tag, &ddpa->origin_origin); 3209 if (error != 0) 3210 goto out; 3211 } 3212 out: 3213 if (error != 0) 3214 promote_rele(ddpa, tag); 3215 return (error); 3216 } 3217 3218 static void 3219 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 3220 { 3221 snaplist_destroy(&ddpa->shared_snaps, tag); 3222 snaplist_destroy(&ddpa->clone_snaps, tag); 3223 snaplist_destroy(&ddpa->origin_snaps, tag); 3224 if (ddpa->origin_origin != NULL) 3225 dsl_dataset_rele(ddpa->origin_origin, tag); 3226 dsl_dataset_rele(ddpa->ddpa_clone, tag); 3227 } 3228 3229 /* 3230 * Promote a clone. 3231 * 3232 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 3233 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 3234 */ 3235 int 3236 dsl_dataset_promote(const char *name, char *conflsnap) 3237 { 3238 dsl_dataset_promote_arg_t ddpa = { 0 }; 3239 uint64_t numsnaps; 3240 int error; 3241 nvpair_t *snap_pair; 3242 objset_t *os; 3243 3244 /* 3245 * We will modify space proportional to the number of 3246 * snapshots. Compute numsnaps. 3247 */ 3248 error = dmu_objset_hold(name, FTAG, &os); 3249 if (error != 0) 3250 return (error); 3251 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 3252 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 3253 &numsnaps); 3254 dmu_objset_rele(os, FTAG); 3255 if (error != 0) 3256 return (error); 3257 3258 ddpa.ddpa_clonename = name; 3259 ddpa.err_ds = fnvlist_alloc(); 3260 ddpa.cr = CRED(); 3261 3262 error = dsl_sync_task(name, dsl_dataset_promote_check, 3263 dsl_dataset_promote_sync, &ddpa, 3264 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED); 3265 3266 /* 3267 * Return the first conflicting snapshot found. 3268 */ 3269 snap_pair = nvlist_next_nvpair(ddpa.err_ds, NULL); 3270 if (snap_pair != NULL && conflsnap != NULL) 3271 (void) strcpy(conflsnap, nvpair_name(snap_pair)); 3272 3273 fnvlist_free(ddpa.err_ds); 3274 return (error); 3275 } 3276 3277 int 3278 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3279 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3280 { 3281 /* 3282 * "slack" factor for received datasets with refquota set on them. 3283 * See the bottom of this function for details on its use. 3284 */ 3285 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 3286 int64_t unused_refres_delta; 3287 3288 /* they should both be heads */ 3289 if (clone->ds_is_snapshot || 3290 origin_head->ds_is_snapshot) 3291 return (SET_ERROR(EINVAL)); 3292 3293 /* if we are not forcing, the branch point should be just before them */ 3294 if (!force && clone->ds_prev != origin_head->ds_prev) 3295 return (SET_ERROR(EINVAL)); 3296 3297 /* clone should be the clone (unless they are unrelated) */ 3298 if (clone->ds_prev != NULL && 3299 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3300 origin_head->ds_dir != clone->ds_prev->ds_dir) 3301 return (SET_ERROR(EINVAL)); 3302 3303 /* the clone should be a child of the origin */ 3304 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3305 return (SET_ERROR(EINVAL)); 3306 3307 /* origin_head shouldn't be modified unless 'force' */ 3308 if (!force && 3309 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3310 return (SET_ERROR(ETXTBSY)); 3311 3312 /* origin_head should have no long holds (e.g. is not mounted) */ 3313 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3314 return (SET_ERROR(EBUSY)); 3315 3316 /* check amount of any unconsumed refreservation */ 3317 unused_refres_delta = 3318 (int64_t)MIN(origin_head->ds_reserved, 3319 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3320 (int64_t)MIN(origin_head->ds_reserved, 3321 dsl_dataset_phys(clone)->ds_unique_bytes); 3322 3323 if (unused_refres_delta > 0 && 3324 unused_refres_delta > 3325 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3326 return (SET_ERROR(ENOSPC)); 3327 3328 /* 3329 * The clone can't be too much over the head's refquota. 3330 * 3331 * To ensure that the entire refquota can be used, we allow one 3332 * transaction to exceed the the refquota. Therefore, this check 3333 * needs to also allow for the space referenced to be more than the 3334 * refquota. The maximum amount of space that one transaction can use 3335 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3336 * overage ensures that we are able to receive a filesystem that 3337 * exceeds the refquota on the source system. 3338 * 3339 * So that overage is the refquota_slack we use below. 3340 */ 3341 if (origin_head->ds_quota != 0 && 3342 dsl_dataset_phys(clone)->ds_referenced_bytes > 3343 origin_head->ds_quota + refquota_slack) 3344 return (SET_ERROR(EDQUOT)); 3345 3346 return (0); 3347 } 3348 3349 static void 3350 dsl_dataset_swap_remap_deadlists(dsl_dataset_t *clone, 3351 dsl_dataset_t *origin, dmu_tx_t *tx) 3352 { 3353 uint64_t clone_remap_dl_obj, origin_remap_dl_obj; 3354 dsl_pool_t *dp = dmu_tx_pool(tx); 3355 3356 ASSERT(dsl_pool_sync_context(dp)); 3357 3358 clone_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(clone); 3359 origin_remap_dl_obj = dsl_dataset_get_remap_deadlist_object(origin); 3360 3361 if (clone_remap_dl_obj != 0) { 3362 dsl_deadlist_close(&clone->ds_remap_deadlist); 3363 dsl_dataset_unset_remap_deadlist_object(clone, tx); 3364 } 3365 if (origin_remap_dl_obj != 0) { 3366 dsl_deadlist_close(&origin->ds_remap_deadlist); 3367 dsl_dataset_unset_remap_deadlist_object(origin, tx); 3368 } 3369 3370 if (clone_remap_dl_obj != 0) { 3371 dsl_dataset_set_remap_deadlist_object(origin, 3372 clone_remap_dl_obj, tx); 3373 dsl_deadlist_open(&origin->ds_remap_deadlist, 3374 dp->dp_meta_objset, clone_remap_dl_obj); 3375 } 3376 if (origin_remap_dl_obj != 0) { 3377 dsl_dataset_set_remap_deadlist_object(clone, 3378 origin_remap_dl_obj, tx); 3379 dsl_deadlist_open(&clone->ds_remap_deadlist, 3380 dp->dp_meta_objset, origin_remap_dl_obj); 3381 } 3382 } 3383 3384 void 3385 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 3386 dsl_dataset_t *origin_head, dmu_tx_t *tx) 3387 { 3388 dsl_pool_t *dp = dmu_tx_pool(tx); 3389 int64_t unused_refres_delta; 3390 3391 ASSERT(clone->ds_reserved == 0); 3392 /* 3393 * NOTE: On DEBUG kernels there could be a race between this and 3394 * the check function if spa_asize_inflation is adjusted... 3395 */ 3396 ASSERT(origin_head->ds_quota == 0 || 3397 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 3398 DMU_MAX_ACCESS * spa_asize_inflation); 3399 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 3400 3401 /* 3402 * Swap per-dataset feature flags. 3403 */ 3404 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 3405 if (!(spa_feature_table[f].fi_flags & 3406 ZFEATURE_FLAG_PER_DATASET)) { 3407 ASSERT(!clone->ds_feature_inuse[f]); 3408 ASSERT(!origin_head->ds_feature_inuse[f]); 3409 continue; 3410 } 3411 3412 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3413 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3414 3415 if (clone_inuse) { 3416 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3417 clone->ds_feature_inuse[f] = B_FALSE; 3418 } 3419 if (origin_head_inuse) { 3420 dsl_dataset_deactivate_feature(origin_head->ds_object, 3421 f, tx); 3422 origin_head->ds_feature_inuse[f] = B_FALSE; 3423 } 3424 if (clone_inuse) { 3425 dsl_dataset_activate_feature(origin_head->ds_object, 3426 f, tx); 3427 origin_head->ds_feature_inuse[f] = B_TRUE; 3428 } 3429 if (origin_head_inuse) { 3430 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3431 clone->ds_feature_inuse[f] = B_TRUE; 3432 } 3433 } 3434 3435 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3436 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3437 3438 if (clone->ds_objset != NULL) { 3439 dmu_objset_evict(clone->ds_objset); 3440 clone->ds_objset = NULL; 3441 } 3442 3443 if (origin_head->ds_objset != NULL) { 3444 dmu_objset_evict(origin_head->ds_objset); 3445 origin_head->ds_objset = NULL; 3446 } 3447 3448 unused_refres_delta = 3449 (int64_t)MIN(origin_head->ds_reserved, 3450 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3451 (int64_t)MIN(origin_head->ds_reserved, 3452 dsl_dataset_phys(clone)->ds_unique_bytes); 3453 3454 /* 3455 * Reset origin's unique bytes, if it exists. 3456 */ 3457 if (clone->ds_prev) { 3458 dsl_dataset_t *origin = clone->ds_prev; 3459 uint64_t comp, uncomp; 3460 3461 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3462 dsl_deadlist_space_range(&clone->ds_deadlist, 3463 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3464 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3465 } 3466 3467 /* swap blkptrs */ 3468 { 3469 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 3470 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 3471 blkptr_t tmp; 3472 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3473 dsl_dataset_phys(origin_head)->ds_bp = 3474 dsl_dataset_phys(clone)->ds_bp; 3475 dsl_dataset_phys(clone)->ds_bp = tmp; 3476 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 3477 rrw_exit(&clone->ds_bp_rwlock, FTAG); 3478 } 3479 3480 /* set dd_*_bytes */ 3481 { 3482 int64_t dused, dcomp, duncomp; 3483 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3484 uint64_t odl_used, odl_comp, odl_uncomp; 3485 3486 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3487 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3488 3489 dsl_deadlist_space(&clone->ds_deadlist, 3490 &cdl_used, &cdl_comp, &cdl_uncomp); 3491 dsl_deadlist_space(&origin_head->ds_deadlist, 3492 &odl_used, &odl_comp, &odl_uncomp); 3493 3494 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3495 cdl_used - 3496 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3497 odl_used); 3498 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3499 cdl_comp - 3500 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3501 odl_comp); 3502 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3503 cdl_uncomp - 3504 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3505 odl_uncomp); 3506 3507 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3508 dused, dcomp, duncomp, tx); 3509 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3510 -dused, -dcomp, -duncomp, tx); 3511 3512 /* 3513 * The difference in the space used by snapshots is the 3514 * difference in snapshot space due to the head's 3515 * deadlist (since that's the only thing that's 3516 * changing that affects the snapused). 3517 */ 3518 dsl_deadlist_space_range(&clone->ds_deadlist, 3519 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3520 &cdl_used, &cdl_comp, &cdl_uncomp); 3521 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3522 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3523 &odl_used, &odl_comp, &odl_uncomp); 3524 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3525 DD_USED_HEAD, DD_USED_SNAP, tx); 3526 } 3527 3528 /* swap ds_*_bytes */ 3529 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3530 dsl_dataset_phys(clone)->ds_referenced_bytes); 3531 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3532 dsl_dataset_phys(clone)->ds_compressed_bytes); 3533 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3534 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3535 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3536 dsl_dataset_phys(clone)->ds_unique_bytes); 3537 3538 /* apply any parent delta for change in unconsumed refreservation */ 3539 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3540 unused_refres_delta, 0, 0, tx); 3541 3542 /* 3543 * Swap deadlists. 3544 */ 3545 dsl_deadlist_close(&clone->ds_deadlist); 3546 dsl_deadlist_close(&origin_head->ds_deadlist); 3547 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3548 dsl_dataset_phys(clone)->ds_deadlist_obj); 3549 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3550 dsl_dataset_phys(clone)->ds_deadlist_obj); 3551 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3552 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3553 dsl_dataset_swap_remap_deadlists(clone, origin_head, tx); 3554 3555 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3556 3557 spa_history_log_internal_ds(clone, "clone swap", tx, 3558 "parent=%s", origin_head->ds_dir->dd_myname); 3559 } 3560 3561 /* 3562 * Given a pool name and a dataset object number in that pool, 3563 * return the name of that dataset. 3564 */ 3565 int 3566 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3567 { 3568 dsl_pool_t *dp; 3569 dsl_dataset_t *ds; 3570 int error; 3571 3572 error = dsl_pool_hold(pname, FTAG, &dp); 3573 if (error != 0) 3574 return (error); 3575 3576 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3577 if (error == 0) { 3578 dsl_dataset_name(ds, buf); 3579 dsl_dataset_rele(ds, FTAG); 3580 } 3581 dsl_pool_rele(dp, FTAG); 3582 3583 return (error); 3584 } 3585 3586 int 3587 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3588 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3589 { 3590 int error = 0; 3591 3592 ASSERT3S(asize, >, 0); 3593 3594 /* 3595 * *ref_rsrv is the portion of asize that will come from any 3596 * unconsumed refreservation space. 3597 */ 3598 *ref_rsrv = 0; 3599 3600 mutex_enter(&ds->ds_lock); 3601 /* 3602 * Make a space adjustment for reserved bytes. 3603 */ 3604 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3605 ASSERT3U(*used, >=, 3606 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3607 *used -= 3608 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3609 *ref_rsrv = 3610 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3611 } 3612 3613 if (!check_quota || ds->ds_quota == 0) { 3614 mutex_exit(&ds->ds_lock); 3615 return (0); 3616 } 3617 /* 3618 * If they are requesting more space, and our current estimate 3619 * is over quota, they get to try again unless the actual 3620 * on-disk is over quota and there are no pending changes (which 3621 * may free up space for us). 3622 */ 3623 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3624 ds->ds_quota) { 3625 if (inflight > 0 || 3626 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3627 error = SET_ERROR(ERESTART); 3628 else 3629 error = SET_ERROR(EDQUOT); 3630 } 3631 mutex_exit(&ds->ds_lock); 3632 3633 return (error); 3634 } 3635 3636 typedef struct dsl_dataset_set_qr_arg { 3637 const char *ddsqra_name; 3638 zprop_source_t ddsqra_source; 3639 uint64_t ddsqra_value; 3640 } dsl_dataset_set_qr_arg_t; 3641 3642 3643 /* ARGSUSED */ 3644 static int 3645 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3646 { 3647 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3648 dsl_pool_t *dp = dmu_tx_pool(tx); 3649 dsl_dataset_t *ds; 3650 int error; 3651 uint64_t newval; 3652 3653 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3654 return (SET_ERROR(ENOTSUP)); 3655 3656 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3657 if (error != 0) 3658 return (error); 3659 3660 if (ds->ds_is_snapshot) { 3661 dsl_dataset_rele(ds, FTAG); 3662 return (SET_ERROR(EINVAL)); 3663 } 3664 3665 error = dsl_prop_predict(ds->ds_dir, 3666 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3667 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3668 if (error != 0) { 3669 dsl_dataset_rele(ds, FTAG); 3670 return (error); 3671 } 3672 3673 if (newval == 0) { 3674 dsl_dataset_rele(ds, FTAG); 3675 return (0); 3676 } 3677 3678 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3679 newval < ds->ds_reserved) { 3680 dsl_dataset_rele(ds, FTAG); 3681 return (SET_ERROR(ENOSPC)); 3682 } 3683 3684 dsl_dataset_rele(ds, FTAG); 3685 return (0); 3686 } 3687 3688 static void 3689 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3690 { 3691 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3692 dsl_pool_t *dp = dmu_tx_pool(tx); 3693 dsl_dataset_t *ds; 3694 uint64_t newval; 3695 3696 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3697 3698 dsl_prop_set_sync_impl(ds, 3699 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3700 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3701 &ddsqra->ddsqra_value, tx); 3702 3703 VERIFY0(dsl_prop_get_int_ds(ds, 3704 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3705 3706 if (ds->ds_quota != newval) { 3707 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3708 ds->ds_quota = newval; 3709 } 3710 dsl_dataset_rele(ds, FTAG); 3711 } 3712 3713 int 3714 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3715 uint64_t refquota) 3716 { 3717 dsl_dataset_set_qr_arg_t ddsqra; 3718 3719 ddsqra.ddsqra_name = dsname; 3720 ddsqra.ddsqra_source = source; 3721 ddsqra.ddsqra_value = refquota; 3722 3723 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3724 dsl_dataset_set_refquota_sync, &ddsqra, 0, 3725 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 3726 } 3727 3728 static int 3729 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3730 { 3731 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3732 dsl_pool_t *dp = dmu_tx_pool(tx); 3733 dsl_dataset_t *ds; 3734 int error; 3735 uint64_t newval, unique; 3736 3737 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3738 return (SET_ERROR(ENOTSUP)); 3739 3740 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3741 if (error != 0) 3742 return (error); 3743 3744 if (ds->ds_is_snapshot) { 3745 dsl_dataset_rele(ds, FTAG); 3746 return (SET_ERROR(EINVAL)); 3747 } 3748 3749 error = dsl_prop_predict(ds->ds_dir, 3750 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3751 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3752 if (error != 0) { 3753 dsl_dataset_rele(ds, FTAG); 3754 return (error); 3755 } 3756 3757 /* 3758 * If we are doing the preliminary check in open context, the 3759 * space estimates may be inaccurate. 3760 */ 3761 if (!dmu_tx_is_syncing(tx)) { 3762 dsl_dataset_rele(ds, FTAG); 3763 return (0); 3764 } 3765 3766 mutex_enter(&ds->ds_lock); 3767 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3768 dsl_dataset_recalc_head_uniq(ds); 3769 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3770 mutex_exit(&ds->ds_lock); 3771 3772 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3773 uint64_t delta = MAX(unique, newval) - 3774 MAX(unique, ds->ds_reserved); 3775 3776 if (delta > 3777 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3778 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3779 dsl_dataset_rele(ds, FTAG); 3780 return (SET_ERROR(ENOSPC)); 3781 } 3782 } 3783 3784 dsl_dataset_rele(ds, FTAG); 3785 return (0); 3786 } 3787 3788 void 3789 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3790 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3791 { 3792 uint64_t newval; 3793 uint64_t unique; 3794 int64_t delta; 3795 3796 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3797 source, sizeof (value), 1, &value, tx); 3798 3799 VERIFY0(dsl_prop_get_int_ds(ds, 3800 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3801 3802 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3803 mutex_enter(&ds->ds_dir->dd_lock); 3804 mutex_enter(&ds->ds_lock); 3805 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3806 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3807 delta = MAX(0, (int64_t)(newval - unique)) - 3808 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3809 ds->ds_reserved = newval; 3810 mutex_exit(&ds->ds_lock); 3811 3812 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3813 mutex_exit(&ds->ds_dir->dd_lock); 3814 } 3815 3816 static void 3817 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3818 { 3819 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3820 dsl_pool_t *dp = dmu_tx_pool(tx); 3821 dsl_dataset_t *ds; 3822 3823 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3824 dsl_dataset_set_refreservation_sync_impl(ds, 3825 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3826 dsl_dataset_rele(ds, FTAG); 3827 } 3828 3829 int 3830 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3831 uint64_t refreservation) 3832 { 3833 dsl_dataset_set_qr_arg_t ddsqra; 3834 3835 ddsqra.ddsqra_name = dsname; 3836 ddsqra.ddsqra_source = source; 3837 ddsqra.ddsqra_value = refreservation; 3838 3839 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3840 dsl_dataset_set_refreservation_sync, &ddsqra, 0, 3841 ZFS_SPACE_CHECK_EXTRA_RESERVED)); 3842 } 3843 3844 /* 3845 * Return (in *usedp) the amount of space written in new that is not 3846 * present in oldsnap. New may be a snapshot or the head. Old must be 3847 * a snapshot before new, in new's filesystem (or its origin). If not then 3848 * fail and return EINVAL. 3849 * 3850 * The written space is calculated by considering two components: First, we 3851 * ignore any freed space, and calculate the written as new's used space 3852 * minus old's used space. Next, we add in the amount of space that was freed 3853 * between the two snapshots, thus reducing new's used space relative to old's. 3854 * Specifically, this is the space that was born before old->ds_creation_txg, 3855 * and freed before new (ie. on new's deadlist or a previous deadlist). 3856 * 3857 * space freed [---------------------] 3858 * snapshots ---O-------O--------O-------O------ 3859 * oldsnap new 3860 */ 3861 int 3862 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3863 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3864 { 3865 int err = 0; 3866 uint64_t snapobj; 3867 dsl_pool_t *dp = new->ds_dir->dd_pool; 3868 3869 ASSERT(dsl_pool_config_held(dp)); 3870 3871 *usedp = 0; 3872 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3873 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3874 3875 *compp = 0; 3876 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3877 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3878 3879 *uncompp = 0; 3880 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3881 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3882 3883 snapobj = new->ds_object; 3884 while (snapobj != oldsnap->ds_object) { 3885 dsl_dataset_t *snap; 3886 uint64_t used, comp, uncomp; 3887 3888 if (snapobj == new->ds_object) { 3889 snap = new; 3890 } else { 3891 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3892 if (err != 0) 3893 break; 3894 } 3895 3896 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3897 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3898 /* 3899 * The blocks in the deadlist can not be born after 3900 * ds_prev_snap_txg, so get the whole deadlist space, 3901 * which is more efficient (especially for old-format 3902 * deadlists). Unfortunately the deadlist code 3903 * doesn't have enough information to make this 3904 * optimization itself. 3905 */ 3906 dsl_deadlist_space(&snap->ds_deadlist, 3907 &used, &comp, &uncomp); 3908 } else { 3909 dsl_deadlist_space_range(&snap->ds_deadlist, 3910 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3911 &used, &comp, &uncomp); 3912 } 3913 *usedp += used; 3914 *compp += comp; 3915 *uncompp += uncomp; 3916 3917 /* 3918 * If we get to the beginning of the chain of snapshots 3919 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3920 * was not a snapshot of/before new. 3921 */ 3922 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3923 if (snap != new) 3924 dsl_dataset_rele(snap, FTAG); 3925 if (snapobj == 0) { 3926 err = SET_ERROR(EINVAL); 3927 break; 3928 } 3929 3930 } 3931 return (err); 3932 } 3933 3934 /* 3935 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3936 * lastsnap, and all snapshots in between are deleted. 3937 * 3938 * blocks that would be freed [---------------------------] 3939 * snapshots ---O-------O--------O-------O--------O 3940 * firstsnap lastsnap 3941 * 3942 * This is the set of blocks that were born after the snap before firstsnap, 3943 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3944 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3945 * We calculate this by iterating over the relevant deadlists (from the snap 3946 * after lastsnap, backward to the snap after firstsnap), summing up the 3947 * space on the deadlist that was born after the snap before firstsnap. 3948 */ 3949 int 3950 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3951 dsl_dataset_t *lastsnap, 3952 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3953 { 3954 int err = 0; 3955 uint64_t snapobj; 3956 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3957 3958 ASSERT(firstsnap->ds_is_snapshot); 3959 ASSERT(lastsnap->ds_is_snapshot); 3960 3961 /* 3962 * Check that the snapshots are in the same dsl_dir, and firstsnap 3963 * is before lastsnap. 3964 */ 3965 if (firstsnap->ds_dir != lastsnap->ds_dir || 3966 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3967 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3968 return (SET_ERROR(EINVAL)); 3969 3970 *usedp = *compp = *uncompp = 0; 3971 3972 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3973 while (snapobj != firstsnap->ds_object) { 3974 dsl_dataset_t *ds; 3975 uint64_t used, comp, uncomp; 3976 3977 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3978 if (err != 0) 3979 break; 3980 3981 dsl_deadlist_space_range(&ds->ds_deadlist, 3982 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3983 &used, &comp, &uncomp); 3984 *usedp += used; 3985 *compp += comp; 3986 *uncompp += uncomp; 3987 3988 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3989 ASSERT3U(snapobj, !=, 0); 3990 dsl_dataset_rele(ds, FTAG); 3991 } 3992 return (err); 3993 } 3994 3995 /* 3996 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3997 * For example, they could both be snapshots of the same filesystem, and 3998 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3999 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 4000 * filesystem. Or 'earlier' could be the origin's origin. 4001 * 4002 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 4003 */ 4004 boolean_t 4005 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 4006 uint64_t earlier_txg) 4007 { 4008 dsl_pool_t *dp = later->ds_dir->dd_pool; 4009 int error; 4010 boolean_t ret; 4011 4012 ASSERT(dsl_pool_config_held(dp)); 4013 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 4014 4015 if (earlier_txg == 0) 4016 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 4017 4018 if (later->ds_is_snapshot && 4019 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 4020 return (B_FALSE); 4021 4022 if (later->ds_dir == earlier->ds_dir) 4023 return (B_TRUE); 4024 if (!dsl_dir_is_clone(later->ds_dir)) 4025 return (B_FALSE); 4026 4027 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 4028 return (B_TRUE); 4029 dsl_dataset_t *origin; 4030 error = dsl_dataset_hold_obj(dp, 4031 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 4032 if (error != 0) 4033 return (B_FALSE); 4034 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 4035 dsl_dataset_rele(origin, FTAG); 4036 return (ret); 4037 } 4038 4039 void 4040 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 4041 { 4042 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 4043 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 4044 } 4045 4046 boolean_t 4047 dsl_dataset_is_zapified(dsl_dataset_t *ds) 4048 { 4049 dmu_object_info_t doi; 4050 4051 dmu_object_info_from_db(ds->ds_dbuf, &doi); 4052 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 4053 } 4054 4055 boolean_t 4056 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 4057 { 4058 return (dsl_dataset_is_zapified(ds) && 4059 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 4060 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 4061 } 4062 4063 uint64_t 4064 dsl_dataset_get_remap_deadlist_object(dsl_dataset_t *ds) 4065 { 4066 uint64_t remap_deadlist_obj; 4067 int err; 4068 4069 if (!dsl_dataset_is_zapified(ds)) 4070 return (0); 4071 4072 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4073 DS_FIELD_REMAP_DEADLIST, sizeof (remap_deadlist_obj), 1, 4074 &remap_deadlist_obj); 4075 4076 if (err != 0) { 4077 VERIFY3S(err, ==, ENOENT); 4078 return (0); 4079 } 4080 4081 ASSERT(remap_deadlist_obj != 0); 4082 return (remap_deadlist_obj); 4083 } 4084 4085 boolean_t 4086 dsl_dataset_remap_deadlist_exists(dsl_dataset_t *ds) 4087 { 4088 EQUIV(dsl_deadlist_is_open(&ds->ds_remap_deadlist), 4089 dsl_dataset_get_remap_deadlist_object(ds) != 0); 4090 return (dsl_deadlist_is_open(&ds->ds_remap_deadlist)); 4091 } 4092 4093 static void 4094 dsl_dataset_set_remap_deadlist_object(dsl_dataset_t *ds, uint64_t obj, 4095 dmu_tx_t *tx) 4096 { 4097 ASSERT(obj != 0); 4098 dsl_dataset_zapify(ds, tx); 4099 VERIFY0(zap_add(ds->ds_dir->dd_pool->dp_meta_objset, ds->ds_object, 4100 DS_FIELD_REMAP_DEADLIST, sizeof (obj), 1, &obj, tx)); 4101 } 4102 4103 static void 4104 dsl_dataset_unset_remap_deadlist_object(dsl_dataset_t *ds, dmu_tx_t *tx) 4105 { 4106 VERIFY0(zap_remove(ds->ds_dir->dd_pool->dp_meta_objset, 4107 ds->ds_object, DS_FIELD_REMAP_DEADLIST, tx)); 4108 } 4109 4110 void 4111 dsl_dataset_destroy_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4112 { 4113 uint64_t remap_deadlist_object; 4114 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4115 4116 ASSERT(dmu_tx_is_syncing(tx)); 4117 ASSERT(dsl_dataset_remap_deadlist_exists(ds)); 4118 4119 remap_deadlist_object = ds->ds_remap_deadlist.dl_object; 4120 dsl_deadlist_close(&ds->ds_remap_deadlist); 4121 dsl_deadlist_free(spa_meta_objset(spa), remap_deadlist_object, tx); 4122 dsl_dataset_unset_remap_deadlist_object(ds, tx); 4123 spa_feature_decr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4124 } 4125 4126 void 4127 dsl_dataset_create_remap_deadlist(dsl_dataset_t *ds, dmu_tx_t *tx) 4128 { 4129 uint64_t remap_deadlist_obj; 4130 spa_t *spa = ds->ds_dir->dd_pool->dp_spa; 4131 4132 ASSERT(dmu_tx_is_syncing(tx)); 4133 ASSERT(MUTEX_HELD(&ds->ds_remap_deadlist_lock)); 4134 /* 4135 * Currently we only create remap deadlists when there are indirect 4136 * vdevs with referenced mappings. 4137 */ 4138 ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REMOVAL)); 4139 4140 remap_deadlist_obj = dsl_deadlist_clone( 4141 &ds->ds_deadlist, UINT64_MAX, 4142 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 4143 dsl_dataset_set_remap_deadlist_object(ds, 4144 remap_deadlist_obj, tx); 4145 dsl_deadlist_open(&ds->ds_remap_deadlist, spa_meta_objset(spa), 4146 remap_deadlist_obj); 4147 spa_feature_incr(spa, SPA_FEATURE_OBSOLETE_COUNTS, tx); 4148 } 4149