dsl_dataset.c revision 263390
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org> 24 * Copyright (c) 2013 by Delphix. All rights reserved. 25 * Copyright (c) 2012, 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 53#define SWITCH64(x, y) \ 54 { \ 55 uint64_t __tmp = (x); \ 56 (x) = (y); \ 57 (y) = __tmp; \ 58 } 59 60#define DS_REF_MAX (1ULL << 62) 61 62#define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 63 64/* 65 * Figure out how much of this delta should be propogated to the dsl_dir 66 * layer. If there's a refreservation, that space has already been 67 * partially accounted for in our ancestors. 68 */ 69static int64_t 70parent_delta(dsl_dataset_t *ds, int64_t delta) 71{ 72 uint64_t old_bytes, new_bytes; 73 74 if (ds->ds_reserved == 0) 75 return (delta); 76 77 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 78 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 79 80 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 81 return (new_bytes - old_bytes); 82} 83 84void 85dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 86{ 87 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 88 int compressed = BP_GET_PSIZE(bp); 89 int uncompressed = BP_GET_UCSIZE(bp); 90 int64_t delta; 91 92 dprintf_bp(bp, "ds=%p", ds); 93 94 ASSERT(dmu_tx_is_syncing(tx)); 95 /* It could have been compressed away to nothing */ 96 if (BP_IS_HOLE(bp)) 97 return; 98 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 99 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 100 if (ds == NULL) { 101 dsl_pool_mos_diduse_space(tx->tx_pool, 102 used, compressed, uncompressed); 103 return; 104 } 105 106 dmu_buf_will_dirty(ds->ds_dbuf, tx); 107 mutex_enter(&ds->ds_lock); 108 delta = parent_delta(ds, used); 109 ds->ds_phys->ds_referenced_bytes += used; 110 ds->ds_phys->ds_compressed_bytes += compressed; 111 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 112 ds->ds_phys->ds_unique_bytes += used; 113 mutex_exit(&ds->ds_lock); 114 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 115 compressed, uncompressed, tx); 116 dsl_dir_transfer_space(ds->ds_dir, used - delta, 117 DD_USED_REFRSRV, DD_USED_HEAD, tx); 118} 119 120int 121dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 122 boolean_t async) 123{ 124 if (BP_IS_HOLE(bp)) 125 return (0); 126 127 ASSERT(dmu_tx_is_syncing(tx)); 128 ASSERT(bp->blk_birth <= tx->tx_txg); 129 130 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 131 int compressed = BP_GET_PSIZE(bp); 132 int uncompressed = BP_GET_UCSIZE(bp); 133 134 ASSERT(used > 0); 135 if (ds == NULL) { 136 dsl_free(tx->tx_pool, tx->tx_txg, bp); 137 dsl_pool_mos_diduse_space(tx->tx_pool, 138 -used, -compressed, -uncompressed); 139 return (used); 140 } 141 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 142 143 ASSERT(!dsl_dataset_is_snapshot(ds)); 144 dmu_buf_will_dirty(ds->ds_dbuf, tx); 145 146 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 147 int64_t delta; 148 149 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 150 dsl_free(tx->tx_pool, tx->tx_txg, bp); 151 152 mutex_enter(&ds->ds_lock); 153 ASSERT(ds->ds_phys->ds_unique_bytes >= used || 154 !DS_UNIQUE_IS_ACCURATE(ds)); 155 delta = parent_delta(ds, -used); 156 ds->ds_phys->ds_unique_bytes -= used; 157 mutex_exit(&ds->ds_lock); 158 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 159 delta, -compressed, -uncompressed, tx); 160 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 161 DD_USED_REFRSRV, DD_USED_HEAD, tx); 162 } else { 163 dprintf_bp(bp, "putting on dead list: %s", ""); 164 if (async) { 165 /* 166 * We are here as part of zio's write done callback, 167 * which means we're a zio interrupt thread. We can't 168 * call dsl_deadlist_insert() now because it may block 169 * waiting for I/O. Instead, put bp on the deferred 170 * queue and let dsl_pool_sync() finish the job. 171 */ 172 bplist_append(&ds->ds_pending_deadlist, bp); 173 } else { 174 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 175 } 176 ASSERT3U(ds->ds_prev->ds_object, ==, 177 ds->ds_phys->ds_prev_snap_obj); 178 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 179 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 180 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 181 ds->ds_object && bp->blk_birth > 182 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 183 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 184 mutex_enter(&ds->ds_prev->ds_lock); 185 ds->ds_prev->ds_phys->ds_unique_bytes += used; 186 mutex_exit(&ds->ds_prev->ds_lock); 187 } 188 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 189 dsl_dir_transfer_space(ds->ds_dir, used, 190 DD_USED_HEAD, DD_USED_SNAP, tx); 191 } 192 } 193 mutex_enter(&ds->ds_lock); 194 ASSERT3U(ds->ds_phys->ds_referenced_bytes, >=, used); 195 ds->ds_phys->ds_referenced_bytes -= used; 196 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 197 ds->ds_phys->ds_compressed_bytes -= compressed; 198 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 199 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 200 mutex_exit(&ds->ds_lock); 201 202 return (used); 203} 204 205uint64_t 206dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 207{ 208 uint64_t trysnap = 0; 209 210 if (ds == NULL) 211 return (0); 212 /* 213 * The snapshot creation could fail, but that would cause an 214 * incorrect FALSE return, which would only result in an 215 * overestimation of the amount of space that an operation would 216 * consume, which is OK. 217 * 218 * There's also a small window where we could miss a pending 219 * snapshot, because we could set the sync task in the quiescing 220 * phase. So this should only be used as a guess. 221 */ 222 if (ds->ds_trysnap_txg > 223 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 224 trysnap = ds->ds_trysnap_txg; 225 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 226} 227 228boolean_t 229dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 230 uint64_t blk_birth) 231{ 232 if (blk_birth <= dsl_dataset_prev_snap_txg(ds)) 233 return (B_FALSE); 234 235 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 236 237 return (B_TRUE); 238} 239 240/* ARGSUSED */ 241static void 242dsl_dataset_evict(dmu_buf_t *db, void *dsv) 243{ 244 dsl_dataset_t *ds = dsv; 245 246 ASSERT(ds->ds_owner == NULL); 247 248 unique_remove(ds->ds_fsid_guid); 249 250 if (ds->ds_objset != NULL) 251 dmu_objset_evict(ds->ds_objset); 252 253 if (ds->ds_prev) { 254 dsl_dataset_rele(ds->ds_prev, ds); 255 ds->ds_prev = NULL; 256 } 257 258 bplist_destroy(&ds->ds_pending_deadlist); 259 if (ds->ds_phys->ds_deadlist_obj != 0) 260 dsl_deadlist_close(&ds->ds_deadlist); 261 if (ds->ds_dir) 262 dsl_dir_rele(ds->ds_dir, ds); 263 264 ASSERT(!list_link_active(&ds->ds_synced_link)); 265 266 if (mutex_owned(&ds->ds_lock)) 267 mutex_exit(&ds->ds_lock); 268 mutex_destroy(&ds->ds_lock); 269 if (mutex_owned(&ds->ds_opening_lock)) 270 mutex_exit(&ds->ds_opening_lock); 271 mutex_destroy(&ds->ds_opening_lock); 272 refcount_destroy(&ds->ds_longholds); 273 274 kmem_free(ds, sizeof (dsl_dataset_t)); 275} 276 277int 278dsl_dataset_get_snapname(dsl_dataset_t *ds) 279{ 280 dsl_dataset_phys_t *headphys; 281 int err; 282 dmu_buf_t *headdbuf; 283 dsl_pool_t *dp = ds->ds_dir->dd_pool; 284 objset_t *mos = dp->dp_meta_objset; 285 286 if (ds->ds_snapname[0]) 287 return (0); 288 if (ds->ds_phys->ds_next_snap_obj == 0) 289 return (0); 290 291 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 292 FTAG, &headdbuf); 293 if (err != 0) 294 return (err); 295 headphys = headdbuf->db_data; 296 err = zap_value_search(dp->dp_meta_objset, 297 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 298 dmu_buf_rele(headdbuf, FTAG); 299 return (err); 300} 301 302int 303dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 304{ 305 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 306 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 307 matchtype_t mt; 308 int err; 309 310 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 311 mt = MT_FIRST; 312 else 313 mt = MT_EXACT; 314 315 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 316 value, mt, NULL, 0, NULL); 317 if (err == ENOTSUP && mt == MT_FIRST) 318 err = zap_lookup(mos, snapobj, name, 8, 1, value); 319 return (err); 320} 321 322int 323dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx) 324{ 325 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 326 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 327 matchtype_t mt; 328 int err; 329 330 dsl_dir_snap_cmtime_update(ds->ds_dir); 331 332 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 333 mt = MT_FIRST; 334 else 335 mt = MT_EXACT; 336 337 err = zap_remove_norm(mos, snapobj, name, mt, tx); 338 if (err == ENOTSUP && mt == MT_FIRST) 339 err = zap_remove(mos, snapobj, name, tx); 340 return (err); 341} 342 343int 344dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 345 dsl_dataset_t **dsp) 346{ 347 objset_t *mos = dp->dp_meta_objset; 348 dmu_buf_t *dbuf; 349 dsl_dataset_t *ds; 350 int err; 351 dmu_object_info_t doi; 352 353 ASSERT(dsl_pool_config_held(dp)); 354 355 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 356 if (err != 0) 357 return (err); 358 359 /* Make sure dsobj has the correct object type. */ 360 dmu_object_info_from_db(dbuf, &doi); 361 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 362 dmu_buf_rele(dbuf, tag); 363 return (SET_ERROR(EINVAL)); 364 } 365 366 ds = dmu_buf_get_user(dbuf); 367 if (ds == NULL) { 368 dsl_dataset_t *winner = NULL; 369 370 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 371 ds->ds_dbuf = dbuf; 372 ds->ds_object = dsobj; 373 ds->ds_phys = dbuf->db_data; 374 375 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 376 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 377 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 378 refcount_create(&ds->ds_longholds); 379 380 bplist_create(&ds->ds_pending_deadlist); 381 dsl_deadlist_open(&ds->ds_deadlist, 382 mos, ds->ds_phys->ds_deadlist_obj); 383 384 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 385 offsetof(dmu_sendarg_t, dsa_link)); 386 387 if (err == 0) { 388 err = dsl_dir_hold_obj(dp, 389 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 390 } 391 if (err != 0) { 392 mutex_destroy(&ds->ds_lock); 393 mutex_destroy(&ds->ds_opening_lock); 394 refcount_destroy(&ds->ds_longholds); 395 bplist_destroy(&ds->ds_pending_deadlist); 396 dsl_deadlist_close(&ds->ds_deadlist); 397 kmem_free(ds, sizeof (dsl_dataset_t)); 398 dmu_buf_rele(dbuf, tag); 399 return (err); 400 } 401 402 if (!dsl_dataset_is_snapshot(ds)) { 403 ds->ds_snapname[0] = '\0'; 404 if (ds->ds_phys->ds_prev_snap_obj != 0) { 405 err = dsl_dataset_hold_obj(dp, 406 ds->ds_phys->ds_prev_snap_obj, 407 ds, &ds->ds_prev); 408 } 409 } else { 410 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 411 err = dsl_dataset_get_snapname(ds); 412 if (err == 0 && ds->ds_phys->ds_userrefs_obj != 0) { 413 err = zap_count( 414 ds->ds_dir->dd_pool->dp_meta_objset, 415 ds->ds_phys->ds_userrefs_obj, 416 &ds->ds_userrefs); 417 } 418 } 419 420 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 421 err = dsl_prop_get_int_ds(ds, 422 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 423 &ds->ds_reserved); 424 if (err == 0) { 425 err = dsl_prop_get_int_ds(ds, 426 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 427 &ds->ds_quota); 428 } 429 } else { 430 ds->ds_reserved = ds->ds_quota = 0; 431 } 432 433 if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds, 434 &ds->ds_phys, dsl_dataset_evict)) != NULL) { 435 bplist_destroy(&ds->ds_pending_deadlist); 436 dsl_deadlist_close(&ds->ds_deadlist); 437 if (ds->ds_prev) 438 dsl_dataset_rele(ds->ds_prev, ds); 439 dsl_dir_rele(ds->ds_dir, ds); 440 mutex_destroy(&ds->ds_lock); 441 mutex_destroy(&ds->ds_opening_lock); 442 refcount_destroy(&ds->ds_longholds); 443 kmem_free(ds, sizeof (dsl_dataset_t)); 444 if (err != 0) { 445 dmu_buf_rele(dbuf, tag); 446 return (err); 447 } 448 ds = winner; 449 } else { 450 ds->ds_fsid_guid = 451 unique_insert(ds->ds_phys->ds_fsid_guid); 452 } 453 } 454 ASSERT3P(ds->ds_dbuf, ==, dbuf); 455 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 456 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || 457 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 458 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 459 *dsp = ds; 460 return (0); 461} 462 463int 464dsl_dataset_hold(dsl_pool_t *dp, const char *name, 465 void *tag, dsl_dataset_t **dsp) 466{ 467 dsl_dir_t *dd; 468 const char *snapname; 469 uint64_t obj; 470 int err = 0; 471 472 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 473 if (err != 0) 474 return (err); 475 476 ASSERT(dsl_pool_config_held(dp)); 477 obj = dd->dd_phys->dd_head_dataset_obj; 478 if (obj != 0) 479 err = dsl_dataset_hold_obj(dp, obj, tag, dsp); 480 else 481 err = SET_ERROR(ENOENT); 482 483 /* we may be looking for a snapshot */ 484 if (err == 0 && snapname != NULL) { 485 dsl_dataset_t *ds; 486 487 if (*snapname++ != '@') { 488 dsl_dataset_rele(*dsp, tag); 489 dsl_dir_rele(dd, FTAG); 490 return (SET_ERROR(ENOENT)); 491 } 492 493 dprintf("looking for snapshot '%s'\n", snapname); 494 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 495 if (err == 0) 496 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 497 dsl_dataset_rele(*dsp, tag); 498 499 if (err == 0) { 500 mutex_enter(&ds->ds_lock); 501 if (ds->ds_snapname[0] == 0) 502 (void) strlcpy(ds->ds_snapname, snapname, 503 sizeof (ds->ds_snapname)); 504 mutex_exit(&ds->ds_lock); 505 *dsp = ds; 506 } 507 } 508 509 dsl_dir_rele(dd, FTAG); 510 return (err); 511} 512 513int 514dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 515 void *tag, dsl_dataset_t **dsp) 516{ 517 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 518 if (err != 0) 519 return (err); 520 if (!dsl_dataset_tryown(*dsp, tag)) { 521 dsl_dataset_rele(*dsp, tag); 522 *dsp = NULL; 523 return (SET_ERROR(EBUSY)); 524 } 525 return (0); 526} 527 528int 529dsl_dataset_own(dsl_pool_t *dp, const char *name, 530 void *tag, dsl_dataset_t **dsp) 531{ 532 int err = dsl_dataset_hold(dp, name, tag, dsp); 533 if (err != 0) 534 return (err); 535 if (!dsl_dataset_tryown(*dsp, tag)) { 536 dsl_dataset_rele(*dsp, tag); 537 return (SET_ERROR(EBUSY)); 538 } 539 return (0); 540} 541 542/* 543 * See the comment above dsl_pool_hold() for details. In summary, a long 544 * hold is used to prevent destruction of a dataset while the pool hold 545 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 546 * 547 * The dataset and pool must be held when this function is called. After it 548 * is called, the pool hold may be released while the dataset is still held 549 * and accessed. 550 */ 551void 552dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 553{ 554 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 555 (void) refcount_add(&ds->ds_longholds, tag); 556} 557 558void 559dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 560{ 561 (void) refcount_remove(&ds->ds_longholds, tag); 562} 563 564/* Return B_TRUE if there are any long holds on this dataset. */ 565boolean_t 566dsl_dataset_long_held(dsl_dataset_t *ds) 567{ 568 return (!refcount_is_zero(&ds->ds_longholds)); 569} 570 571void 572dsl_dataset_name(dsl_dataset_t *ds, char *name) 573{ 574 if (ds == NULL) { 575 (void) strcpy(name, "mos"); 576 } else { 577 dsl_dir_name(ds->ds_dir, name); 578 VERIFY0(dsl_dataset_get_snapname(ds)); 579 if (ds->ds_snapname[0]) { 580 (void) strcat(name, "@"); 581 /* 582 * We use a "recursive" mutex so that we 583 * can call dprintf_ds() with ds_lock held. 584 */ 585 if (!MUTEX_HELD(&ds->ds_lock)) { 586 mutex_enter(&ds->ds_lock); 587 (void) strcat(name, ds->ds_snapname); 588 mutex_exit(&ds->ds_lock); 589 } else { 590 (void) strcat(name, ds->ds_snapname); 591 } 592 } 593 } 594} 595 596void 597dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 598{ 599 dmu_buf_rele(ds->ds_dbuf, tag); 600} 601 602void 603dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 604{ 605 ASSERT(ds->ds_owner == tag && ds->ds_dbuf != NULL); 606 607 mutex_enter(&ds->ds_lock); 608 ds->ds_owner = NULL; 609 mutex_exit(&ds->ds_lock); 610 dsl_dataset_long_rele(ds, tag); 611 if (ds->ds_dbuf != NULL) 612 dsl_dataset_rele(ds, tag); 613 else 614 dsl_dataset_evict(NULL, ds); 615} 616 617boolean_t 618dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 619{ 620 boolean_t gotit = FALSE; 621 622 mutex_enter(&ds->ds_lock); 623 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 624 ds->ds_owner = tag; 625 dsl_dataset_long_hold(ds, tag); 626 gotit = TRUE; 627 } 628 mutex_exit(&ds->ds_lock); 629 return (gotit); 630} 631 632uint64_t 633dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 634 uint64_t flags, dmu_tx_t *tx) 635{ 636 dsl_pool_t *dp = dd->dd_pool; 637 dmu_buf_t *dbuf; 638 dsl_dataset_phys_t *dsphys; 639 uint64_t dsobj; 640 objset_t *mos = dp->dp_meta_objset; 641 642 if (origin == NULL) 643 origin = dp->dp_origin_snap; 644 645 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 646 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 647 ASSERT(dmu_tx_is_syncing(tx)); 648 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 649 650 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 651 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 652 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 653 dmu_buf_will_dirty(dbuf, tx); 654 dsphys = dbuf->db_data; 655 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 656 dsphys->ds_dir_obj = dd->dd_object; 657 dsphys->ds_flags = flags; 658 dsphys->ds_fsid_guid = unique_create(); 659 do { 660 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 661 sizeof (dsphys->ds_guid)); 662 } while (dsphys->ds_guid == 0); 663 dsphys->ds_snapnames_zapobj = 664 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 665 DMU_OT_NONE, 0, tx); 666 dsphys->ds_creation_time = gethrestime_sec(); 667 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 668 669 if (origin == NULL) { 670 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 671 } else { 672 dsl_dataset_t *ohds; /* head of the origin snapshot */ 673 674 dsphys->ds_prev_snap_obj = origin->ds_object; 675 dsphys->ds_prev_snap_txg = 676 origin->ds_phys->ds_creation_txg; 677 dsphys->ds_referenced_bytes = 678 origin->ds_phys->ds_referenced_bytes; 679 dsphys->ds_compressed_bytes = 680 origin->ds_phys->ds_compressed_bytes; 681 dsphys->ds_uncompressed_bytes = 682 origin->ds_phys->ds_uncompressed_bytes; 683 dsphys->ds_bp = origin->ds_phys->ds_bp; 684 dsphys->ds_flags |= origin->ds_phys->ds_flags; 685 686 dmu_buf_will_dirty(origin->ds_dbuf, tx); 687 origin->ds_phys->ds_num_children++; 688 689 VERIFY0(dsl_dataset_hold_obj(dp, 690 origin->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ohds)); 691 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 692 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 693 dsl_dataset_rele(ohds, FTAG); 694 695 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 696 if (origin->ds_phys->ds_next_clones_obj == 0) { 697 origin->ds_phys->ds_next_clones_obj = 698 zap_create(mos, 699 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 700 } 701 VERIFY0(zap_add_int(mos, 702 origin->ds_phys->ds_next_clones_obj, dsobj, tx)); 703 } 704 705 dmu_buf_will_dirty(dd->dd_dbuf, tx); 706 dd->dd_phys->dd_origin_obj = origin->ds_object; 707 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 708 if (origin->ds_dir->dd_phys->dd_clones == 0) { 709 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 710 origin->ds_dir->dd_phys->dd_clones = 711 zap_create(mos, 712 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 713 } 714 VERIFY0(zap_add_int(mos, 715 origin->ds_dir->dd_phys->dd_clones, dsobj, tx)); 716 } 717 } 718 719 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 720 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 721 722 dmu_buf_rele(dbuf, FTAG); 723 724 dmu_buf_will_dirty(dd->dd_dbuf, tx); 725 dd->dd_phys->dd_head_dataset_obj = dsobj; 726 727 return (dsobj); 728} 729 730static void 731dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 732{ 733 objset_t *os; 734 735 VERIFY0(dmu_objset_from_ds(ds, &os)); 736 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 737 dsl_dataset_dirty(ds, tx); 738} 739 740uint64_t 741dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 742 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 743{ 744 dsl_pool_t *dp = pdd->dd_pool; 745 uint64_t dsobj, ddobj; 746 dsl_dir_t *dd; 747 748 ASSERT(dmu_tx_is_syncing(tx)); 749 ASSERT(lastname[0] != '@'); 750 751 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 752 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 753 754 dsobj = dsl_dataset_create_sync_dd(dd, origin, 755 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 756 757 dsl_deleg_set_create_perms(dd, tx, cr); 758 759 dsl_dir_rele(dd, FTAG); 760 761 /* 762 * If we are creating a clone, make sure we zero out any stale 763 * data from the origin snapshots zil header. 764 */ 765 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 766 dsl_dataset_t *ds; 767 768 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 769 dsl_dataset_zero_zil(ds, tx); 770 dsl_dataset_rele(ds, FTAG); 771 } 772 773 return (dsobj); 774} 775 776#ifdef __FreeBSD__ 777/* FreeBSD ioctl compat begin */ 778struct destroyarg { 779 nvlist_t *nvl; 780 const char *snapname; 781}; 782 783static int 784dsl_check_snap_cb(const char *name, void *arg) 785{ 786 struct destroyarg *da = arg; 787 dsl_dataset_t *ds; 788 char *dsname; 789 790 dsname = kmem_asprintf("%s@%s", name, da->snapname); 791 fnvlist_add_boolean(da->nvl, dsname); 792 kmem_free(dsname, strlen(dsname) + 1); 793 794 return (0); 795} 796 797int 798dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 799 nvlist_t *snaps) 800{ 801 struct destroyarg *da; 802 int err; 803 804 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 805 da->nvl = snaps; 806 da->snapname = snapname; 807 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 808 DS_FIND_CHILDREN); 809 kmem_free(da, sizeof (struct destroyarg)); 810 811 return (err); 812} 813/* FreeBSD ioctl compat end */ 814#endif /* __FreeBSD__ */ 815 816/* 817 * The unique space in the head dataset can be calculated by subtracting 818 * the space used in the most recent snapshot, that is still being used 819 * in this file system, from the space currently in use. To figure out 820 * the space in the most recent snapshot still in use, we need to take 821 * the total space used in the snapshot and subtract out the space that 822 * has been freed up since the snapshot was taken. 823 */ 824void 825dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 826{ 827 uint64_t mrs_used; 828 uint64_t dlused, dlcomp, dluncomp; 829 830 ASSERT(!dsl_dataset_is_snapshot(ds)); 831 832 if (ds->ds_phys->ds_prev_snap_obj != 0) 833 mrs_used = ds->ds_prev->ds_phys->ds_referenced_bytes; 834 else 835 mrs_used = 0; 836 837 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 838 839 ASSERT3U(dlused, <=, mrs_used); 840 ds->ds_phys->ds_unique_bytes = 841 ds->ds_phys->ds_referenced_bytes - (mrs_used - dlused); 842 843 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 844 SPA_VERSION_UNIQUE_ACCURATE) 845 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 846} 847 848void 849dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 850 dmu_tx_t *tx) 851{ 852 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 853 uint64_t count; 854 int err; 855 856 ASSERT(ds->ds_phys->ds_num_children >= 2); 857 err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx); 858 /* 859 * The err should not be ENOENT, but a bug in a previous version 860 * of the code could cause upgrade_clones_cb() to not set 861 * ds_next_snap_obj when it should, leading to a missing entry. 862 * If we knew that the pool was created after 863 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 864 * ENOENT. However, at least we can check that we don't have 865 * too many entries in the next_clones_obj even after failing to 866 * remove this one. 867 */ 868 if (err != ENOENT) 869 VERIFY0(err); 870 ASSERT0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 871 &count)); 872 ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2); 873} 874 875 876blkptr_t * 877dsl_dataset_get_blkptr(dsl_dataset_t *ds) 878{ 879 return (&ds->ds_phys->ds_bp); 880} 881 882void 883dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 884{ 885 ASSERT(dmu_tx_is_syncing(tx)); 886 /* If it's the meta-objset, set dp_meta_rootbp */ 887 if (ds == NULL) { 888 tx->tx_pool->dp_meta_rootbp = *bp; 889 } else { 890 dmu_buf_will_dirty(ds->ds_dbuf, tx); 891 ds->ds_phys->ds_bp = *bp; 892 } 893} 894 895spa_t * 896dsl_dataset_get_spa(dsl_dataset_t *ds) 897{ 898 return (ds->ds_dir->dd_pool->dp_spa); 899} 900 901void 902dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 903{ 904 dsl_pool_t *dp; 905 906 if (ds == NULL) /* this is the meta-objset */ 907 return; 908 909 ASSERT(ds->ds_objset != NULL); 910 911 if (ds->ds_phys->ds_next_snap_obj != 0) 912 panic("dirtying snapshot!"); 913 914 dp = ds->ds_dir->dd_pool; 915 916 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 917 /* up the hold count until we can be written out */ 918 dmu_buf_add_ref(ds->ds_dbuf, ds); 919 } 920} 921 922boolean_t 923dsl_dataset_is_dirty(dsl_dataset_t *ds) 924{ 925 for (int t = 0; t < TXG_SIZE; t++) { 926 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 927 ds, t)) 928 return (B_TRUE); 929 } 930 return (B_FALSE); 931} 932 933static int 934dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 935{ 936 uint64_t asize; 937 938 if (!dmu_tx_is_syncing(tx)) 939 return (0); 940 941 /* 942 * If there's an fs-only reservation, any blocks that might become 943 * owned by the snapshot dataset must be accommodated by space 944 * outside of the reservation. 945 */ 946 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 947 asize = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 948 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 949 return (SET_ERROR(ENOSPC)); 950 951 /* 952 * Propagate any reserved space for this snapshot to other 953 * snapshot checks in this sync group. 954 */ 955 if (asize > 0) 956 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 957 958 return (0); 959} 960 961typedef struct dsl_dataset_snapshot_arg { 962 nvlist_t *ddsa_snaps; 963 nvlist_t *ddsa_props; 964 nvlist_t *ddsa_errors; 965} dsl_dataset_snapshot_arg_t; 966 967int 968dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 969 dmu_tx_t *tx, boolean_t recv) 970{ 971 int error; 972 uint64_t value; 973 974 ds->ds_trysnap_txg = tx->tx_txg; 975 976 if (!dmu_tx_is_syncing(tx)) 977 return (0); 978 979 /* 980 * We don't allow multiple snapshots of the same txg. If there 981 * is already one, try again. 982 */ 983 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 984 return (SET_ERROR(EAGAIN)); 985 986 /* 987 * Check for conflicting snapshot name. 988 */ 989 error = dsl_dataset_snap_lookup(ds, snapname, &value); 990 if (error == 0) 991 return (SET_ERROR(EEXIST)); 992 if (error != ENOENT) 993 return (error); 994 995 /* 996 * We don't allow taking snapshots of inconsistent datasets, such as 997 * those into which we are currently receiving. However, if we are 998 * creating this snapshot as part of a receive, this check will be 999 * executed atomically with respect to the completion of the receive 1000 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1001 * case we ignore this, knowing it will be fixed up for us shortly in 1002 * dmu_recv_end_sync(). 1003 */ 1004 if (!recv && DS_IS_INCONSISTENT(ds)) 1005 return (SET_ERROR(EBUSY)); 1006 1007 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1008 if (error != 0) 1009 return (error); 1010 1011 return (0); 1012} 1013 1014static int 1015dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1016{ 1017 dsl_dataset_snapshot_arg_t *ddsa = arg; 1018 dsl_pool_t *dp = dmu_tx_pool(tx); 1019 nvpair_t *pair; 1020 int rv = 0; 1021 1022 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1023 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1024 int error = 0; 1025 dsl_dataset_t *ds; 1026 char *name, *atp; 1027 char dsname[MAXNAMELEN]; 1028 1029 name = nvpair_name(pair); 1030 if (strlen(name) >= MAXNAMELEN) 1031 error = SET_ERROR(ENAMETOOLONG); 1032 if (error == 0) { 1033 atp = strchr(name, '@'); 1034 if (atp == NULL) 1035 error = SET_ERROR(EINVAL); 1036 if (error == 0) 1037 (void) strlcpy(dsname, name, atp - name + 1); 1038 } 1039 if (error == 0) 1040 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1041 if (error == 0) { 1042 error = dsl_dataset_snapshot_check_impl(ds, 1043 atp + 1, tx, B_FALSE); 1044 dsl_dataset_rele(ds, FTAG); 1045 } 1046 1047 if (error != 0) { 1048 if (ddsa->ddsa_errors != NULL) { 1049 fnvlist_add_int32(ddsa->ddsa_errors, 1050 name, error); 1051 } 1052 rv = error; 1053 } 1054 } 1055 return (rv); 1056} 1057 1058void 1059dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1060 dmu_tx_t *tx) 1061{ 1062 static zil_header_t zero_zil; 1063 1064 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1065 dmu_buf_t *dbuf; 1066 dsl_dataset_phys_t *dsphys; 1067 uint64_t dsobj, crtxg; 1068 objset_t *mos = dp->dp_meta_objset; 1069 objset_t *os; 1070 1071 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1072 1073 /* 1074 * If we are on an old pool, the zil must not be active, in which 1075 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1076 */ 1077 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1078 dmu_objset_from_ds(ds, &os) != 0 || 1079 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1080 sizeof (zero_zil)) == 0); 1081 1082 1083 /* 1084 * The origin's ds_creation_txg has to be < TXG_INITIAL 1085 */ 1086 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1087 crtxg = 1; 1088 else 1089 crtxg = tx->tx_txg; 1090 1091 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1092 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1093 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1094 dmu_buf_will_dirty(dbuf, tx); 1095 dsphys = dbuf->db_data; 1096 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1097 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1098 dsphys->ds_fsid_guid = unique_create(); 1099 do { 1100 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1101 sizeof (dsphys->ds_guid)); 1102 } while (dsphys->ds_guid == 0); 1103 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1104 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1105 dsphys->ds_next_snap_obj = ds->ds_object; 1106 dsphys->ds_num_children = 1; 1107 dsphys->ds_creation_time = gethrestime_sec(); 1108 dsphys->ds_creation_txg = crtxg; 1109 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1110 dsphys->ds_referenced_bytes = ds->ds_phys->ds_referenced_bytes; 1111 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1112 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1113 dsphys->ds_flags = ds->ds_phys->ds_flags; 1114 dsphys->ds_bp = ds->ds_phys->ds_bp; 1115 dmu_buf_rele(dbuf, FTAG); 1116 1117 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1118 if (ds->ds_prev) { 1119 uint64_t next_clones_obj = 1120 ds->ds_prev->ds_phys->ds_next_clones_obj; 1121 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1122 ds->ds_object || 1123 ds->ds_prev->ds_phys->ds_num_children > 1); 1124 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1125 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1126 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1127 ds->ds_prev->ds_phys->ds_creation_txg); 1128 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1129 } else if (next_clones_obj != 0) { 1130 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1131 dsphys->ds_next_snap_obj, tx); 1132 VERIFY0(zap_add_int(mos, 1133 next_clones_obj, dsobj, tx)); 1134 } 1135 } 1136 1137 /* 1138 * If we have a reference-reservation on this dataset, we will 1139 * need to increase the amount of refreservation being charged 1140 * since our unique space is going to zero. 1141 */ 1142 if (ds->ds_reserved) { 1143 int64_t delta; 1144 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1145 delta = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 1146 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1147 delta, 0, 0, tx); 1148 } 1149 1150 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1151 ds->ds_phys->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist, 1152 UINT64_MAX, ds->ds_phys->ds_prev_snap_obj, tx); 1153 dsl_deadlist_close(&ds->ds_deadlist); 1154 dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj); 1155 dsl_deadlist_add_key(&ds->ds_deadlist, 1156 ds->ds_phys->ds_prev_snap_txg, tx); 1157 1158 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1159 ds->ds_phys->ds_prev_snap_obj = dsobj; 1160 ds->ds_phys->ds_prev_snap_txg = crtxg; 1161 ds->ds_phys->ds_unique_bytes = 0; 1162 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1163 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1164 1165 VERIFY0(zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1166 snapname, 8, 1, &dsobj, tx)); 1167 1168 if (ds->ds_prev) 1169 dsl_dataset_rele(ds->ds_prev, ds); 1170 VERIFY0(dsl_dataset_hold_obj(dp, 1171 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1172 1173 dsl_scan_ds_snapshotted(ds, tx); 1174 1175 dsl_dir_snap_cmtime_update(ds->ds_dir); 1176 1177 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1178} 1179 1180static void 1181dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1182{ 1183 dsl_dataset_snapshot_arg_t *ddsa = arg; 1184 dsl_pool_t *dp = dmu_tx_pool(tx); 1185 nvpair_t *pair; 1186 1187 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1188 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1189 dsl_dataset_t *ds; 1190 char *name, *atp; 1191 char dsname[MAXNAMELEN]; 1192 1193 name = nvpair_name(pair); 1194 atp = strchr(name, '@'); 1195 (void) strlcpy(dsname, name, atp - name + 1); 1196 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1197 1198 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1199 if (ddsa->ddsa_props != NULL) { 1200 dsl_props_set_sync_impl(ds->ds_prev, 1201 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1202 } 1203 dsl_dataset_rele(ds, FTAG); 1204 } 1205} 1206 1207/* 1208 * The snapshots must all be in the same pool. 1209 * All-or-nothing: if there are any failures, nothing will be modified. 1210 */ 1211int 1212dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1213{ 1214 dsl_dataset_snapshot_arg_t ddsa; 1215 nvpair_t *pair; 1216 boolean_t needsuspend; 1217 int error; 1218 spa_t *spa; 1219 char *firstname; 1220 nvlist_t *suspended = NULL; 1221 1222 pair = nvlist_next_nvpair(snaps, NULL); 1223 if (pair == NULL) 1224 return (0); 1225 firstname = nvpair_name(pair); 1226 1227 error = spa_open(firstname, &spa, FTAG); 1228 if (error != 0) 1229 return (error); 1230 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1231 spa_close(spa, FTAG); 1232 1233 if (needsuspend) { 1234 suspended = fnvlist_alloc(); 1235 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1236 pair = nvlist_next_nvpair(snaps, pair)) { 1237 char fsname[MAXNAMELEN]; 1238 char *snapname = nvpair_name(pair); 1239 char *atp; 1240 void *cookie; 1241 1242 atp = strchr(snapname, '@'); 1243 if (atp == NULL) { 1244 error = SET_ERROR(EINVAL); 1245 break; 1246 } 1247 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1248 1249 error = zil_suspend(fsname, &cookie); 1250 if (error != 0) 1251 break; 1252 fnvlist_add_uint64(suspended, fsname, 1253 (uintptr_t)cookie); 1254 } 1255 } 1256 1257 ddsa.ddsa_snaps = snaps; 1258 ddsa.ddsa_props = props; 1259 ddsa.ddsa_errors = errors; 1260 1261 if (error == 0) { 1262 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1263 dsl_dataset_snapshot_sync, &ddsa, 1264 fnvlist_num_pairs(snaps) * 3); 1265 } 1266 1267 if (suspended != NULL) { 1268 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1269 pair = nvlist_next_nvpair(suspended, pair)) { 1270 zil_resume((void *)(uintptr_t) 1271 fnvpair_value_uint64(pair)); 1272 } 1273 fnvlist_free(suspended); 1274 } 1275 1276#ifdef __FreeBSD__ 1277#ifdef _KERNEL 1278 if (error == 0) { 1279 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1280 pair = nvlist_next_nvpair(snaps, pair)) { 1281 char *snapname = nvpair_name(pair); 1282 zvol_create_minors(snapname); 1283 } 1284 } 1285#endif 1286#endif 1287 return (error); 1288} 1289 1290typedef struct dsl_dataset_snapshot_tmp_arg { 1291 const char *ddsta_fsname; 1292 const char *ddsta_snapname; 1293 minor_t ddsta_cleanup_minor; 1294 const char *ddsta_htag; 1295} dsl_dataset_snapshot_tmp_arg_t; 1296 1297static int 1298dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1299{ 1300 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1301 dsl_pool_t *dp = dmu_tx_pool(tx); 1302 dsl_dataset_t *ds; 1303 int error; 1304 1305 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1306 if (error != 0) 1307 return (error); 1308 1309 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1310 tx, B_FALSE); 1311 if (error != 0) { 1312 dsl_dataset_rele(ds, FTAG); 1313 return (error); 1314 } 1315 1316 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1317 dsl_dataset_rele(ds, FTAG); 1318 return (SET_ERROR(ENOTSUP)); 1319 } 1320 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1321 B_TRUE, tx); 1322 if (error != 0) { 1323 dsl_dataset_rele(ds, FTAG); 1324 return (error); 1325 } 1326 1327 dsl_dataset_rele(ds, FTAG); 1328 return (0); 1329} 1330 1331static void 1332dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1333{ 1334 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1335 dsl_pool_t *dp = dmu_tx_pool(tx); 1336 dsl_dataset_t *ds; 1337 1338 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1339 1340 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1341 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1342 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1343 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1344 1345 dsl_dataset_rele(ds, FTAG); 1346} 1347 1348int 1349dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1350 minor_t cleanup_minor, const char *htag) 1351{ 1352 dsl_dataset_snapshot_tmp_arg_t ddsta; 1353 int error; 1354 spa_t *spa; 1355 boolean_t needsuspend; 1356 void *cookie; 1357 1358 ddsta.ddsta_fsname = fsname; 1359 ddsta.ddsta_snapname = snapname; 1360 ddsta.ddsta_cleanup_minor = cleanup_minor; 1361 ddsta.ddsta_htag = htag; 1362 1363 error = spa_open(fsname, &spa, FTAG); 1364 if (error != 0) 1365 return (error); 1366 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1367 spa_close(spa, FTAG); 1368 1369 if (needsuspend) { 1370 error = zil_suspend(fsname, &cookie); 1371 if (error != 0) 1372 return (error); 1373 } 1374 1375 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1376 dsl_dataset_snapshot_tmp_sync, &ddsta, 3); 1377 1378 if (needsuspend) 1379 zil_resume(cookie); 1380 return (error); 1381} 1382 1383 1384void 1385dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1386{ 1387 ASSERT(dmu_tx_is_syncing(tx)); 1388 ASSERT(ds->ds_objset != NULL); 1389 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1390 1391 /* 1392 * in case we had to change ds_fsid_guid when we opened it, 1393 * sync it out now. 1394 */ 1395 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1396 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1397 1398 dmu_objset_sync(ds->ds_objset, zio, tx); 1399} 1400 1401static void 1402get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1403{ 1404 uint64_t count = 0; 1405 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1406 zap_cursor_t zc; 1407 zap_attribute_t za; 1408 nvlist_t *propval = fnvlist_alloc(); 1409 nvlist_t *val = fnvlist_alloc(); 1410 1411 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1412 1413 /* 1414 * There may be missing entries in ds_next_clones_obj 1415 * due to a bug in a previous version of the code. 1416 * Only trust it if it has the right number of entries. 1417 */ 1418 if (ds->ds_phys->ds_next_clones_obj != 0) { 1419 VERIFY0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 1420 &count)); 1421 } 1422 if (count != ds->ds_phys->ds_num_children - 1) 1423 goto fail; 1424 for (zap_cursor_init(&zc, mos, ds->ds_phys->ds_next_clones_obj); 1425 zap_cursor_retrieve(&zc, &za) == 0; 1426 zap_cursor_advance(&zc)) { 1427 dsl_dataset_t *clone; 1428 char buf[ZFS_MAXNAMELEN]; 1429 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1430 za.za_first_integer, FTAG, &clone)); 1431 dsl_dir_name(clone->ds_dir, buf); 1432 fnvlist_add_boolean(val, buf); 1433 dsl_dataset_rele(clone, FTAG); 1434 } 1435 zap_cursor_fini(&zc); 1436 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1437 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1438fail: 1439 nvlist_free(val); 1440 nvlist_free(propval); 1441} 1442 1443void 1444dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1445{ 1446 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1447 uint64_t refd, avail, uobjs, aobjs, ratio; 1448 1449 ASSERT(dsl_pool_config_held(dp)); 1450 1451 ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1452 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1453 ds->ds_phys->ds_compressed_bytes); 1454 1455 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1456 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1457 ds->ds_phys->ds_uncompressed_bytes); 1458 1459 if (dsl_dataset_is_snapshot(ds)) { 1460 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1461 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1462 ds->ds_phys->ds_unique_bytes); 1463 get_clones_stat(ds, nv); 1464 } else { 1465 dsl_dir_stats(ds->ds_dir, nv); 1466 } 1467 1468 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1469 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1470 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1471 1472 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1473 ds->ds_phys->ds_creation_time); 1474 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1475 ds->ds_phys->ds_creation_txg); 1476 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1477 ds->ds_quota); 1478 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1479 ds->ds_reserved); 1480 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1481 ds->ds_phys->ds_guid); 1482 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1483 ds->ds_phys->ds_unique_bytes); 1484 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1485 ds->ds_object); 1486 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1487 ds->ds_userrefs); 1488 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1489 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1490 1491 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1492 uint64_t written, comp, uncomp; 1493 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1494 dsl_dataset_t *prev; 1495 1496 int err = dsl_dataset_hold_obj(dp, 1497 ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 1498 if (err == 0) { 1499 err = dsl_dataset_space_written(prev, ds, &written, 1500 &comp, &uncomp); 1501 dsl_dataset_rele(prev, FTAG); 1502 if (err == 0) { 1503 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1504 written); 1505 } 1506 } 1507 } 1508} 1509 1510void 1511dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1512{ 1513 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1514 ASSERT(dsl_pool_config_held(dp)); 1515 1516 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1517 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1518 stat->dds_guid = ds->ds_phys->ds_guid; 1519 stat->dds_origin[0] = '\0'; 1520 if (dsl_dataset_is_snapshot(ds)) { 1521 stat->dds_is_snapshot = B_TRUE; 1522 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1523 } else { 1524 stat->dds_is_snapshot = B_FALSE; 1525 stat->dds_num_clones = 0; 1526 1527 if (dsl_dir_is_clone(ds->ds_dir)) { 1528 dsl_dataset_t *ods; 1529 1530 VERIFY0(dsl_dataset_hold_obj(dp, 1531 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1532 dsl_dataset_name(ods, stat->dds_origin); 1533 dsl_dataset_rele(ods, FTAG); 1534 } 1535 } 1536} 1537 1538uint64_t 1539dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1540{ 1541 return (ds->ds_fsid_guid); 1542} 1543 1544void 1545dsl_dataset_space(dsl_dataset_t *ds, 1546 uint64_t *refdbytesp, uint64_t *availbytesp, 1547 uint64_t *usedobjsp, uint64_t *availobjsp) 1548{ 1549 *refdbytesp = ds->ds_phys->ds_referenced_bytes; 1550 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1551 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1552 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1553 if (ds->ds_quota != 0) { 1554 /* 1555 * Adjust available bytes according to refquota 1556 */ 1557 if (*refdbytesp < ds->ds_quota) 1558 *availbytesp = MIN(*availbytesp, 1559 ds->ds_quota - *refdbytesp); 1560 else 1561 *availbytesp = 0; 1562 } 1563 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 1564 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1565} 1566 1567boolean_t 1568dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1569{ 1570 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1571 1572 ASSERT(dsl_pool_config_held(dp)); 1573 if (snap == NULL) 1574 return (B_FALSE); 1575 if (ds->ds_phys->ds_bp.blk_birth > 1576 snap->ds_phys->ds_creation_txg) { 1577 objset_t *os, *os_snap; 1578 /* 1579 * It may be that only the ZIL differs, because it was 1580 * reset in the head. Don't count that as being 1581 * modified. 1582 */ 1583 if (dmu_objset_from_ds(ds, &os) != 0) 1584 return (B_TRUE); 1585 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1586 return (B_TRUE); 1587 return (bcmp(&os->os_phys->os_meta_dnode, 1588 &os_snap->os_phys->os_meta_dnode, 1589 sizeof (os->os_phys->os_meta_dnode)) != 0); 1590 } 1591 return (B_FALSE); 1592} 1593 1594typedef struct dsl_dataset_rename_snapshot_arg { 1595 const char *ddrsa_fsname; 1596 const char *ddrsa_oldsnapname; 1597 const char *ddrsa_newsnapname; 1598 boolean_t ddrsa_recursive; 1599 dmu_tx_t *ddrsa_tx; 1600} dsl_dataset_rename_snapshot_arg_t; 1601 1602/* ARGSUSED */ 1603static int 1604dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1605 dsl_dataset_t *hds, void *arg) 1606{ 1607 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1608 int error; 1609 uint64_t val; 1610 1611 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1612 if (error != 0) { 1613 /* ignore nonexistent snapshots */ 1614 return (error == ENOENT ? 0 : error); 1615 } 1616 1617 /* new name should not exist */ 1618 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1619 if (error == 0) 1620 error = SET_ERROR(EEXIST); 1621 else if (error == ENOENT) 1622 error = 0; 1623 1624 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1625 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1626 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 1627 error = SET_ERROR(ENAMETOOLONG); 1628 1629 return (error); 1630} 1631 1632static int 1633dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1634{ 1635 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1636 dsl_pool_t *dp = dmu_tx_pool(tx); 1637 dsl_dataset_t *hds; 1638 int error; 1639 1640 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1641 if (error != 0) 1642 return (error); 1643 1644 if (ddrsa->ddrsa_recursive) { 1645 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1646 dsl_dataset_rename_snapshot_check_impl, ddrsa, 1647 DS_FIND_CHILDREN); 1648 } else { 1649 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 1650 } 1651 dsl_dataset_rele(hds, FTAG); 1652 return (error); 1653} 1654 1655static int 1656dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 1657 dsl_dataset_t *hds, void *arg) 1658{ 1659#ifdef __FreeBSD__ 1660#ifdef _KERNEL 1661 char *oldname, *newname; 1662#endif 1663#endif 1664 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1665 dsl_dataset_t *ds; 1666 uint64_t val; 1667 dmu_tx_t *tx = ddrsa->ddrsa_tx; 1668 int error; 1669 1670 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1671 ASSERT(error == 0 || error == ENOENT); 1672 if (error == ENOENT) { 1673 /* ignore nonexistent snapshots */ 1674 return (0); 1675 } 1676 1677 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 1678 1679 /* log before we change the name */ 1680 spa_history_log_internal_ds(ds, "rename", tx, 1681 "-> @%s", ddrsa->ddrsa_newsnapname); 1682 1683 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx)); 1684 mutex_enter(&ds->ds_lock); 1685 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 1686 mutex_exit(&ds->ds_lock); 1687 VERIFY0(zap_add(dp->dp_meta_objset, hds->ds_phys->ds_snapnames_zapobj, 1688 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 1689 1690#ifdef __FreeBSD__ 1691#ifdef _KERNEL 1692 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1693 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1694 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1695 ddrsa->ddrsa_oldsnapname); 1696 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1697 ddrsa->ddrsa_newsnapname); 1698 zfsvfs_update_fromname(oldname, newname); 1699 zvol_rename_minors(oldname, newname); 1700 kmem_free(newname, MAXPATHLEN); 1701 kmem_free(oldname, MAXPATHLEN); 1702#endif 1703#endif 1704 dsl_dataset_rele(ds, FTAG); 1705 1706 return (0); 1707} 1708 1709static void 1710dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 1711{ 1712 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1713 dsl_pool_t *dp = dmu_tx_pool(tx); 1714 dsl_dataset_t *hds; 1715 1716 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 1717 ddrsa->ddrsa_tx = tx; 1718 if (ddrsa->ddrsa_recursive) { 1719 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1720 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 1721 DS_FIND_CHILDREN)); 1722 } else { 1723 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 1724 } 1725 dsl_dataset_rele(hds, FTAG); 1726} 1727 1728int 1729dsl_dataset_rename_snapshot(const char *fsname, 1730 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 1731{ 1732 dsl_dataset_rename_snapshot_arg_t ddrsa; 1733 1734 ddrsa.ddrsa_fsname = fsname; 1735 ddrsa.ddrsa_oldsnapname = oldsnapname; 1736 ddrsa.ddrsa_newsnapname = newsnapname; 1737 ddrsa.ddrsa_recursive = recursive; 1738 1739 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 1740 dsl_dataset_rename_snapshot_sync, &ddrsa, 1)); 1741} 1742 1743/* 1744 * If we're doing an ownership handoff, we need to make sure that there is 1745 * only one long hold on the dataset. We're not allowed to change anything here 1746 * so we don't permanently release the long hold or regular hold here. We want 1747 * to do this only when syncing to avoid the dataset unexpectedly going away 1748 * when we release the long hold. 1749 */ 1750static int 1751dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 1752{ 1753 boolean_t held; 1754 1755 if (!dmu_tx_is_syncing(tx)) 1756 return (0); 1757 1758 if (owner != NULL) { 1759 VERIFY3P(ds->ds_owner, ==, owner); 1760 dsl_dataset_long_rele(ds, owner); 1761 } 1762 1763 held = dsl_dataset_long_held(ds); 1764 1765 if (owner != NULL) 1766 dsl_dataset_long_hold(ds, owner); 1767 1768 if (held) 1769 return (SET_ERROR(EBUSY)); 1770 1771 return (0); 1772} 1773 1774typedef struct dsl_dataset_rollback_arg { 1775 const char *ddra_fsname; 1776 void *ddra_owner; 1777 nvlist_t *ddra_result; 1778} dsl_dataset_rollback_arg_t; 1779 1780static int 1781dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 1782{ 1783 dsl_dataset_rollback_arg_t *ddra = arg; 1784 dsl_pool_t *dp = dmu_tx_pool(tx); 1785 dsl_dataset_t *ds; 1786 int64_t unused_refres_delta; 1787 int error; 1788 1789 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 1790 if (error != 0) 1791 return (error); 1792 1793 /* must not be a snapshot */ 1794 if (dsl_dataset_is_snapshot(ds)) { 1795 dsl_dataset_rele(ds, FTAG); 1796 return (SET_ERROR(EINVAL)); 1797 } 1798 1799 /* must have a most recent snapshot */ 1800 if (ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) { 1801 dsl_dataset_rele(ds, FTAG); 1802 return (SET_ERROR(EINVAL)); 1803 } 1804 1805 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 1806 if (error != 0) { 1807 dsl_dataset_rele(ds, FTAG); 1808 return (error); 1809 } 1810 1811 /* 1812 * Check if the snap we are rolling back to uses more than 1813 * the refquota. 1814 */ 1815 if (ds->ds_quota != 0 && 1816 ds->ds_prev->ds_phys->ds_referenced_bytes > ds->ds_quota) { 1817 dsl_dataset_rele(ds, FTAG); 1818 return (SET_ERROR(EDQUOT)); 1819 } 1820 1821 /* 1822 * When we do the clone swap, we will temporarily use more space 1823 * due to the refreservation (the head will no longer have any 1824 * unique space, so the entire amount of the refreservation will need 1825 * to be free). We will immediately destroy the clone, freeing 1826 * this space, but the freeing happens over many txg's. 1827 */ 1828 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 1829 ds->ds_phys->ds_unique_bytes); 1830 1831 if (unused_refres_delta > 0 && 1832 unused_refres_delta > 1833 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 1834 dsl_dataset_rele(ds, FTAG); 1835 return (SET_ERROR(ENOSPC)); 1836 } 1837 1838 dsl_dataset_rele(ds, FTAG); 1839 return (0); 1840} 1841 1842static void 1843dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 1844{ 1845 dsl_dataset_rollback_arg_t *ddra = arg; 1846 dsl_pool_t *dp = dmu_tx_pool(tx); 1847 dsl_dataset_t *ds, *clone; 1848 uint64_t cloneobj; 1849 char namebuf[ZFS_MAXNAMELEN]; 1850 1851 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 1852 1853 dsl_dataset_name(ds->ds_prev, namebuf); 1854 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 1855 1856 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 1857 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 1858 1859 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 1860 1861 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 1862 dsl_dataset_zero_zil(ds, tx); 1863 1864 dsl_destroy_head_sync_impl(clone, tx); 1865 1866 dsl_dataset_rele(clone, FTAG); 1867 dsl_dataset_rele(ds, FTAG); 1868} 1869 1870/* 1871 * Rolls back the given filesystem or volume to the most recent snapshot. 1872 * The name of the most recent snapshot will be returned under key "target" 1873 * in the result nvlist. 1874 * 1875 * If owner != NULL: 1876 * - The existing dataset MUST be owned by the specified owner at entry 1877 * - Upon return, dataset will still be held by the same owner, whether we 1878 * succeed or not. 1879 * 1880 * This mode is required any time the existing filesystem is mounted. See 1881 * notes above zfs_suspend_fs() for further details. 1882 */ 1883int 1884dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 1885{ 1886 dsl_dataset_rollback_arg_t ddra; 1887 1888 ddra.ddra_fsname = fsname; 1889 ddra.ddra_owner = owner; 1890 ddra.ddra_result = result; 1891 1892 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 1893 dsl_dataset_rollback_sync, &ddra, 1)); 1894} 1895 1896struct promotenode { 1897 list_node_t link; 1898 dsl_dataset_t *ds; 1899}; 1900 1901typedef struct dsl_dataset_promote_arg { 1902 const char *ddpa_clonename; 1903 dsl_dataset_t *ddpa_clone; 1904 list_t shared_snaps, origin_snaps, clone_snaps; 1905 dsl_dataset_t *origin_origin; /* origin of the origin */ 1906 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 1907 char *err_ds; 1908} dsl_dataset_promote_arg_t; 1909 1910static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 1911static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 1912 void *tag); 1913static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 1914 1915static int 1916dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 1917{ 1918 dsl_dataset_promote_arg_t *ddpa = arg; 1919 dsl_pool_t *dp = dmu_tx_pool(tx); 1920 dsl_dataset_t *hds; 1921 struct promotenode *snap; 1922 dsl_dataset_t *origin_ds; 1923 int err; 1924 uint64_t unused; 1925 1926 err = promote_hold(ddpa, dp, FTAG); 1927 if (err != 0) 1928 return (err); 1929 1930 hds = ddpa->ddpa_clone; 1931 1932 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { 1933 promote_rele(ddpa, FTAG); 1934 return (SET_ERROR(EXDEV)); 1935 } 1936 1937 /* 1938 * Compute and check the amount of space to transfer. Since this is 1939 * so expensive, don't do the preliminary check. 1940 */ 1941 if (!dmu_tx_is_syncing(tx)) { 1942 promote_rele(ddpa, FTAG); 1943 return (0); 1944 } 1945 1946 snap = list_head(&ddpa->shared_snaps); 1947 origin_ds = snap->ds; 1948 1949 /* compute origin's new unique space */ 1950 snap = list_tail(&ddpa->clone_snaps); 1951 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 1952 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 1953 origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, 1954 &ddpa->unique, &unused, &unused); 1955 1956 /* 1957 * Walk the snapshots that we are moving 1958 * 1959 * Compute space to transfer. Consider the incremental changes 1960 * to used by each snapshot: 1961 * (my used) = (prev's used) + (blocks born) - (blocks killed) 1962 * So each snapshot gave birth to: 1963 * (blocks born) = (my used) - (prev's used) + (blocks killed) 1964 * So a sequence would look like: 1965 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 1966 * Which simplifies to: 1967 * uN + kN + kN-1 + ... + k1 + k0 1968 * Note however, if we stop before we reach the ORIGIN we get: 1969 * uN + kN + kN-1 + ... + kM - uM-1 1970 */ 1971 ddpa->used = origin_ds->ds_phys->ds_referenced_bytes; 1972 ddpa->comp = origin_ds->ds_phys->ds_compressed_bytes; 1973 ddpa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 1974 for (snap = list_head(&ddpa->shared_snaps); snap; 1975 snap = list_next(&ddpa->shared_snaps, snap)) { 1976 uint64_t val, dlused, dlcomp, dluncomp; 1977 dsl_dataset_t *ds = snap->ds; 1978 1979 /* 1980 * If there are long holds, we won't be able to evict 1981 * the objset. 1982 */ 1983 if (dsl_dataset_long_held(ds)) { 1984 err = SET_ERROR(EBUSY); 1985 goto out; 1986 } 1987 1988 /* Check that the snapshot name does not conflict */ 1989 VERIFY0(dsl_dataset_get_snapname(ds)); 1990 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 1991 if (err == 0) { 1992 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 1993 err = SET_ERROR(EEXIST); 1994 goto out; 1995 } 1996 if (err != ENOENT) 1997 goto out; 1998 1999 /* The very first snapshot does not have a deadlist */ 2000 if (ds->ds_phys->ds_prev_snap_obj == 0) 2001 continue; 2002 2003 dsl_deadlist_space(&ds->ds_deadlist, 2004 &dlused, &dlcomp, &dluncomp); 2005 ddpa->used += dlused; 2006 ddpa->comp += dlcomp; 2007 ddpa->uncomp += dluncomp; 2008 } 2009 2010 /* 2011 * If we are a clone of a clone then we never reached ORIGIN, 2012 * so we need to subtract out the clone origin's used space. 2013 */ 2014 if (ddpa->origin_origin) { 2015 ddpa->used -= ddpa->origin_origin->ds_phys->ds_referenced_bytes; 2016 ddpa->comp -= ddpa->origin_origin->ds_phys->ds_compressed_bytes; 2017 ddpa->uncomp -= 2018 ddpa->origin_origin->ds_phys->ds_uncompressed_bytes; 2019 } 2020 2021 /* Check that there is enough space here */ 2022 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2023 ddpa->used); 2024 if (err != 0) 2025 goto out; 2026 2027 /* 2028 * Compute the amounts of space that will be used by snapshots 2029 * after the promotion (for both origin and clone). For each, 2030 * it is the amount of space that will be on all of their 2031 * deadlists (that was not born before their new origin). 2032 */ 2033 if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2034 uint64_t space; 2035 2036 /* 2037 * Note, typically this will not be a clone of a clone, 2038 * so dd_origin_txg will be < TXG_INITIAL, so 2039 * these snaplist_space() -> dsl_deadlist_space_range() 2040 * calls will be fast because they do not have to 2041 * iterate over all bps. 2042 */ 2043 snap = list_head(&ddpa->origin_snaps); 2044 err = snaplist_space(&ddpa->shared_snaps, 2045 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2046 if (err != 0) 2047 goto out; 2048 2049 err = snaplist_space(&ddpa->clone_snaps, 2050 snap->ds->ds_dir->dd_origin_txg, &space); 2051 if (err != 0) 2052 goto out; 2053 ddpa->cloneusedsnap += space; 2054 } 2055 if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2056 err = snaplist_space(&ddpa->origin_snaps, 2057 origin_ds->ds_phys->ds_creation_txg, &ddpa->originusedsnap); 2058 if (err != 0) 2059 goto out; 2060 } 2061 2062out: 2063 promote_rele(ddpa, FTAG); 2064 return (err); 2065} 2066 2067static void 2068dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2069{ 2070 dsl_dataset_promote_arg_t *ddpa = arg; 2071 dsl_pool_t *dp = dmu_tx_pool(tx); 2072 dsl_dataset_t *hds; 2073 struct promotenode *snap; 2074 dsl_dataset_t *origin_ds; 2075 dsl_dataset_t *origin_head; 2076 dsl_dir_t *dd; 2077 dsl_dir_t *odd = NULL; 2078 uint64_t oldnext_obj; 2079 int64_t delta; 2080 2081 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2082 hds = ddpa->ddpa_clone; 2083 2084 ASSERT0(hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE); 2085 2086 snap = list_head(&ddpa->shared_snaps); 2087 origin_ds = snap->ds; 2088 dd = hds->ds_dir; 2089 2090 snap = list_head(&ddpa->origin_snaps); 2091 origin_head = snap->ds; 2092 2093 /* 2094 * We need to explicitly open odd, since origin_ds's dd will be 2095 * changing. 2096 */ 2097 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2098 NULL, FTAG, &odd)); 2099 2100 /* change origin's next snap */ 2101 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2102 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; 2103 snap = list_tail(&ddpa->clone_snaps); 2104 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2105 origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; 2106 2107 /* change the origin's next clone */ 2108 if (origin_ds->ds_phys->ds_next_clones_obj) { 2109 dsl_dataset_remove_from_next_clones(origin_ds, 2110 snap->ds->ds_object, tx); 2111 VERIFY0(zap_add_int(dp->dp_meta_objset, 2112 origin_ds->ds_phys->ds_next_clones_obj, 2113 oldnext_obj, tx)); 2114 } 2115 2116 /* change origin */ 2117 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2118 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 2119 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 2120 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2121 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2122 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 2123 origin_head->ds_dir->dd_origin_txg = 2124 origin_ds->ds_phys->ds_creation_txg; 2125 2126 /* change dd_clone entries */ 2127 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2128 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2129 odd->dd_phys->dd_clones, hds->ds_object, tx)); 2130 VERIFY0(zap_add_int(dp->dp_meta_objset, 2131 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2132 hds->ds_object, tx)); 2133 2134 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2135 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2136 origin_head->ds_object, tx)); 2137 if (dd->dd_phys->dd_clones == 0) { 2138 dd->dd_phys->dd_clones = zap_create(dp->dp_meta_objset, 2139 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 2140 } 2141 VERIFY0(zap_add_int(dp->dp_meta_objset, 2142 dd->dd_phys->dd_clones, origin_head->ds_object, tx)); 2143 } 2144 2145 /* move snapshots to this dir */ 2146 for (snap = list_head(&ddpa->shared_snaps); snap; 2147 snap = list_next(&ddpa->shared_snaps, snap)) { 2148 dsl_dataset_t *ds = snap->ds; 2149 2150 /* 2151 * Property callbacks are registered to a particular 2152 * dsl_dir. Since ours is changing, evict the objset 2153 * so that they will be unregistered from the old dsl_dir. 2154 */ 2155 if (ds->ds_objset) { 2156 dmu_objset_evict(ds->ds_objset); 2157 ds->ds_objset = NULL; 2158 } 2159 2160 /* move snap name entry */ 2161 VERIFY0(dsl_dataset_get_snapname(ds)); 2162 VERIFY0(dsl_dataset_snap_remove(origin_head, 2163 ds->ds_snapname, tx)); 2164 VERIFY0(zap_add(dp->dp_meta_objset, 2165 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2166 8, 1, &ds->ds_object, tx)); 2167 2168 /* change containing dsl_dir */ 2169 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2170 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2171 ds->ds_phys->ds_dir_obj = dd->dd_object; 2172 ASSERT3P(ds->ds_dir, ==, odd); 2173 dsl_dir_rele(ds->ds_dir, ds); 2174 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2175 NULL, ds, &ds->ds_dir)); 2176 2177 /* move any clone references */ 2178 if (ds->ds_phys->ds_next_clones_obj && 2179 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2180 zap_cursor_t zc; 2181 zap_attribute_t za; 2182 2183 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2184 ds->ds_phys->ds_next_clones_obj); 2185 zap_cursor_retrieve(&zc, &za) == 0; 2186 zap_cursor_advance(&zc)) { 2187 dsl_dataset_t *cnds; 2188 uint64_t o; 2189 2190 if (za.za_first_integer == oldnext_obj) { 2191 /* 2192 * We've already moved the 2193 * origin's reference. 2194 */ 2195 continue; 2196 } 2197 2198 VERIFY0(dsl_dataset_hold_obj(dp, 2199 za.za_first_integer, FTAG, &cnds)); 2200 o = cnds->ds_dir->dd_phys->dd_head_dataset_obj; 2201 2202 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2203 odd->dd_phys->dd_clones, o, tx)); 2204 VERIFY0(zap_add_int(dp->dp_meta_objset, 2205 dd->dd_phys->dd_clones, o, tx)); 2206 dsl_dataset_rele(cnds, FTAG); 2207 } 2208 zap_cursor_fini(&zc); 2209 } 2210 2211 ASSERT(!dsl_prop_hascb(ds)); 2212 } 2213 2214 /* 2215 * Change space accounting. 2216 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2217 * both be valid, or both be 0 (resulting in delta == 0). This 2218 * is true for each of {clone,origin} independently. 2219 */ 2220 2221 delta = ddpa->cloneusedsnap - 2222 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2223 ASSERT3S(delta, >=, 0); 2224 ASSERT3U(ddpa->used, >=, delta); 2225 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2226 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2227 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2228 2229 delta = ddpa->originusedsnap - 2230 odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2231 ASSERT3S(delta, <=, 0); 2232 ASSERT3U(ddpa->used, >=, -delta); 2233 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2234 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2235 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2236 2237 origin_ds->ds_phys->ds_unique_bytes = ddpa->unique; 2238 2239 /* log history record */ 2240 spa_history_log_internal_ds(hds, "promote", tx, ""); 2241 2242 dsl_dir_rele(odd, FTAG); 2243 promote_rele(ddpa, FTAG); 2244} 2245 2246/* 2247 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2248 * (exclusive) and last_obj (inclusive). The list will be in reverse 2249 * order (last_obj will be the list_head()). If first_obj == 0, do all 2250 * snapshots back to this dataset's origin. 2251 */ 2252static int 2253snaplist_make(dsl_pool_t *dp, 2254 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2255{ 2256 uint64_t obj = last_obj; 2257 2258 list_create(l, sizeof (struct promotenode), 2259 offsetof(struct promotenode, link)); 2260 2261 while (obj != first_obj) { 2262 dsl_dataset_t *ds; 2263 struct promotenode *snap; 2264 int err; 2265 2266 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2267 ASSERT(err != ENOENT); 2268 if (err != 0) 2269 return (err); 2270 2271 if (first_obj == 0) 2272 first_obj = ds->ds_dir->dd_phys->dd_origin_obj; 2273 2274 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2275 snap->ds = ds; 2276 list_insert_tail(l, snap); 2277 obj = ds->ds_phys->ds_prev_snap_obj; 2278 } 2279 2280 return (0); 2281} 2282 2283static int 2284snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2285{ 2286 struct promotenode *snap; 2287 2288 *spacep = 0; 2289 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2290 uint64_t used, comp, uncomp; 2291 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2292 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2293 *spacep += used; 2294 } 2295 return (0); 2296} 2297 2298static void 2299snaplist_destroy(list_t *l, void *tag) 2300{ 2301 struct promotenode *snap; 2302 2303 if (l == NULL || !list_link_active(&l->list_head)) 2304 return; 2305 2306 while ((snap = list_tail(l)) != NULL) { 2307 list_remove(l, snap); 2308 dsl_dataset_rele(snap->ds, tag); 2309 kmem_free(snap, sizeof (*snap)); 2310 } 2311 list_destroy(l); 2312} 2313 2314static int 2315promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2316{ 2317 int error; 2318 dsl_dir_t *dd; 2319 struct promotenode *snap; 2320 2321 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2322 &ddpa->ddpa_clone); 2323 if (error != 0) 2324 return (error); 2325 dd = ddpa->ddpa_clone->ds_dir; 2326 2327 if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) || 2328 !dsl_dir_is_clone(dd)) { 2329 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2330 return (SET_ERROR(EINVAL)); 2331 } 2332 2333 error = snaplist_make(dp, 0, dd->dd_phys->dd_origin_obj, 2334 &ddpa->shared_snaps, tag); 2335 if (error != 0) 2336 goto out; 2337 2338 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2339 &ddpa->clone_snaps, tag); 2340 if (error != 0) 2341 goto out; 2342 2343 snap = list_head(&ddpa->shared_snaps); 2344 ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); 2345 error = snaplist_make(dp, dd->dd_phys->dd_origin_obj, 2346 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, 2347 &ddpa->origin_snaps, tag); 2348 if (error != 0) 2349 goto out; 2350 2351 if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) { 2352 error = dsl_dataset_hold_obj(dp, 2353 snap->ds->ds_dir->dd_phys->dd_origin_obj, 2354 tag, &ddpa->origin_origin); 2355 if (error != 0) 2356 goto out; 2357 } 2358out: 2359 if (error != 0) 2360 promote_rele(ddpa, tag); 2361 return (error); 2362} 2363 2364static void 2365promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2366{ 2367 snaplist_destroy(&ddpa->shared_snaps, tag); 2368 snaplist_destroy(&ddpa->clone_snaps, tag); 2369 snaplist_destroy(&ddpa->origin_snaps, tag); 2370 if (ddpa->origin_origin != NULL) 2371 dsl_dataset_rele(ddpa->origin_origin, tag); 2372 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2373} 2374 2375/* 2376 * Promote a clone. 2377 * 2378 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2379 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2380 */ 2381int 2382dsl_dataset_promote(const char *name, char *conflsnap) 2383{ 2384 dsl_dataset_promote_arg_t ddpa = { 0 }; 2385 uint64_t numsnaps; 2386 int error; 2387 objset_t *os; 2388 2389 /* 2390 * We will modify space proportional to the number of 2391 * snapshots. Compute numsnaps. 2392 */ 2393 error = dmu_objset_hold(name, FTAG, &os); 2394 if (error != 0) 2395 return (error); 2396 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2397 dmu_objset_ds(os)->ds_phys->ds_snapnames_zapobj, &numsnaps); 2398 dmu_objset_rele(os, FTAG); 2399 if (error != 0) 2400 return (error); 2401 2402 ddpa.ddpa_clonename = name; 2403 ddpa.err_ds = conflsnap; 2404 2405 return (dsl_sync_task(name, dsl_dataset_promote_check, 2406 dsl_dataset_promote_sync, &ddpa, 2 + numsnaps)); 2407} 2408 2409int 2410dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2411 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2412{ 2413 int64_t unused_refres_delta; 2414 2415 /* they should both be heads */ 2416 if (dsl_dataset_is_snapshot(clone) || 2417 dsl_dataset_is_snapshot(origin_head)) 2418 return (SET_ERROR(EINVAL)); 2419 2420 /* if we are not forcing, the branch point should be just before them */ 2421 if (!force && clone->ds_prev != origin_head->ds_prev) 2422 return (SET_ERROR(EINVAL)); 2423 2424 /* clone should be the clone (unless they are unrelated) */ 2425 if (clone->ds_prev != NULL && 2426 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2427 origin_head->ds_dir != clone->ds_prev->ds_dir) 2428 return (SET_ERROR(EINVAL)); 2429 2430 /* the clone should be a child of the origin */ 2431 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2432 return (SET_ERROR(EINVAL)); 2433 2434 /* origin_head shouldn't be modified unless 'force' */ 2435 if (!force && 2436 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2437 return (SET_ERROR(ETXTBSY)); 2438 2439 /* origin_head should have no long holds (e.g. is not mounted) */ 2440 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2441 return (SET_ERROR(EBUSY)); 2442 2443 /* check amount of any unconsumed refreservation */ 2444 unused_refres_delta = 2445 (int64_t)MIN(origin_head->ds_reserved, 2446 origin_head->ds_phys->ds_unique_bytes) - 2447 (int64_t)MIN(origin_head->ds_reserved, 2448 clone->ds_phys->ds_unique_bytes); 2449 2450 if (unused_refres_delta > 0 && 2451 unused_refres_delta > 2452 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2453 return (SET_ERROR(ENOSPC)); 2454 2455 /* clone can't be over the head's refquota */ 2456 if (origin_head->ds_quota != 0 && 2457 clone->ds_phys->ds_referenced_bytes > origin_head->ds_quota) 2458 return (SET_ERROR(EDQUOT)); 2459 2460 return (0); 2461} 2462 2463void 2464dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2465 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2466{ 2467 dsl_pool_t *dp = dmu_tx_pool(tx); 2468 int64_t unused_refres_delta; 2469 2470 ASSERT(clone->ds_reserved == 0); 2471 ASSERT(origin_head->ds_quota == 0 || 2472 clone->ds_phys->ds_unique_bytes <= origin_head->ds_quota); 2473 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2474 2475 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2476 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2477 2478 if (clone->ds_objset != NULL) { 2479 dmu_objset_evict(clone->ds_objset); 2480 clone->ds_objset = NULL; 2481 } 2482 2483 if (origin_head->ds_objset != NULL) { 2484 dmu_objset_evict(origin_head->ds_objset); 2485 origin_head->ds_objset = NULL; 2486 } 2487 2488 unused_refres_delta = 2489 (int64_t)MIN(origin_head->ds_reserved, 2490 origin_head->ds_phys->ds_unique_bytes) - 2491 (int64_t)MIN(origin_head->ds_reserved, 2492 clone->ds_phys->ds_unique_bytes); 2493 2494 /* 2495 * Reset origin's unique bytes, if it exists. 2496 */ 2497 if (clone->ds_prev) { 2498 dsl_dataset_t *origin = clone->ds_prev; 2499 uint64_t comp, uncomp; 2500 2501 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2502 dsl_deadlist_space_range(&clone->ds_deadlist, 2503 origin->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2504 &origin->ds_phys->ds_unique_bytes, &comp, &uncomp); 2505 } 2506 2507 /* swap blkptrs */ 2508 { 2509 blkptr_t tmp; 2510 tmp = origin_head->ds_phys->ds_bp; 2511 origin_head->ds_phys->ds_bp = clone->ds_phys->ds_bp; 2512 clone->ds_phys->ds_bp = tmp; 2513 } 2514 2515 /* set dd_*_bytes */ 2516 { 2517 int64_t dused, dcomp, duncomp; 2518 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2519 uint64_t odl_used, odl_comp, odl_uncomp; 2520 2521 ASSERT3U(clone->ds_dir->dd_phys-> 2522 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2523 2524 dsl_deadlist_space(&clone->ds_deadlist, 2525 &cdl_used, &cdl_comp, &cdl_uncomp); 2526 dsl_deadlist_space(&origin_head->ds_deadlist, 2527 &odl_used, &odl_comp, &odl_uncomp); 2528 2529 dused = clone->ds_phys->ds_referenced_bytes + cdl_used - 2530 (origin_head->ds_phys->ds_referenced_bytes + odl_used); 2531 dcomp = clone->ds_phys->ds_compressed_bytes + cdl_comp - 2532 (origin_head->ds_phys->ds_compressed_bytes + odl_comp); 2533 duncomp = clone->ds_phys->ds_uncompressed_bytes + 2534 cdl_uncomp - 2535 (origin_head->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2536 2537 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2538 dused, dcomp, duncomp, tx); 2539 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2540 -dused, -dcomp, -duncomp, tx); 2541 2542 /* 2543 * The difference in the space used by snapshots is the 2544 * difference in snapshot space due to the head's 2545 * deadlist (since that's the only thing that's 2546 * changing that affects the snapused). 2547 */ 2548 dsl_deadlist_space_range(&clone->ds_deadlist, 2549 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2550 &cdl_used, &cdl_comp, &cdl_uncomp); 2551 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2552 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2553 &odl_used, &odl_comp, &odl_uncomp); 2554 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2555 DD_USED_HEAD, DD_USED_SNAP, tx); 2556 } 2557 2558 /* swap ds_*_bytes */ 2559 SWITCH64(origin_head->ds_phys->ds_referenced_bytes, 2560 clone->ds_phys->ds_referenced_bytes); 2561 SWITCH64(origin_head->ds_phys->ds_compressed_bytes, 2562 clone->ds_phys->ds_compressed_bytes); 2563 SWITCH64(origin_head->ds_phys->ds_uncompressed_bytes, 2564 clone->ds_phys->ds_uncompressed_bytes); 2565 SWITCH64(origin_head->ds_phys->ds_unique_bytes, 2566 clone->ds_phys->ds_unique_bytes); 2567 2568 /* apply any parent delta for change in unconsumed refreservation */ 2569 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 2570 unused_refres_delta, 0, 0, tx); 2571 2572 /* 2573 * Swap deadlists. 2574 */ 2575 dsl_deadlist_close(&clone->ds_deadlist); 2576 dsl_deadlist_close(&origin_head->ds_deadlist); 2577 SWITCH64(origin_head->ds_phys->ds_deadlist_obj, 2578 clone->ds_phys->ds_deadlist_obj); 2579 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 2580 clone->ds_phys->ds_deadlist_obj); 2581 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 2582 origin_head->ds_phys->ds_deadlist_obj); 2583 2584 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 2585 2586 spa_history_log_internal_ds(clone, "clone swap", tx, 2587 "parent=%s", origin_head->ds_dir->dd_myname); 2588} 2589 2590/* 2591 * Given a pool name and a dataset object number in that pool, 2592 * return the name of that dataset. 2593 */ 2594int 2595dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2596{ 2597 dsl_pool_t *dp; 2598 dsl_dataset_t *ds; 2599 int error; 2600 2601 error = dsl_pool_hold(pname, FTAG, &dp); 2602 if (error != 0) 2603 return (error); 2604 2605 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 2606 if (error == 0) { 2607 dsl_dataset_name(ds, buf); 2608 dsl_dataset_rele(ds, FTAG); 2609 } 2610 dsl_pool_rele(dp, FTAG); 2611 2612 return (error); 2613} 2614 2615int 2616dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2617 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2618{ 2619 int error = 0; 2620 2621 ASSERT3S(asize, >, 0); 2622 2623 /* 2624 * *ref_rsrv is the portion of asize that will come from any 2625 * unconsumed refreservation space. 2626 */ 2627 *ref_rsrv = 0; 2628 2629 mutex_enter(&ds->ds_lock); 2630 /* 2631 * Make a space adjustment for reserved bytes. 2632 */ 2633 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2634 ASSERT3U(*used, >=, 2635 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2636 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2637 *ref_rsrv = 2638 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2639 } 2640 2641 if (!check_quota || ds->ds_quota == 0) { 2642 mutex_exit(&ds->ds_lock); 2643 return (0); 2644 } 2645 /* 2646 * If they are requesting more space, and our current estimate 2647 * is over quota, they get to try again unless the actual 2648 * on-disk is over quota and there are no pending changes (which 2649 * may free up space for us). 2650 */ 2651 if (ds->ds_phys->ds_referenced_bytes + inflight >= ds->ds_quota) { 2652 if (inflight > 0 || 2653 ds->ds_phys->ds_referenced_bytes < ds->ds_quota) 2654 error = SET_ERROR(ERESTART); 2655 else 2656 error = SET_ERROR(EDQUOT); 2657 } 2658 mutex_exit(&ds->ds_lock); 2659 2660 return (error); 2661} 2662 2663typedef struct dsl_dataset_set_qr_arg { 2664 const char *ddsqra_name; 2665 zprop_source_t ddsqra_source; 2666 uint64_t ddsqra_value; 2667} dsl_dataset_set_qr_arg_t; 2668 2669 2670/* ARGSUSED */ 2671static int 2672dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 2673{ 2674 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2675 dsl_pool_t *dp = dmu_tx_pool(tx); 2676 dsl_dataset_t *ds; 2677 int error; 2678 uint64_t newval; 2679 2680 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 2681 return (SET_ERROR(ENOTSUP)); 2682 2683 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2684 if (error != 0) 2685 return (error); 2686 2687 if (dsl_dataset_is_snapshot(ds)) { 2688 dsl_dataset_rele(ds, FTAG); 2689 return (SET_ERROR(EINVAL)); 2690 } 2691 2692 error = dsl_prop_predict(ds->ds_dir, 2693 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2694 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2695 if (error != 0) { 2696 dsl_dataset_rele(ds, FTAG); 2697 return (error); 2698 } 2699 2700 if (newval == 0) { 2701 dsl_dataset_rele(ds, FTAG); 2702 return (0); 2703 } 2704 2705 if (newval < ds->ds_phys->ds_referenced_bytes || 2706 newval < ds->ds_reserved) { 2707 dsl_dataset_rele(ds, FTAG); 2708 return (SET_ERROR(ENOSPC)); 2709 } 2710 2711 dsl_dataset_rele(ds, FTAG); 2712 return (0); 2713} 2714 2715static void 2716dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 2717{ 2718 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2719 dsl_pool_t *dp = dmu_tx_pool(tx); 2720 dsl_dataset_t *ds; 2721 uint64_t newval; 2722 2723 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2724 2725 dsl_prop_set_sync_impl(ds, 2726 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2727 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 2728 &ddsqra->ddsqra_value, tx); 2729 2730 VERIFY0(dsl_prop_get_int_ds(ds, 2731 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 2732 2733 if (ds->ds_quota != newval) { 2734 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2735 ds->ds_quota = newval; 2736 } 2737 dsl_dataset_rele(ds, FTAG); 2738} 2739 2740int 2741dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 2742 uint64_t refquota) 2743{ 2744 dsl_dataset_set_qr_arg_t ddsqra; 2745 2746 ddsqra.ddsqra_name = dsname; 2747 ddsqra.ddsqra_source = source; 2748 ddsqra.ddsqra_value = refquota; 2749 2750 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 2751 dsl_dataset_set_refquota_sync, &ddsqra, 0)); 2752} 2753 2754static int 2755dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 2756{ 2757 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2758 dsl_pool_t *dp = dmu_tx_pool(tx); 2759 dsl_dataset_t *ds; 2760 int error; 2761 uint64_t newval, unique; 2762 2763 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 2764 return (SET_ERROR(ENOTSUP)); 2765 2766 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2767 if (error != 0) 2768 return (error); 2769 2770 if (dsl_dataset_is_snapshot(ds)) { 2771 dsl_dataset_rele(ds, FTAG); 2772 return (SET_ERROR(EINVAL)); 2773 } 2774 2775 error = dsl_prop_predict(ds->ds_dir, 2776 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2777 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2778 if (error != 0) { 2779 dsl_dataset_rele(ds, FTAG); 2780 return (error); 2781 } 2782 2783 /* 2784 * If we are doing the preliminary check in open context, the 2785 * space estimates may be inaccurate. 2786 */ 2787 if (!dmu_tx_is_syncing(tx)) { 2788 dsl_dataset_rele(ds, FTAG); 2789 return (0); 2790 } 2791 2792 mutex_enter(&ds->ds_lock); 2793 if (!DS_UNIQUE_IS_ACCURATE(ds)) 2794 dsl_dataset_recalc_head_uniq(ds); 2795 unique = ds->ds_phys->ds_unique_bytes; 2796 mutex_exit(&ds->ds_lock); 2797 2798 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 2799 uint64_t delta = MAX(unique, newval) - 2800 MAX(unique, ds->ds_reserved); 2801 2802 if (delta > 2803 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 2804 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 2805 dsl_dataset_rele(ds, FTAG); 2806 return (SET_ERROR(ENOSPC)); 2807 } 2808 } 2809 2810 dsl_dataset_rele(ds, FTAG); 2811 return (0); 2812} 2813 2814void 2815dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 2816 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 2817{ 2818 uint64_t newval; 2819 uint64_t unique; 2820 int64_t delta; 2821 2822 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2823 source, sizeof (value), 1, &value, tx); 2824 2825 VERIFY0(dsl_prop_get_int_ds(ds, 2826 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 2827 2828 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2829 mutex_enter(&ds->ds_dir->dd_lock); 2830 mutex_enter(&ds->ds_lock); 2831 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 2832 unique = ds->ds_phys->ds_unique_bytes; 2833 delta = MAX(0, (int64_t)(newval - unique)) - 2834 MAX(0, (int64_t)(ds->ds_reserved - unique)); 2835 ds->ds_reserved = newval; 2836 mutex_exit(&ds->ds_lock); 2837 2838 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 2839 mutex_exit(&ds->ds_dir->dd_lock); 2840} 2841 2842static void 2843dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 2844{ 2845 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2846 dsl_pool_t *dp = dmu_tx_pool(tx); 2847 dsl_dataset_t *ds; 2848 2849 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2850 dsl_dataset_set_refreservation_sync_impl(ds, 2851 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 2852 dsl_dataset_rele(ds, FTAG); 2853} 2854 2855int 2856dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 2857 uint64_t refreservation) 2858{ 2859 dsl_dataset_set_qr_arg_t ddsqra; 2860 2861 ddsqra.ddsqra_name = dsname; 2862 ddsqra.ddsqra_source = source; 2863 ddsqra.ddsqra_value = refreservation; 2864 2865 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 2866 dsl_dataset_set_refreservation_sync, &ddsqra, 0)); 2867} 2868 2869/* 2870 * Return (in *usedp) the amount of space written in new that is not 2871 * present in oldsnap. New may be a snapshot or the head. Old must be 2872 * a snapshot before new, in new's filesystem (or its origin). If not then 2873 * fail and return EINVAL. 2874 * 2875 * The written space is calculated by considering two components: First, we 2876 * ignore any freed space, and calculate the written as new's used space 2877 * minus old's used space. Next, we add in the amount of space that was freed 2878 * between the two snapshots, thus reducing new's used space relative to old's. 2879 * Specifically, this is the space that was born before old->ds_creation_txg, 2880 * and freed before new (ie. on new's deadlist or a previous deadlist). 2881 * 2882 * space freed [---------------------] 2883 * snapshots ---O-------O--------O-------O------ 2884 * oldsnap new 2885 */ 2886int 2887dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 2888 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 2889{ 2890 int err = 0; 2891 uint64_t snapobj; 2892 dsl_pool_t *dp = new->ds_dir->dd_pool; 2893 2894 ASSERT(dsl_pool_config_held(dp)); 2895 2896 *usedp = 0; 2897 *usedp += new->ds_phys->ds_referenced_bytes; 2898 *usedp -= oldsnap->ds_phys->ds_referenced_bytes; 2899 2900 *compp = 0; 2901 *compp += new->ds_phys->ds_compressed_bytes; 2902 *compp -= oldsnap->ds_phys->ds_compressed_bytes; 2903 2904 *uncompp = 0; 2905 *uncompp += new->ds_phys->ds_uncompressed_bytes; 2906 *uncompp -= oldsnap->ds_phys->ds_uncompressed_bytes; 2907 2908 snapobj = new->ds_object; 2909 while (snapobj != oldsnap->ds_object) { 2910 dsl_dataset_t *snap; 2911 uint64_t used, comp, uncomp; 2912 2913 if (snapobj == new->ds_object) { 2914 snap = new; 2915 } else { 2916 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 2917 if (err != 0) 2918 break; 2919 } 2920 2921 if (snap->ds_phys->ds_prev_snap_txg == 2922 oldsnap->ds_phys->ds_creation_txg) { 2923 /* 2924 * The blocks in the deadlist can not be born after 2925 * ds_prev_snap_txg, so get the whole deadlist space, 2926 * which is more efficient (especially for old-format 2927 * deadlists). Unfortunately the deadlist code 2928 * doesn't have enough information to make this 2929 * optimization itself. 2930 */ 2931 dsl_deadlist_space(&snap->ds_deadlist, 2932 &used, &comp, &uncomp); 2933 } else { 2934 dsl_deadlist_space_range(&snap->ds_deadlist, 2935 0, oldsnap->ds_phys->ds_creation_txg, 2936 &used, &comp, &uncomp); 2937 } 2938 *usedp += used; 2939 *compp += comp; 2940 *uncompp += uncomp; 2941 2942 /* 2943 * If we get to the beginning of the chain of snapshots 2944 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 2945 * was not a snapshot of/before new. 2946 */ 2947 snapobj = snap->ds_phys->ds_prev_snap_obj; 2948 if (snap != new) 2949 dsl_dataset_rele(snap, FTAG); 2950 if (snapobj == 0) { 2951 err = SET_ERROR(EINVAL); 2952 break; 2953 } 2954 2955 } 2956 return (err); 2957} 2958 2959/* 2960 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 2961 * lastsnap, and all snapshots in between are deleted. 2962 * 2963 * blocks that would be freed [---------------------------] 2964 * snapshots ---O-------O--------O-------O--------O 2965 * firstsnap lastsnap 2966 * 2967 * This is the set of blocks that were born after the snap before firstsnap, 2968 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 2969 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 2970 * We calculate this by iterating over the relevant deadlists (from the snap 2971 * after lastsnap, backward to the snap after firstsnap), summing up the 2972 * space on the deadlist that was born after the snap before firstsnap. 2973 */ 2974int 2975dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 2976 dsl_dataset_t *lastsnap, 2977 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 2978{ 2979 int err = 0; 2980 uint64_t snapobj; 2981 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 2982 2983 ASSERT(dsl_dataset_is_snapshot(firstsnap)); 2984 ASSERT(dsl_dataset_is_snapshot(lastsnap)); 2985 2986 /* 2987 * Check that the snapshots are in the same dsl_dir, and firstsnap 2988 * is before lastsnap. 2989 */ 2990 if (firstsnap->ds_dir != lastsnap->ds_dir || 2991 firstsnap->ds_phys->ds_creation_txg > 2992 lastsnap->ds_phys->ds_creation_txg) 2993 return (SET_ERROR(EINVAL)); 2994 2995 *usedp = *compp = *uncompp = 0; 2996 2997 snapobj = lastsnap->ds_phys->ds_next_snap_obj; 2998 while (snapobj != firstsnap->ds_object) { 2999 dsl_dataset_t *ds; 3000 uint64_t used, comp, uncomp; 3001 3002 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3003 if (err != 0) 3004 break; 3005 3006 dsl_deadlist_space_range(&ds->ds_deadlist, 3007 firstsnap->ds_phys->ds_prev_snap_txg, UINT64_MAX, 3008 &used, &comp, &uncomp); 3009 *usedp += used; 3010 *compp += comp; 3011 *uncompp += uncomp; 3012 3013 snapobj = ds->ds_phys->ds_prev_snap_obj; 3014 ASSERT3U(snapobj, !=, 0); 3015 dsl_dataset_rele(ds, FTAG); 3016 } 3017 return (err); 3018} 3019 3020/* 3021 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3022 * For example, they could both be snapshots of the same filesystem, and 3023 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3024 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3025 * filesystem. Or 'earlier' could be the origin's origin. 3026 */ 3027boolean_t 3028dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier) 3029{ 3030 dsl_pool_t *dp = later->ds_dir->dd_pool; 3031 int error; 3032 boolean_t ret; 3033 3034 ASSERT(dsl_pool_config_held(dp)); 3035 3036 if (earlier->ds_phys->ds_creation_txg >= 3037 later->ds_phys->ds_creation_txg) 3038 return (B_FALSE); 3039 3040 if (later->ds_dir == earlier->ds_dir) 3041 return (B_TRUE); 3042 if (!dsl_dir_is_clone(later->ds_dir)) 3043 return (B_FALSE); 3044 3045 if (later->ds_dir->dd_phys->dd_origin_obj == earlier->ds_object) 3046 return (B_TRUE); 3047 dsl_dataset_t *origin; 3048 error = dsl_dataset_hold_obj(dp, 3049 later->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin); 3050 if (error != 0) 3051 return (B_FALSE); 3052 ret = dsl_dataset_is_before(origin, earlier); 3053 dsl_dataset_rele(origin, FTAG); 3054 return (ret); 3055} 3056 3057 3058void 3059dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3060{ 3061 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3062 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3063} 3064