dsl_dataset.c revision 277585
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, 2014 by Delphix. All rights reserved. 25 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2014 RackTop Systems. 27 */ 28 29#include <sys/dmu_objset.h> 30#include <sys/dsl_dataset.h> 31#include <sys/dsl_dir.h> 32#include <sys/dsl_prop.h> 33#include <sys/dsl_synctask.h> 34#include <sys/dmu_traverse.h> 35#include <sys/dmu_impl.h> 36#include <sys/dmu_tx.h> 37#include <sys/arc.h> 38#include <sys/zio.h> 39#include <sys/zap.h> 40#include <sys/zfeature.h> 41#include <sys/unique.h> 42#include <sys/zfs_context.h> 43#include <sys/zfs_ioctl.h> 44#include <sys/spa.h> 45#include <sys/zfs_znode.h> 46#include <sys/zfs_onexit.h> 47#include <sys/zvol.h> 48#include <sys/dsl_scan.h> 49#include <sys/dsl_deadlist.h> 50#include <sys/dsl_destroy.h> 51#include <sys/dsl_userhold.h> 52#include <sys/dsl_bookmark.h> 53 54SYSCTL_DECL(_vfs_zfs); 55 56/* 57 * The SPA supports block sizes up to 16MB. However, very large blocks 58 * can have an impact on i/o latency (e.g. tying up a spinning disk for 59 * ~300ms), and also potentially on the memory allocator. Therefore, 60 * we do not allow the recordsize to be set larger than zfs_max_recordsize 61 * (default 1MB). Larger blocks can be created by changing this tunable, 62 * and pools with larger blocks can always be imported and used, regardless 63 * of this setting. 64 */ 65int zfs_max_recordsize = 1 * 1024 * 1024; 66SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 67 &zfs_max_recordsize, 0, 68 "Maximum block size. Expect dragons when tuning this."); 69 70#define SWITCH64(x, y) \ 71 { \ 72 uint64_t __tmp = (x); \ 73 (x) = (y); \ 74 (y) = __tmp; \ 75 } 76 77#define DS_REF_MAX (1ULL << 62) 78 79extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 80extern inline boolean_t dsl_dataset_is_snapshot(dsl_dataset_t *ds); 81 82/* 83 * Figure out how much of this delta should be propogated to the dsl_dir 84 * layer. If there's a refreservation, that space has already been 85 * partially accounted for in our ancestors. 86 */ 87static int64_t 88parent_delta(dsl_dataset_t *ds, int64_t delta) 89{ 90 dsl_dataset_phys_t *ds_phys; 91 uint64_t old_bytes, new_bytes; 92 93 if (ds->ds_reserved == 0) 94 return (delta); 95 96 ds_phys = dsl_dataset_phys(ds); 97 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 98 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 99 100 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 101 return (new_bytes - old_bytes); 102} 103 104void 105dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 106{ 107 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 108 int compressed = BP_GET_PSIZE(bp); 109 int uncompressed = BP_GET_UCSIZE(bp); 110 int64_t delta; 111 112 dprintf_bp(bp, "ds=%p", ds); 113 114 ASSERT(dmu_tx_is_syncing(tx)); 115 /* It could have been compressed away to nothing */ 116 if (BP_IS_HOLE(bp)) 117 return; 118 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 119 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 120 if (ds == NULL) { 121 dsl_pool_mos_diduse_space(tx->tx_pool, 122 used, compressed, uncompressed); 123 return; 124 } 125 126 dmu_buf_will_dirty(ds->ds_dbuf, tx); 127 mutex_enter(&ds->ds_lock); 128 delta = parent_delta(ds, used); 129 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 130 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 131 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 132 dsl_dataset_phys(ds)->ds_unique_bytes += used; 133 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) 134 ds->ds_need_large_blocks = B_TRUE; 135 mutex_exit(&ds->ds_lock); 136 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 137 compressed, uncompressed, tx); 138 dsl_dir_transfer_space(ds->ds_dir, used - delta, 139 DD_USED_REFRSRV, DD_USED_HEAD, tx); 140} 141 142int 143dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 144 boolean_t async) 145{ 146 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 147 int compressed = BP_GET_PSIZE(bp); 148 int uncompressed = BP_GET_UCSIZE(bp); 149 150 if (BP_IS_HOLE(bp)) 151 return (0); 152 153 ASSERT(dmu_tx_is_syncing(tx)); 154 ASSERT(bp->blk_birth <= tx->tx_txg); 155 156 if (ds == NULL) { 157 dsl_free(tx->tx_pool, tx->tx_txg, bp); 158 dsl_pool_mos_diduse_space(tx->tx_pool, 159 -used, -compressed, -uncompressed); 160 return (used); 161 } 162 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 163 164 ASSERT(!dsl_dataset_is_snapshot(ds)); 165 dmu_buf_will_dirty(ds->ds_dbuf, tx); 166 167 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 168 int64_t delta; 169 170 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 171 dsl_free(tx->tx_pool, tx->tx_txg, bp); 172 173 mutex_enter(&ds->ds_lock); 174 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 175 !DS_UNIQUE_IS_ACCURATE(ds)); 176 delta = parent_delta(ds, -used); 177 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 178 mutex_exit(&ds->ds_lock); 179 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 180 delta, -compressed, -uncompressed, tx); 181 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 182 DD_USED_REFRSRV, DD_USED_HEAD, tx); 183 } else { 184 dprintf_bp(bp, "putting on dead list: %s", ""); 185 if (async) { 186 /* 187 * We are here as part of zio's write done callback, 188 * which means we're a zio interrupt thread. We can't 189 * call dsl_deadlist_insert() now because it may block 190 * waiting for I/O. Instead, put bp on the deferred 191 * queue and let dsl_pool_sync() finish the job. 192 */ 193 bplist_append(&ds->ds_pending_deadlist, bp); 194 } else { 195 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 196 } 197 ASSERT3U(ds->ds_prev->ds_object, ==, 198 dsl_dataset_phys(ds)->ds_prev_snap_obj); 199 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 200 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 201 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 202 ds->ds_object && bp->blk_birth > 203 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 204 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 205 mutex_enter(&ds->ds_prev->ds_lock); 206 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 207 mutex_exit(&ds->ds_prev->ds_lock); 208 } 209 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 210 dsl_dir_transfer_space(ds->ds_dir, used, 211 DD_USED_HEAD, DD_USED_SNAP, tx); 212 } 213 } 214 mutex_enter(&ds->ds_lock); 215 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 216 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 217 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 218 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 219 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 220 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 221 mutex_exit(&ds->ds_lock); 222 223 return (used); 224} 225 226uint64_t 227dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 228{ 229 uint64_t trysnap = 0; 230 231 if (ds == NULL) 232 return (0); 233 /* 234 * The snapshot creation could fail, but that would cause an 235 * incorrect FALSE return, which would only result in an 236 * overestimation of the amount of space that an operation would 237 * consume, which is OK. 238 * 239 * There's also a small window where we could miss a pending 240 * snapshot, because we could set the sync task in the quiescing 241 * phase. So this should only be used as a guess. 242 */ 243 if (ds->ds_trysnap_txg > 244 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 245 trysnap = ds->ds_trysnap_txg; 246 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 247} 248 249boolean_t 250dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 251 uint64_t blk_birth) 252{ 253 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 254 (bp != NULL && BP_IS_HOLE(bp))) 255 return (B_FALSE); 256 257 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 258 259 return (B_TRUE); 260} 261 262/* ARGSUSED */ 263static void 264dsl_dataset_evict(dmu_buf_t *db, void *dsv) 265{ 266 dsl_dataset_t *ds = dsv; 267 268 ASSERT(ds->ds_owner == NULL); 269 270 unique_remove(ds->ds_fsid_guid); 271 272 if (ds->ds_objset != NULL) 273 dmu_objset_evict(ds->ds_objset); 274 275 if (ds->ds_prev) { 276 dsl_dataset_rele(ds->ds_prev, ds); 277 ds->ds_prev = NULL; 278 } 279 280 bplist_destroy(&ds->ds_pending_deadlist); 281 if (dsl_dataset_phys(ds)->ds_deadlist_obj != 0) 282 dsl_deadlist_close(&ds->ds_deadlist); 283 if (ds->ds_dir) 284 dsl_dir_rele(ds->ds_dir, ds); 285 286 ASSERT(!list_link_active(&ds->ds_synced_link)); 287 288 if (mutex_owned(&ds->ds_lock)) 289 mutex_exit(&ds->ds_lock); 290 mutex_destroy(&ds->ds_lock); 291 if (mutex_owned(&ds->ds_opening_lock)) 292 mutex_exit(&ds->ds_opening_lock); 293 mutex_destroy(&ds->ds_opening_lock); 294 mutex_destroy(&ds->ds_sendstream_lock); 295 refcount_destroy(&ds->ds_longholds); 296 297 kmem_free(ds, sizeof (dsl_dataset_t)); 298} 299 300int 301dsl_dataset_get_snapname(dsl_dataset_t *ds) 302{ 303 dsl_dataset_phys_t *headphys; 304 int err; 305 dmu_buf_t *headdbuf; 306 dsl_pool_t *dp = ds->ds_dir->dd_pool; 307 objset_t *mos = dp->dp_meta_objset; 308 309 if (ds->ds_snapname[0]) 310 return (0); 311 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 312 return (0); 313 314 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 315 FTAG, &headdbuf); 316 if (err != 0) 317 return (err); 318 headphys = headdbuf->db_data; 319 err = zap_value_search(dp->dp_meta_objset, 320 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 321 dmu_buf_rele(headdbuf, FTAG); 322 return (err); 323} 324 325int 326dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 327{ 328 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 329 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 330 matchtype_t mt; 331 int err; 332 333 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 334 mt = MT_FIRST; 335 else 336 mt = MT_EXACT; 337 338 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 339 value, mt, NULL, 0, NULL); 340 if (err == ENOTSUP && mt == MT_FIRST) 341 err = zap_lookup(mos, snapobj, name, 8, 1, value); 342 return (err); 343} 344 345int 346dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 347 boolean_t adj_cnt) 348{ 349 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 350 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 351 matchtype_t mt; 352 int err; 353 354 dsl_dir_snap_cmtime_update(ds->ds_dir); 355 356 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 357 mt = MT_FIRST; 358 else 359 mt = MT_EXACT; 360 361 err = zap_remove_norm(mos, snapobj, name, mt, tx); 362 if (err == ENOTSUP && mt == MT_FIRST) 363 err = zap_remove(mos, snapobj, name, tx); 364 365 if (err == 0 && adj_cnt) 366 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 367 DD_FIELD_SNAPSHOT_COUNT, tx); 368 369 return (err); 370} 371 372int 373dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 374 dsl_dataset_t **dsp) 375{ 376 objset_t *mos = dp->dp_meta_objset; 377 dmu_buf_t *dbuf; 378 dsl_dataset_t *ds; 379 int err; 380 dmu_object_info_t doi; 381 382 ASSERT(dsl_pool_config_held(dp)); 383 384 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 385 if (err != 0) 386 return (err); 387 388 /* Make sure dsobj has the correct object type. */ 389 dmu_object_info_from_db(dbuf, &doi); 390 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 391 dmu_buf_rele(dbuf, tag); 392 return (SET_ERROR(EINVAL)); 393 } 394 395 ds = dmu_buf_get_user(dbuf); 396 if (ds == NULL) { 397 dsl_dataset_t *winner = NULL; 398 399 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 400 ds->ds_dbuf = dbuf; 401 ds->ds_object = dsobj; 402 403 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 404 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 405 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 406 refcount_create(&ds->ds_longholds); 407 408 bplist_create(&ds->ds_pending_deadlist); 409 dsl_deadlist_open(&ds->ds_deadlist, 410 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 411 412 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 413 offsetof(dmu_sendarg_t, dsa_link)); 414 415 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 416 int zaperr = zap_contains(mos, dsobj, DS_FIELD_LARGE_BLOCKS); 417 if (zaperr != ENOENT) { 418 VERIFY0(zaperr); 419 ds->ds_large_blocks = B_TRUE; 420 } 421 } 422 423 if (err == 0) { 424 err = dsl_dir_hold_obj(dp, 425 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, 426 &ds->ds_dir); 427 } 428 if (err != 0) { 429 mutex_destroy(&ds->ds_lock); 430 mutex_destroy(&ds->ds_opening_lock); 431 mutex_destroy(&ds->ds_sendstream_lock); 432 refcount_destroy(&ds->ds_longholds); 433 bplist_destroy(&ds->ds_pending_deadlist); 434 dsl_deadlist_close(&ds->ds_deadlist); 435 kmem_free(ds, sizeof (dsl_dataset_t)); 436 dmu_buf_rele(dbuf, tag); 437 return (err); 438 } 439 440 if (!dsl_dataset_is_snapshot(ds)) { 441 ds->ds_snapname[0] = '\0'; 442 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 443 err = dsl_dataset_hold_obj(dp, 444 dsl_dataset_phys(ds)->ds_prev_snap_obj, 445 ds, &ds->ds_prev); 446 } 447 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 448 int zaperr = zap_lookup(mos, ds->ds_object, 449 DS_FIELD_BOOKMARK_NAMES, 450 sizeof (ds->ds_bookmarks), 1, 451 &ds->ds_bookmarks); 452 if (zaperr != ENOENT) 453 VERIFY0(zaperr); 454 } 455 } else { 456 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 457 err = dsl_dataset_get_snapname(ds); 458 if (err == 0 && 459 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 460 err = zap_count( 461 ds->ds_dir->dd_pool->dp_meta_objset, 462 dsl_dataset_phys(ds)->ds_userrefs_obj, 463 &ds->ds_userrefs); 464 } 465 } 466 467 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 468 err = dsl_prop_get_int_ds(ds, 469 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 470 &ds->ds_reserved); 471 if (err == 0) { 472 err = dsl_prop_get_int_ds(ds, 473 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 474 &ds->ds_quota); 475 } 476 } else { 477 ds->ds_reserved = ds->ds_quota = 0; 478 } 479 480 if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds, 481 dsl_dataset_evict)) != NULL) { 482 bplist_destroy(&ds->ds_pending_deadlist); 483 dsl_deadlist_close(&ds->ds_deadlist); 484 if (ds->ds_prev) 485 dsl_dataset_rele(ds->ds_prev, ds); 486 dsl_dir_rele(ds->ds_dir, ds); 487 mutex_destroy(&ds->ds_lock); 488 mutex_destroy(&ds->ds_opening_lock); 489 mutex_destroy(&ds->ds_sendstream_lock); 490 refcount_destroy(&ds->ds_longholds); 491 kmem_free(ds, sizeof (dsl_dataset_t)); 492 if (err != 0) { 493 dmu_buf_rele(dbuf, tag); 494 return (err); 495 } 496 ds = winner; 497 } else { 498 ds->ds_fsid_guid = 499 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 500 } 501 } 502 ASSERT3P(ds->ds_dbuf, ==, dbuf); 503 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 504 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 505 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 506 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 507 *dsp = ds; 508 return (0); 509} 510 511int 512dsl_dataset_hold(dsl_pool_t *dp, const char *name, 513 void *tag, dsl_dataset_t **dsp) 514{ 515 dsl_dir_t *dd; 516 const char *snapname; 517 uint64_t obj; 518 int err = 0; 519 520 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 521 if (err != 0) 522 return (err); 523 524 ASSERT(dsl_pool_config_held(dp)); 525 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 526 if (obj != 0) 527 err = dsl_dataset_hold_obj(dp, obj, tag, dsp); 528 else 529 err = SET_ERROR(ENOENT); 530 531 /* we may be looking for a snapshot */ 532 if (err == 0 && snapname != NULL) { 533 dsl_dataset_t *ds; 534 535 if (*snapname++ != '@') { 536 dsl_dataset_rele(*dsp, tag); 537 dsl_dir_rele(dd, FTAG); 538 return (SET_ERROR(ENOENT)); 539 } 540 541 dprintf("looking for snapshot '%s'\n", snapname); 542 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 543 if (err == 0) 544 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 545 dsl_dataset_rele(*dsp, tag); 546 547 if (err == 0) { 548 mutex_enter(&ds->ds_lock); 549 if (ds->ds_snapname[0] == 0) 550 (void) strlcpy(ds->ds_snapname, snapname, 551 sizeof (ds->ds_snapname)); 552 mutex_exit(&ds->ds_lock); 553 *dsp = ds; 554 } 555 } 556 557 dsl_dir_rele(dd, FTAG); 558 return (err); 559} 560 561int 562dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 563 void *tag, dsl_dataset_t **dsp) 564{ 565 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 566 if (err != 0) 567 return (err); 568 if (!dsl_dataset_tryown(*dsp, tag)) { 569 dsl_dataset_rele(*dsp, tag); 570 *dsp = NULL; 571 return (SET_ERROR(EBUSY)); 572 } 573 return (0); 574} 575 576int 577dsl_dataset_own(dsl_pool_t *dp, const char *name, 578 void *tag, dsl_dataset_t **dsp) 579{ 580 int err = dsl_dataset_hold(dp, name, tag, dsp); 581 if (err != 0) 582 return (err); 583 if (!dsl_dataset_tryown(*dsp, tag)) { 584 dsl_dataset_rele(*dsp, tag); 585 return (SET_ERROR(EBUSY)); 586 } 587 return (0); 588} 589 590/* 591 * See the comment above dsl_pool_hold() for details. In summary, a long 592 * hold is used to prevent destruction of a dataset while the pool hold 593 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 594 * 595 * The dataset and pool must be held when this function is called. After it 596 * is called, the pool hold may be released while the dataset is still held 597 * and accessed. 598 */ 599void 600dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 601{ 602 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 603 (void) refcount_add(&ds->ds_longholds, tag); 604} 605 606void 607dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 608{ 609 (void) refcount_remove(&ds->ds_longholds, tag); 610} 611 612/* Return B_TRUE if there are any long holds on this dataset. */ 613boolean_t 614dsl_dataset_long_held(dsl_dataset_t *ds) 615{ 616 return (!refcount_is_zero(&ds->ds_longholds)); 617} 618 619void 620dsl_dataset_name(dsl_dataset_t *ds, char *name) 621{ 622 if (ds == NULL) { 623 (void) strcpy(name, "mos"); 624 } else { 625 dsl_dir_name(ds->ds_dir, name); 626 VERIFY0(dsl_dataset_get_snapname(ds)); 627 if (ds->ds_snapname[0]) { 628 (void) strcat(name, "@"); 629 /* 630 * We use a "recursive" mutex so that we 631 * can call dprintf_ds() with ds_lock held. 632 */ 633 if (!MUTEX_HELD(&ds->ds_lock)) { 634 mutex_enter(&ds->ds_lock); 635 (void) strcat(name, ds->ds_snapname); 636 mutex_exit(&ds->ds_lock); 637 } else { 638 (void) strcat(name, ds->ds_snapname); 639 } 640 } 641 } 642} 643 644void 645dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 646{ 647 dmu_buf_rele(ds->ds_dbuf, tag); 648} 649 650void 651dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 652{ 653 ASSERT3P(ds->ds_owner, ==, tag); 654 ASSERT(ds->ds_dbuf != NULL); 655 656 mutex_enter(&ds->ds_lock); 657 ds->ds_owner = NULL; 658 mutex_exit(&ds->ds_lock); 659 dsl_dataset_long_rele(ds, tag); 660 dsl_dataset_rele(ds, tag); 661} 662 663boolean_t 664dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 665{ 666 boolean_t gotit = FALSE; 667 668 mutex_enter(&ds->ds_lock); 669 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 670 ds->ds_owner = tag; 671 dsl_dataset_long_hold(ds, tag); 672 gotit = TRUE; 673 } 674 mutex_exit(&ds->ds_lock); 675 return (gotit); 676} 677 678uint64_t 679dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 680 uint64_t flags, dmu_tx_t *tx) 681{ 682 dsl_pool_t *dp = dd->dd_pool; 683 dmu_buf_t *dbuf; 684 dsl_dataset_phys_t *dsphys; 685 uint64_t dsobj; 686 objset_t *mos = dp->dp_meta_objset; 687 688 if (origin == NULL) 689 origin = dp->dp_origin_snap; 690 691 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 692 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 693 ASSERT(dmu_tx_is_syncing(tx)); 694 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 695 696 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 697 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 698 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 699 dmu_buf_will_dirty(dbuf, tx); 700 dsphys = dbuf->db_data; 701 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 702 dsphys->ds_dir_obj = dd->dd_object; 703 dsphys->ds_flags = flags; 704 dsphys->ds_fsid_guid = unique_create(); 705 do { 706 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 707 sizeof (dsphys->ds_guid)); 708 } while (dsphys->ds_guid == 0); 709 dsphys->ds_snapnames_zapobj = 710 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 711 DMU_OT_NONE, 0, tx); 712 dsphys->ds_creation_time = gethrestime_sec(); 713 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 714 715 if (origin == NULL) { 716 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 717 } else { 718 dsl_dataset_t *ohds; /* head of the origin snapshot */ 719 720 dsphys->ds_prev_snap_obj = origin->ds_object; 721 dsphys->ds_prev_snap_txg = 722 dsl_dataset_phys(origin)->ds_creation_txg; 723 dsphys->ds_referenced_bytes = 724 dsl_dataset_phys(origin)->ds_referenced_bytes; 725 dsphys->ds_compressed_bytes = 726 dsl_dataset_phys(origin)->ds_compressed_bytes; 727 dsphys->ds_uncompressed_bytes = 728 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 729 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 730 731 /* 732 * Inherit flags that describe the dataset's contents 733 * (INCONSISTENT) or properties (Case Insensitive). 734 */ 735 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 736 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 737 738 if (origin->ds_large_blocks) 739 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); 740 741 dmu_buf_will_dirty(origin->ds_dbuf, tx); 742 dsl_dataset_phys(origin)->ds_num_children++; 743 744 VERIFY0(dsl_dataset_hold_obj(dp, 745 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 746 FTAG, &ohds)); 747 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 748 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 749 dsl_dataset_rele(ohds, FTAG); 750 751 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 752 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 753 dsl_dataset_phys(origin)->ds_next_clones_obj = 754 zap_create(mos, 755 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 756 } 757 VERIFY0(zap_add_int(mos, 758 dsl_dataset_phys(origin)->ds_next_clones_obj, 759 dsobj, tx)); 760 } 761 762 dmu_buf_will_dirty(dd->dd_dbuf, tx); 763 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 764 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 765 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 766 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 767 dsl_dir_phys(origin->ds_dir)->dd_clones = 768 zap_create(mos, 769 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 770 } 771 VERIFY0(zap_add_int(mos, 772 dsl_dir_phys(origin->ds_dir)->dd_clones, 773 dsobj, tx)); 774 } 775 } 776 777 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 778 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 779 780 dmu_buf_rele(dbuf, FTAG); 781 782 dmu_buf_will_dirty(dd->dd_dbuf, tx); 783 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 784 785 return (dsobj); 786} 787 788static void 789dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 790{ 791 objset_t *os; 792 793 VERIFY0(dmu_objset_from_ds(ds, &os)); 794 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 795 dsl_dataset_dirty(ds, tx); 796} 797 798uint64_t 799dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 800 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 801{ 802 dsl_pool_t *dp = pdd->dd_pool; 803 uint64_t dsobj, ddobj; 804 dsl_dir_t *dd; 805 806 ASSERT(dmu_tx_is_syncing(tx)); 807 ASSERT(lastname[0] != '@'); 808 809 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 810 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 811 812 dsobj = dsl_dataset_create_sync_dd(dd, origin, 813 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 814 815 dsl_deleg_set_create_perms(dd, tx, cr); 816 817 /* 818 * Since we're creating a new node we know it's a leaf, so we can 819 * initialize the counts if the limit feature is active. 820 */ 821 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 822 uint64_t cnt = 0; 823 objset_t *os = dd->dd_pool->dp_meta_objset; 824 825 dsl_dir_zapify(dd, tx); 826 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 827 sizeof (cnt), 1, &cnt, tx)); 828 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 829 sizeof (cnt), 1, &cnt, tx)); 830 } 831 832 dsl_dir_rele(dd, FTAG); 833 834 /* 835 * If we are creating a clone, make sure we zero out any stale 836 * data from the origin snapshots zil header. 837 */ 838 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 839 dsl_dataset_t *ds; 840 841 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 842 dsl_dataset_zero_zil(ds, tx); 843 dsl_dataset_rele(ds, FTAG); 844 } 845 846 return (dsobj); 847} 848 849#ifdef __FreeBSD__ 850/* FreeBSD ioctl compat begin */ 851struct destroyarg { 852 nvlist_t *nvl; 853 const char *snapname; 854}; 855 856static int 857dsl_check_snap_cb(const char *name, void *arg) 858{ 859 struct destroyarg *da = arg; 860 dsl_dataset_t *ds; 861 char *dsname; 862 863 dsname = kmem_asprintf("%s@%s", name, da->snapname); 864 fnvlist_add_boolean(da->nvl, dsname); 865 kmem_free(dsname, strlen(dsname) + 1); 866 867 return (0); 868} 869 870int 871dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 872 nvlist_t *snaps) 873{ 874 struct destroyarg *da; 875 int err; 876 877 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 878 da->nvl = snaps; 879 da->snapname = snapname; 880 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 881 DS_FIND_CHILDREN); 882 kmem_free(da, sizeof (struct destroyarg)); 883 884 return (err); 885} 886/* FreeBSD ioctl compat end */ 887#endif /* __FreeBSD__ */ 888 889/* 890 * The unique space in the head dataset can be calculated by subtracting 891 * the space used in the most recent snapshot, that is still being used 892 * in this file system, from the space currently in use. To figure out 893 * the space in the most recent snapshot still in use, we need to take 894 * the total space used in the snapshot and subtract out the space that 895 * has been freed up since the snapshot was taken. 896 */ 897void 898dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 899{ 900 uint64_t mrs_used; 901 uint64_t dlused, dlcomp, dluncomp; 902 903 ASSERT(!dsl_dataset_is_snapshot(ds)); 904 905 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 906 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 907 else 908 mrs_used = 0; 909 910 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 911 912 ASSERT3U(dlused, <=, mrs_used); 913 dsl_dataset_phys(ds)->ds_unique_bytes = 914 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 915 916 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 917 SPA_VERSION_UNIQUE_ACCURATE) 918 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 919} 920 921void 922dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 923 dmu_tx_t *tx) 924{ 925 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 926 uint64_t count; 927 int err; 928 929 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 930 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 931 obj, tx); 932 /* 933 * The err should not be ENOENT, but a bug in a previous version 934 * of the code could cause upgrade_clones_cb() to not set 935 * ds_next_snap_obj when it should, leading to a missing entry. 936 * If we knew that the pool was created after 937 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 938 * ENOENT. However, at least we can check that we don't have 939 * too many entries in the next_clones_obj even after failing to 940 * remove this one. 941 */ 942 if (err != ENOENT) 943 VERIFY0(err); 944 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 945 &count)); 946 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 947} 948 949 950blkptr_t * 951dsl_dataset_get_blkptr(dsl_dataset_t *ds) 952{ 953 return (&dsl_dataset_phys(ds)->ds_bp); 954} 955 956void 957dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 958{ 959 ASSERT(dmu_tx_is_syncing(tx)); 960 /* If it's the meta-objset, set dp_meta_rootbp */ 961 if (ds == NULL) { 962 tx->tx_pool->dp_meta_rootbp = *bp; 963 } else { 964 dmu_buf_will_dirty(ds->ds_dbuf, tx); 965 dsl_dataset_phys(ds)->ds_bp = *bp; 966 } 967} 968 969spa_t * 970dsl_dataset_get_spa(dsl_dataset_t *ds) 971{ 972 return (ds->ds_dir->dd_pool->dp_spa); 973} 974 975void 976dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 977{ 978 dsl_pool_t *dp; 979 980 if (ds == NULL) /* this is the meta-objset */ 981 return; 982 983 ASSERT(ds->ds_objset != NULL); 984 985 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 986 panic("dirtying snapshot!"); 987 988 dp = ds->ds_dir->dd_pool; 989 990 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 991 /* up the hold count until we can be written out */ 992 dmu_buf_add_ref(ds->ds_dbuf, ds); 993 } 994} 995 996boolean_t 997dsl_dataset_is_dirty(dsl_dataset_t *ds) 998{ 999 for (int t = 0; t < TXG_SIZE; t++) { 1000 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1001 ds, t)) 1002 return (B_TRUE); 1003 } 1004 return (B_FALSE); 1005} 1006 1007static int 1008dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1009{ 1010 uint64_t asize; 1011 1012 if (!dmu_tx_is_syncing(tx)) 1013 return (0); 1014 1015 /* 1016 * If there's an fs-only reservation, any blocks that might become 1017 * owned by the snapshot dataset must be accommodated by space 1018 * outside of the reservation. 1019 */ 1020 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1021 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1022 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1023 return (SET_ERROR(ENOSPC)); 1024 1025 /* 1026 * Propagate any reserved space for this snapshot to other 1027 * snapshot checks in this sync group. 1028 */ 1029 if (asize > 0) 1030 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1031 1032 return (0); 1033} 1034 1035typedef struct dsl_dataset_snapshot_arg { 1036 nvlist_t *ddsa_snaps; 1037 nvlist_t *ddsa_props; 1038 nvlist_t *ddsa_errors; 1039 cred_t *ddsa_cr; 1040} dsl_dataset_snapshot_arg_t; 1041 1042int 1043dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1044 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1045{ 1046 int error; 1047 uint64_t value; 1048 1049 ds->ds_trysnap_txg = tx->tx_txg; 1050 1051 if (!dmu_tx_is_syncing(tx)) 1052 return (0); 1053 1054 /* 1055 * We don't allow multiple snapshots of the same txg. If there 1056 * is already one, try again. 1057 */ 1058 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1059 return (SET_ERROR(EAGAIN)); 1060 1061 /* 1062 * Check for conflicting snapshot name. 1063 */ 1064 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1065 if (error == 0) 1066 return (SET_ERROR(EEXIST)); 1067 if (error != ENOENT) 1068 return (error); 1069 1070 /* 1071 * We don't allow taking snapshots of inconsistent datasets, such as 1072 * those into which we are currently receiving. However, if we are 1073 * creating this snapshot as part of a receive, this check will be 1074 * executed atomically with respect to the completion of the receive 1075 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1076 * case we ignore this, knowing it will be fixed up for us shortly in 1077 * dmu_recv_end_sync(). 1078 */ 1079 if (!recv && DS_IS_INCONSISTENT(ds)) 1080 return (SET_ERROR(EBUSY)); 1081 1082 /* 1083 * Skip the check for temporary snapshots or if we have already checked 1084 * the counts in dsl_dataset_snapshot_check. This means we really only 1085 * check the count here when we're receiving a stream. 1086 */ 1087 if (cnt != 0 && cr != NULL) { 1088 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1089 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1090 if (error != 0) 1091 return (error); 1092 } 1093 1094 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1095 if (error != 0) 1096 return (error); 1097 1098 return (0); 1099} 1100 1101static int 1102dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1103{ 1104 dsl_dataset_snapshot_arg_t *ddsa = arg; 1105 dsl_pool_t *dp = dmu_tx_pool(tx); 1106 nvpair_t *pair; 1107 int rv = 0; 1108 1109 /* 1110 * Pre-compute how many total new snapshots will be created for each 1111 * level in the tree and below. This is needed for validating the 1112 * snapshot limit when either taking a recursive snapshot or when 1113 * taking multiple snapshots. 1114 * 1115 * The problem is that the counts are not actually adjusted when 1116 * we are checking, only when we finally sync. For a single snapshot, 1117 * this is easy, the count will increase by 1 at each node up the tree, 1118 * but its more complicated for the recursive/multiple snapshot case. 1119 * 1120 * The dsl_fs_ss_limit_check function does recursively check the count 1121 * at each level up the tree but since it is validating each snapshot 1122 * independently we need to be sure that we are validating the complete 1123 * count for the entire set of snapshots. We do this by rolling up the 1124 * counts for each component of the name into an nvlist and then 1125 * checking each of those cases with the aggregated count. 1126 * 1127 * This approach properly handles not only the recursive snapshot 1128 * case (where we get all of those on the ddsa_snaps list) but also 1129 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1130 * validate the limit on 'a' using a count of 2). 1131 * 1132 * We validate the snapshot names in the third loop and only report 1133 * name errors once. 1134 */ 1135 if (dmu_tx_is_syncing(tx)) { 1136 nvlist_t *cnt_track = NULL; 1137 cnt_track = fnvlist_alloc(); 1138 1139 /* Rollup aggregated counts into the cnt_track list */ 1140 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1141 pair != NULL; 1142 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1143 char *pdelim; 1144 uint64_t val; 1145 char nm[MAXPATHLEN]; 1146 1147 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1148 pdelim = strchr(nm, '@'); 1149 if (pdelim == NULL) 1150 continue; 1151 *pdelim = '\0'; 1152 1153 do { 1154 if (nvlist_lookup_uint64(cnt_track, nm, 1155 &val) == 0) { 1156 /* update existing entry */ 1157 fnvlist_add_uint64(cnt_track, nm, 1158 val + 1); 1159 } else { 1160 /* add to list */ 1161 fnvlist_add_uint64(cnt_track, nm, 1); 1162 } 1163 1164 pdelim = strrchr(nm, '/'); 1165 if (pdelim != NULL) 1166 *pdelim = '\0'; 1167 } while (pdelim != NULL); 1168 } 1169 1170 /* Check aggregated counts at each level */ 1171 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1172 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1173 int error = 0; 1174 char *name; 1175 uint64_t cnt = 0; 1176 dsl_dataset_t *ds; 1177 1178 name = nvpair_name(pair); 1179 cnt = fnvpair_value_uint64(pair); 1180 ASSERT(cnt > 0); 1181 1182 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1183 if (error == 0) { 1184 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1185 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1186 ddsa->ddsa_cr); 1187 dsl_dataset_rele(ds, FTAG); 1188 } 1189 1190 if (error != 0) { 1191 if (ddsa->ddsa_errors != NULL) 1192 fnvlist_add_int32(ddsa->ddsa_errors, 1193 name, error); 1194 rv = error; 1195 /* only report one error for this check */ 1196 break; 1197 } 1198 } 1199 nvlist_free(cnt_track); 1200 } 1201 1202 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1203 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1204 int error = 0; 1205 dsl_dataset_t *ds; 1206 char *name, *atp; 1207 char dsname[MAXNAMELEN]; 1208 1209 name = nvpair_name(pair); 1210 if (strlen(name) >= MAXNAMELEN) 1211 error = SET_ERROR(ENAMETOOLONG); 1212 if (error == 0) { 1213 atp = strchr(name, '@'); 1214 if (atp == NULL) 1215 error = SET_ERROR(EINVAL); 1216 if (error == 0) 1217 (void) strlcpy(dsname, name, atp - name + 1); 1218 } 1219 if (error == 0) 1220 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1221 if (error == 0) { 1222 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1223 error = dsl_dataset_snapshot_check_impl(ds, 1224 atp + 1, tx, B_FALSE, 0, NULL); 1225 dsl_dataset_rele(ds, FTAG); 1226 } 1227 1228 if (error != 0) { 1229 if (ddsa->ddsa_errors != NULL) { 1230 fnvlist_add_int32(ddsa->ddsa_errors, 1231 name, error); 1232 } 1233 rv = error; 1234 } 1235 } 1236 1237 return (rv); 1238} 1239 1240void 1241dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1242 dmu_tx_t *tx) 1243{ 1244 static zil_header_t zero_zil; 1245 1246 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1247 dmu_buf_t *dbuf; 1248 dsl_dataset_phys_t *dsphys; 1249 uint64_t dsobj, crtxg; 1250 objset_t *mos = dp->dp_meta_objset; 1251 objset_t *os; 1252 1253 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1254 1255 /* 1256 * If we are on an old pool, the zil must not be active, in which 1257 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1258 */ 1259 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1260 dmu_objset_from_ds(ds, &os) != 0 || 1261 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1262 sizeof (zero_zil)) == 0); 1263 1264 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1265 1266 /* 1267 * The origin's ds_creation_txg has to be < TXG_INITIAL 1268 */ 1269 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1270 crtxg = 1; 1271 else 1272 crtxg = tx->tx_txg; 1273 1274 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1275 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1276 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1277 dmu_buf_will_dirty(dbuf, tx); 1278 dsphys = dbuf->db_data; 1279 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1280 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1281 dsphys->ds_fsid_guid = unique_create(); 1282 do { 1283 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1284 sizeof (dsphys->ds_guid)); 1285 } while (dsphys->ds_guid == 0); 1286 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1287 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1288 dsphys->ds_next_snap_obj = ds->ds_object; 1289 dsphys->ds_num_children = 1; 1290 dsphys->ds_creation_time = gethrestime_sec(); 1291 dsphys->ds_creation_txg = crtxg; 1292 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1293 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1294 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1295 dsphys->ds_uncompressed_bytes = 1296 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1297 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1298 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1299 dmu_buf_rele(dbuf, FTAG); 1300 1301 if (ds->ds_large_blocks) 1302 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); 1303 1304 ASSERT3U(ds->ds_prev != 0, ==, 1305 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1306 if (ds->ds_prev) { 1307 uint64_t next_clones_obj = 1308 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1309 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1310 ds->ds_object || 1311 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1312 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1313 ds->ds_object) { 1314 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1315 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1316 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1317 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1318 } else if (next_clones_obj != 0) { 1319 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1320 dsphys->ds_next_snap_obj, tx); 1321 VERIFY0(zap_add_int(mos, 1322 next_clones_obj, dsobj, tx)); 1323 } 1324 } 1325 1326 /* 1327 * If we have a reference-reservation on this dataset, we will 1328 * need to increase the amount of refreservation being charged 1329 * since our unique space is going to zero. 1330 */ 1331 if (ds->ds_reserved) { 1332 int64_t delta; 1333 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1334 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1335 ds->ds_reserved); 1336 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1337 delta, 0, 0, tx); 1338 } 1339 1340 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1341 dsl_dataset_phys(ds)->ds_deadlist_obj = 1342 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1343 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1344 dsl_deadlist_close(&ds->ds_deadlist); 1345 dsl_deadlist_open(&ds->ds_deadlist, mos, 1346 dsl_dataset_phys(ds)->ds_deadlist_obj); 1347 dsl_deadlist_add_key(&ds->ds_deadlist, 1348 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1349 1350 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1351 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1352 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1353 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1354 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1355 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1356 1357 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1358 snapname, 8, 1, &dsobj, tx)); 1359 1360 if (ds->ds_prev) 1361 dsl_dataset_rele(ds->ds_prev, ds); 1362 VERIFY0(dsl_dataset_hold_obj(dp, 1363 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1364 1365 dsl_scan_ds_snapshotted(ds, tx); 1366 1367 dsl_dir_snap_cmtime_update(ds->ds_dir); 1368 1369 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1370} 1371 1372static void 1373dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1374{ 1375 dsl_dataset_snapshot_arg_t *ddsa = arg; 1376 dsl_pool_t *dp = dmu_tx_pool(tx); 1377 nvpair_t *pair; 1378 1379 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1380 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1381 dsl_dataset_t *ds; 1382 char *name, *atp; 1383 char dsname[MAXNAMELEN]; 1384 1385 name = nvpair_name(pair); 1386 atp = strchr(name, '@'); 1387 (void) strlcpy(dsname, name, atp - name + 1); 1388 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1389 1390 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1391 if (ddsa->ddsa_props != NULL) { 1392 dsl_props_set_sync_impl(ds->ds_prev, 1393 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1394 } 1395 dsl_dataset_rele(ds, FTAG); 1396 } 1397} 1398 1399/* 1400 * The snapshots must all be in the same pool. 1401 * All-or-nothing: if there are any failures, nothing will be modified. 1402 */ 1403int 1404dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1405{ 1406 dsl_dataset_snapshot_arg_t ddsa; 1407 nvpair_t *pair; 1408 boolean_t needsuspend; 1409 int error; 1410 spa_t *spa; 1411 char *firstname; 1412 nvlist_t *suspended = NULL; 1413 1414 pair = nvlist_next_nvpair(snaps, NULL); 1415 if (pair == NULL) 1416 return (0); 1417 firstname = nvpair_name(pair); 1418 1419 error = spa_open(firstname, &spa, FTAG); 1420 if (error != 0) 1421 return (error); 1422 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1423 spa_close(spa, FTAG); 1424 1425 if (needsuspend) { 1426 suspended = fnvlist_alloc(); 1427 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1428 pair = nvlist_next_nvpair(snaps, pair)) { 1429 char fsname[MAXNAMELEN]; 1430 char *snapname = nvpair_name(pair); 1431 char *atp; 1432 void *cookie; 1433 1434 atp = strchr(snapname, '@'); 1435 if (atp == NULL) { 1436 error = SET_ERROR(EINVAL); 1437 break; 1438 } 1439 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1440 1441 error = zil_suspend(fsname, &cookie); 1442 if (error != 0) 1443 break; 1444 fnvlist_add_uint64(suspended, fsname, 1445 (uintptr_t)cookie); 1446 } 1447 } 1448 1449 ddsa.ddsa_snaps = snaps; 1450 ddsa.ddsa_props = props; 1451 ddsa.ddsa_errors = errors; 1452 ddsa.ddsa_cr = CRED(); 1453 1454 if (error == 0) { 1455 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1456 dsl_dataset_snapshot_sync, &ddsa, 1457 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1458 } 1459 1460 if (suspended != NULL) { 1461 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1462 pair = nvlist_next_nvpair(suspended, pair)) { 1463 zil_resume((void *)(uintptr_t) 1464 fnvpair_value_uint64(pair)); 1465 } 1466 fnvlist_free(suspended); 1467 } 1468 1469#ifdef __FreeBSD__ 1470#ifdef _KERNEL 1471 if (error == 0) { 1472 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1473 pair = nvlist_next_nvpair(snaps, pair)) { 1474 char *snapname = nvpair_name(pair); 1475 zvol_create_minors(snapname); 1476 } 1477 } 1478#endif 1479#endif 1480 return (error); 1481} 1482 1483typedef struct dsl_dataset_snapshot_tmp_arg { 1484 const char *ddsta_fsname; 1485 const char *ddsta_snapname; 1486 minor_t ddsta_cleanup_minor; 1487 const char *ddsta_htag; 1488} dsl_dataset_snapshot_tmp_arg_t; 1489 1490static int 1491dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1492{ 1493 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1494 dsl_pool_t *dp = dmu_tx_pool(tx); 1495 dsl_dataset_t *ds; 1496 int error; 1497 1498 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1499 if (error != 0) 1500 return (error); 1501 1502 /* NULL cred means no limit check for tmp snapshot */ 1503 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1504 tx, B_FALSE, 0, NULL); 1505 if (error != 0) { 1506 dsl_dataset_rele(ds, FTAG); 1507 return (error); 1508 } 1509 1510 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1511 dsl_dataset_rele(ds, FTAG); 1512 return (SET_ERROR(ENOTSUP)); 1513 } 1514 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1515 B_TRUE, tx); 1516 if (error != 0) { 1517 dsl_dataset_rele(ds, FTAG); 1518 return (error); 1519 } 1520 1521 dsl_dataset_rele(ds, FTAG); 1522 return (0); 1523} 1524 1525static void 1526dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1527{ 1528 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1529 dsl_pool_t *dp = dmu_tx_pool(tx); 1530 dsl_dataset_t *ds; 1531 1532 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1533 1534 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1535 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1536 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1537 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1538 1539 dsl_dataset_rele(ds, FTAG); 1540} 1541 1542int 1543dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1544 minor_t cleanup_minor, const char *htag) 1545{ 1546 dsl_dataset_snapshot_tmp_arg_t ddsta; 1547 int error; 1548 spa_t *spa; 1549 boolean_t needsuspend; 1550 void *cookie; 1551 1552 ddsta.ddsta_fsname = fsname; 1553 ddsta.ddsta_snapname = snapname; 1554 ddsta.ddsta_cleanup_minor = cleanup_minor; 1555 ddsta.ddsta_htag = htag; 1556 1557 error = spa_open(fsname, &spa, FTAG); 1558 if (error != 0) 1559 return (error); 1560 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1561 spa_close(spa, FTAG); 1562 1563 if (needsuspend) { 1564 error = zil_suspend(fsname, &cookie); 1565 if (error != 0) 1566 return (error); 1567 } 1568 1569 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1570 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1571 1572 if (needsuspend) 1573 zil_resume(cookie); 1574 return (error); 1575} 1576 1577 1578void 1579dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1580{ 1581 ASSERT(dmu_tx_is_syncing(tx)); 1582 ASSERT(ds->ds_objset != NULL); 1583 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1584 1585 /* 1586 * in case we had to change ds_fsid_guid when we opened it, 1587 * sync it out now. 1588 */ 1589 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1590 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1591 1592 dmu_objset_sync(ds->ds_objset, zio, tx); 1593 1594 if (ds->ds_need_large_blocks && !ds->ds_large_blocks) { 1595 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); 1596 ds->ds_large_blocks = B_TRUE; 1597 } 1598} 1599 1600static void 1601get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1602{ 1603 uint64_t count = 0; 1604 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1605 zap_cursor_t zc; 1606 zap_attribute_t za; 1607 nvlist_t *propval = fnvlist_alloc(); 1608 nvlist_t *val = fnvlist_alloc(); 1609 1610 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1611 1612 /* 1613 * There may be missing entries in ds_next_clones_obj 1614 * due to a bug in a previous version of the code. 1615 * Only trust it if it has the right number of entries. 1616 */ 1617 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1618 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1619 &count)); 1620 } 1621 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1622 goto fail; 1623 for (zap_cursor_init(&zc, mos, 1624 dsl_dataset_phys(ds)->ds_next_clones_obj); 1625 zap_cursor_retrieve(&zc, &za) == 0; 1626 zap_cursor_advance(&zc)) { 1627 dsl_dataset_t *clone; 1628 char buf[ZFS_MAXNAMELEN]; 1629 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1630 za.za_first_integer, FTAG, &clone)); 1631 dsl_dir_name(clone->ds_dir, buf); 1632 fnvlist_add_boolean(val, buf); 1633 dsl_dataset_rele(clone, FTAG); 1634 } 1635 zap_cursor_fini(&zc); 1636 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1637 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1638fail: 1639 nvlist_free(val); 1640 nvlist_free(propval); 1641} 1642 1643void 1644dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1645{ 1646 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1647 uint64_t refd, avail, uobjs, aobjs, ratio; 1648 1649 ASSERT(dsl_pool_config_held(dp)); 1650 1651 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1652 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1653 dsl_dataset_phys(ds)->ds_compressed_bytes); 1654 1655 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1656 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1657 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1658 1659 if (dsl_dataset_is_snapshot(ds)) { 1660 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1661 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1662 dsl_dataset_phys(ds)->ds_unique_bytes); 1663 get_clones_stat(ds, nv); 1664 } else { 1665 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1666 char buf[MAXNAMELEN]; 1667 dsl_dataset_name(ds->ds_prev, buf); 1668 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1669 } 1670 1671 dsl_dir_stats(ds->ds_dir, nv); 1672 } 1673 1674 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1675 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1676 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1677 1678 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1679 dsl_dataset_phys(ds)->ds_creation_time); 1680 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1681 dsl_dataset_phys(ds)->ds_creation_txg); 1682 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1683 ds->ds_quota); 1684 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1685 ds->ds_reserved); 1686 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1687 dsl_dataset_phys(ds)->ds_guid); 1688 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1689 dsl_dataset_phys(ds)->ds_unique_bytes); 1690 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1691 ds->ds_object); 1692 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1693 ds->ds_userrefs); 1694 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1695 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1696 1697 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1698 uint64_t written, comp, uncomp; 1699 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1700 dsl_dataset_t *prev; 1701 1702 int err = dsl_dataset_hold_obj(dp, 1703 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1704 if (err == 0) { 1705 err = dsl_dataset_space_written(prev, ds, &written, 1706 &comp, &uncomp); 1707 dsl_dataset_rele(prev, FTAG); 1708 if (err == 0) { 1709 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1710 written); 1711 } 1712 } 1713 } 1714} 1715 1716void 1717dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1718{ 1719 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1720 ASSERT(dsl_pool_config_held(dp)); 1721 1722 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1723 stat->dds_inconsistent = 1724 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1725 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1726 stat->dds_origin[0] = '\0'; 1727 if (dsl_dataset_is_snapshot(ds)) { 1728 stat->dds_is_snapshot = B_TRUE; 1729 stat->dds_num_clones = 1730 dsl_dataset_phys(ds)->ds_num_children - 1; 1731 } else { 1732 stat->dds_is_snapshot = B_FALSE; 1733 stat->dds_num_clones = 0; 1734 1735 if (dsl_dir_is_clone(ds->ds_dir)) { 1736 dsl_dataset_t *ods; 1737 1738 VERIFY0(dsl_dataset_hold_obj(dp, 1739 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1740 FTAG, &ods)); 1741 dsl_dataset_name(ods, stat->dds_origin); 1742 dsl_dataset_rele(ods, FTAG); 1743 } 1744 } 1745} 1746 1747uint64_t 1748dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1749{ 1750 return (ds->ds_fsid_guid); 1751} 1752 1753void 1754dsl_dataset_space(dsl_dataset_t *ds, 1755 uint64_t *refdbytesp, uint64_t *availbytesp, 1756 uint64_t *usedobjsp, uint64_t *availobjsp) 1757{ 1758 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1759 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1760 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1761 *availbytesp += 1762 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1763 if (ds->ds_quota != 0) { 1764 /* 1765 * Adjust available bytes according to refquota 1766 */ 1767 if (*refdbytesp < ds->ds_quota) 1768 *availbytesp = MIN(*availbytesp, 1769 ds->ds_quota - *refdbytesp); 1770 else 1771 *availbytesp = 0; 1772 } 1773 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1774 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1775} 1776 1777boolean_t 1778dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1779{ 1780 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1781 1782 ASSERT(dsl_pool_config_held(dp)); 1783 if (snap == NULL) 1784 return (B_FALSE); 1785 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1786 dsl_dataset_phys(snap)->ds_creation_txg) { 1787 objset_t *os, *os_snap; 1788 /* 1789 * It may be that only the ZIL differs, because it was 1790 * reset in the head. Don't count that as being 1791 * modified. 1792 */ 1793 if (dmu_objset_from_ds(ds, &os) != 0) 1794 return (B_TRUE); 1795 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1796 return (B_TRUE); 1797 return (bcmp(&os->os_phys->os_meta_dnode, 1798 &os_snap->os_phys->os_meta_dnode, 1799 sizeof (os->os_phys->os_meta_dnode)) != 0); 1800 } 1801 return (B_FALSE); 1802} 1803 1804typedef struct dsl_dataset_rename_snapshot_arg { 1805 const char *ddrsa_fsname; 1806 const char *ddrsa_oldsnapname; 1807 const char *ddrsa_newsnapname; 1808 boolean_t ddrsa_recursive; 1809 dmu_tx_t *ddrsa_tx; 1810} dsl_dataset_rename_snapshot_arg_t; 1811 1812/* ARGSUSED */ 1813static int 1814dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1815 dsl_dataset_t *hds, void *arg) 1816{ 1817 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1818 int error; 1819 uint64_t val; 1820 1821 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1822 if (error != 0) { 1823 /* ignore nonexistent snapshots */ 1824 return (error == ENOENT ? 0 : error); 1825 } 1826 1827 /* new name should not exist */ 1828 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1829 if (error == 0) 1830 error = SET_ERROR(EEXIST); 1831 else if (error == ENOENT) 1832 error = 0; 1833 1834 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1835 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1836 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 1837 error = SET_ERROR(ENAMETOOLONG); 1838 1839 return (error); 1840} 1841 1842static int 1843dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1844{ 1845 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1846 dsl_pool_t *dp = dmu_tx_pool(tx); 1847 dsl_dataset_t *hds; 1848 int error; 1849 1850 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1851 if (error != 0) 1852 return (error); 1853 1854 if (ddrsa->ddrsa_recursive) { 1855 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1856 dsl_dataset_rename_snapshot_check_impl, ddrsa, 1857 DS_FIND_CHILDREN); 1858 } else { 1859 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 1860 } 1861 dsl_dataset_rele(hds, FTAG); 1862 return (error); 1863} 1864 1865static int 1866dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 1867 dsl_dataset_t *hds, void *arg) 1868{ 1869#ifdef __FreeBSD__ 1870#ifdef _KERNEL 1871 char *oldname, *newname; 1872#endif 1873#endif 1874 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1875 dsl_dataset_t *ds; 1876 uint64_t val; 1877 dmu_tx_t *tx = ddrsa->ddrsa_tx; 1878 int error; 1879 1880 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1881 ASSERT(error == 0 || error == ENOENT); 1882 if (error == ENOENT) { 1883 /* ignore nonexistent snapshots */ 1884 return (0); 1885 } 1886 1887 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 1888 1889 /* log before we change the name */ 1890 spa_history_log_internal_ds(ds, "rename", tx, 1891 "-> @%s", ddrsa->ddrsa_newsnapname); 1892 1893 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 1894 B_FALSE)); 1895 mutex_enter(&ds->ds_lock); 1896 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 1897 mutex_exit(&ds->ds_lock); 1898 VERIFY0(zap_add(dp->dp_meta_objset, 1899 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 1900 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 1901 1902#ifdef __FreeBSD__ 1903#ifdef _KERNEL 1904 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1905 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1906 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1907 ddrsa->ddrsa_oldsnapname); 1908 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1909 ddrsa->ddrsa_newsnapname); 1910 zfsvfs_update_fromname(oldname, newname); 1911 zvol_rename_minors(oldname, newname); 1912 kmem_free(newname, MAXPATHLEN); 1913 kmem_free(oldname, MAXPATHLEN); 1914#endif 1915#endif 1916 dsl_dataset_rele(ds, FTAG); 1917 1918 return (0); 1919} 1920 1921static void 1922dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 1923{ 1924 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1925 dsl_pool_t *dp = dmu_tx_pool(tx); 1926 dsl_dataset_t *hds; 1927 1928 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 1929 ddrsa->ddrsa_tx = tx; 1930 if (ddrsa->ddrsa_recursive) { 1931 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1932 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 1933 DS_FIND_CHILDREN)); 1934 } else { 1935 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 1936 } 1937 dsl_dataset_rele(hds, FTAG); 1938} 1939 1940int 1941dsl_dataset_rename_snapshot(const char *fsname, 1942 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 1943{ 1944 dsl_dataset_rename_snapshot_arg_t ddrsa; 1945 1946 ddrsa.ddrsa_fsname = fsname; 1947 ddrsa.ddrsa_oldsnapname = oldsnapname; 1948 ddrsa.ddrsa_newsnapname = newsnapname; 1949 ddrsa.ddrsa_recursive = recursive; 1950 1951 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 1952 dsl_dataset_rename_snapshot_sync, &ddrsa, 1953 1, ZFS_SPACE_CHECK_RESERVED)); 1954} 1955 1956/* 1957 * If we're doing an ownership handoff, we need to make sure that there is 1958 * only one long hold on the dataset. We're not allowed to change anything here 1959 * so we don't permanently release the long hold or regular hold here. We want 1960 * to do this only when syncing to avoid the dataset unexpectedly going away 1961 * when we release the long hold. 1962 */ 1963static int 1964dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 1965{ 1966 boolean_t held; 1967 1968 if (!dmu_tx_is_syncing(tx)) 1969 return (0); 1970 1971 if (owner != NULL) { 1972 VERIFY3P(ds->ds_owner, ==, owner); 1973 dsl_dataset_long_rele(ds, owner); 1974 } 1975 1976 held = dsl_dataset_long_held(ds); 1977 1978 if (owner != NULL) 1979 dsl_dataset_long_hold(ds, owner); 1980 1981 if (held) 1982 return (SET_ERROR(EBUSY)); 1983 1984 return (0); 1985} 1986 1987typedef struct dsl_dataset_rollback_arg { 1988 const char *ddra_fsname; 1989 void *ddra_owner; 1990 nvlist_t *ddra_result; 1991} dsl_dataset_rollback_arg_t; 1992 1993static int 1994dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 1995{ 1996 dsl_dataset_rollback_arg_t *ddra = arg; 1997 dsl_pool_t *dp = dmu_tx_pool(tx); 1998 dsl_dataset_t *ds; 1999 int64_t unused_refres_delta; 2000 int error; 2001 2002 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2003 if (error != 0) 2004 return (error); 2005 2006 /* must not be a snapshot */ 2007 if (dsl_dataset_is_snapshot(ds)) { 2008 dsl_dataset_rele(ds, FTAG); 2009 return (SET_ERROR(EINVAL)); 2010 } 2011 2012 /* must have a most recent snapshot */ 2013 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2014 dsl_dataset_rele(ds, FTAG); 2015 return (SET_ERROR(EINVAL)); 2016 } 2017 2018 /* must not have any bookmarks after the most recent snapshot */ 2019 nvlist_t *proprequest = fnvlist_alloc(); 2020 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2021 nvlist_t *bookmarks = fnvlist_alloc(); 2022 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2023 fnvlist_free(proprequest); 2024 if (error != 0) 2025 return (error); 2026 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2027 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2028 nvlist_t *valuenv = 2029 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2030 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2031 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2032 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2033 fnvlist_free(bookmarks); 2034 dsl_dataset_rele(ds, FTAG); 2035 return (SET_ERROR(EEXIST)); 2036 } 2037 } 2038 fnvlist_free(bookmarks); 2039 2040 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2041 if (error != 0) { 2042 dsl_dataset_rele(ds, FTAG); 2043 return (error); 2044 } 2045 2046 /* 2047 * Check if the snap we are rolling back to uses more than 2048 * the refquota. 2049 */ 2050 if (ds->ds_quota != 0 && 2051 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2052 dsl_dataset_rele(ds, FTAG); 2053 return (SET_ERROR(EDQUOT)); 2054 } 2055 2056 /* 2057 * When we do the clone swap, we will temporarily use more space 2058 * due to the refreservation (the head will no longer have any 2059 * unique space, so the entire amount of the refreservation will need 2060 * to be free). We will immediately destroy the clone, freeing 2061 * this space, but the freeing happens over many txg's. 2062 */ 2063 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2064 dsl_dataset_phys(ds)->ds_unique_bytes); 2065 2066 if (unused_refres_delta > 0 && 2067 unused_refres_delta > 2068 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2069 dsl_dataset_rele(ds, FTAG); 2070 return (SET_ERROR(ENOSPC)); 2071 } 2072 2073 dsl_dataset_rele(ds, FTAG); 2074 return (0); 2075} 2076 2077static void 2078dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2079{ 2080 dsl_dataset_rollback_arg_t *ddra = arg; 2081 dsl_pool_t *dp = dmu_tx_pool(tx); 2082 dsl_dataset_t *ds, *clone; 2083 uint64_t cloneobj; 2084 char namebuf[ZFS_MAXNAMELEN]; 2085 2086 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2087 2088 dsl_dataset_name(ds->ds_prev, namebuf); 2089 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2090 2091 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2092 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2093 2094 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2095 2096 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2097 dsl_dataset_zero_zil(ds, tx); 2098 2099 dsl_destroy_head_sync_impl(clone, tx); 2100 2101 dsl_dataset_rele(clone, FTAG); 2102 dsl_dataset_rele(ds, FTAG); 2103} 2104 2105/* 2106 * Rolls back the given filesystem or volume to the most recent snapshot. 2107 * The name of the most recent snapshot will be returned under key "target" 2108 * in the result nvlist. 2109 * 2110 * If owner != NULL: 2111 * - The existing dataset MUST be owned by the specified owner at entry 2112 * - Upon return, dataset will still be held by the same owner, whether we 2113 * succeed or not. 2114 * 2115 * This mode is required any time the existing filesystem is mounted. See 2116 * notes above zfs_suspend_fs() for further details. 2117 */ 2118int 2119dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2120{ 2121 dsl_dataset_rollback_arg_t ddra; 2122 2123 ddra.ddra_fsname = fsname; 2124 ddra.ddra_owner = owner; 2125 ddra.ddra_result = result; 2126 2127 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2128 dsl_dataset_rollback_sync, &ddra, 2129 1, ZFS_SPACE_CHECK_RESERVED)); 2130} 2131 2132struct promotenode { 2133 list_node_t link; 2134 dsl_dataset_t *ds; 2135}; 2136 2137typedef struct dsl_dataset_promote_arg { 2138 const char *ddpa_clonename; 2139 dsl_dataset_t *ddpa_clone; 2140 list_t shared_snaps, origin_snaps, clone_snaps; 2141 dsl_dataset_t *origin_origin; /* origin of the origin */ 2142 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2143 char *err_ds; 2144 cred_t *cr; 2145} dsl_dataset_promote_arg_t; 2146 2147static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2148static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2149 void *tag); 2150static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2151 2152static int 2153dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2154{ 2155 dsl_dataset_promote_arg_t *ddpa = arg; 2156 dsl_pool_t *dp = dmu_tx_pool(tx); 2157 dsl_dataset_t *hds; 2158 struct promotenode *snap; 2159 dsl_dataset_t *origin_ds; 2160 int err; 2161 uint64_t unused; 2162 uint64_t ss_mv_cnt; 2163 2164 err = promote_hold(ddpa, dp, FTAG); 2165 if (err != 0) 2166 return (err); 2167 2168 hds = ddpa->ddpa_clone; 2169 2170 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2171 promote_rele(ddpa, FTAG); 2172 return (SET_ERROR(EXDEV)); 2173 } 2174 2175 /* 2176 * Compute and check the amount of space to transfer. Since this is 2177 * so expensive, don't do the preliminary check. 2178 */ 2179 if (!dmu_tx_is_syncing(tx)) { 2180 promote_rele(ddpa, FTAG); 2181 return (0); 2182 } 2183 2184 snap = list_head(&ddpa->shared_snaps); 2185 origin_ds = snap->ds; 2186 2187 /* compute origin's new unique space */ 2188 snap = list_tail(&ddpa->clone_snaps); 2189 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2190 origin_ds->ds_object); 2191 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2192 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2193 &ddpa->unique, &unused, &unused); 2194 2195 /* 2196 * Walk the snapshots that we are moving 2197 * 2198 * Compute space to transfer. Consider the incremental changes 2199 * to used by each snapshot: 2200 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2201 * So each snapshot gave birth to: 2202 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2203 * So a sequence would look like: 2204 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2205 * Which simplifies to: 2206 * uN + kN + kN-1 + ... + k1 + k0 2207 * Note however, if we stop before we reach the ORIGIN we get: 2208 * uN + kN + kN-1 + ... + kM - uM-1 2209 */ 2210 ss_mv_cnt = 0; 2211 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2212 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2213 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2214 for (snap = list_head(&ddpa->shared_snaps); snap; 2215 snap = list_next(&ddpa->shared_snaps, snap)) { 2216 uint64_t val, dlused, dlcomp, dluncomp; 2217 dsl_dataset_t *ds = snap->ds; 2218 2219 ss_mv_cnt++; 2220 2221 /* 2222 * If there are long holds, we won't be able to evict 2223 * the objset. 2224 */ 2225 if (dsl_dataset_long_held(ds)) { 2226 err = SET_ERROR(EBUSY); 2227 goto out; 2228 } 2229 2230 /* Check that the snapshot name does not conflict */ 2231 VERIFY0(dsl_dataset_get_snapname(ds)); 2232 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2233 if (err == 0) { 2234 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2235 err = SET_ERROR(EEXIST); 2236 goto out; 2237 } 2238 if (err != ENOENT) 2239 goto out; 2240 2241 /* The very first snapshot does not have a deadlist */ 2242 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2243 continue; 2244 2245 dsl_deadlist_space(&ds->ds_deadlist, 2246 &dlused, &dlcomp, &dluncomp); 2247 ddpa->used += dlused; 2248 ddpa->comp += dlcomp; 2249 ddpa->uncomp += dluncomp; 2250 } 2251 2252 /* 2253 * If we are a clone of a clone then we never reached ORIGIN, 2254 * so we need to subtract out the clone origin's used space. 2255 */ 2256 if (ddpa->origin_origin) { 2257 ddpa->used -= 2258 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2259 ddpa->comp -= 2260 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2261 ddpa->uncomp -= 2262 dsl_dataset_phys(ddpa->origin_origin)-> 2263 ds_uncompressed_bytes; 2264 } 2265 2266 /* Check that there is enough space and limit headroom here */ 2267 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2268 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2269 if (err != 0) 2270 goto out; 2271 2272 /* 2273 * Compute the amounts of space that will be used by snapshots 2274 * after the promotion (for both origin and clone). For each, 2275 * it is the amount of space that will be on all of their 2276 * deadlists (that was not born before their new origin). 2277 */ 2278 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2279 uint64_t space; 2280 2281 /* 2282 * Note, typically this will not be a clone of a clone, 2283 * so dd_origin_txg will be < TXG_INITIAL, so 2284 * these snaplist_space() -> dsl_deadlist_space_range() 2285 * calls will be fast because they do not have to 2286 * iterate over all bps. 2287 */ 2288 snap = list_head(&ddpa->origin_snaps); 2289 err = snaplist_space(&ddpa->shared_snaps, 2290 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2291 if (err != 0) 2292 goto out; 2293 2294 err = snaplist_space(&ddpa->clone_snaps, 2295 snap->ds->ds_dir->dd_origin_txg, &space); 2296 if (err != 0) 2297 goto out; 2298 ddpa->cloneusedsnap += space; 2299 } 2300 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2301 DD_FLAG_USED_BREAKDOWN) { 2302 err = snaplist_space(&ddpa->origin_snaps, 2303 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2304 &ddpa->originusedsnap); 2305 if (err != 0) 2306 goto out; 2307 } 2308 2309out: 2310 promote_rele(ddpa, FTAG); 2311 return (err); 2312} 2313 2314static void 2315dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2316{ 2317 dsl_dataset_promote_arg_t *ddpa = arg; 2318 dsl_pool_t *dp = dmu_tx_pool(tx); 2319 dsl_dataset_t *hds; 2320 struct promotenode *snap; 2321 dsl_dataset_t *origin_ds; 2322 dsl_dataset_t *origin_head; 2323 dsl_dir_t *dd; 2324 dsl_dir_t *odd = NULL; 2325 uint64_t oldnext_obj; 2326 int64_t delta; 2327#if defined(__FreeBSD__) && defined(_KERNEL) 2328 char *oldname, *newname; 2329#endif 2330 2331 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2332 hds = ddpa->ddpa_clone; 2333 2334 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2335 2336 snap = list_head(&ddpa->shared_snaps); 2337 origin_ds = snap->ds; 2338 dd = hds->ds_dir; 2339 2340 snap = list_head(&ddpa->origin_snaps); 2341 origin_head = snap->ds; 2342 2343 /* 2344 * We need to explicitly open odd, since origin_ds's dd will be 2345 * changing. 2346 */ 2347 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2348 NULL, FTAG, &odd)); 2349 2350 /* change origin's next snap */ 2351 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2352 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2353 snap = list_tail(&ddpa->clone_snaps); 2354 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2355 origin_ds->ds_object); 2356 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2357 2358 /* change the origin's next clone */ 2359 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2360 dsl_dataset_remove_from_next_clones(origin_ds, 2361 snap->ds->ds_object, tx); 2362 VERIFY0(zap_add_int(dp->dp_meta_objset, 2363 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2364 oldnext_obj, tx)); 2365 } 2366 2367 /* change origin */ 2368 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2369 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2370 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2371 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2372 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2373 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2374 origin_head->ds_dir->dd_origin_txg = 2375 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2376 2377 /* change dd_clone entries */ 2378 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2379 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2380 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2381 VERIFY0(zap_add_int(dp->dp_meta_objset, 2382 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2383 hds->ds_object, tx)); 2384 2385 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2386 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2387 origin_head->ds_object, tx)); 2388 if (dsl_dir_phys(dd)->dd_clones == 0) { 2389 dsl_dir_phys(dd)->dd_clones = 2390 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2391 DMU_OT_NONE, 0, tx); 2392 } 2393 VERIFY0(zap_add_int(dp->dp_meta_objset, 2394 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2395 } 2396 2397#if defined(__FreeBSD__) && defined(_KERNEL) 2398 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2399 mutex_enter(&spa_namespace_lock); 2400 2401 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2402 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2403#endif 2404 2405 /* move snapshots to this dir */ 2406 for (snap = list_head(&ddpa->shared_snaps); snap; 2407 snap = list_next(&ddpa->shared_snaps, snap)) { 2408 dsl_dataset_t *ds = snap->ds; 2409 2410 /* 2411 * Property callbacks are registered to a particular 2412 * dsl_dir. Since ours is changing, evict the objset 2413 * so that they will be unregistered from the old dsl_dir. 2414 */ 2415 if (ds->ds_objset) { 2416 dmu_objset_evict(ds->ds_objset); 2417 ds->ds_objset = NULL; 2418 } 2419 2420 /* move snap name entry */ 2421 VERIFY0(dsl_dataset_get_snapname(ds)); 2422 VERIFY0(dsl_dataset_snap_remove(origin_head, 2423 ds->ds_snapname, tx, B_TRUE)); 2424 VERIFY0(zap_add(dp->dp_meta_objset, 2425 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2426 8, 1, &ds->ds_object, tx)); 2427 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2428 DD_FIELD_SNAPSHOT_COUNT, tx); 2429 2430 /* change containing dsl_dir */ 2431 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2432 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2433 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2434 ASSERT3P(ds->ds_dir, ==, odd); 2435 dsl_dir_rele(ds->ds_dir, ds); 2436 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2437 NULL, ds, &ds->ds_dir)); 2438 2439#if defined(__FreeBSD__) && defined(_KERNEL) 2440 dsl_dataset_name(ds, newname); 2441 zfsvfs_update_fromname(oldname, newname); 2442 zvol_rename_minors(oldname, newname); 2443#endif 2444 2445 /* move any clone references */ 2446 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2447 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2448 zap_cursor_t zc; 2449 zap_attribute_t za; 2450 2451 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2452 dsl_dataset_phys(ds)->ds_next_clones_obj); 2453 zap_cursor_retrieve(&zc, &za) == 0; 2454 zap_cursor_advance(&zc)) { 2455 dsl_dataset_t *cnds; 2456 uint64_t o; 2457 2458 if (za.za_first_integer == oldnext_obj) { 2459 /* 2460 * We've already moved the 2461 * origin's reference. 2462 */ 2463 continue; 2464 } 2465 2466 VERIFY0(dsl_dataset_hold_obj(dp, 2467 za.za_first_integer, FTAG, &cnds)); 2468 o = dsl_dir_phys(cnds->ds_dir)-> 2469 dd_head_dataset_obj; 2470 2471 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2472 dsl_dir_phys(odd)->dd_clones, o, tx)); 2473 VERIFY0(zap_add_int(dp->dp_meta_objset, 2474 dsl_dir_phys(dd)->dd_clones, o, tx)); 2475 dsl_dataset_rele(cnds, FTAG); 2476 } 2477 zap_cursor_fini(&zc); 2478 } 2479 2480 ASSERT(!dsl_prop_hascb(ds)); 2481 } 2482 2483#if defined(__FreeBSD__) && defined(_KERNEL) 2484 mutex_exit(&spa_namespace_lock); 2485 2486 kmem_free(newname, MAXPATHLEN); 2487 kmem_free(oldname, MAXPATHLEN); 2488#endif 2489 /* 2490 * Change space accounting. 2491 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2492 * both be valid, or both be 0 (resulting in delta == 0). This 2493 * is true for each of {clone,origin} independently. 2494 */ 2495 2496 delta = ddpa->cloneusedsnap - 2497 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2498 ASSERT3S(delta, >=, 0); 2499 ASSERT3U(ddpa->used, >=, delta); 2500 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2501 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2502 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2503 2504 delta = ddpa->originusedsnap - 2505 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2506 ASSERT3S(delta, <=, 0); 2507 ASSERT3U(ddpa->used, >=, -delta); 2508 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2509 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2510 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2511 2512 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2513 2514 /* log history record */ 2515 spa_history_log_internal_ds(hds, "promote", tx, ""); 2516 2517 dsl_dir_rele(odd, FTAG); 2518 promote_rele(ddpa, FTAG); 2519} 2520 2521/* 2522 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2523 * (exclusive) and last_obj (inclusive). The list will be in reverse 2524 * order (last_obj will be the list_head()). If first_obj == 0, do all 2525 * snapshots back to this dataset's origin. 2526 */ 2527static int 2528snaplist_make(dsl_pool_t *dp, 2529 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2530{ 2531 uint64_t obj = last_obj; 2532 2533 list_create(l, sizeof (struct promotenode), 2534 offsetof(struct promotenode, link)); 2535 2536 while (obj != first_obj) { 2537 dsl_dataset_t *ds; 2538 struct promotenode *snap; 2539 int err; 2540 2541 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2542 ASSERT(err != ENOENT); 2543 if (err != 0) 2544 return (err); 2545 2546 if (first_obj == 0) 2547 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2548 2549 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2550 snap->ds = ds; 2551 list_insert_tail(l, snap); 2552 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2553 } 2554 2555 return (0); 2556} 2557 2558static int 2559snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2560{ 2561 struct promotenode *snap; 2562 2563 *spacep = 0; 2564 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2565 uint64_t used, comp, uncomp; 2566 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2567 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2568 *spacep += used; 2569 } 2570 return (0); 2571} 2572 2573static void 2574snaplist_destroy(list_t *l, void *tag) 2575{ 2576 struct promotenode *snap; 2577 2578 if (l == NULL || !list_link_active(&l->list_head)) 2579 return; 2580 2581 while ((snap = list_tail(l)) != NULL) { 2582 list_remove(l, snap); 2583 dsl_dataset_rele(snap->ds, tag); 2584 kmem_free(snap, sizeof (*snap)); 2585 } 2586 list_destroy(l); 2587} 2588 2589static int 2590promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2591{ 2592 int error; 2593 dsl_dir_t *dd; 2594 struct promotenode *snap; 2595 2596 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2597 &ddpa->ddpa_clone); 2598 if (error != 0) 2599 return (error); 2600 dd = ddpa->ddpa_clone->ds_dir; 2601 2602 if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) || 2603 !dsl_dir_is_clone(dd)) { 2604 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2605 return (SET_ERROR(EINVAL)); 2606 } 2607 2608 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2609 &ddpa->shared_snaps, tag); 2610 if (error != 0) 2611 goto out; 2612 2613 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2614 &ddpa->clone_snaps, tag); 2615 if (error != 0) 2616 goto out; 2617 2618 snap = list_head(&ddpa->shared_snaps); 2619 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2620 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2621 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2622 &ddpa->origin_snaps, tag); 2623 if (error != 0) 2624 goto out; 2625 2626 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2627 error = dsl_dataset_hold_obj(dp, 2628 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2629 tag, &ddpa->origin_origin); 2630 if (error != 0) 2631 goto out; 2632 } 2633out: 2634 if (error != 0) 2635 promote_rele(ddpa, tag); 2636 return (error); 2637} 2638 2639static void 2640promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2641{ 2642 snaplist_destroy(&ddpa->shared_snaps, tag); 2643 snaplist_destroy(&ddpa->clone_snaps, tag); 2644 snaplist_destroy(&ddpa->origin_snaps, tag); 2645 if (ddpa->origin_origin != NULL) 2646 dsl_dataset_rele(ddpa->origin_origin, tag); 2647 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2648} 2649 2650/* 2651 * Promote a clone. 2652 * 2653 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2654 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2655 */ 2656int 2657dsl_dataset_promote(const char *name, char *conflsnap) 2658{ 2659 dsl_dataset_promote_arg_t ddpa = { 0 }; 2660 uint64_t numsnaps; 2661 int error; 2662 objset_t *os; 2663 2664 /* 2665 * We will modify space proportional to the number of 2666 * snapshots. Compute numsnaps. 2667 */ 2668 error = dmu_objset_hold(name, FTAG, &os); 2669 if (error != 0) 2670 return (error); 2671 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2672 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2673 &numsnaps); 2674 dmu_objset_rele(os, FTAG); 2675 if (error != 0) 2676 return (error); 2677 2678 ddpa.ddpa_clonename = name; 2679 ddpa.err_ds = conflsnap; 2680 ddpa.cr = CRED(); 2681 2682 return (dsl_sync_task(name, dsl_dataset_promote_check, 2683 dsl_dataset_promote_sync, &ddpa, 2684 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2685} 2686 2687int 2688dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2689 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2690{ 2691 int64_t unused_refres_delta; 2692 2693 /* they should both be heads */ 2694 if (dsl_dataset_is_snapshot(clone) || 2695 dsl_dataset_is_snapshot(origin_head)) 2696 return (SET_ERROR(EINVAL)); 2697 2698 /* if we are not forcing, the branch point should be just before them */ 2699 if (!force && clone->ds_prev != origin_head->ds_prev) 2700 return (SET_ERROR(EINVAL)); 2701 2702 /* clone should be the clone (unless they are unrelated) */ 2703 if (clone->ds_prev != NULL && 2704 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2705 origin_head->ds_dir != clone->ds_prev->ds_dir) 2706 return (SET_ERROR(EINVAL)); 2707 2708 /* the clone should be a child of the origin */ 2709 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2710 return (SET_ERROR(EINVAL)); 2711 2712 /* origin_head shouldn't be modified unless 'force' */ 2713 if (!force && 2714 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2715 return (SET_ERROR(ETXTBSY)); 2716 2717 /* origin_head should have no long holds (e.g. is not mounted) */ 2718 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2719 return (SET_ERROR(EBUSY)); 2720 2721 /* check amount of any unconsumed refreservation */ 2722 unused_refres_delta = 2723 (int64_t)MIN(origin_head->ds_reserved, 2724 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2725 (int64_t)MIN(origin_head->ds_reserved, 2726 dsl_dataset_phys(clone)->ds_unique_bytes); 2727 2728 if (unused_refres_delta > 0 && 2729 unused_refres_delta > 2730 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2731 return (SET_ERROR(ENOSPC)); 2732 2733 /* clone can't be over the head's refquota */ 2734 if (origin_head->ds_quota != 0 && 2735 dsl_dataset_phys(clone)->ds_referenced_bytes > 2736 origin_head->ds_quota) 2737 return (SET_ERROR(EDQUOT)); 2738 2739 return (0); 2740} 2741 2742void 2743dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2744 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2745{ 2746 dsl_pool_t *dp = dmu_tx_pool(tx); 2747 int64_t unused_refres_delta; 2748 2749 ASSERT(clone->ds_reserved == 0); 2750 ASSERT(origin_head->ds_quota == 0 || 2751 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); 2752 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2753 2754 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2755 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2756 2757 if (clone->ds_objset != NULL) { 2758 dmu_objset_evict(clone->ds_objset); 2759 clone->ds_objset = NULL; 2760 } 2761 2762 if (origin_head->ds_objset != NULL) { 2763 dmu_objset_evict(origin_head->ds_objset); 2764 origin_head->ds_objset = NULL; 2765 } 2766 2767 unused_refres_delta = 2768 (int64_t)MIN(origin_head->ds_reserved, 2769 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2770 (int64_t)MIN(origin_head->ds_reserved, 2771 dsl_dataset_phys(clone)->ds_unique_bytes); 2772 2773 /* 2774 * Reset origin's unique bytes, if it exists. 2775 */ 2776 if (clone->ds_prev) { 2777 dsl_dataset_t *origin = clone->ds_prev; 2778 uint64_t comp, uncomp; 2779 2780 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2781 dsl_deadlist_space_range(&clone->ds_deadlist, 2782 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 2783 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 2784 } 2785 2786 /* swap blkptrs */ 2787 { 2788 blkptr_t tmp; 2789 tmp = dsl_dataset_phys(origin_head)->ds_bp; 2790 dsl_dataset_phys(origin_head)->ds_bp = 2791 dsl_dataset_phys(clone)->ds_bp; 2792 dsl_dataset_phys(clone)->ds_bp = tmp; 2793 } 2794 2795 /* set dd_*_bytes */ 2796 { 2797 int64_t dused, dcomp, duncomp; 2798 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2799 uint64_t odl_used, odl_comp, odl_uncomp; 2800 2801 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 2802 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2803 2804 dsl_deadlist_space(&clone->ds_deadlist, 2805 &cdl_used, &cdl_comp, &cdl_uncomp); 2806 dsl_deadlist_space(&origin_head->ds_deadlist, 2807 &odl_used, &odl_comp, &odl_uncomp); 2808 2809 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 2810 cdl_used - 2811 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 2812 odl_used); 2813 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 2814 cdl_comp - 2815 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 2816 odl_comp); 2817 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 2818 cdl_uncomp - 2819 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 2820 odl_uncomp); 2821 2822 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2823 dused, dcomp, duncomp, tx); 2824 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2825 -dused, -dcomp, -duncomp, tx); 2826 2827 /* 2828 * The difference in the space used by snapshots is the 2829 * difference in snapshot space due to the head's 2830 * deadlist (since that's the only thing that's 2831 * changing that affects the snapused). 2832 */ 2833 dsl_deadlist_space_range(&clone->ds_deadlist, 2834 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2835 &cdl_used, &cdl_comp, &cdl_uncomp); 2836 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2837 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2838 &odl_used, &odl_comp, &odl_uncomp); 2839 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2840 DD_USED_HEAD, DD_USED_SNAP, tx); 2841 } 2842 2843 /* swap ds_*_bytes */ 2844 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 2845 dsl_dataset_phys(clone)->ds_referenced_bytes); 2846 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 2847 dsl_dataset_phys(clone)->ds_compressed_bytes); 2848 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 2849 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 2850 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 2851 dsl_dataset_phys(clone)->ds_unique_bytes); 2852 2853 /* apply any parent delta for change in unconsumed refreservation */ 2854 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 2855 unused_refres_delta, 0, 0, tx); 2856 2857 /* 2858 * Swap deadlists. 2859 */ 2860 dsl_deadlist_close(&clone->ds_deadlist); 2861 dsl_deadlist_close(&origin_head->ds_deadlist); 2862 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 2863 dsl_dataset_phys(clone)->ds_deadlist_obj); 2864 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 2865 dsl_dataset_phys(clone)->ds_deadlist_obj); 2866 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 2867 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 2868 2869 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 2870 2871 spa_history_log_internal_ds(clone, "clone swap", tx, 2872 "parent=%s", origin_head->ds_dir->dd_myname); 2873} 2874 2875/* 2876 * Given a pool name and a dataset object number in that pool, 2877 * return the name of that dataset. 2878 */ 2879int 2880dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2881{ 2882 dsl_pool_t *dp; 2883 dsl_dataset_t *ds; 2884 int error; 2885 2886 error = dsl_pool_hold(pname, FTAG, &dp); 2887 if (error != 0) 2888 return (error); 2889 2890 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 2891 if (error == 0) { 2892 dsl_dataset_name(ds, buf); 2893 dsl_dataset_rele(ds, FTAG); 2894 } 2895 dsl_pool_rele(dp, FTAG); 2896 2897 return (error); 2898} 2899 2900int 2901dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2902 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2903{ 2904 int error = 0; 2905 2906 ASSERT3S(asize, >, 0); 2907 2908 /* 2909 * *ref_rsrv is the portion of asize that will come from any 2910 * unconsumed refreservation space. 2911 */ 2912 *ref_rsrv = 0; 2913 2914 mutex_enter(&ds->ds_lock); 2915 /* 2916 * Make a space adjustment for reserved bytes. 2917 */ 2918 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2919 ASSERT3U(*used, >=, 2920 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 2921 *used -= 2922 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 2923 *ref_rsrv = 2924 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2925 } 2926 2927 if (!check_quota || ds->ds_quota == 0) { 2928 mutex_exit(&ds->ds_lock); 2929 return (0); 2930 } 2931 /* 2932 * If they are requesting more space, and our current estimate 2933 * is over quota, they get to try again unless the actual 2934 * on-disk is over quota and there are no pending changes (which 2935 * may free up space for us). 2936 */ 2937 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 2938 ds->ds_quota) { 2939 if (inflight > 0 || 2940 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 2941 error = SET_ERROR(ERESTART); 2942 else 2943 error = SET_ERROR(EDQUOT); 2944 } 2945 mutex_exit(&ds->ds_lock); 2946 2947 return (error); 2948} 2949 2950typedef struct dsl_dataset_set_qr_arg { 2951 const char *ddsqra_name; 2952 zprop_source_t ddsqra_source; 2953 uint64_t ddsqra_value; 2954} dsl_dataset_set_qr_arg_t; 2955 2956 2957/* ARGSUSED */ 2958static int 2959dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 2960{ 2961 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2962 dsl_pool_t *dp = dmu_tx_pool(tx); 2963 dsl_dataset_t *ds; 2964 int error; 2965 uint64_t newval; 2966 2967 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 2968 return (SET_ERROR(ENOTSUP)); 2969 2970 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2971 if (error != 0) 2972 return (error); 2973 2974 if (dsl_dataset_is_snapshot(ds)) { 2975 dsl_dataset_rele(ds, FTAG); 2976 return (SET_ERROR(EINVAL)); 2977 } 2978 2979 error = dsl_prop_predict(ds->ds_dir, 2980 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2981 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2982 if (error != 0) { 2983 dsl_dataset_rele(ds, FTAG); 2984 return (error); 2985 } 2986 2987 if (newval == 0) { 2988 dsl_dataset_rele(ds, FTAG); 2989 return (0); 2990 } 2991 2992 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 2993 newval < ds->ds_reserved) { 2994 dsl_dataset_rele(ds, FTAG); 2995 return (SET_ERROR(ENOSPC)); 2996 } 2997 2998 dsl_dataset_rele(ds, FTAG); 2999 return (0); 3000} 3001 3002static void 3003dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3004{ 3005 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3006 dsl_pool_t *dp = dmu_tx_pool(tx); 3007 dsl_dataset_t *ds; 3008 uint64_t newval; 3009 3010 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3011 3012 dsl_prop_set_sync_impl(ds, 3013 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3014 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3015 &ddsqra->ddsqra_value, tx); 3016 3017 VERIFY0(dsl_prop_get_int_ds(ds, 3018 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3019 3020 if (ds->ds_quota != newval) { 3021 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3022 ds->ds_quota = newval; 3023 } 3024 dsl_dataset_rele(ds, FTAG); 3025} 3026 3027int 3028dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3029 uint64_t refquota) 3030{ 3031 dsl_dataset_set_qr_arg_t ddsqra; 3032 3033 ddsqra.ddsqra_name = dsname; 3034 ddsqra.ddsqra_source = source; 3035 ddsqra.ddsqra_value = refquota; 3036 3037 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3038 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3039} 3040 3041static int 3042dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3043{ 3044 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3045 dsl_pool_t *dp = dmu_tx_pool(tx); 3046 dsl_dataset_t *ds; 3047 int error; 3048 uint64_t newval, unique; 3049 3050 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3051 return (SET_ERROR(ENOTSUP)); 3052 3053 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3054 if (error != 0) 3055 return (error); 3056 3057 if (dsl_dataset_is_snapshot(ds)) { 3058 dsl_dataset_rele(ds, FTAG); 3059 return (SET_ERROR(EINVAL)); 3060 } 3061 3062 error = dsl_prop_predict(ds->ds_dir, 3063 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3064 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3065 if (error != 0) { 3066 dsl_dataset_rele(ds, FTAG); 3067 return (error); 3068 } 3069 3070 /* 3071 * If we are doing the preliminary check in open context, the 3072 * space estimates may be inaccurate. 3073 */ 3074 if (!dmu_tx_is_syncing(tx)) { 3075 dsl_dataset_rele(ds, FTAG); 3076 return (0); 3077 } 3078 3079 mutex_enter(&ds->ds_lock); 3080 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3081 dsl_dataset_recalc_head_uniq(ds); 3082 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3083 mutex_exit(&ds->ds_lock); 3084 3085 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3086 uint64_t delta = MAX(unique, newval) - 3087 MAX(unique, ds->ds_reserved); 3088 3089 if (delta > 3090 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3091 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3092 dsl_dataset_rele(ds, FTAG); 3093 return (SET_ERROR(ENOSPC)); 3094 } 3095 } 3096 3097 dsl_dataset_rele(ds, FTAG); 3098 return (0); 3099} 3100 3101void 3102dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3103 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3104{ 3105 uint64_t newval; 3106 uint64_t unique; 3107 int64_t delta; 3108 3109 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3110 source, sizeof (value), 1, &value, tx); 3111 3112 VERIFY0(dsl_prop_get_int_ds(ds, 3113 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3114 3115 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3116 mutex_enter(&ds->ds_dir->dd_lock); 3117 mutex_enter(&ds->ds_lock); 3118 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3119 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3120 delta = MAX(0, (int64_t)(newval - unique)) - 3121 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3122 ds->ds_reserved = newval; 3123 mutex_exit(&ds->ds_lock); 3124 3125 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3126 mutex_exit(&ds->ds_dir->dd_lock); 3127} 3128 3129static void 3130dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3131{ 3132 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3133 dsl_pool_t *dp = dmu_tx_pool(tx); 3134 dsl_dataset_t *ds; 3135 3136 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3137 dsl_dataset_set_refreservation_sync_impl(ds, 3138 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3139 dsl_dataset_rele(ds, FTAG); 3140} 3141 3142int 3143dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3144 uint64_t refreservation) 3145{ 3146 dsl_dataset_set_qr_arg_t ddsqra; 3147 3148 ddsqra.ddsqra_name = dsname; 3149 ddsqra.ddsqra_source = source; 3150 ddsqra.ddsqra_value = refreservation; 3151 3152 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3153 dsl_dataset_set_refreservation_sync, &ddsqra, 3154 0, ZFS_SPACE_CHECK_NONE)); 3155} 3156 3157/* 3158 * Return (in *usedp) the amount of space written in new that is not 3159 * present in oldsnap. New may be a snapshot or the head. Old must be 3160 * a snapshot before new, in new's filesystem (or its origin). If not then 3161 * fail and return EINVAL. 3162 * 3163 * The written space is calculated by considering two components: First, we 3164 * ignore any freed space, and calculate the written as new's used space 3165 * minus old's used space. Next, we add in the amount of space that was freed 3166 * between the two snapshots, thus reducing new's used space relative to old's. 3167 * Specifically, this is the space that was born before old->ds_creation_txg, 3168 * and freed before new (ie. on new's deadlist or a previous deadlist). 3169 * 3170 * space freed [---------------------] 3171 * snapshots ---O-------O--------O-------O------ 3172 * oldsnap new 3173 */ 3174int 3175dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3176 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3177{ 3178 int err = 0; 3179 uint64_t snapobj; 3180 dsl_pool_t *dp = new->ds_dir->dd_pool; 3181 3182 ASSERT(dsl_pool_config_held(dp)); 3183 3184 *usedp = 0; 3185 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3186 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3187 3188 *compp = 0; 3189 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3190 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3191 3192 *uncompp = 0; 3193 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3194 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3195 3196 snapobj = new->ds_object; 3197 while (snapobj != oldsnap->ds_object) { 3198 dsl_dataset_t *snap; 3199 uint64_t used, comp, uncomp; 3200 3201 if (snapobj == new->ds_object) { 3202 snap = new; 3203 } else { 3204 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3205 if (err != 0) 3206 break; 3207 } 3208 3209 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3210 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3211 /* 3212 * The blocks in the deadlist can not be born after 3213 * ds_prev_snap_txg, so get the whole deadlist space, 3214 * which is more efficient (especially for old-format 3215 * deadlists). Unfortunately the deadlist code 3216 * doesn't have enough information to make this 3217 * optimization itself. 3218 */ 3219 dsl_deadlist_space(&snap->ds_deadlist, 3220 &used, &comp, &uncomp); 3221 } else { 3222 dsl_deadlist_space_range(&snap->ds_deadlist, 3223 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3224 &used, &comp, &uncomp); 3225 } 3226 *usedp += used; 3227 *compp += comp; 3228 *uncompp += uncomp; 3229 3230 /* 3231 * If we get to the beginning of the chain of snapshots 3232 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3233 * was not a snapshot of/before new. 3234 */ 3235 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3236 if (snap != new) 3237 dsl_dataset_rele(snap, FTAG); 3238 if (snapobj == 0) { 3239 err = SET_ERROR(EINVAL); 3240 break; 3241 } 3242 3243 } 3244 return (err); 3245} 3246 3247/* 3248 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3249 * lastsnap, and all snapshots in between are deleted. 3250 * 3251 * blocks that would be freed [---------------------------] 3252 * snapshots ---O-------O--------O-------O--------O 3253 * firstsnap lastsnap 3254 * 3255 * This is the set of blocks that were born after the snap before firstsnap, 3256 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3257 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3258 * We calculate this by iterating over the relevant deadlists (from the snap 3259 * after lastsnap, backward to the snap after firstsnap), summing up the 3260 * space on the deadlist that was born after the snap before firstsnap. 3261 */ 3262int 3263dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3264 dsl_dataset_t *lastsnap, 3265 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3266{ 3267 int err = 0; 3268 uint64_t snapobj; 3269 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3270 3271 ASSERT(dsl_dataset_is_snapshot(firstsnap)); 3272 ASSERT(dsl_dataset_is_snapshot(lastsnap)); 3273 3274 /* 3275 * Check that the snapshots are in the same dsl_dir, and firstsnap 3276 * is before lastsnap. 3277 */ 3278 if (firstsnap->ds_dir != lastsnap->ds_dir || 3279 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3280 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3281 return (SET_ERROR(EINVAL)); 3282 3283 *usedp = *compp = *uncompp = 0; 3284 3285 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3286 while (snapobj != firstsnap->ds_object) { 3287 dsl_dataset_t *ds; 3288 uint64_t used, comp, uncomp; 3289 3290 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3291 if (err != 0) 3292 break; 3293 3294 dsl_deadlist_space_range(&ds->ds_deadlist, 3295 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3296 &used, &comp, &uncomp); 3297 *usedp += used; 3298 *compp += comp; 3299 *uncompp += uncomp; 3300 3301 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3302 ASSERT3U(snapobj, !=, 0); 3303 dsl_dataset_rele(ds, FTAG); 3304 } 3305 return (err); 3306} 3307 3308static int 3309dsl_dataset_activate_large_blocks_check(void *arg, dmu_tx_t *tx) 3310{ 3311 const char *dsname = arg; 3312 dsl_dataset_t *ds; 3313 dsl_pool_t *dp = dmu_tx_pool(tx); 3314 int error = 0; 3315 3316 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS)) 3317 return (SET_ERROR(ENOTSUP)); 3318 3319 ASSERT(spa_feature_is_enabled(dp->dp_spa, 3320 SPA_FEATURE_EXTENSIBLE_DATASET)); 3321 3322 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 3323 if (error != 0) 3324 return (error); 3325 3326 if (ds->ds_large_blocks) 3327 error = EALREADY; 3328 dsl_dataset_rele(ds, FTAG); 3329 3330 return (error); 3331} 3332 3333void 3334dsl_dataset_activate_large_blocks_sync_impl(uint64_t dsobj, dmu_tx_t *tx) 3335{ 3336 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 3337 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 3338 uint64_t zero = 0; 3339 3340 spa_feature_incr(spa, SPA_FEATURE_LARGE_BLOCKS, tx); 3341 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 3342 3343 VERIFY0(zap_add(mos, dsobj, DS_FIELD_LARGE_BLOCKS, 3344 sizeof (zero), 1, &zero, tx)); 3345} 3346 3347static void 3348dsl_dataset_activate_large_blocks_sync(void *arg, dmu_tx_t *tx) 3349{ 3350 const char *dsname = arg; 3351 dsl_dataset_t *ds; 3352 3353 VERIFY0(dsl_dataset_hold(dmu_tx_pool(tx), dsname, FTAG, &ds)); 3354 3355 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); 3356 ASSERT(!ds->ds_large_blocks); 3357 ds->ds_large_blocks = B_TRUE; 3358 dsl_dataset_rele(ds, FTAG); 3359} 3360 3361int 3362dsl_dataset_activate_large_blocks(const char *dsname) 3363{ 3364 int error; 3365 3366 error = dsl_sync_task(dsname, 3367 dsl_dataset_activate_large_blocks_check, 3368 dsl_dataset_activate_large_blocks_sync, (void *)dsname, 3369 1, ZFS_SPACE_CHECK_RESERVED); 3370 3371 /* 3372 * EALREADY indicates that this dataset already supports large blocks. 3373 */ 3374 if (error == EALREADY) 3375 error = 0; 3376 return (error); 3377} 3378 3379/* 3380 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3381 * For example, they could both be snapshots of the same filesystem, and 3382 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3383 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3384 * filesystem. Or 'earlier' could be the origin's origin. 3385 * 3386 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3387 */ 3388boolean_t 3389dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3390 uint64_t earlier_txg) 3391{ 3392 dsl_pool_t *dp = later->ds_dir->dd_pool; 3393 int error; 3394 boolean_t ret; 3395 3396 ASSERT(dsl_pool_config_held(dp)); 3397 ASSERT(dsl_dataset_is_snapshot(earlier) || earlier_txg != 0); 3398 3399 if (earlier_txg == 0) 3400 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3401 3402 if (dsl_dataset_is_snapshot(later) && 3403 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3404 return (B_FALSE); 3405 3406 if (later->ds_dir == earlier->ds_dir) 3407 return (B_TRUE); 3408 if (!dsl_dir_is_clone(later->ds_dir)) 3409 return (B_FALSE); 3410 3411 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3412 return (B_TRUE); 3413 dsl_dataset_t *origin; 3414 error = dsl_dataset_hold_obj(dp, 3415 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3416 if (error != 0) 3417 return (B_FALSE); 3418 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3419 dsl_dataset_rele(origin, FTAG); 3420 return (ret); 3421} 3422 3423 3424void 3425dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3426{ 3427 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3428 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3429} 3430