dsl_dataset.c revision 307122
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@FreeBSD.org> 24 * Copyright (c) 2011, 2015 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 62SYSCTL_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 */ 73int zfs_max_recordsize = 1 * 1024 * 1024; 74SYSCTL_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 87extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 88 89extern int spa_asize_inflation; 90 91/* 92 * Figure out how much of this delta should be propogated to the dsl_dir 93 * layer. If there's a refreservation, that space has already been 94 * partially accounted for in our ancestors. 95 */ 96static int64_t 97parent_delta(dsl_dataset_t *ds, int64_t delta) 98{ 99 dsl_dataset_phys_t *ds_phys; 100 uint64_t old_bytes, new_bytes; 101 102 if (ds->ds_reserved == 0) 103 return (delta); 104 105 ds_phys = dsl_dataset_phys(ds); 106 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 107 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 108 109 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 110 return (new_bytes - old_bytes); 111} 112 113void 114dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 115{ 116 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 117 int compressed = BP_GET_PSIZE(bp); 118 int uncompressed = BP_GET_UCSIZE(bp); 119 int64_t delta; 120 121 dprintf_bp(bp, "ds=%p", ds); 122 123 ASSERT(dmu_tx_is_syncing(tx)); 124 /* It could have been compressed away to nothing */ 125 if (BP_IS_HOLE(bp)) 126 return; 127 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 128 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 129 if (ds == NULL) { 130 dsl_pool_mos_diduse_space(tx->tx_pool, 131 used, compressed, uncompressed); 132 return; 133 } 134 135 dmu_buf_will_dirty(ds->ds_dbuf, tx); 136 mutex_enter(&ds->ds_lock); 137 delta = parent_delta(ds, used); 138 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 139 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 140 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 141 dsl_dataset_phys(ds)->ds_unique_bytes += used; 142 143 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 144 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 145 B_TRUE; 146 } 147 148 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 149 if (f != SPA_FEATURE_NONE) 150 ds->ds_feature_activation_needed[f] = B_TRUE; 151 152 mutex_exit(&ds->ds_lock); 153 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 154 compressed, uncompressed, tx); 155 dsl_dir_transfer_space(ds->ds_dir, used - delta, 156 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 157} 158 159int 160dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 161 boolean_t async) 162{ 163 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 164 int compressed = BP_GET_PSIZE(bp); 165 int uncompressed = BP_GET_UCSIZE(bp); 166 167 if (BP_IS_HOLE(bp)) 168 return (0); 169 170 ASSERT(dmu_tx_is_syncing(tx)); 171 ASSERT(bp->blk_birth <= tx->tx_txg); 172 173 if (ds == NULL) { 174 dsl_free(tx->tx_pool, tx->tx_txg, bp); 175 dsl_pool_mos_diduse_space(tx->tx_pool, 176 -used, -compressed, -uncompressed); 177 return (used); 178 } 179 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 180 181 ASSERT(!ds->ds_is_snapshot); 182 dmu_buf_will_dirty(ds->ds_dbuf, tx); 183 184 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 185 int64_t delta; 186 187 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 188 dsl_free(tx->tx_pool, tx->tx_txg, bp); 189 190 mutex_enter(&ds->ds_lock); 191 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 192 !DS_UNIQUE_IS_ACCURATE(ds)); 193 delta = parent_delta(ds, -used); 194 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 195 mutex_exit(&ds->ds_lock); 196 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 197 delta, -compressed, -uncompressed, tx); 198 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 199 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 200 } else { 201 dprintf_bp(bp, "putting on dead list: %s", ""); 202 if (async) { 203 /* 204 * We are here as part of zio's write done callback, 205 * which means we're a zio interrupt thread. We can't 206 * call dsl_deadlist_insert() now because it may block 207 * waiting for I/O. Instead, put bp on the deferred 208 * queue and let dsl_pool_sync() finish the job. 209 */ 210 bplist_append(&ds->ds_pending_deadlist, bp); 211 } else { 212 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 213 } 214 ASSERT3U(ds->ds_prev->ds_object, ==, 215 dsl_dataset_phys(ds)->ds_prev_snap_obj); 216 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 217 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 218 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 219 ds->ds_object && bp->blk_birth > 220 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 221 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 222 mutex_enter(&ds->ds_prev->ds_lock); 223 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 224 mutex_exit(&ds->ds_prev->ds_lock); 225 } 226 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 227 dsl_dir_transfer_space(ds->ds_dir, used, 228 DD_USED_HEAD, DD_USED_SNAP, tx); 229 } 230 } 231 mutex_enter(&ds->ds_lock); 232 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 233 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 234 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 235 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 236 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 237 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 238 mutex_exit(&ds->ds_lock); 239 240 return (used); 241} 242 243uint64_t 244dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 245{ 246 uint64_t trysnap = 0; 247 248 if (ds == NULL) 249 return (0); 250 /* 251 * The snapshot creation could fail, but that would cause an 252 * incorrect FALSE return, which would only result in an 253 * overestimation of the amount of space that an operation would 254 * consume, which is OK. 255 * 256 * There's also a small window where we could miss a pending 257 * snapshot, because we could set the sync task in the quiescing 258 * phase. So this should only be used as a guess. 259 */ 260 if (ds->ds_trysnap_txg > 261 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 262 trysnap = ds->ds_trysnap_txg; 263 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 264} 265 266boolean_t 267dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 268 uint64_t blk_birth) 269{ 270 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 271 (bp != NULL && BP_IS_HOLE(bp))) 272 return (B_FALSE); 273 274 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 275 276 return (B_TRUE); 277} 278 279static void 280dsl_dataset_evict(void *dbu) 281{ 282 dsl_dataset_t *ds = dbu; 283 284 ASSERT(ds->ds_owner == NULL); 285 286 ds->ds_dbuf = NULL; 287 288 unique_remove(ds->ds_fsid_guid); 289 290 if (ds->ds_objset != NULL) 291 dmu_objset_evict(ds->ds_objset); 292 293 if (ds->ds_prev) { 294 dsl_dataset_rele(ds->ds_prev, ds); 295 ds->ds_prev = NULL; 296 } 297 298 bplist_destroy(&ds->ds_pending_deadlist); 299 if (ds->ds_deadlist.dl_os != NULL) 300 dsl_deadlist_close(&ds->ds_deadlist); 301 if (ds->ds_dir) 302 dsl_dir_async_rele(ds->ds_dir, ds); 303 304 ASSERT(!list_link_active(&ds->ds_synced_link)); 305 306 list_destroy(&ds->ds_prop_cbs); 307 if (mutex_owned(&ds->ds_lock)) 308 mutex_exit(&ds->ds_lock); 309 mutex_destroy(&ds->ds_lock); 310 if (mutex_owned(&ds->ds_opening_lock)) 311 mutex_exit(&ds->ds_opening_lock); 312 mutex_destroy(&ds->ds_opening_lock); 313 mutex_destroy(&ds->ds_sendstream_lock); 314 refcount_destroy(&ds->ds_longholds); 315 316 kmem_free(ds, sizeof (dsl_dataset_t)); 317} 318 319int 320dsl_dataset_get_snapname(dsl_dataset_t *ds) 321{ 322 dsl_dataset_phys_t *headphys; 323 int err; 324 dmu_buf_t *headdbuf; 325 dsl_pool_t *dp = ds->ds_dir->dd_pool; 326 objset_t *mos = dp->dp_meta_objset; 327 328 if (ds->ds_snapname[0]) 329 return (0); 330 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 331 return (0); 332 333 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 334 FTAG, &headdbuf); 335 if (err != 0) 336 return (err); 337 headphys = headdbuf->db_data; 338 err = zap_value_search(dp->dp_meta_objset, 339 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 340 dmu_buf_rele(headdbuf, FTAG); 341 return (err); 342} 343 344int 345dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 346{ 347 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 348 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 349 matchtype_t mt; 350 int err; 351 352 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 353 mt = MT_FIRST; 354 else 355 mt = MT_EXACT; 356 357 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 358 value, mt, NULL, 0, NULL); 359 if (err == ENOTSUP && mt == MT_FIRST) 360 err = zap_lookup(mos, snapobj, name, 8, 1, value); 361 return (err); 362} 363 364int 365dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 366 boolean_t adj_cnt) 367{ 368 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 369 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 370 matchtype_t mt; 371 int err; 372 373 dsl_dir_snap_cmtime_update(ds->ds_dir); 374 375 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 376 mt = MT_FIRST; 377 else 378 mt = MT_EXACT; 379 380 err = zap_remove_norm(mos, snapobj, name, mt, tx); 381 if (err == ENOTSUP && mt == MT_FIRST) 382 err = zap_remove(mos, snapobj, name, tx); 383 384 if (err == 0 && adj_cnt) 385 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 386 DD_FIELD_SNAPSHOT_COUNT, tx); 387 388 return (err); 389} 390 391boolean_t 392dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 393{ 394 dmu_buf_t *dbuf = ds->ds_dbuf; 395 boolean_t result = B_FALSE; 396 397 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 398 ds->ds_object, DMU_BONUS_BLKID, tag)) { 399 400 if (ds == dmu_buf_get_user(dbuf)) 401 result = B_TRUE; 402 else 403 dmu_buf_rele(dbuf, tag); 404 } 405 406 return (result); 407} 408 409int 410dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 411 dsl_dataset_t **dsp) 412{ 413 objset_t *mos = dp->dp_meta_objset; 414 dmu_buf_t *dbuf; 415 dsl_dataset_t *ds; 416 int err; 417 dmu_object_info_t doi; 418 419 ASSERT(dsl_pool_config_held(dp)); 420 421 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 422 if (err != 0) 423 return (err); 424 425 /* Make sure dsobj has the correct object type. */ 426 dmu_object_info_from_db(dbuf, &doi); 427 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 428 dmu_buf_rele(dbuf, tag); 429 return (SET_ERROR(EINVAL)); 430 } 431 432 ds = dmu_buf_get_user(dbuf); 433 if (ds == NULL) { 434 dsl_dataset_t *winner = NULL; 435 436 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 437 ds->ds_dbuf = dbuf; 438 ds->ds_object = dsobj; 439 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 440 441 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 442 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 443 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 444 refcount_create(&ds->ds_longholds); 445 446 bplist_create(&ds->ds_pending_deadlist); 447 dsl_deadlist_open(&ds->ds_deadlist, 448 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 449 450 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 451 offsetof(dmu_sendarg_t, dsa_link)); 452 453 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 454 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 455 456 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 457 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 458 if (!(spa_feature_table[f].fi_flags & 459 ZFEATURE_FLAG_PER_DATASET)) 460 continue; 461 err = zap_contains(mos, dsobj, 462 spa_feature_table[f].fi_guid); 463 if (err == 0) { 464 ds->ds_feature_inuse[f] = B_TRUE; 465 } else { 466 ASSERT3U(err, ==, ENOENT); 467 err = 0; 468 } 469 } 470 } 471 472 err = dsl_dir_hold_obj(dp, 473 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 474 if (err != 0) { 475 mutex_destroy(&ds->ds_lock); 476 mutex_destroy(&ds->ds_opening_lock); 477 mutex_destroy(&ds->ds_sendstream_lock); 478 refcount_destroy(&ds->ds_longholds); 479 bplist_destroy(&ds->ds_pending_deadlist); 480 dsl_deadlist_close(&ds->ds_deadlist); 481 kmem_free(ds, sizeof (dsl_dataset_t)); 482 dmu_buf_rele(dbuf, tag); 483 return (err); 484 } 485 486 if (!ds->ds_is_snapshot) { 487 ds->ds_snapname[0] = '\0'; 488 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 489 err = dsl_dataset_hold_obj(dp, 490 dsl_dataset_phys(ds)->ds_prev_snap_obj, 491 ds, &ds->ds_prev); 492 } 493 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 494 int zaperr = zap_lookup(mos, ds->ds_object, 495 DS_FIELD_BOOKMARK_NAMES, 496 sizeof (ds->ds_bookmarks), 1, 497 &ds->ds_bookmarks); 498 if (zaperr != ENOENT) 499 VERIFY0(zaperr); 500 } 501 } else { 502 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 503 err = dsl_dataset_get_snapname(ds); 504 if (err == 0 && 505 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 506 err = zap_count( 507 ds->ds_dir->dd_pool->dp_meta_objset, 508 dsl_dataset_phys(ds)->ds_userrefs_obj, 509 &ds->ds_userrefs); 510 } 511 } 512 513 if (err == 0 && !ds->ds_is_snapshot) { 514 err = dsl_prop_get_int_ds(ds, 515 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 516 &ds->ds_reserved); 517 if (err == 0) { 518 err = dsl_prop_get_int_ds(ds, 519 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 520 &ds->ds_quota); 521 } 522 } else { 523 ds->ds_reserved = ds->ds_quota = 0; 524 } 525 526 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 527 if (err == 0) 528 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 529 530 if (err != 0 || winner != NULL) { 531 bplist_destroy(&ds->ds_pending_deadlist); 532 dsl_deadlist_close(&ds->ds_deadlist); 533 if (ds->ds_prev) 534 dsl_dataset_rele(ds->ds_prev, ds); 535 dsl_dir_rele(ds->ds_dir, ds); 536 mutex_destroy(&ds->ds_lock); 537 mutex_destroy(&ds->ds_opening_lock); 538 mutex_destroy(&ds->ds_sendstream_lock); 539 refcount_destroy(&ds->ds_longholds); 540 kmem_free(ds, sizeof (dsl_dataset_t)); 541 if (err != 0) { 542 dmu_buf_rele(dbuf, tag); 543 return (err); 544 } 545 ds = winner; 546 } else { 547 ds->ds_fsid_guid = 548 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 549 } 550 } 551 ASSERT3P(ds->ds_dbuf, ==, dbuf); 552 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 553 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 554 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 555 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 556 *dsp = ds; 557 return (0); 558} 559 560int 561dsl_dataset_hold(dsl_pool_t *dp, const char *name, 562 void *tag, dsl_dataset_t **dsp) 563{ 564 dsl_dir_t *dd; 565 const char *snapname; 566 uint64_t obj; 567 int err = 0; 568 dsl_dataset_t *ds; 569 570 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 571 if (err != 0) 572 return (err); 573 574 ASSERT(dsl_pool_config_held(dp)); 575 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 576 if (obj != 0) 577 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 578 else 579 err = SET_ERROR(ENOENT); 580 581 /* we may be looking for a snapshot */ 582 if (err == 0 && snapname != NULL) { 583 dsl_dataset_t *snap_ds; 584 585 if (*snapname++ != '@') { 586 dsl_dataset_rele(ds, tag); 587 dsl_dir_rele(dd, FTAG); 588 return (SET_ERROR(ENOENT)); 589 } 590 591 dprintf("looking for snapshot '%s'\n", snapname); 592 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 593 if (err == 0) 594 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 595 dsl_dataset_rele(ds, tag); 596 597 if (err == 0) { 598 mutex_enter(&snap_ds->ds_lock); 599 if (snap_ds->ds_snapname[0] == 0) 600 (void) strlcpy(snap_ds->ds_snapname, snapname, 601 sizeof (snap_ds->ds_snapname)); 602 mutex_exit(&snap_ds->ds_lock); 603 ds = snap_ds; 604 } 605 } 606 if (err == 0) 607 *dsp = ds; 608 dsl_dir_rele(dd, FTAG); 609 return (err); 610} 611 612int 613dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 614 void *tag, dsl_dataset_t **dsp) 615{ 616 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 617 if (err != 0) 618 return (err); 619 if (!dsl_dataset_tryown(*dsp, tag)) { 620 dsl_dataset_rele(*dsp, tag); 621 *dsp = NULL; 622 return (SET_ERROR(EBUSY)); 623 } 624 return (0); 625} 626 627int 628dsl_dataset_own(dsl_pool_t *dp, const char *name, 629 void *tag, dsl_dataset_t **dsp) 630{ 631 int err = dsl_dataset_hold(dp, name, tag, dsp); 632 if (err != 0) 633 return (err); 634 if (!dsl_dataset_tryown(*dsp, tag)) { 635 dsl_dataset_rele(*dsp, tag); 636 return (SET_ERROR(EBUSY)); 637 } 638 return (0); 639} 640 641/* 642 * See the comment above dsl_pool_hold() for details. In summary, a long 643 * hold is used to prevent destruction of a dataset while the pool hold 644 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 645 * 646 * The dataset and pool must be held when this function is called. After it 647 * is called, the pool hold may be released while the dataset is still held 648 * and accessed. 649 */ 650void 651dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 652{ 653 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 654 (void) refcount_add(&ds->ds_longholds, tag); 655} 656 657void 658dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 659{ 660 (void) refcount_remove(&ds->ds_longholds, tag); 661} 662 663/* Return B_TRUE if there are any long holds on this dataset. */ 664boolean_t 665dsl_dataset_long_held(dsl_dataset_t *ds) 666{ 667 return (!refcount_is_zero(&ds->ds_longholds)); 668} 669 670void 671dsl_dataset_name(dsl_dataset_t *ds, char *name) 672{ 673 if (ds == NULL) { 674 (void) strcpy(name, "mos"); 675 } else { 676 dsl_dir_name(ds->ds_dir, name); 677 VERIFY0(dsl_dataset_get_snapname(ds)); 678 if (ds->ds_snapname[0]) { 679 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 680 <, ZFS_MAX_DATASET_NAME_LEN); 681 /* 682 * We use a "recursive" mutex so that we 683 * can call dprintf_ds() with ds_lock held. 684 */ 685 if (!MUTEX_HELD(&ds->ds_lock)) { 686 mutex_enter(&ds->ds_lock); 687 VERIFY3U(strlcat(name, ds->ds_snapname, 688 ZFS_MAX_DATASET_NAME_LEN), <, 689 ZFS_MAX_DATASET_NAME_LEN); 690 mutex_exit(&ds->ds_lock); 691 } else { 692 VERIFY3U(strlcat(name, ds->ds_snapname, 693 ZFS_MAX_DATASET_NAME_LEN), <, 694 ZFS_MAX_DATASET_NAME_LEN); 695 } 696 } 697 } 698} 699 700int 701dsl_dataset_namelen(dsl_dataset_t *ds) 702{ 703 VERIFY0(dsl_dataset_get_snapname(ds)); 704 mutex_enter(&ds->ds_lock); 705 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 706 mutex_exit(&ds->ds_lock); 707 return (len); 708} 709 710void 711dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 712{ 713 dmu_buf_rele(ds->ds_dbuf, tag); 714} 715 716void 717dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 718{ 719 ASSERT3P(ds->ds_owner, ==, tag); 720 ASSERT(ds->ds_dbuf != NULL); 721 722 mutex_enter(&ds->ds_lock); 723 ds->ds_owner = NULL; 724 mutex_exit(&ds->ds_lock); 725 dsl_dataset_long_rele(ds, tag); 726 dsl_dataset_rele(ds, tag); 727} 728 729boolean_t 730dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 731{ 732 boolean_t gotit = FALSE; 733 734 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 735 mutex_enter(&ds->ds_lock); 736 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 737 ds->ds_owner = tag; 738 dsl_dataset_long_hold(ds, tag); 739 gotit = TRUE; 740 } 741 mutex_exit(&ds->ds_lock); 742 return (gotit); 743} 744 745boolean_t 746dsl_dataset_has_owner(dsl_dataset_t *ds) 747{ 748 boolean_t rv; 749 mutex_enter(&ds->ds_lock); 750 rv = (ds->ds_owner != NULL); 751 mutex_exit(&ds->ds_lock); 752 return (rv); 753} 754 755static void 756dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 757{ 758 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 759 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 760 uint64_t zero = 0; 761 762 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 763 764 spa_feature_incr(spa, f, tx); 765 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 766 767 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 768 sizeof (zero), 1, &zero, tx)); 769} 770 771void 772dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 773{ 774 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 775 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 776 777 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 778 779 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 780 spa_feature_decr(spa, f, tx); 781} 782 783uint64_t 784dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 785 uint64_t flags, dmu_tx_t *tx) 786{ 787 dsl_pool_t *dp = dd->dd_pool; 788 dmu_buf_t *dbuf; 789 dsl_dataset_phys_t *dsphys; 790 uint64_t dsobj; 791 objset_t *mos = dp->dp_meta_objset; 792 793 if (origin == NULL) 794 origin = dp->dp_origin_snap; 795 796 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 797 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 798 ASSERT(dmu_tx_is_syncing(tx)); 799 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 800 801 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 802 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 803 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 804 dmu_buf_will_dirty(dbuf, tx); 805 dsphys = dbuf->db_data; 806 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 807 dsphys->ds_dir_obj = dd->dd_object; 808 dsphys->ds_flags = flags; 809 dsphys->ds_fsid_guid = unique_create(); 810 do { 811 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 812 sizeof (dsphys->ds_guid)); 813 } while (dsphys->ds_guid == 0); 814 dsphys->ds_snapnames_zapobj = 815 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 816 DMU_OT_NONE, 0, tx); 817 dsphys->ds_creation_time = gethrestime_sec(); 818 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 819 820 if (origin == NULL) { 821 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 822 } else { 823 dsl_dataset_t *ohds; /* head of the origin snapshot */ 824 825 dsphys->ds_prev_snap_obj = origin->ds_object; 826 dsphys->ds_prev_snap_txg = 827 dsl_dataset_phys(origin)->ds_creation_txg; 828 dsphys->ds_referenced_bytes = 829 dsl_dataset_phys(origin)->ds_referenced_bytes; 830 dsphys->ds_compressed_bytes = 831 dsl_dataset_phys(origin)->ds_compressed_bytes; 832 dsphys->ds_uncompressed_bytes = 833 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 834 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 835 836 /* 837 * Inherit flags that describe the dataset's contents 838 * (INCONSISTENT) or properties (Case Insensitive). 839 */ 840 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 841 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 842 843 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 844 if (origin->ds_feature_inuse[f]) 845 dsl_dataset_activate_feature(dsobj, f, tx); 846 } 847 848 dmu_buf_will_dirty(origin->ds_dbuf, tx); 849 dsl_dataset_phys(origin)->ds_num_children++; 850 851 VERIFY0(dsl_dataset_hold_obj(dp, 852 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 853 FTAG, &ohds)); 854 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 855 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 856 dsl_dataset_rele(ohds, FTAG); 857 858 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 859 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 860 dsl_dataset_phys(origin)->ds_next_clones_obj = 861 zap_create(mos, 862 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 863 } 864 VERIFY0(zap_add_int(mos, 865 dsl_dataset_phys(origin)->ds_next_clones_obj, 866 dsobj, tx)); 867 } 868 869 dmu_buf_will_dirty(dd->dd_dbuf, tx); 870 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 871 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 872 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 873 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 874 dsl_dir_phys(origin->ds_dir)->dd_clones = 875 zap_create(mos, 876 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 877 } 878 VERIFY0(zap_add_int(mos, 879 dsl_dir_phys(origin->ds_dir)->dd_clones, 880 dsobj, tx)); 881 } 882 } 883 884 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 885 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 886 887 dmu_buf_rele(dbuf, FTAG); 888 889 dmu_buf_will_dirty(dd->dd_dbuf, tx); 890 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 891 892 return (dsobj); 893} 894 895static void 896dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 897{ 898 objset_t *os; 899 900 VERIFY0(dmu_objset_from_ds(ds, &os)); 901 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 902 dsl_dataset_dirty(ds, tx); 903} 904 905uint64_t 906dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 907 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 908{ 909 dsl_pool_t *dp = pdd->dd_pool; 910 uint64_t dsobj, ddobj; 911 dsl_dir_t *dd; 912 913 ASSERT(dmu_tx_is_syncing(tx)); 914 ASSERT(lastname[0] != '@'); 915 916 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 917 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 918 919 dsobj = dsl_dataset_create_sync_dd(dd, origin, 920 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 921 922 dsl_deleg_set_create_perms(dd, tx, cr); 923 924 /* 925 * Since we're creating a new node we know it's a leaf, so we can 926 * initialize the counts if the limit feature is active. 927 */ 928 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 929 uint64_t cnt = 0; 930 objset_t *os = dd->dd_pool->dp_meta_objset; 931 932 dsl_dir_zapify(dd, tx); 933 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 934 sizeof (cnt), 1, &cnt, tx)); 935 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 936 sizeof (cnt), 1, &cnt, tx)); 937 } 938 939 dsl_dir_rele(dd, FTAG); 940 941 /* 942 * If we are creating a clone, make sure we zero out any stale 943 * data from the origin snapshots zil header. 944 */ 945 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 946 dsl_dataset_t *ds; 947 948 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 949 dsl_dataset_zero_zil(ds, tx); 950 dsl_dataset_rele(ds, FTAG); 951 } 952 953 return (dsobj); 954} 955 956#ifdef __FreeBSD__ 957/* FreeBSD ioctl compat begin */ 958struct destroyarg { 959 nvlist_t *nvl; 960 const char *snapname; 961}; 962 963static int 964dsl_check_snap_cb(const char *name, void *arg) 965{ 966 struct destroyarg *da = arg; 967 dsl_dataset_t *ds; 968 char *dsname; 969 970 dsname = kmem_asprintf("%s@%s", name, da->snapname); 971 fnvlist_add_boolean(da->nvl, dsname); 972 kmem_free(dsname, strlen(dsname) + 1); 973 974 return (0); 975} 976 977int 978dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 979 nvlist_t *snaps) 980{ 981 struct destroyarg *da; 982 int err; 983 984 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 985 da->nvl = snaps; 986 da->snapname = snapname; 987 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 988 DS_FIND_CHILDREN); 989 kmem_free(da, sizeof (struct destroyarg)); 990 991 return (err); 992} 993/* FreeBSD ioctl compat end */ 994#endif /* __FreeBSD__ */ 995 996/* 997 * The unique space in the head dataset can be calculated by subtracting 998 * the space used in the most recent snapshot, that is still being used 999 * in this file system, from the space currently in use. To figure out 1000 * the space in the most recent snapshot still in use, we need to take 1001 * the total space used in the snapshot and subtract out the space that 1002 * has been freed up since the snapshot was taken. 1003 */ 1004void 1005dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1006{ 1007 uint64_t mrs_used; 1008 uint64_t dlused, dlcomp, dluncomp; 1009 1010 ASSERT(!ds->ds_is_snapshot); 1011 1012 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1013 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1014 else 1015 mrs_used = 0; 1016 1017 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1018 1019 ASSERT3U(dlused, <=, mrs_used); 1020 dsl_dataset_phys(ds)->ds_unique_bytes = 1021 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1022 1023 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1024 SPA_VERSION_UNIQUE_ACCURATE) 1025 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1026} 1027 1028void 1029dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1030 dmu_tx_t *tx) 1031{ 1032 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1033 uint64_t count; 1034 int err; 1035 1036 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1037 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1038 obj, tx); 1039 /* 1040 * The err should not be ENOENT, but a bug in a previous version 1041 * of the code could cause upgrade_clones_cb() to not set 1042 * ds_next_snap_obj when it should, leading to a missing entry. 1043 * If we knew that the pool was created after 1044 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1045 * ENOENT. However, at least we can check that we don't have 1046 * too many entries in the next_clones_obj even after failing to 1047 * remove this one. 1048 */ 1049 if (err != ENOENT) 1050 VERIFY0(err); 1051 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1052 &count)); 1053 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1054} 1055 1056 1057blkptr_t * 1058dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1059{ 1060 return (&dsl_dataset_phys(ds)->ds_bp); 1061} 1062 1063void 1064dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1065{ 1066 ASSERT(dmu_tx_is_syncing(tx)); 1067 /* If it's the meta-objset, set dp_meta_rootbp */ 1068 if (ds == NULL) { 1069 tx->tx_pool->dp_meta_rootbp = *bp; 1070 } else { 1071 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1072 dsl_dataset_phys(ds)->ds_bp = *bp; 1073 } 1074} 1075 1076spa_t * 1077dsl_dataset_get_spa(dsl_dataset_t *ds) 1078{ 1079 return (ds->ds_dir->dd_pool->dp_spa); 1080} 1081 1082void 1083dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1084{ 1085 dsl_pool_t *dp; 1086 1087 if (ds == NULL) /* this is the meta-objset */ 1088 return; 1089 1090 ASSERT(ds->ds_objset != NULL); 1091 1092 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1093 panic("dirtying snapshot!"); 1094 1095 dp = ds->ds_dir->dd_pool; 1096 1097 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1098 /* up the hold count until we can be written out */ 1099 dmu_buf_add_ref(ds->ds_dbuf, ds); 1100 } 1101} 1102 1103boolean_t 1104dsl_dataset_is_dirty(dsl_dataset_t *ds) 1105{ 1106 for (int t = 0; t < TXG_SIZE; t++) { 1107 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1108 ds, t)) 1109 return (B_TRUE); 1110 } 1111 return (B_FALSE); 1112} 1113 1114static int 1115dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1116{ 1117 uint64_t asize; 1118 1119 if (!dmu_tx_is_syncing(tx)) 1120 return (0); 1121 1122 /* 1123 * If there's an fs-only reservation, any blocks that might become 1124 * owned by the snapshot dataset must be accommodated by space 1125 * outside of the reservation. 1126 */ 1127 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1128 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1129 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1130 return (SET_ERROR(ENOSPC)); 1131 1132 /* 1133 * Propagate any reserved space for this snapshot to other 1134 * snapshot checks in this sync group. 1135 */ 1136 if (asize > 0) 1137 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1138 1139 return (0); 1140} 1141 1142typedef struct dsl_dataset_snapshot_arg { 1143 nvlist_t *ddsa_snaps; 1144 nvlist_t *ddsa_props; 1145 nvlist_t *ddsa_errors; 1146 cred_t *ddsa_cr; 1147} dsl_dataset_snapshot_arg_t; 1148 1149int 1150dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1151 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1152{ 1153 int error; 1154 uint64_t value; 1155 1156 ds->ds_trysnap_txg = tx->tx_txg; 1157 1158 if (!dmu_tx_is_syncing(tx)) 1159 return (0); 1160 1161 /* 1162 * We don't allow multiple snapshots of the same txg. If there 1163 * is already one, try again. 1164 */ 1165 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1166 return (SET_ERROR(EAGAIN)); 1167 1168 /* 1169 * Check for conflicting snapshot name. 1170 */ 1171 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1172 if (error == 0) 1173 return (SET_ERROR(EEXIST)); 1174 if (error != ENOENT) 1175 return (error); 1176 1177 /* 1178 * We don't allow taking snapshots of inconsistent datasets, such as 1179 * those into which we are currently receiving. However, if we are 1180 * creating this snapshot as part of a receive, this check will be 1181 * executed atomically with respect to the completion of the receive 1182 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1183 * case we ignore this, knowing it will be fixed up for us shortly in 1184 * dmu_recv_end_sync(). 1185 */ 1186 if (!recv && DS_IS_INCONSISTENT(ds)) 1187 return (SET_ERROR(EBUSY)); 1188 1189 /* 1190 * Skip the check for temporary snapshots or if we have already checked 1191 * the counts in dsl_dataset_snapshot_check. This means we really only 1192 * check the count here when we're receiving a stream. 1193 */ 1194 if (cnt != 0 && cr != NULL) { 1195 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1196 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1197 if (error != 0) 1198 return (error); 1199 } 1200 1201 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1202 if (error != 0) 1203 return (error); 1204 1205 return (0); 1206} 1207 1208static int 1209dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1210{ 1211 dsl_dataset_snapshot_arg_t *ddsa = arg; 1212 dsl_pool_t *dp = dmu_tx_pool(tx); 1213 nvpair_t *pair; 1214 int rv = 0; 1215 1216 /* 1217 * Pre-compute how many total new snapshots will be created for each 1218 * level in the tree and below. This is needed for validating the 1219 * snapshot limit when either taking a recursive snapshot or when 1220 * taking multiple snapshots. 1221 * 1222 * The problem is that the counts are not actually adjusted when 1223 * we are checking, only when we finally sync. For a single snapshot, 1224 * this is easy, the count will increase by 1 at each node up the tree, 1225 * but its more complicated for the recursive/multiple snapshot case. 1226 * 1227 * The dsl_fs_ss_limit_check function does recursively check the count 1228 * at each level up the tree but since it is validating each snapshot 1229 * independently we need to be sure that we are validating the complete 1230 * count for the entire set of snapshots. We do this by rolling up the 1231 * counts for each component of the name into an nvlist and then 1232 * checking each of those cases with the aggregated count. 1233 * 1234 * This approach properly handles not only the recursive snapshot 1235 * case (where we get all of those on the ddsa_snaps list) but also 1236 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1237 * validate the limit on 'a' using a count of 2). 1238 * 1239 * We validate the snapshot names in the third loop and only report 1240 * name errors once. 1241 */ 1242 if (dmu_tx_is_syncing(tx)) { 1243 nvlist_t *cnt_track = NULL; 1244 cnt_track = fnvlist_alloc(); 1245 1246 /* Rollup aggregated counts into the cnt_track list */ 1247 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1248 pair != NULL; 1249 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1250 char *pdelim; 1251 uint64_t val; 1252 char nm[MAXPATHLEN]; 1253 1254 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1255 pdelim = strchr(nm, '@'); 1256 if (pdelim == NULL) 1257 continue; 1258 *pdelim = '\0'; 1259 1260 do { 1261 if (nvlist_lookup_uint64(cnt_track, nm, 1262 &val) == 0) { 1263 /* update existing entry */ 1264 fnvlist_add_uint64(cnt_track, nm, 1265 val + 1); 1266 } else { 1267 /* add to list */ 1268 fnvlist_add_uint64(cnt_track, nm, 1); 1269 } 1270 1271 pdelim = strrchr(nm, '/'); 1272 if (pdelim != NULL) 1273 *pdelim = '\0'; 1274 } while (pdelim != NULL); 1275 } 1276 1277 /* Check aggregated counts at each level */ 1278 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1279 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1280 int error = 0; 1281 char *name; 1282 uint64_t cnt = 0; 1283 dsl_dataset_t *ds; 1284 1285 name = nvpair_name(pair); 1286 cnt = fnvpair_value_uint64(pair); 1287 ASSERT(cnt > 0); 1288 1289 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1290 if (error == 0) { 1291 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1292 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1293 ddsa->ddsa_cr); 1294 dsl_dataset_rele(ds, FTAG); 1295 } 1296 1297 if (error != 0) { 1298 if (ddsa->ddsa_errors != NULL) 1299 fnvlist_add_int32(ddsa->ddsa_errors, 1300 name, error); 1301 rv = error; 1302 /* only report one error for this check */ 1303 break; 1304 } 1305 } 1306 nvlist_free(cnt_track); 1307 } 1308 1309 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1310 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1311 int error = 0; 1312 dsl_dataset_t *ds; 1313 char *name, *atp; 1314 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1315 1316 name = nvpair_name(pair); 1317 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1318 error = SET_ERROR(ENAMETOOLONG); 1319 if (error == 0) { 1320 atp = strchr(name, '@'); 1321 if (atp == NULL) 1322 error = SET_ERROR(EINVAL); 1323 if (error == 0) 1324 (void) strlcpy(dsname, name, atp - name + 1); 1325 } 1326 if (error == 0) 1327 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1328 if (error == 0) { 1329 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1330 error = dsl_dataset_snapshot_check_impl(ds, 1331 atp + 1, tx, B_FALSE, 0, NULL); 1332 dsl_dataset_rele(ds, FTAG); 1333 } 1334 1335 if (error != 0) { 1336 if (ddsa->ddsa_errors != NULL) { 1337 fnvlist_add_int32(ddsa->ddsa_errors, 1338 name, error); 1339 } 1340 rv = error; 1341 } 1342 } 1343 1344 return (rv); 1345} 1346 1347void 1348dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1349 dmu_tx_t *tx) 1350{ 1351 static zil_header_t zero_zil; 1352 1353 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1354 dmu_buf_t *dbuf; 1355 dsl_dataset_phys_t *dsphys; 1356 uint64_t dsobj, crtxg; 1357 objset_t *mos = dp->dp_meta_objset; 1358 objset_t *os; 1359 1360 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1361 1362 /* 1363 * If we are on an old pool, the zil must not be active, in which 1364 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1365 */ 1366 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1367 dmu_objset_from_ds(ds, &os) != 0 || 1368 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1369 sizeof (zero_zil)) == 0); 1370 1371 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1372 1373 /* 1374 * The origin's ds_creation_txg has to be < TXG_INITIAL 1375 */ 1376 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1377 crtxg = 1; 1378 else 1379 crtxg = tx->tx_txg; 1380 1381 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1382 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1383 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1384 dmu_buf_will_dirty(dbuf, tx); 1385 dsphys = dbuf->db_data; 1386 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1387 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1388 dsphys->ds_fsid_guid = unique_create(); 1389 do { 1390 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1391 sizeof (dsphys->ds_guid)); 1392 } while (dsphys->ds_guid == 0); 1393 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1394 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1395 dsphys->ds_next_snap_obj = ds->ds_object; 1396 dsphys->ds_num_children = 1; 1397 dsphys->ds_creation_time = gethrestime_sec(); 1398 dsphys->ds_creation_txg = crtxg; 1399 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1400 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1401 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1402 dsphys->ds_uncompressed_bytes = 1403 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1404 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1405 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1406 dmu_buf_rele(dbuf, FTAG); 1407 1408 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1409 if (ds->ds_feature_inuse[f]) 1410 dsl_dataset_activate_feature(dsobj, f, tx); 1411 } 1412 1413 ASSERT3U(ds->ds_prev != 0, ==, 1414 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1415 if (ds->ds_prev) { 1416 uint64_t next_clones_obj = 1417 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1418 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1419 ds->ds_object || 1420 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1421 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1422 ds->ds_object) { 1423 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1424 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1425 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1426 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1427 } else if (next_clones_obj != 0) { 1428 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1429 dsphys->ds_next_snap_obj, tx); 1430 VERIFY0(zap_add_int(mos, 1431 next_clones_obj, dsobj, tx)); 1432 } 1433 } 1434 1435 /* 1436 * If we have a reference-reservation on this dataset, we will 1437 * need to increase the amount of refreservation being charged 1438 * since our unique space is going to zero. 1439 */ 1440 if (ds->ds_reserved) { 1441 int64_t delta; 1442 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1443 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1444 ds->ds_reserved); 1445 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1446 delta, 0, 0, tx); 1447 } 1448 1449 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1450 dsl_dataset_phys(ds)->ds_deadlist_obj = 1451 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1452 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1453 dsl_deadlist_close(&ds->ds_deadlist); 1454 dsl_deadlist_open(&ds->ds_deadlist, mos, 1455 dsl_dataset_phys(ds)->ds_deadlist_obj); 1456 dsl_deadlist_add_key(&ds->ds_deadlist, 1457 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1458 1459 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1460 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1461 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1462 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1463 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1464 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1465 1466 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1467 snapname, 8, 1, &dsobj, tx)); 1468 1469 if (ds->ds_prev) 1470 dsl_dataset_rele(ds->ds_prev, ds); 1471 VERIFY0(dsl_dataset_hold_obj(dp, 1472 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1473 1474 dsl_scan_ds_snapshotted(ds, tx); 1475 1476 dsl_dir_snap_cmtime_update(ds->ds_dir); 1477 1478 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1479} 1480 1481static void 1482dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1483{ 1484 dsl_dataset_snapshot_arg_t *ddsa = arg; 1485 dsl_pool_t *dp = dmu_tx_pool(tx); 1486 nvpair_t *pair; 1487 1488 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1489 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1490 dsl_dataset_t *ds; 1491 char *name, *atp; 1492 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1493 1494 name = nvpair_name(pair); 1495 atp = strchr(name, '@'); 1496 (void) strlcpy(dsname, name, atp - name + 1); 1497 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1498 1499 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1500 if (ddsa->ddsa_props != NULL) { 1501 dsl_props_set_sync_impl(ds->ds_prev, 1502 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1503 } 1504 dsl_dataset_rele(ds, FTAG); 1505 } 1506} 1507 1508/* 1509 * The snapshots must all be in the same pool. 1510 * All-or-nothing: if there are any failures, nothing will be modified. 1511 */ 1512int 1513dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1514{ 1515 dsl_dataset_snapshot_arg_t ddsa; 1516 nvpair_t *pair; 1517 boolean_t needsuspend; 1518 int error; 1519 spa_t *spa; 1520 char *firstname; 1521 nvlist_t *suspended = NULL; 1522 1523 pair = nvlist_next_nvpair(snaps, NULL); 1524 if (pair == NULL) 1525 return (0); 1526 firstname = nvpair_name(pair); 1527 1528 error = spa_open(firstname, &spa, FTAG); 1529 if (error != 0) 1530 return (error); 1531 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1532 spa_close(spa, FTAG); 1533 1534 if (needsuspend) { 1535 suspended = fnvlist_alloc(); 1536 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1537 pair = nvlist_next_nvpair(snaps, pair)) { 1538 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1539 char *snapname = nvpair_name(pair); 1540 char *atp; 1541 void *cookie; 1542 1543 atp = strchr(snapname, '@'); 1544 if (atp == NULL) { 1545 error = SET_ERROR(EINVAL); 1546 break; 1547 } 1548 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1549 1550 error = zil_suspend(fsname, &cookie); 1551 if (error != 0) 1552 break; 1553 fnvlist_add_uint64(suspended, fsname, 1554 (uintptr_t)cookie); 1555 } 1556 } 1557 1558 ddsa.ddsa_snaps = snaps; 1559 ddsa.ddsa_props = props; 1560 ddsa.ddsa_errors = errors; 1561 ddsa.ddsa_cr = CRED(); 1562 1563 if (error == 0) { 1564 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1565 dsl_dataset_snapshot_sync, &ddsa, 1566 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1567 } 1568 1569 if (suspended != NULL) { 1570 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1571 pair = nvlist_next_nvpair(suspended, pair)) { 1572 zil_resume((void *)(uintptr_t) 1573 fnvpair_value_uint64(pair)); 1574 } 1575 fnvlist_free(suspended); 1576 } 1577 1578#ifdef __FreeBSD__ 1579#ifdef _KERNEL 1580 if (error == 0) { 1581 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1582 pair = nvlist_next_nvpair(snaps, pair)) { 1583 char *snapname = nvpair_name(pair); 1584 zvol_create_minors(snapname); 1585 } 1586 } 1587#endif 1588#endif 1589 return (error); 1590} 1591 1592typedef struct dsl_dataset_snapshot_tmp_arg { 1593 const char *ddsta_fsname; 1594 const char *ddsta_snapname; 1595 minor_t ddsta_cleanup_minor; 1596 const char *ddsta_htag; 1597} dsl_dataset_snapshot_tmp_arg_t; 1598 1599static int 1600dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1601{ 1602 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1603 dsl_pool_t *dp = dmu_tx_pool(tx); 1604 dsl_dataset_t *ds; 1605 int error; 1606 1607 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1608 if (error != 0) 1609 return (error); 1610 1611 /* NULL cred means no limit check for tmp snapshot */ 1612 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1613 tx, B_FALSE, 0, NULL); 1614 if (error != 0) { 1615 dsl_dataset_rele(ds, FTAG); 1616 return (error); 1617 } 1618 1619 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1620 dsl_dataset_rele(ds, FTAG); 1621 return (SET_ERROR(ENOTSUP)); 1622 } 1623 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1624 B_TRUE, tx); 1625 if (error != 0) { 1626 dsl_dataset_rele(ds, FTAG); 1627 return (error); 1628 } 1629 1630 dsl_dataset_rele(ds, FTAG); 1631 return (0); 1632} 1633 1634static void 1635dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1636{ 1637 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1638 dsl_pool_t *dp = dmu_tx_pool(tx); 1639 dsl_dataset_t *ds; 1640 1641 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1642 1643 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1644 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1645 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1646 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1647 1648 dsl_dataset_rele(ds, FTAG); 1649} 1650 1651int 1652dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1653 minor_t cleanup_minor, const char *htag) 1654{ 1655 dsl_dataset_snapshot_tmp_arg_t ddsta; 1656 int error; 1657 spa_t *spa; 1658 boolean_t needsuspend; 1659 void *cookie; 1660 1661 ddsta.ddsta_fsname = fsname; 1662 ddsta.ddsta_snapname = snapname; 1663 ddsta.ddsta_cleanup_minor = cleanup_minor; 1664 ddsta.ddsta_htag = htag; 1665 1666 error = spa_open(fsname, &spa, FTAG); 1667 if (error != 0) 1668 return (error); 1669 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1670 spa_close(spa, FTAG); 1671 1672 if (needsuspend) { 1673 error = zil_suspend(fsname, &cookie); 1674 if (error != 0) 1675 return (error); 1676 } 1677 1678 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1679 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1680 1681 if (needsuspend) 1682 zil_resume(cookie); 1683 return (error); 1684} 1685 1686 1687void 1688dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1689{ 1690 ASSERT(dmu_tx_is_syncing(tx)); 1691 ASSERT(ds->ds_objset != NULL); 1692 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1693 1694 /* 1695 * in case we had to change ds_fsid_guid when we opened it, 1696 * sync it out now. 1697 */ 1698 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1699 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1700 1701 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1702 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1703 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1704 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1705 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1706 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1707 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1708 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1709 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1710 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1711 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1712 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1713 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1714 } 1715 1716 dmu_objset_sync(ds->ds_objset, zio, tx); 1717 1718 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1719 if (ds->ds_feature_activation_needed[f]) { 1720 if (ds->ds_feature_inuse[f]) 1721 continue; 1722 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1723 ds->ds_feature_inuse[f] = B_TRUE; 1724 } 1725 } 1726} 1727 1728static void 1729get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1730{ 1731 uint64_t count = 0; 1732 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1733 zap_cursor_t zc; 1734 zap_attribute_t za; 1735 nvlist_t *propval = fnvlist_alloc(); 1736 nvlist_t *val = fnvlist_alloc(); 1737 1738 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1739 1740 /* 1741 * There may be missing entries in ds_next_clones_obj 1742 * due to a bug in a previous version of the code. 1743 * Only trust it if it has the right number of entries. 1744 */ 1745 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1746 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1747 &count)); 1748 } 1749 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1750 goto fail; 1751 for (zap_cursor_init(&zc, mos, 1752 dsl_dataset_phys(ds)->ds_next_clones_obj); 1753 zap_cursor_retrieve(&zc, &za) == 0; 1754 zap_cursor_advance(&zc)) { 1755 dsl_dataset_t *clone; 1756 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1757 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1758 za.za_first_integer, FTAG, &clone)); 1759 dsl_dir_name(clone->ds_dir, buf); 1760 fnvlist_add_boolean(val, buf); 1761 dsl_dataset_rele(clone, FTAG); 1762 } 1763 zap_cursor_fini(&zc); 1764 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1765 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1766fail: 1767 nvlist_free(val); 1768 nvlist_free(propval); 1769} 1770 1771static void 1772get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1773{ 1774 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1775 1776 if (dsl_dataset_has_resume_receive_state(ds)) { 1777 char *str; 1778 void *packed; 1779 uint8_t *compressed; 1780 uint64_t val; 1781 nvlist_t *token_nv = fnvlist_alloc(); 1782 size_t packed_size, compressed_size; 1783 1784 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1785 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1786 fnvlist_add_uint64(token_nv, "fromguid", val); 1787 } 1788 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1789 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1790 fnvlist_add_uint64(token_nv, "object", val); 1791 } 1792 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1793 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1794 fnvlist_add_uint64(token_nv, "offset", val); 1795 } 1796 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1797 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1798 fnvlist_add_uint64(token_nv, "bytes", val); 1799 } 1800 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1801 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1802 fnvlist_add_uint64(token_nv, "toguid", val); 1803 } 1804 char buf[256]; 1805 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1806 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1807 fnvlist_add_string(token_nv, "toname", buf); 1808 } 1809 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1810 DS_FIELD_RESUME_EMBEDOK) == 0) { 1811 fnvlist_add_boolean(token_nv, "embedok"); 1812 } 1813 packed = fnvlist_pack(token_nv, &packed_size); 1814 fnvlist_free(token_nv); 1815 compressed = kmem_alloc(packed_size, KM_SLEEP); 1816 1817 compressed_size = gzip_compress(packed, compressed, 1818 packed_size, packed_size, 6); 1819 1820 zio_cksum_t cksum; 1821 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1822 1823 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1824 for (int i = 0; i < compressed_size; i++) { 1825 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1826 } 1827 str[compressed_size * 2] = '\0'; 1828 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1829 ZFS_SEND_RESUME_TOKEN_VERSION, 1830 (longlong_t)cksum.zc_word[0], 1831 (longlong_t)packed_size, str); 1832 dsl_prop_nvlist_add_string(nv, 1833 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1834 kmem_free(packed, packed_size); 1835 kmem_free(str, compressed_size * 2 + 1); 1836 kmem_free(compressed, packed_size); 1837 strfree(propval); 1838 } 1839} 1840 1841void 1842dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1843{ 1844 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1845 uint64_t refd, avail, uobjs, aobjs, ratio; 1846 1847 ASSERT(dsl_pool_config_held(dp)); 1848 1849 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1850 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1851 dsl_dataset_phys(ds)->ds_compressed_bytes); 1852 1853 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1854 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1855 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1856 1857 if (ds->ds_is_snapshot) { 1858 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1859 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1860 dsl_dataset_phys(ds)->ds_unique_bytes); 1861 get_clones_stat(ds, nv); 1862 } else { 1863 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1864 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1865 dsl_dataset_name(ds->ds_prev, buf); 1866 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1867 } 1868 1869 dsl_dir_stats(ds->ds_dir, nv); 1870 } 1871 1872 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1874 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1875 1876 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1877 dsl_dataset_phys(ds)->ds_creation_time); 1878 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1879 dsl_dataset_phys(ds)->ds_creation_txg); 1880 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1881 ds->ds_quota); 1882 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1883 ds->ds_reserved); 1884 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1885 dsl_dataset_phys(ds)->ds_guid); 1886 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1887 dsl_dataset_phys(ds)->ds_unique_bytes); 1888 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1889 ds->ds_object); 1890 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1891 ds->ds_userrefs); 1892 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1893 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1894 1895 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1896 uint64_t written, comp, uncomp; 1897 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1898 dsl_dataset_t *prev; 1899 1900 int err = dsl_dataset_hold_obj(dp, 1901 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1902 if (err == 0) { 1903 err = dsl_dataset_space_written(prev, ds, &written, 1904 &comp, &uncomp); 1905 dsl_dataset_rele(prev, FTAG); 1906 if (err == 0) { 1907 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1908 written); 1909 } 1910 } 1911 } 1912 1913 if (!dsl_dataset_is_snapshot(ds)) { 1914 /* 1915 * A failed "newfs" (e.g. full) resumable receive leaves 1916 * the stats set on this dataset. Check here for the prop. 1917 */ 1918 get_receive_resume_stats(ds, nv); 1919 1920 /* 1921 * A failed incremental resumable receive leaves the 1922 * stats set on our child named "%recv". Check the child 1923 * for the prop. 1924 */ 1925 /* 6 extra bytes for /%recv */ 1926 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1927 dsl_dataset_t *recv_ds; 1928 dsl_dataset_name(ds, recvname); 1929 if (strlcat(recvname, "/", sizeof (recvname)) < 1930 sizeof (recvname) && 1931 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 1932 sizeof (recvname) && 1933 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1934 get_receive_resume_stats(recv_ds, nv); 1935 dsl_dataset_rele(recv_ds, FTAG); 1936 } 1937 } 1938} 1939 1940void 1941dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1942{ 1943 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1944 ASSERT(dsl_pool_config_held(dp)); 1945 1946 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1947 stat->dds_inconsistent = 1948 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1949 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1950 stat->dds_origin[0] = '\0'; 1951 if (ds->ds_is_snapshot) { 1952 stat->dds_is_snapshot = B_TRUE; 1953 stat->dds_num_clones = 1954 dsl_dataset_phys(ds)->ds_num_children - 1; 1955 } else { 1956 stat->dds_is_snapshot = B_FALSE; 1957 stat->dds_num_clones = 0; 1958 1959 if (dsl_dir_is_clone(ds->ds_dir)) { 1960 dsl_dataset_t *ods; 1961 1962 VERIFY0(dsl_dataset_hold_obj(dp, 1963 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1964 FTAG, &ods)); 1965 dsl_dataset_name(ods, stat->dds_origin); 1966 dsl_dataset_rele(ods, FTAG); 1967 } 1968 } 1969} 1970 1971uint64_t 1972dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1973{ 1974 return (ds->ds_fsid_guid); 1975} 1976 1977void 1978dsl_dataset_space(dsl_dataset_t *ds, 1979 uint64_t *refdbytesp, uint64_t *availbytesp, 1980 uint64_t *usedobjsp, uint64_t *availobjsp) 1981{ 1982 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1983 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1984 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1985 *availbytesp += 1986 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1987 if (ds->ds_quota != 0) { 1988 /* 1989 * Adjust available bytes according to refquota 1990 */ 1991 if (*refdbytesp < ds->ds_quota) 1992 *availbytesp = MIN(*availbytesp, 1993 ds->ds_quota - *refdbytesp); 1994 else 1995 *availbytesp = 0; 1996 } 1997 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1998 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1999} 2000 2001boolean_t 2002dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2003{ 2004 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2005 2006 ASSERT(dsl_pool_config_held(dp)); 2007 if (snap == NULL) 2008 return (B_FALSE); 2009 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 2010 dsl_dataset_phys(snap)->ds_creation_txg) { 2011 objset_t *os, *os_snap; 2012 /* 2013 * It may be that only the ZIL differs, because it was 2014 * reset in the head. Don't count that as being 2015 * modified. 2016 */ 2017 if (dmu_objset_from_ds(ds, &os) != 0) 2018 return (B_TRUE); 2019 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2020 return (B_TRUE); 2021 return (bcmp(&os->os_phys->os_meta_dnode, 2022 &os_snap->os_phys->os_meta_dnode, 2023 sizeof (os->os_phys->os_meta_dnode)) != 0); 2024 } 2025 return (B_FALSE); 2026} 2027 2028typedef struct dsl_dataset_rename_snapshot_arg { 2029 const char *ddrsa_fsname; 2030 const char *ddrsa_oldsnapname; 2031 const char *ddrsa_newsnapname; 2032 boolean_t ddrsa_recursive; 2033 dmu_tx_t *ddrsa_tx; 2034} dsl_dataset_rename_snapshot_arg_t; 2035 2036/* ARGSUSED */ 2037static int 2038dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2039 dsl_dataset_t *hds, void *arg) 2040{ 2041 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2042 int error; 2043 uint64_t val; 2044 2045 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2046 if (error != 0) { 2047 /* ignore nonexistent snapshots */ 2048 return (error == ENOENT ? 0 : error); 2049 } 2050 2051 /* new name should not exist */ 2052 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2053 if (error == 0) 2054 error = SET_ERROR(EEXIST); 2055 else if (error == ENOENT) 2056 error = 0; 2057 2058 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2059 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2060 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2061 error = SET_ERROR(ENAMETOOLONG); 2062 2063 return (error); 2064} 2065 2066static int 2067dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2068{ 2069 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2070 dsl_pool_t *dp = dmu_tx_pool(tx); 2071 dsl_dataset_t *hds; 2072 int error; 2073 2074 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2075 if (error != 0) 2076 return (error); 2077 2078 if (ddrsa->ddrsa_recursive) { 2079 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2080 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2081 DS_FIND_CHILDREN); 2082 } else { 2083 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2084 } 2085 dsl_dataset_rele(hds, FTAG); 2086 return (error); 2087} 2088 2089static int 2090dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2091 dsl_dataset_t *hds, void *arg) 2092{ 2093#ifdef __FreeBSD__ 2094#ifdef _KERNEL 2095 char *oldname, *newname; 2096#endif 2097#endif 2098 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2099 dsl_dataset_t *ds; 2100 uint64_t val; 2101 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2102 int error; 2103 2104 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2105 ASSERT(error == 0 || error == ENOENT); 2106 if (error == ENOENT) { 2107 /* ignore nonexistent snapshots */ 2108 return (0); 2109 } 2110 2111 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2112 2113 /* log before we change the name */ 2114 spa_history_log_internal_ds(ds, "rename", tx, 2115 "-> @%s", ddrsa->ddrsa_newsnapname); 2116 2117 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2118 B_FALSE)); 2119 mutex_enter(&ds->ds_lock); 2120 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2121 mutex_exit(&ds->ds_lock); 2122 VERIFY0(zap_add(dp->dp_meta_objset, 2123 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2124 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2125 2126#ifdef __FreeBSD__ 2127#ifdef _KERNEL 2128 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2129 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2130 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2131 ddrsa->ddrsa_oldsnapname); 2132 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2133 ddrsa->ddrsa_newsnapname); 2134 zfsvfs_update_fromname(oldname, newname); 2135 zvol_rename_minors(oldname, newname); 2136 kmem_free(newname, MAXPATHLEN); 2137 kmem_free(oldname, MAXPATHLEN); 2138#endif 2139#endif 2140 dsl_dataset_rele(ds, FTAG); 2141 2142 return (0); 2143} 2144 2145static void 2146dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2147{ 2148 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2149 dsl_pool_t *dp = dmu_tx_pool(tx); 2150 dsl_dataset_t *hds; 2151 2152 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2153 ddrsa->ddrsa_tx = tx; 2154 if (ddrsa->ddrsa_recursive) { 2155 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2156 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2157 DS_FIND_CHILDREN)); 2158 } else { 2159 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2160 } 2161 dsl_dataset_rele(hds, FTAG); 2162} 2163 2164int 2165dsl_dataset_rename_snapshot(const char *fsname, 2166 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2167{ 2168 dsl_dataset_rename_snapshot_arg_t ddrsa; 2169 2170 ddrsa.ddrsa_fsname = fsname; 2171 ddrsa.ddrsa_oldsnapname = oldsnapname; 2172 ddrsa.ddrsa_newsnapname = newsnapname; 2173 ddrsa.ddrsa_recursive = recursive; 2174 2175 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2176 dsl_dataset_rename_snapshot_sync, &ddrsa, 2177 1, ZFS_SPACE_CHECK_RESERVED)); 2178} 2179 2180/* 2181 * If we're doing an ownership handoff, we need to make sure that there is 2182 * only one long hold on the dataset. We're not allowed to change anything here 2183 * so we don't permanently release the long hold or regular hold here. We want 2184 * to do this only when syncing to avoid the dataset unexpectedly going away 2185 * when we release the long hold. 2186 */ 2187static int 2188dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2189{ 2190 boolean_t held; 2191 2192 if (!dmu_tx_is_syncing(tx)) 2193 return (0); 2194 2195 if (owner != NULL) { 2196 VERIFY3P(ds->ds_owner, ==, owner); 2197 dsl_dataset_long_rele(ds, owner); 2198 } 2199 2200 held = dsl_dataset_long_held(ds); 2201 2202 if (owner != NULL) 2203 dsl_dataset_long_hold(ds, owner); 2204 2205 if (held) 2206 return (SET_ERROR(EBUSY)); 2207 2208 return (0); 2209} 2210 2211typedef struct dsl_dataset_rollback_arg { 2212 const char *ddra_fsname; 2213 void *ddra_owner; 2214 nvlist_t *ddra_result; 2215} dsl_dataset_rollback_arg_t; 2216 2217static int 2218dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2219{ 2220 dsl_dataset_rollback_arg_t *ddra = arg; 2221 dsl_pool_t *dp = dmu_tx_pool(tx); 2222 dsl_dataset_t *ds; 2223 int64_t unused_refres_delta; 2224 int error; 2225 2226 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2227 if (error != 0) 2228 return (error); 2229 2230 /* must not be a snapshot */ 2231 if (ds->ds_is_snapshot) { 2232 dsl_dataset_rele(ds, FTAG); 2233 return (SET_ERROR(EINVAL)); 2234 } 2235 2236 /* must have a most recent snapshot */ 2237 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2238 dsl_dataset_rele(ds, FTAG); 2239 return (SET_ERROR(EINVAL)); 2240 } 2241 2242 /* must not have any bookmarks after the most recent snapshot */ 2243 nvlist_t *proprequest = fnvlist_alloc(); 2244 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2245 nvlist_t *bookmarks = fnvlist_alloc(); 2246 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2247 fnvlist_free(proprequest); 2248 if (error != 0) 2249 return (error); 2250 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2251 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2252 nvlist_t *valuenv = 2253 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2254 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2255 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2256 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2257 fnvlist_free(bookmarks); 2258 dsl_dataset_rele(ds, FTAG); 2259 return (SET_ERROR(EEXIST)); 2260 } 2261 } 2262 fnvlist_free(bookmarks); 2263 2264 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2265 if (error != 0) { 2266 dsl_dataset_rele(ds, FTAG); 2267 return (error); 2268 } 2269 2270 /* 2271 * Check if the snap we are rolling back to uses more than 2272 * the refquota. 2273 */ 2274 if (ds->ds_quota != 0 && 2275 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2276 dsl_dataset_rele(ds, FTAG); 2277 return (SET_ERROR(EDQUOT)); 2278 } 2279 2280 /* 2281 * When we do the clone swap, we will temporarily use more space 2282 * due to the refreservation (the head will no longer have any 2283 * unique space, so the entire amount of the refreservation will need 2284 * to be free). We will immediately destroy the clone, freeing 2285 * this space, but the freeing happens over many txg's. 2286 */ 2287 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2288 dsl_dataset_phys(ds)->ds_unique_bytes); 2289 2290 if (unused_refres_delta > 0 && 2291 unused_refres_delta > 2292 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2293 dsl_dataset_rele(ds, FTAG); 2294 return (SET_ERROR(ENOSPC)); 2295 } 2296 2297 dsl_dataset_rele(ds, FTAG); 2298 return (0); 2299} 2300 2301static void 2302dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2303{ 2304 dsl_dataset_rollback_arg_t *ddra = arg; 2305 dsl_pool_t *dp = dmu_tx_pool(tx); 2306 dsl_dataset_t *ds, *clone; 2307 uint64_t cloneobj; 2308 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2309 2310 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2311 2312 dsl_dataset_name(ds->ds_prev, namebuf); 2313 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2314 2315 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2316 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2317 2318 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2319 2320 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2321 dsl_dataset_zero_zil(ds, tx); 2322 2323 dsl_destroy_head_sync_impl(clone, tx); 2324 2325 dsl_dataset_rele(clone, FTAG); 2326 dsl_dataset_rele(ds, FTAG); 2327} 2328 2329/* 2330 * Rolls back the given filesystem or volume to the most recent snapshot. 2331 * The name of the most recent snapshot will be returned under key "target" 2332 * in the result nvlist. 2333 * 2334 * If owner != NULL: 2335 * - The existing dataset MUST be owned by the specified owner at entry 2336 * - Upon return, dataset will still be held by the same owner, whether we 2337 * succeed or not. 2338 * 2339 * This mode is required any time the existing filesystem is mounted. See 2340 * notes above zfs_suspend_fs() for further details. 2341 */ 2342int 2343dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2344{ 2345 dsl_dataset_rollback_arg_t ddra; 2346 2347 ddra.ddra_fsname = fsname; 2348 ddra.ddra_owner = owner; 2349 ddra.ddra_result = result; 2350 2351 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2352 dsl_dataset_rollback_sync, &ddra, 2353 1, ZFS_SPACE_CHECK_RESERVED)); 2354} 2355 2356struct promotenode { 2357 list_node_t link; 2358 dsl_dataset_t *ds; 2359}; 2360 2361typedef struct dsl_dataset_promote_arg { 2362 const char *ddpa_clonename; 2363 dsl_dataset_t *ddpa_clone; 2364 list_t shared_snaps, origin_snaps, clone_snaps; 2365 dsl_dataset_t *origin_origin; /* origin of the origin */ 2366 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2367 char *err_ds; 2368 cred_t *cr; 2369} dsl_dataset_promote_arg_t; 2370 2371static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2372static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2373 void *tag); 2374static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2375 2376static int 2377dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2378{ 2379 dsl_dataset_promote_arg_t *ddpa = arg; 2380 dsl_pool_t *dp = dmu_tx_pool(tx); 2381 dsl_dataset_t *hds; 2382 struct promotenode *snap; 2383 dsl_dataset_t *origin_ds; 2384 int err; 2385 uint64_t unused; 2386 uint64_t ss_mv_cnt; 2387 size_t max_snap_len; 2388 2389 err = promote_hold(ddpa, dp, FTAG); 2390 if (err != 0) 2391 return (err); 2392 2393 hds = ddpa->ddpa_clone; 2394 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2395 2396 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2397 promote_rele(ddpa, FTAG); 2398 return (SET_ERROR(EXDEV)); 2399 } 2400 2401 /* 2402 * Compute and check the amount of space to transfer. Since this is 2403 * so expensive, don't do the preliminary check. 2404 */ 2405 if (!dmu_tx_is_syncing(tx)) { 2406 promote_rele(ddpa, FTAG); 2407 return (0); 2408 } 2409 2410 snap = list_head(&ddpa->shared_snaps); 2411 origin_ds = snap->ds; 2412 2413 /* compute origin's new unique space */ 2414 snap = list_tail(&ddpa->clone_snaps); 2415 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2416 origin_ds->ds_object); 2417 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2418 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2419 &ddpa->unique, &unused, &unused); 2420 2421 /* 2422 * Walk the snapshots that we are moving 2423 * 2424 * Compute space to transfer. Consider the incremental changes 2425 * to used by each snapshot: 2426 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2427 * So each snapshot gave birth to: 2428 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2429 * So a sequence would look like: 2430 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2431 * Which simplifies to: 2432 * uN + kN + kN-1 + ... + k1 + k0 2433 * Note however, if we stop before we reach the ORIGIN we get: 2434 * uN + kN + kN-1 + ... + kM - uM-1 2435 */ 2436 ss_mv_cnt = 0; 2437 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2438 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2439 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2440 for (snap = list_head(&ddpa->shared_snaps); snap; 2441 snap = list_next(&ddpa->shared_snaps, snap)) { 2442 uint64_t val, dlused, dlcomp, dluncomp; 2443 dsl_dataset_t *ds = snap->ds; 2444 2445 ss_mv_cnt++; 2446 2447 /* 2448 * If there are long holds, we won't be able to evict 2449 * the objset. 2450 */ 2451 if (dsl_dataset_long_held(ds)) { 2452 err = SET_ERROR(EBUSY); 2453 goto out; 2454 } 2455 2456 /* Check that the snapshot name does not conflict */ 2457 VERIFY0(dsl_dataset_get_snapname(ds)); 2458 if (strlen(ds->ds_snapname) >= max_snap_len) { 2459 err = SET_ERROR(ENAMETOOLONG); 2460 goto out; 2461 } 2462 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2463 if (err == 0) { 2464 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2465 err = SET_ERROR(EEXIST); 2466 goto out; 2467 } 2468 if (err != ENOENT) 2469 goto out; 2470 2471 /* The very first snapshot does not have a deadlist */ 2472 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2473 continue; 2474 2475 dsl_deadlist_space(&ds->ds_deadlist, 2476 &dlused, &dlcomp, &dluncomp); 2477 ddpa->used += dlused; 2478 ddpa->comp += dlcomp; 2479 ddpa->uncomp += dluncomp; 2480 } 2481 2482 /* 2483 * If we are a clone of a clone then we never reached ORIGIN, 2484 * so we need to subtract out the clone origin's used space. 2485 */ 2486 if (ddpa->origin_origin) { 2487 ddpa->used -= 2488 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2489 ddpa->comp -= 2490 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2491 ddpa->uncomp -= 2492 dsl_dataset_phys(ddpa->origin_origin)-> 2493 ds_uncompressed_bytes; 2494 } 2495 2496 /* Check that there is enough space and limit headroom here */ 2497 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2498 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2499 if (err != 0) 2500 goto out; 2501 2502 /* 2503 * Compute the amounts of space that will be used by snapshots 2504 * after the promotion (for both origin and clone). For each, 2505 * it is the amount of space that will be on all of their 2506 * deadlists (that was not born before their new origin). 2507 */ 2508 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2509 uint64_t space; 2510 2511 /* 2512 * Note, typically this will not be a clone of a clone, 2513 * so dd_origin_txg will be < TXG_INITIAL, so 2514 * these snaplist_space() -> dsl_deadlist_space_range() 2515 * calls will be fast because they do not have to 2516 * iterate over all bps. 2517 */ 2518 snap = list_head(&ddpa->origin_snaps); 2519 err = snaplist_space(&ddpa->shared_snaps, 2520 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2521 if (err != 0) 2522 goto out; 2523 2524 err = snaplist_space(&ddpa->clone_snaps, 2525 snap->ds->ds_dir->dd_origin_txg, &space); 2526 if (err != 0) 2527 goto out; 2528 ddpa->cloneusedsnap += space; 2529 } 2530 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2531 DD_FLAG_USED_BREAKDOWN) { 2532 err = snaplist_space(&ddpa->origin_snaps, 2533 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2534 &ddpa->originusedsnap); 2535 if (err != 0) 2536 goto out; 2537 } 2538 2539out: 2540 promote_rele(ddpa, FTAG); 2541 return (err); 2542} 2543 2544static void 2545dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2546{ 2547 dsl_dataset_promote_arg_t *ddpa = arg; 2548 dsl_pool_t *dp = dmu_tx_pool(tx); 2549 dsl_dataset_t *hds; 2550 struct promotenode *snap; 2551 dsl_dataset_t *origin_ds; 2552 dsl_dataset_t *origin_head; 2553 dsl_dir_t *dd; 2554 dsl_dir_t *odd = NULL; 2555 uint64_t oldnext_obj; 2556 int64_t delta; 2557#if defined(__FreeBSD__) && defined(_KERNEL) 2558 char *oldname, *newname; 2559#endif 2560 2561 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2562 hds = ddpa->ddpa_clone; 2563 2564 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2565 2566 snap = list_head(&ddpa->shared_snaps); 2567 origin_ds = snap->ds; 2568 dd = hds->ds_dir; 2569 2570 snap = list_head(&ddpa->origin_snaps); 2571 origin_head = snap->ds; 2572 2573 /* 2574 * We need to explicitly open odd, since origin_ds's dd will be 2575 * changing. 2576 */ 2577 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2578 NULL, FTAG, &odd)); 2579 2580 /* change origin's next snap */ 2581 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2582 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2583 snap = list_tail(&ddpa->clone_snaps); 2584 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2585 origin_ds->ds_object); 2586 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2587 2588 /* change the origin's next clone */ 2589 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2590 dsl_dataset_remove_from_next_clones(origin_ds, 2591 snap->ds->ds_object, tx); 2592 VERIFY0(zap_add_int(dp->dp_meta_objset, 2593 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2594 oldnext_obj, tx)); 2595 } 2596 2597 /* change origin */ 2598 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2599 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2600 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2601 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2602 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2603 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2604 origin_head->ds_dir->dd_origin_txg = 2605 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2606 2607 /* change dd_clone entries */ 2608 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2609 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2610 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2611 VERIFY0(zap_add_int(dp->dp_meta_objset, 2612 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2613 hds->ds_object, tx)); 2614 2615 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2616 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2617 origin_head->ds_object, tx)); 2618 if (dsl_dir_phys(dd)->dd_clones == 0) { 2619 dsl_dir_phys(dd)->dd_clones = 2620 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2621 DMU_OT_NONE, 0, tx); 2622 } 2623 VERIFY0(zap_add_int(dp->dp_meta_objset, 2624 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2625 } 2626 2627#if defined(__FreeBSD__) && defined(_KERNEL) 2628 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2629 mutex_enter(&spa_namespace_lock); 2630 2631 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2632 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2633#endif 2634 2635 /* move snapshots to this dir */ 2636 for (snap = list_head(&ddpa->shared_snaps); snap; 2637 snap = list_next(&ddpa->shared_snaps, snap)) { 2638 dsl_dataset_t *ds = snap->ds; 2639 2640 /* 2641 * Property callbacks are registered to a particular 2642 * dsl_dir. Since ours is changing, evict the objset 2643 * so that they will be unregistered from the old dsl_dir. 2644 */ 2645 if (ds->ds_objset) { 2646 dmu_objset_evict(ds->ds_objset); 2647 ds->ds_objset = NULL; 2648 } 2649 2650 /* move snap name entry */ 2651 VERIFY0(dsl_dataset_get_snapname(ds)); 2652 VERIFY0(dsl_dataset_snap_remove(origin_head, 2653 ds->ds_snapname, tx, B_TRUE)); 2654 VERIFY0(zap_add(dp->dp_meta_objset, 2655 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2656 8, 1, &ds->ds_object, tx)); 2657 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2658 DD_FIELD_SNAPSHOT_COUNT, tx); 2659 2660 /* change containing dsl_dir */ 2661 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2662 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2663 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2664 ASSERT3P(ds->ds_dir, ==, odd); 2665 dsl_dir_rele(ds->ds_dir, ds); 2666 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2667 NULL, ds, &ds->ds_dir)); 2668 2669#if defined(__FreeBSD__) && defined(_KERNEL) 2670 dsl_dataset_name(ds, newname); 2671 zfsvfs_update_fromname(oldname, newname); 2672 zvol_rename_minors(oldname, newname); 2673#endif 2674 2675 /* move any clone references */ 2676 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2677 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2678 zap_cursor_t zc; 2679 zap_attribute_t za; 2680 2681 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2682 dsl_dataset_phys(ds)->ds_next_clones_obj); 2683 zap_cursor_retrieve(&zc, &za) == 0; 2684 zap_cursor_advance(&zc)) { 2685 dsl_dataset_t *cnds; 2686 uint64_t o; 2687 2688 if (za.za_first_integer == oldnext_obj) { 2689 /* 2690 * We've already moved the 2691 * origin's reference. 2692 */ 2693 continue; 2694 } 2695 2696 VERIFY0(dsl_dataset_hold_obj(dp, 2697 za.za_first_integer, FTAG, &cnds)); 2698 o = dsl_dir_phys(cnds->ds_dir)-> 2699 dd_head_dataset_obj; 2700 2701 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2702 dsl_dir_phys(odd)->dd_clones, o, tx)); 2703 VERIFY0(zap_add_int(dp->dp_meta_objset, 2704 dsl_dir_phys(dd)->dd_clones, o, tx)); 2705 dsl_dataset_rele(cnds, FTAG); 2706 } 2707 zap_cursor_fini(&zc); 2708 } 2709 2710 ASSERT(!dsl_prop_hascb(ds)); 2711 } 2712 2713#if defined(__FreeBSD__) && defined(_KERNEL) 2714 mutex_exit(&spa_namespace_lock); 2715 2716 kmem_free(newname, MAXPATHLEN); 2717 kmem_free(oldname, MAXPATHLEN); 2718#endif 2719 /* 2720 * Change space accounting. 2721 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2722 * both be valid, or both be 0 (resulting in delta == 0). This 2723 * is true for each of {clone,origin} independently. 2724 */ 2725 2726 delta = ddpa->cloneusedsnap - 2727 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2728 ASSERT3S(delta, >=, 0); 2729 ASSERT3U(ddpa->used, >=, delta); 2730 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2731 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2732 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2733 2734 delta = ddpa->originusedsnap - 2735 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2736 ASSERT3S(delta, <=, 0); 2737 ASSERT3U(ddpa->used, >=, -delta); 2738 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2739 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2740 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2741 2742 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2743 2744 /* log history record */ 2745 spa_history_log_internal_ds(hds, "promote", tx, ""); 2746 2747 dsl_dir_rele(odd, FTAG); 2748 promote_rele(ddpa, FTAG); 2749} 2750 2751/* 2752 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2753 * (exclusive) and last_obj (inclusive). The list will be in reverse 2754 * order (last_obj will be the list_head()). If first_obj == 0, do all 2755 * snapshots back to this dataset's origin. 2756 */ 2757static int 2758snaplist_make(dsl_pool_t *dp, 2759 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2760{ 2761 uint64_t obj = last_obj; 2762 2763 list_create(l, sizeof (struct promotenode), 2764 offsetof(struct promotenode, link)); 2765 2766 while (obj != first_obj) { 2767 dsl_dataset_t *ds; 2768 struct promotenode *snap; 2769 int err; 2770 2771 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2772 ASSERT(err != ENOENT); 2773 if (err != 0) 2774 return (err); 2775 2776 if (first_obj == 0) 2777 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2778 2779 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2780 snap->ds = ds; 2781 list_insert_tail(l, snap); 2782 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2783 } 2784 2785 return (0); 2786} 2787 2788static int 2789snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2790{ 2791 struct promotenode *snap; 2792 2793 *spacep = 0; 2794 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2795 uint64_t used, comp, uncomp; 2796 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2797 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2798 *spacep += used; 2799 } 2800 return (0); 2801} 2802 2803static void 2804snaplist_destroy(list_t *l, void *tag) 2805{ 2806 struct promotenode *snap; 2807 2808 if (l == NULL || !list_link_active(&l->list_head)) 2809 return; 2810 2811 while ((snap = list_tail(l)) != NULL) { 2812 list_remove(l, snap); 2813 dsl_dataset_rele(snap->ds, tag); 2814 kmem_free(snap, sizeof (*snap)); 2815 } 2816 list_destroy(l); 2817} 2818 2819static int 2820promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2821{ 2822 int error; 2823 dsl_dir_t *dd; 2824 struct promotenode *snap; 2825 2826 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2827 &ddpa->ddpa_clone); 2828 if (error != 0) 2829 return (error); 2830 dd = ddpa->ddpa_clone->ds_dir; 2831 2832 if (ddpa->ddpa_clone->ds_is_snapshot || 2833 !dsl_dir_is_clone(dd)) { 2834 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2835 return (SET_ERROR(EINVAL)); 2836 } 2837 2838 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2839 &ddpa->shared_snaps, tag); 2840 if (error != 0) 2841 goto out; 2842 2843 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2844 &ddpa->clone_snaps, tag); 2845 if (error != 0) 2846 goto out; 2847 2848 snap = list_head(&ddpa->shared_snaps); 2849 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2850 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2851 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2852 &ddpa->origin_snaps, tag); 2853 if (error != 0) 2854 goto out; 2855 2856 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2857 error = dsl_dataset_hold_obj(dp, 2858 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2859 tag, &ddpa->origin_origin); 2860 if (error != 0) 2861 goto out; 2862 } 2863out: 2864 if (error != 0) 2865 promote_rele(ddpa, tag); 2866 return (error); 2867} 2868 2869static void 2870promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2871{ 2872 snaplist_destroy(&ddpa->shared_snaps, tag); 2873 snaplist_destroy(&ddpa->clone_snaps, tag); 2874 snaplist_destroy(&ddpa->origin_snaps, tag); 2875 if (ddpa->origin_origin != NULL) 2876 dsl_dataset_rele(ddpa->origin_origin, tag); 2877 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2878} 2879 2880/* 2881 * Promote a clone. 2882 * 2883 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2884 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 2885 */ 2886int 2887dsl_dataset_promote(const char *name, char *conflsnap) 2888{ 2889 dsl_dataset_promote_arg_t ddpa = { 0 }; 2890 uint64_t numsnaps; 2891 int error; 2892 objset_t *os; 2893 2894 /* 2895 * We will modify space proportional to the number of 2896 * snapshots. Compute numsnaps. 2897 */ 2898 error = dmu_objset_hold(name, FTAG, &os); 2899 if (error != 0) 2900 return (error); 2901 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2902 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2903 &numsnaps); 2904 dmu_objset_rele(os, FTAG); 2905 if (error != 0) 2906 return (error); 2907 2908 ddpa.ddpa_clonename = name; 2909 ddpa.err_ds = conflsnap; 2910 ddpa.cr = CRED(); 2911 2912 return (dsl_sync_task(name, dsl_dataset_promote_check, 2913 dsl_dataset_promote_sync, &ddpa, 2914 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2915} 2916 2917int 2918dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2919 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2920{ 2921 /* 2922 * "slack" factor for received datasets with refquota set on them. 2923 * See the bottom of this function for details on its use. 2924 */ 2925 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 2926 int64_t unused_refres_delta; 2927 2928 /* they should both be heads */ 2929 if (clone->ds_is_snapshot || 2930 origin_head->ds_is_snapshot) 2931 return (SET_ERROR(EINVAL)); 2932 2933 /* if we are not forcing, the branch point should be just before them */ 2934 if (!force && clone->ds_prev != origin_head->ds_prev) 2935 return (SET_ERROR(EINVAL)); 2936 2937 /* clone should be the clone (unless they are unrelated) */ 2938 if (clone->ds_prev != NULL && 2939 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2940 origin_head->ds_dir != clone->ds_prev->ds_dir) 2941 return (SET_ERROR(EINVAL)); 2942 2943 /* the clone should be a child of the origin */ 2944 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2945 return (SET_ERROR(EINVAL)); 2946 2947 /* origin_head shouldn't be modified unless 'force' */ 2948 if (!force && 2949 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2950 return (SET_ERROR(ETXTBSY)); 2951 2952 /* origin_head should have no long holds (e.g. is not mounted) */ 2953 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2954 return (SET_ERROR(EBUSY)); 2955 2956 /* check amount of any unconsumed refreservation */ 2957 unused_refres_delta = 2958 (int64_t)MIN(origin_head->ds_reserved, 2959 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2960 (int64_t)MIN(origin_head->ds_reserved, 2961 dsl_dataset_phys(clone)->ds_unique_bytes); 2962 2963 if (unused_refres_delta > 0 && 2964 unused_refres_delta > 2965 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2966 return (SET_ERROR(ENOSPC)); 2967 2968 /* 2969 * The clone can't be too much over the head's refquota. 2970 * 2971 * To ensure that the entire refquota can be used, we allow one 2972 * transaction to exceed the the refquota. Therefore, this check 2973 * needs to also allow for the space referenced to be more than the 2974 * refquota. The maximum amount of space that one transaction can use 2975 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 2976 * overage ensures that we are able to receive a filesystem that 2977 * exceeds the refquota on the source system. 2978 * 2979 * So that overage is the refquota_slack we use below. 2980 */ 2981 if (origin_head->ds_quota != 0 && 2982 dsl_dataset_phys(clone)->ds_referenced_bytes > 2983 origin_head->ds_quota + refquota_slack) 2984 return (SET_ERROR(EDQUOT)); 2985 2986 return (0); 2987} 2988 2989void 2990dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2991 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2992{ 2993 dsl_pool_t *dp = dmu_tx_pool(tx); 2994 int64_t unused_refres_delta; 2995 2996 ASSERT(clone->ds_reserved == 0); 2997 /* 2998 * NOTE: On DEBUG kernels there could be a race between this and 2999 * the check function if spa_asize_inflation is adjusted... 3000 */ 3001 ASSERT(origin_head->ds_quota == 0 || 3002 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 3003 DMU_MAX_ACCESS * spa_asize_inflation); 3004 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 3005 3006 /* 3007 * Swap per-dataset feature flags. 3008 */ 3009 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 3010 if (!(spa_feature_table[f].fi_flags & 3011 ZFEATURE_FLAG_PER_DATASET)) { 3012 ASSERT(!clone->ds_feature_inuse[f]); 3013 ASSERT(!origin_head->ds_feature_inuse[f]); 3014 continue; 3015 } 3016 3017 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3018 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3019 3020 if (clone_inuse) { 3021 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3022 clone->ds_feature_inuse[f] = B_FALSE; 3023 } 3024 if (origin_head_inuse) { 3025 dsl_dataset_deactivate_feature(origin_head->ds_object, 3026 f, tx); 3027 origin_head->ds_feature_inuse[f] = B_FALSE; 3028 } 3029 if (clone_inuse) { 3030 dsl_dataset_activate_feature(origin_head->ds_object, 3031 f, tx); 3032 origin_head->ds_feature_inuse[f] = B_TRUE; 3033 } 3034 if (origin_head_inuse) { 3035 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3036 clone->ds_feature_inuse[f] = B_TRUE; 3037 } 3038 } 3039 3040 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3041 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3042 3043 if (clone->ds_objset != NULL) { 3044 dmu_objset_evict(clone->ds_objset); 3045 clone->ds_objset = NULL; 3046 } 3047 3048 if (origin_head->ds_objset != NULL) { 3049 dmu_objset_evict(origin_head->ds_objset); 3050 origin_head->ds_objset = NULL; 3051 } 3052 3053 unused_refres_delta = 3054 (int64_t)MIN(origin_head->ds_reserved, 3055 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3056 (int64_t)MIN(origin_head->ds_reserved, 3057 dsl_dataset_phys(clone)->ds_unique_bytes); 3058 3059 /* 3060 * Reset origin's unique bytes, if it exists. 3061 */ 3062 if (clone->ds_prev) { 3063 dsl_dataset_t *origin = clone->ds_prev; 3064 uint64_t comp, uncomp; 3065 3066 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3067 dsl_deadlist_space_range(&clone->ds_deadlist, 3068 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3069 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3070 } 3071 3072 /* swap blkptrs */ 3073 { 3074 blkptr_t tmp; 3075 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3076 dsl_dataset_phys(origin_head)->ds_bp = 3077 dsl_dataset_phys(clone)->ds_bp; 3078 dsl_dataset_phys(clone)->ds_bp = tmp; 3079 } 3080 3081 /* set dd_*_bytes */ 3082 { 3083 int64_t dused, dcomp, duncomp; 3084 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3085 uint64_t odl_used, odl_comp, odl_uncomp; 3086 3087 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3088 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3089 3090 dsl_deadlist_space(&clone->ds_deadlist, 3091 &cdl_used, &cdl_comp, &cdl_uncomp); 3092 dsl_deadlist_space(&origin_head->ds_deadlist, 3093 &odl_used, &odl_comp, &odl_uncomp); 3094 3095 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3096 cdl_used - 3097 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3098 odl_used); 3099 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3100 cdl_comp - 3101 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3102 odl_comp); 3103 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3104 cdl_uncomp - 3105 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3106 odl_uncomp); 3107 3108 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3109 dused, dcomp, duncomp, tx); 3110 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3111 -dused, -dcomp, -duncomp, tx); 3112 3113 /* 3114 * The difference in the space used by snapshots is the 3115 * difference in snapshot space due to the head's 3116 * deadlist (since that's the only thing that's 3117 * changing that affects the snapused). 3118 */ 3119 dsl_deadlist_space_range(&clone->ds_deadlist, 3120 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3121 &cdl_used, &cdl_comp, &cdl_uncomp); 3122 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3123 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3124 &odl_used, &odl_comp, &odl_uncomp); 3125 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3126 DD_USED_HEAD, DD_USED_SNAP, NULL); 3127 } 3128 3129 /* swap ds_*_bytes */ 3130 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3131 dsl_dataset_phys(clone)->ds_referenced_bytes); 3132 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3133 dsl_dataset_phys(clone)->ds_compressed_bytes); 3134 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3135 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3136 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3137 dsl_dataset_phys(clone)->ds_unique_bytes); 3138 3139 /* apply any parent delta for change in unconsumed refreservation */ 3140 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3141 unused_refres_delta, 0, 0, tx); 3142 3143 /* 3144 * Swap deadlists. 3145 */ 3146 dsl_deadlist_close(&clone->ds_deadlist); 3147 dsl_deadlist_close(&origin_head->ds_deadlist); 3148 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3149 dsl_dataset_phys(clone)->ds_deadlist_obj); 3150 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3151 dsl_dataset_phys(clone)->ds_deadlist_obj); 3152 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3153 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3154 3155 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3156 3157 spa_history_log_internal_ds(clone, "clone swap", tx, 3158 "parent=%s", origin_head->ds_dir->dd_myname); 3159} 3160 3161/* 3162 * Given a pool name and a dataset object number in that pool, 3163 * return the name of that dataset. 3164 */ 3165int 3166dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3167{ 3168 dsl_pool_t *dp; 3169 dsl_dataset_t *ds; 3170 int error; 3171 3172 error = dsl_pool_hold(pname, FTAG, &dp); 3173 if (error != 0) 3174 return (error); 3175 3176 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3177 if (error == 0) { 3178 dsl_dataset_name(ds, buf); 3179 dsl_dataset_rele(ds, FTAG); 3180 } 3181 dsl_pool_rele(dp, FTAG); 3182 3183 return (error); 3184} 3185 3186int 3187dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3188 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3189{ 3190 int error = 0; 3191 3192 ASSERT3S(asize, >, 0); 3193 3194 /* 3195 * *ref_rsrv is the portion of asize that will come from any 3196 * unconsumed refreservation space. 3197 */ 3198 *ref_rsrv = 0; 3199 3200 mutex_enter(&ds->ds_lock); 3201 /* 3202 * Make a space adjustment for reserved bytes. 3203 */ 3204 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3205 ASSERT3U(*used, >=, 3206 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3207 *used -= 3208 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3209 *ref_rsrv = 3210 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3211 } 3212 3213 if (!check_quota || ds->ds_quota == 0) { 3214 mutex_exit(&ds->ds_lock); 3215 return (0); 3216 } 3217 /* 3218 * If they are requesting more space, and our current estimate 3219 * is over quota, they get to try again unless the actual 3220 * on-disk is over quota and there are no pending changes (which 3221 * may free up space for us). 3222 */ 3223 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3224 ds->ds_quota) { 3225 if (inflight > 0 || 3226 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3227 error = SET_ERROR(ERESTART); 3228 else 3229 error = SET_ERROR(EDQUOT); 3230 } 3231 mutex_exit(&ds->ds_lock); 3232 3233 return (error); 3234} 3235 3236typedef struct dsl_dataset_set_qr_arg { 3237 const char *ddsqra_name; 3238 zprop_source_t ddsqra_source; 3239 uint64_t ddsqra_value; 3240} dsl_dataset_set_qr_arg_t; 3241 3242 3243/* ARGSUSED */ 3244static int 3245dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3246{ 3247 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3248 dsl_pool_t *dp = dmu_tx_pool(tx); 3249 dsl_dataset_t *ds; 3250 int error; 3251 uint64_t newval; 3252 3253 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3254 return (SET_ERROR(ENOTSUP)); 3255 3256 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3257 if (error != 0) 3258 return (error); 3259 3260 if (ds->ds_is_snapshot) { 3261 dsl_dataset_rele(ds, FTAG); 3262 return (SET_ERROR(EINVAL)); 3263 } 3264 3265 error = dsl_prop_predict(ds->ds_dir, 3266 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3267 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3268 if (error != 0) { 3269 dsl_dataset_rele(ds, FTAG); 3270 return (error); 3271 } 3272 3273 if (newval == 0) { 3274 dsl_dataset_rele(ds, FTAG); 3275 return (0); 3276 } 3277 3278 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3279 newval < ds->ds_reserved) { 3280 dsl_dataset_rele(ds, FTAG); 3281 return (SET_ERROR(ENOSPC)); 3282 } 3283 3284 dsl_dataset_rele(ds, FTAG); 3285 return (0); 3286} 3287 3288static void 3289dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3290{ 3291 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3292 dsl_pool_t *dp = dmu_tx_pool(tx); 3293 dsl_dataset_t *ds; 3294 uint64_t newval; 3295 3296 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3297 3298 dsl_prop_set_sync_impl(ds, 3299 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3300 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3301 &ddsqra->ddsqra_value, tx); 3302 3303 VERIFY0(dsl_prop_get_int_ds(ds, 3304 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3305 3306 if (ds->ds_quota != newval) { 3307 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3308 ds->ds_quota = newval; 3309 } 3310 dsl_dataset_rele(ds, FTAG); 3311} 3312 3313int 3314dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3315 uint64_t refquota) 3316{ 3317 dsl_dataset_set_qr_arg_t ddsqra; 3318 3319 ddsqra.ddsqra_name = dsname; 3320 ddsqra.ddsqra_source = source; 3321 ddsqra.ddsqra_value = refquota; 3322 3323 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3324 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3325} 3326 3327static int 3328dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3329{ 3330 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3331 dsl_pool_t *dp = dmu_tx_pool(tx); 3332 dsl_dataset_t *ds; 3333 int error; 3334 uint64_t newval, unique; 3335 3336 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3337 return (SET_ERROR(ENOTSUP)); 3338 3339 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3340 if (error != 0) 3341 return (error); 3342 3343 if (ds->ds_is_snapshot) { 3344 dsl_dataset_rele(ds, FTAG); 3345 return (SET_ERROR(EINVAL)); 3346 } 3347 3348 error = dsl_prop_predict(ds->ds_dir, 3349 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3350 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3351 if (error != 0) { 3352 dsl_dataset_rele(ds, FTAG); 3353 return (error); 3354 } 3355 3356 /* 3357 * If we are doing the preliminary check in open context, the 3358 * space estimates may be inaccurate. 3359 */ 3360 if (!dmu_tx_is_syncing(tx)) { 3361 dsl_dataset_rele(ds, FTAG); 3362 return (0); 3363 } 3364 3365 mutex_enter(&ds->ds_lock); 3366 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3367 dsl_dataset_recalc_head_uniq(ds); 3368 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3369 mutex_exit(&ds->ds_lock); 3370 3371 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3372 uint64_t delta = MAX(unique, newval) - 3373 MAX(unique, ds->ds_reserved); 3374 3375 if (delta > 3376 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3377 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3378 dsl_dataset_rele(ds, FTAG); 3379 return (SET_ERROR(ENOSPC)); 3380 } 3381 } 3382 3383 dsl_dataset_rele(ds, FTAG); 3384 return (0); 3385} 3386 3387void 3388dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3389 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3390{ 3391 uint64_t newval; 3392 uint64_t unique; 3393 int64_t delta; 3394 3395 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3396 source, sizeof (value), 1, &value, tx); 3397 3398 VERIFY0(dsl_prop_get_int_ds(ds, 3399 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3400 3401 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3402 mutex_enter(&ds->ds_dir->dd_lock); 3403 mutex_enter(&ds->ds_lock); 3404 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3405 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3406 delta = MAX(0, (int64_t)(newval - unique)) - 3407 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3408 ds->ds_reserved = newval; 3409 mutex_exit(&ds->ds_lock); 3410 3411 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3412 mutex_exit(&ds->ds_dir->dd_lock); 3413} 3414 3415static void 3416dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3417{ 3418 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3419 dsl_pool_t *dp = dmu_tx_pool(tx); 3420 dsl_dataset_t *ds; 3421 3422 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3423 dsl_dataset_set_refreservation_sync_impl(ds, 3424 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3425 dsl_dataset_rele(ds, FTAG); 3426} 3427 3428int 3429dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3430 uint64_t refreservation) 3431{ 3432 dsl_dataset_set_qr_arg_t ddsqra; 3433 3434 ddsqra.ddsqra_name = dsname; 3435 ddsqra.ddsqra_source = source; 3436 ddsqra.ddsqra_value = refreservation; 3437 3438 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3439 dsl_dataset_set_refreservation_sync, &ddsqra, 3440 0, ZFS_SPACE_CHECK_NONE)); 3441} 3442 3443/* 3444 * Return (in *usedp) the amount of space written in new that is not 3445 * present in oldsnap. New may be a snapshot or the head. Old must be 3446 * a snapshot before new, in new's filesystem (or its origin). If not then 3447 * fail and return EINVAL. 3448 * 3449 * The written space is calculated by considering two components: First, we 3450 * ignore any freed space, and calculate the written as new's used space 3451 * minus old's used space. Next, we add in the amount of space that was freed 3452 * between the two snapshots, thus reducing new's used space relative to old's. 3453 * Specifically, this is the space that was born before old->ds_creation_txg, 3454 * and freed before new (ie. on new's deadlist or a previous deadlist). 3455 * 3456 * space freed [---------------------] 3457 * snapshots ---O-------O--------O-------O------ 3458 * oldsnap new 3459 */ 3460int 3461dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3462 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3463{ 3464 int err = 0; 3465 uint64_t snapobj; 3466 dsl_pool_t *dp = new->ds_dir->dd_pool; 3467 3468 ASSERT(dsl_pool_config_held(dp)); 3469 3470 *usedp = 0; 3471 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3472 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3473 3474 *compp = 0; 3475 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3476 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3477 3478 *uncompp = 0; 3479 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3480 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3481 3482 snapobj = new->ds_object; 3483 while (snapobj != oldsnap->ds_object) { 3484 dsl_dataset_t *snap; 3485 uint64_t used, comp, uncomp; 3486 3487 if (snapobj == new->ds_object) { 3488 snap = new; 3489 } else { 3490 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3491 if (err != 0) 3492 break; 3493 } 3494 3495 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3496 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3497 /* 3498 * The blocks in the deadlist can not be born after 3499 * ds_prev_snap_txg, so get the whole deadlist space, 3500 * which is more efficient (especially for old-format 3501 * deadlists). Unfortunately the deadlist code 3502 * doesn't have enough information to make this 3503 * optimization itself. 3504 */ 3505 dsl_deadlist_space(&snap->ds_deadlist, 3506 &used, &comp, &uncomp); 3507 } else { 3508 dsl_deadlist_space_range(&snap->ds_deadlist, 3509 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3510 &used, &comp, &uncomp); 3511 } 3512 *usedp += used; 3513 *compp += comp; 3514 *uncompp += uncomp; 3515 3516 /* 3517 * If we get to the beginning of the chain of snapshots 3518 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3519 * was not a snapshot of/before new. 3520 */ 3521 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3522 if (snap != new) 3523 dsl_dataset_rele(snap, FTAG); 3524 if (snapobj == 0) { 3525 err = SET_ERROR(EINVAL); 3526 break; 3527 } 3528 3529 } 3530 return (err); 3531} 3532 3533/* 3534 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3535 * lastsnap, and all snapshots in between are deleted. 3536 * 3537 * blocks that would be freed [---------------------------] 3538 * snapshots ---O-------O--------O-------O--------O 3539 * firstsnap lastsnap 3540 * 3541 * This is the set of blocks that were born after the snap before firstsnap, 3542 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3543 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3544 * We calculate this by iterating over the relevant deadlists (from the snap 3545 * after lastsnap, backward to the snap after firstsnap), summing up the 3546 * space on the deadlist that was born after the snap before firstsnap. 3547 */ 3548int 3549dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3550 dsl_dataset_t *lastsnap, 3551 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3552{ 3553 int err = 0; 3554 uint64_t snapobj; 3555 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3556 3557 ASSERT(firstsnap->ds_is_snapshot); 3558 ASSERT(lastsnap->ds_is_snapshot); 3559 3560 /* 3561 * Check that the snapshots are in the same dsl_dir, and firstsnap 3562 * is before lastsnap. 3563 */ 3564 if (firstsnap->ds_dir != lastsnap->ds_dir || 3565 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3566 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3567 return (SET_ERROR(EINVAL)); 3568 3569 *usedp = *compp = *uncompp = 0; 3570 3571 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3572 while (snapobj != firstsnap->ds_object) { 3573 dsl_dataset_t *ds; 3574 uint64_t used, comp, uncomp; 3575 3576 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3577 if (err != 0) 3578 break; 3579 3580 dsl_deadlist_space_range(&ds->ds_deadlist, 3581 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3582 &used, &comp, &uncomp); 3583 *usedp += used; 3584 *compp += comp; 3585 *uncompp += uncomp; 3586 3587 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3588 ASSERT3U(snapobj, !=, 0); 3589 dsl_dataset_rele(ds, FTAG); 3590 } 3591 return (err); 3592} 3593 3594/* 3595 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3596 * For example, they could both be snapshots of the same filesystem, and 3597 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3598 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3599 * filesystem. Or 'earlier' could be the origin's origin. 3600 * 3601 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3602 */ 3603boolean_t 3604dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3605 uint64_t earlier_txg) 3606{ 3607 dsl_pool_t *dp = later->ds_dir->dd_pool; 3608 int error; 3609 boolean_t ret; 3610 3611 ASSERT(dsl_pool_config_held(dp)); 3612 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3613 3614 if (earlier_txg == 0) 3615 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3616 3617 if (later->ds_is_snapshot && 3618 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3619 return (B_FALSE); 3620 3621 if (later->ds_dir == earlier->ds_dir) 3622 return (B_TRUE); 3623 if (!dsl_dir_is_clone(later->ds_dir)) 3624 return (B_FALSE); 3625 3626 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3627 return (B_TRUE); 3628 dsl_dataset_t *origin; 3629 error = dsl_dataset_hold_obj(dp, 3630 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3631 if (error != 0) 3632 return (B_FALSE); 3633 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3634 dsl_dataset_rele(origin, FTAG); 3635 return (ret); 3636} 3637 3638void 3639dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3640{ 3641 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3642 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3643} 3644 3645boolean_t 3646dsl_dataset_is_zapified(dsl_dataset_t *ds) 3647{ 3648 dmu_object_info_t doi; 3649 3650 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3651 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3652} 3653 3654boolean_t 3655dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3656{ 3657 return (dsl_dataset_is_zapified(ds) && 3658 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3659 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3660} 3661