dsl_dataset.c revision 282755
1279315Strasz/* 2279315Strasz * CDDL HEADER START 3279315Strasz * 4279315Strasz * The contents of this file are subject to the terms of the 5279315Strasz * Common Development and Distribution License (the "License"). 6279315Strasz * You may not use this file except in compliance with the License. 7279323Strasz * 8279315Strasz * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9279315Strasz * or http://www.opensolaris.org/os/licensing. 10279315Strasz * See the License for the specific language governing permissions 11279315Strasz * 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, NULL); 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, NULL); 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, 417 DS_FIELD_LARGE_BLOCKS); 418 if (zaperr != ENOENT) { 419 VERIFY0(zaperr); 420 ds->ds_large_blocks = B_TRUE; 421 } 422 } 423 424 if (err == 0) { 425 err = dsl_dir_hold_obj(dp, 426 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, 427 &ds->ds_dir); 428 } 429 if (err != 0) { 430 mutex_destroy(&ds->ds_lock); 431 mutex_destroy(&ds->ds_opening_lock); 432 mutex_destroy(&ds->ds_sendstream_lock); 433 refcount_destroy(&ds->ds_longholds); 434 bplist_destroy(&ds->ds_pending_deadlist); 435 dsl_deadlist_close(&ds->ds_deadlist); 436 kmem_free(ds, sizeof (dsl_dataset_t)); 437 dmu_buf_rele(dbuf, tag); 438 return (err); 439 } 440 441 if (!dsl_dataset_is_snapshot(ds)) { 442 ds->ds_snapname[0] = '\0'; 443 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 444 err = dsl_dataset_hold_obj(dp, 445 dsl_dataset_phys(ds)->ds_prev_snap_obj, 446 ds, &ds->ds_prev); 447 } 448 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 449 int zaperr = zap_lookup(mos, ds->ds_object, 450 DS_FIELD_BOOKMARK_NAMES, 451 sizeof (ds->ds_bookmarks), 1, 452 &ds->ds_bookmarks); 453 if (zaperr != ENOENT) 454 VERIFY0(zaperr); 455 } 456 } else { 457 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 458 err = dsl_dataset_get_snapname(ds); 459 if (err == 0 && 460 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 461 err = zap_count( 462 ds->ds_dir->dd_pool->dp_meta_objset, 463 dsl_dataset_phys(ds)->ds_userrefs_obj, 464 &ds->ds_userrefs); 465 } 466 } 467 468 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 469 err = dsl_prop_get_int_ds(ds, 470 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 471 &ds->ds_reserved); 472 if (err == 0) { 473 err = dsl_prop_get_int_ds(ds, 474 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 475 &ds->ds_quota); 476 } 477 } else { 478 ds->ds_reserved = ds->ds_quota = 0; 479 } 480 481 if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds, 482 dsl_dataset_evict)) != NULL) { 483 bplist_destroy(&ds->ds_pending_deadlist); 484 dsl_deadlist_close(&ds->ds_deadlist); 485 if (ds->ds_prev) 486 dsl_dataset_rele(ds->ds_prev, ds); 487 dsl_dir_rele(ds->ds_dir, ds); 488 mutex_destroy(&ds->ds_lock); 489 mutex_destroy(&ds->ds_opening_lock); 490 mutex_destroy(&ds->ds_sendstream_lock); 491 refcount_destroy(&ds->ds_longholds); 492 kmem_free(ds, sizeof (dsl_dataset_t)); 493 if (err != 0) { 494 dmu_buf_rele(dbuf, tag); 495 return (err); 496 } 497 ds = winner; 498 } else { 499 ds->ds_fsid_guid = 500 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 501 } 502 } 503 ASSERT3P(ds->ds_dbuf, ==, dbuf); 504 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 505 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 506 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 507 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 508 *dsp = ds; 509 return (0); 510} 511 512int 513dsl_dataset_hold(dsl_pool_t *dp, const char *name, 514 void *tag, dsl_dataset_t **dsp) 515{ 516 dsl_dir_t *dd; 517 const char *snapname; 518 uint64_t obj; 519 int err = 0; 520 521 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 522 if (err != 0) 523 return (err); 524 525 ASSERT(dsl_pool_config_held(dp)); 526 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 527 if (obj != 0) 528 err = dsl_dataset_hold_obj(dp, obj, tag, dsp); 529 else 530 err = SET_ERROR(ENOENT); 531 532 /* we may be looking for a snapshot */ 533 if (err == 0 && snapname != NULL) { 534 dsl_dataset_t *ds; 535 536 if (*snapname++ != '@') { 537 dsl_dataset_rele(*dsp, tag); 538 dsl_dir_rele(dd, FTAG); 539 return (SET_ERROR(ENOENT)); 540 } 541 542 dprintf("looking for snapshot '%s'\n", snapname); 543 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 544 if (err == 0) 545 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 546 dsl_dataset_rele(*dsp, tag); 547 548 if (err == 0) { 549 mutex_enter(&ds->ds_lock); 550 if (ds->ds_snapname[0] == 0) 551 (void) strlcpy(ds->ds_snapname, snapname, 552 sizeof (ds->ds_snapname)); 553 mutex_exit(&ds->ds_lock); 554 *dsp = ds; 555 } 556 } 557 558 dsl_dir_rele(dd, FTAG); 559 return (err); 560} 561 562int 563dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 564 void *tag, dsl_dataset_t **dsp) 565{ 566 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 567 if (err != 0) 568 return (err); 569 if (!dsl_dataset_tryown(*dsp, tag)) { 570 dsl_dataset_rele(*dsp, tag); 571 *dsp = NULL; 572 return (SET_ERROR(EBUSY)); 573 } 574 return (0); 575} 576 577int 578dsl_dataset_own(dsl_pool_t *dp, const char *name, 579 void *tag, dsl_dataset_t **dsp) 580{ 581 int err = dsl_dataset_hold(dp, name, tag, dsp); 582 if (err != 0) 583 return (err); 584 if (!dsl_dataset_tryown(*dsp, tag)) { 585 dsl_dataset_rele(*dsp, tag); 586 return (SET_ERROR(EBUSY)); 587 } 588 return (0); 589} 590 591/* 592 * See the comment above dsl_pool_hold() for details. In summary, a long 593 * hold is used to prevent destruction of a dataset while the pool hold 594 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 595 * 596 * The dataset and pool must be held when this function is called. After it 597 * is called, the pool hold may be released while the dataset is still held 598 * and accessed. 599 */ 600void 601dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 602{ 603 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 604 (void) refcount_add(&ds->ds_longholds, tag); 605} 606 607void 608dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 609{ 610 (void) refcount_remove(&ds->ds_longholds, tag); 611} 612 613/* Return B_TRUE if there are any long holds on this dataset. */ 614boolean_t 615dsl_dataset_long_held(dsl_dataset_t *ds) 616{ 617 return (!refcount_is_zero(&ds->ds_longholds)); 618} 619 620void 621dsl_dataset_name(dsl_dataset_t *ds, char *name) 622{ 623 if (ds == NULL) { 624 (void) strcpy(name, "mos"); 625 } else { 626 dsl_dir_name(ds->ds_dir, name); 627 VERIFY0(dsl_dataset_get_snapname(ds)); 628 if (ds->ds_snapname[0]) { 629 (void) strcat(name, "@"); 630 /* 631 * We use a "recursive" mutex so that we 632 * can call dprintf_ds() with ds_lock held. 633 */ 634 if (!MUTEX_HELD(&ds->ds_lock)) { 635 mutex_enter(&ds->ds_lock); 636 (void) strcat(name, ds->ds_snapname); 637 mutex_exit(&ds->ds_lock); 638 } else { 639 (void) strcat(name, ds->ds_snapname); 640 } 641 } 642 } 643} 644 645void 646dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 647{ 648 dmu_buf_rele(ds->ds_dbuf, tag); 649} 650 651void 652dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 653{ 654 ASSERT3P(ds->ds_owner, ==, tag); 655 ASSERT(ds->ds_dbuf != NULL); 656 657 mutex_enter(&ds->ds_lock); 658 ds->ds_owner = NULL; 659 mutex_exit(&ds->ds_lock); 660 dsl_dataset_long_rele(ds, tag); 661 dsl_dataset_rele(ds, tag); 662} 663 664boolean_t 665dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 666{ 667 boolean_t gotit = FALSE; 668 669 mutex_enter(&ds->ds_lock); 670 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 671 ds->ds_owner = tag; 672 dsl_dataset_long_hold(ds, tag); 673 gotit = TRUE; 674 } 675 mutex_exit(&ds->ds_lock); 676 return (gotit); 677} 678 679uint64_t 680dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 681 uint64_t flags, dmu_tx_t *tx) 682{ 683 dsl_pool_t *dp = dd->dd_pool; 684 dmu_buf_t *dbuf; 685 dsl_dataset_phys_t *dsphys; 686 uint64_t dsobj; 687 objset_t *mos = dp->dp_meta_objset; 688 689 if (origin == NULL) 690 origin = dp->dp_origin_snap; 691 692 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 693 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 694 ASSERT(dmu_tx_is_syncing(tx)); 695 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 696 697 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 698 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 699 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 700 dmu_buf_will_dirty(dbuf, tx); 701 dsphys = dbuf->db_data; 702 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 703 dsphys->ds_dir_obj = dd->dd_object; 704 dsphys->ds_flags = flags; 705 dsphys->ds_fsid_guid = unique_create(); 706 do { 707 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 708 sizeof (dsphys->ds_guid)); 709 } while (dsphys->ds_guid == 0); 710 dsphys->ds_snapnames_zapobj = 711 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 712 DMU_OT_NONE, 0, tx); 713 dsphys->ds_creation_time = gethrestime_sec(); 714 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 715 716 if (origin == NULL) { 717 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 718 } else { 719 dsl_dataset_t *ohds; /* head of the origin snapshot */ 720 721 dsphys->ds_prev_snap_obj = origin->ds_object; 722 dsphys->ds_prev_snap_txg = 723 dsl_dataset_phys(origin)->ds_creation_txg; 724 dsphys->ds_referenced_bytes = 725 dsl_dataset_phys(origin)->ds_referenced_bytes; 726 dsphys->ds_compressed_bytes = 727 dsl_dataset_phys(origin)->ds_compressed_bytes; 728 dsphys->ds_uncompressed_bytes = 729 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 730 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 731 732 /* 733 * Inherit flags that describe the dataset's contents 734 * (INCONSISTENT) or properties (Case Insensitive). 735 */ 736 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 737 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 738 739 if (origin->ds_large_blocks) 740 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); 741 742 dmu_buf_will_dirty(origin->ds_dbuf, tx); 743 dsl_dataset_phys(origin)->ds_num_children++; 744 745 VERIFY0(dsl_dataset_hold_obj(dp, 746 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 747 FTAG, &ohds)); 748 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 749 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 750 dsl_dataset_rele(ohds, FTAG); 751 752 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 753 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 754 dsl_dataset_phys(origin)->ds_next_clones_obj = 755 zap_create(mos, 756 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 757 } 758 VERIFY0(zap_add_int(mos, 759 dsl_dataset_phys(origin)->ds_next_clones_obj, 760 dsobj, tx)); 761 } 762 763 dmu_buf_will_dirty(dd->dd_dbuf, tx); 764 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 765 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 766 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 767 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 768 dsl_dir_phys(origin->ds_dir)->dd_clones = 769 zap_create(mos, 770 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 771 } 772 VERIFY0(zap_add_int(mos, 773 dsl_dir_phys(origin->ds_dir)->dd_clones, 774 dsobj, tx)); 775 } 776 } 777 778 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 779 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 780 781 dmu_buf_rele(dbuf, FTAG); 782 783 dmu_buf_will_dirty(dd->dd_dbuf, tx); 784 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 785 786 return (dsobj); 787} 788 789static void 790dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 791{ 792 objset_t *os; 793 794 VERIFY0(dmu_objset_from_ds(ds, &os)); 795 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 796 dsl_dataset_dirty(ds, tx); 797} 798 799uint64_t 800dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 801 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 802{ 803 dsl_pool_t *dp = pdd->dd_pool; 804 uint64_t dsobj, ddobj; 805 dsl_dir_t *dd; 806 807 ASSERT(dmu_tx_is_syncing(tx)); 808 ASSERT(lastname[0] != '@'); 809 810 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 811 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 812 813 dsobj = dsl_dataset_create_sync_dd(dd, origin, 814 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 815 816 dsl_deleg_set_create_perms(dd, tx, cr); 817 818 /* 819 * Since we're creating a new node we know it's a leaf, so we can 820 * initialize the counts if the limit feature is active. 821 */ 822 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 823 uint64_t cnt = 0; 824 objset_t *os = dd->dd_pool->dp_meta_objset; 825 826 dsl_dir_zapify(dd, tx); 827 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 828 sizeof (cnt), 1, &cnt, tx)); 829 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 830 sizeof (cnt), 1, &cnt, tx)); 831 } 832 833 dsl_dir_rele(dd, FTAG); 834 835 /* 836 * If we are creating a clone, make sure we zero out any stale 837 * data from the origin snapshots zil header. 838 */ 839 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 840 dsl_dataset_t *ds; 841 842 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 843 dsl_dataset_zero_zil(ds, tx); 844 dsl_dataset_rele(ds, FTAG); 845 } 846 847 return (dsobj); 848} 849 850#ifdef __FreeBSD__ 851/* FreeBSD ioctl compat begin */ 852struct destroyarg { 853 nvlist_t *nvl; 854 const char *snapname; 855}; 856 857static int 858dsl_check_snap_cb(const char *name, void *arg) 859{ 860 struct destroyarg *da = arg; 861 dsl_dataset_t *ds; 862 char *dsname; 863 864 dsname = kmem_asprintf("%s@%s", name, da->snapname); 865 fnvlist_add_boolean(da->nvl, dsname); 866 kmem_free(dsname, strlen(dsname) + 1); 867 868 return (0); 869} 870 871int 872dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 873 nvlist_t *snaps) 874{ 875 struct destroyarg *da; 876 int err; 877 878 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 879 da->nvl = snaps; 880 da->snapname = snapname; 881 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 882 DS_FIND_CHILDREN); 883 kmem_free(da, sizeof (struct destroyarg)); 884 885 return (err); 886} 887/* FreeBSD ioctl compat end */ 888#endif /* __FreeBSD__ */ 889 890/* 891 * The unique space in the head dataset can be calculated by subtracting 892 * the space used in the most recent snapshot, that is still being used 893 * in this file system, from the space currently in use. To figure out 894 * the space in the most recent snapshot still in use, we need to take 895 * the total space used in the snapshot and subtract out the space that 896 * has been freed up since the snapshot was taken. 897 */ 898void 899dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 900{ 901 uint64_t mrs_used; 902 uint64_t dlused, dlcomp, dluncomp; 903 904 ASSERT(!dsl_dataset_is_snapshot(ds)); 905 906 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 907 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 908 else 909 mrs_used = 0; 910 911 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 912 913 ASSERT3U(dlused, <=, mrs_used); 914 dsl_dataset_phys(ds)->ds_unique_bytes = 915 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 916 917 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 918 SPA_VERSION_UNIQUE_ACCURATE) 919 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 920} 921 922void 923dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 924 dmu_tx_t *tx) 925{ 926 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 927 uint64_t count; 928 int err; 929 930 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 931 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 932 obj, tx); 933 /* 934 * The err should not be ENOENT, but a bug in a previous version 935 * of the code could cause upgrade_clones_cb() to not set 936 * ds_next_snap_obj when it should, leading to a missing entry. 937 * If we knew that the pool was created after 938 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 939 * ENOENT. However, at least we can check that we don't have 940 * too many entries in the next_clones_obj even after failing to 941 * remove this one. 942 */ 943 if (err != ENOENT) 944 VERIFY0(err); 945 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 946 &count)); 947 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 948} 949 950 951blkptr_t * 952dsl_dataset_get_blkptr(dsl_dataset_t *ds) 953{ 954 return (&dsl_dataset_phys(ds)->ds_bp); 955} 956 957void 958dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 959{ 960 ASSERT(dmu_tx_is_syncing(tx)); 961 /* If it's the meta-objset, set dp_meta_rootbp */ 962 if (ds == NULL) { 963 tx->tx_pool->dp_meta_rootbp = *bp; 964 } else { 965 dmu_buf_will_dirty(ds->ds_dbuf, tx); 966 dsl_dataset_phys(ds)->ds_bp = *bp; 967 } 968} 969 970spa_t * 971dsl_dataset_get_spa(dsl_dataset_t *ds) 972{ 973 return (ds->ds_dir->dd_pool->dp_spa); 974} 975 976void 977dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 978{ 979 dsl_pool_t *dp; 980 981 if (ds == NULL) /* this is the meta-objset */ 982 return; 983 984 ASSERT(ds->ds_objset != NULL); 985 986 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 987 panic("dirtying snapshot!"); 988 989 dp = ds->ds_dir->dd_pool; 990 991 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 992 /* up the hold count until we can be written out */ 993 dmu_buf_add_ref(ds->ds_dbuf, ds); 994 } 995} 996 997boolean_t 998dsl_dataset_is_dirty(dsl_dataset_t *ds) 999{ 1000 for (int t = 0; t < TXG_SIZE; t++) { 1001 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1002 ds, t)) 1003 return (B_TRUE); 1004 } 1005 return (B_FALSE); 1006} 1007 1008static int 1009dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1010{ 1011 uint64_t asize; 1012 1013 if (!dmu_tx_is_syncing(tx)) 1014 return (0); 1015 1016 /* 1017 * If there's an fs-only reservation, any blocks that might become 1018 * owned by the snapshot dataset must be accommodated by space 1019 * outside of the reservation. 1020 */ 1021 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1022 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1023 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1024 return (SET_ERROR(ENOSPC)); 1025 1026 /* 1027 * Propagate any reserved space for this snapshot to other 1028 * snapshot checks in this sync group. 1029 */ 1030 if (asize > 0) 1031 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1032 1033 return (0); 1034} 1035 1036typedef struct dsl_dataset_snapshot_arg { 1037 nvlist_t *ddsa_snaps; 1038 nvlist_t *ddsa_props; 1039 nvlist_t *ddsa_errors; 1040 cred_t *ddsa_cr; 1041} dsl_dataset_snapshot_arg_t; 1042 1043int 1044dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1045 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1046{ 1047 int error; 1048 uint64_t value; 1049 1050 ds->ds_trysnap_txg = tx->tx_txg; 1051 1052 if (!dmu_tx_is_syncing(tx)) 1053 return (0); 1054 1055 /* 1056 * We don't allow multiple snapshots of the same txg. If there 1057 * is already one, try again. 1058 */ 1059 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1060 return (SET_ERROR(EAGAIN)); 1061 1062 /* 1063 * Check for conflicting snapshot name. 1064 */ 1065 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1066 if (error == 0) 1067 return (SET_ERROR(EEXIST)); 1068 if (error != ENOENT) 1069 return (error); 1070 1071 /* 1072 * We don't allow taking snapshots of inconsistent datasets, such as 1073 * those into which we are currently receiving. However, if we are 1074 * creating this snapshot as part of a receive, this check will be 1075 * executed atomically with respect to the completion of the receive 1076 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1077 * case we ignore this, knowing it will be fixed up for us shortly in 1078 * dmu_recv_end_sync(). 1079 */ 1080 if (!recv && DS_IS_INCONSISTENT(ds)) 1081 return (SET_ERROR(EBUSY)); 1082 1083 /* 1084 * Skip the check for temporary snapshots or if we have already checked 1085 * the counts in dsl_dataset_snapshot_check. This means we really only 1086 * check the count here when we're receiving a stream. 1087 */ 1088 if (cnt != 0 && cr != NULL) { 1089 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1090 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1091 if (error != 0) 1092 return (error); 1093 } 1094 1095 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1096 if (error != 0) 1097 return (error); 1098 1099 return (0); 1100} 1101 1102static int 1103dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1104{ 1105 dsl_dataset_snapshot_arg_t *ddsa = arg; 1106 dsl_pool_t *dp = dmu_tx_pool(tx); 1107 nvpair_t *pair; 1108 int rv = 0; 1109 1110 /* 1111 * Pre-compute how many total new snapshots will be created for each 1112 * level in the tree and below. This is needed for validating the 1113 * snapshot limit when either taking a recursive snapshot or when 1114 * taking multiple snapshots. 1115 * 1116 * The problem is that the counts are not actually adjusted when 1117 * we are checking, only when we finally sync. For a single snapshot, 1118 * this is easy, the count will increase by 1 at each node up the tree, 1119 * but its more complicated for the recursive/multiple snapshot case. 1120 * 1121 * The dsl_fs_ss_limit_check function does recursively check the count 1122 * at each level up the tree but since it is validating each snapshot 1123 * independently we need to be sure that we are validating the complete 1124 * count for the entire set of snapshots. We do this by rolling up the 1125 * counts for each component of the name into an nvlist and then 1126 * checking each of those cases with the aggregated count. 1127 * 1128 * This approach properly handles not only the recursive snapshot 1129 * case (where we get all of those on the ddsa_snaps list) but also 1130 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1131 * validate the limit on 'a' using a count of 2). 1132 * 1133 * We validate the snapshot names in the third loop and only report 1134 * name errors once. 1135 */ 1136 if (dmu_tx_is_syncing(tx)) { 1137 nvlist_t *cnt_track = NULL; 1138 cnt_track = fnvlist_alloc(); 1139 1140 /* Rollup aggregated counts into the cnt_track list */ 1141 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1142 pair != NULL; 1143 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1144 char *pdelim; 1145 uint64_t val; 1146 char nm[MAXPATHLEN]; 1147 1148 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1149 pdelim = strchr(nm, '@'); 1150 if (pdelim == NULL) 1151 continue; 1152 *pdelim = '\0'; 1153 1154 do { 1155 if (nvlist_lookup_uint64(cnt_track, nm, 1156 &val) == 0) { 1157 /* update existing entry */ 1158 fnvlist_add_uint64(cnt_track, nm, 1159 val + 1); 1160 } else { 1161 /* add to list */ 1162 fnvlist_add_uint64(cnt_track, nm, 1); 1163 } 1164 1165 pdelim = strrchr(nm, '/'); 1166 if (pdelim != NULL) 1167 *pdelim = '\0'; 1168 } while (pdelim != NULL); 1169 } 1170 1171 /* Check aggregated counts at each level */ 1172 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1173 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1174 int error = 0; 1175 char *name; 1176 uint64_t cnt = 0; 1177 dsl_dataset_t *ds; 1178 1179 name = nvpair_name(pair); 1180 cnt = fnvpair_value_uint64(pair); 1181 ASSERT(cnt > 0); 1182 1183 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1184 if (error == 0) { 1185 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1186 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1187 ddsa->ddsa_cr); 1188 dsl_dataset_rele(ds, FTAG); 1189 } 1190 1191 if (error != 0) { 1192 if (ddsa->ddsa_errors != NULL) 1193 fnvlist_add_int32(ddsa->ddsa_errors, 1194 name, error); 1195 rv = error; 1196 /* only report one error for this check */ 1197 break; 1198 } 1199 } 1200 nvlist_free(cnt_track); 1201 } 1202 1203 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1204 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1205 int error = 0; 1206 dsl_dataset_t *ds; 1207 char *name, *atp; 1208 char dsname[MAXNAMELEN]; 1209 1210 name = nvpair_name(pair); 1211 if (strlen(name) >= MAXNAMELEN) 1212 error = SET_ERROR(ENAMETOOLONG); 1213 if (error == 0) { 1214 atp = strchr(name, '@'); 1215 if (atp == NULL) 1216 error = SET_ERROR(EINVAL); 1217 if (error == 0) 1218 (void) strlcpy(dsname, name, atp - name + 1); 1219 } 1220 if (error == 0) 1221 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1222 if (error == 0) { 1223 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1224 error = dsl_dataset_snapshot_check_impl(ds, 1225 atp + 1, tx, B_FALSE, 0, NULL); 1226 dsl_dataset_rele(ds, FTAG); 1227 } 1228 1229 if (error != 0) { 1230 if (ddsa->ddsa_errors != NULL) { 1231 fnvlist_add_int32(ddsa->ddsa_errors, 1232 name, error); 1233 } 1234 rv = error; 1235 } 1236 } 1237 1238 return (rv); 1239} 1240 1241void 1242dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1243 dmu_tx_t *tx) 1244{ 1245 static zil_header_t zero_zil; 1246 1247 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1248 dmu_buf_t *dbuf; 1249 dsl_dataset_phys_t *dsphys; 1250 uint64_t dsobj, crtxg; 1251 objset_t *mos = dp->dp_meta_objset; 1252 objset_t *os; 1253 1254 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1255 1256 /* 1257 * If we are on an old pool, the zil must not be active, in which 1258 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1259 */ 1260 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1261 dmu_objset_from_ds(ds, &os) != 0 || 1262 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1263 sizeof (zero_zil)) == 0); 1264 1265 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1266 1267 /* 1268 * The origin's ds_creation_txg has to be < TXG_INITIAL 1269 */ 1270 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1271 crtxg = 1; 1272 else 1273 crtxg = tx->tx_txg; 1274 1275 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1276 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1277 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1278 dmu_buf_will_dirty(dbuf, tx); 1279 dsphys = dbuf->db_data; 1280 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1281 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1282 dsphys->ds_fsid_guid = unique_create(); 1283 do { 1284 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1285 sizeof (dsphys->ds_guid)); 1286 } while (dsphys->ds_guid == 0); 1287 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1288 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1289 dsphys->ds_next_snap_obj = ds->ds_object; 1290 dsphys->ds_num_children = 1; 1291 dsphys->ds_creation_time = gethrestime_sec(); 1292 dsphys->ds_creation_txg = crtxg; 1293 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1294 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1295 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1296 dsphys->ds_uncompressed_bytes = 1297 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1298 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1299 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1300 dmu_buf_rele(dbuf, FTAG); 1301 1302 if (ds->ds_large_blocks) 1303 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); 1304 1305 ASSERT3U(ds->ds_prev != 0, ==, 1306 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1307 if (ds->ds_prev) { 1308 uint64_t next_clones_obj = 1309 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1310 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1311 ds->ds_object || 1312 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1313 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1314 ds->ds_object) { 1315 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1316 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1317 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1318 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1319 } else if (next_clones_obj != 0) { 1320 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1321 dsphys->ds_next_snap_obj, tx); 1322 VERIFY0(zap_add_int(mos, 1323 next_clones_obj, dsobj, tx)); 1324 } 1325 } 1326 1327 /* 1328 * If we have a reference-reservation on this dataset, we will 1329 * need to increase the amount of refreservation being charged 1330 * since our unique space is going to zero. 1331 */ 1332 if (ds->ds_reserved) { 1333 int64_t delta; 1334 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1335 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1336 ds->ds_reserved); 1337 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1338 delta, 0, 0, tx); 1339 } 1340 1341 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1342 dsl_dataset_phys(ds)->ds_deadlist_obj = 1343 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1344 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1345 dsl_deadlist_close(&ds->ds_deadlist); 1346 dsl_deadlist_open(&ds->ds_deadlist, mos, 1347 dsl_dataset_phys(ds)->ds_deadlist_obj); 1348 dsl_deadlist_add_key(&ds->ds_deadlist, 1349 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1350 1351 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1352 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1353 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1354 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1355 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1356 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1357 1358 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1359 snapname, 8, 1, &dsobj, tx)); 1360 1361 if (ds->ds_prev) 1362 dsl_dataset_rele(ds->ds_prev, ds); 1363 VERIFY0(dsl_dataset_hold_obj(dp, 1364 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1365 1366 dsl_scan_ds_snapshotted(ds, tx); 1367 1368 dsl_dir_snap_cmtime_update(ds->ds_dir); 1369 1370 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1371} 1372 1373static void 1374dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1375{ 1376 dsl_dataset_snapshot_arg_t *ddsa = arg; 1377 dsl_pool_t *dp = dmu_tx_pool(tx); 1378 nvpair_t *pair; 1379 1380 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1381 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1382 dsl_dataset_t *ds; 1383 char *name, *atp; 1384 char dsname[MAXNAMELEN]; 1385 1386 name = nvpair_name(pair); 1387 atp = strchr(name, '@'); 1388 (void) strlcpy(dsname, name, atp - name + 1); 1389 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1390 1391 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1392 if (ddsa->ddsa_props != NULL) { 1393 dsl_props_set_sync_impl(ds->ds_prev, 1394 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1395 } 1396 dsl_dataset_rele(ds, FTAG); 1397 } 1398} 1399 1400/* 1401 * The snapshots must all be in the same pool. 1402 * All-or-nothing: if there are any failures, nothing will be modified. 1403 */ 1404int 1405dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1406{ 1407 dsl_dataset_snapshot_arg_t ddsa; 1408 nvpair_t *pair; 1409 boolean_t needsuspend; 1410 int error; 1411 spa_t *spa; 1412 char *firstname; 1413 nvlist_t *suspended = NULL; 1414 1415 pair = nvlist_next_nvpair(snaps, NULL); 1416 if (pair == NULL) 1417 return (0); 1418 firstname = nvpair_name(pair); 1419 1420 error = spa_open(firstname, &spa, FTAG); 1421 if (error != 0) 1422 return (error); 1423 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1424 spa_close(spa, FTAG); 1425 1426 if (needsuspend) { 1427 suspended = fnvlist_alloc(); 1428 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1429 pair = nvlist_next_nvpair(snaps, pair)) { 1430 char fsname[MAXNAMELEN]; 1431 char *snapname = nvpair_name(pair); 1432 char *atp; 1433 void *cookie; 1434 1435 atp = strchr(snapname, '@'); 1436 if (atp == NULL) { 1437 error = SET_ERROR(EINVAL); 1438 break; 1439 } 1440 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1441 1442 error = zil_suspend(fsname, &cookie); 1443 if (error != 0) 1444 break; 1445 fnvlist_add_uint64(suspended, fsname, 1446 (uintptr_t)cookie); 1447 } 1448 } 1449 1450 ddsa.ddsa_snaps = snaps; 1451 ddsa.ddsa_props = props; 1452 ddsa.ddsa_errors = errors; 1453 ddsa.ddsa_cr = CRED(); 1454 1455 if (error == 0) { 1456 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1457 dsl_dataset_snapshot_sync, &ddsa, 1458 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1459 } 1460 1461 if (suspended != NULL) { 1462 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1463 pair = nvlist_next_nvpair(suspended, pair)) { 1464 zil_resume((void *)(uintptr_t) 1465 fnvpair_value_uint64(pair)); 1466 } 1467 fnvlist_free(suspended); 1468 } 1469 1470#ifdef __FreeBSD__ 1471#ifdef _KERNEL 1472 if (error == 0) { 1473 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1474 pair = nvlist_next_nvpair(snaps, pair)) { 1475 char *snapname = nvpair_name(pair); 1476 zvol_create_minors(snapname); 1477 } 1478 } 1479#endif 1480#endif 1481 return (error); 1482} 1483 1484typedef struct dsl_dataset_snapshot_tmp_arg { 1485 const char *ddsta_fsname; 1486 const char *ddsta_snapname; 1487 minor_t ddsta_cleanup_minor; 1488 const char *ddsta_htag; 1489} dsl_dataset_snapshot_tmp_arg_t; 1490 1491static int 1492dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1493{ 1494 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1495 dsl_pool_t *dp = dmu_tx_pool(tx); 1496 dsl_dataset_t *ds; 1497 int error; 1498 1499 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1500 if (error != 0) 1501 return (error); 1502 1503 /* NULL cred means no limit check for tmp snapshot */ 1504 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1505 tx, B_FALSE, 0, NULL); 1506 if (error != 0) { 1507 dsl_dataset_rele(ds, FTAG); 1508 return (error); 1509 } 1510 1511 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1512 dsl_dataset_rele(ds, FTAG); 1513 return (SET_ERROR(ENOTSUP)); 1514 } 1515 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1516 B_TRUE, tx); 1517 if (error != 0) { 1518 dsl_dataset_rele(ds, FTAG); 1519 return (error); 1520 } 1521 1522 dsl_dataset_rele(ds, FTAG); 1523 return (0); 1524} 1525 1526static void 1527dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1528{ 1529 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1530 dsl_pool_t *dp = dmu_tx_pool(tx); 1531 dsl_dataset_t *ds; 1532 1533 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1534 1535 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1536 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1537 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1538 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1539 1540 dsl_dataset_rele(ds, FTAG); 1541} 1542 1543int 1544dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1545 minor_t cleanup_minor, const char *htag) 1546{ 1547 dsl_dataset_snapshot_tmp_arg_t ddsta; 1548 int error; 1549 spa_t *spa; 1550 boolean_t needsuspend; 1551 void *cookie; 1552 1553 ddsta.ddsta_fsname = fsname; 1554 ddsta.ddsta_snapname = snapname; 1555 ddsta.ddsta_cleanup_minor = cleanup_minor; 1556 ddsta.ddsta_htag = htag; 1557 1558 error = spa_open(fsname, &spa, FTAG); 1559 if (error != 0) 1560 return (error); 1561 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1562 spa_close(spa, FTAG); 1563 1564 if (needsuspend) { 1565 error = zil_suspend(fsname, &cookie); 1566 if (error != 0) 1567 return (error); 1568 } 1569 1570 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1571 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1572 1573 if (needsuspend) 1574 zil_resume(cookie); 1575 return (error); 1576} 1577 1578 1579void 1580dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1581{ 1582 ASSERT(dmu_tx_is_syncing(tx)); 1583 ASSERT(ds->ds_objset != NULL); 1584 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1585 1586 /* 1587 * in case we had to change ds_fsid_guid when we opened it, 1588 * sync it out now. 1589 */ 1590 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1591 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1592 1593 dmu_objset_sync(ds->ds_objset, zio, tx); 1594 1595 if (ds->ds_need_large_blocks && !ds->ds_large_blocks) { 1596 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); 1597 ds->ds_large_blocks = B_TRUE; 1598 } 1599} 1600 1601static void 1602get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1603{ 1604 uint64_t count = 0; 1605 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1606 zap_cursor_t zc; 1607 zap_attribute_t za; 1608 nvlist_t *propval = fnvlist_alloc(); 1609 nvlist_t *val = fnvlist_alloc(); 1610 1611 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1612 1613 /* 1614 * There may be missing entries in ds_next_clones_obj 1615 * due to a bug in a previous version of the code. 1616 * Only trust it if it has the right number of entries. 1617 */ 1618 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1619 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1620 &count)); 1621 } 1622 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1623 goto fail; 1624 for (zap_cursor_init(&zc, mos, 1625 dsl_dataset_phys(ds)->ds_next_clones_obj); 1626 zap_cursor_retrieve(&zc, &za) == 0; 1627 zap_cursor_advance(&zc)) { 1628 dsl_dataset_t *clone; 1629 char buf[ZFS_MAXNAMELEN]; 1630 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1631 za.za_first_integer, FTAG, &clone)); 1632 dsl_dir_name(clone->ds_dir, buf); 1633 fnvlist_add_boolean(val, buf); 1634 dsl_dataset_rele(clone, FTAG); 1635 } 1636 zap_cursor_fini(&zc); 1637 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1638 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1639fail: 1640 nvlist_free(val); 1641 nvlist_free(propval); 1642} 1643 1644void 1645dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1646{ 1647 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1648 uint64_t refd, avail, uobjs, aobjs, ratio; 1649 1650 ASSERT(dsl_pool_config_held(dp)); 1651 1652 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1653 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1654 dsl_dataset_phys(ds)->ds_compressed_bytes); 1655 1656 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1657 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1658 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1659 1660 if (dsl_dataset_is_snapshot(ds)) { 1661 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1662 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1663 dsl_dataset_phys(ds)->ds_unique_bytes); 1664 get_clones_stat(ds, nv); 1665 } else { 1666 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1667 char buf[MAXNAMELEN]; 1668 dsl_dataset_name(ds->ds_prev, buf); 1669 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1670 } 1671 1672 dsl_dir_stats(ds->ds_dir, nv); 1673 } 1674 1675 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1676 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1677 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1678 1679 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1680 dsl_dataset_phys(ds)->ds_creation_time); 1681 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1682 dsl_dataset_phys(ds)->ds_creation_txg); 1683 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1684 ds->ds_quota); 1685 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1686 ds->ds_reserved); 1687 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1688 dsl_dataset_phys(ds)->ds_guid); 1689 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1690 dsl_dataset_phys(ds)->ds_unique_bytes); 1691 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1692 ds->ds_object); 1693 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1694 ds->ds_userrefs); 1695 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1696 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1697 1698 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1699 uint64_t written, comp, uncomp; 1700 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1701 dsl_dataset_t *prev; 1702 1703 int err = dsl_dataset_hold_obj(dp, 1704 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1705 if (err == 0) { 1706 err = dsl_dataset_space_written(prev, ds, &written, 1707 &comp, &uncomp); 1708 dsl_dataset_rele(prev, FTAG); 1709 if (err == 0) { 1710 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1711 written); 1712 } 1713 } 1714 } 1715} 1716 1717void 1718dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1719{ 1720 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1721 ASSERT(dsl_pool_config_held(dp)); 1722 1723 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1724 stat->dds_inconsistent = 1725 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1726 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1727 stat->dds_origin[0] = '\0'; 1728 if (dsl_dataset_is_snapshot(ds)) { 1729 stat->dds_is_snapshot = B_TRUE; 1730 stat->dds_num_clones = 1731 dsl_dataset_phys(ds)->ds_num_children - 1; 1732 } else { 1733 stat->dds_is_snapshot = B_FALSE; 1734 stat->dds_num_clones = 0; 1735 1736 if (dsl_dir_is_clone(ds->ds_dir)) { 1737 dsl_dataset_t *ods; 1738 1739 VERIFY0(dsl_dataset_hold_obj(dp, 1740 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1741 FTAG, &ods)); 1742 dsl_dataset_name(ods, stat->dds_origin); 1743 dsl_dataset_rele(ods, FTAG); 1744 } 1745 } 1746} 1747 1748uint64_t 1749dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1750{ 1751 return (ds->ds_fsid_guid); 1752} 1753 1754void 1755dsl_dataset_space(dsl_dataset_t *ds, 1756 uint64_t *refdbytesp, uint64_t *availbytesp, 1757 uint64_t *usedobjsp, uint64_t *availobjsp) 1758{ 1759 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1760 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1761 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1762 *availbytesp += 1763 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1764 if (ds->ds_quota != 0) { 1765 /* 1766 * Adjust available bytes according to refquota 1767 */ 1768 if (*refdbytesp < ds->ds_quota) 1769 *availbytesp = MIN(*availbytesp, 1770 ds->ds_quota - *refdbytesp); 1771 else 1772 *availbytesp = 0; 1773 } 1774 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1775 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1776} 1777 1778boolean_t 1779dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1780{ 1781 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1782 1783 ASSERT(dsl_pool_config_held(dp)); 1784 if (snap == NULL) 1785 return (B_FALSE); 1786 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1787 dsl_dataset_phys(snap)->ds_creation_txg) { 1788 objset_t *os, *os_snap; 1789 /* 1790 * It may be that only the ZIL differs, because it was 1791 * reset in the head. Don't count that as being 1792 * modified. 1793 */ 1794 if (dmu_objset_from_ds(ds, &os) != 0) 1795 return (B_TRUE); 1796 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1797 return (B_TRUE); 1798 return (bcmp(&os->os_phys->os_meta_dnode, 1799 &os_snap->os_phys->os_meta_dnode, 1800 sizeof (os->os_phys->os_meta_dnode)) != 0); 1801 } 1802 return (B_FALSE); 1803} 1804 1805typedef struct dsl_dataset_rename_snapshot_arg { 1806 const char *ddrsa_fsname; 1807 const char *ddrsa_oldsnapname; 1808 const char *ddrsa_newsnapname; 1809 boolean_t ddrsa_recursive; 1810 dmu_tx_t *ddrsa_tx; 1811} dsl_dataset_rename_snapshot_arg_t; 1812 1813/* ARGSUSED */ 1814static int 1815dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1816 dsl_dataset_t *hds, void *arg) 1817{ 1818 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1819 int error; 1820 uint64_t val; 1821 1822 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1823 if (error != 0) { 1824 /* ignore nonexistent snapshots */ 1825 return (error == ENOENT ? 0 : error); 1826 } 1827 1828 /* new name should not exist */ 1829 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1830 if (error == 0) 1831 error = SET_ERROR(EEXIST); 1832 else if (error == ENOENT) 1833 error = 0; 1834 1835 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1836 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1837 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 1838 error = SET_ERROR(ENAMETOOLONG); 1839 1840 return (error); 1841} 1842 1843static int 1844dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1845{ 1846 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1847 dsl_pool_t *dp = dmu_tx_pool(tx); 1848 dsl_dataset_t *hds; 1849 int error; 1850 1851 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1852 if (error != 0) 1853 return (error); 1854 1855 if (ddrsa->ddrsa_recursive) { 1856 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1857 dsl_dataset_rename_snapshot_check_impl, ddrsa, 1858 DS_FIND_CHILDREN); 1859 } else { 1860 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 1861 } 1862 dsl_dataset_rele(hds, FTAG); 1863 return (error); 1864} 1865 1866static int 1867dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 1868 dsl_dataset_t *hds, void *arg) 1869{ 1870#ifdef __FreeBSD__ 1871#ifdef _KERNEL 1872 char *oldname, *newname; 1873#endif 1874#endif 1875 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1876 dsl_dataset_t *ds; 1877 uint64_t val; 1878 dmu_tx_t *tx = ddrsa->ddrsa_tx; 1879 int error; 1880 1881 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1882 ASSERT(error == 0 || error == ENOENT); 1883 if (error == ENOENT) { 1884 /* ignore nonexistent snapshots */ 1885 return (0); 1886 } 1887 1888 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 1889 1890 /* log before we change the name */ 1891 spa_history_log_internal_ds(ds, "rename", tx, 1892 "-> @%s", ddrsa->ddrsa_newsnapname); 1893 1894 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 1895 B_FALSE)); 1896 mutex_enter(&ds->ds_lock); 1897 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 1898 mutex_exit(&ds->ds_lock); 1899 VERIFY0(zap_add(dp->dp_meta_objset, 1900 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 1901 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 1902 1903#ifdef __FreeBSD__ 1904#ifdef _KERNEL 1905 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1906 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1907 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1908 ddrsa->ddrsa_oldsnapname); 1909 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1910 ddrsa->ddrsa_newsnapname); 1911 zfsvfs_update_fromname(oldname, newname); 1912 zvol_rename_minors(oldname, newname); 1913 kmem_free(newname, MAXPATHLEN); 1914 kmem_free(oldname, MAXPATHLEN); 1915#endif 1916#endif 1917 dsl_dataset_rele(ds, FTAG); 1918 1919 return (0); 1920} 1921 1922static void 1923dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 1924{ 1925 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1926 dsl_pool_t *dp = dmu_tx_pool(tx); 1927 dsl_dataset_t *hds; 1928 1929 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 1930 ddrsa->ddrsa_tx = tx; 1931 if (ddrsa->ddrsa_recursive) { 1932 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1933 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 1934 DS_FIND_CHILDREN)); 1935 } else { 1936 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 1937 } 1938 dsl_dataset_rele(hds, FTAG); 1939} 1940 1941int 1942dsl_dataset_rename_snapshot(const char *fsname, 1943 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 1944{ 1945 dsl_dataset_rename_snapshot_arg_t ddrsa; 1946 1947 ddrsa.ddrsa_fsname = fsname; 1948 ddrsa.ddrsa_oldsnapname = oldsnapname; 1949 ddrsa.ddrsa_newsnapname = newsnapname; 1950 ddrsa.ddrsa_recursive = recursive; 1951 1952 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 1953 dsl_dataset_rename_snapshot_sync, &ddrsa, 1954 1, ZFS_SPACE_CHECK_RESERVED)); 1955} 1956 1957/* 1958 * If we're doing an ownership handoff, we need to make sure that there is 1959 * only one long hold on the dataset. We're not allowed to change anything here 1960 * so we don't permanently release the long hold or regular hold here. We want 1961 * to do this only when syncing to avoid the dataset unexpectedly going away 1962 * when we release the long hold. 1963 */ 1964static int 1965dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 1966{ 1967 boolean_t held; 1968 1969 if (!dmu_tx_is_syncing(tx)) 1970 return (0); 1971 1972 if (owner != NULL) { 1973 VERIFY3P(ds->ds_owner, ==, owner); 1974 dsl_dataset_long_rele(ds, owner); 1975 } 1976 1977 held = dsl_dataset_long_held(ds); 1978 1979 if (owner != NULL) 1980 dsl_dataset_long_hold(ds, owner); 1981 1982 if (held) 1983 return (SET_ERROR(EBUSY)); 1984 1985 return (0); 1986} 1987 1988typedef struct dsl_dataset_rollback_arg { 1989 const char *ddra_fsname; 1990 void *ddra_owner; 1991 nvlist_t *ddra_result; 1992} dsl_dataset_rollback_arg_t; 1993 1994static int 1995dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 1996{ 1997 dsl_dataset_rollback_arg_t *ddra = arg; 1998 dsl_pool_t *dp = dmu_tx_pool(tx); 1999 dsl_dataset_t *ds; 2000 int64_t unused_refres_delta; 2001 int error; 2002 2003 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2004 if (error != 0) 2005 return (error); 2006 2007 /* must not be a snapshot */ 2008 if (dsl_dataset_is_snapshot(ds)) { 2009 dsl_dataset_rele(ds, FTAG); 2010 return (SET_ERROR(EINVAL)); 2011 } 2012 2013 /* must have a most recent snapshot */ 2014 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2015 dsl_dataset_rele(ds, FTAG); 2016 return (SET_ERROR(EINVAL)); 2017 } 2018 2019 /* must not have any bookmarks after the most recent snapshot */ 2020 nvlist_t *proprequest = fnvlist_alloc(); 2021 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2022 nvlist_t *bookmarks = fnvlist_alloc(); 2023 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2024 fnvlist_free(proprequest); 2025 if (error != 0) 2026 return (error); 2027 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2028 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2029 nvlist_t *valuenv = 2030 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2031 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2032 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2033 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2034 fnvlist_free(bookmarks); 2035 dsl_dataset_rele(ds, FTAG); 2036 return (SET_ERROR(EEXIST)); 2037 } 2038 } 2039 fnvlist_free(bookmarks); 2040 2041 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2042 if (error != 0) { 2043 dsl_dataset_rele(ds, FTAG); 2044 return (error); 2045 } 2046 2047 /* 2048 * Check if the snap we are rolling back to uses more than 2049 * the refquota. 2050 */ 2051 if (ds->ds_quota != 0 && 2052 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2053 dsl_dataset_rele(ds, FTAG); 2054 return (SET_ERROR(EDQUOT)); 2055 } 2056 2057 /* 2058 * When we do the clone swap, we will temporarily use more space 2059 * due to the refreservation (the head will no longer have any 2060 * unique space, so the entire amount of the refreservation will need 2061 * to be free). We will immediately destroy the clone, freeing 2062 * this space, but the freeing happens over many txg's. 2063 */ 2064 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2065 dsl_dataset_phys(ds)->ds_unique_bytes); 2066 2067 if (unused_refres_delta > 0 && 2068 unused_refres_delta > 2069 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2070 dsl_dataset_rele(ds, FTAG); 2071 return (SET_ERROR(ENOSPC)); 2072 } 2073 2074 dsl_dataset_rele(ds, FTAG); 2075 return (0); 2076} 2077 2078static void 2079dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2080{ 2081 dsl_dataset_rollback_arg_t *ddra = arg; 2082 dsl_pool_t *dp = dmu_tx_pool(tx); 2083 dsl_dataset_t *ds, *clone; 2084 uint64_t cloneobj; 2085 char namebuf[ZFS_MAXNAMELEN]; 2086 2087 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2088 2089 dsl_dataset_name(ds->ds_prev, namebuf); 2090 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2091 2092 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2093 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2094 2095 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2096 2097 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2098 dsl_dataset_zero_zil(ds, tx); 2099 2100 dsl_destroy_head_sync_impl(clone, tx); 2101 2102 dsl_dataset_rele(clone, FTAG); 2103 dsl_dataset_rele(ds, FTAG); 2104} 2105 2106/* 2107 * Rolls back the given filesystem or volume to the most recent snapshot. 2108 * The name of the most recent snapshot will be returned under key "target" 2109 * in the result nvlist. 2110 * 2111 * If owner != NULL: 2112 * - The existing dataset MUST be owned by the specified owner at entry 2113 * - Upon return, dataset will still be held by the same owner, whether we 2114 * succeed or not. 2115 * 2116 * This mode is required any time the existing filesystem is mounted. See 2117 * notes above zfs_suspend_fs() for further details. 2118 */ 2119int 2120dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2121{ 2122 dsl_dataset_rollback_arg_t ddra; 2123 2124 ddra.ddra_fsname = fsname; 2125 ddra.ddra_owner = owner; 2126 ddra.ddra_result = result; 2127 2128 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2129 dsl_dataset_rollback_sync, &ddra, 2130 1, ZFS_SPACE_CHECK_RESERVED)); 2131} 2132 2133struct promotenode { 2134 list_node_t link; 2135 dsl_dataset_t *ds; 2136}; 2137 2138typedef struct dsl_dataset_promote_arg { 2139 const char *ddpa_clonename; 2140 dsl_dataset_t *ddpa_clone; 2141 list_t shared_snaps, origin_snaps, clone_snaps; 2142 dsl_dataset_t *origin_origin; /* origin of the origin */ 2143 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2144 char *err_ds; 2145 cred_t *cr; 2146} dsl_dataset_promote_arg_t; 2147 2148static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2149static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2150 void *tag); 2151static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2152 2153static int 2154dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2155{ 2156 dsl_dataset_promote_arg_t *ddpa = arg; 2157 dsl_pool_t *dp = dmu_tx_pool(tx); 2158 dsl_dataset_t *hds; 2159 struct promotenode *snap; 2160 dsl_dataset_t *origin_ds; 2161 int err; 2162 uint64_t unused; 2163 uint64_t ss_mv_cnt; 2164 2165 err = promote_hold(ddpa, dp, FTAG); 2166 if (err != 0) 2167 return (err); 2168 2169 hds = ddpa->ddpa_clone; 2170 2171 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2172 promote_rele(ddpa, FTAG); 2173 return (SET_ERROR(EXDEV)); 2174 } 2175 2176 /* 2177 * Compute and check the amount of space to transfer. Since this is 2178 * so expensive, don't do the preliminary check. 2179 */ 2180 if (!dmu_tx_is_syncing(tx)) { 2181 promote_rele(ddpa, FTAG); 2182 return (0); 2183 } 2184 2185 snap = list_head(&ddpa->shared_snaps); 2186 origin_ds = snap->ds; 2187 2188 /* compute origin's new unique space */ 2189 snap = list_tail(&ddpa->clone_snaps); 2190 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2191 origin_ds->ds_object); 2192 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2193 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2194 &ddpa->unique, &unused, &unused); 2195 2196 /* 2197 * Walk the snapshots that we are moving 2198 * 2199 * Compute space to transfer. Consider the incremental changes 2200 * to used by each snapshot: 2201 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2202 * So each snapshot gave birth to: 2203 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2204 * So a sequence would look like: 2205 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2206 * Which simplifies to: 2207 * uN + kN + kN-1 + ... + k1 + k0 2208 * Note however, if we stop before we reach the ORIGIN we get: 2209 * uN + kN + kN-1 + ... + kM - uM-1 2210 */ 2211 ss_mv_cnt = 0; 2212 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2213 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2214 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2215 for (snap = list_head(&ddpa->shared_snaps); snap; 2216 snap = list_next(&ddpa->shared_snaps, snap)) { 2217 uint64_t val, dlused, dlcomp, dluncomp; 2218 dsl_dataset_t *ds = snap->ds; 2219 2220 ss_mv_cnt++; 2221 2222 /* 2223 * If there are long holds, we won't be able to evict 2224 * the objset. 2225 */ 2226 if (dsl_dataset_long_held(ds)) { 2227 err = SET_ERROR(EBUSY); 2228 goto out; 2229 } 2230 2231 /* Check that the snapshot name does not conflict */ 2232 VERIFY0(dsl_dataset_get_snapname(ds)); 2233 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2234 if (err == 0) { 2235 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2236 err = SET_ERROR(EEXIST); 2237 goto out; 2238 } 2239 if (err != ENOENT) 2240 goto out; 2241 2242 /* The very first snapshot does not have a deadlist */ 2243 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2244 continue; 2245 2246 dsl_deadlist_space(&ds->ds_deadlist, 2247 &dlused, &dlcomp, &dluncomp); 2248 ddpa->used += dlused; 2249 ddpa->comp += dlcomp; 2250 ddpa->uncomp += dluncomp; 2251 } 2252 2253 /* 2254 * If we are a clone of a clone then we never reached ORIGIN, 2255 * so we need to subtract out the clone origin's used space. 2256 */ 2257 if (ddpa->origin_origin) { 2258 ddpa->used -= 2259 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2260 ddpa->comp -= 2261 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2262 ddpa->uncomp -= 2263 dsl_dataset_phys(ddpa->origin_origin)-> 2264 ds_uncompressed_bytes; 2265 } 2266 2267 /* Check that there is enough space and limit headroom here */ 2268 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2269 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2270 if (err != 0) 2271 goto out; 2272 2273 /* 2274 * Compute the amounts of space that will be used by snapshots 2275 * after the promotion (for both origin and clone). For each, 2276 * it is the amount of space that will be on all of their 2277 * deadlists (that was not born before their new origin). 2278 */ 2279 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2280 uint64_t space; 2281 2282 /* 2283 * Note, typically this will not be a clone of a clone, 2284 * so dd_origin_txg will be < TXG_INITIAL, so 2285 * these snaplist_space() -> dsl_deadlist_space_range() 2286 * calls will be fast because they do not have to 2287 * iterate over all bps. 2288 */ 2289 snap = list_head(&ddpa->origin_snaps); 2290 err = snaplist_space(&ddpa->shared_snaps, 2291 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2292 if (err != 0) 2293 goto out; 2294 2295 err = snaplist_space(&ddpa->clone_snaps, 2296 snap->ds->ds_dir->dd_origin_txg, &space); 2297 if (err != 0) 2298 goto out; 2299 ddpa->cloneusedsnap += space; 2300 } 2301 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2302 DD_FLAG_USED_BREAKDOWN) { 2303 err = snaplist_space(&ddpa->origin_snaps, 2304 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2305 &ddpa->originusedsnap); 2306 if (err != 0) 2307 goto out; 2308 } 2309 2310out: 2311 promote_rele(ddpa, FTAG); 2312 return (err); 2313} 2314 2315static void 2316dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2317{ 2318 dsl_dataset_promote_arg_t *ddpa = arg; 2319 dsl_pool_t *dp = dmu_tx_pool(tx); 2320 dsl_dataset_t *hds; 2321 struct promotenode *snap; 2322 dsl_dataset_t *origin_ds; 2323 dsl_dataset_t *origin_head; 2324 dsl_dir_t *dd; 2325 dsl_dir_t *odd = NULL; 2326 uint64_t oldnext_obj; 2327 int64_t delta; 2328#if defined(__FreeBSD__) && defined(_KERNEL) 2329 char *oldname, *newname; 2330#endif 2331 2332 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2333 hds = ddpa->ddpa_clone; 2334 2335 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2336 2337 snap = list_head(&ddpa->shared_snaps); 2338 origin_ds = snap->ds; 2339 dd = hds->ds_dir; 2340 2341 snap = list_head(&ddpa->origin_snaps); 2342 origin_head = snap->ds; 2343 2344 /* 2345 * We need to explicitly open odd, since origin_ds's dd will be 2346 * changing. 2347 */ 2348 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2349 NULL, FTAG, &odd)); 2350 2351 /* change origin's next snap */ 2352 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2353 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2354 snap = list_tail(&ddpa->clone_snaps); 2355 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2356 origin_ds->ds_object); 2357 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2358 2359 /* change the origin's next clone */ 2360 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2361 dsl_dataset_remove_from_next_clones(origin_ds, 2362 snap->ds->ds_object, tx); 2363 VERIFY0(zap_add_int(dp->dp_meta_objset, 2364 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2365 oldnext_obj, tx)); 2366 } 2367 2368 /* change origin */ 2369 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2370 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2371 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2372 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2373 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2374 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2375 origin_head->ds_dir->dd_origin_txg = 2376 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2377 2378 /* change dd_clone entries */ 2379 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2380 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2381 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2382 VERIFY0(zap_add_int(dp->dp_meta_objset, 2383 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2384 hds->ds_object, tx)); 2385 2386 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2387 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2388 origin_head->ds_object, tx)); 2389 if (dsl_dir_phys(dd)->dd_clones == 0) { 2390 dsl_dir_phys(dd)->dd_clones = 2391 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2392 DMU_OT_NONE, 0, tx); 2393 } 2394 VERIFY0(zap_add_int(dp->dp_meta_objset, 2395 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2396 } 2397 2398#if defined(__FreeBSD__) && defined(_KERNEL) 2399 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2400 mutex_enter(&spa_namespace_lock); 2401 2402 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2403 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2404#endif 2405 2406 /* move snapshots to this dir */ 2407 for (snap = list_head(&ddpa->shared_snaps); snap; 2408 snap = list_next(&ddpa->shared_snaps, snap)) { 2409 dsl_dataset_t *ds = snap->ds; 2410 2411 /* 2412 * Property callbacks are registered to a particular 2413 * dsl_dir. Since ours is changing, evict the objset 2414 * so that they will be unregistered from the old dsl_dir. 2415 */ 2416 if (ds->ds_objset) { 2417 dmu_objset_evict(ds->ds_objset); 2418 ds->ds_objset = NULL; 2419 } 2420 2421 /* move snap name entry */ 2422 VERIFY0(dsl_dataset_get_snapname(ds)); 2423 VERIFY0(dsl_dataset_snap_remove(origin_head, 2424 ds->ds_snapname, tx, B_TRUE)); 2425 VERIFY0(zap_add(dp->dp_meta_objset, 2426 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2427 8, 1, &ds->ds_object, tx)); 2428 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2429 DD_FIELD_SNAPSHOT_COUNT, tx); 2430 2431 /* change containing dsl_dir */ 2432 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2433 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2434 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2435 ASSERT3P(ds->ds_dir, ==, odd); 2436 dsl_dir_rele(ds->ds_dir, ds); 2437 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2438 NULL, ds, &ds->ds_dir)); 2439 2440#if defined(__FreeBSD__) && defined(_KERNEL) 2441 dsl_dataset_name(ds, newname); 2442 zfsvfs_update_fromname(oldname, newname); 2443 zvol_rename_minors(oldname, newname); 2444#endif 2445 2446 /* move any clone references */ 2447 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2448 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2449 zap_cursor_t zc; 2450 zap_attribute_t za; 2451 2452 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2453 dsl_dataset_phys(ds)->ds_next_clones_obj); 2454 zap_cursor_retrieve(&zc, &za) == 0; 2455 zap_cursor_advance(&zc)) { 2456 dsl_dataset_t *cnds; 2457 uint64_t o; 2458 2459 if (za.za_first_integer == oldnext_obj) { 2460 /* 2461 * We've already moved the 2462 * origin's reference. 2463 */ 2464 continue; 2465 } 2466 2467 VERIFY0(dsl_dataset_hold_obj(dp, 2468 za.za_first_integer, FTAG, &cnds)); 2469 o = dsl_dir_phys(cnds->ds_dir)-> 2470 dd_head_dataset_obj; 2471 2472 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2473 dsl_dir_phys(odd)->dd_clones, o, tx)); 2474 VERIFY0(zap_add_int(dp->dp_meta_objset, 2475 dsl_dir_phys(dd)->dd_clones, o, tx)); 2476 dsl_dataset_rele(cnds, FTAG); 2477 } 2478 zap_cursor_fini(&zc); 2479 } 2480 2481 ASSERT(!dsl_prop_hascb(ds)); 2482 } 2483 2484#if defined(__FreeBSD__) && defined(_KERNEL) 2485 mutex_exit(&spa_namespace_lock); 2486 2487 kmem_free(newname, MAXPATHLEN); 2488 kmem_free(oldname, MAXPATHLEN); 2489#endif 2490 /* 2491 * Change space accounting. 2492 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2493 * both be valid, or both be 0 (resulting in delta == 0). This 2494 * is true for each of {clone,origin} independently. 2495 */ 2496 2497 delta = ddpa->cloneusedsnap - 2498 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2499 ASSERT3S(delta, >=, 0); 2500 ASSERT3U(ddpa->used, >=, delta); 2501 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2502 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2503 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2504 2505 delta = ddpa->originusedsnap - 2506 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2507 ASSERT3S(delta, <=, 0); 2508 ASSERT3U(ddpa->used, >=, -delta); 2509 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2510 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2511 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2512 2513 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2514 2515 /* log history record */ 2516 spa_history_log_internal_ds(hds, "promote", tx, ""); 2517 2518 dsl_dir_rele(odd, FTAG); 2519 promote_rele(ddpa, FTAG); 2520} 2521 2522/* 2523 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2524 * (exclusive) and last_obj (inclusive). The list will be in reverse 2525 * order (last_obj will be the list_head()). If first_obj == 0, do all 2526 * snapshots back to this dataset's origin. 2527 */ 2528static int 2529snaplist_make(dsl_pool_t *dp, 2530 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2531{ 2532 uint64_t obj = last_obj; 2533 2534 list_create(l, sizeof (struct promotenode), 2535 offsetof(struct promotenode, link)); 2536 2537 while (obj != first_obj) { 2538 dsl_dataset_t *ds; 2539 struct promotenode *snap; 2540 int err; 2541 2542 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2543 ASSERT(err != ENOENT); 2544 if (err != 0) 2545 return (err); 2546 2547 if (first_obj == 0) 2548 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2549 2550 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2551 snap->ds = ds; 2552 list_insert_tail(l, snap); 2553 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2554 } 2555 2556 return (0); 2557} 2558 2559static int 2560snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2561{ 2562 struct promotenode *snap; 2563 2564 *spacep = 0; 2565 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2566 uint64_t used, comp, uncomp; 2567 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2568 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2569 *spacep += used; 2570 } 2571 return (0); 2572} 2573 2574static void 2575snaplist_destroy(list_t *l, void *tag) 2576{ 2577 struct promotenode *snap; 2578 2579 if (l == NULL || !list_link_active(&l->list_head)) 2580 return; 2581 2582 while ((snap = list_tail(l)) != NULL) { 2583 list_remove(l, snap); 2584 dsl_dataset_rele(snap->ds, tag); 2585 kmem_free(snap, sizeof (*snap)); 2586 } 2587 list_destroy(l); 2588} 2589 2590static int 2591promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2592{ 2593 int error; 2594 dsl_dir_t *dd; 2595 struct promotenode *snap; 2596 2597 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2598 &ddpa->ddpa_clone); 2599 if (error != 0) 2600 return (error); 2601 dd = ddpa->ddpa_clone->ds_dir; 2602 2603 if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) || 2604 !dsl_dir_is_clone(dd)) { 2605 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2606 return (SET_ERROR(EINVAL)); 2607 } 2608 2609 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2610 &ddpa->shared_snaps, tag); 2611 if (error != 0) 2612 goto out; 2613 2614 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2615 &ddpa->clone_snaps, tag); 2616 if (error != 0) 2617 goto out; 2618 2619 snap = list_head(&ddpa->shared_snaps); 2620 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2621 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2622 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2623 &ddpa->origin_snaps, tag); 2624 if (error != 0) 2625 goto out; 2626 2627 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2628 error = dsl_dataset_hold_obj(dp, 2629 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2630 tag, &ddpa->origin_origin); 2631 if (error != 0) 2632 goto out; 2633 } 2634out: 2635 if (error != 0) 2636 promote_rele(ddpa, tag); 2637 return (error); 2638} 2639 2640static void 2641promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2642{ 2643 snaplist_destroy(&ddpa->shared_snaps, tag); 2644 snaplist_destroy(&ddpa->clone_snaps, tag); 2645 snaplist_destroy(&ddpa->origin_snaps, tag); 2646 if (ddpa->origin_origin != NULL) 2647 dsl_dataset_rele(ddpa->origin_origin, tag); 2648 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2649} 2650 2651/* 2652 * Promote a clone. 2653 * 2654 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2655 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2656 */ 2657int 2658dsl_dataset_promote(const char *name, char *conflsnap) 2659{ 2660 dsl_dataset_promote_arg_t ddpa = { 0 }; 2661 uint64_t numsnaps; 2662 int error; 2663 objset_t *os; 2664 2665 /* 2666 * We will modify space proportional to the number of 2667 * snapshots. Compute numsnaps. 2668 */ 2669 error = dmu_objset_hold(name, FTAG, &os); 2670 if (error != 0) 2671 return (error); 2672 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2673 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2674 &numsnaps); 2675 dmu_objset_rele(os, FTAG); 2676 if (error != 0) 2677 return (error); 2678 2679 ddpa.ddpa_clonename = name; 2680 ddpa.err_ds = conflsnap; 2681 ddpa.cr = CRED(); 2682 2683 return (dsl_sync_task(name, dsl_dataset_promote_check, 2684 dsl_dataset_promote_sync, &ddpa, 2685 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2686} 2687 2688int 2689dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2690 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2691{ 2692 int64_t unused_refres_delta; 2693 2694 /* they should both be heads */ 2695 if (dsl_dataset_is_snapshot(clone) || 2696 dsl_dataset_is_snapshot(origin_head)) 2697 return (SET_ERROR(EINVAL)); 2698 2699 /* if we are not forcing, the branch point should be just before them */ 2700 if (!force && clone->ds_prev != origin_head->ds_prev) 2701 return (SET_ERROR(EINVAL)); 2702 2703 /* clone should be the clone (unless they are unrelated) */ 2704 if (clone->ds_prev != NULL && 2705 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2706 origin_head->ds_dir != clone->ds_prev->ds_dir) 2707 return (SET_ERROR(EINVAL)); 2708 2709 /* the clone should be a child of the origin */ 2710 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2711 return (SET_ERROR(EINVAL)); 2712 2713 /* origin_head shouldn't be modified unless 'force' */ 2714 if (!force && 2715 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2716 return (SET_ERROR(ETXTBSY)); 2717 2718 /* origin_head should have no long holds (e.g. is not mounted) */ 2719 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2720 return (SET_ERROR(EBUSY)); 2721 2722 /* check amount of any unconsumed refreservation */ 2723 unused_refres_delta = 2724 (int64_t)MIN(origin_head->ds_reserved, 2725 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2726 (int64_t)MIN(origin_head->ds_reserved, 2727 dsl_dataset_phys(clone)->ds_unique_bytes); 2728 2729 if (unused_refres_delta > 0 && 2730 unused_refres_delta > 2731 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2732 return (SET_ERROR(ENOSPC)); 2733 2734 /* clone can't be over the head's refquota */ 2735 if (origin_head->ds_quota != 0 && 2736 dsl_dataset_phys(clone)->ds_referenced_bytes > 2737 origin_head->ds_quota) 2738 return (SET_ERROR(EDQUOT)); 2739 2740 return (0); 2741} 2742 2743void 2744dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2745 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2746{ 2747 dsl_pool_t *dp = dmu_tx_pool(tx); 2748 int64_t unused_refres_delta; 2749 2750 ASSERT(clone->ds_reserved == 0); 2751 ASSERT(origin_head->ds_quota == 0 || 2752 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); 2753 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2754 2755 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2756 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2757 2758 if (clone->ds_objset != NULL) { 2759 dmu_objset_evict(clone->ds_objset); 2760 clone->ds_objset = NULL; 2761 } 2762 2763 if (origin_head->ds_objset != NULL) { 2764 dmu_objset_evict(origin_head->ds_objset); 2765 origin_head->ds_objset = NULL; 2766 } 2767 2768 unused_refres_delta = 2769 (int64_t)MIN(origin_head->ds_reserved, 2770 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2771 (int64_t)MIN(origin_head->ds_reserved, 2772 dsl_dataset_phys(clone)->ds_unique_bytes); 2773 2774 /* 2775 * Reset origin's unique bytes, if it exists. 2776 */ 2777 if (clone->ds_prev) { 2778 dsl_dataset_t *origin = clone->ds_prev; 2779 uint64_t comp, uncomp; 2780 2781 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2782 dsl_deadlist_space_range(&clone->ds_deadlist, 2783 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 2784 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 2785 } 2786 2787 /* swap blkptrs */ 2788 { 2789 blkptr_t tmp; 2790 tmp = dsl_dataset_phys(origin_head)->ds_bp; 2791 dsl_dataset_phys(origin_head)->ds_bp = 2792 dsl_dataset_phys(clone)->ds_bp; 2793 dsl_dataset_phys(clone)->ds_bp = tmp; 2794 } 2795 2796 /* set dd_*_bytes */ 2797 { 2798 int64_t dused, dcomp, duncomp; 2799 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2800 uint64_t odl_used, odl_comp, odl_uncomp; 2801 2802 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 2803 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2804 2805 dsl_deadlist_space(&clone->ds_deadlist, 2806 &cdl_used, &cdl_comp, &cdl_uncomp); 2807 dsl_deadlist_space(&origin_head->ds_deadlist, 2808 &odl_used, &odl_comp, &odl_uncomp); 2809 2810 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 2811 cdl_used - 2812 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 2813 odl_used); 2814 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 2815 cdl_comp - 2816 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 2817 odl_comp); 2818 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 2819 cdl_uncomp - 2820 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 2821 odl_uncomp); 2822 2823 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2824 dused, dcomp, duncomp, tx); 2825 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2826 -dused, -dcomp, -duncomp, tx); 2827 2828 /* 2829 * The difference in the space used by snapshots is the 2830 * difference in snapshot space due to the head's 2831 * deadlist (since that's the only thing that's 2832 * changing that affects the snapused). 2833 */ 2834 dsl_deadlist_space_range(&clone->ds_deadlist, 2835 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2836 &cdl_used, &cdl_comp, &cdl_uncomp); 2837 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2838 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2839 &odl_used, &odl_comp, &odl_uncomp); 2840 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2841 DD_USED_HEAD, DD_USED_SNAP, NULL); 2842 } 2843 2844 /* swap ds_*_bytes */ 2845 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 2846 dsl_dataset_phys(clone)->ds_referenced_bytes); 2847 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 2848 dsl_dataset_phys(clone)->ds_compressed_bytes); 2849 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 2850 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 2851 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 2852 dsl_dataset_phys(clone)->ds_unique_bytes); 2853 2854 /* apply any parent delta for change in unconsumed refreservation */ 2855 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 2856 unused_refres_delta, 0, 0, tx); 2857 2858 /* 2859 * Swap deadlists. 2860 */ 2861 dsl_deadlist_close(&clone->ds_deadlist); 2862 dsl_deadlist_close(&origin_head->ds_deadlist); 2863 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 2864 dsl_dataset_phys(clone)->ds_deadlist_obj); 2865 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 2866 dsl_dataset_phys(clone)->ds_deadlist_obj); 2867 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 2868 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 2869 2870 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 2871 2872 spa_history_log_internal_ds(clone, "clone swap", tx, 2873 "parent=%s", origin_head->ds_dir->dd_myname); 2874} 2875 2876/* 2877 * Given a pool name and a dataset object number in that pool, 2878 * return the name of that dataset. 2879 */ 2880int 2881dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2882{ 2883 dsl_pool_t *dp; 2884 dsl_dataset_t *ds; 2885 int error; 2886 2887 error = dsl_pool_hold(pname, FTAG, &dp); 2888 if (error != 0) 2889 return (error); 2890 2891 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 2892 if (error == 0) { 2893 dsl_dataset_name(ds, buf); 2894 dsl_dataset_rele(ds, FTAG); 2895 } 2896 dsl_pool_rele(dp, FTAG); 2897 2898 return (error); 2899} 2900 2901int 2902dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2903 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2904{ 2905 int error = 0; 2906 2907 ASSERT3S(asize, >, 0); 2908 2909 /* 2910 * *ref_rsrv is the portion of asize that will come from any 2911 * unconsumed refreservation space. 2912 */ 2913 *ref_rsrv = 0; 2914 2915 mutex_enter(&ds->ds_lock); 2916 /* 2917 * Make a space adjustment for reserved bytes. 2918 */ 2919 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 2920 ASSERT3U(*used, >=, 2921 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 2922 *used -= 2923 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 2924 *ref_rsrv = 2925 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2926 } 2927 2928 if (!check_quota || ds->ds_quota == 0) { 2929 mutex_exit(&ds->ds_lock); 2930 return (0); 2931 } 2932 /* 2933 * If they are requesting more space, and our current estimate 2934 * is over quota, they get to try again unless the actual 2935 * on-disk is over quota and there are no pending changes (which 2936 * may free up space for us). 2937 */ 2938 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 2939 ds->ds_quota) { 2940 if (inflight > 0 || 2941 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 2942 error = SET_ERROR(ERESTART); 2943 else 2944 error = SET_ERROR(EDQUOT); 2945 } 2946 mutex_exit(&ds->ds_lock); 2947 2948 return (error); 2949} 2950 2951typedef struct dsl_dataset_set_qr_arg { 2952 const char *ddsqra_name; 2953 zprop_source_t ddsqra_source; 2954 uint64_t ddsqra_value; 2955} dsl_dataset_set_qr_arg_t; 2956 2957 2958/* ARGSUSED */ 2959static int 2960dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 2961{ 2962 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2963 dsl_pool_t *dp = dmu_tx_pool(tx); 2964 dsl_dataset_t *ds; 2965 int error; 2966 uint64_t newval; 2967 2968 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 2969 return (SET_ERROR(ENOTSUP)); 2970 2971 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2972 if (error != 0) 2973 return (error); 2974 2975 if (dsl_dataset_is_snapshot(ds)) { 2976 dsl_dataset_rele(ds, FTAG); 2977 return (SET_ERROR(EINVAL)); 2978 } 2979 2980 error = dsl_prop_predict(ds->ds_dir, 2981 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2982 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2983 if (error != 0) { 2984 dsl_dataset_rele(ds, FTAG); 2985 return (error); 2986 } 2987 2988 if (newval == 0) { 2989 dsl_dataset_rele(ds, FTAG); 2990 return (0); 2991 } 2992 2993 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 2994 newval < ds->ds_reserved) { 2995 dsl_dataset_rele(ds, FTAG); 2996 return (SET_ERROR(ENOSPC)); 2997 } 2998 2999 dsl_dataset_rele(ds, FTAG); 3000 return (0); 3001} 3002 3003static void 3004dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3005{ 3006 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3007 dsl_pool_t *dp = dmu_tx_pool(tx); 3008 dsl_dataset_t *ds; 3009 uint64_t newval; 3010 3011 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3012 3013 dsl_prop_set_sync_impl(ds, 3014 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3015 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3016 &ddsqra->ddsqra_value, tx); 3017 3018 VERIFY0(dsl_prop_get_int_ds(ds, 3019 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3020 3021 if (ds->ds_quota != newval) { 3022 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3023 ds->ds_quota = newval; 3024 } 3025 dsl_dataset_rele(ds, FTAG); 3026} 3027 3028int 3029dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3030 uint64_t refquota) 3031{ 3032 dsl_dataset_set_qr_arg_t ddsqra; 3033 3034 ddsqra.ddsqra_name = dsname; 3035 ddsqra.ddsqra_source = source; 3036 ddsqra.ddsqra_value = refquota; 3037 3038 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3039 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3040} 3041 3042static int 3043dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3044{ 3045 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3046 dsl_pool_t *dp = dmu_tx_pool(tx); 3047 dsl_dataset_t *ds; 3048 int error; 3049 uint64_t newval, unique; 3050 3051 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3052 return (SET_ERROR(ENOTSUP)); 3053 3054 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3055 if (error != 0) 3056 return (error); 3057 3058 if (dsl_dataset_is_snapshot(ds)) { 3059 dsl_dataset_rele(ds, FTAG); 3060 return (SET_ERROR(EINVAL)); 3061 } 3062 3063 error = dsl_prop_predict(ds->ds_dir, 3064 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3065 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3066 if (error != 0) { 3067 dsl_dataset_rele(ds, FTAG); 3068 return (error); 3069 } 3070 3071 /* 3072 * If we are doing the preliminary check in open context, the 3073 * space estimates may be inaccurate. 3074 */ 3075 if (!dmu_tx_is_syncing(tx)) { 3076 dsl_dataset_rele(ds, FTAG); 3077 return (0); 3078 } 3079 3080 mutex_enter(&ds->ds_lock); 3081 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3082 dsl_dataset_recalc_head_uniq(ds); 3083 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3084 mutex_exit(&ds->ds_lock); 3085 3086 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3087 uint64_t delta = MAX(unique, newval) - 3088 MAX(unique, ds->ds_reserved); 3089 3090 if (delta > 3091 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3092 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3093 dsl_dataset_rele(ds, FTAG); 3094 return (SET_ERROR(ENOSPC)); 3095 } 3096 } 3097 3098 dsl_dataset_rele(ds, FTAG); 3099 return (0); 3100} 3101 3102void 3103dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3104 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3105{ 3106 uint64_t newval; 3107 uint64_t unique; 3108 int64_t delta; 3109 3110 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3111 source, sizeof (value), 1, &value, tx); 3112 3113 VERIFY0(dsl_prop_get_int_ds(ds, 3114 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3115 3116 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3117 mutex_enter(&ds->ds_dir->dd_lock); 3118 mutex_enter(&ds->ds_lock); 3119 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3120 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3121 delta = MAX(0, (int64_t)(newval - unique)) - 3122 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3123 ds->ds_reserved = newval; 3124 mutex_exit(&ds->ds_lock); 3125 3126 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3127 mutex_exit(&ds->ds_dir->dd_lock); 3128} 3129 3130static void 3131dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3132{ 3133 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3134 dsl_pool_t *dp = dmu_tx_pool(tx); 3135 dsl_dataset_t *ds; 3136 3137 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3138 dsl_dataset_set_refreservation_sync_impl(ds, 3139 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3140 dsl_dataset_rele(ds, FTAG); 3141} 3142 3143int 3144dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3145 uint64_t refreservation) 3146{ 3147 dsl_dataset_set_qr_arg_t ddsqra; 3148 3149 ddsqra.ddsqra_name = dsname; 3150 ddsqra.ddsqra_source = source; 3151 ddsqra.ddsqra_value = refreservation; 3152 3153 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3154 dsl_dataset_set_refreservation_sync, &ddsqra, 3155 0, ZFS_SPACE_CHECK_NONE)); 3156} 3157 3158/* 3159 * Return (in *usedp) the amount of space written in new that is not 3160 * present in oldsnap. New may be a snapshot or the head. Old must be 3161 * a snapshot before new, in new's filesystem (or its origin). If not then 3162 * fail and return EINVAL. 3163 * 3164 * The written space is calculated by considering two components: First, we 3165 * ignore any freed space, and calculate the written as new's used space 3166 * minus old's used space. Next, we add in the amount of space that was freed 3167 * between the two snapshots, thus reducing new's used space relative to old's. 3168 * Specifically, this is the space that was born before old->ds_creation_txg, 3169 * and freed before new (ie. on new's deadlist or a previous deadlist). 3170 * 3171 * space freed [---------------------] 3172 * snapshots ---O-------O--------O-------O------ 3173 * oldsnap new 3174 */ 3175int 3176dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3177 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3178{ 3179 int err = 0; 3180 uint64_t snapobj; 3181 dsl_pool_t *dp = new->ds_dir->dd_pool; 3182 3183 ASSERT(dsl_pool_config_held(dp)); 3184 3185 *usedp = 0; 3186 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3187 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3188 3189 *compp = 0; 3190 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3191 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3192 3193 *uncompp = 0; 3194 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3195 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3196 3197 snapobj = new->ds_object; 3198 while (snapobj != oldsnap->ds_object) { 3199 dsl_dataset_t *snap; 3200 uint64_t used, comp, uncomp; 3201 3202 if (snapobj == new->ds_object) { 3203 snap = new; 3204 } else { 3205 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3206 if (err != 0) 3207 break; 3208 } 3209 3210 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3211 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3212 /* 3213 * The blocks in the deadlist can not be born after 3214 * ds_prev_snap_txg, so get the whole deadlist space, 3215 * which is more efficient (especially for old-format 3216 * deadlists). Unfortunately the deadlist code 3217 * doesn't have enough information to make this 3218 * optimization itself. 3219 */ 3220 dsl_deadlist_space(&snap->ds_deadlist, 3221 &used, &comp, &uncomp); 3222 } else { 3223 dsl_deadlist_space_range(&snap->ds_deadlist, 3224 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3225 &used, &comp, &uncomp); 3226 } 3227 *usedp += used; 3228 *compp += comp; 3229 *uncompp += uncomp; 3230 3231 /* 3232 * If we get to the beginning of the chain of snapshots 3233 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3234 * was not a snapshot of/before new. 3235 */ 3236 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3237 if (snap != new) 3238 dsl_dataset_rele(snap, FTAG); 3239 if (snapobj == 0) { 3240 err = SET_ERROR(EINVAL); 3241 break; 3242 } 3243 3244 } 3245 return (err); 3246} 3247 3248/* 3249 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3250 * lastsnap, and all snapshots in between are deleted. 3251 * 3252 * blocks that would be freed [---------------------------] 3253 * snapshots ---O-------O--------O-------O--------O 3254 * firstsnap lastsnap 3255 * 3256 * This is the set of blocks that were born after the snap before firstsnap, 3257 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3258 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3259 * We calculate this by iterating over the relevant deadlists (from the snap 3260 * after lastsnap, backward to the snap after firstsnap), summing up the 3261 * space on the deadlist that was born after the snap before firstsnap. 3262 */ 3263int 3264dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3265 dsl_dataset_t *lastsnap, 3266 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3267{ 3268 int err = 0; 3269 uint64_t snapobj; 3270 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3271 3272 ASSERT(dsl_dataset_is_snapshot(firstsnap)); 3273 ASSERT(dsl_dataset_is_snapshot(lastsnap)); 3274 3275 /* 3276 * Check that the snapshots are in the same dsl_dir, and firstsnap 3277 * is before lastsnap. 3278 */ 3279 if (firstsnap->ds_dir != lastsnap->ds_dir || 3280 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3281 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3282 return (SET_ERROR(EINVAL)); 3283 3284 *usedp = *compp = *uncompp = 0; 3285 3286 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3287 while (snapobj != firstsnap->ds_object) { 3288 dsl_dataset_t *ds; 3289 uint64_t used, comp, uncomp; 3290 3291 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3292 if (err != 0) 3293 break; 3294 3295 dsl_deadlist_space_range(&ds->ds_deadlist, 3296 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3297 &used, &comp, &uncomp); 3298 *usedp += used; 3299 *compp += comp; 3300 *uncompp += uncomp; 3301 3302 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3303 ASSERT3U(snapobj, !=, 0); 3304 dsl_dataset_rele(ds, FTAG); 3305 } 3306 return (err); 3307} 3308 3309static int 3310dsl_dataset_activate_large_blocks_check(void *arg, dmu_tx_t *tx) 3311{ 3312 const char *dsname = arg; 3313 dsl_dataset_t *ds; 3314 dsl_pool_t *dp = dmu_tx_pool(tx); 3315 int error = 0; 3316 3317 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS)) 3318 return (SET_ERROR(ENOTSUP)); 3319 3320 ASSERT(spa_feature_is_enabled(dp->dp_spa, 3321 SPA_FEATURE_EXTENSIBLE_DATASET)); 3322 3323 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 3324 if (error != 0) 3325 return (error); 3326 3327 if (ds->ds_large_blocks) 3328 error = EALREADY; 3329 dsl_dataset_rele(ds, FTAG); 3330 3331 return (error); 3332} 3333 3334void 3335dsl_dataset_activate_large_blocks_sync_impl(uint64_t dsobj, dmu_tx_t *tx) 3336{ 3337 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 3338 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 3339 uint64_t zero = 0; 3340 3341 spa_feature_incr(spa, SPA_FEATURE_LARGE_BLOCKS, tx); 3342 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 3343 3344 VERIFY0(zap_add(mos, dsobj, DS_FIELD_LARGE_BLOCKS, 3345 sizeof (zero), 1, &zero, tx)); 3346} 3347 3348static void 3349dsl_dataset_activate_large_blocks_sync(void *arg, dmu_tx_t *tx) 3350{ 3351 const char *dsname = arg; 3352 dsl_dataset_t *ds; 3353 3354 VERIFY0(dsl_dataset_hold(dmu_tx_pool(tx), dsname, FTAG, &ds)); 3355 3356 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); 3357 ASSERT(!ds->ds_large_blocks); 3358 ds->ds_large_blocks = B_TRUE; 3359 dsl_dataset_rele(ds, FTAG); 3360} 3361 3362int 3363dsl_dataset_activate_large_blocks(const char *dsname) 3364{ 3365 int error; 3366 3367 error = dsl_sync_task(dsname, 3368 dsl_dataset_activate_large_blocks_check, 3369 dsl_dataset_activate_large_blocks_sync, (void *)dsname, 3370 1, ZFS_SPACE_CHECK_RESERVED); 3371 3372 /* 3373 * EALREADY indicates that this dataset already supports large blocks. 3374 */ 3375 if (error == EALREADY) 3376 error = 0; 3377 return (error); 3378} 3379 3380/* 3381 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3382 * For example, they could both be snapshots of the same filesystem, and 3383 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3384 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3385 * filesystem. Or 'earlier' could be the origin's origin. 3386 * 3387 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3388 */ 3389boolean_t 3390dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3391 uint64_t earlier_txg) 3392{ 3393 dsl_pool_t *dp = later->ds_dir->dd_pool; 3394 int error; 3395 boolean_t ret; 3396 3397 ASSERT(dsl_pool_config_held(dp)); 3398 ASSERT(dsl_dataset_is_snapshot(earlier) || earlier_txg != 0); 3399 3400 if (earlier_txg == 0) 3401 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3402 3403 if (dsl_dataset_is_snapshot(later) && 3404 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3405 return (B_FALSE); 3406 3407 if (later->ds_dir == earlier->ds_dir) 3408 return (B_TRUE); 3409 if (!dsl_dir_is_clone(later->ds_dir)) 3410 return (B_FALSE); 3411 3412 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3413 return (B_TRUE); 3414 dsl_dataset_t *origin; 3415 error = dsl_dataset_hold_obj(dp, 3416 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3417 if (error != 0) 3418 return (B_FALSE); 3419 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3420 dsl_dataset_rele(origin, FTAG); 3421 return (ret); 3422} 3423 3424 3425void 3426dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3427{ 3428 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3429 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3430} 3431