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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Portions Copyright (c) 2011 Martin Matuska <mm (at) FreeBSD.org> 24 * Copyright (c) 2011, 2016 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 */ 31 32 #include <sys/dmu_objset.h> 33 #include <sys/dsl_dataset.h> 34 #include <sys/dsl_dir.h> 35 #include <sys/dsl_prop.h> 36 #include <sys/dsl_synctask.h> 37 #include <sys/dmu_traverse.h> 38 #include <sys/dmu_impl.h> 39 #include <sys/dmu_send.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/zfs_znode.h> 50 #include <sys/zfs_onexit.h> 51 #include <sys/zvol.h> 52 #include <sys/dsl_scan.h> 53 #include <sys/dsl_deadlist.h> 54 #include <sys/dsl_destroy.h> 55 #include <sys/dsl_userhold.h> 56 #include <sys/dsl_bookmark.h> 57 #include <sys/dmu_send.h> 58 #include <sys/zio_checksum.h> 59 #include <sys/zio_compress.h> 60 #include <zfs_fletcher.h> 61 62 SYSCTL_DECL(_vfs_zfs); 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 SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 75 &zfs_max_recordsize, 0, 76 "Maximum block size. Expect dragons when tuning this."); 77 78 #define SWITCH64(x, y) \ 79 { \ 80 uint64_t __tmp = (x); \ 81 (x) = (y); \ 82 (y) = __tmp; \ 83 } 84 85 #define DS_REF_MAX (1ULL << 62) 86 87 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 88 89 extern int spa_asize_inflation; 90 91 static zil_header_t zero_zil; 92 93 /* 94 * Figure out how much of this delta should be propogated to the dsl_dir 95 * layer. If there's a refreservation, that space has already been 96 * partially accounted for in our ancestors. 97 */ 98 static int64_t 99 parent_delta(dsl_dataset_t *ds, int64_t delta) 100 { 101 dsl_dataset_phys_t *ds_phys; 102 uint64_t old_bytes, new_bytes; 103 104 if (ds->ds_reserved == 0) 105 return (delta); 106 107 ds_phys = dsl_dataset_phys(ds); 108 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 109 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 110 111 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 112 return (new_bytes - old_bytes); 113 } 114 115 void 116 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 117 { 118 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 119 int compressed = BP_GET_PSIZE(bp); 120 int uncompressed = BP_GET_UCSIZE(bp); 121 int64_t delta; 122 123 dprintf_bp(bp, "ds=%p", ds); 124 125 ASSERT(dmu_tx_is_syncing(tx)); 126 /* It could have been compressed away to nothing */ 127 if (BP_IS_HOLE(bp)) 128 return; 129 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 130 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 131 if (ds == NULL) { 132 dsl_pool_mos_diduse_space(tx->tx_pool, 133 used, compressed, uncompressed); 134 return; 135 } 136 137 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 138 dmu_buf_will_dirty(ds->ds_dbuf, tx); 139 mutex_enter(&ds->ds_lock); 140 delta = parent_delta(ds, used); 141 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 142 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 143 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 144 dsl_dataset_phys(ds)->ds_unique_bytes += used; 145 146 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 147 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 148 B_TRUE; 149 } 150 151 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 152 if (f != SPA_FEATURE_NONE) 153 ds->ds_feature_activation_needed[f] = B_TRUE; 154 155 mutex_exit(&ds->ds_lock); 156 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 157 compressed, uncompressed, tx); 158 dsl_dir_transfer_space(ds->ds_dir, used - delta, 159 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 160 } 161 162 int 163 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 164 boolean_t async) 165 { 166 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 167 int compressed = BP_GET_PSIZE(bp); 168 int uncompressed = BP_GET_UCSIZE(bp); 169 170 if (BP_IS_HOLE(bp)) 171 return (0); 172 173 ASSERT(dmu_tx_is_syncing(tx)); 174 ASSERT(bp->blk_birth <= tx->tx_txg); 175 176 if (ds == NULL) { 177 dsl_free(tx->tx_pool, tx->tx_txg, bp); 178 dsl_pool_mos_diduse_space(tx->tx_pool, 179 -used, -compressed, -uncompressed); 180 return (used); 181 } 182 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 183 184 ASSERT(!ds->ds_is_snapshot); 185 dmu_buf_will_dirty(ds->ds_dbuf, tx); 186 187 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 188 int64_t delta; 189 190 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 191 dsl_free(tx->tx_pool, tx->tx_txg, bp); 192 193 mutex_enter(&ds->ds_lock); 194 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 195 !DS_UNIQUE_IS_ACCURATE(ds)); 196 delta = parent_delta(ds, -used); 197 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 198 mutex_exit(&ds->ds_lock); 199 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 200 delta, -compressed, -uncompressed, tx); 201 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 202 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 203 } else { 204 dprintf_bp(bp, "putting on dead list: %s", ""); 205 if (async) { 206 /* 207 * We are here as part of zio's write done callback, 208 * which means we're a zio interrupt thread. We can't 209 * call dsl_deadlist_insert() now because it may block 210 * waiting for I/O. Instead, put bp on the deferred 211 * queue and let dsl_pool_sync() finish the job. 212 */ 213 bplist_append(&ds->ds_pending_deadlist, bp); 214 } else { 215 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 216 } 217 ASSERT3U(ds->ds_prev->ds_object, ==, 218 dsl_dataset_phys(ds)->ds_prev_snap_obj); 219 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 220 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 221 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 222 ds->ds_object && bp->blk_birth > 223 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 224 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 225 mutex_enter(&ds->ds_prev->ds_lock); 226 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 227 mutex_exit(&ds->ds_prev->ds_lock); 228 } 229 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 230 dsl_dir_transfer_space(ds->ds_dir, used, 231 DD_USED_HEAD, DD_USED_SNAP, tx); 232 } 233 } 234 mutex_enter(&ds->ds_lock); 235 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 236 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 237 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 238 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 239 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 240 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 241 mutex_exit(&ds->ds_lock); 242 243 return (used); 244 } 245 246 uint64_t 247 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 248 { 249 uint64_t trysnap = 0; 250 251 if (ds == NULL) 252 return (0); 253 /* 254 * The snapshot creation could fail, but that would cause an 255 * incorrect FALSE return, which would only result in an 256 * overestimation of the amount of space that an operation would 257 * consume, which is OK. 258 * 259 * There's also a small window where we could miss a pending 260 * snapshot, because we could set the sync task in the quiescing 261 * phase. So this should only be used as a guess. 262 */ 263 if (ds->ds_trysnap_txg > 264 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 265 trysnap = ds->ds_trysnap_txg; 266 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 267 } 268 269 boolean_t 270 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 271 uint64_t blk_birth) 272 { 273 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 274 (bp != NULL && BP_IS_HOLE(bp))) 275 return (B_FALSE); 276 277 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 278 279 return (B_TRUE); 280 } 281 282 /* 283 * We have to release the fsid syncronously or we risk that a subsequent 284 * mount of the same dataset will fail to unique_insert the fsid. This 285 * failure would manifest itself as the fsid of this dataset changing 286 * between mounts which makes NFS clients quite unhappy. 287 */ 288 static void 289 dsl_dataset_evict_sync(void *dbu) 290 { 291 dsl_dataset_t *ds = dbu; 292 293 ASSERT(ds->ds_owner == NULL); 294 295 unique_remove(ds->ds_fsid_guid); 296 } 297 298 static void 299 dsl_dataset_evict_async(void *dbu) 300 { 301 dsl_dataset_t *ds = dbu; 302 303 ASSERT(ds->ds_owner == NULL); 304 305 ds->ds_dbuf = NULL; 306 307 if (ds->ds_objset != NULL) 308 dmu_objset_evict(ds->ds_objset); 309 310 if (ds->ds_prev) { 311 dsl_dataset_rele(ds->ds_prev, ds); 312 ds->ds_prev = NULL; 313 } 314 315 bplist_destroy(&ds->ds_pending_deadlist); 316 if (ds->ds_deadlist.dl_os != NULL) 317 dsl_deadlist_close(&ds->ds_deadlist); 318 if (ds->ds_dir) 319 dsl_dir_async_rele(ds->ds_dir, ds); 320 321 ASSERT(!list_link_active(&ds->ds_synced_link)); 322 323 list_destroy(&ds->ds_prop_cbs); 324 if (mutex_owned(&ds->ds_lock)) 325 mutex_exit(&ds->ds_lock); 326 mutex_destroy(&ds->ds_lock); 327 if (mutex_owned(&ds->ds_opening_lock)) 328 mutex_exit(&ds->ds_opening_lock); 329 mutex_destroy(&ds->ds_opening_lock); 330 mutex_destroy(&ds->ds_sendstream_lock); 331 refcount_destroy(&ds->ds_longholds); 332 rrw_destroy(&ds->ds_bp_rwlock); 333 334 kmem_free(ds, sizeof (dsl_dataset_t)); 335 } 336 337 int 338 dsl_dataset_get_snapname(dsl_dataset_t *ds) 339 { 340 dsl_dataset_phys_t *headphys; 341 int err; 342 dmu_buf_t *headdbuf; 343 dsl_pool_t *dp = ds->ds_dir->dd_pool; 344 objset_t *mos = dp->dp_meta_objset; 345 346 if (ds->ds_snapname[0]) 347 return (0); 348 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 349 return (0); 350 351 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 352 FTAG, &headdbuf); 353 if (err != 0) 354 return (err); 355 headphys = headdbuf->db_data; 356 err = zap_value_search(dp->dp_meta_objset, 357 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 358 dmu_buf_rele(headdbuf, FTAG); 359 return (err); 360 } 361 362 int 363 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 364 { 365 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 366 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 367 matchtype_t mt; 368 int err; 369 370 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 371 mt = MT_FIRST; 372 else 373 mt = MT_EXACT; 374 375 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 376 value, mt, NULL, 0, NULL); 377 if (err == ENOTSUP && mt == MT_FIRST) 378 err = zap_lookup(mos, snapobj, name, 8, 1, value); 379 return (err); 380 } 381 382 int 383 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 384 boolean_t adj_cnt) 385 { 386 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 387 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 388 matchtype_t mt; 389 int err; 390 391 dsl_dir_snap_cmtime_update(ds->ds_dir); 392 393 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 394 mt = MT_FIRST; 395 else 396 mt = MT_EXACT; 397 398 err = zap_remove_norm(mos, snapobj, name, mt, tx); 399 if (err == ENOTSUP && mt == MT_FIRST) 400 err = zap_remove(mos, snapobj, name, tx); 401 402 if (err == 0 && adj_cnt) 403 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 404 DD_FIELD_SNAPSHOT_COUNT, tx); 405 406 return (err); 407 } 408 409 boolean_t 410 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 411 { 412 dmu_buf_t *dbuf = ds->ds_dbuf; 413 boolean_t result = B_FALSE; 414 415 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 416 ds->ds_object, DMU_BONUS_BLKID, tag)) { 417 418 if (ds == dmu_buf_get_user(dbuf)) 419 result = B_TRUE; 420 else 421 dmu_buf_rele(dbuf, tag); 422 } 423 424 return (result); 425 } 426 427 int 428 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 429 dsl_dataset_t **dsp) 430 { 431 objset_t *mos = dp->dp_meta_objset; 432 dmu_buf_t *dbuf; 433 dsl_dataset_t *ds; 434 int err; 435 dmu_object_info_t doi; 436 437 ASSERT(dsl_pool_config_held(dp)); 438 439 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 440 if (err != 0) 441 return (err); 442 443 /* Make sure dsobj has the correct object type. */ 444 dmu_object_info_from_db(dbuf, &doi); 445 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 446 dmu_buf_rele(dbuf, tag); 447 return (SET_ERROR(EINVAL)); 448 } 449 450 ds = dmu_buf_get_user(dbuf); 451 if (ds == NULL) { 452 dsl_dataset_t *winner = NULL; 453 454 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 455 ds->ds_dbuf = dbuf; 456 ds->ds_object = dsobj; 457 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 458 459 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 460 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 461 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 462 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 463 refcount_create(&ds->ds_longholds); 464 465 bplist_create(&ds->ds_pending_deadlist); 466 dsl_deadlist_open(&ds->ds_deadlist, 467 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 468 469 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 470 offsetof(dmu_sendarg_t, dsa_link)); 471 472 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 473 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 474 475 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 476 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 477 if (!(spa_feature_table[f].fi_flags & 478 ZFEATURE_FLAG_PER_DATASET)) 479 continue; 480 err = zap_contains(mos, dsobj, 481 spa_feature_table[f].fi_guid); 482 if (err == 0) { 483 ds->ds_feature_inuse[f] = B_TRUE; 484 } else { 485 ASSERT3U(err, ==, ENOENT); 486 err = 0; 487 } 488 } 489 } 490 491 err = dsl_dir_hold_obj(dp, 492 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 493 if (err != 0) { 494 mutex_destroy(&ds->ds_lock); 495 mutex_destroy(&ds->ds_opening_lock); 496 mutex_destroy(&ds->ds_sendstream_lock); 497 refcount_destroy(&ds->ds_longholds); 498 bplist_destroy(&ds->ds_pending_deadlist); 499 dsl_deadlist_close(&ds->ds_deadlist); 500 kmem_free(ds, sizeof (dsl_dataset_t)); 501 dmu_buf_rele(dbuf, tag); 502 return (err); 503 } 504 505 if (!ds->ds_is_snapshot) { 506 ds->ds_snapname[0] = '\0'; 507 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 508 err = dsl_dataset_hold_obj(dp, 509 dsl_dataset_phys(ds)->ds_prev_snap_obj, 510 ds, &ds->ds_prev); 511 } 512 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 513 int zaperr = zap_lookup(mos, ds->ds_object, 514 DS_FIELD_BOOKMARK_NAMES, 515 sizeof (ds->ds_bookmarks), 1, 516 &ds->ds_bookmarks); 517 if (zaperr != ENOENT) 518 VERIFY0(zaperr); 519 } 520 } else { 521 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 522 err = dsl_dataset_get_snapname(ds); 523 if (err == 0 && 524 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 525 err = zap_count( 526 ds->ds_dir->dd_pool->dp_meta_objset, 527 dsl_dataset_phys(ds)->ds_userrefs_obj, 528 &ds->ds_userrefs); 529 } 530 } 531 532 if (err == 0 && !ds->ds_is_snapshot) { 533 err = dsl_prop_get_int_ds(ds, 534 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 535 &ds->ds_reserved); 536 if (err == 0) { 537 err = dsl_prop_get_int_ds(ds, 538 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 539 &ds->ds_quota); 540 } 541 } else { 542 ds->ds_reserved = ds->ds_quota = 0; 543 } 544 545 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict_sync, 546 dsl_dataset_evict_async, &ds->ds_dbuf); 547 if (err == 0) 548 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 549 550 if (err != 0 || winner != NULL) { 551 bplist_destroy(&ds->ds_pending_deadlist); 552 dsl_deadlist_close(&ds->ds_deadlist); 553 if (ds->ds_prev) 554 dsl_dataset_rele(ds->ds_prev, ds); 555 dsl_dir_rele(ds->ds_dir, ds); 556 mutex_destroy(&ds->ds_lock); 557 mutex_destroy(&ds->ds_opening_lock); 558 mutex_destroy(&ds->ds_sendstream_lock); 559 refcount_destroy(&ds->ds_longholds); 560 kmem_free(ds, sizeof (dsl_dataset_t)); 561 if (err != 0) { 562 dmu_buf_rele(dbuf, tag); 563 return (err); 564 } 565 ds = winner; 566 } else { 567 ds->ds_fsid_guid = 568 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 569 if (ds->ds_fsid_guid != 570 dsl_dataset_phys(ds)->ds_fsid_guid) { 571 zfs_dbgmsg("ds_fsid_guid changed from " 572 "%llx to %llx for pool %s dataset id %llu", 573 (long long) 574 dsl_dataset_phys(ds)->ds_fsid_guid, 575 (long long)ds->ds_fsid_guid, 576 spa_name(dp->dp_spa), 577 dsobj); 578 } 579 } 580 } 581 ASSERT3P(ds->ds_dbuf, ==, dbuf); 582 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 583 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 584 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 585 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 586 *dsp = ds; 587 return (0); 588 } 589 590 int 591 dsl_dataset_hold(dsl_pool_t *dp, const char *name, 592 void *tag, dsl_dataset_t **dsp) 593 { 594 dsl_dir_t *dd; 595 const char *snapname; 596 uint64_t obj; 597 int err = 0; 598 dsl_dataset_t *ds; 599 600 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 601 if (err != 0) 602 return (err); 603 604 ASSERT(dsl_pool_config_held(dp)); 605 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 606 if (obj != 0) 607 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 608 else 609 err = SET_ERROR(ENOENT); 610 611 /* we may be looking for a snapshot */ 612 if (err == 0 && snapname != NULL) { 613 dsl_dataset_t *snap_ds; 614 615 if (*snapname++ != '@') { 616 dsl_dataset_rele(ds, tag); 617 dsl_dir_rele(dd, FTAG); 618 return (SET_ERROR(ENOENT)); 619 } 620 621 dprintf("looking for snapshot '%s'\n", snapname); 622 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 623 if (err == 0) 624 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 625 dsl_dataset_rele(ds, tag); 626 627 if (err == 0) { 628 mutex_enter(&snap_ds->ds_lock); 629 if (snap_ds->ds_snapname[0] == 0) 630 (void) strlcpy(snap_ds->ds_snapname, snapname, 631 sizeof (snap_ds->ds_snapname)); 632 mutex_exit(&snap_ds->ds_lock); 633 ds = snap_ds; 634 } 635 } 636 if (err == 0) 637 *dsp = ds; 638 dsl_dir_rele(dd, FTAG); 639 return (err); 640 } 641 642 int 643 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 644 void *tag, dsl_dataset_t **dsp) 645 { 646 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 647 if (err != 0) 648 return (err); 649 if (!dsl_dataset_tryown(*dsp, tag)) { 650 dsl_dataset_rele(*dsp, tag); 651 *dsp = NULL; 652 return (SET_ERROR(EBUSY)); 653 } 654 return (0); 655 } 656 657 int 658 dsl_dataset_own(dsl_pool_t *dp, const char *name, 659 void *tag, dsl_dataset_t **dsp) 660 { 661 int err = dsl_dataset_hold(dp, name, tag, dsp); 662 if (err != 0) 663 return (err); 664 if (!dsl_dataset_tryown(*dsp, tag)) { 665 dsl_dataset_rele(*dsp, tag); 666 return (SET_ERROR(EBUSY)); 667 } 668 return (0); 669 } 670 671 /* 672 * See the comment above dsl_pool_hold() for details. In summary, a long 673 * hold is used to prevent destruction of a dataset while the pool hold 674 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 675 * 676 * The dataset and pool must be held when this function is called. After it 677 * is called, the pool hold may be released while the dataset is still held 678 * and accessed. 679 */ 680 void 681 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 682 { 683 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 684 (void) refcount_add(&ds->ds_longholds, tag); 685 } 686 687 void 688 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 689 { 690 (void) refcount_remove(&ds->ds_longholds, tag); 691 } 692 693 /* Return B_TRUE if there are any long holds on this dataset. */ 694 boolean_t 695 dsl_dataset_long_held(dsl_dataset_t *ds) 696 { 697 return (!refcount_is_zero(&ds->ds_longholds)); 698 } 699 700 void 701 dsl_dataset_name(dsl_dataset_t *ds, char *name) 702 { 703 if (ds == NULL) { 704 (void) strcpy(name, "mos"); 705 } else { 706 dsl_dir_name(ds->ds_dir, name); 707 VERIFY0(dsl_dataset_get_snapname(ds)); 708 if (ds->ds_snapname[0]) { 709 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 710 <, ZFS_MAX_DATASET_NAME_LEN); 711 /* 712 * We use a "recursive" mutex so that we 713 * can call dprintf_ds() with ds_lock held. 714 */ 715 if (!MUTEX_HELD(&ds->ds_lock)) { 716 mutex_enter(&ds->ds_lock); 717 VERIFY3U(strlcat(name, ds->ds_snapname, 718 ZFS_MAX_DATASET_NAME_LEN), <, 719 ZFS_MAX_DATASET_NAME_LEN); 720 mutex_exit(&ds->ds_lock); 721 } else { 722 VERIFY3U(strlcat(name, ds->ds_snapname, 723 ZFS_MAX_DATASET_NAME_LEN), <, 724 ZFS_MAX_DATASET_NAME_LEN); 725 } 726 } 727 } 728 } 729 730 int 731 dsl_dataset_namelen(dsl_dataset_t *ds) 732 { 733 VERIFY0(dsl_dataset_get_snapname(ds)); 734 mutex_enter(&ds->ds_lock); 735 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 736 mutex_exit(&ds->ds_lock); 737 return (len); 738 } 739 740 void 741 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 742 { 743 dmu_buf_rele(ds->ds_dbuf, tag); 744 } 745 746 void 747 dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 748 { 749 ASSERT3P(ds->ds_owner, ==, tag); 750 ASSERT(ds->ds_dbuf != NULL); 751 752 mutex_enter(&ds->ds_lock); 753 ds->ds_owner = NULL; 754 mutex_exit(&ds->ds_lock); 755 dsl_dataset_long_rele(ds, tag); 756 dsl_dataset_rele(ds, tag); 757 } 758 759 boolean_t 760 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 761 { 762 boolean_t gotit = FALSE; 763 764 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 765 mutex_enter(&ds->ds_lock); 766 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 767 ds->ds_owner = tag; 768 dsl_dataset_long_hold(ds, tag); 769 gotit = TRUE; 770 } 771 mutex_exit(&ds->ds_lock); 772 return (gotit); 773 } 774 775 boolean_t 776 dsl_dataset_has_owner(dsl_dataset_t *ds) 777 { 778 boolean_t rv; 779 mutex_enter(&ds->ds_lock); 780 rv = (ds->ds_owner != NULL); 781 mutex_exit(&ds->ds_lock); 782 return (rv); 783 } 784 785 static void 786 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 787 { 788 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 789 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 790 uint64_t zero = 0; 791 792 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 793 794 spa_feature_incr(spa, f, tx); 795 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 796 797 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 798 sizeof (zero), 1, &zero, tx)); 799 } 800 801 void 802 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 803 { 804 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 805 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 806 807 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 808 809 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 810 spa_feature_decr(spa, f, tx); 811 } 812 813 uint64_t 814 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 815 uint64_t flags, dmu_tx_t *tx) 816 { 817 dsl_pool_t *dp = dd->dd_pool; 818 dmu_buf_t *dbuf; 819 dsl_dataset_phys_t *dsphys; 820 uint64_t dsobj; 821 objset_t *mos = dp->dp_meta_objset; 822 823 if (origin == NULL) 824 origin = dp->dp_origin_snap; 825 826 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 827 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 828 ASSERT(dmu_tx_is_syncing(tx)); 829 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 830 831 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 832 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 833 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 834 dmu_buf_will_dirty(dbuf, tx); 835 dsphys = dbuf->db_data; 836 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 837 dsphys->ds_dir_obj = dd->dd_object; 838 dsphys->ds_flags = flags; 839 dsphys->ds_fsid_guid = unique_create(); 840 do { 841 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 842 sizeof (dsphys->ds_guid)); 843 } while (dsphys->ds_guid == 0); 844 dsphys->ds_snapnames_zapobj = 845 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 846 DMU_OT_NONE, 0, tx); 847 dsphys->ds_creation_time = gethrestime_sec(); 848 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 849 850 if (origin == NULL) { 851 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 852 } else { 853 dsl_dataset_t *ohds; /* head of the origin snapshot */ 854 855 dsphys->ds_prev_snap_obj = origin->ds_object; 856 dsphys->ds_prev_snap_txg = 857 dsl_dataset_phys(origin)->ds_creation_txg; 858 dsphys->ds_referenced_bytes = 859 dsl_dataset_phys(origin)->ds_referenced_bytes; 860 dsphys->ds_compressed_bytes = 861 dsl_dataset_phys(origin)->ds_compressed_bytes; 862 dsphys->ds_uncompressed_bytes = 863 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 864 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 865 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 866 rrw_exit(&origin->ds_bp_rwlock, FTAG); 867 868 /* 869 * Inherit flags that describe the dataset's contents 870 * (INCONSISTENT) or properties (Case Insensitive). 871 */ 872 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 873 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 874 875 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 876 if (origin->ds_feature_inuse[f]) 877 dsl_dataset_activate_feature(dsobj, f, tx); 878 } 879 880 dmu_buf_will_dirty(origin->ds_dbuf, tx); 881 dsl_dataset_phys(origin)->ds_num_children++; 882 883 VERIFY0(dsl_dataset_hold_obj(dp, 884 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 885 FTAG, &ohds)); 886 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 887 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 888 dsl_dataset_rele(ohds, FTAG); 889 890 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 891 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 892 dsl_dataset_phys(origin)->ds_next_clones_obj = 893 zap_create(mos, 894 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 895 } 896 VERIFY0(zap_add_int(mos, 897 dsl_dataset_phys(origin)->ds_next_clones_obj, 898 dsobj, tx)); 899 } 900 901 dmu_buf_will_dirty(dd->dd_dbuf, tx); 902 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 903 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 904 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 905 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 906 dsl_dir_phys(origin->ds_dir)->dd_clones = 907 zap_create(mos, 908 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 909 } 910 VERIFY0(zap_add_int(mos, 911 dsl_dir_phys(origin->ds_dir)->dd_clones, 912 dsobj, tx)); 913 } 914 } 915 916 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 917 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 918 919 dmu_buf_rele(dbuf, FTAG); 920 921 dmu_buf_will_dirty(dd->dd_dbuf, tx); 922 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 923 924 return (dsobj); 925 } 926 927 static void 928 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 929 { 930 objset_t *os; 931 932 VERIFY0(dmu_objset_from_ds(ds, &os)); 933 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 934 dsl_pool_t *dp = ds->ds_dir->dd_pool; 935 zio_t *zio; 936 937 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 938 939 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 940 dsl_dataset_sync(ds, zio, tx); 941 VERIFY0(zio_wait(zio)); 942 943 /* dsl_dataset_sync_done will drop this reference. */ 944 dmu_buf_add_ref(ds->ds_dbuf, ds); 945 dsl_dataset_sync_done(ds, tx); 946 } 947 } 948 949 uint64_t 950 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 951 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 952 { 953 dsl_pool_t *dp = pdd->dd_pool; 954 uint64_t dsobj, ddobj; 955 dsl_dir_t *dd; 956 957 ASSERT(dmu_tx_is_syncing(tx)); 958 ASSERT(lastname[0] != '@'); 959 960 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 961 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 962 963 dsobj = dsl_dataset_create_sync_dd(dd, origin, 964 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 965 966 dsl_deleg_set_create_perms(dd, tx, cr); 967 968 /* 969 * Since we're creating a new node we know it's a leaf, so we can 970 * initialize the counts if the limit feature is active. 971 */ 972 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 973 uint64_t cnt = 0; 974 objset_t *os = dd->dd_pool->dp_meta_objset; 975 976 dsl_dir_zapify(dd, tx); 977 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 978 sizeof (cnt), 1, &cnt, tx)); 979 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 980 sizeof (cnt), 1, &cnt, tx)); 981 } 982 983 dsl_dir_rele(dd, FTAG); 984 985 /* 986 * If we are creating a clone, make sure we zero out any stale 987 * data from the origin snapshots zil header. 988 */ 989 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 990 dsl_dataset_t *ds; 991 992 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 993 dsl_dataset_zero_zil(ds, tx); 994 dsl_dataset_rele(ds, FTAG); 995 } 996 997 return (dsobj); 998 } 999 1000 #if defined(__FreeBSD__) || defined(__NetBSD__) 1001 /* FreeBSD ioctl compat begin */ 1002 struct destroyarg { 1003 nvlist_t *nvl; 1004 const char *snapname; 1005 }; 1006 1007 static int 1008 dsl_check_snap_cb(const char *name, void *arg) 1009 { 1010 struct destroyarg *da = arg; 1011 dsl_dataset_t *ds; 1012 char *dsname; 1013 1014 dsname = kmem_asprintf("%s@%s", name, da->snapname); 1015 fnvlist_add_boolean(da->nvl, dsname); 1016 kmem_free(dsname, strlen(dsname) + 1); 1017 1018 return (0); 1019 } 1020 1021 int 1022 dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 1023 nvlist_t *snaps) 1024 { 1025 struct destroyarg *da; 1026 int err; 1027 1028 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 1029 da->nvl = snaps; 1030 da->snapname = snapname; 1031 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 1032 DS_FIND_CHILDREN); 1033 kmem_free(da, sizeof (struct destroyarg)); 1034 1035 return (err); 1036 } 1037 /* FreeBSD ioctl compat end */ 1038 #endif /* defined(__FreeBSD__) || defined(__NetBSD__) */ 1039 1040 /* 1041 * The unique space in the head dataset can be calculated by subtracting 1042 * the space used in the most recent snapshot, that is still being used 1043 * in this file system, from the space currently in use. To figure out 1044 * the space in the most recent snapshot still in use, we need to take 1045 * the total space used in the snapshot and subtract out the space that 1046 * has been freed up since the snapshot was taken. 1047 */ 1048 void 1049 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1050 { 1051 uint64_t mrs_used; 1052 uint64_t dlused, dlcomp, dluncomp; 1053 1054 ASSERT(!ds->ds_is_snapshot); 1055 1056 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1057 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1058 else 1059 mrs_used = 0; 1060 1061 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1062 1063 ASSERT3U(dlused, <=, mrs_used); 1064 dsl_dataset_phys(ds)->ds_unique_bytes = 1065 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1066 1067 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1068 SPA_VERSION_UNIQUE_ACCURATE) 1069 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1070 } 1071 1072 void 1073 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1074 dmu_tx_t *tx) 1075 { 1076 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1077 uint64_t count; 1078 int err; 1079 1080 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1081 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1082 obj, tx); 1083 /* 1084 * The err should not be ENOENT, but a bug in a previous version 1085 * of the code could cause upgrade_clones_cb() to not set 1086 * ds_next_snap_obj when it should, leading to a missing entry. 1087 * If we knew that the pool was created after 1088 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1089 * ENOENT. However, at least we can check that we don't have 1090 * too many entries in the next_clones_obj even after failing to 1091 * remove this one. 1092 */ 1093 if (err != ENOENT) 1094 VERIFY0(err); 1095 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1096 &count)); 1097 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1098 } 1099 1100 1101 blkptr_t * 1102 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1103 { 1104 return (&dsl_dataset_phys(ds)->ds_bp); 1105 } 1106 1107 spa_t * 1108 dsl_dataset_get_spa(dsl_dataset_t *ds) 1109 { 1110 return (ds->ds_dir->dd_pool->dp_spa); 1111 } 1112 1113 void 1114 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1115 { 1116 dsl_pool_t *dp; 1117 1118 if (ds == NULL) /* this is the meta-objset */ 1119 return; 1120 1121 ASSERT(ds->ds_objset != NULL); 1122 1123 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1124 panic("dirtying snapshot!"); 1125 1126 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1127 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1128 1129 dp = ds->ds_dir->dd_pool; 1130 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1131 /* up the hold count until we can be written out */ 1132 dmu_buf_add_ref(ds->ds_dbuf, ds); 1133 } 1134 } 1135 1136 boolean_t 1137 dsl_dataset_is_dirty(dsl_dataset_t *ds) 1138 { 1139 for (int t = 0; t < TXG_SIZE; t++) { 1140 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1141 ds, t)) 1142 return (B_TRUE); 1143 } 1144 return (B_FALSE); 1145 } 1146 1147 static int 1148 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1149 { 1150 uint64_t asize; 1151 1152 if (!dmu_tx_is_syncing(tx)) 1153 return (0); 1154 1155 /* 1156 * If there's an fs-only reservation, any blocks that might become 1157 * owned by the snapshot dataset must be accommodated by space 1158 * outside of the reservation. 1159 */ 1160 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1161 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1162 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1163 return (SET_ERROR(ENOSPC)); 1164 1165 /* 1166 * Propagate any reserved space for this snapshot to other 1167 * snapshot checks in this sync group. 1168 */ 1169 if (asize > 0) 1170 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1171 1172 return (0); 1173 } 1174 1175 typedef struct dsl_dataset_snapshot_arg { 1176 nvlist_t *ddsa_snaps; 1177 nvlist_t *ddsa_props; 1178 nvlist_t *ddsa_errors; 1179 cred_t *ddsa_cr; 1180 } dsl_dataset_snapshot_arg_t; 1181 1182 int 1183 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1184 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1185 { 1186 int error; 1187 uint64_t value; 1188 1189 ds->ds_trysnap_txg = tx->tx_txg; 1190 1191 if (!dmu_tx_is_syncing(tx)) 1192 return (0); 1193 1194 /* 1195 * We don't allow multiple snapshots of the same txg. If there 1196 * is already one, try again. 1197 */ 1198 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1199 return (SET_ERROR(EAGAIN)); 1200 1201 /* 1202 * Check for conflicting snapshot name. 1203 */ 1204 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1205 if (error == 0) 1206 return (SET_ERROR(EEXIST)); 1207 if (error != ENOENT) 1208 return (error); 1209 1210 /* 1211 * We don't allow taking snapshots of inconsistent datasets, such as 1212 * those into which we are currently receiving. However, if we are 1213 * creating this snapshot as part of a receive, this check will be 1214 * executed atomically with respect to the completion of the receive 1215 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1216 * case we ignore this, knowing it will be fixed up for us shortly in 1217 * dmu_recv_end_sync(). 1218 */ 1219 if (!recv && DS_IS_INCONSISTENT(ds)) 1220 return (SET_ERROR(EBUSY)); 1221 1222 /* 1223 * Skip the check for temporary snapshots or if we have already checked 1224 * the counts in dsl_dataset_snapshot_check. This means we really only 1225 * check the count here when we're receiving a stream. 1226 */ 1227 if (cnt != 0 && cr != NULL) { 1228 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1229 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1230 if (error != 0) 1231 return (error); 1232 } 1233 1234 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1235 if (error != 0) 1236 return (error); 1237 1238 return (0); 1239 } 1240 1241 static int 1242 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1243 { 1244 dsl_dataset_snapshot_arg_t *ddsa = arg; 1245 dsl_pool_t *dp = dmu_tx_pool(tx); 1246 nvpair_t *pair; 1247 int rv = 0; 1248 1249 /* 1250 * Pre-compute how many total new snapshots will be created for each 1251 * level in the tree and below. This is needed for validating the 1252 * snapshot limit when either taking a recursive snapshot or when 1253 * taking multiple snapshots. 1254 * 1255 * The problem is that the counts are not actually adjusted when 1256 * we are checking, only when we finally sync. For a single snapshot, 1257 * this is easy, the count will increase by 1 at each node up the tree, 1258 * but its more complicated for the recursive/multiple snapshot case. 1259 * 1260 * The dsl_fs_ss_limit_check function does recursively check the count 1261 * at each level up the tree but since it is validating each snapshot 1262 * independently we need to be sure that we are validating the complete 1263 * count for the entire set of snapshots. We do this by rolling up the 1264 * counts for each component of the name into an nvlist and then 1265 * checking each of those cases with the aggregated count. 1266 * 1267 * This approach properly handles not only the recursive snapshot 1268 * case (where we get all of those on the ddsa_snaps list) but also 1269 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1270 * validate the limit on 'a' using a count of 2). 1271 * 1272 * We validate the snapshot names in the third loop and only report 1273 * name errors once. 1274 */ 1275 if (dmu_tx_is_syncing(tx)) { 1276 nvlist_t *cnt_track = NULL; 1277 cnt_track = fnvlist_alloc(); 1278 1279 /* Rollup aggregated counts into the cnt_track list */ 1280 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1281 pair != NULL; 1282 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1283 char *pdelim; 1284 uint64_t val; 1285 char nm[MAXPATHLEN]; 1286 1287 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1288 pdelim = strchr(nm, '@'); 1289 if (pdelim == NULL) 1290 continue; 1291 *pdelim = '\0'; 1292 1293 do { 1294 if (nvlist_lookup_uint64(cnt_track, nm, 1295 &val) == 0) { 1296 /* update existing entry */ 1297 fnvlist_add_uint64(cnt_track, nm, 1298 val + 1); 1299 } else { 1300 /* add to list */ 1301 fnvlist_add_uint64(cnt_track, nm, 1); 1302 } 1303 1304 pdelim = strrchr(nm, '/'); 1305 if (pdelim != NULL) 1306 *pdelim = '\0'; 1307 } while (pdelim != NULL); 1308 } 1309 1310 /* Check aggregated counts at each level */ 1311 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1312 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1313 int error = 0; 1314 char *name; 1315 uint64_t cnt = 0; 1316 dsl_dataset_t *ds; 1317 1318 name = nvpair_name(pair); 1319 cnt = fnvpair_value_uint64(pair); 1320 ASSERT(cnt > 0); 1321 1322 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1323 if (error == 0) { 1324 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1325 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1326 ddsa->ddsa_cr); 1327 dsl_dataset_rele(ds, FTAG); 1328 } 1329 1330 if (error != 0) { 1331 if (ddsa->ddsa_errors != NULL) 1332 fnvlist_add_int32(ddsa->ddsa_errors, 1333 name, error); 1334 rv = error; 1335 /* only report one error for this check */ 1336 break; 1337 } 1338 } 1339 nvlist_free(cnt_track); 1340 } 1341 1342 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1343 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1344 int error = 0; 1345 dsl_dataset_t *ds; 1346 char *name, *atp; 1347 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1348 1349 name = nvpair_name(pair); 1350 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1351 error = SET_ERROR(ENAMETOOLONG); 1352 if (error == 0) { 1353 atp = strchr(name, '@'); 1354 if (atp == NULL) 1355 error = SET_ERROR(EINVAL); 1356 if (error == 0) 1357 (void) strlcpy(dsname, name, atp - name + 1); 1358 } 1359 if (error == 0) 1360 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1361 if (error == 0) { 1362 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1363 error = dsl_dataset_snapshot_check_impl(ds, 1364 atp + 1, tx, B_FALSE, 0, NULL); 1365 dsl_dataset_rele(ds, FTAG); 1366 } 1367 1368 if (error != 0) { 1369 if (ddsa->ddsa_errors != NULL) { 1370 fnvlist_add_int32(ddsa->ddsa_errors, 1371 name, error); 1372 } 1373 rv = error; 1374 } 1375 } 1376 1377 return (rv); 1378 } 1379 1380 void 1381 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1382 dmu_tx_t *tx) 1383 { 1384 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1385 dmu_buf_t *dbuf; 1386 dsl_dataset_phys_t *dsphys; 1387 uint64_t dsobj, crtxg; 1388 objset_t *mos = dp->dp_meta_objset; 1389 objset_t *os; 1390 1391 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1392 1393 /* 1394 * If we are on an old pool, the zil must not be active, in which 1395 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1396 */ 1397 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1398 dmu_objset_from_ds(ds, &os) != 0 || 1399 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1400 sizeof (zero_zil)) == 0); 1401 1402 /* Should not snapshot a dirty dataset. */ 1403 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1404 ds, tx->tx_txg)); 1405 1406 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1407 1408 /* 1409 * The origin's ds_creation_txg has to be < TXG_INITIAL 1410 */ 1411 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1412 crtxg = 1; 1413 else 1414 crtxg = tx->tx_txg; 1415 1416 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1417 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1418 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1419 dmu_buf_will_dirty(dbuf, tx); 1420 dsphys = dbuf->db_data; 1421 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1422 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1423 dsphys->ds_fsid_guid = unique_create(); 1424 do { 1425 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1426 sizeof (dsphys->ds_guid)); 1427 } while (dsphys->ds_guid == 0); 1428 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1429 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1430 dsphys->ds_next_snap_obj = ds->ds_object; 1431 dsphys->ds_num_children = 1; 1432 dsphys->ds_creation_time = gethrestime_sec(); 1433 dsphys->ds_creation_txg = crtxg; 1434 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1435 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1436 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1437 dsphys->ds_uncompressed_bytes = 1438 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1439 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1440 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1441 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1442 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1443 dmu_buf_rele(dbuf, FTAG); 1444 1445 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1446 if (ds->ds_feature_inuse[f]) 1447 dsl_dataset_activate_feature(dsobj, f, tx); 1448 } 1449 1450 ASSERT3U(ds->ds_prev != 0, ==, 1451 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1452 if (ds->ds_prev) { 1453 uint64_t next_clones_obj = 1454 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1455 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1456 ds->ds_object || 1457 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1458 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1459 ds->ds_object) { 1460 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1461 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1462 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1463 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1464 } else if (next_clones_obj != 0) { 1465 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1466 dsphys->ds_next_snap_obj, tx); 1467 VERIFY0(zap_add_int(mos, 1468 next_clones_obj, dsobj, tx)); 1469 } 1470 } 1471 1472 /* 1473 * If we have a reference-reservation on this dataset, we will 1474 * need to increase the amount of refreservation being charged 1475 * since our unique space is going to zero. 1476 */ 1477 if (ds->ds_reserved) { 1478 int64_t delta; 1479 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1480 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1481 ds->ds_reserved); 1482 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1483 delta, 0, 0, tx); 1484 } 1485 1486 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1487 dsl_dataset_phys(ds)->ds_deadlist_obj = 1488 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1489 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1490 dsl_deadlist_close(&ds->ds_deadlist); 1491 dsl_deadlist_open(&ds->ds_deadlist, mos, 1492 dsl_dataset_phys(ds)->ds_deadlist_obj); 1493 dsl_deadlist_add_key(&ds->ds_deadlist, 1494 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1495 1496 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1497 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1498 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1499 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1500 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1501 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1502 1503 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1504 snapname, 8, 1, &dsobj, tx)); 1505 1506 if (ds->ds_prev) 1507 dsl_dataset_rele(ds->ds_prev, ds); 1508 VERIFY0(dsl_dataset_hold_obj(dp, 1509 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1510 1511 dsl_scan_ds_snapshotted(ds, tx); 1512 1513 dsl_dir_snap_cmtime_update(ds->ds_dir); 1514 1515 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1516 } 1517 1518 static void 1519 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1520 { 1521 dsl_dataset_snapshot_arg_t *ddsa = arg; 1522 dsl_pool_t *dp = dmu_tx_pool(tx); 1523 nvpair_t *pair; 1524 1525 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1526 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1527 dsl_dataset_t *ds; 1528 char *name, *atp; 1529 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1530 1531 name = nvpair_name(pair); 1532 atp = strchr(name, '@'); 1533 (void) strlcpy(dsname, name, atp - name + 1); 1534 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1535 1536 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1537 if (ddsa->ddsa_props != NULL) { 1538 dsl_props_set_sync_impl(ds->ds_prev, 1539 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1540 } 1541 dsl_dataset_rele(ds, FTAG); 1542 } 1543 } 1544 1545 /* 1546 * The snapshots must all be in the same pool. 1547 * All-or-nothing: if there are any failures, nothing will be modified. 1548 */ 1549 int 1550 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1551 { 1552 dsl_dataset_snapshot_arg_t ddsa; 1553 nvpair_t *pair; 1554 boolean_t needsuspend; 1555 int error; 1556 spa_t *spa; 1557 char *firstname; 1558 nvlist_t *suspended = NULL; 1559 1560 pair = nvlist_next_nvpair(snaps, NULL); 1561 if (pair == NULL) 1562 return (0); 1563 firstname = nvpair_name(pair); 1564 1565 error = spa_open(firstname, &spa, FTAG); 1566 if (error != 0) 1567 return (error); 1568 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1569 spa_close(spa, FTAG); 1570 1571 if (needsuspend) { 1572 suspended = fnvlist_alloc(); 1573 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1574 pair = nvlist_next_nvpair(snaps, pair)) { 1575 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1576 char *snapname = nvpair_name(pair); 1577 char *atp; 1578 void *cookie; 1579 1580 atp = strchr(snapname, '@'); 1581 if (atp == NULL) { 1582 error = SET_ERROR(EINVAL); 1583 break; 1584 } 1585 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1586 1587 error = zil_suspend(fsname, &cookie); 1588 if (error != 0) 1589 break; 1590 fnvlist_add_uint64(suspended, fsname, 1591 (uintptr_t)cookie); 1592 } 1593 } 1594 1595 ddsa.ddsa_snaps = snaps; 1596 ddsa.ddsa_props = props; 1597 ddsa.ddsa_errors = errors; 1598 ddsa.ddsa_cr = CRED(); 1599 1600 if (error == 0) { 1601 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1602 dsl_dataset_snapshot_sync, &ddsa, 1603 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1604 } 1605 1606 if (suspended != NULL) { 1607 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1608 pair = nvlist_next_nvpair(suspended, pair)) { 1609 zil_resume((void *)(uintptr_t) 1610 fnvpair_value_uint64(pair)); 1611 } 1612 fnvlist_free(suspended); 1613 } 1614 1615 #if defined(__FreeBSD__) || defined(__NetBSD__) 1616 #ifdef _KERNEL 1617 if (error == 0) { 1618 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1619 pair = nvlist_next_nvpair(snaps, pair)) { 1620 char *snapname = nvpair_name(pair); 1621 zvol_create_minors(snapname); 1622 } 1623 } 1624 #endif 1625 #endif 1626 return (error); 1627 } 1628 1629 typedef struct dsl_dataset_snapshot_tmp_arg { 1630 const char *ddsta_fsname; 1631 const char *ddsta_snapname; 1632 minor_t ddsta_cleanup_minor; 1633 const char *ddsta_htag; 1634 } dsl_dataset_snapshot_tmp_arg_t; 1635 1636 static int 1637 dsl_dataset_snapshot_tmp_check(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 int error; 1643 1644 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1645 if (error != 0) 1646 return (error); 1647 1648 /* NULL cred means no limit check for tmp snapshot */ 1649 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1650 tx, B_FALSE, 0, NULL); 1651 if (error != 0) { 1652 dsl_dataset_rele(ds, FTAG); 1653 return (error); 1654 } 1655 1656 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1657 dsl_dataset_rele(ds, FTAG); 1658 return (SET_ERROR(ENOTSUP)); 1659 } 1660 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1661 B_TRUE, tx); 1662 if (error != 0) { 1663 dsl_dataset_rele(ds, FTAG); 1664 return (error); 1665 } 1666 1667 dsl_dataset_rele(ds, FTAG); 1668 return (0); 1669 } 1670 1671 static void 1672 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1673 { 1674 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1675 dsl_pool_t *dp = dmu_tx_pool(tx); 1676 dsl_dataset_t *ds; 1677 1678 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1679 1680 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1681 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1682 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1683 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1684 1685 dsl_dataset_rele(ds, FTAG); 1686 } 1687 1688 int 1689 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1690 minor_t cleanup_minor, const char *htag) 1691 { 1692 dsl_dataset_snapshot_tmp_arg_t ddsta; 1693 int error; 1694 spa_t *spa; 1695 boolean_t needsuspend; 1696 void *cookie; 1697 1698 ddsta.ddsta_fsname = fsname; 1699 ddsta.ddsta_snapname = snapname; 1700 ddsta.ddsta_cleanup_minor = cleanup_minor; 1701 ddsta.ddsta_htag = htag; 1702 1703 error = spa_open(fsname, &spa, FTAG); 1704 if (error != 0) 1705 return (error); 1706 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1707 spa_close(spa, FTAG); 1708 1709 if (needsuspend) { 1710 error = zil_suspend(fsname, &cookie); 1711 if (error != 0) 1712 return (error); 1713 } 1714 1715 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1716 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1717 1718 if (needsuspend) 1719 zil_resume(cookie); 1720 return (error); 1721 } 1722 1723 1724 void 1725 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1726 { 1727 ASSERT(dmu_tx_is_syncing(tx)); 1728 ASSERT(ds->ds_objset != NULL); 1729 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1730 1731 /* 1732 * in case we had to change ds_fsid_guid when we opened it, 1733 * sync it out now. 1734 */ 1735 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1736 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1737 1738 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1739 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1740 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1741 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1742 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1743 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1744 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1745 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1746 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1747 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1748 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1749 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1750 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1751 } 1752 1753 dmu_objset_sync(ds->ds_objset, zio, tx); 1754 1755 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1756 if (ds->ds_feature_activation_needed[f]) { 1757 if (ds->ds_feature_inuse[f]) 1758 continue; 1759 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1760 ds->ds_feature_inuse[f] = B_TRUE; 1761 } 1762 } 1763 } 1764 1765 static int 1766 deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 1767 { 1768 dsl_deadlist_t *dl = arg; 1769 dsl_deadlist_insert(dl, bp, tx); 1770 return (0); 1771 } 1772 1773 void 1774 dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 1775 { 1776 objset_t *os = ds->ds_objset; 1777 1778 bplist_iterate(&ds->ds_pending_deadlist, 1779 deadlist_enqueue_cb, &ds->ds_deadlist, tx); 1780 1781 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 1782 1783 dmu_buf_rele(ds->ds_dbuf, ds); 1784 } 1785 1786 static void 1787 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1788 { 1789 uint64_t count = 0; 1790 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1791 zap_cursor_t zc; 1792 zap_attribute_t za; 1793 nvlist_t *propval = fnvlist_alloc(); 1794 nvlist_t *val; 1795 1796 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1797 1798 /* 1799 * We use nvlist_alloc() instead of fnvlist_alloc() because the 1800 * latter would allocate the list with NV_UNIQUE_NAME flag. 1801 * As a result, every time a clone name is appended to the list 1802 * it would be (linearly) searched for for a duplicate name. 1803 * We already know that all clone names must be unique and we 1804 * want avoid the quadratic complexity of double-checking that 1805 * because we can have a large number of clones. 1806 */ 1807 VERIFY0(nvlist_alloc(&val, 0, KM_SLEEP)); 1808 1809 /* 1810 * There may be missing entries in ds_next_clones_obj 1811 * due to a bug in a previous version of the code. 1812 * Only trust it if it has the right number of entries. 1813 */ 1814 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1815 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1816 &count)); 1817 } 1818 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1819 goto fail; 1820 for (zap_cursor_init(&zc, mos, 1821 dsl_dataset_phys(ds)->ds_next_clones_obj); 1822 zap_cursor_retrieve(&zc, &za) == 0; 1823 zap_cursor_advance(&zc)) { 1824 dsl_dataset_t *clone; 1825 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1826 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1827 za.za_first_integer, FTAG, &clone)); 1828 dsl_dir_name(clone->ds_dir, buf); 1829 fnvlist_add_boolean(val, buf); 1830 dsl_dataset_rele(clone, FTAG); 1831 } 1832 zap_cursor_fini(&zc); 1833 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1834 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1835 fail: 1836 nvlist_free(val); 1837 nvlist_free(propval); 1838 } 1839 1840 static void 1841 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1842 { 1843 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1844 1845 if (dsl_dataset_has_resume_receive_state(ds)) { 1846 char *str; 1847 void *packed; 1848 uint8_t *compressed; 1849 uint64_t val; 1850 nvlist_t *token_nv = fnvlist_alloc(); 1851 size_t packed_size, compressed_size; 1852 1853 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1854 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1855 fnvlist_add_uint64(token_nv, "fromguid", val); 1856 } 1857 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1858 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1859 fnvlist_add_uint64(token_nv, "object", val); 1860 } 1861 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1862 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1863 fnvlist_add_uint64(token_nv, "offset", val); 1864 } 1865 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1866 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1867 fnvlist_add_uint64(token_nv, "bytes", val); 1868 } 1869 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1870 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1871 fnvlist_add_uint64(token_nv, "toguid", val); 1872 } 1873 char buf[256]; 1874 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1875 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1876 fnvlist_add_string(token_nv, "toname", buf); 1877 } 1878 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1879 DS_FIELD_RESUME_EMBEDOK) == 0) { 1880 fnvlist_add_boolean(token_nv, "embedok"); 1881 } 1882 packed = fnvlist_pack(token_nv, &packed_size); 1883 fnvlist_free(token_nv); 1884 compressed = kmem_alloc(packed_size, KM_SLEEP); 1885 1886 compressed_size = gzip_compress(packed, compressed, 1887 packed_size, packed_size, 6); 1888 1889 zio_cksum_t cksum; 1890 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1891 1892 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1893 for (int i = 0; i < compressed_size; i++) { 1894 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1895 } 1896 str[compressed_size * 2] = '\0'; 1897 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1898 ZFS_SEND_RESUME_TOKEN_VERSION, 1899 (longlong_t)cksum.zc_word[0], 1900 (longlong_t)packed_size, str); 1901 dsl_prop_nvlist_add_string(nv, 1902 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1903 kmem_free(packed, packed_size); 1904 kmem_free(str, compressed_size * 2 + 1); 1905 kmem_free(compressed, packed_size); 1906 strfree(propval); 1907 } 1908 } 1909 1910 void 1911 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1912 { 1913 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1914 uint64_t refd, avail, uobjs, aobjs, ratio; 1915 1916 ASSERT(dsl_pool_config_held(dp)); 1917 1918 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1919 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1920 dsl_dataset_phys(ds)->ds_compressed_bytes); 1921 1922 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1923 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1924 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1925 1926 if (ds->ds_is_snapshot) { 1927 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1928 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1929 dsl_dataset_phys(ds)->ds_unique_bytes); 1930 get_clones_stat(ds, nv); 1931 } else { 1932 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1933 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1934 dsl_dataset_name(ds->ds_prev, buf); 1935 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1936 } 1937 1938 dsl_dir_stats(ds->ds_dir, nv); 1939 } 1940 1941 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1942 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1943 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1944 1945 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1946 dsl_dataset_phys(ds)->ds_creation_time); 1947 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1948 dsl_dataset_phys(ds)->ds_creation_txg); 1949 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1950 ds->ds_quota); 1951 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1952 ds->ds_reserved); 1953 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1954 dsl_dataset_phys(ds)->ds_guid); 1955 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1956 dsl_dataset_phys(ds)->ds_unique_bytes); 1957 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1958 ds->ds_object); 1959 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1960 ds->ds_userrefs); 1961 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1962 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1963 1964 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1965 uint64_t written, comp, uncomp; 1966 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1967 dsl_dataset_t *prev; 1968 1969 int err = dsl_dataset_hold_obj(dp, 1970 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1971 if (err == 0) { 1972 err = dsl_dataset_space_written(prev, ds, &written, 1973 &comp, &uncomp); 1974 dsl_dataset_rele(prev, FTAG); 1975 if (err == 0) { 1976 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1977 written); 1978 } 1979 } 1980 } 1981 1982 if (!dsl_dataset_is_snapshot(ds)) { 1983 /* 1984 * A failed "newfs" (e.g. full) resumable receive leaves 1985 * the stats set on this dataset. Check here for the prop. 1986 */ 1987 get_receive_resume_stats(ds, nv); 1988 1989 /* 1990 * A failed incremental resumable receive leaves the 1991 * stats set on our child named "%recv". Check the child 1992 * for the prop. 1993 */ 1994 /* 6 extra bytes for /%recv */ 1995 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1996 dsl_dataset_t *recv_ds; 1997 dsl_dataset_name(ds, recvname); 1998 if (strlcat(recvname, "/", sizeof (recvname)) < 1999 sizeof (recvname) && 2000 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 2001 sizeof (recvname) && 2002 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 2003 get_receive_resume_stats(recv_ds, nv); 2004 dsl_dataset_rele(recv_ds, FTAG); 2005 } 2006 } 2007 } 2008 2009 void 2010 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 2011 { 2012 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2013 ASSERT(dsl_pool_config_held(dp)); 2014 2015 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 2016 stat->dds_inconsistent = 2017 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 2018 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 2019 stat->dds_origin[0] = '\0'; 2020 if (ds->ds_is_snapshot) { 2021 stat->dds_is_snapshot = B_TRUE; 2022 stat->dds_num_clones = 2023 dsl_dataset_phys(ds)->ds_num_children - 1; 2024 } else { 2025 stat->dds_is_snapshot = B_FALSE; 2026 stat->dds_num_clones = 0; 2027 2028 if (dsl_dir_is_clone(ds->ds_dir)) { 2029 dsl_dataset_t *ods; 2030 2031 VERIFY0(dsl_dataset_hold_obj(dp, 2032 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 2033 FTAG, &ods)); 2034 dsl_dataset_name(ods, stat->dds_origin); 2035 dsl_dataset_rele(ods, FTAG); 2036 } 2037 } 2038 } 2039 2040 uint64_t 2041 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2042 { 2043 return (ds->ds_fsid_guid); 2044 } 2045 2046 void 2047 dsl_dataset_space(dsl_dataset_t *ds, 2048 uint64_t *refdbytesp, uint64_t *availbytesp, 2049 uint64_t *usedobjsp, uint64_t *availobjsp) 2050 { 2051 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2052 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2053 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2054 *availbytesp += 2055 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2056 if (ds->ds_quota != 0) { 2057 /* 2058 * Adjust available bytes according to refquota 2059 */ 2060 if (*refdbytesp < ds->ds_quota) 2061 *availbytesp = MIN(*availbytesp, 2062 ds->ds_quota - *refdbytesp); 2063 else 2064 *availbytesp = 0; 2065 } 2066 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2067 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2068 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2069 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2070 } 2071 2072 boolean_t 2073 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2074 { 2075 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2076 uint64_t birth; 2077 2078 ASSERT(dsl_pool_config_held(dp)); 2079 if (snap == NULL) 2080 return (B_FALSE); 2081 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2082 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2083 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2084 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2085 objset_t *os, *os_snap; 2086 /* 2087 * It may be that only the ZIL differs, because it was 2088 * reset in the head. Don't count that as being 2089 * modified. 2090 */ 2091 if (dmu_objset_from_ds(ds, &os) != 0) 2092 return (B_TRUE); 2093 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2094 return (B_TRUE); 2095 return (bcmp(&os->os_phys->os_meta_dnode, 2096 &os_snap->os_phys->os_meta_dnode, 2097 sizeof (os->os_phys->os_meta_dnode)) != 0); 2098 } 2099 return (B_FALSE); 2100 } 2101 2102 typedef struct dsl_dataset_rename_snapshot_arg { 2103 const char *ddrsa_fsname; 2104 const char *ddrsa_oldsnapname; 2105 const char *ddrsa_newsnapname; 2106 boolean_t ddrsa_recursive; 2107 dmu_tx_t *ddrsa_tx; 2108 } dsl_dataset_rename_snapshot_arg_t; 2109 2110 /* ARGSUSED */ 2111 static int 2112 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2113 dsl_dataset_t *hds, void *arg) 2114 { 2115 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2116 int error; 2117 uint64_t val; 2118 2119 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2120 if (error != 0) { 2121 /* ignore nonexistent snapshots */ 2122 return (error == ENOENT ? 0 : error); 2123 } 2124 2125 /* new name should not exist */ 2126 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2127 if (error == 0) 2128 error = SET_ERROR(EEXIST); 2129 else if (error == ENOENT) 2130 error = 0; 2131 2132 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2133 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2134 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2135 error = SET_ERROR(ENAMETOOLONG); 2136 2137 return (error); 2138 } 2139 2140 static int 2141 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2142 { 2143 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2144 dsl_pool_t *dp = dmu_tx_pool(tx); 2145 dsl_dataset_t *hds; 2146 int error; 2147 2148 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2149 if (error != 0) 2150 return (error); 2151 2152 if (ddrsa->ddrsa_recursive) { 2153 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2154 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2155 DS_FIND_CHILDREN); 2156 } else { 2157 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2158 } 2159 dsl_dataset_rele(hds, FTAG); 2160 return (error); 2161 } 2162 2163 static int 2164 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2165 dsl_dataset_t *hds, void *arg) 2166 { 2167 #if defined(__FreeBSD__) || defined(__NetBSD__) 2168 #ifdef _KERNEL 2169 char *oldname, *newname; 2170 #endif 2171 #endif 2172 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2173 dsl_dataset_t *ds; 2174 uint64_t val; 2175 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2176 int error; 2177 2178 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2179 ASSERT(error == 0 || error == ENOENT); 2180 if (error == ENOENT) { 2181 /* ignore nonexistent snapshots */ 2182 return (0); 2183 } 2184 2185 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2186 2187 /* log before we change the name */ 2188 spa_history_log_internal_ds(ds, "rename", tx, 2189 "-> @%s", ddrsa->ddrsa_newsnapname); 2190 2191 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2192 B_FALSE)); 2193 mutex_enter(&ds->ds_lock); 2194 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2195 mutex_exit(&ds->ds_lock); 2196 VERIFY0(zap_add(dp->dp_meta_objset, 2197 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2198 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2199 2200 #if defined(__FreeBSD__) || defined(__NetBSD__) 2201 #ifdef _KERNEL 2202 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2203 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2204 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2205 ddrsa->ddrsa_oldsnapname); 2206 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2207 ddrsa->ddrsa_newsnapname); 2208 zfsvfs_update_fromname(oldname, newname); 2209 zvol_rename_minors(oldname, newname); 2210 kmem_free(newname, MAXPATHLEN); 2211 kmem_free(oldname, MAXPATHLEN); 2212 #endif 2213 #endif 2214 dsl_dataset_rele(ds, FTAG); 2215 2216 return (0); 2217 } 2218 2219 static void 2220 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2221 { 2222 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2223 dsl_pool_t *dp = dmu_tx_pool(tx); 2224 dsl_dataset_t *hds; 2225 2226 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2227 ddrsa->ddrsa_tx = tx; 2228 if (ddrsa->ddrsa_recursive) { 2229 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2230 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2231 DS_FIND_CHILDREN)); 2232 } else { 2233 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2234 } 2235 dsl_dataset_rele(hds, FTAG); 2236 } 2237 2238 int 2239 dsl_dataset_rename_snapshot(const char *fsname, 2240 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2241 { 2242 dsl_dataset_rename_snapshot_arg_t ddrsa; 2243 2244 ddrsa.ddrsa_fsname = fsname; 2245 ddrsa.ddrsa_oldsnapname = oldsnapname; 2246 ddrsa.ddrsa_newsnapname = newsnapname; 2247 ddrsa.ddrsa_recursive = recursive; 2248 2249 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2250 dsl_dataset_rename_snapshot_sync, &ddrsa, 2251 1, ZFS_SPACE_CHECK_RESERVED)); 2252 } 2253 2254 /* 2255 * If we're doing an ownership handoff, we need to make sure that there is 2256 * only one long hold on the dataset. We're not allowed to change anything here 2257 * so we don't permanently release the long hold or regular hold here. We want 2258 * to do this only when syncing to avoid the dataset unexpectedly going away 2259 * when we release the long hold. 2260 */ 2261 static int 2262 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2263 { 2264 boolean_t held; 2265 2266 if (!dmu_tx_is_syncing(tx)) 2267 return (0); 2268 2269 if (owner != NULL) { 2270 VERIFY3P(ds->ds_owner, ==, owner); 2271 dsl_dataset_long_rele(ds, owner); 2272 } 2273 2274 held = dsl_dataset_long_held(ds); 2275 2276 if (owner != NULL) 2277 dsl_dataset_long_hold(ds, owner); 2278 2279 if (held) 2280 return (SET_ERROR(EBUSY)); 2281 2282 return (0); 2283 } 2284 2285 typedef struct dsl_dataset_rollback_arg { 2286 const char *ddra_fsname; 2287 void *ddra_owner; 2288 nvlist_t *ddra_result; 2289 } dsl_dataset_rollback_arg_t; 2290 2291 static int 2292 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2293 { 2294 dsl_dataset_rollback_arg_t *ddra = arg; 2295 dsl_pool_t *dp = dmu_tx_pool(tx); 2296 dsl_dataset_t *ds; 2297 int64_t unused_refres_delta; 2298 int error; 2299 2300 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2301 if (error != 0) 2302 return (error); 2303 2304 /* must not be a snapshot */ 2305 if (ds->ds_is_snapshot) { 2306 dsl_dataset_rele(ds, FTAG); 2307 return (SET_ERROR(EINVAL)); 2308 } 2309 2310 /* must have a most recent snapshot */ 2311 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2312 dsl_dataset_rele(ds, FTAG); 2313 return (SET_ERROR(EINVAL)); 2314 } 2315 2316 /* 2317 * No rollback to a snapshot created in the current txg, because 2318 * the rollback may dirty the dataset and create blocks that are 2319 * not reachable from the rootbp while having a birth txg that 2320 * falls into the snapshot's range. 2321 */ 2322 if (dmu_tx_is_syncing(tx) && 2323 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 2324 dsl_dataset_rele(ds, FTAG); 2325 return (SET_ERROR(EAGAIN)); 2326 } 2327 2328 /* must not have any bookmarks after the most recent snapshot */ 2329 nvlist_t *proprequest = fnvlist_alloc(); 2330 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2331 nvlist_t *bookmarks = fnvlist_alloc(); 2332 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2333 fnvlist_free(proprequest); 2334 if (error != 0) 2335 return (error); 2336 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2337 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2338 nvlist_t *valuenv = 2339 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2340 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2341 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2342 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2343 fnvlist_free(bookmarks); 2344 dsl_dataset_rele(ds, FTAG); 2345 return (SET_ERROR(EEXIST)); 2346 } 2347 } 2348 fnvlist_free(bookmarks); 2349 2350 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2351 if (error != 0) { 2352 dsl_dataset_rele(ds, FTAG); 2353 return (error); 2354 } 2355 2356 /* 2357 * Check if the snap we are rolling back to uses more than 2358 * the refquota. 2359 */ 2360 if (ds->ds_quota != 0 && 2361 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2362 dsl_dataset_rele(ds, FTAG); 2363 return (SET_ERROR(EDQUOT)); 2364 } 2365 2366 /* 2367 * When we do the clone swap, we will temporarily use more space 2368 * due to the refreservation (the head will no longer have any 2369 * unique space, so the entire amount of the refreservation will need 2370 * to be free). We will immediately destroy the clone, freeing 2371 * this space, but the freeing happens over many txg's. 2372 */ 2373 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2374 dsl_dataset_phys(ds)->ds_unique_bytes); 2375 2376 if (unused_refres_delta > 0 && 2377 unused_refres_delta > 2378 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2379 dsl_dataset_rele(ds, FTAG); 2380 return (SET_ERROR(ENOSPC)); 2381 } 2382 2383 dsl_dataset_rele(ds, FTAG); 2384 return (0); 2385 } 2386 2387 static void 2388 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2389 { 2390 dsl_dataset_rollback_arg_t *ddra = arg; 2391 dsl_pool_t *dp = dmu_tx_pool(tx); 2392 dsl_dataset_t *ds, *clone; 2393 uint64_t cloneobj; 2394 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2395 2396 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2397 2398 dsl_dataset_name(ds->ds_prev, namebuf); 2399 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2400 2401 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2402 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2403 2404 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2405 2406 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2407 dsl_dataset_zero_zil(ds, tx); 2408 2409 dsl_destroy_head_sync_impl(clone, tx); 2410 2411 dsl_dataset_rele(clone, FTAG); 2412 dsl_dataset_rele(ds, FTAG); 2413 } 2414 2415 /* 2416 * Rolls back the given filesystem or volume to the most recent snapshot. 2417 * The name of the most recent snapshot will be returned under key "target" 2418 * in the result nvlist. 2419 * 2420 * If owner != NULL: 2421 * - The existing dataset MUST be owned by the specified owner at entry 2422 * - Upon return, dataset will still be held by the same owner, whether we 2423 * succeed or not. 2424 * 2425 * This mode is required any time the existing filesystem is mounted. See 2426 * notes above zfs_suspend_fs() for further details. 2427 */ 2428 int 2429 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2430 { 2431 dsl_dataset_rollback_arg_t ddra; 2432 2433 ddra.ddra_fsname = fsname; 2434 ddra.ddra_owner = owner; 2435 ddra.ddra_result = result; 2436 2437 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2438 dsl_dataset_rollback_sync, &ddra, 2439 1, ZFS_SPACE_CHECK_RESERVED)); 2440 } 2441 2442 struct promotenode { 2443 list_node_t link; 2444 dsl_dataset_t *ds; 2445 }; 2446 2447 typedef struct dsl_dataset_promote_arg { 2448 const char *ddpa_clonename; 2449 dsl_dataset_t *ddpa_clone; 2450 list_t shared_snaps, origin_snaps, clone_snaps; 2451 dsl_dataset_t *origin_origin; /* origin of the origin */ 2452 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2453 char *err_ds; 2454 cred_t *cr; 2455 } dsl_dataset_promote_arg_t; 2456 2457 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2458 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2459 void *tag); 2460 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2461 2462 static int 2463 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2464 { 2465 dsl_dataset_promote_arg_t *ddpa = arg; 2466 dsl_pool_t *dp = dmu_tx_pool(tx); 2467 dsl_dataset_t *hds; 2468 struct promotenode *snap; 2469 dsl_dataset_t *origin_ds; 2470 int err; 2471 uint64_t unused; 2472 uint64_t ss_mv_cnt; 2473 size_t max_snap_len; 2474 2475 err = promote_hold(ddpa, dp, FTAG); 2476 if (err != 0) 2477 return (err); 2478 2479 hds = ddpa->ddpa_clone; 2480 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2481 2482 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2483 promote_rele(ddpa, FTAG); 2484 return (SET_ERROR(EXDEV)); 2485 } 2486 2487 /* 2488 * Compute and check the amount of space to transfer. Since this is 2489 * so expensive, don't do the preliminary check. 2490 */ 2491 if (!dmu_tx_is_syncing(tx)) { 2492 promote_rele(ddpa, FTAG); 2493 return (0); 2494 } 2495 2496 snap = list_head(&ddpa->shared_snaps); 2497 origin_ds = snap->ds; 2498 2499 /* compute origin's new unique space */ 2500 snap = list_tail(&ddpa->clone_snaps); 2501 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2502 origin_ds->ds_object); 2503 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2504 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2505 &ddpa->unique, &unused, &unused); 2506 2507 /* 2508 * Walk the snapshots that we are moving 2509 * 2510 * Compute space to transfer. Consider the incremental changes 2511 * to used by each snapshot: 2512 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2513 * So each snapshot gave birth to: 2514 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2515 * So a sequence would look like: 2516 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2517 * Which simplifies to: 2518 * uN + kN + kN-1 + ... + k1 + k0 2519 * Note however, if we stop before we reach the ORIGIN we get: 2520 * uN + kN + kN-1 + ... + kM - uM-1 2521 */ 2522 ss_mv_cnt = 0; 2523 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2524 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2525 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2526 for (snap = list_head(&ddpa->shared_snaps); snap; 2527 snap = list_next(&ddpa->shared_snaps, snap)) { 2528 uint64_t val, dlused, dlcomp, dluncomp; 2529 dsl_dataset_t *ds = snap->ds; 2530 2531 ss_mv_cnt++; 2532 2533 /* 2534 * If there are long holds, we won't be able to evict 2535 * the objset. 2536 */ 2537 if (dsl_dataset_long_held(ds)) { 2538 err = SET_ERROR(EBUSY); 2539 goto out; 2540 } 2541 2542 /* Check that the snapshot name does not conflict */ 2543 VERIFY0(dsl_dataset_get_snapname(ds)); 2544 if (strlen(ds->ds_snapname) >= max_snap_len) { 2545 err = SET_ERROR(ENAMETOOLONG); 2546 goto out; 2547 } 2548 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2549 if (err == 0) { 2550 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2551 err = SET_ERROR(EEXIST); 2552 goto out; 2553 } 2554 if (err != ENOENT) 2555 goto out; 2556 2557 /* The very first snapshot does not have a deadlist */ 2558 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2559 continue; 2560 2561 dsl_deadlist_space(&ds->ds_deadlist, 2562 &dlused, &dlcomp, &dluncomp); 2563 ddpa->used += dlused; 2564 ddpa->comp += dlcomp; 2565 ddpa->uncomp += dluncomp; 2566 } 2567 2568 /* 2569 * If we are a clone of a clone then we never reached ORIGIN, 2570 * so we need to subtract out the clone origin's used space. 2571 */ 2572 if (ddpa->origin_origin) { 2573 ddpa->used -= 2574 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2575 ddpa->comp -= 2576 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2577 ddpa->uncomp -= 2578 dsl_dataset_phys(ddpa->origin_origin)-> 2579 ds_uncompressed_bytes; 2580 } 2581 2582 /* Check that there is enough space and limit headroom here */ 2583 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2584 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2585 if (err != 0) 2586 goto out; 2587 2588 /* 2589 * Compute the amounts of space that will be used by snapshots 2590 * after the promotion (for both origin and clone). For each, 2591 * it is the amount of space that will be on all of their 2592 * deadlists (that was not born before their new origin). 2593 */ 2594 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2595 uint64_t space; 2596 2597 /* 2598 * Note, typically this will not be a clone of a clone, 2599 * so dd_origin_txg will be < TXG_INITIAL, so 2600 * these snaplist_space() -> dsl_deadlist_space_range() 2601 * calls will be fast because they do not have to 2602 * iterate over all bps. 2603 */ 2604 snap = list_head(&ddpa->origin_snaps); 2605 err = snaplist_space(&ddpa->shared_snaps, 2606 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2607 if (err != 0) 2608 goto out; 2609 2610 err = snaplist_space(&ddpa->clone_snaps, 2611 snap->ds->ds_dir->dd_origin_txg, &space); 2612 if (err != 0) 2613 goto out; 2614 ddpa->cloneusedsnap += space; 2615 } 2616 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2617 DD_FLAG_USED_BREAKDOWN) { 2618 err = snaplist_space(&ddpa->origin_snaps, 2619 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2620 &ddpa->originusedsnap); 2621 if (err != 0) 2622 goto out; 2623 } 2624 2625 out: 2626 promote_rele(ddpa, FTAG); 2627 return (err); 2628 } 2629 2630 static void 2631 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2632 { 2633 dsl_dataset_promote_arg_t *ddpa = arg; 2634 dsl_pool_t *dp = dmu_tx_pool(tx); 2635 dsl_dataset_t *hds; 2636 struct promotenode *snap; 2637 dsl_dataset_t *origin_ds; 2638 dsl_dataset_t *origin_head; 2639 dsl_dir_t *dd; 2640 dsl_dir_t *odd = NULL; 2641 uint64_t oldnext_obj; 2642 int64_t delta; 2643 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL) 2644 char *oldname, *newname; 2645 #endif 2646 2647 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2648 hds = ddpa->ddpa_clone; 2649 2650 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2651 2652 snap = list_head(&ddpa->shared_snaps); 2653 origin_ds = snap->ds; 2654 dd = hds->ds_dir; 2655 2656 snap = list_head(&ddpa->origin_snaps); 2657 origin_head = snap->ds; 2658 2659 /* 2660 * We need to explicitly open odd, since origin_ds's dd will be 2661 * changing. 2662 */ 2663 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2664 NULL, FTAG, &odd)); 2665 2666 /* change origin's next snap */ 2667 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2668 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2669 snap = list_tail(&ddpa->clone_snaps); 2670 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2671 origin_ds->ds_object); 2672 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2673 2674 /* change the origin's next clone */ 2675 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2676 dsl_dataset_remove_from_next_clones(origin_ds, 2677 snap->ds->ds_object, tx); 2678 VERIFY0(zap_add_int(dp->dp_meta_objset, 2679 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2680 oldnext_obj, tx)); 2681 } 2682 2683 /* change origin */ 2684 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2685 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2686 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2687 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2688 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2689 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2690 origin_head->ds_dir->dd_origin_txg = 2691 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2692 2693 /* change dd_clone entries */ 2694 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2695 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2696 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2697 VERIFY0(zap_add_int(dp->dp_meta_objset, 2698 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2699 hds->ds_object, tx)); 2700 2701 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2702 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2703 origin_head->ds_object, tx)); 2704 if (dsl_dir_phys(dd)->dd_clones == 0) { 2705 dsl_dir_phys(dd)->dd_clones = 2706 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2707 DMU_OT_NONE, 0, tx); 2708 } 2709 VERIFY0(zap_add_int(dp->dp_meta_objset, 2710 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2711 } 2712 2713 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL) 2714 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2715 mutex_enter(&spa_namespace_lock); 2716 2717 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2718 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2719 #endif 2720 2721 /* move snapshots to this dir */ 2722 for (snap = list_head(&ddpa->shared_snaps); snap; 2723 snap = list_next(&ddpa->shared_snaps, snap)) { 2724 dsl_dataset_t *ds = snap->ds; 2725 2726 /* 2727 * Property callbacks are registered to a particular 2728 * dsl_dir. Since ours is changing, evict the objset 2729 * so that they will be unregistered from the old dsl_dir. 2730 */ 2731 if (ds->ds_objset) { 2732 dmu_objset_evict(ds->ds_objset); 2733 ds->ds_objset = NULL; 2734 } 2735 2736 /* move snap name entry */ 2737 VERIFY0(dsl_dataset_get_snapname(ds)); 2738 VERIFY0(dsl_dataset_snap_remove(origin_head, 2739 ds->ds_snapname, tx, B_TRUE)); 2740 VERIFY0(zap_add(dp->dp_meta_objset, 2741 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2742 8, 1, &ds->ds_object, tx)); 2743 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2744 DD_FIELD_SNAPSHOT_COUNT, tx); 2745 2746 /* change containing dsl_dir */ 2747 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2748 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2749 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2750 ASSERT3P(ds->ds_dir, ==, odd); 2751 dsl_dir_rele(ds->ds_dir, ds); 2752 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2753 NULL, ds, &ds->ds_dir)); 2754 2755 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL) 2756 dsl_dataset_name(ds, newname); 2757 zfsvfs_update_fromname(oldname, newname); 2758 zvol_rename_minors(oldname, newname); 2759 #endif 2760 2761 /* move any clone references */ 2762 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2763 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2764 zap_cursor_t zc; 2765 zap_attribute_t za; 2766 2767 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2768 dsl_dataset_phys(ds)->ds_next_clones_obj); 2769 zap_cursor_retrieve(&zc, &za) == 0; 2770 zap_cursor_advance(&zc)) { 2771 dsl_dataset_t *cnds; 2772 uint64_t o; 2773 2774 if (za.za_first_integer == oldnext_obj) { 2775 /* 2776 * We've already moved the 2777 * origin's reference. 2778 */ 2779 continue; 2780 } 2781 2782 VERIFY0(dsl_dataset_hold_obj(dp, 2783 za.za_first_integer, FTAG, &cnds)); 2784 o = dsl_dir_phys(cnds->ds_dir)-> 2785 dd_head_dataset_obj; 2786 2787 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2788 dsl_dir_phys(odd)->dd_clones, o, tx)); 2789 VERIFY0(zap_add_int(dp->dp_meta_objset, 2790 dsl_dir_phys(dd)->dd_clones, o, tx)); 2791 dsl_dataset_rele(cnds, FTAG); 2792 } 2793 zap_cursor_fini(&zc); 2794 } 2795 2796 ASSERT(!dsl_prop_hascb(ds)); 2797 } 2798 2799 #if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(_KERNEL) 2800 mutex_exit(&spa_namespace_lock); 2801 2802 kmem_free(newname, MAXPATHLEN); 2803 kmem_free(oldname, MAXPATHLEN); 2804 #endif 2805 /* 2806 * Change space accounting. 2807 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2808 * both be valid, or both be 0 (resulting in delta == 0). This 2809 * is true for each of {clone,origin} independently. 2810 */ 2811 2812 delta = ddpa->cloneusedsnap - 2813 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2814 ASSERT3S(delta, >=, 0); 2815 ASSERT3U(ddpa->used, >=, delta); 2816 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2817 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2818 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2819 2820 delta = ddpa->originusedsnap - 2821 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2822 ASSERT3S(delta, <=, 0); 2823 ASSERT3U(ddpa->used, >=, -delta); 2824 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2825 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2826 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2827 2828 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2829 2830 /* log history record */ 2831 spa_history_log_internal_ds(hds, "promote", tx, ""); 2832 2833 dsl_dir_rele(odd, FTAG); 2834 promote_rele(ddpa, FTAG); 2835 } 2836 2837 /* 2838 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2839 * (exclusive) and last_obj (inclusive). The list will be in reverse 2840 * order (last_obj will be the list_head()). If first_obj == 0, do all 2841 * snapshots back to this dataset's origin. 2842 */ 2843 static int 2844 snaplist_make(dsl_pool_t *dp, 2845 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2846 { 2847 uint64_t obj = last_obj; 2848 2849 list_create(l, sizeof (struct promotenode), 2850 offsetof(struct promotenode, link)); 2851 2852 while (obj != first_obj) { 2853 dsl_dataset_t *ds; 2854 struct promotenode *snap; 2855 int err; 2856 2857 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2858 ASSERT(err != ENOENT); 2859 if (err != 0) 2860 return (err); 2861 2862 if (first_obj == 0) 2863 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2864 2865 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2866 snap->ds = ds; 2867 list_insert_tail(l, snap); 2868 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2869 } 2870 2871 return (0); 2872 } 2873 2874 static int 2875 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2876 { 2877 struct promotenode *snap; 2878 2879 *spacep = 0; 2880 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2881 uint64_t used, comp, uncomp; 2882 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2883 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2884 *spacep += used; 2885 } 2886 return (0); 2887 } 2888 2889 static void 2890 snaplist_destroy(list_t *l, void *tag) 2891 { 2892 struct promotenode *snap; 2893 2894 if (l == NULL || !list_link_active(&l->list_head)) 2895 return; 2896 2897 while ((snap = list_tail(l)) != NULL) { 2898 list_remove(l, snap); 2899 dsl_dataset_rele(snap->ds, tag); 2900 kmem_free(snap, sizeof (*snap)); 2901 } 2902 list_destroy(l); 2903 } 2904 2905 static int 2906 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2907 { 2908 int error; 2909 dsl_dir_t *dd; 2910 struct promotenode *snap; 2911 2912 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2913 &ddpa->ddpa_clone); 2914 if (error != 0) 2915 return (error); 2916 dd = ddpa->ddpa_clone->ds_dir; 2917 2918 if (ddpa->ddpa_clone->ds_is_snapshot || 2919 !dsl_dir_is_clone(dd)) { 2920 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2921 return (SET_ERROR(EINVAL)); 2922 } 2923 2924 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2925 &ddpa->shared_snaps, tag); 2926 if (error != 0) 2927 goto out; 2928 2929 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2930 &ddpa->clone_snaps, tag); 2931 if (error != 0) 2932 goto out; 2933 2934 snap = list_head(&ddpa->shared_snaps); 2935 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2936 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2937 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2938 &ddpa->origin_snaps, tag); 2939 if (error != 0) 2940 goto out; 2941 2942 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2943 error = dsl_dataset_hold_obj(dp, 2944 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2945 tag, &ddpa->origin_origin); 2946 if (error != 0) 2947 goto out; 2948 } 2949 out: 2950 if (error != 0) 2951 promote_rele(ddpa, tag); 2952 return (error); 2953 } 2954 2955 static void 2956 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2957 { 2958 snaplist_destroy(&ddpa->shared_snaps, tag); 2959 snaplist_destroy(&ddpa->clone_snaps, tag); 2960 snaplist_destroy(&ddpa->origin_snaps, tag); 2961 if (ddpa->origin_origin != NULL) 2962 dsl_dataset_rele(ddpa->origin_origin, tag); 2963 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2964 } 2965 2966 /* 2967 * Promote a clone. 2968 * 2969 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2970 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 2971 */ 2972 int 2973 dsl_dataset_promote(const char *name, char *conflsnap) 2974 { 2975 dsl_dataset_promote_arg_t ddpa = { 0 }; 2976 uint64_t numsnaps; 2977 int error; 2978 objset_t *os; 2979 2980 /* 2981 * We will modify space proportional to the number of 2982 * snapshots. Compute numsnaps. 2983 */ 2984 error = dmu_objset_hold(name, FTAG, &os); 2985 if (error != 0) 2986 return (error); 2987 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2988 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2989 &numsnaps); 2990 dmu_objset_rele(os, FTAG); 2991 if (error != 0) 2992 return (error); 2993 2994 ddpa.ddpa_clonename = name; 2995 ddpa.err_ds = conflsnap; 2996 ddpa.cr = CRED(); 2997 2998 return (dsl_sync_task(name, dsl_dataset_promote_check, 2999 dsl_dataset_promote_sync, &ddpa, 3000 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 3001 } 3002 3003 int 3004 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 3005 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 3006 { 3007 /* 3008 * "slack" factor for received datasets with refquota set on them. 3009 * See the bottom of this function for details on its use. 3010 */ 3011 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 3012 int64_t unused_refres_delta; 3013 3014 /* they should both be heads */ 3015 if (clone->ds_is_snapshot || 3016 origin_head->ds_is_snapshot) 3017 return (SET_ERROR(EINVAL)); 3018 3019 /* if we are not forcing, the branch point should be just before them */ 3020 if (!force && clone->ds_prev != origin_head->ds_prev) 3021 return (SET_ERROR(EINVAL)); 3022 3023 /* clone should be the clone (unless they are unrelated) */ 3024 if (clone->ds_prev != NULL && 3025 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 3026 origin_head->ds_dir != clone->ds_prev->ds_dir) 3027 return (SET_ERROR(EINVAL)); 3028 3029 /* the clone should be a child of the origin */ 3030 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 3031 return (SET_ERROR(EINVAL)); 3032 3033 /* origin_head shouldn't be modified unless 'force' */ 3034 if (!force && 3035 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3036 return (SET_ERROR(ETXTBSY)); 3037 3038 /* origin_head should have no long holds (e.g. is not mounted) */ 3039 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3040 return (SET_ERROR(EBUSY)); 3041 3042 /* check amount of any unconsumed refreservation */ 3043 unused_refres_delta = 3044 (int64_t)MIN(origin_head->ds_reserved, 3045 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3046 (int64_t)MIN(origin_head->ds_reserved, 3047 dsl_dataset_phys(clone)->ds_unique_bytes); 3048 3049 if (unused_refres_delta > 0 && 3050 unused_refres_delta > 3051 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3052 return (SET_ERROR(ENOSPC)); 3053 3054 /* 3055 * The clone can't be too much over the head's refquota. 3056 * 3057 * To ensure that the entire refquota can be used, we allow one 3058 * transaction to exceed the the refquota. Therefore, this check 3059 * needs to also allow for the space referenced to be more than the 3060 * refquota. The maximum amount of space that one transaction can use 3061 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3062 * overage ensures that we are able to receive a filesystem that 3063 * exceeds the refquota on the source system. 3064 * 3065 * So that overage is the refquota_slack we use below. 3066 */ 3067 if (origin_head->ds_quota != 0 && 3068 dsl_dataset_phys(clone)->ds_referenced_bytes > 3069 origin_head->ds_quota + refquota_slack) 3070 return (SET_ERROR(EDQUOT)); 3071 3072 return (0); 3073 } 3074 3075 void 3076 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 3077 dsl_dataset_t *origin_head, dmu_tx_t *tx) 3078 { 3079 dsl_pool_t *dp = dmu_tx_pool(tx); 3080 int64_t unused_refres_delta; 3081 3082 ASSERT(clone->ds_reserved == 0); 3083 /* 3084 * NOTE: On DEBUG kernels there could be a race between this and 3085 * the check function if spa_asize_inflation is adjusted... 3086 */ 3087 ASSERT(origin_head->ds_quota == 0 || 3088 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 3089 DMU_MAX_ACCESS * spa_asize_inflation); 3090 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 3091 3092 /* 3093 * Swap per-dataset feature flags. 3094 */ 3095 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 3096 if (!(spa_feature_table[f].fi_flags & 3097 ZFEATURE_FLAG_PER_DATASET)) { 3098 ASSERT(!clone->ds_feature_inuse[f]); 3099 ASSERT(!origin_head->ds_feature_inuse[f]); 3100 continue; 3101 } 3102 3103 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3104 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3105 3106 if (clone_inuse) { 3107 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3108 clone->ds_feature_inuse[f] = B_FALSE; 3109 } 3110 if (origin_head_inuse) { 3111 dsl_dataset_deactivate_feature(origin_head->ds_object, 3112 f, tx); 3113 origin_head->ds_feature_inuse[f] = B_FALSE; 3114 } 3115 if (clone_inuse) { 3116 dsl_dataset_activate_feature(origin_head->ds_object, 3117 f, tx); 3118 origin_head->ds_feature_inuse[f] = B_TRUE; 3119 } 3120 if (origin_head_inuse) { 3121 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3122 clone->ds_feature_inuse[f] = B_TRUE; 3123 } 3124 } 3125 3126 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3127 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3128 3129 if (clone->ds_objset != NULL) { 3130 dmu_objset_evict(clone->ds_objset); 3131 clone->ds_objset = NULL; 3132 } 3133 3134 if (origin_head->ds_objset != NULL) { 3135 dmu_objset_evict(origin_head->ds_objset); 3136 origin_head->ds_objset = NULL; 3137 } 3138 3139 unused_refres_delta = 3140 (int64_t)MIN(origin_head->ds_reserved, 3141 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3142 (int64_t)MIN(origin_head->ds_reserved, 3143 dsl_dataset_phys(clone)->ds_unique_bytes); 3144 3145 /* 3146 * Reset origin's unique bytes, if it exists. 3147 */ 3148 if (clone->ds_prev) { 3149 dsl_dataset_t *origin = clone->ds_prev; 3150 uint64_t comp, uncomp; 3151 3152 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3153 dsl_deadlist_space_range(&clone->ds_deadlist, 3154 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3155 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3156 } 3157 3158 /* swap blkptrs */ 3159 { 3160 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 3161 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 3162 blkptr_t tmp; 3163 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3164 dsl_dataset_phys(origin_head)->ds_bp = 3165 dsl_dataset_phys(clone)->ds_bp; 3166 dsl_dataset_phys(clone)->ds_bp = tmp; 3167 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 3168 rrw_exit(&clone->ds_bp_rwlock, FTAG); 3169 } 3170 3171 /* set dd_*_bytes */ 3172 { 3173 int64_t dused, dcomp, duncomp; 3174 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3175 uint64_t odl_used, odl_comp, odl_uncomp; 3176 3177 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3178 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3179 3180 dsl_deadlist_space(&clone->ds_deadlist, 3181 &cdl_used, &cdl_comp, &cdl_uncomp); 3182 dsl_deadlist_space(&origin_head->ds_deadlist, 3183 &odl_used, &odl_comp, &odl_uncomp); 3184 3185 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3186 cdl_used - 3187 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3188 odl_used); 3189 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3190 cdl_comp - 3191 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3192 odl_comp); 3193 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3194 cdl_uncomp - 3195 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3196 odl_uncomp); 3197 3198 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3199 dused, dcomp, duncomp, tx); 3200 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3201 -dused, -dcomp, -duncomp, tx); 3202 3203 /* 3204 * The difference in the space used by snapshots is the 3205 * difference in snapshot space due to the head's 3206 * deadlist (since that's the only thing that's 3207 * changing that affects the snapused). 3208 */ 3209 dsl_deadlist_space_range(&clone->ds_deadlist, 3210 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3211 &cdl_used, &cdl_comp, &cdl_uncomp); 3212 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3213 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3214 &odl_used, &odl_comp, &odl_uncomp); 3215 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3216 DD_USED_HEAD, DD_USED_SNAP, NULL); 3217 } 3218 3219 /* swap ds_*_bytes */ 3220 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3221 dsl_dataset_phys(clone)->ds_referenced_bytes); 3222 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3223 dsl_dataset_phys(clone)->ds_compressed_bytes); 3224 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3225 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3226 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3227 dsl_dataset_phys(clone)->ds_unique_bytes); 3228 3229 /* apply any parent delta for change in unconsumed refreservation */ 3230 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3231 unused_refres_delta, 0, 0, tx); 3232 3233 /* 3234 * Swap deadlists. 3235 */ 3236 dsl_deadlist_close(&clone->ds_deadlist); 3237 dsl_deadlist_close(&origin_head->ds_deadlist); 3238 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3239 dsl_dataset_phys(clone)->ds_deadlist_obj); 3240 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3241 dsl_dataset_phys(clone)->ds_deadlist_obj); 3242 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3243 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3244 3245 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3246 3247 spa_history_log_internal_ds(clone, "clone swap", tx, 3248 "parent=%s", origin_head->ds_dir->dd_myname); 3249 } 3250 3251 /* 3252 * Given a pool name and a dataset object number in that pool, 3253 * return the name of that dataset. 3254 */ 3255 int 3256 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3257 { 3258 dsl_pool_t *dp; 3259 dsl_dataset_t *ds; 3260 int error; 3261 3262 error = dsl_pool_hold(pname, FTAG, &dp); 3263 if (error != 0) 3264 return (error); 3265 3266 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3267 if (error == 0) { 3268 dsl_dataset_name(ds, buf); 3269 dsl_dataset_rele(ds, FTAG); 3270 } 3271 dsl_pool_rele(dp, FTAG); 3272 3273 return (error); 3274 } 3275 3276 int 3277 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3278 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3279 { 3280 int error = 0; 3281 3282 ASSERT3S(asize, >, 0); 3283 3284 /* 3285 * *ref_rsrv is the portion of asize that will come from any 3286 * unconsumed refreservation space. 3287 */ 3288 *ref_rsrv = 0; 3289 3290 mutex_enter(&ds->ds_lock); 3291 /* 3292 * Make a space adjustment for reserved bytes. 3293 */ 3294 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3295 ASSERT3U(*used, >=, 3296 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3297 *used -= 3298 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3299 *ref_rsrv = 3300 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3301 } 3302 3303 if (!check_quota || ds->ds_quota == 0) { 3304 mutex_exit(&ds->ds_lock); 3305 return (0); 3306 } 3307 /* 3308 * If they are requesting more space, and our current estimate 3309 * is over quota, they get to try again unless the actual 3310 * on-disk is over quota and there are no pending changes (which 3311 * may free up space for us). 3312 */ 3313 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3314 ds->ds_quota) { 3315 if (inflight > 0 || 3316 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3317 error = SET_ERROR(ERESTART); 3318 else 3319 error = SET_ERROR(EDQUOT); 3320 } 3321 mutex_exit(&ds->ds_lock); 3322 3323 return (error); 3324 } 3325 3326 typedef struct dsl_dataset_set_qr_arg { 3327 const char *ddsqra_name; 3328 zprop_source_t ddsqra_source; 3329 uint64_t ddsqra_value; 3330 } dsl_dataset_set_qr_arg_t; 3331 3332 3333 /* ARGSUSED */ 3334 static int 3335 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3336 { 3337 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3338 dsl_pool_t *dp = dmu_tx_pool(tx); 3339 dsl_dataset_t *ds; 3340 int error; 3341 uint64_t newval; 3342 3343 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3344 return (SET_ERROR(ENOTSUP)); 3345 3346 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3347 if (error != 0) 3348 return (error); 3349 3350 if (ds->ds_is_snapshot) { 3351 dsl_dataset_rele(ds, FTAG); 3352 return (SET_ERROR(EINVAL)); 3353 } 3354 3355 error = dsl_prop_predict(ds->ds_dir, 3356 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3357 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3358 if (error != 0) { 3359 dsl_dataset_rele(ds, FTAG); 3360 return (error); 3361 } 3362 3363 if (newval == 0) { 3364 dsl_dataset_rele(ds, FTAG); 3365 return (0); 3366 } 3367 3368 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3369 newval < ds->ds_reserved) { 3370 dsl_dataset_rele(ds, FTAG); 3371 return (SET_ERROR(ENOSPC)); 3372 } 3373 3374 dsl_dataset_rele(ds, FTAG); 3375 return (0); 3376 } 3377 3378 static void 3379 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3380 { 3381 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3382 dsl_pool_t *dp = dmu_tx_pool(tx); 3383 dsl_dataset_t *ds; 3384 uint64_t newval; 3385 3386 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3387 3388 dsl_prop_set_sync_impl(ds, 3389 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3390 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3391 &ddsqra->ddsqra_value, tx); 3392 3393 VERIFY0(dsl_prop_get_int_ds(ds, 3394 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3395 3396 if (ds->ds_quota != newval) { 3397 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3398 ds->ds_quota = newval; 3399 } 3400 dsl_dataset_rele(ds, FTAG); 3401 } 3402 3403 int 3404 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3405 uint64_t refquota) 3406 { 3407 dsl_dataset_set_qr_arg_t ddsqra; 3408 3409 ddsqra.ddsqra_name = dsname; 3410 ddsqra.ddsqra_source = source; 3411 ddsqra.ddsqra_value = refquota; 3412 3413 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3414 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3415 } 3416 3417 static int 3418 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3419 { 3420 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3421 dsl_pool_t *dp = dmu_tx_pool(tx); 3422 dsl_dataset_t *ds; 3423 int error; 3424 uint64_t newval, unique; 3425 3426 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3427 return (SET_ERROR(ENOTSUP)); 3428 3429 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3430 if (error != 0) 3431 return (error); 3432 3433 if (ds->ds_is_snapshot) { 3434 dsl_dataset_rele(ds, FTAG); 3435 return (SET_ERROR(EINVAL)); 3436 } 3437 3438 error = dsl_prop_predict(ds->ds_dir, 3439 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3440 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3441 if (error != 0) { 3442 dsl_dataset_rele(ds, FTAG); 3443 return (error); 3444 } 3445 3446 /* 3447 * If we are doing the preliminary check in open context, the 3448 * space estimates may be inaccurate. 3449 */ 3450 if (!dmu_tx_is_syncing(tx)) { 3451 dsl_dataset_rele(ds, FTAG); 3452 return (0); 3453 } 3454 3455 mutex_enter(&ds->ds_lock); 3456 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3457 dsl_dataset_recalc_head_uniq(ds); 3458 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3459 mutex_exit(&ds->ds_lock); 3460 3461 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3462 uint64_t delta = MAX(unique, newval) - 3463 MAX(unique, ds->ds_reserved); 3464 3465 if (delta > 3466 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3467 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3468 dsl_dataset_rele(ds, FTAG); 3469 return (SET_ERROR(ENOSPC)); 3470 } 3471 } 3472 3473 dsl_dataset_rele(ds, FTAG); 3474 return (0); 3475 } 3476 3477 void 3478 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3479 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3480 { 3481 uint64_t newval; 3482 uint64_t unique; 3483 int64_t delta; 3484 3485 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3486 source, sizeof (value), 1, &value, tx); 3487 3488 VERIFY0(dsl_prop_get_int_ds(ds, 3489 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3490 3491 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3492 mutex_enter(&ds->ds_dir->dd_lock); 3493 mutex_enter(&ds->ds_lock); 3494 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3495 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3496 delta = MAX(0, (int64_t)(newval - unique)) - 3497 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3498 ds->ds_reserved = newval; 3499 mutex_exit(&ds->ds_lock); 3500 3501 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3502 mutex_exit(&ds->ds_dir->dd_lock); 3503 } 3504 3505 static void 3506 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3507 { 3508 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3509 dsl_pool_t *dp = dmu_tx_pool(tx); 3510 dsl_dataset_t *ds; 3511 3512 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3513 dsl_dataset_set_refreservation_sync_impl(ds, 3514 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3515 dsl_dataset_rele(ds, FTAG); 3516 } 3517 3518 int 3519 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3520 uint64_t refreservation) 3521 { 3522 dsl_dataset_set_qr_arg_t ddsqra; 3523 3524 ddsqra.ddsqra_name = dsname; 3525 ddsqra.ddsqra_source = source; 3526 ddsqra.ddsqra_value = refreservation; 3527 3528 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3529 dsl_dataset_set_refreservation_sync, &ddsqra, 3530 0, ZFS_SPACE_CHECK_NONE)); 3531 } 3532 3533 /* 3534 * Return (in *usedp) the amount of space written in new that is not 3535 * present in oldsnap. New may be a snapshot or the head. Old must be 3536 * a snapshot before new, in new's filesystem (or its origin). If not then 3537 * fail and return EINVAL. 3538 * 3539 * The written space is calculated by considering two components: First, we 3540 * ignore any freed space, and calculate the written as new's used space 3541 * minus old's used space. Next, we add in the amount of space that was freed 3542 * between the two snapshots, thus reducing new's used space relative to old's. 3543 * Specifically, this is the space that was born before old->ds_creation_txg, 3544 * and freed before new (ie. on new's deadlist or a previous deadlist). 3545 * 3546 * space freed [---------------------] 3547 * snapshots ---O-------O--------O-------O------ 3548 * oldsnap new 3549 */ 3550 int 3551 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3552 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3553 { 3554 int err = 0; 3555 uint64_t snapobj; 3556 dsl_pool_t *dp = new->ds_dir->dd_pool; 3557 3558 ASSERT(dsl_pool_config_held(dp)); 3559 3560 *usedp = 0; 3561 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3562 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3563 3564 *compp = 0; 3565 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3566 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3567 3568 *uncompp = 0; 3569 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3570 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3571 3572 snapobj = new->ds_object; 3573 while (snapobj != oldsnap->ds_object) { 3574 dsl_dataset_t *snap; 3575 uint64_t used, comp, uncomp; 3576 3577 if (snapobj == new->ds_object) { 3578 snap = new; 3579 } else { 3580 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3581 if (err != 0) 3582 break; 3583 } 3584 3585 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3586 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3587 /* 3588 * The blocks in the deadlist can not be born after 3589 * ds_prev_snap_txg, so get the whole deadlist space, 3590 * which is more efficient (especially for old-format 3591 * deadlists). Unfortunately the deadlist code 3592 * doesn't have enough information to make this 3593 * optimization itself. 3594 */ 3595 dsl_deadlist_space(&snap->ds_deadlist, 3596 &used, &comp, &uncomp); 3597 } else { 3598 dsl_deadlist_space_range(&snap->ds_deadlist, 3599 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3600 &used, &comp, &uncomp); 3601 } 3602 *usedp += used; 3603 *compp += comp; 3604 *uncompp += uncomp; 3605 3606 /* 3607 * If we get to the beginning of the chain of snapshots 3608 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3609 * was not a snapshot of/before new. 3610 */ 3611 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3612 if (snap != new) 3613 dsl_dataset_rele(snap, FTAG); 3614 if (snapobj == 0) { 3615 err = SET_ERROR(EINVAL); 3616 break; 3617 } 3618 3619 } 3620 return (err); 3621 } 3622 3623 /* 3624 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3625 * lastsnap, and all snapshots in between are deleted. 3626 * 3627 * blocks that would be freed [---------------------------] 3628 * snapshots ---O-------O--------O-------O--------O 3629 * firstsnap lastsnap 3630 * 3631 * This is the set of blocks that were born after the snap before firstsnap, 3632 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3633 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3634 * We calculate this by iterating over the relevant deadlists (from the snap 3635 * after lastsnap, backward to the snap after firstsnap), summing up the 3636 * space on the deadlist that was born after the snap before firstsnap. 3637 */ 3638 int 3639 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3640 dsl_dataset_t *lastsnap, 3641 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3642 { 3643 int err = 0; 3644 uint64_t snapobj; 3645 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3646 3647 ASSERT(firstsnap->ds_is_snapshot); 3648 ASSERT(lastsnap->ds_is_snapshot); 3649 3650 /* 3651 * Check that the snapshots are in the same dsl_dir, and firstsnap 3652 * is before lastsnap. 3653 */ 3654 if (firstsnap->ds_dir != lastsnap->ds_dir || 3655 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3656 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3657 return (SET_ERROR(EINVAL)); 3658 3659 *usedp = *compp = *uncompp = 0; 3660 3661 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3662 while (snapobj != firstsnap->ds_object) { 3663 dsl_dataset_t *ds; 3664 uint64_t used, comp, uncomp; 3665 3666 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3667 if (err != 0) 3668 break; 3669 3670 dsl_deadlist_space_range(&ds->ds_deadlist, 3671 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3672 &used, &comp, &uncomp); 3673 *usedp += used; 3674 *compp += comp; 3675 *uncompp += uncomp; 3676 3677 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3678 ASSERT3U(snapobj, !=, 0); 3679 dsl_dataset_rele(ds, FTAG); 3680 } 3681 return (err); 3682 } 3683 3684 /* 3685 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3686 * For example, they could both be snapshots of the same filesystem, and 3687 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3688 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3689 * filesystem. Or 'earlier' could be the origin's origin. 3690 * 3691 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3692 */ 3693 boolean_t 3694 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3695 uint64_t earlier_txg) 3696 { 3697 dsl_pool_t *dp = later->ds_dir->dd_pool; 3698 int error; 3699 boolean_t ret; 3700 3701 ASSERT(dsl_pool_config_held(dp)); 3702 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3703 3704 if (earlier_txg == 0) 3705 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3706 3707 if (later->ds_is_snapshot && 3708 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3709 return (B_FALSE); 3710 3711 if (later->ds_dir == earlier->ds_dir) 3712 return (B_TRUE); 3713 if (!dsl_dir_is_clone(later->ds_dir)) 3714 return (B_FALSE); 3715 3716 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3717 return (B_TRUE); 3718 dsl_dataset_t *origin; 3719 error = dsl_dataset_hold_obj(dp, 3720 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3721 if (error != 0) 3722 return (B_FALSE); 3723 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3724 dsl_dataset_rele(origin, FTAG); 3725 return (ret); 3726 } 3727 3728 void 3729 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3730 { 3731 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3732 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3733 } 3734 3735 boolean_t 3736 dsl_dataset_is_zapified(dsl_dataset_t *ds) 3737 { 3738 dmu_object_info_t doi; 3739 3740 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3741 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3742 } 3743 3744 boolean_t 3745 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3746 { 3747 return (dsl_dataset_is_zapified(ds) && 3748 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3749 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3750 } 3751
Indexes created Tue May 26 00:24:38 UTC 2026