dsl_dataset.c revision 263407
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#include <sys/dsl_bookmark.h> 53 54#define SWITCH64(x, y) \ 55 { \ 56 uint64_t __tmp = (x); \ 57 (x) = (y); \ 58 (y) = __tmp; \ 59 } 60 61#define DS_REF_MAX (1ULL << 62) 62 63#define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 64 65/* 66 * Figure out how much of this delta should be propogated to the dsl_dir 67 * layer. If there's a refreservation, that space has already been 68 * partially accounted for in our ancestors. 69 */ 70static int64_t 71parent_delta(dsl_dataset_t *ds, int64_t delta) 72{ 73 uint64_t old_bytes, new_bytes; 74 75 if (ds->ds_reserved == 0) 76 return (delta); 77 78 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 79 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 80 81 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 82 return (new_bytes - old_bytes); 83} 84 85void 86dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 87{ 88 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 89 int compressed = BP_GET_PSIZE(bp); 90 int uncompressed = BP_GET_UCSIZE(bp); 91 int64_t delta; 92 93 dprintf_bp(bp, "ds=%p", ds); 94 95 ASSERT(dmu_tx_is_syncing(tx)); 96 /* It could have been compressed away to nothing */ 97 if (BP_IS_HOLE(bp)) 98 return; 99 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 100 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 101 if (ds == NULL) { 102 dsl_pool_mos_diduse_space(tx->tx_pool, 103 used, compressed, uncompressed); 104 return; 105 } 106 107 dmu_buf_will_dirty(ds->ds_dbuf, tx); 108 mutex_enter(&ds->ds_lock); 109 delta = parent_delta(ds, used); 110 ds->ds_phys->ds_referenced_bytes += used; 111 ds->ds_phys->ds_compressed_bytes += compressed; 112 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 113 ds->ds_phys->ds_unique_bytes += used; 114 mutex_exit(&ds->ds_lock); 115 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 116 compressed, uncompressed, tx); 117 dsl_dir_transfer_space(ds->ds_dir, used - delta, 118 DD_USED_REFRSRV, DD_USED_HEAD, tx); 119} 120 121int 122dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 123 boolean_t async) 124{ 125 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 126 int compressed = BP_GET_PSIZE(bp); 127 int uncompressed = BP_GET_UCSIZE(bp); 128 129 if (BP_IS_HOLE(bp)) 130 return (0); 131 132 ASSERT(dmu_tx_is_syncing(tx)); 133 ASSERT(bp->blk_birth <= tx->tx_txg); 134 135 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 (bp != NULL && BP_IS_HOLE(bp))) 234 return (B_FALSE); 235 236 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 237 238 return (B_TRUE); 239} 240 241/* ARGSUSED */ 242static void 243dsl_dataset_evict(dmu_buf_t *db, void *dsv) 244{ 245 dsl_dataset_t *ds = dsv; 246 247 ASSERT(ds->ds_owner == NULL); 248 249 unique_remove(ds->ds_fsid_guid); 250 251 if (ds->ds_objset != NULL) 252 dmu_objset_evict(ds->ds_objset); 253 254 if (ds->ds_prev) { 255 dsl_dataset_rele(ds->ds_prev, ds); 256 ds->ds_prev = NULL; 257 } 258 259 bplist_destroy(&ds->ds_pending_deadlist); 260 if (ds->ds_phys->ds_deadlist_obj != 0) 261 dsl_deadlist_close(&ds->ds_deadlist); 262 if (ds->ds_dir) 263 dsl_dir_rele(ds->ds_dir, ds); 264 265 ASSERT(!list_link_active(&ds->ds_synced_link)); 266 267 if (mutex_owned(&ds->ds_lock)) 268 mutex_exit(&ds->ds_lock); 269 mutex_destroy(&ds->ds_lock); 270 if (mutex_owned(&ds->ds_opening_lock)) 271 mutex_exit(&ds->ds_opening_lock); 272 mutex_destroy(&ds->ds_opening_lock); 273 refcount_destroy(&ds->ds_longholds); 274 275 kmem_free(ds, sizeof (dsl_dataset_t)); 276} 277 278int 279dsl_dataset_get_snapname(dsl_dataset_t *ds) 280{ 281 dsl_dataset_phys_t *headphys; 282 int err; 283 dmu_buf_t *headdbuf; 284 dsl_pool_t *dp = ds->ds_dir->dd_pool; 285 objset_t *mos = dp->dp_meta_objset; 286 287 if (ds->ds_snapname[0]) 288 return (0); 289 if (ds->ds_phys->ds_next_snap_obj == 0) 290 return (0); 291 292 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 293 FTAG, &headdbuf); 294 if (err != 0) 295 return (err); 296 headphys = headdbuf->db_data; 297 err = zap_value_search(dp->dp_meta_objset, 298 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 299 dmu_buf_rele(headdbuf, FTAG); 300 return (err); 301} 302 303int 304dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 305{ 306 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 307 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 308 matchtype_t mt; 309 int err; 310 311 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 312 mt = MT_FIRST; 313 else 314 mt = MT_EXACT; 315 316 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 317 value, mt, NULL, 0, NULL); 318 if (err == ENOTSUP && mt == MT_FIRST) 319 err = zap_lookup(mos, snapobj, name, 8, 1, value); 320 return (err); 321} 322 323int 324dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx) 325{ 326 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 327 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 328 matchtype_t mt; 329 int err; 330 331 dsl_dir_snap_cmtime_update(ds->ds_dir); 332 333 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 334 mt = MT_FIRST; 335 else 336 mt = MT_EXACT; 337 338 err = zap_remove_norm(mos, snapobj, name, mt, tx); 339 if (err == ENOTSUP && mt == MT_FIRST) 340 err = zap_remove(mos, snapobj, name, tx); 341 return (err); 342} 343 344int 345dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 346 dsl_dataset_t **dsp) 347{ 348 objset_t *mos = dp->dp_meta_objset; 349 dmu_buf_t *dbuf; 350 dsl_dataset_t *ds; 351 int err; 352 dmu_object_info_t doi; 353 354 ASSERT(dsl_pool_config_held(dp)); 355 356 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 357 if (err != 0) 358 return (err); 359 360 /* Make sure dsobj has the correct object type. */ 361 dmu_object_info_from_db(dbuf, &doi); 362 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 363 dmu_buf_rele(dbuf, tag); 364 return (SET_ERROR(EINVAL)); 365 } 366 367 ds = dmu_buf_get_user(dbuf); 368 if (ds == NULL) { 369 dsl_dataset_t *winner = NULL; 370 371 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 372 ds->ds_dbuf = dbuf; 373 ds->ds_object = dsobj; 374 ds->ds_phys = dbuf->db_data; 375 376 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 377 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 378 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 379 refcount_create(&ds->ds_longholds); 380 381 bplist_create(&ds->ds_pending_deadlist); 382 dsl_deadlist_open(&ds->ds_deadlist, 383 mos, ds->ds_phys->ds_deadlist_obj); 384 385 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 386 offsetof(dmu_sendarg_t, dsa_link)); 387 388 if (err == 0) { 389 err = dsl_dir_hold_obj(dp, 390 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 391 } 392 if (err != 0) { 393 mutex_destroy(&ds->ds_lock); 394 mutex_destroy(&ds->ds_opening_lock); 395 refcount_destroy(&ds->ds_longholds); 396 bplist_destroy(&ds->ds_pending_deadlist); 397 dsl_deadlist_close(&ds->ds_deadlist); 398 kmem_free(ds, sizeof (dsl_dataset_t)); 399 dmu_buf_rele(dbuf, tag); 400 return (err); 401 } 402 403 if (!dsl_dataset_is_snapshot(ds)) { 404 ds->ds_snapname[0] = '\0'; 405 if (ds->ds_phys->ds_prev_snap_obj != 0) { 406 err = dsl_dataset_hold_obj(dp, 407 ds->ds_phys->ds_prev_snap_obj, 408 ds, &ds->ds_prev); 409 } 410 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 411 int zaperr = zap_lookup(mos, ds->ds_object, 412 DS_FIELD_BOOKMARK_NAMES, 413 sizeof (ds->ds_bookmarks), 1, 414 &ds->ds_bookmarks); 415 if (zaperr != ENOENT) 416 VERIFY0(zaperr); 417 } 418 } else { 419 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 420 err = dsl_dataset_get_snapname(ds); 421 if (err == 0 && ds->ds_phys->ds_userrefs_obj != 0) { 422 err = zap_count( 423 ds->ds_dir->dd_pool->dp_meta_objset, 424 ds->ds_phys->ds_userrefs_obj, 425 &ds->ds_userrefs); 426 } 427 } 428 429 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 430 err = dsl_prop_get_int_ds(ds, 431 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 432 &ds->ds_reserved); 433 if (err == 0) { 434 err = dsl_prop_get_int_ds(ds, 435 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 436 &ds->ds_quota); 437 } 438 } else { 439 ds->ds_reserved = ds->ds_quota = 0; 440 } 441 442 if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds, 443 &ds->ds_phys, dsl_dataset_evict)) != NULL) { 444 bplist_destroy(&ds->ds_pending_deadlist); 445 dsl_deadlist_close(&ds->ds_deadlist); 446 if (ds->ds_prev) 447 dsl_dataset_rele(ds->ds_prev, ds); 448 dsl_dir_rele(ds->ds_dir, ds); 449 mutex_destroy(&ds->ds_lock); 450 mutex_destroy(&ds->ds_opening_lock); 451 refcount_destroy(&ds->ds_longholds); 452 kmem_free(ds, sizeof (dsl_dataset_t)); 453 if (err != 0) { 454 dmu_buf_rele(dbuf, tag); 455 return (err); 456 } 457 ds = winner; 458 } else { 459 ds->ds_fsid_guid = 460 unique_insert(ds->ds_phys->ds_fsid_guid); 461 } 462 } 463 ASSERT3P(ds->ds_dbuf, ==, dbuf); 464 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 465 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || 466 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 467 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 468 *dsp = ds; 469 return (0); 470} 471 472int 473dsl_dataset_hold(dsl_pool_t *dp, const char *name, 474 void *tag, dsl_dataset_t **dsp) 475{ 476 dsl_dir_t *dd; 477 const char *snapname; 478 uint64_t obj; 479 int err = 0; 480 481 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 482 if (err != 0) 483 return (err); 484 485 ASSERT(dsl_pool_config_held(dp)); 486 obj = dd->dd_phys->dd_head_dataset_obj; 487 if (obj != 0) 488 err = dsl_dataset_hold_obj(dp, obj, tag, dsp); 489 else 490 err = SET_ERROR(ENOENT); 491 492 /* we may be looking for a snapshot */ 493 if (err == 0 && snapname != NULL) { 494 dsl_dataset_t *ds; 495 496 if (*snapname++ != '@') { 497 dsl_dataset_rele(*dsp, tag); 498 dsl_dir_rele(dd, FTAG); 499 return (SET_ERROR(ENOENT)); 500 } 501 502 dprintf("looking for snapshot '%s'\n", snapname); 503 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 504 if (err == 0) 505 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 506 dsl_dataset_rele(*dsp, tag); 507 508 if (err == 0) { 509 mutex_enter(&ds->ds_lock); 510 if (ds->ds_snapname[0] == 0) 511 (void) strlcpy(ds->ds_snapname, snapname, 512 sizeof (ds->ds_snapname)); 513 mutex_exit(&ds->ds_lock); 514 *dsp = ds; 515 } 516 } 517 518 dsl_dir_rele(dd, FTAG); 519 return (err); 520} 521 522int 523dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 524 void *tag, dsl_dataset_t **dsp) 525{ 526 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 527 if (err != 0) 528 return (err); 529 if (!dsl_dataset_tryown(*dsp, tag)) { 530 dsl_dataset_rele(*dsp, tag); 531 *dsp = NULL; 532 return (SET_ERROR(EBUSY)); 533 } 534 return (0); 535} 536 537int 538dsl_dataset_own(dsl_pool_t *dp, const char *name, 539 void *tag, dsl_dataset_t **dsp) 540{ 541 int err = dsl_dataset_hold(dp, name, tag, dsp); 542 if (err != 0) 543 return (err); 544 if (!dsl_dataset_tryown(*dsp, tag)) { 545 dsl_dataset_rele(*dsp, tag); 546 return (SET_ERROR(EBUSY)); 547 } 548 return (0); 549} 550 551/* 552 * See the comment above dsl_pool_hold() for details. In summary, a long 553 * hold is used to prevent destruction of a dataset while the pool hold 554 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 555 * 556 * The dataset and pool must be held when this function is called. After it 557 * is called, the pool hold may be released while the dataset is still held 558 * and accessed. 559 */ 560void 561dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 562{ 563 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 564 (void) refcount_add(&ds->ds_longholds, tag); 565} 566 567void 568dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 569{ 570 (void) refcount_remove(&ds->ds_longholds, tag); 571} 572 573/* Return B_TRUE if there are any long holds on this dataset. */ 574boolean_t 575dsl_dataset_long_held(dsl_dataset_t *ds) 576{ 577 return (!refcount_is_zero(&ds->ds_longholds)); 578} 579 580void 581dsl_dataset_name(dsl_dataset_t *ds, char *name) 582{ 583 if (ds == NULL) { 584 (void) strcpy(name, "mos"); 585 } else { 586 dsl_dir_name(ds->ds_dir, name); 587 VERIFY0(dsl_dataset_get_snapname(ds)); 588 if (ds->ds_snapname[0]) { 589 (void) strcat(name, "@"); 590 /* 591 * We use a "recursive" mutex so that we 592 * can call dprintf_ds() with ds_lock held. 593 */ 594 if (!MUTEX_HELD(&ds->ds_lock)) { 595 mutex_enter(&ds->ds_lock); 596 (void) strcat(name, ds->ds_snapname); 597 mutex_exit(&ds->ds_lock); 598 } else { 599 (void) strcat(name, ds->ds_snapname); 600 } 601 } 602 } 603} 604 605void 606dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 607{ 608 dmu_buf_rele(ds->ds_dbuf, tag); 609} 610 611void 612dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 613{ 614 ASSERT(ds->ds_owner == tag && ds->ds_dbuf != NULL); 615 616 mutex_enter(&ds->ds_lock); 617 ds->ds_owner = NULL; 618 mutex_exit(&ds->ds_lock); 619 dsl_dataset_long_rele(ds, tag); 620 if (ds->ds_dbuf != NULL) 621 dsl_dataset_rele(ds, tag); 622 else 623 dsl_dataset_evict(NULL, ds); 624} 625 626boolean_t 627dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 628{ 629 boolean_t gotit = FALSE; 630 631 mutex_enter(&ds->ds_lock); 632 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 633 ds->ds_owner = tag; 634 dsl_dataset_long_hold(ds, tag); 635 gotit = TRUE; 636 } 637 mutex_exit(&ds->ds_lock); 638 return (gotit); 639} 640 641uint64_t 642dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 643 uint64_t flags, dmu_tx_t *tx) 644{ 645 dsl_pool_t *dp = dd->dd_pool; 646 dmu_buf_t *dbuf; 647 dsl_dataset_phys_t *dsphys; 648 uint64_t dsobj; 649 objset_t *mos = dp->dp_meta_objset; 650 651 if (origin == NULL) 652 origin = dp->dp_origin_snap; 653 654 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 655 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 656 ASSERT(dmu_tx_is_syncing(tx)); 657 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 658 659 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 660 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 661 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 662 dmu_buf_will_dirty(dbuf, tx); 663 dsphys = dbuf->db_data; 664 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 665 dsphys->ds_dir_obj = dd->dd_object; 666 dsphys->ds_flags = flags; 667 dsphys->ds_fsid_guid = unique_create(); 668 do { 669 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 670 sizeof (dsphys->ds_guid)); 671 } while (dsphys->ds_guid == 0); 672 dsphys->ds_snapnames_zapobj = 673 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 674 DMU_OT_NONE, 0, tx); 675 dsphys->ds_creation_time = gethrestime_sec(); 676 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 677 678 if (origin == NULL) { 679 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 680 } else { 681 dsl_dataset_t *ohds; /* head of the origin snapshot */ 682 683 dsphys->ds_prev_snap_obj = origin->ds_object; 684 dsphys->ds_prev_snap_txg = 685 origin->ds_phys->ds_creation_txg; 686 dsphys->ds_referenced_bytes = 687 origin->ds_phys->ds_referenced_bytes; 688 dsphys->ds_compressed_bytes = 689 origin->ds_phys->ds_compressed_bytes; 690 dsphys->ds_uncompressed_bytes = 691 origin->ds_phys->ds_uncompressed_bytes; 692 dsphys->ds_bp = origin->ds_phys->ds_bp; 693 dsphys->ds_flags |= origin->ds_phys->ds_flags; 694 695 dmu_buf_will_dirty(origin->ds_dbuf, tx); 696 origin->ds_phys->ds_num_children++; 697 698 VERIFY0(dsl_dataset_hold_obj(dp, 699 origin->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ohds)); 700 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 701 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 702 dsl_dataset_rele(ohds, FTAG); 703 704 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 705 if (origin->ds_phys->ds_next_clones_obj == 0) { 706 origin->ds_phys->ds_next_clones_obj = 707 zap_create(mos, 708 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 709 } 710 VERIFY0(zap_add_int(mos, 711 origin->ds_phys->ds_next_clones_obj, dsobj, tx)); 712 } 713 714 dmu_buf_will_dirty(dd->dd_dbuf, tx); 715 dd->dd_phys->dd_origin_obj = origin->ds_object; 716 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 717 if (origin->ds_dir->dd_phys->dd_clones == 0) { 718 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 719 origin->ds_dir->dd_phys->dd_clones = 720 zap_create(mos, 721 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 722 } 723 VERIFY0(zap_add_int(mos, 724 origin->ds_dir->dd_phys->dd_clones, dsobj, tx)); 725 } 726 } 727 728 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 729 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 730 731 dmu_buf_rele(dbuf, FTAG); 732 733 dmu_buf_will_dirty(dd->dd_dbuf, tx); 734 dd->dd_phys->dd_head_dataset_obj = dsobj; 735 736 return (dsobj); 737} 738 739static void 740dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 741{ 742 objset_t *os; 743 744 VERIFY0(dmu_objset_from_ds(ds, &os)); 745 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 746 dsl_dataset_dirty(ds, tx); 747} 748 749uint64_t 750dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 751 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 752{ 753 dsl_pool_t *dp = pdd->dd_pool; 754 uint64_t dsobj, ddobj; 755 dsl_dir_t *dd; 756 757 ASSERT(dmu_tx_is_syncing(tx)); 758 ASSERT(lastname[0] != '@'); 759 760 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 761 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 762 763 dsobj = dsl_dataset_create_sync_dd(dd, origin, 764 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 765 766 dsl_deleg_set_create_perms(dd, tx, cr); 767 768 dsl_dir_rele(dd, FTAG); 769 770 /* 771 * If we are creating a clone, make sure we zero out any stale 772 * data from the origin snapshots zil header. 773 */ 774 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 775 dsl_dataset_t *ds; 776 777 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 778 dsl_dataset_zero_zil(ds, tx); 779 dsl_dataset_rele(ds, FTAG); 780 } 781 782 return (dsobj); 783} 784 785#ifdef __FreeBSD__ 786/* FreeBSD ioctl compat begin */ 787struct destroyarg { 788 nvlist_t *nvl; 789 const char *snapname; 790}; 791 792static int 793dsl_check_snap_cb(const char *name, void *arg) 794{ 795 struct destroyarg *da = arg; 796 dsl_dataset_t *ds; 797 char *dsname; 798 799 dsname = kmem_asprintf("%s@%s", name, da->snapname); 800 fnvlist_add_boolean(da->nvl, dsname); 801 kmem_free(dsname, strlen(dsname) + 1); 802 803 return (0); 804} 805 806int 807dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 808 nvlist_t *snaps) 809{ 810 struct destroyarg *da; 811 int err; 812 813 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 814 da->nvl = snaps; 815 da->snapname = snapname; 816 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 817 DS_FIND_CHILDREN); 818 kmem_free(da, sizeof (struct destroyarg)); 819 820 return (err); 821} 822/* FreeBSD ioctl compat end */ 823#endif /* __FreeBSD__ */ 824 825/* 826 * The unique space in the head dataset can be calculated by subtracting 827 * the space used in the most recent snapshot, that is still being used 828 * in this file system, from the space currently in use. To figure out 829 * the space in the most recent snapshot still in use, we need to take 830 * the total space used in the snapshot and subtract out the space that 831 * has been freed up since the snapshot was taken. 832 */ 833void 834dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 835{ 836 uint64_t mrs_used; 837 uint64_t dlused, dlcomp, dluncomp; 838 839 ASSERT(!dsl_dataset_is_snapshot(ds)); 840 841 if (ds->ds_phys->ds_prev_snap_obj != 0) 842 mrs_used = ds->ds_prev->ds_phys->ds_referenced_bytes; 843 else 844 mrs_used = 0; 845 846 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 847 848 ASSERT3U(dlused, <=, mrs_used); 849 ds->ds_phys->ds_unique_bytes = 850 ds->ds_phys->ds_referenced_bytes - (mrs_used - dlused); 851 852 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 853 SPA_VERSION_UNIQUE_ACCURATE) 854 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 855} 856 857void 858dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 859 dmu_tx_t *tx) 860{ 861 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 862 uint64_t count; 863 int err; 864 865 ASSERT(ds->ds_phys->ds_num_children >= 2); 866 err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx); 867 /* 868 * The err should not be ENOENT, but a bug in a previous version 869 * of the code could cause upgrade_clones_cb() to not set 870 * ds_next_snap_obj when it should, leading to a missing entry. 871 * If we knew that the pool was created after 872 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 873 * ENOENT. However, at least we can check that we don't have 874 * too many entries in the next_clones_obj even after failing to 875 * remove this one. 876 */ 877 if (err != ENOENT) 878 VERIFY0(err); 879 ASSERT0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 880 &count)); 881 ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2); 882} 883 884 885blkptr_t * 886dsl_dataset_get_blkptr(dsl_dataset_t *ds) 887{ 888 return (&ds->ds_phys->ds_bp); 889} 890 891void 892dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 893{ 894 ASSERT(dmu_tx_is_syncing(tx)); 895 /* If it's the meta-objset, set dp_meta_rootbp */ 896 if (ds == NULL) { 897 tx->tx_pool->dp_meta_rootbp = *bp; 898 } else { 899 dmu_buf_will_dirty(ds->ds_dbuf, tx); 900 ds->ds_phys->ds_bp = *bp; 901 } 902} 903 904spa_t * 905dsl_dataset_get_spa(dsl_dataset_t *ds) 906{ 907 return (ds->ds_dir->dd_pool->dp_spa); 908} 909 910void 911dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 912{ 913 dsl_pool_t *dp; 914 915 if (ds == NULL) /* this is the meta-objset */ 916 return; 917 918 ASSERT(ds->ds_objset != NULL); 919 920 if (ds->ds_phys->ds_next_snap_obj != 0) 921 panic("dirtying snapshot!"); 922 923 dp = ds->ds_dir->dd_pool; 924 925 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 926 /* up the hold count until we can be written out */ 927 dmu_buf_add_ref(ds->ds_dbuf, ds); 928 } 929} 930 931boolean_t 932dsl_dataset_is_dirty(dsl_dataset_t *ds) 933{ 934 for (int t = 0; t < TXG_SIZE; t++) { 935 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 936 ds, t)) 937 return (B_TRUE); 938 } 939 return (B_FALSE); 940} 941 942static int 943dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 944{ 945 uint64_t asize; 946 947 if (!dmu_tx_is_syncing(tx)) 948 return (0); 949 950 /* 951 * If there's an fs-only reservation, any blocks that might become 952 * owned by the snapshot dataset must be accommodated by space 953 * outside of the reservation. 954 */ 955 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 956 asize = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 957 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 958 return (SET_ERROR(ENOSPC)); 959 960 /* 961 * Propagate any reserved space for this snapshot to other 962 * snapshot checks in this sync group. 963 */ 964 if (asize > 0) 965 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 966 967 return (0); 968} 969 970typedef struct dsl_dataset_snapshot_arg { 971 nvlist_t *ddsa_snaps; 972 nvlist_t *ddsa_props; 973 nvlist_t *ddsa_errors; 974} dsl_dataset_snapshot_arg_t; 975 976int 977dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 978 dmu_tx_t *tx, boolean_t recv) 979{ 980 int error; 981 uint64_t value; 982 983 ds->ds_trysnap_txg = tx->tx_txg; 984 985 if (!dmu_tx_is_syncing(tx)) 986 return (0); 987 988 /* 989 * We don't allow multiple snapshots of the same txg. If there 990 * is already one, try again. 991 */ 992 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 993 return (SET_ERROR(EAGAIN)); 994 995 /* 996 * Check for conflicting snapshot name. 997 */ 998 error = dsl_dataset_snap_lookup(ds, snapname, &value); 999 if (error == 0) 1000 return (SET_ERROR(EEXIST)); 1001 if (error != ENOENT) 1002 return (error); 1003 1004 /* 1005 * We don't allow taking snapshots of inconsistent datasets, such as 1006 * those into which we are currently receiving. However, if we are 1007 * creating this snapshot as part of a receive, this check will be 1008 * executed atomically with respect to the completion of the receive 1009 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1010 * case we ignore this, knowing it will be fixed up for us shortly in 1011 * dmu_recv_end_sync(). 1012 */ 1013 if (!recv && DS_IS_INCONSISTENT(ds)) 1014 return (SET_ERROR(EBUSY)); 1015 1016 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1017 if (error != 0) 1018 return (error); 1019 1020 return (0); 1021} 1022 1023static int 1024dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1025{ 1026 dsl_dataset_snapshot_arg_t *ddsa = arg; 1027 dsl_pool_t *dp = dmu_tx_pool(tx); 1028 nvpair_t *pair; 1029 int rv = 0; 1030 1031 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1032 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1033 int error = 0; 1034 dsl_dataset_t *ds; 1035 char *name, *atp; 1036 char dsname[MAXNAMELEN]; 1037 1038 name = nvpair_name(pair); 1039 if (strlen(name) >= MAXNAMELEN) 1040 error = SET_ERROR(ENAMETOOLONG); 1041 if (error == 0) { 1042 atp = strchr(name, '@'); 1043 if (atp == NULL) 1044 error = SET_ERROR(EINVAL); 1045 if (error == 0) 1046 (void) strlcpy(dsname, name, atp - name + 1); 1047 } 1048 if (error == 0) 1049 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1050 if (error == 0) { 1051 error = dsl_dataset_snapshot_check_impl(ds, 1052 atp + 1, tx, B_FALSE); 1053 dsl_dataset_rele(ds, FTAG); 1054 } 1055 1056 if (error != 0) { 1057 if (ddsa->ddsa_errors != NULL) { 1058 fnvlist_add_int32(ddsa->ddsa_errors, 1059 name, error); 1060 } 1061 rv = error; 1062 } 1063 } 1064 return (rv); 1065} 1066 1067void 1068dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1069 dmu_tx_t *tx) 1070{ 1071 static zil_header_t zero_zil; 1072 1073 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1074 dmu_buf_t *dbuf; 1075 dsl_dataset_phys_t *dsphys; 1076 uint64_t dsobj, crtxg; 1077 objset_t *mos = dp->dp_meta_objset; 1078 objset_t *os; 1079 1080 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1081 1082 /* 1083 * If we are on an old pool, the zil must not be active, in which 1084 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1085 */ 1086 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1087 dmu_objset_from_ds(ds, &os) != 0 || 1088 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1089 sizeof (zero_zil)) == 0); 1090 1091 1092 /* 1093 * The origin's ds_creation_txg has to be < TXG_INITIAL 1094 */ 1095 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1096 crtxg = 1; 1097 else 1098 crtxg = tx->tx_txg; 1099 1100 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1101 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1102 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1103 dmu_buf_will_dirty(dbuf, tx); 1104 dsphys = dbuf->db_data; 1105 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1106 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1107 dsphys->ds_fsid_guid = unique_create(); 1108 do { 1109 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1110 sizeof (dsphys->ds_guid)); 1111 } while (dsphys->ds_guid == 0); 1112 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1113 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1114 dsphys->ds_next_snap_obj = ds->ds_object; 1115 dsphys->ds_num_children = 1; 1116 dsphys->ds_creation_time = gethrestime_sec(); 1117 dsphys->ds_creation_txg = crtxg; 1118 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1119 dsphys->ds_referenced_bytes = ds->ds_phys->ds_referenced_bytes; 1120 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1121 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1122 dsphys->ds_flags = ds->ds_phys->ds_flags; 1123 dsphys->ds_bp = ds->ds_phys->ds_bp; 1124 dmu_buf_rele(dbuf, FTAG); 1125 1126 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1127 if (ds->ds_prev) { 1128 uint64_t next_clones_obj = 1129 ds->ds_prev->ds_phys->ds_next_clones_obj; 1130 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1131 ds->ds_object || 1132 ds->ds_prev->ds_phys->ds_num_children > 1); 1133 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1134 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1135 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1136 ds->ds_prev->ds_phys->ds_creation_txg); 1137 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1138 } else if (next_clones_obj != 0) { 1139 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1140 dsphys->ds_next_snap_obj, tx); 1141 VERIFY0(zap_add_int(mos, 1142 next_clones_obj, dsobj, tx)); 1143 } 1144 } 1145 1146 /* 1147 * If we have a reference-reservation on this dataset, we will 1148 * need to increase the amount of refreservation being charged 1149 * since our unique space is going to zero. 1150 */ 1151 if (ds->ds_reserved) { 1152 int64_t delta; 1153 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1154 delta = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 1155 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1156 delta, 0, 0, tx); 1157 } 1158 1159 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1160 ds->ds_phys->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist, 1161 UINT64_MAX, ds->ds_phys->ds_prev_snap_obj, tx); 1162 dsl_deadlist_close(&ds->ds_deadlist); 1163 dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj); 1164 dsl_deadlist_add_key(&ds->ds_deadlist, 1165 ds->ds_phys->ds_prev_snap_txg, tx); 1166 1167 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1168 ds->ds_phys->ds_prev_snap_obj = dsobj; 1169 ds->ds_phys->ds_prev_snap_txg = crtxg; 1170 ds->ds_phys->ds_unique_bytes = 0; 1171 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1172 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1173 1174 VERIFY0(zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1175 snapname, 8, 1, &dsobj, tx)); 1176 1177 if (ds->ds_prev) 1178 dsl_dataset_rele(ds->ds_prev, ds); 1179 VERIFY0(dsl_dataset_hold_obj(dp, 1180 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1181 1182 dsl_scan_ds_snapshotted(ds, tx); 1183 1184 dsl_dir_snap_cmtime_update(ds->ds_dir); 1185 1186 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1187} 1188 1189static void 1190dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1191{ 1192 dsl_dataset_snapshot_arg_t *ddsa = arg; 1193 dsl_pool_t *dp = dmu_tx_pool(tx); 1194 nvpair_t *pair; 1195 1196 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1197 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1198 dsl_dataset_t *ds; 1199 char *name, *atp; 1200 char dsname[MAXNAMELEN]; 1201 1202 name = nvpair_name(pair); 1203 atp = strchr(name, '@'); 1204 (void) strlcpy(dsname, name, atp - name + 1); 1205 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1206 1207 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1208 if (ddsa->ddsa_props != NULL) { 1209 dsl_props_set_sync_impl(ds->ds_prev, 1210 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1211 } 1212 dsl_dataset_rele(ds, FTAG); 1213 } 1214} 1215 1216/* 1217 * The snapshots must all be in the same pool. 1218 * All-or-nothing: if there are any failures, nothing will be modified. 1219 */ 1220int 1221dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1222{ 1223 dsl_dataset_snapshot_arg_t ddsa; 1224 nvpair_t *pair; 1225 boolean_t needsuspend; 1226 int error; 1227 spa_t *spa; 1228 char *firstname; 1229 nvlist_t *suspended = NULL; 1230 1231 pair = nvlist_next_nvpair(snaps, NULL); 1232 if (pair == NULL) 1233 return (0); 1234 firstname = nvpair_name(pair); 1235 1236 error = spa_open(firstname, &spa, FTAG); 1237 if (error != 0) 1238 return (error); 1239 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1240 spa_close(spa, FTAG); 1241 1242 if (needsuspend) { 1243 suspended = fnvlist_alloc(); 1244 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1245 pair = nvlist_next_nvpair(snaps, pair)) { 1246 char fsname[MAXNAMELEN]; 1247 char *snapname = nvpair_name(pair); 1248 char *atp; 1249 void *cookie; 1250 1251 atp = strchr(snapname, '@'); 1252 if (atp == NULL) { 1253 error = SET_ERROR(EINVAL); 1254 break; 1255 } 1256 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1257 1258 error = zil_suspend(fsname, &cookie); 1259 if (error != 0) 1260 break; 1261 fnvlist_add_uint64(suspended, fsname, 1262 (uintptr_t)cookie); 1263 } 1264 } 1265 1266 ddsa.ddsa_snaps = snaps; 1267 ddsa.ddsa_props = props; 1268 ddsa.ddsa_errors = errors; 1269 1270 if (error == 0) { 1271 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1272 dsl_dataset_snapshot_sync, &ddsa, 1273 fnvlist_num_pairs(snaps) * 3); 1274 } 1275 1276 if (suspended != NULL) { 1277 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1278 pair = nvlist_next_nvpair(suspended, pair)) { 1279 zil_resume((void *)(uintptr_t) 1280 fnvpair_value_uint64(pair)); 1281 } 1282 fnvlist_free(suspended); 1283 } 1284 1285#ifdef __FreeBSD__ 1286#ifdef _KERNEL 1287 if (error == 0) { 1288 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1289 pair = nvlist_next_nvpair(snaps, pair)) { 1290 char *snapname = nvpair_name(pair); 1291 zvol_create_minors(snapname); 1292 } 1293 } 1294#endif 1295#endif 1296 return (error); 1297} 1298 1299typedef struct dsl_dataset_snapshot_tmp_arg { 1300 const char *ddsta_fsname; 1301 const char *ddsta_snapname; 1302 minor_t ddsta_cleanup_minor; 1303 const char *ddsta_htag; 1304} dsl_dataset_snapshot_tmp_arg_t; 1305 1306static int 1307dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1308{ 1309 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1310 dsl_pool_t *dp = dmu_tx_pool(tx); 1311 dsl_dataset_t *ds; 1312 int error; 1313 1314 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1315 if (error != 0) 1316 return (error); 1317 1318 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1319 tx, B_FALSE); 1320 if (error != 0) { 1321 dsl_dataset_rele(ds, FTAG); 1322 return (error); 1323 } 1324 1325 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1326 dsl_dataset_rele(ds, FTAG); 1327 return (SET_ERROR(ENOTSUP)); 1328 } 1329 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1330 B_TRUE, tx); 1331 if (error != 0) { 1332 dsl_dataset_rele(ds, FTAG); 1333 return (error); 1334 } 1335 1336 dsl_dataset_rele(ds, FTAG); 1337 return (0); 1338} 1339 1340static void 1341dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1342{ 1343 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1344 dsl_pool_t *dp = dmu_tx_pool(tx); 1345 dsl_dataset_t *ds; 1346 1347 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1348 1349 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1350 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1351 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1352 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1353 1354 dsl_dataset_rele(ds, FTAG); 1355} 1356 1357int 1358dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1359 minor_t cleanup_minor, const char *htag) 1360{ 1361 dsl_dataset_snapshot_tmp_arg_t ddsta; 1362 int error; 1363 spa_t *spa; 1364 boolean_t needsuspend; 1365 void *cookie; 1366 1367 ddsta.ddsta_fsname = fsname; 1368 ddsta.ddsta_snapname = snapname; 1369 ddsta.ddsta_cleanup_minor = cleanup_minor; 1370 ddsta.ddsta_htag = htag; 1371 1372 error = spa_open(fsname, &spa, FTAG); 1373 if (error != 0) 1374 return (error); 1375 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1376 spa_close(spa, FTAG); 1377 1378 if (needsuspend) { 1379 error = zil_suspend(fsname, &cookie); 1380 if (error != 0) 1381 return (error); 1382 } 1383 1384 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1385 dsl_dataset_snapshot_tmp_sync, &ddsta, 3); 1386 1387 if (needsuspend) 1388 zil_resume(cookie); 1389 return (error); 1390} 1391 1392 1393void 1394dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1395{ 1396 ASSERT(dmu_tx_is_syncing(tx)); 1397 ASSERT(ds->ds_objset != NULL); 1398 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1399 1400 /* 1401 * in case we had to change ds_fsid_guid when we opened it, 1402 * sync it out now. 1403 */ 1404 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1405 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1406 1407 dmu_objset_sync(ds->ds_objset, zio, tx); 1408} 1409 1410static void 1411get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1412{ 1413 uint64_t count = 0; 1414 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1415 zap_cursor_t zc; 1416 zap_attribute_t za; 1417 nvlist_t *propval = fnvlist_alloc(); 1418 nvlist_t *val = fnvlist_alloc(); 1419 1420 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1421 1422 /* 1423 * There may be missing entries in ds_next_clones_obj 1424 * due to a bug in a previous version of the code. 1425 * Only trust it if it has the right number of entries. 1426 */ 1427 if (ds->ds_phys->ds_next_clones_obj != 0) { 1428 VERIFY0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 1429 &count)); 1430 } 1431 if (count != ds->ds_phys->ds_num_children - 1) 1432 goto fail; 1433 for (zap_cursor_init(&zc, mos, ds->ds_phys->ds_next_clones_obj); 1434 zap_cursor_retrieve(&zc, &za) == 0; 1435 zap_cursor_advance(&zc)) { 1436 dsl_dataset_t *clone; 1437 char buf[ZFS_MAXNAMELEN]; 1438 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1439 za.za_first_integer, FTAG, &clone)); 1440 dsl_dir_name(clone->ds_dir, buf); 1441 fnvlist_add_boolean(val, buf); 1442 dsl_dataset_rele(clone, FTAG); 1443 } 1444 zap_cursor_fini(&zc); 1445 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1446 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1447fail: 1448 nvlist_free(val); 1449 nvlist_free(propval); 1450} 1451 1452void 1453dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1454{ 1455 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1456 uint64_t refd, avail, uobjs, aobjs, ratio; 1457 1458 ASSERT(dsl_pool_config_held(dp)); 1459 1460 ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1461 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1462 ds->ds_phys->ds_compressed_bytes); 1463 1464 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1465 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1466 ds->ds_phys->ds_uncompressed_bytes); 1467 1468 if (dsl_dataset_is_snapshot(ds)) { 1469 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1470 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1471 ds->ds_phys->ds_unique_bytes); 1472 get_clones_stat(ds, nv); 1473 } else { 1474 dsl_dir_stats(ds->ds_dir, nv); 1475 } 1476 1477 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1478 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1479 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1480 1481 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1482 ds->ds_phys->ds_creation_time); 1483 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1484 ds->ds_phys->ds_creation_txg); 1485 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1486 ds->ds_quota); 1487 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1488 ds->ds_reserved); 1489 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1490 ds->ds_phys->ds_guid); 1491 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1492 ds->ds_phys->ds_unique_bytes); 1493 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1494 ds->ds_object); 1495 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1496 ds->ds_userrefs); 1497 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1498 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1499 1500 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1501 uint64_t written, comp, uncomp; 1502 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1503 dsl_dataset_t *prev; 1504 1505 int err = dsl_dataset_hold_obj(dp, 1506 ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 1507 if (err == 0) { 1508 err = dsl_dataset_space_written(prev, ds, &written, 1509 &comp, &uncomp); 1510 dsl_dataset_rele(prev, FTAG); 1511 if (err == 0) { 1512 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1513 written); 1514 } 1515 } 1516 } 1517} 1518 1519void 1520dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1521{ 1522 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1523 ASSERT(dsl_pool_config_held(dp)); 1524 1525 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1526 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1527 stat->dds_guid = ds->ds_phys->ds_guid; 1528 stat->dds_origin[0] = '\0'; 1529 if (dsl_dataset_is_snapshot(ds)) { 1530 stat->dds_is_snapshot = B_TRUE; 1531 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1532 } else { 1533 stat->dds_is_snapshot = B_FALSE; 1534 stat->dds_num_clones = 0; 1535 1536 if (dsl_dir_is_clone(ds->ds_dir)) { 1537 dsl_dataset_t *ods; 1538 1539 VERIFY0(dsl_dataset_hold_obj(dp, 1540 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1541 dsl_dataset_name(ods, stat->dds_origin); 1542 dsl_dataset_rele(ods, FTAG); 1543 } 1544 } 1545} 1546 1547uint64_t 1548dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1549{ 1550 return (ds->ds_fsid_guid); 1551} 1552 1553void 1554dsl_dataset_space(dsl_dataset_t *ds, 1555 uint64_t *refdbytesp, uint64_t *availbytesp, 1556 uint64_t *usedobjsp, uint64_t *availobjsp) 1557{ 1558 *refdbytesp = ds->ds_phys->ds_referenced_bytes; 1559 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1560 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1561 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1562 if (ds->ds_quota != 0) { 1563 /* 1564 * Adjust available bytes according to refquota 1565 */ 1566 if (*refdbytesp < ds->ds_quota) 1567 *availbytesp = MIN(*availbytesp, 1568 ds->ds_quota - *refdbytesp); 1569 else 1570 *availbytesp = 0; 1571 } 1572 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 1573 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1574} 1575 1576boolean_t 1577dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1578{ 1579 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1580 1581 ASSERT(dsl_pool_config_held(dp)); 1582 if (snap == NULL) 1583 return (B_FALSE); 1584 if (ds->ds_phys->ds_bp.blk_birth > 1585 snap->ds_phys->ds_creation_txg) { 1586 objset_t *os, *os_snap; 1587 /* 1588 * It may be that only the ZIL differs, because it was 1589 * reset in the head. Don't count that as being 1590 * modified. 1591 */ 1592 if (dmu_objset_from_ds(ds, &os) != 0) 1593 return (B_TRUE); 1594 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1595 return (B_TRUE); 1596 return (bcmp(&os->os_phys->os_meta_dnode, 1597 &os_snap->os_phys->os_meta_dnode, 1598 sizeof (os->os_phys->os_meta_dnode)) != 0); 1599 } 1600 return (B_FALSE); 1601} 1602 1603typedef struct dsl_dataset_rename_snapshot_arg { 1604 const char *ddrsa_fsname; 1605 const char *ddrsa_oldsnapname; 1606 const char *ddrsa_newsnapname; 1607 boolean_t ddrsa_recursive; 1608 dmu_tx_t *ddrsa_tx; 1609} dsl_dataset_rename_snapshot_arg_t; 1610 1611/* ARGSUSED */ 1612static int 1613dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1614 dsl_dataset_t *hds, void *arg) 1615{ 1616 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1617 int error; 1618 uint64_t val; 1619 1620 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1621 if (error != 0) { 1622 /* ignore nonexistent snapshots */ 1623 return (error == ENOENT ? 0 : error); 1624 } 1625 1626 /* new name should not exist */ 1627 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1628 if (error == 0) 1629 error = SET_ERROR(EEXIST); 1630 else if (error == ENOENT) 1631 error = 0; 1632 1633 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1634 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1635 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 1636 error = SET_ERROR(ENAMETOOLONG); 1637 1638 return (error); 1639} 1640 1641static int 1642dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1643{ 1644 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1645 dsl_pool_t *dp = dmu_tx_pool(tx); 1646 dsl_dataset_t *hds; 1647 int error; 1648 1649 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1650 if (error != 0) 1651 return (error); 1652 1653 if (ddrsa->ddrsa_recursive) { 1654 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1655 dsl_dataset_rename_snapshot_check_impl, ddrsa, 1656 DS_FIND_CHILDREN); 1657 } else { 1658 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 1659 } 1660 dsl_dataset_rele(hds, FTAG); 1661 return (error); 1662} 1663 1664static int 1665dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 1666 dsl_dataset_t *hds, void *arg) 1667{ 1668#ifdef __FreeBSD__ 1669#ifdef _KERNEL 1670 char *oldname, *newname; 1671#endif 1672#endif 1673 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1674 dsl_dataset_t *ds; 1675 uint64_t val; 1676 dmu_tx_t *tx = ddrsa->ddrsa_tx; 1677 int error; 1678 1679 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1680 ASSERT(error == 0 || error == ENOENT); 1681 if (error == ENOENT) { 1682 /* ignore nonexistent snapshots */ 1683 return (0); 1684 } 1685 1686 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 1687 1688 /* log before we change the name */ 1689 spa_history_log_internal_ds(ds, "rename", tx, 1690 "-> @%s", ddrsa->ddrsa_newsnapname); 1691 1692 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx)); 1693 mutex_enter(&ds->ds_lock); 1694 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 1695 mutex_exit(&ds->ds_lock); 1696 VERIFY0(zap_add(dp->dp_meta_objset, hds->ds_phys->ds_snapnames_zapobj, 1697 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 1698 1699#ifdef __FreeBSD__ 1700#ifdef _KERNEL 1701 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1702 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1703 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1704 ddrsa->ddrsa_oldsnapname); 1705 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 1706 ddrsa->ddrsa_newsnapname); 1707 zfsvfs_update_fromname(oldname, newname); 1708 zvol_rename_minors(oldname, newname); 1709 kmem_free(newname, MAXPATHLEN); 1710 kmem_free(oldname, MAXPATHLEN); 1711#endif 1712#endif 1713 dsl_dataset_rele(ds, FTAG); 1714 1715 return (0); 1716} 1717 1718static void 1719dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 1720{ 1721 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1722 dsl_pool_t *dp = dmu_tx_pool(tx); 1723 dsl_dataset_t *hds; 1724 1725 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 1726 ddrsa->ddrsa_tx = tx; 1727 if (ddrsa->ddrsa_recursive) { 1728 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1729 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 1730 DS_FIND_CHILDREN)); 1731 } else { 1732 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 1733 } 1734 dsl_dataset_rele(hds, FTAG); 1735} 1736 1737int 1738dsl_dataset_rename_snapshot(const char *fsname, 1739 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 1740{ 1741 dsl_dataset_rename_snapshot_arg_t ddrsa; 1742 1743 ddrsa.ddrsa_fsname = fsname; 1744 ddrsa.ddrsa_oldsnapname = oldsnapname; 1745 ddrsa.ddrsa_newsnapname = newsnapname; 1746 ddrsa.ddrsa_recursive = recursive; 1747 1748 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 1749 dsl_dataset_rename_snapshot_sync, &ddrsa, 1)); 1750} 1751 1752/* 1753 * If we're doing an ownership handoff, we need to make sure that there is 1754 * only one long hold on the dataset. We're not allowed to change anything here 1755 * so we don't permanently release the long hold or regular hold here. We want 1756 * to do this only when syncing to avoid the dataset unexpectedly going away 1757 * when we release the long hold. 1758 */ 1759static int 1760dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 1761{ 1762 boolean_t held; 1763 1764 if (!dmu_tx_is_syncing(tx)) 1765 return (0); 1766 1767 if (owner != NULL) { 1768 VERIFY3P(ds->ds_owner, ==, owner); 1769 dsl_dataset_long_rele(ds, owner); 1770 } 1771 1772 held = dsl_dataset_long_held(ds); 1773 1774 if (owner != NULL) 1775 dsl_dataset_long_hold(ds, owner); 1776 1777 if (held) 1778 return (SET_ERROR(EBUSY)); 1779 1780 return (0); 1781} 1782 1783typedef struct dsl_dataset_rollback_arg { 1784 const char *ddra_fsname; 1785 void *ddra_owner; 1786 nvlist_t *ddra_result; 1787} dsl_dataset_rollback_arg_t; 1788 1789static int 1790dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 1791{ 1792 dsl_dataset_rollback_arg_t *ddra = arg; 1793 dsl_pool_t *dp = dmu_tx_pool(tx); 1794 dsl_dataset_t *ds; 1795 int64_t unused_refres_delta; 1796 int error; 1797 1798 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 1799 if (error != 0) 1800 return (error); 1801 1802 /* must not be a snapshot */ 1803 if (dsl_dataset_is_snapshot(ds)) { 1804 dsl_dataset_rele(ds, FTAG); 1805 return (SET_ERROR(EINVAL)); 1806 } 1807 1808 /* must have a most recent snapshot */ 1809 if (ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) { 1810 dsl_dataset_rele(ds, FTAG); 1811 return (SET_ERROR(EINVAL)); 1812 } 1813 1814 /* must not have any bookmarks after the most recent snapshot */ 1815 nvlist_t *proprequest = fnvlist_alloc(); 1816 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 1817 nvlist_t *bookmarks = fnvlist_alloc(); 1818 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 1819 fnvlist_free(proprequest); 1820 if (error != 0) 1821 return (error); 1822 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 1823 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 1824 nvlist_t *valuenv = 1825 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 1826 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 1827 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 1828 if (createtxg > ds->ds_phys->ds_prev_snap_txg) { 1829 fnvlist_free(bookmarks); 1830 dsl_dataset_rele(ds, FTAG); 1831 return (SET_ERROR(EEXIST)); 1832 } 1833 } 1834 fnvlist_free(bookmarks); 1835 1836 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 1837 if (error != 0) { 1838 dsl_dataset_rele(ds, FTAG); 1839 return (error); 1840 } 1841 1842 /* 1843 * Check if the snap we are rolling back to uses more than 1844 * the refquota. 1845 */ 1846 if (ds->ds_quota != 0 && 1847 ds->ds_prev->ds_phys->ds_referenced_bytes > ds->ds_quota) { 1848 dsl_dataset_rele(ds, FTAG); 1849 return (SET_ERROR(EDQUOT)); 1850 } 1851 1852 /* 1853 * When we do the clone swap, we will temporarily use more space 1854 * due to the refreservation (the head will no longer have any 1855 * unique space, so the entire amount of the refreservation will need 1856 * to be free). We will immediately destroy the clone, freeing 1857 * this space, but the freeing happens over many txg's. 1858 */ 1859 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 1860 ds->ds_phys->ds_unique_bytes); 1861 1862 if (unused_refres_delta > 0 && 1863 unused_refres_delta > 1864 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 1865 dsl_dataset_rele(ds, FTAG); 1866 return (SET_ERROR(ENOSPC)); 1867 } 1868 1869 dsl_dataset_rele(ds, FTAG); 1870 return (0); 1871} 1872 1873static void 1874dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 1875{ 1876 dsl_dataset_rollback_arg_t *ddra = arg; 1877 dsl_pool_t *dp = dmu_tx_pool(tx); 1878 dsl_dataset_t *ds, *clone; 1879 uint64_t cloneobj; 1880 char namebuf[ZFS_MAXNAMELEN]; 1881 1882 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 1883 1884 dsl_dataset_name(ds->ds_prev, namebuf); 1885 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 1886 1887 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 1888 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 1889 1890 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 1891 1892 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 1893 dsl_dataset_zero_zil(ds, tx); 1894 1895 dsl_destroy_head_sync_impl(clone, tx); 1896 1897 dsl_dataset_rele(clone, FTAG); 1898 dsl_dataset_rele(ds, FTAG); 1899} 1900 1901/* 1902 * Rolls back the given filesystem or volume to the most recent snapshot. 1903 * The name of the most recent snapshot will be returned under key "target" 1904 * in the result nvlist. 1905 * 1906 * If owner != NULL: 1907 * - The existing dataset MUST be owned by the specified owner at entry 1908 * - Upon return, dataset will still be held by the same owner, whether we 1909 * succeed or not. 1910 * 1911 * This mode is required any time the existing filesystem is mounted. See 1912 * notes above zfs_suspend_fs() for further details. 1913 */ 1914int 1915dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 1916{ 1917 dsl_dataset_rollback_arg_t ddra; 1918 1919 ddra.ddra_fsname = fsname; 1920 ddra.ddra_owner = owner; 1921 ddra.ddra_result = result; 1922 1923 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 1924 dsl_dataset_rollback_sync, &ddra, 1)); 1925} 1926 1927struct promotenode { 1928 list_node_t link; 1929 dsl_dataset_t *ds; 1930}; 1931 1932typedef struct dsl_dataset_promote_arg { 1933 const char *ddpa_clonename; 1934 dsl_dataset_t *ddpa_clone; 1935 list_t shared_snaps, origin_snaps, clone_snaps; 1936 dsl_dataset_t *origin_origin; /* origin of the origin */ 1937 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 1938 char *err_ds; 1939} dsl_dataset_promote_arg_t; 1940 1941static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 1942static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 1943 void *tag); 1944static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 1945 1946static int 1947dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 1948{ 1949 dsl_dataset_promote_arg_t *ddpa = arg; 1950 dsl_pool_t *dp = dmu_tx_pool(tx); 1951 dsl_dataset_t *hds; 1952 struct promotenode *snap; 1953 dsl_dataset_t *origin_ds; 1954 int err; 1955 uint64_t unused; 1956 1957 err = promote_hold(ddpa, dp, FTAG); 1958 if (err != 0) 1959 return (err); 1960 1961 hds = ddpa->ddpa_clone; 1962 1963 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { 1964 promote_rele(ddpa, FTAG); 1965 return (SET_ERROR(EXDEV)); 1966 } 1967 1968 /* 1969 * Compute and check the amount of space to transfer. Since this is 1970 * so expensive, don't do the preliminary check. 1971 */ 1972 if (!dmu_tx_is_syncing(tx)) { 1973 promote_rele(ddpa, FTAG); 1974 return (0); 1975 } 1976 1977 snap = list_head(&ddpa->shared_snaps); 1978 origin_ds = snap->ds; 1979 1980 /* compute origin's new unique space */ 1981 snap = list_tail(&ddpa->clone_snaps); 1982 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 1983 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 1984 origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, 1985 &ddpa->unique, &unused, &unused); 1986 1987 /* 1988 * Walk the snapshots that we are moving 1989 * 1990 * Compute space to transfer. Consider the incremental changes 1991 * to used by each snapshot: 1992 * (my used) = (prev's used) + (blocks born) - (blocks killed) 1993 * So each snapshot gave birth to: 1994 * (blocks born) = (my used) - (prev's used) + (blocks killed) 1995 * So a sequence would look like: 1996 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 1997 * Which simplifies to: 1998 * uN + kN + kN-1 + ... + k1 + k0 1999 * Note however, if we stop before we reach the ORIGIN we get: 2000 * uN + kN + kN-1 + ... + kM - uM-1 2001 */ 2002 ddpa->used = origin_ds->ds_phys->ds_referenced_bytes; 2003 ddpa->comp = origin_ds->ds_phys->ds_compressed_bytes; 2004 ddpa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 2005 for (snap = list_head(&ddpa->shared_snaps); snap; 2006 snap = list_next(&ddpa->shared_snaps, snap)) { 2007 uint64_t val, dlused, dlcomp, dluncomp; 2008 dsl_dataset_t *ds = snap->ds; 2009 2010 /* 2011 * If there are long holds, we won't be able to evict 2012 * the objset. 2013 */ 2014 if (dsl_dataset_long_held(ds)) { 2015 err = SET_ERROR(EBUSY); 2016 goto out; 2017 } 2018 2019 /* Check that the snapshot name does not conflict */ 2020 VERIFY0(dsl_dataset_get_snapname(ds)); 2021 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2022 if (err == 0) { 2023 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2024 err = SET_ERROR(EEXIST); 2025 goto out; 2026 } 2027 if (err != ENOENT) 2028 goto out; 2029 2030 /* The very first snapshot does not have a deadlist */ 2031 if (ds->ds_phys->ds_prev_snap_obj == 0) 2032 continue; 2033 2034 dsl_deadlist_space(&ds->ds_deadlist, 2035 &dlused, &dlcomp, &dluncomp); 2036 ddpa->used += dlused; 2037 ddpa->comp += dlcomp; 2038 ddpa->uncomp += dluncomp; 2039 } 2040 2041 /* 2042 * If we are a clone of a clone then we never reached ORIGIN, 2043 * so we need to subtract out the clone origin's used space. 2044 */ 2045 if (ddpa->origin_origin) { 2046 ddpa->used -= ddpa->origin_origin->ds_phys->ds_referenced_bytes; 2047 ddpa->comp -= ddpa->origin_origin->ds_phys->ds_compressed_bytes; 2048 ddpa->uncomp -= 2049 ddpa->origin_origin->ds_phys->ds_uncompressed_bytes; 2050 } 2051 2052 /* Check that there is enough space here */ 2053 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2054 ddpa->used); 2055 if (err != 0) 2056 goto out; 2057 2058 /* 2059 * Compute the amounts of space that will be used by snapshots 2060 * after the promotion (for both origin and clone). For each, 2061 * it is the amount of space that will be on all of their 2062 * deadlists (that was not born before their new origin). 2063 */ 2064 if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2065 uint64_t space; 2066 2067 /* 2068 * Note, typically this will not be a clone of a clone, 2069 * so dd_origin_txg will be < TXG_INITIAL, so 2070 * these snaplist_space() -> dsl_deadlist_space_range() 2071 * calls will be fast because they do not have to 2072 * iterate over all bps. 2073 */ 2074 snap = list_head(&ddpa->origin_snaps); 2075 err = snaplist_space(&ddpa->shared_snaps, 2076 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2077 if (err != 0) 2078 goto out; 2079 2080 err = snaplist_space(&ddpa->clone_snaps, 2081 snap->ds->ds_dir->dd_origin_txg, &space); 2082 if (err != 0) 2083 goto out; 2084 ddpa->cloneusedsnap += space; 2085 } 2086 if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2087 err = snaplist_space(&ddpa->origin_snaps, 2088 origin_ds->ds_phys->ds_creation_txg, &ddpa->originusedsnap); 2089 if (err != 0) 2090 goto out; 2091 } 2092 2093out: 2094 promote_rele(ddpa, FTAG); 2095 return (err); 2096} 2097 2098static void 2099dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2100{ 2101 dsl_dataset_promote_arg_t *ddpa = arg; 2102 dsl_pool_t *dp = dmu_tx_pool(tx); 2103 dsl_dataset_t *hds; 2104 struct promotenode *snap; 2105 dsl_dataset_t *origin_ds; 2106 dsl_dataset_t *origin_head; 2107 dsl_dir_t *dd; 2108 dsl_dir_t *odd = NULL; 2109 uint64_t oldnext_obj; 2110 int64_t delta; 2111 2112 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2113 hds = ddpa->ddpa_clone; 2114 2115 ASSERT0(hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE); 2116 2117 snap = list_head(&ddpa->shared_snaps); 2118 origin_ds = snap->ds; 2119 dd = hds->ds_dir; 2120 2121 snap = list_head(&ddpa->origin_snaps); 2122 origin_head = snap->ds; 2123 2124 /* 2125 * We need to explicitly open odd, since origin_ds's dd will be 2126 * changing. 2127 */ 2128 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2129 NULL, FTAG, &odd)); 2130 2131 /* change origin's next snap */ 2132 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2133 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; 2134 snap = list_tail(&ddpa->clone_snaps); 2135 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2136 origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; 2137 2138 /* change the origin's next clone */ 2139 if (origin_ds->ds_phys->ds_next_clones_obj) { 2140 dsl_dataset_remove_from_next_clones(origin_ds, 2141 snap->ds->ds_object, tx); 2142 VERIFY0(zap_add_int(dp->dp_meta_objset, 2143 origin_ds->ds_phys->ds_next_clones_obj, 2144 oldnext_obj, tx)); 2145 } 2146 2147 /* change origin */ 2148 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2149 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 2150 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 2151 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2152 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2153 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 2154 origin_head->ds_dir->dd_origin_txg = 2155 origin_ds->ds_phys->ds_creation_txg; 2156 2157 /* change dd_clone entries */ 2158 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2159 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2160 odd->dd_phys->dd_clones, hds->ds_object, tx)); 2161 VERIFY0(zap_add_int(dp->dp_meta_objset, 2162 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2163 hds->ds_object, tx)); 2164 2165 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2166 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2167 origin_head->ds_object, tx)); 2168 if (dd->dd_phys->dd_clones == 0) { 2169 dd->dd_phys->dd_clones = zap_create(dp->dp_meta_objset, 2170 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 2171 } 2172 VERIFY0(zap_add_int(dp->dp_meta_objset, 2173 dd->dd_phys->dd_clones, origin_head->ds_object, tx)); 2174 } 2175 2176 /* move snapshots to this dir */ 2177 for (snap = list_head(&ddpa->shared_snaps); snap; 2178 snap = list_next(&ddpa->shared_snaps, snap)) { 2179 dsl_dataset_t *ds = snap->ds; 2180 2181 /* 2182 * Property callbacks are registered to a particular 2183 * dsl_dir. Since ours is changing, evict the objset 2184 * so that they will be unregistered from the old dsl_dir. 2185 */ 2186 if (ds->ds_objset) { 2187 dmu_objset_evict(ds->ds_objset); 2188 ds->ds_objset = NULL; 2189 } 2190 2191 /* move snap name entry */ 2192 VERIFY0(dsl_dataset_get_snapname(ds)); 2193 VERIFY0(dsl_dataset_snap_remove(origin_head, 2194 ds->ds_snapname, tx)); 2195 VERIFY0(zap_add(dp->dp_meta_objset, 2196 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2197 8, 1, &ds->ds_object, tx)); 2198 2199 /* change containing dsl_dir */ 2200 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2201 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2202 ds->ds_phys->ds_dir_obj = dd->dd_object; 2203 ASSERT3P(ds->ds_dir, ==, odd); 2204 dsl_dir_rele(ds->ds_dir, ds); 2205 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2206 NULL, ds, &ds->ds_dir)); 2207 2208 /* move any clone references */ 2209 if (ds->ds_phys->ds_next_clones_obj && 2210 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2211 zap_cursor_t zc; 2212 zap_attribute_t za; 2213 2214 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2215 ds->ds_phys->ds_next_clones_obj); 2216 zap_cursor_retrieve(&zc, &za) == 0; 2217 zap_cursor_advance(&zc)) { 2218 dsl_dataset_t *cnds; 2219 uint64_t o; 2220 2221 if (za.za_first_integer == oldnext_obj) { 2222 /* 2223 * We've already moved the 2224 * origin's reference. 2225 */ 2226 continue; 2227 } 2228 2229 VERIFY0(dsl_dataset_hold_obj(dp, 2230 za.za_first_integer, FTAG, &cnds)); 2231 o = cnds->ds_dir->dd_phys->dd_head_dataset_obj; 2232 2233 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2234 odd->dd_phys->dd_clones, o, tx)); 2235 VERIFY0(zap_add_int(dp->dp_meta_objset, 2236 dd->dd_phys->dd_clones, o, tx)); 2237 dsl_dataset_rele(cnds, FTAG); 2238 } 2239 zap_cursor_fini(&zc); 2240 } 2241 2242 ASSERT(!dsl_prop_hascb(ds)); 2243 } 2244 2245 /* 2246 * Change space accounting. 2247 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2248 * both be valid, or both be 0 (resulting in delta == 0). This 2249 * is true for each of {clone,origin} independently. 2250 */ 2251 2252 delta = ddpa->cloneusedsnap - 2253 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2254 ASSERT3S(delta, >=, 0); 2255 ASSERT3U(ddpa->used, >=, delta); 2256 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2257 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2258 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2259 2260 delta = ddpa->originusedsnap - 2261 odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2262 ASSERT3S(delta, <=, 0); 2263 ASSERT3U(ddpa->used, >=, -delta); 2264 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2265 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2266 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2267 2268 origin_ds->ds_phys->ds_unique_bytes = ddpa->unique; 2269 2270 /* log history record */ 2271 spa_history_log_internal_ds(hds, "promote", tx, ""); 2272 2273 dsl_dir_rele(odd, FTAG); 2274 promote_rele(ddpa, FTAG); 2275} 2276 2277/* 2278 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2279 * (exclusive) and last_obj (inclusive). The list will be in reverse 2280 * order (last_obj will be the list_head()). If first_obj == 0, do all 2281 * snapshots back to this dataset's origin. 2282 */ 2283static int 2284snaplist_make(dsl_pool_t *dp, 2285 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2286{ 2287 uint64_t obj = last_obj; 2288 2289 list_create(l, sizeof (struct promotenode), 2290 offsetof(struct promotenode, link)); 2291 2292 while (obj != first_obj) { 2293 dsl_dataset_t *ds; 2294 struct promotenode *snap; 2295 int err; 2296 2297 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2298 ASSERT(err != ENOENT); 2299 if (err != 0) 2300 return (err); 2301 2302 if (first_obj == 0) 2303 first_obj = ds->ds_dir->dd_phys->dd_origin_obj; 2304 2305 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2306 snap->ds = ds; 2307 list_insert_tail(l, snap); 2308 obj = ds->ds_phys->ds_prev_snap_obj; 2309 } 2310 2311 return (0); 2312} 2313 2314static int 2315snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2316{ 2317 struct promotenode *snap; 2318 2319 *spacep = 0; 2320 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2321 uint64_t used, comp, uncomp; 2322 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2323 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2324 *spacep += used; 2325 } 2326 return (0); 2327} 2328 2329static void 2330snaplist_destroy(list_t *l, void *tag) 2331{ 2332 struct promotenode *snap; 2333 2334 if (l == NULL || !list_link_active(&l->list_head)) 2335 return; 2336 2337 while ((snap = list_tail(l)) != NULL) { 2338 list_remove(l, snap); 2339 dsl_dataset_rele(snap->ds, tag); 2340 kmem_free(snap, sizeof (*snap)); 2341 } 2342 list_destroy(l); 2343} 2344 2345static int 2346promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2347{ 2348 int error; 2349 dsl_dir_t *dd; 2350 struct promotenode *snap; 2351 2352 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2353 &ddpa->ddpa_clone); 2354 if (error != 0) 2355 return (error); 2356 dd = ddpa->ddpa_clone->ds_dir; 2357 2358 if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) || 2359 !dsl_dir_is_clone(dd)) { 2360 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2361 return (SET_ERROR(EINVAL)); 2362 } 2363 2364 error = snaplist_make(dp, 0, dd->dd_phys->dd_origin_obj, 2365 &ddpa->shared_snaps, tag); 2366 if (error != 0) 2367 goto out; 2368 2369 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2370 &ddpa->clone_snaps, tag); 2371 if (error != 0) 2372 goto out; 2373 2374 snap = list_head(&ddpa->shared_snaps); 2375 ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); 2376 error = snaplist_make(dp, dd->dd_phys->dd_origin_obj, 2377 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, 2378 &ddpa->origin_snaps, tag); 2379 if (error != 0) 2380 goto out; 2381 2382 if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) { 2383 error = dsl_dataset_hold_obj(dp, 2384 snap->ds->ds_dir->dd_phys->dd_origin_obj, 2385 tag, &ddpa->origin_origin); 2386 if (error != 0) 2387 goto out; 2388 } 2389out: 2390 if (error != 0) 2391 promote_rele(ddpa, tag); 2392 return (error); 2393} 2394 2395static void 2396promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2397{ 2398 snaplist_destroy(&ddpa->shared_snaps, tag); 2399 snaplist_destroy(&ddpa->clone_snaps, tag); 2400 snaplist_destroy(&ddpa->origin_snaps, tag); 2401 if (ddpa->origin_origin != NULL) 2402 dsl_dataset_rele(ddpa->origin_origin, tag); 2403 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2404} 2405 2406/* 2407 * Promote a clone. 2408 * 2409 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2410 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2411 */ 2412int 2413dsl_dataset_promote(const char *name, char *conflsnap) 2414{ 2415 dsl_dataset_promote_arg_t ddpa = { 0 }; 2416 uint64_t numsnaps; 2417 int error; 2418 objset_t *os; 2419 2420 /* 2421 * We will modify space proportional to the number of 2422 * snapshots. Compute numsnaps. 2423 */ 2424 error = dmu_objset_hold(name, FTAG, &os); 2425 if (error != 0) 2426 return (error); 2427 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2428 dmu_objset_ds(os)->ds_phys->ds_snapnames_zapobj, &numsnaps); 2429 dmu_objset_rele(os, FTAG); 2430 if (error != 0) 2431 return (error); 2432 2433 ddpa.ddpa_clonename = name; 2434 ddpa.err_ds = conflsnap; 2435 2436 return (dsl_sync_task(name, dsl_dataset_promote_check, 2437 dsl_dataset_promote_sync, &ddpa, 2 + numsnaps)); 2438} 2439 2440int 2441dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2442 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2443{ 2444 int64_t unused_refres_delta; 2445 2446 /* they should both be heads */ 2447 if (dsl_dataset_is_snapshot(clone) || 2448 dsl_dataset_is_snapshot(origin_head)) 2449 return (SET_ERROR(EINVAL)); 2450 2451 /* if we are not forcing, the branch point should be just before them */ 2452 if (!force && clone->ds_prev != origin_head->ds_prev) 2453 return (SET_ERROR(EINVAL)); 2454 2455 /* clone should be the clone (unless they are unrelated) */ 2456 if (clone->ds_prev != NULL && 2457 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2458 origin_head->ds_dir != clone->ds_prev->ds_dir) 2459 return (SET_ERROR(EINVAL)); 2460 2461 /* the clone should be a child of the origin */ 2462 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2463 return (SET_ERROR(EINVAL)); 2464 2465 /* origin_head shouldn't be modified unless 'force' */ 2466 if (!force && 2467 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2468 return (SET_ERROR(ETXTBSY)); 2469 2470 /* origin_head should have no long holds (e.g. is not mounted) */ 2471 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2472 return (SET_ERROR(EBUSY)); 2473 2474 /* check amount of any unconsumed refreservation */ 2475 unused_refres_delta = 2476 (int64_t)MIN(origin_head->ds_reserved, 2477 origin_head->ds_phys->ds_unique_bytes) - 2478 (int64_t)MIN(origin_head->ds_reserved, 2479 clone->ds_phys->ds_unique_bytes); 2480 2481 if (unused_refres_delta > 0 && 2482 unused_refres_delta > 2483 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2484 return (SET_ERROR(ENOSPC)); 2485 2486 /* clone can't be over the head's refquota */ 2487 if (origin_head->ds_quota != 0 && 2488 clone->ds_phys->ds_referenced_bytes > origin_head->ds_quota) 2489 return (SET_ERROR(EDQUOT)); 2490 2491 return (0); 2492} 2493 2494void 2495dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2496 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2497{ 2498 dsl_pool_t *dp = dmu_tx_pool(tx); 2499 int64_t unused_refres_delta; 2500 2501 ASSERT(clone->ds_reserved == 0); 2502 ASSERT(origin_head->ds_quota == 0 || 2503 clone->ds_phys->ds_unique_bytes <= origin_head->ds_quota); 2504 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2505 2506 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2507 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2508 2509 if (clone->ds_objset != NULL) { 2510 dmu_objset_evict(clone->ds_objset); 2511 clone->ds_objset = NULL; 2512 } 2513 2514 if (origin_head->ds_objset != NULL) { 2515 dmu_objset_evict(origin_head->ds_objset); 2516 origin_head->ds_objset = NULL; 2517 } 2518 2519 unused_refres_delta = 2520 (int64_t)MIN(origin_head->ds_reserved, 2521 origin_head->ds_phys->ds_unique_bytes) - 2522 (int64_t)MIN(origin_head->ds_reserved, 2523 clone->ds_phys->ds_unique_bytes); 2524 2525 /* 2526 * Reset origin's unique bytes, if it exists. 2527 */ 2528 if (clone->ds_prev) { 2529 dsl_dataset_t *origin = clone->ds_prev; 2530 uint64_t comp, uncomp; 2531 2532 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2533 dsl_deadlist_space_range(&clone->ds_deadlist, 2534 origin->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2535 &origin->ds_phys->ds_unique_bytes, &comp, &uncomp); 2536 } 2537 2538 /* swap blkptrs */ 2539 { 2540 blkptr_t tmp; 2541 tmp = origin_head->ds_phys->ds_bp; 2542 origin_head->ds_phys->ds_bp = clone->ds_phys->ds_bp; 2543 clone->ds_phys->ds_bp = tmp; 2544 } 2545 2546 /* set dd_*_bytes */ 2547 { 2548 int64_t dused, dcomp, duncomp; 2549 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2550 uint64_t odl_used, odl_comp, odl_uncomp; 2551 2552 ASSERT3U(clone->ds_dir->dd_phys-> 2553 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2554 2555 dsl_deadlist_space(&clone->ds_deadlist, 2556 &cdl_used, &cdl_comp, &cdl_uncomp); 2557 dsl_deadlist_space(&origin_head->ds_deadlist, 2558 &odl_used, &odl_comp, &odl_uncomp); 2559 2560 dused = clone->ds_phys->ds_referenced_bytes + cdl_used - 2561 (origin_head->ds_phys->ds_referenced_bytes + odl_used); 2562 dcomp = clone->ds_phys->ds_compressed_bytes + cdl_comp - 2563 (origin_head->ds_phys->ds_compressed_bytes + odl_comp); 2564 duncomp = clone->ds_phys->ds_uncompressed_bytes + 2565 cdl_uncomp - 2566 (origin_head->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2567 2568 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2569 dused, dcomp, duncomp, tx); 2570 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2571 -dused, -dcomp, -duncomp, tx); 2572 2573 /* 2574 * The difference in the space used by snapshots is the 2575 * difference in snapshot space due to the head's 2576 * deadlist (since that's the only thing that's 2577 * changing that affects the snapused). 2578 */ 2579 dsl_deadlist_space_range(&clone->ds_deadlist, 2580 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2581 &cdl_used, &cdl_comp, &cdl_uncomp); 2582 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2583 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2584 &odl_used, &odl_comp, &odl_uncomp); 2585 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2586 DD_USED_HEAD, DD_USED_SNAP, tx); 2587 } 2588 2589 /* swap ds_*_bytes */ 2590 SWITCH64(origin_head->ds_phys->ds_referenced_bytes, 2591 clone->ds_phys->ds_referenced_bytes); 2592 SWITCH64(origin_head->ds_phys->ds_compressed_bytes, 2593 clone->ds_phys->ds_compressed_bytes); 2594 SWITCH64(origin_head->ds_phys->ds_uncompressed_bytes, 2595 clone->ds_phys->ds_uncompressed_bytes); 2596 SWITCH64(origin_head->ds_phys->ds_unique_bytes, 2597 clone->ds_phys->ds_unique_bytes); 2598 2599 /* apply any parent delta for change in unconsumed refreservation */ 2600 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 2601 unused_refres_delta, 0, 0, tx); 2602 2603 /* 2604 * Swap deadlists. 2605 */ 2606 dsl_deadlist_close(&clone->ds_deadlist); 2607 dsl_deadlist_close(&origin_head->ds_deadlist); 2608 SWITCH64(origin_head->ds_phys->ds_deadlist_obj, 2609 clone->ds_phys->ds_deadlist_obj); 2610 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 2611 clone->ds_phys->ds_deadlist_obj); 2612 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 2613 origin_head->ds_phys->ds_deadlist_obj); 2614 2615 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 2616 2617 spa_history_log_internal_ds(clone, "clone swap", tx, 2618 "parent=%s", origin_head->ds_dir->dd_myname); 2619} 2620 2621/* 2622 * Given a pool name and a dataset object number in that pool, 2623 * return the name of that dataset. 2624 */ 2625int 2626dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2627{ 2628 dsl_pool_t *dp; 2629 dsl_dataset_t *ds; 2630 int error; 2631 2632 error = dsl_pool_hold(pname, FTAG, &dp); 2633 if (error != 0) 2634 return (error); 2635 2636 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 2637 if (error == 0) { 2638 dsl_dataset_name(ds, buf); 2639 dsl_dataset_rele(ds, FTAG); 2640 } 2641 dsl_pool_rele(dp, FTAG); 2642 2643 return (error); 2644} 2645 2646int 2647dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2648 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2649{ 2650 int error = 0; 2651 2652 ASSERT3S(asize, >, 0); 2653 2654 /* 2655 * *ref_rsrv is the portion of asize that will come from any 2656 * unconsumed refreservation space. 2657 */ 2658 *ref_rsrv = 0; 2659 2660 mutex_enter(&ds->ds_lock); 2661 /* 2662 * Make a space adjustment for reserved bytes. 2663 */ 2664 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2665 ASSERT3U(*used, >=, 2666 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2667 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2668 *ref_rsrv = 2669 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2670 } 2671 2672 if (!check_quota || ds->ds_quota == 0) { 2673 mutex_exit(&ds->ds_lock); 2674 return (0); 2675 } 2676 /* 2677 * If they are requesting more space, and our current estimate 2678 * is over quota, they get to try again unless the actual 2679 * on-disk is over quota and there are no pending changes (which 2680 * may free up space for us). 2681 */ 2682 if (ds->ds_phys->ds_referenced_bytes + inflight >= ds->ds_quota) { 2683 if (inflight > 0 || 2684 ds->ds_phys->ds_referenced_bytes < ds->ds_quota) 2685 error = SET_ERROR(ERESTART); 2686 else 2687 error = SET_ERROR(EDQUOT); 2688 } 2689 mutex_exit(&ds->ds_lock); 2690 2691 return (error); 2692} 2693 2694typedef struct dsl_dataset_set_qr_arg { 2695 const char *ddsqra_name; 2696 zprop_source_t ddsqra_source; 2697 uint64_t ddsqra_value; 2698} dsl_dataset_set_qr_arg_t; 2699 2700 2701/* ARGSUSED */ 2702static int 2703dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 2704{ 2705 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2706 dsl_pool_t *dp = dmu_tx_pool(tx); 2707 dsl_dataset_t *ds; 2708 int error; 2709 uint64_t newval; 2710 2711 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 2712 return (SET_ERROR(ENOTSUP)); 2713 2714 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2715 if (error != 0) 2716 return (error); 2717 2718 if (dsl_dataset_is_snapshot(ds)) { 2719 dsl_dataset_rele(ds, FTAG); 2720 return (SET_ERROR(EINVAL)); 2721 } 2722 2723 error = dsl_prop_predict(ds->ds_dir, 2724 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2725 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2726 if (error != 0) { 2727 dsl_dataset_rele(ds, FTAG); 2728 return (error); 2729 } 2730 2731 if (newval == 0) { 2732 dsl_dataset_rele(ds, FTAG); 2733 return (0); 2734 } 2735 2736 if (newval < ds->ds_phys->ds_referenced_bytes || 2737 newval < ds->ds_reserved) { 2738 dsl_dataset_rele(ds, FTAG); 2739 return (SET_ERROR(ENOSPC)); 2740 } 2741 2742 dsl_dataset_rele(ds, FTAG); 2743 return (0); 2744} 2745 2746static void 2747dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 2748{ 2749 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2750 dsl_pool_t *dp = dmu_tx_pool(tx); 2751 dsl_dataset_t *ds; 2752 uint64_t newval; 2753 2754 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2755 2756 dsl_prop_set_sync_impl(ds, 2757 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2758 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 2759 &ddsqra->ddsqra_value, tx); 2760 2761 VERIFY0(dsl_prop_get_int_ds(ds, 2762 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 2763 2764 if (ds->ds_quota != newval) { 2765 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2766 ds->ds_quota = newval; 2767 } 2768 dsl_dataset_rele(ds, FTAG); 2769} 2770 2771int 2772dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 2773 uint64_t refquota) 2774{ 2775 dsl_dataset_set_qr_arg_t ddsqra; 2776 2777 ddsqra.ddsqra_name = dsname; 2778 ddsqra.ddsqra_source = source; 2779 ddsqra.ddsqra_value = refquota; 2780 2781 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 2782 dsl_dataset_set_refquota_sync, &ddsqra, 0)); 2783} 2784 2785static int 2786dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 2787{ 2788 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2789 dsl_pool_t *dp = dmu_tx_pool(tx); 2790 dsl_dataset_t *ds; 2791 int error; 2792 uint64_t newval, unique; 2793 2794 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 2795 return (SET_ERROR(ENOTSUP)); 2796 2797 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2798 if (error != 0) 2799 return (error); 2800 2801 if (dsl_dataset_is_snapshot(ds)) { 2802 dsl_dataset_rele(ds, FTAG); 2803 return (SET_ERROR(EINVAL)); 2804 } 2805 2806 error = dsl_prop_predict(ds->ds_dir, 2807 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2808 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2809 if (error != 0) { 2810 dsl_dataset_rele(ds, FTAG); 2811 return (error); 2812 } 2813 2814 /* 2815 * If we are doing the preliminary check in open context, the 2816 * space estimates may be inaccurate. 2817 */ 2818 if (!dmu_tx_is_syncing(tx)) { 2819 dsl_dataset_rele(ds, FTAG); 2820 return (0); 2821 } 2822 2823 mutex_enter(&ds->ds_lock); 2824 if (!DS_UNIQUE_IS_ACCURATE(ds)) 2825 dsl_dataset_recalc_head_uniq(ds); 2826 unique = ds->ds_phys->ds_unique_bytes; 2827 mutex_exit(&ds->ds_lock); 2828 2829 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 2830 uint64_t delta = MAX(unique, newval) - 2831 MAX(unique, ds->ds_reserved); 2832 2833 if (delta > 2834 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 2835 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 2836 dsl_dataset_rele(ds, FTAG); 2837 return (SET_ERROR(ENOSPC)); 2838 } 2839 } 2840 2841 dsl_dataset_rele(ds, FTAG); 2842 return (0); 2843} 2844 2845void 2846dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 2847 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 2848{ 2849 uint64_t newval; 2850 uint64_t unique; 2851 int64_t delta; 2852 2853 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2854 source, sizeof (value), 1, &value, tx); 2855 2856 VERIFY0(dsl_prop_get_int_ds(ds, 2857 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 2858 2859 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2860 mutex_enter(&ds->ds_dir->dd_lock); 2861 mutex_enter(&ds->ds_lock); 2862 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 2863 unique = ds->ds_phys->ds_unique_bytes; 2864 delta = MAX(0, (int64_t)(newval - unique)) - 2865 MAX(0, (int64_t)(ds->ds_reserved - unique)); 2866 ds->ds_reserved = newval; 2867 mutex_exit(&ds->ds_lock); 2868 2869 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 2870 mutex_exit(&ds->ds_dir->dd_lock); 2871} 2872 2873static void 2874dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 2875{ 2876 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2877 dsl_pool_t *dp = dmu_tx_pool(tx); 2878 dsl_dataset_t *ds; 2879 2880 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2881 dsl_dataset_set_refreservation_sync_impl(ds, 2882 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 2883 dsl_dataset_rele(ds, FTAG); 2884} 2885 2886int 2887dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 2888 uint64_t refreservation) 2889{ 2890 dsl_dataset_set_qr_arg_t ddsqra; 2891 2892 ddsqra.ddsqra_name = dsname; 2893 ddsqra.ddsqra_source = source; 2894 ddsqra.ddsqra_value = refreservation; 2895 2896 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 2897 dsl_dataset_set_refreservation_sync, &ddsqra, 0)); 2898} 2899 2900/* 2901 * Return (in *usedp) the amount of space written in new that is not 2902 * present in oldsnap. New may be a snapshot or the head. Old must be 2903 * a snapshot before new, in new's filesystem (or its origin). If not then 2904 * fail and return EINVAL. 2905 * 2906 * The written space is calculated by considering two components: First, we 2907 * ignore any freed space, and calculate the written as new's used space 2908 * minus old's used space. Next, we add in the amount of space that was freed 2909 * between the two snapshots, thus reducing new's used space relative to old's. 2910 * Specifically, this is the space that was born before old->ds_creation_txg, 2911 * and freed before new (ie. on new's deadlist or a previous deadlist). 2912 * 2913 * space freed [---------------------] 2914 * snapshots ---O-------O--------O-------O------ 2915 * oldsnap new 2916 */ 2917int 2918dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 2919 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 2920{ 2921 int err = 0; 2922 uint64_t snapobj; 2923 dsl_pool_t *dp = new->ds_dir->dd_pool; 2924 2925 ASSERT(dsl_pool_config_held(dp)); 2926 2927 *usedp = 0; 2928 *usedp += new->ds_phys->ds_referenced_bytes; 2929 *usedp -= oldsnap->ds_phys->ds_referenced_bytes; 2930 2931 *compp = 0; 2932 *compp += new->ds_phys->ds_compressed_bytes; 2933 *compp -= oldsnap->ds_phys->ds_compressed_bytes; 2934 2935 *uncompp = 0; 2936 *uncompp += new->ds_phys->ds_uncompressed_bytes; 2937 *uncompp -= oldsnap->ds_phys->ds_uncompressed_bytes; 2938 2939 snapobj = new->ds_object; 2940 while (snapobj != oldsnap->ds_object) { 2941 dsl_dataset_t *snap; 2942 uint64_t used, comp, uncomp; 2943 2944 if (snapobj == new->ds_object) { 2945 snap = new; 2946 } else { 2947 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 2948 if (err != 0) 2949 break; 2950 } 2951 2952 if (snap->ds_phys->ds_prev_snap_txg == 2953 oldsnap->ds_phys->ds_creation_txg) { 2954 /* 2955 * The blocks in the deadlist can not be born after 2956 * ds_prev_snap_txg, so get the whole deadlist space, 2957 * which is more efficient (especially for old-format 2958 * deadlists). Unfortunately the deadlist code 2959 * doesn't have enough information to make this 2960 * optimization itself. 2961 */ 2962 dsl_deadlist_space(&snap->ds_deadlist, 2963 &used, &comp, &uncomp); 2964 } else { 2965 dsl_deadlist_space_range(&snap->ds_deadlist, 2966 0, oldsnap->ds_phys->ds_creation_txg, 2967 &used, &comp, &uncomp); 2968 } 2969 *usedp += used; 2970 *compp += comp; 2971 *uncompp += uncomp; 2972 2973 /* 2974 * If we get to the beginning of the chain of snapshots 2975 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 2976 * was not a snapshot of/before new. 2977 */ 2978 snapobj = snap->ds_phys->ds_prev_snap_obj; 2979 if (snap != new) 2980 dsl_dataset_rele(snap, FTAG); 2981 if (snapobj == 0) { 2982 err = SET_ERROR(EINVAL); 2983 break; 2984 } 2985 2986 } 2987 return (err); 2988} 2989 2990/* 2991 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 2992 * lastsnap, and all snapshots in between are deleted. 2993 * 2994 * blocks that would be freed [---------------------------] 2995 * snapshots ---O-------O--------O-------O--------O 2996 * firstsnap lastsnap 2997 * 2998 * This is the set of blocks that were born after the snap before firstsnap, 2999 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3000 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3001 * We calculate this by iterating over the relevant deadlists (from the snap 3002 * after lastsnap, backward to the snap after firstsnap), summing up the 3003 * space on the deadlist that was born after the snap before firstsnap. 3004 */ 3005int 3006dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3007 dsl_dataset_t *lastsnap, 3008 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3009{ 3010 int err = 0; 3011 uint64_t snapobj; 3012 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3013 3014 ASSERT(dsl_dataset_is_snapshot(firstsnap)); 3015 ASSERT(dsl_dataset_is_snapshot(lastsnap)); 3016 3017 /* 3018 * Check that the snapshots are in the same dsl_dir, and firstsnap 3019 * is before lastsnap. 3020 */ 3021 if (firstsnap->ds_dir != lastsnap->ds_dir || 3022 firstsnap->ds_phys->ds_creation_txg > 3023 lastsnap->ds_phys->ds_creation_txg) 3024 return (SET_ERROR(EINVAL)); 3025 3026 *usedp = *compp = *uncompp = 0; 3027 3028 snapobj = lastsnap->ds_phys->ds_next_snap_obj; 3029 while (snapobj != firstsnap->ds_object) { 3030 dsl_dataset_t *ds; 3031 uint64_t used, comp, uncomp; 3032 3033 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3034 if (err != 0) 3035 break; 3036 3037 dsl_deadlist_space_range(&ds->ds_deadlist, 3038 firstsnap->ds_phys->ds_prev_snap_txg, UINT64_MAX, 3039 &used, &comp, &uncomp); 3040 *usedp += used; 3041 *compp += comp; 3042 *uncompp += uncomp; 3043 3044 snapobj = ds->ds_phys->ds_prev_snap_obj; 3045 ASSERT3U(snapobj, !=, 0); 3046 dsl_dataset_rele(ds, FTAG); 3047 } 3048 return (err); 3049} 3050 3051/* 3052 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3053 * For example, they could both be snapshots of the same filesystem, and 3054 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3055 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3056 * filesystem. Or 'earlier' could be the origin's origin. 3057 * 3058 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3059 */ 3060boolean_t 3061dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3062 uint64_t earlier_txg) 3063{ 3064 dsl_pool_t *dp = later->ds_dir->dd_pool; 3065 int error; 3066 boolean_t ret; 3067 3068 ASSERT(dsl_pool_config_held(dp)); 3069 ASSERT(dsl_dataset_is_snapshot(earlier) || earlier_txg != 0); 3070 3071 if (earlier_txg == 0) 3072 earlier_txg = earlier->ds_phys->ds_creation_txg; 3073 3074 if (dsl_dataset_is_snapshot(later) && 3075 earlier_txg >= later->ds_phys->ds_creation_txg) 3076 return (B_FALSE); 3077 3078 if (later->ds_dir == earlier->ds_dir) 3079 return (B_TRUE); 3080 if (!dsl_dir_is_clone(later->ds_dir)) 3081 return (B_FALSE); 3082 3083 if (later->ds_dir->dd_phys->dd_origin_obj == earlier->ds_object) 3084 return (B_TRUE); 3085 dsl_dataset_t *origin; 3086 error = dsl_dataset_hold_obj(dp, 3087 later->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin); 3088 if (error != 0) 3089 return (B_FALSE); 3090 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3091 dsl_dataset_rele(origin, FTAG); 3092 return (ret); 3093} 3094 3095 3096void 3097dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3098{ 3099 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3100 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3101} 3102