dsl_dataset.c revision 297113
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org> 24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 25 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2014 RackTop Systems. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright (c) 2014 Integros [integros.com] 29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. 30 */ 31 32#include <sys/dmu_objset.h> 33#include <sys/dsl_dataset.h> 34#include <sys/dsl_dir.h> 35#include <sys/dsl_prop.h> 36#include <sys/dsl_synctask.h> 37#include <sys/dmu_traverse.h> 38#include <sys/dmu_impl.h> 39#include <sys/dmu_send.h> 40#include <sys/dmu_tx.h> 41#include <sys/arc.h> 42#include <sys/zio.h> 43#include <sys/zap.h> 44#include <sys/zfeature.h> 45#include <sys/unique.h> 46#include <sys/zfs_context.h> 47#include <sys/zfs_ioctl.h> 48#include <sys/spa.h> 49#include <sys/zfs_znode.h> 50#include <sys/zfs_onexit.h> 51#include <sys/zvol.h> 52#include <sys/dsl_scan.h> 53#include <sys/dsl_deadlist.h> 54#include <sys/dsl_destroy.h> 55#include <sys/dsl_userhold.h> 56#include <sys/dsl_bookmark.h> 57#include <sys/dmu_send.h> 58#include <sys/zio_checksum.h> 59#include <sys/zio_compress.h> 60#include <zfs_fletcher.h> 61 62SYSCTL_DECL(_vfs_zfs); 63 64/* 65 * The SPA supports block sizes up to 16MB. However, very large blocks 66 * can have an impact on i/o latency (e.g. tying up a spinning disk for 67 * ~300ms), and also potentially on the memory allocator. Therefore, 68 * we do not allow the recordsize to be set larger than zfs_max_recordsize 69 * (default 1MB). Larger blocks can be created by changing this tunable, 70 * and pools with larger blocks can always be imported and used, regardless 71 * of this setting. 72 */ 73int zfs_max_recordsize = 1 * 1024 * 1024; 74SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 75 &zfs_max_recordsize, 0, 76 "Maximum block size. Expect dragons when tuning this."); 77 78#define SWITCH64(x, y) \ 79 { \ 80 uint64_t __tmp = (x); \ 81 (x) = (y); \ 82 (y) = __tmp; \ 83 } 84 85#define DS_REF_MAX (1ULL << 62) 86 87extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 88 89extern int spa_asize_inflation; 90 91/* 92 * Figure out how much of this delta should be propogated to the dsl_dir 93 * layer. If there's a refreservation, that space has already been 94 * partially accounted for in our ancestors. 95 */ 96static int64_t 97parent_delta(dsl_dataset_t *ds, int64_t delta) 98{ 99 dsl_dataset_phys_t *ds_phys; 100 uint64_t old_bytes, new_bytes; 101 102 if (ds->ds_reserved == 0) 103 return (delta); 104 105 ds_phys = dsl_dataset_phys(ds); 106 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 107 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 108 109 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 110 return (new_bytes - old_bytes); 111} 112 113void 114dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 115{ 116 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 117 int compressed = BP_GET_PSIZE(bp); 118 int uncompressed = BP_GET_UCSIZE(bp); 119 int64_t delta; 120 121 dprintf_bp(bp, "ds=%p", ds); 122 123 ASSERT(dmu_tx_is_syncing(tx)); 124 /* It could have been compressed away to nothing */ 125 if (BP_IS_HOLE(bp)) 126 return; 127 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 128 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 129 if (ds == NULL) { 130 dsl_pool_mos_diduse_space(tx->tx_pool, 131 used, compressed, uncompressed); 132 return; 133 } 134 135 dmu_buf_will_dirty(ds->ds_dbuf, tx); 136 mutex_enter(&ds->ds_lock); 137 delta = parent_delta(ds, used); 138 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 139 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 140 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 141 dsl_dataset_phys(ds)->ds_unique_bytes += used; 142 143 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 144 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 145 B_TRUE; 146 } 147 148 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 149 if (f != SPA_FEATURE_NONE) 150 ds->ds_feature_activation_needed[f] = B_TRUE; 151 152 mutex_exit(&ds->ds_lock); 153 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 154 compressed, uncompressed, tx); 155 dsl_dir_transfer_space(ds->ds_dir, used - delta, 156 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 157} 158 159int 160dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 161 boolean_t async) 162{ 163 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 164 int compressed = BP_GET_PSIZE(bp); 165 int uncompressed = BP_GET_UCSIZE(bp); 166 167 if (BP_IS_HOLE(bp)) 168 return (0); 169 170 ASSERT(dmu_tx_is_syncing(tx)); 171 ASSERT(bp->blk_birth <= tx->tx_txg); 172 173 if (ds == NULL) { 174 dsl_free(tx->tx_pool, tx->tx_txg, bp); 175 dsl_pool_mos_diduse_space(tx->tx_pool, 176 -used, -compressed, -uncompressed); 177 return (used); 178 } 179 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 180 181 ASSERT(!ds->ds_is_snapshot); 182 dmu_buf_will_dirty(ds->ds_dbuf, tx); 183 184 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 185 int64_t delta; 186 187 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 188 dsl_free(tx->tx_pool, tx->tx_txg, bp); 189 190 mutex_enter(&ds->ds_lock); 191 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 192 !DS_UNIQUE_IS_ACCURATE(ds)); 193 delta = parent_delta(ds, -used); 194 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 195 mutex_exit(&ds->ds_lock); 196 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 197 delta, -compressed, -uncompressed, tx); 198 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 199 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 200 } else { 201 dprintf_bp(bp, "putting on dead list: %s", ""); 202 if (async) { 203 /* 204 * We are here as part of zio's write done callback, 205 * which means we're a zio interrupt thread. We can't 206 * call dsl_deadlist_insert() now because it may block 207 * waiting for I/O. Instead, put bp on the deferred 208 * queue and let dsl_pool_sync() finish the job. 209 */ 210 bplist_append(&ds->ds_pending_deadlist, bp); 211 } else { 212 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 213 } 214 ASSERT3U(ds->ds_prev->ds_object, ==, 215 dsl_dataset_phys(ds)->ds_prev_snap_obj); 216 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 217 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 218 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 219 ds->ds_object && bp->blk_birth > 220 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 221 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 222 mutex_enter(&ds->ds_prev->ds_lock); 223 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 224 mutex_exit(&ds->ds_prev->ds_lock); 225 } 226 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 227 dsl_dir_transfer_space(ds->ds_dir, used, 228 DD_USED_HEAD, DD_USED_SNAP, tx); 229 } 230 } 231 mutex_enter(&ds->ds_lock); 232 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 233 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 234 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 235 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 236 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 237 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 238 mutex_exit(&ds->ds_lock); 239 240 return (used); 241} 242 243uint64_t 244dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 245{ 246 uint64_t trysnap = 0; 247 248 if (ds == NULL) 249 return (0); 250 /* 251 * The snapshot creation could fail, but that would cause an 252 * incorrect FALSE return, which would only result in an 253 * overestimation of the amount of space that an operation would 254 * consume, which is OK. 255 * 256 * There's also a small window where we could miss a pending 257 * snapshot, because we could set the sync task in the quiescing 258 * phase. So this should only be used as a guess. 259 */ 260 if (ds->ds_trysnap_txg > 261 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 262 trysnap = ds->ds_trysnap_txg; 263 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 264} 265 266boolean_t 267dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 268 uint64_t blk_birth) 269{ 270 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 271 (bp != NULL && BP_IS_HOLE(bp))) 272 return (B_FALSE); 273 274 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 275 276 return (B_TRUE); 277} 278 279static void 280dsl_dataset_evict(void *dbu) 281{ 282 dsl_dataset_t *ds = dbu; 283 284 ASSERT(ds->ds_owner == NULL); 285 286 ds->ds_dbuf = NULL; 287 288 unique_remove(ds->ds_fsid_guid); 289 290 if (ds->ds_objset != NULL) 291 dmu_objset_evict(ds->ds_objset); 292 293 if (ds->ds_prev) { 294 dsl_dataset_rele(ds->ds_prev, ds); 295 ds->ds_prev = NULL; 296 } 297 298 bplist_destroy(&ds->ds_pending_deadlist); 299 if (ds->ds_deadlist.dl_os != NULL) 300 dsl_deadlist_close(&ds->ds_deadlist); 301 if (ds->ds_dir) 302 dsl_dir_async_rele(ds->ds_dir, ds); 303 304 ASSERT(!list_link_active(&ds->ds_synced_link)); 305 306 list_destroy(&ds->ds_prop_cbs); 307 if (mutex_owned(&ds->ds_lock)) 308 mutex_exit(&ds->ds_lock); 309 mutex_destroy(&ds->ds_lock); 310 if (mutex_owned(&ds->ds_opening_lock)) 311 mutex_exit(&ds->ds_opening_lock); 312 mutex_destroy(&ds->ds_opening_lock); 313 mutex_destroy(&ds->ds_sendstream_lock); 314 refcount_destroy(&ds->ds_longholds); 315 316 kmem_free(ds, sizeof (dsl_dataset_t)); 317} 318 319int 320dsl_dataset_get_snapname(dsl_dataset_t *ds) 321{ 322 dsl_dataset_phys_t *headphys; 323 int err; 324 dmu_buf_t *headdbuf; 325 dsl_pool_t *dp = ds->ds_dir->dd_pool; 326 objset_t *mos = dp->dp_meta_objset; 327 328 if (ds->ds_snapname[0]) 329 return (0); 330 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 331 return (0); 332 333 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 334 FTAG, &headdbuf); 335 if (err != 0) 336 return (err); 337 headphys = headdbuf->db_data; 338 err = zap_value_search(dp->dp_meta_objset, 339 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 340 dmu_buf_rele(headdbuf, FTAG); 341 return (err); 342} 343 344int 345dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 346{ 347 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 348 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 349 matchtype_t mt; 350 int err; 351 352 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 353 mt = MT_FIRST; 354 else 355 mt = MT_EXACT; 356 357 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 358 value, mt, NULL, 0, NULL); 359 if (err == ENOTSUP && mt == MT_FIRST) 360 err = zap_lookup(mos, snapobj, name, 8, 1, value); 361 return (err); 362} 363 364int 365dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 366 boolean_t adj_cnt) 367{ 368 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 369 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 370 matchtype_t mt; 371 int err; 372 373 dsl_dir_snap_cmtime_update(ds->ds_dir); 374 375 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 376 mt = MT_FIRST; 377 else 378 mt = MT_EXACT; 379 380 err = zap_remove_norm(mos, snapobj, name, mt, tx); 381 if (err == ENOTSUP && mt == MT_FIRST) 382 err = zap_remove(mos, snapobj, name, tx); 383 384 if (err == 0 && adj_cnt) 385 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 386 DD_FIELD_SNAPSHOT_COUNT, tx); 387 388 return (err); 389} 390 391boolean_t 392dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 393{ 394 dmu_buf_t *dbuf = ds->ds_dbuf; 395 boolean_t result = B_FALSE; 396 397 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 398 ds->ds_object, DMU_BONUS_BLKID, tag)) { 399 400 if (ds == dmu_buf_get_user(dbuf)) 401 result = B_TRUE; 402 else 403 dmu_buf_rele(dbuf, tag); 404 } 405 406 return (result); 407} 408 409int 410dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 411 dsl_dataset_t **dsp) 412{ 413 objset_t *mos = dp->dp_meta_objset; 414 dmu_buf_t *dbuf; 415 dsl_dataset_t *ds; 416 int err; 417 dmu_object_info_t doi; 418 419 ASSERT(dsl_pool_config_held(dp)); 420 421 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 422 if (err != 0) 423 return (err); 424 425 /* Make sure dsobj has the correct object type. */ 426 dmu_object_info_from_db(dbuf, &doi); 427 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 428 dmu_buf_rele(dbuf, tag); 429 return (SET_ERROR(EINVAL)); 430 } 431 432 ds = dmu_buf_get_user(dbuf); 433 if (ds == NULL) { 434 dsl_dataset_t *winner = NULL; 435 436 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 437 ds->ds_dbuf = dbuf; 438 ds->ds_object = dsobj; 439 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 440 441 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 442 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 443 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 444 refcount_create(&ds->ds_longholds); 445 446 bplist_create(&ds->ds_pending_deadlist); 447 dsl_deadlist_open(&ds->ds_deadlist, 448 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 449 450 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 451 offsetof(dmu_sendarg_t, dsa_link)); 452 453 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 454 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 455 456 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 457 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 458 if (!(spa_feature_table[f].fi_flags & 459 ZFEATURE_FLAG_PER_DATASET)) 460 continue; 461 err = zap_contains(mos, dsobj, 462 spa_feature_table[f].fi_guid); 463 if (err == 0) { 464 ds->ds_feature_inuse[f] = B_TRUE; 465 } else { 466 ASSERT3U(err, ==, ENOENT); 467 err = 0; 468 } 469 } 470 } 471 472 err = dsl_dir_hold_obj(dp, 473 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 474 if (err != 0) { 475 mutex_destroy(&ds->ds_lock); 476 mutex_destroy(&ds->ds_opening_lock); 477 mutex_destroy(&ds->ds_sendstream_lock); 478 refcount_destroy(&ds->ds_longholds); 479 bplist_destroy(&ds->ds_pending_deadlist); 480 dsl_deadlist_close(&ds->ds_deadlist); 481 kmem_free(ds, sizeof (dsl_dataset_t)); 482 dmu_buf_rele(dbuf, tag); 483 return (err); 484 } 485 486 if (!ds->ds_is_snapshot) { 487 ds->ds_snapname[0] = '\0'; 488 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 489 err = dsl_dataset_hold_obj(dp, 490 dsl_dataset_phys(ds)->ds_prev_snap_obj, 491 ds, &ds->ds_prev); 492 } 493 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 494 int zaperr = zap_lookup(mos, ds->ds_object, 495 DS_FIELD_BOOKMARK_NAMES, 496 sizeof (ds->ds_bookmarks), 1, 497 &ds->ds_bookmarks); 498 if (zaperr != ENOENT) 499 VERIFY0(zaperr); 500 } 501 } else { 502 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 503 err = dsl_dataset_get_snapname(ds); 504 if (err == 0 && 505 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 506 err = zap_count( 507 ds->ds_dir->dd_pool->dp_meta_objset, 508 dsl_dataset_phys(ds)->ds_userrefs_obj, 509 &ds->ds_userrefs); 510 } 511 } 512 513 if (err == 0 && !ds->ds_is_snapshot) { 514 err = dsl_prop_get_int_ds(ds, 515 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 516 &ds->ds_reserved); 517 if (err == 0) { 518 err = dsl_prop_get_int_ds(ds, 519 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 520 &ds->ds_quota); 521 } 522 } else { 523 ds->ds_reserved = ds->ds_quota = 0; 524 } 525 526 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 527 if (err == 0) 528 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 529 530 if (err != 0 || winner != NULL) { 531 bplist_destroy(&ds->ds_pending_deadlist); 532 dsl_deadlist_close(&ds->ds_deadlist); 533 if (ds->ds_prev) 534 dsl_dataset_rele(ds->ds_prev, ds); 535 dsl_dir_rele(ds->ds_dir, ds); 536 mutex_destroy(&ds->ds_lock); 537 mutex_destroy(&ds->ds_opening_lock); 538 mutex_destroy(&ds->ds_sendstream_lock); 539 refcount_destroy(&ds->ds_longholds); 540 kmem_free(ds, sizeof (dsl_dataset_t)); 541 if (err != 0) { 542 dmu_buf_rele(dbuf, tag); 543 return (err); 544 } 545 ds = winner; 546 } else { 547 ds->ds_fsid_guid = 548 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 549 } 550 } 551 ASSERT3P(ds->ds_dbuf, ==, dbuf); 552 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 553 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 554 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 555 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 556 *dsp = ds; 557 return (0); 558} 559 560int 561dsl_dataset_hold(dsl_pool_t *dp, const char *name, 562 void *tag, dsl_dataset_t **dsp) 563{ 564 dsl_dir_t *dd; 565 const char *snapname; 566 uint64_t obj; 567 int err = 0; 568 dsl_dataset_t *ds; 569 570 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 571 if (err != 0) 572 return (err); 573 574 ASSERT(dsl_pool_config_held(dp)); 575 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 576 if (obj != 0) 577 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 578 else 579 err = SET_ERROR(ENOENT); 580 581 /* we may be looking for a snapshot */ 582 if (err == 0 && snapname != NULL) { 583 dsl_dataset_t *snap_ds; 584 585 if (*snapname++ != '@') { 586 dsl_dataset_rele(ds, tag); 587 dsl_dir_rele(dd, FTAG); 588 return (SET_ERROR(ENOENT)); 589 } 590 591 dprintf("looking for snapshot '%s'\n", snapname); 592 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 593 if (err == 0) 594 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 595 dsl_dataset_rele(ds, tag); 596 597 if (err == 0) { 598 mutex_enter(&snap_ds->ds_lock); 599 if (snap_ds->ds_snapname[0] == 0) 600 (void) strlcpy(snap_ds->ds_snapname, snapname, 601 sizeof (snap_ds->ds_snapname)); 602 mutex_exit(&snap_ds->ds_lock); 603 ds = snap_ds; 604 } 605 } 606 if (err == 0) 607 *dsp = ds; 608 dsl_dir_rele(dd, FTAG); 609 return (err); 610} 611 612int 613dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 614 void *tag, dsl_dataset_t **dsp) 615{ 616 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 617 if (err != 0) 618 return (err); 619 if (!dsl_dataset_tryown(*dsp, tag)) { 620 dsl_dataset_rele(*dsp, tag); 621 *dsp = NULL; 622 return (SET_ERROR(EBUSY)); 623 } 624 return (0); 625} 626 627int 628dsl_dataset_own(dsl_pool_t *dp, const char *name, 629 void *tag, dsl_dataset_t **dsp) 630{ 631 int err = dsl_dataset_hold(dp, name, tag, dsp); 632 if (err != 0) 633 return (err); 634 if (!dsl_dataset_tryown(*dsp, tag)) { 635 dsl_dataset_rele(*dsp, tag); 636 return (SET_ERROR(EBUSY)); 637 } 638 return (0); 639} 640 641/* 642 * See the comment above dsl_pool_hold() for details. In summary, a long 643 * hold is used to prevent destruction of a dataset while the pool hold 644 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 645 * 646 * The dataset and pool must be held when this function is called. After it 647 * is called, the pool hold may be released while the dataset is still held 648 * and accessed. 649 */ 650void 651dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 652{ 653 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 654 (void) refcount_add(&ds->ds_longholds, tag); 655} 656 657void 658dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 659{ 660 (void) refcount_remove(&ds->ds_longholds, tag); 661} 662 663/* Return B_TRUE if there are any long holds on this dataset. */ 664boolean_t 665dsl_dataset_long_held(dsl_dataset_t *ds) 666{ 667 return (!refcount_is_zero(&ds->ds_longholds)); 668} 669 670void 671dsl_dataset_name(dsl_dataset_t *ds, char *name) 672{ 673 if (ds == NULL) { 674 (void) strcpy(name, "mos"); 675 } else { 676 dsl_dir_name(ds->ds_dir, name); 677 VERIFY0(dsl_dataset_get_snapname(ds)); 678 if (ds->ds_snapname[0]) { 679 (void) strcat(name, "@"); 680 /* 681 * We use a "recursive" mutex so that we 682 * can call dprintf_ds() with ds_lock held. 683 */ 684 if (!MUTEX_HELD(&ds->ds_lock)) { 685 mutex_enter(&ds->ds_lock); 686 (void) strcat(name, ds->ds_snapname); 687 mutex_exit(&ds->ds_lock); 688 } else { 689 (void) strcat(name, ds->ds_snapname); 690 } 691 } 692 } 693} 694 695void 696dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 697{ 698 dmu_buf_rele(ds->ds_dbuf, tag); 699} 700 701void 702dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 703{ 704 ASSERT3P(ds->ds_owner, ==, tag); 705 ASSERT(ds->ds_dbuf != NULL); 706 707 mutex_enter(&ds->ds_lock); 708 ds->ds_owner = NULL; 709 mutex_exit(&ds->ds_lock); 710 dsl_dataset_long_rele(ds, tag); 711 dsl_dataset_rele(ds, tag); 712} 713 714boolean_t 715dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 716{ 717 boolean_t gotit = FALSE; 718 719 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 720 mutex_enter(&ds->ds_lock); 721 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 722 ds->ds_owner = tag; 723 dsl_dataset_long_hold(ds, tag); 724 gotit = TRUE; 725 } 726 mutex_exit(&ds->ds_lock); 727 return (gotit); 728} 729 730boolean_t 731dsl_dataset_has_owner(dsl_dataset_t *ds) 732{ 733 boolean_t rv; 734 mutex_enter(&ds->ds_lock); 735 rv = (ds->ds_owner != NULL); 736 mutex_exit(&ds->ds_lock); 737 return (rv); 738} 739 740static void 741dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 742{ 743 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 744 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 745 uint64_t zero = 0; 746 747 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 748 749 spa_feature_incr(spa, f, tx); 750 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 751 752 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 753 sizeof (zero), 1, &zero, tx)); 754} 755 756void 757dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 758{ 759 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 760 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 761 762 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 763 764 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 765 spa_feature_decr(spa, f, tx); 766} 767 768uint64_t 769dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 770 uint64_t flags, dmu_tx_t *tx) 771{ 772 dsl_pool_t *dp = dd->dd_pool; 773 dmu_buf_t *dbuf; 774 dsl_dataset_phys_t *dsphys; 775 uint64_t dsobj; 776 objset_t *mos = dp->dp_meta_objset; 777 778 if (origin == NULL) 779 origin = dp->dp_origin_snap; 780 781 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 782 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 783 ASSERT(dmu_tx_is_syncing(tx)); 784 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 785 786 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 787 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 788 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 789 dmu_buf_will_dirty(dbuf, tx); 790 dsphys = dbuf->db_data; 791 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 792 dsphys->ds_dir_obj = dd->dd_object; 793 dsphys->ds_flags = flags; 794 dsphys->ds_fsid_guid = unique_create(); 795 do { 796 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 797 sizeof (dsphys->ds_guid)); 798 } while (dsphys->ds_guid == 0); 799 dsphys->ds_snapnames_zapobj = 800 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 801 DMU_OT_NONE, 0, tx); 802 dsphys->ds_creation_time = gethrestime_sec(); 803 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 804 805 if (origin == NULL) { 806 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 807 } else { 808 dsl_dataset_t *ohds; /* head of the origin snapshot */ 809 810 dsphys->ds_prev_snap_obj = origin->ds_object; 811 dsphys->ds_prev_snap_txg = 812 dsl_dataset_phys(origin)->ds_creation_txg; 813 dsphys->ds_referenced_bytes = 814 dsl_dataset_phys(origin)->ds_referenced_bytes; 815 dsphys->ds_compressed_bytes = 816 dsl_dataset_phys(origin)->ds_compressed_bytes; 817 dsphys->ds_uncompressed_bytes = 818 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 819 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 820 821 /* 822 * Inherit flags that describe the dataset's contents 823 * (INCONSISTENT) or properties (Case Insensitive). 824 */ 825 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 826 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 827 828 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 829 if (origin->ds_feature_inuse[f]) 830 dsl_dataset_activate_feature(dsobj, f, tx); 831 } 832 833 dmu_buf_will_dirty(origin->ds_dbuf, tx); 834 dsl_dataset_phys(origin)->ds_num_children++; 835 836 VERIFY0(dsl_dataset_hold_obj(dp, 837 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 838 FTAG, &ohds)); 839 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 840 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 841 dsl_dataset_rele(ohds, FTAG); 842 843 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 844 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 845 dsl_dataset_phys(origin)->ds_next_clones_obj = 846 zap_create(mos, 847 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 848 } 849 VERIFY0(zap_add_int(mos, 850 dsl_dataset_phys(origin)->ds_next_clones_obj, 851 dsobj, tx)); 852 } 853 854 dmu_buf_will_dirty(dd->dd_dbuf, tx); 855 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 856 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 857 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 858 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 859 dsl_dir_phys(origin->ds_dir)->dd_clones = 860 zap_create(mos, 861 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 862 } 863 VERIFY0(zap_add_int(mos, 864 dsl_dir_phys(origin->ds_dir)->dd_clones, 865 dsobj, tx)); 866 } 867 } 868 869 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 870 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 871 872 dmu_buf_rele(dbuf, FTAG); 873 874 dmu_buf_will_dirty(dd->dd_dbuf, tx); 875 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 876 877 return (dsobj); 878} 879 880static void 881dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 882{ 883 objset_t *os; 884 885 VERIFY0(dmu_objset_from_ds(ds, &os)); 886 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 887 dsl_dataset_dirty(ds, tx); 888} 889 890uint64_t 891dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 892 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 893{ 894 dsl_pool_t *dp = pdd->dd_pool; 895 uint64_t dsobj, ddobj; 896 dsl_dir_t *dd; 897 898 ASSERT(dmu_tx_is_syncing(tx)); 899 ASSERT(lastname[0] != '@'); 900 901 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 902 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 903 904 dsobj = dsl_dataset_create_sync_dd(dd, origin, 905 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 906 907 dsl_deleg_set_create_perms(dd, tx, cr); 908 909 /* 910 * Since we're creating a new node we know it's a leaf, so we can 911 * initialize the counts if the limit feature is active. 912 */ 913 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 914 uint64_t cnt = 0; 915 objset_t *os = dd->dd_pool->dp_meta_objset; 916 917 dsl_dir_zapify(dd, tx); 918 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 919 sizeof (cnt), 1, &cnt, tx)); 920 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 921 sizeof (cnt), 1, &cnt, tx)); 922 } 923 924 dsl_dir_rele(dd, FTAG); 925 926 /* 927 * If we are creating a clone, make sure we zero out any stale 928 * data from the origin snapshots zil header. 929 */ 930 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 931 dsl_dataset_t *ds; 932 933 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 934 dsl_dataset_zero_zil(ds, tx); 935 dsl_dataset_rele(ds, FTAG); 936 } 937 938 return (dsobj); 939} 940 941#ifdef __FreeBSD__ 942/* FreeBSD ioctl compat begin */ 943struct destroyarg { 944 nvlist_t *nvl; 945 const char *snapname; 946}; 947 948static int 949dsl_check_snap_cb(const char *name, void *arg) 950{ 951 struct destroyarg *da = arg; 952 dsl_dataset_t *ds; 953 char *dsname; 954 955 dsname = kmem_asprintf("%s@%s", name, da->snapname); 956 fnvlist_add_boolean(da->nvl, dsname); 957 kmem_free(dsname, strlen(dsname) + 1); 958 959 return (0); 960} 961 962int 963dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 964 nvlist_t *snaps) 965{ 966 struct destroyarg *da; 967 int err; 968 969 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 970 da->nvl = snaps; 971 da->snapname = snapname; 972 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 973 DS_FIND_CHILDREN); 974 kmem_free(da, sizeof (struct destroyarg)); 975 976 return (err); 977} 978/* FreeBSD ioctl compat end */ 979#endif /* __FreeBSD__ */ 980 981/* 982 * The unique space in the head dataset can be calculated by subtracting 983 * the space used in the most recent snapshot, that is still being used 984 * in this file system, from the space currently in use. To figure out 985 * the space in the most recent snapshot still in use, we need to take 986 * the total space used in the snapshot and subtract out the space that 987 * has been freed up since the snapshot was taken. 988 */ 989void 990dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 991{ 992 uint64_t mrs_used; 993 uint64_t dlused, dlcomp, dluncomp; 994 995 ASSERT(!ds->ds_is_snapshot); 996 997 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 998 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 999 else 1000 mrs_used = 0; 1001 1002 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1003 1004 ASSERT3U(dlused, <=, mrs_used); 1005 dsl_dataset_phys(ds)->ds_unique_bytes = 1006 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1007 1008 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1009 SPA_VERSION_UNIQUE_ACCURATE) 1010 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1011} 1012 1013void 1014dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1015 dmu_tx_t *tx) 1016{ 1017 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1018 uint64_t count; 1019 int err; 1020 1021 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1022 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1023 obj, tx); 1024 /* 1025 * The err should not be ENOENT, but a bug in a previous version 1026 * of the code could cause upgrade_clones_cb() to not set 1027 * ds_next_snap_obj when it should, leading to a missing entry. 1028 * If we knew that the pool was created after 1029 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1030 * ENOENT. However, at least we can check that we don't have 1031 * too many entries in the next_clones_obj even after failing to 1032 * remove this one. 1033 */ 1034 if (err != ENOENT) 1035 VERIFY0(err); 1036 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1037 &count)); 1038 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1039} 1040 1041 1042blkptr_t * 1043dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1044{ 1045 return (&dsl_dataset_phys(ds)->ds_bp); 1046} 1047 1048void 1049dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1050{ 1051 ASSERT(dmu_tx_is_syncing(tx)); 1052 /* If it's the meta-objset, set dp_meta_rootbp */ 1053 if (ds == NULL) { 1054 tx->tx_pool->dp_meta_rootbp = *bp; 1055 } else { 1056 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1057 dsl_dataset_phys(ds)->ds_bp = *bp; 1058 } 1059} 1060 1061spa_t * 1062dsl_dataset_get_spa(dsl_dataset_t *ds) 1063{ 1064 return (ds->ds_dir->dd_pool->dp_spa); 1065} 1066 1067void 1068dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1069{ 1070 dsl_pool_t *dp; 1071 1072 if (ds == NULL) /* this is the meta-objset */ 1073 return; 1074 1075 ASSERT(ds->ds_objset != NULL); 1076 1077 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1078 panic("dirtying snapshot!"); 1079 1080 dp = ds->ds_dir->dd_pool; 1081 1082 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1083 /* up the hold count until we can be written out */ 1084 dmu_buf_add_ref(ds->ds_dbuf, ds); 1085 } 1086} 1087 1088boolean_t 1089dsl_dataset_is_dirty(dsl_dataset_t *ds) 1090{ 1091 for (int t = 0; t < TXG_SIZE; t++) { 1092 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1093 ds, t)) 1094 return (B_TRUE); 1095 } 1096 return (B_FALSE); 1097} 1098 1099static int 1100dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1101{ 1102 uint64_t asize; 1103 1104 if (!dmu_tx_is_syncing(tx)) 1105 return (0); 1106 1107 /* 1108 * If there's an fs-only reservation, any blocks that might become 1109 * owned by the snapshot dataset must be accommodated by space 1110 * outside of the reservation. 1111 */ 1112 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1113 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1114 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1115 return (SET_ERROR(ENOSPC)); 1116 1117 /* 1118 * Propagate any reserved space for this snapshot to other 1119 * snapshot checks in this sync group. 1120 */ 1121 if (asize > 0) 1122 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1123 1124 return (0); 1125} 1126 1127typedef struct dsl_dataset_snapshot_arg { 1128 nvlist_t *ddsa_snaps; 1129 nvlist_t *ddsa_props; 1130 nvlist_t *ddsa_errors; 1131 cred_t *ddsa_cr; 1132} dsl_dataset_snapshot_arg_t; 1133 1134int 1135dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1136 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1137{ 1138 int error; 1139 uint64_t value; 1140 1141 ds->ds_trysnap_txg = tx->tx_txg; 1142 1143 if (!dmu_tx_is_syncing(tx)) 1144 return (0); 1145 1146 /* 1147 * We don't allow multiple snapshots of the same txg. If there 1148 * is already one, try again. 1149 */ 1150 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1151 return (SET_ERROR(EAGAIN)); 1152 1153 /* 1154 * Check for conflicting snapshot name. 1155 */ 1156 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1157 if (error == 0) 1158 return (SET_ERROR(EEXIST)); 1159 if (error != ENOENT) 1160 return (error); 1161 1162 /* 1163 * We don't allow taking snapshots of inconsistent datasets, such as 1164 * those into which we are currently receiving. However, if we are 1165 * creating this snapshot as part of a receive, this check will be 1166 * executed atomically with respect to the completion of the receive 1167 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1168 * case we ignore this, knowing it will be fixed up for us shortly in 1169 * dmu_recv_end_sync(). 1170 */ 1171 if (!recv && DS_IS_INCONSISTENT(ds)) 1172 return (SET_ERROR(EBUSY)); 1173 1174 /* 1175 * Skip the check for temporary snapshots or if we have already checked 1176 * the counts in dsl_dataset_snapshot_check. This means we really only 1177 * check the count here when we're receiving a stream. 1178 */ 1179 if (cnt != 0 && cr != NULL) { 1180 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1181 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1182 if (error != 0) 1183 return (error); 1184 } 1185 1186 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1187 if (error != 0) 1188 return (error); 1189 1190 return (0); 1191} 1192 1193static int 1194dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1195{ 1196 dsl_dataset_snapshot_arg_t *ddsa = arg; 1197 dsl_pool_t *dp = dmu_tx_pool(tx); 1198 nvpair_t *pair; 1199 int rv = 0; 1200 1201 /* 1202 * Pre-compute how many total new snapshots will be created for each 1203 * level in the tree and below. This is needed for validating the 1204 * snapshot limit when either taking a recursive snapshot or when 1205 * taking multiple snapshots. 1206 * 1207 * The problem is that the counts are not actually adjusted when 1208 * we are checking, only when we finally sync. For a single snapshot, 1209 * this is easy, the count will increase by 1 at each node up the tree, 1210 * but its more complicated for the recursive/multiple snapshot case. 1211 * 1212 * The dsl_fs_ss_limit_check function does recursively check the count 1213 * at each level up the tree but since it is validating each snapshot 1214 * independently we need to be sure that we are validating the complete 1215 * count for the entire set of snapshots. We do this by rolling up the 1216 * counts for each component of the name into an nvlist and then 1217 * checking each of those cases with the aggregated count. 1218 * 1219 * This approach properly handles not only the recursive snapshot 1220 * case (where we get all of those on the ddsa_snaps list) but also 1221 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1222 * validate the limit on 'a' using a count of 2). 1223 * 1224 * We validate the snapshot names in the third loop and only report 1225 * name errors once. 1226 */ 1227 if (dmu_tx_is_syncing(tx)) { 1228 nvlist_t *cnt_track = NULL; 1229 cnt_track = fnvlist_alloc(); 1230 1231 /* Rollup aggregated counts into the cnt_track list */ 1232 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1233 pair != NULL; 1234 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1235 char *pdelim; 1236 uint64_t val; 1237 char nm[MAXPATHLEN]; 1238 1239 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1240 pdelim = strchr(nm, '@'); 1241 if (pdelim == NULL) 1242 continue; 1243 *pdelim = '\0'; 1244 1245 do { 1246 if (nvlist_lookup_uint64(cnt_track, nm, 1247 &val) == 0) { 1248 /* update existing entry */ 1249 fnvlist_add_uint64(cnt_track, nm, 1250 val + 1); 1251 } else { 1252 /* add to list */ 1253 fnvlist_add_uint64(cnt_track, nm, 1); 1254 } 1255 1256 pdelim = strrchr(nm, '/'); 1257 if (pdelim != NULL) 1258 *pdelim = '\0'; 1259 } while (pdelim != NULL); 1260 } 1261 1262 /* Check aggregated counts at each level */ 1263 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1264 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1265 int error = 0; 1266 char *name; 1267 uint64_t cnt = 0; 1268 dsl_dataset_t *ds; 1269 1270 name = nvpair_name(pair); 1271 cnt = fnvpair_value_uint64(pair); 1272 ASSERT(cnt > 0); 1273 1274 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1275 if (error == 0) { 1276 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1277 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1278 ddsa->ddsa_cr); 1279 dsl_dataset_rele(ds, FTAG); 1280 } 1281 1282 if (error != 0) { 1283 if (ddsa->ddsa_errors != NULL) 1284 fnvlist_add_int32(ddsa->ddsa_errors, 1285 name, error); 1286 rv = error; 1287 /* only report one error for this check */ 1288 break; 1289 } 1290 } 1291 nvlist_free(cnt_track); 1292 } 1293 1294 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1295 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1296 int error = 0; 1297 dsl_dataset_t *ds; 1298 char *name, *atp; 1299 char dsname[MAXNAMELEN]; 1300 1301 name = nvpair_name(pair); 1302 if (strlen(name) >= MAXNAMELEN) 1303 error = SET_ERROR(ENAMETOOLONG); 1304 if (error == 0) { 1305 atp = strchr(name, '@'); 1306 if (atp == NULL) 1307 error = SET_ERROR(EINVAL); 1308 if (error == 0) 1309 (void) strlcpy(dsname, name, atp - name + 1); 1310 } 1311 if (error == 0) 1312 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1313 if (error == 0) { 1314 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1315 error = dsl_dataset_snapshot_check_impl(ds, 1316 atp + 1, tx, B_FALSE, 0, NULL); 1317 dsl_dataset_rele(ds, FTAG); 1318 } 1319 1320 if (error != 0) { 1321 if (ddsa->ddsa_errors != NULL) { 1322 fnvlist_add_int32(ddsa->ddsa_errors, 1323 name, error); 1324 } 1325 rv = error; 1326 } 1327 } 1328 1329 return (rv); 1330} 1331 1332void 1333dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1334 dmu_tx_t *tx) 1335{ 1336 static zil_header_t zero_zil; 1337 1338 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1339 dmu_buf_t *dbuf; 1340 dsl_dataset_phys_t *dsphys; 1341 uint64_t dsobj, crtxg; 1342 objset_t *mos = dp->dp_meta_objset; 1343 objset_t *os; 1344 1345 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1346 1347 /* 1348 * If we are on an old pool, the zil must not be active, in which 1349 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1350 */ 1351 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1352 dmu_objset_from_ds(ds, &os) != 0 || 1353 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1354 sizeof (zero_zil)) == 0); 1355 1356 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1357 1358 /* 1359 * The origin's ds_creation_txg has to be < TXG_INITIAL 1360 */ 1361 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1362 crtxg = 1; 1363 else 1364 crtxg = tx->tx_txg; 1365 1366 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1367 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1368 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1369 dmu_buf_will_dirty(dbuf, tx); 1370 dsphys = dbuf->db_data; 1371 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1372 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1373 dsphys->ds_fsid_guid = unique_create(); 1374 do { 1375 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1376 sizeof (dsphys->ds_guid)); 1377 } while (dsphys->ds_guid == 0); 1378 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1379 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1380 dsphys->ds_next_snap_obj = ds->ds_object; 1381 dsphys->ds_num_children = 1; 1382 dsphys->ds_creation_time = gethrestime_sec(); 1383 dsphys->ds_creation_txg = crtxg; 1384 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1385 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1386 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1387 dsphys->ds_uncompressed_bytes = 1388 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1389 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1390 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1391 dmu_buf_rele(dbuf, FTAG); 1392 1393 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1394 if (ds->ds_feature_inuse[f]) 1395 dsl_dataset_activate_feature(dsobj, f, tx); 1396 } 1397 1398 ASSERT3U(ds->ds_prev != 0, ==, 1399 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1400 if (ds->ds_prev) { 1401 uint64_t next_clones_obj = 1402 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1403 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1404 ds->ds_object || 1405 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1406 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1407 ds->ds_object) { 1408 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1409 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1410 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1411 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1412 } else if (next_clones_obj != 0) { 1413 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1414 dsphys->ds_next_snap_obj, tx); 1415 VERIFY0(zap_add_int(mos, 1416 next_clones_obj, dsobj, tx)); 1417 } 1418 } 1419 1420 /* 1421 * If we have a reference-reservation on this dataset, we will 1422 * need to increase the amount of refreservation being charged 1423 * since our unique space is going to zero. 1424 */ 1425 if (ds->ds_reserved) { 1426 int64_t delta; 1427 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1428 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1429 ds->ds_reserved); 1430 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1431 delta, 0, 0, tx); 1432 } 1433 1434 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1435 dsl_dataset_phys(ds)->ds_deadlist_obj = 1436 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1437 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1438 dsl_deadlist_close(&ds->ds_deadlist); 1439 dsl_deadlist_open(&ds->ds_deadlist, mos, 1440 dsl_dataset_phys(ds)->ds_deadlist_obj); 1441 dsl_deadlist_add_key(&ds->ds_deadlist, 1442 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1443 1444 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1445 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1446 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1447 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1448 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1449 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1450 1451 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1452 snapname, 8, 1, &dsobj, tx)); 1453 1454 if (ds->ds_prev) 1455 dsl_dataset_rele(ds->ds_prev, ds); 1456 VERIFY0(dsl_dataset_hold_obj(dp, 1457 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1458 1459 dsl_scan_ds_snapshotted(ds, tx); 1460 1461 dsl_dir_snap_cmtime_update(ds->ds_dir); 1462 1463 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1464} 1465 1466static void 1467dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1468{ 1469 dsl_dataset_snapshot_arg_t *ddsa = arg; 1470 dsl_pool_t *dp = dmu_tx_pool(tx); 1471 nvpair_t *pair; 1472 1473 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1474 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1475 dsl_dataset_t *ds; 1476 char *name, *atp; 1477 char dsname[MAXNAMELEN]; 1478 1479 name = nvpair_name(pair); 1480 atp = strchr(name, '@'); 1481 (void) strlcpy(dsname, name, atp - name + 1); 1482 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1483 1484 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1485 if (ddsa->ddsa_props != NULL) { 1486 dsl_props_set_sync_impl(ds->ds_prev, 1487 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1488 } 1489 dsl_dataset_rele(ds, FTAG); 1490 } 1491} 1492 1493/* 1494 * The snapshots must all be in the same pool. 1495 * All-or-nothing: if there are any failures, nothing will be modified. 1496 */ 1497int 1498dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1499{ 1500 dsl_dataset_snapshot_arg_t ddsa; 1501 nvpair_t *pair; 1502 boolean_t needsuspend; 1503 int error; 1504 spa_t *spa; 1505 char *firstname; 1506 nvlist_t *suspended = NULL; 1507 1508 pair = nvlist_next_nvpair(snaps, NULL); 1509 if (pair == NULL) 1510 return (0); 1511 firstname = nvpair_name(pair); 1512 1513 error = spa_open(firstname, &spa, FTAG); 1514 if (error != 0) 1515 return (error); 1516 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1517 spa_close(spa, FTAG); 1518 1519 if (needsuspend) { 1520 suspended = fnvlist_alloc(); 1521 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1522 pair = nvlist_next_nvpair(snaps, pair)) { 1523 char fsname[MAXNAMELEN]; 1524 char *snapname = nvpair_name(pair); 1525 char *atp; 1526 void *cookie; 1527 1528 atp = strchr(snapname, '@'); 1529 if (atp == NULL) { 1530 error = SET_ERROR(EINVAL); 1531 break; 1532 } 1533 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1534 1535 error = zil_suspend(fsname, &cookie); 1536 if (error != 0) 1537 break; 1538 fnvlist_add_uint64(suspended, fsname, 1539 (uintptr_t)cookie); 1540 } 1541 } 1542 1543 ddsa.ddsa_snaps = snaps; 1544 ddsa.ddsa_props = props; 1545 ddsa.ddsa_errors = errors; 1546 ddsa.ddsa_cr = CRED(); 1547 1548 if (error == 0) { 1549 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1550 dsl_dataset_snapshot_sync, &ddsa, 1551 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1552 } 1553 1554 if (suspended != NULL) { 1555 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1556 pair = nvlist_next_nvpair(suspended, pair)) { 1557 zil_resume((void *)(uintptr_t) 1558 fnvpair_value_uint64(pair)); 1559 } 1560 fnvlist_free(suspended); 1561 } 1562 1563#ifdef __FreeBSD__ 1564#ifdef _KERNEL 1565 if (error == 0) { 1566 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1567 pair = nvlist_next_nvpair(snaps, pair)) { 1568 char *snapname = nvpair_name(pair); 1569 zvol_create_minors(snapname); 1570 } 1571 } 1572#endif 1573#endif 1574 return (error); 1575} 1576 1577typedef struct dsl_dataset_snapshot_tmp_arg { 1578 const char *ddsta_fsname; 1579 const char *ddsta_snapname; 1580 minor_t ddsta_cleanup_minor; 1581 const char *ddsta_htag; 1582} dsl_dataset_snapshot_tmp_arg_t; 1583 1584static int 1585dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1586{ 1587 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1588 dsl_pool_t *dp = dmu_tx_pool(tx); 1589 dsl_dataset_t *ds; 1590 int error; 1591 1592 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1593 if (error != 0) 1594 return (error); 1595 1596 /* NULL cred means no limit check for tmp snapshot */ 1597 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1598 tx, B_FALSE, 0, NULL); 1599 if (error != 0) { 1600 dsl_dataset_rele(ds, FTAG); 1601 return (error); 1602 } 1603 1604 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1605 dsl_dataset_rele(ds, FTAG); 1606 return (SET_ERROR(ENOTSUP)); 1607 } 1608 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1609 B_TRUE, tx); 1610 if (error != 0) { 1611 dsl_dataset_rele(ds, FTAG); 1612 return (error); 1613 } 1614 1615 dsl_dataset_rele(ds, FTAG); 1616 return (0); 1617} 1618 1619static void 1620dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1621{ 1622 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1623 dsl_pool_t *dp = dmu_tx_pool(tx); 1624 dsl_dataset_t *ds; 1625 1626 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1627 1628 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1629 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1630 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1631 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1632 1633 dsl_dataset_rele(ds, FTAG); 1634} 1635 1636int 1637dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1638 minor_t cleanup_minor, const char *htag) 1639{ 1640 dsl_dataset_snapshot_tmp_arg_t ddsta; 1641 int error; 1642 spa_t *spa; 1643 boolean_t needsuspend; 1644 void *cookie; 1645 1646 ddsta.ddsta_fsname = fsname; 1647 ddsta.ddsta_snapname = snapname; 1648 ddsta.ddsta_cleanup_minor = cleanup_minor; 1649 ddsta.ddsta_htag = htag; 1650 1651 error = spa_open(fsname, &spa, FTAG); 1652 if (error != 0) 1653 return (error); 1654 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1655 spa_close(spa, FTAG); 1656 1657 if (needsuspend) { 1658 error = zil_suspend(fsname, &cookie); 1659 if (error != 0) 1660 return (error); 1661 } 1662 1663 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1664 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1665 1666 if (needsuspend) 1667 zil_resume(cookie); 1668 return (error); 1669} 1670 1671 1672void 1673dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1674{ 1675 ASSERT(dmu_tx_is_syncing(tx)); 1676 ASSERT(ds->ds_objset != NULL); 1677 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1678 1679 /* 1680 * in case we had to change ds_fsid_guid when we opened it, 1681 * sync it out now. 1682 */ 1683 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1684 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1685 1686 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1687 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1688 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1689 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1690 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1691 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1692 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1693 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1694 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1695 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1696 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1697 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1698 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1699 } 1700 1701 dmu_objset_sync(ds->ds_objset, zio, tx); 1702 1703 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1704 if (ds->ds_feature_activation_needed[f]) { 1705 if (ds->ds_feature_inuse[f]) 1706 continue; 1707 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1708 ds->ds_feature_inuse[f] = B_TRUE; 1709 } 1710 } 1711} 1712 1713static void 1714get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1715{ 1716 uint64_t count = 0; 1717 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1718 zap_cursor_t zc; 1719 zap_attribute_t za; 1720 nvlist_t *propval = fnvlist_alloc(); 1721 nvlist_t *val = fnvlist_alloc(); 1722 1723 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1724 1725 /* 1726 * There may be missing entries in ds_next_clones_obj 1727 * due to a bug in a previous version of the code. 1728 * Only trust it if it has the right number of entries. 1729 */ 1730 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1731 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1732 &count)); 1733 } 1734 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1735 goto fail; 1736 for (zap_cursor_init(&zc, mos, 1737 dsl_dataset_phys(ds)->ds_next_clones_obj); 1738 zap_cursor_retrieve(&zc, &za) == 0; 1739 zap_cursor_advance(&zc)) { 1740 dsl_dataset_t *clone; 1741 char buf[ZFS_MAXNAMELEN]; 1742 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1743 za.za_first_integer, FTAG, &clone)); 1744 dsl_dir_name(clone->ds_dir, buf); 1745 fnvlist_add_boolean(val, buf); 1746 dsl_dataset_rele(clone, FTAG); 1747 } 1748 zap_cursor_fini(&zc); 1749 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1750 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1751fail: 1752 nvlist_free(val); 1753 nvlist_free(propval); 1754} 1755 1756static void 1757get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1758{ 1759 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1760 1761 if (dsl_dataset_has_resume_receive_state(ds)) { 1762 char *str; 1763 void *packed; 1764 uint8_t *compressed; 1765 uint64_t val; 1766 nvlist_t *token_nv = fnvlist_alloc(); 1767 size_t packed_size, compressed_size; 1768 1769 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1770 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1771 fnvlist_add_uint64(token_nv, "fromguid", val); 1772 } 1773 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1774 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1775 fnvlist_add_uint64(token_nv, "object", val); 1776 } 1777 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1778 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1779 fnvlist_add_uint64(token_nv, "offset", val); 1780 } 1781 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1782 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1783 fnvlist_add_uint64(token_nv, "bytes", val); 1784 } 1785 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1786 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1787 fnvlist_add_uint64(token_nv, "toguid", val); 1788 } 1789 char buf[256]; 1790 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1791 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1792 fnvlist_add_string(token_nv, "toname", buf); 1793 } 1794 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1795 DS_FIELD_RESUME_EMBEDOK) == 0) { 1796 fnvlist_add_boolean(token_nv, "embedok"); 1797 } 1798 packed = fnvlist_pack(token_nv, &packed_size); 1799 fnvlist_free(token_nv); 1800 compressed = kmem_alloc(packed_size, KM_SLEEP); 1801 1802 compressed_size = gzip_compress(packed, compressed, 1803 packed_size, packed_size, 6); 1804 1805 zio_cksum_t cksum; 1806 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1807 1808 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1809 for (int i = 0; i < compressed_size; i++) { 1810 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1811 } 1812 str[compressed_size * 2] = '\0'; 1813 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1814 ZFS_SEND_RESUME_TOKEN_VERSION, 1815 (longlong_t)cksum.zc_word[0], 1816 (longlong_t)packed_size, str); 1817 dsl_prop_nvlist_add_string(nv, 1818 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1819 kmem_free(packed, packed_size); 1820 kmem_free(str, compressed_size * 2 + 1); 1821 kmem_free(compressed, packed_size); 1822 strfree(propval); 1823 } 1824} 1825 1826void 1827dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1828{ 1829 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1830 uint64_t refd, avail, uobjs, aobjs, ratio; 1831 1832 ASSERT(dsl_pool_config_held(dp)); 1833 1834 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1835 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1836 dsl_dataset_phys(ds)->ds_compressed_bytes); 1837 1838 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1839 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1840 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1841 1842 if (ds->ds_is_snapshot) { 1843 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1844 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1845 dsl_dataset_phys(ds)->ds_unique_bytes); 1846 get_clones_stat(ds, nv); 1847 } else { 1848 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1849 char buf[MAXNAMELEN]; 1850 dsl_dataset_name(ds->ds_prev, buf); 1851 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1852 } 1853 1854 dsl_dir_stats(ds->ds_dir, nv); 1855 } 1856 1857 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1858 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1859 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1860 1861 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1862 dsl_dataset_phys(ds)->ds_creation_time); 1863 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1864 dsl_dataset_phys(ds)->ds_creation_txg); 1865 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1866 ds->ds_quota); 1867 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1868 ds->ds_reserved); 1869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1870 dsl_dataset_phys(ds)->ds_guid); 1871 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1872 dsl_dataset_phys(ds)->ds_unique_bytes); 1873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1874 ds->ds_object); 1875 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1876 ds->ds_userrefs); 1877 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1878 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1879 1880 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1881 uint64_t written, comp, uncomp; 1882 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1883 dsl_dataset_t *prev; 1884 1885 int err = dsl_dataset_hold_obj(dp, 1886 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1887 if (err == 0) { 1888 err = dsl_dataset_space_written(prev, ds, &written, 1889 &comp, &uncomp); 1890 dsl_dataset_rele(prev, FTAG); 1891 if (err == 0) { 1892 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1893 written); 1894 } 1895 } 1896 } 1897 1898 if (!dsl_dataset_is_snapshot(ds)) { 1899 /* 1900 * A failed "newfs" (e.g. full) resumable receive leaves 1901 * the stats set on this dataset. Check here for the prop. 1902 */ 1903 get_receive_resume_stats(ds, nv); 1904 1905 /* 1906 * A failed incremental resumable receive leaves the 1907 * stats set on our child named "%recv". Check the child 1908 * for the prop. 1909 */ 1910 char recvname[ZFS_MAXNAMELEN]; 1911 dsl_dataset_t *recv_ds; 1912 dsl_dataset_name(ds, recvname); 1913 (void) strcat(recvname, "/"); 1914 (void) strcat(recvname, recv_clone_name); 1915 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1916 get_receive_resume_stats(recv_ds, nv); 1917 dsl_dataset_rele(recv_ds, FTAG); 1918 } 1919 } 1920} 1921 1922void 1923dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1924{ 1925 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1926 ASSERT(dsl_pool_config_held(dp)); 1927 1928 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1929 stat->dds_inconsistent = 1930 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1931 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1932 stat->dds_origin[0] = '\0'; 1933 if (ds->ds_is_snapshot) { 1934 stat->dds_is_snapshot = B_TRUE; 1935 stat->dds_num_clones = 1936 dsl_dataset_phys(ds)->ds_num_children - 1; 1937 } else { 1938 stat->dds_is_snapshot = B_FALSE; 1939 stat->dds_num_clones = 0; 1940 1941 if (dsl_dir_is_clone(ds->ds_dir)) { 1942 dsl_dataset_t *ods; 1943 1944 VERIFY0(dsl_dataset_hold_obj(dp, 1945 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1946 FTAG, &ods)); 1947 dsl_dataset_name(ods, stat->dds_origin); 1948 dsl_dataset_rele(ods, FTAG); 1949 } 1950 } 1951} 1952 1953uint64_t 1954dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1955{ 1956 return (ds->ds_fsid_guid); 1957} 1958 1959void 1960dsl_dataset_space(dsl_dataset_t *ds, 1961 uint64_t *refdbytesp, uint64_t *availbytesp, 1962 uint64_t *usedobjsp, uint64_t *availobjsp) 1963{ 1964 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1965 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1966 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1967 *availbytesp += 1968 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1969 if (ds->ds_quota != 0) { 1970 /* 1971 * Adjust available bytes according to refquota 1972 */ 1973 if (*refdbytesp < ds->ds_quota) 1974 *availbytesp = MIN(*availbytesp, 1975 ds->ds_quota - *refdbytesp); 1976 else 1977 *availbytesp = 0; 1978 } 1979 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1980 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1981} 1982 1983boolean_t 1984dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1985{ 1986 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1987 1988 ASSERT(dsl_pool_config_held(dp)); 1989 if (snap == NULL) 1990 return (B_FALSE); 1991 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1992 dsl_dataset_phys(snap)->ds_creation_txg) { 1993 objset_t *os, *os_snap; 1994 /* 1995 * It may be that only the ZIL differs, because it was 1996 * reset in the head. Don't count that as being 1997 * modified. 1998 */ 1999 if (dmu_objset_from_ds(ds, &os) != 0) 2000 return (B_TRUE); 2001 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2002 return (B_TRUE); 2003 return (bcmp(&os->os_phys->os_meta_dnode, 2004 &os_snap->os_phys->os_meta_dnode, 2005 sizeof (os->os_phys->os_meta_dnode)) != 0); 2006 } 2007 return (B_FALSE); 2008} 2009 2010typedef struct dsl_dataset_rename_snapshot_arg { 2011 const char *ddrsa_fsname; 2012 const char *ddrsa_oldsnapname; 2013 const char *ddrsa_newsnapname; 2014 boolean_t ddrsa_recursive; 2015 dmu_tx_t *ddrsa_tx; 2016} dsl_dataset_rename_snapshot_arg_t; 2017 2018/* ARGSUSED */ 2019static int 2020dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2021 dsl_dataset_t *hds, void *arg) 2022{ 2023 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2024 int error; 2025 uint64_t val; 2026 2027 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2028 if (error != 0) { 2029 /* ignore nonexistent snapshots */ 2030 return (error == ENOENT ? 0 : error); 2031 } 2032 2033 /* new name should not exist */ 2034 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2035 if (error == 0) 2036 error = SET_ERROR(EEXIST); 2037 else if (error == ENOENT) 2038 error = 0; 2039 2040 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2041 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2042 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 2043 error = SET_ERROR(ENAMETOOLONG); 2044 2045 return (error); 2046} 2047 2048static int 2049dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2050{ 2051 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2052 dsl_pool_t *dp = dmu_tx_pool(tx); 2053 dsl_dataset_t *hds; 2054 int error; 2055 2056 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2057 if (error != 0) 2058 return (error); 2059 2060 if (ddrsa->ddrsa_recursive) { 2061 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2062 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2063 DS_FIND_CHILDREN); 2064 } else { 2065 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2066 } 2067 dsl_dataset_rele(hds, FTAG); 2068 return (error); 2069} 2070 2071static int 2072dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2073 dsl_dataset_t *hds, void *arg) 2074{ 2075#ifdef __FreeBSD__ 2076#ifdef _KERNEL 2077 char *oldname, *newname; 2078#endif 2079#endif 2080 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2081 dsl_dataset_t *ds; 2082 uint64_t val; 2083 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2084 int error; 2085 2086 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2087 ASSERT(error == 0 || error == ENOENT); 2088 if (error == ENOENT) { 2089 /* ignore nonexistent snapshots */ 2090 return (0); 2091 } 2092 2093 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2094 2095 /* log before we change the name */ 2096 spa_history_log_internal_ds(ds, "rename", tx, 2097 "-> @%s", ddrsa->ddrsa_newsnapname); 2098 2099 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2100 B_FALSE)); 2101 mutex_enter(&ds->ds_lock); 2102 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2103 mutex_exit(&ds->ds_lock); 2104 VERIFY0(zap_add(dp->dp_meta_objset, 2105 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2106 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2107 2108#ifdef __FreeBSD__ 2109#ifdef _KERNEL 2110 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2111 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2112 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2113 ddrsa->ddrsa_oldsnapname); 2114 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2115 ddrsa->ddrsa_newsnapname); 2116 zfsvfs_update_fromname(oldname, newname); 2117 zvol_rename_minors(oldname, newname); 2118 kmem_free(newname, MAXPATHLEN); 2119 kmem_free(oldname, MAXPATHLEN); 2120#endif 2121#endif 2122 dsl_dataset_rele(ds, FTAG); 2123 2124 return (0); 2125} 2126 2127static void 2128dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2129{ 2130 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2131 dsl_pool_t *dp = dmu_tx_pool(tx); 2132 dsl_dataset_t *hds; 2133 2134 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2135 ddrsa->ddrsa_tx = tx; 2136 if (ddrsa->ddrsa_recursive) { 2137 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2138 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2139 DS_FIND_CHILDREN)); 2140 } else { 2141 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2142 } 2143 dsl_dataset_rele(hds, FTAG); 2144} 2145 2146int 2147dsl_dataset_rename_snapshot(const char *fsname, 2148 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2149{ 2150 dsl_dataset_rename_snapshot_arg_t ddrsa; 2151 2152 ddrsa.ddrsa_fsname = fsname; 2153 ddrsa.ddrsa_oldsnapname = oldsnapname; 2154 ddrsa.ddrsa_newsnapname = newsnapname; 2155 ddrsa.ddrsa_recursive = recursive; 2156 2157 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2158 dsl_dataset_rename_snapshot_sync, &ddrsa, 2159 1, ZFS_SPACE_CHECK_RESERVED)); 2160} 2161 2162/* 2163 * If we're doing an ownership handoff, we need to make sure that there is 2164 * only one long hold on the dataset. We're not allowed to change anything here 2165 * so we don't permanently release the long hold or regular hold here. We want 2166 * to do this only when syncing to avoid the dataset unexpectedly going away 2167 * when we release the long hold. 2168 */ 2169static int 2170dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2171{ 2172 boolean_t held; 2173 2174 if (!dmu_tx_is_syncing(tx)) 2175 return (0); 2176 2177 if (owner != NULL) { 2178 VERIFY3P(ds->ds_owner, ==, owner); 2179 dsl_dataset_long_rele(ds, owner); 2180 } 2181 2182 held = dsl_dataset_long_held(ds); 2183 2184 if (owner != NULL) 2185 dsl_dataset_long_hold(ds, owner); 2186 2187 if (held) 2188 return (SET_ERROR(EBUSY)); 2189 2190 return (0); 2191} 2192 2193typedef struct dsl_dataset_rollback_arg { 2194 const char *ddra_fsname; 2195 void *ddra_owner; 2196 nvlist_t *ddra_result; 2197} dsl_dataset_rollback_arg_t; 2198 2199static int 2200dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2201{ 2202 dsl_dataset_rollback_arg_t *ddra = arg; 2203 dsl_pool_t *dp = dmu_tx_pool(tx); 2204 dsl_dataset_t *ds; 2205 int64_t unused_refres_delta; 2206 int error; 2207 2208 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2209 if (error != 0) 2210 return (error); 2211 2212 /* must not be a snapshot */ 2213 if (ds->ds_is_snapshot) { 2214 dsl_dataset_rele(ds, FTAG); 2215 return (SET_ERROR(EINVAL)); 2216 } 2217 2218 /* must have a most recent snapshot */ 2219 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2220 dsl_dataset_rele(ds, FTAG); 2221 return (SET_ERROR(EINVAL)); 2222 } 2223 2224 /* must not have any bookmarks after the most recent snapshot */ 2225 nvlist_t *proprequest = fnvlist_alloc(); 2226 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2227 nvlist_t *bookmarks = fnvlist_alloc(); 2228 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2229 fnvlist_free(proprequest); 2230 if (error != 0) 2231 return (error); 2232 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2233 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2234 nvlist_t *valuenv = 2235 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2236 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2237 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2238 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2239 fnvlist_free(bookmarks); 2240 dsl_dataset_rele(ds, FTAG); 2241 return (SET_ERROR(EEXIST)); 2242 } 2243 } 2244 fnvlist_free(bookmarks); 2245 2246 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2247 if (error != 0) { 2248 dsl_dataset_rele(ds, FTAG); 2249 return (error); 2250 } 2251 2252 /* 2253 * Check if the snap we are rolling back to uses more than 2254 * the refquota. 2255 */ 2256 if (ds->ds_quota != 0 && 2257 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2258 dsl_dataset_rele(ds, FTAG); 2259 return (SET_ERROR(EDQUOT)); 2260 } 2261 2262 /* 2263 * When we do the clone swap, we will temporarily use more space 2264 * due to the refreservation (the head will no longer have any 2265 * unique space, so the entire amount of the refreservation will need 2266 * to be free). We will immediately destroy the clone, freeing 2267 * this space, but the freeing happens over many txg's. 2268 */ 2269 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2270 dsl_dataset_phys(ds)->ds_unique_bytes); 2271 2272 if (unused_refres_delta > 0 && 2273 unused_refres_delta > 2274 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2275 dsl_dataset_rele(ds, FTAG); 2276 return (SET_ERROR(ENOSPC)); 2277 } 2278 2279 dsl_dataset_rele(ds, FTAG); 2280 return (0); 2281} 2282 2283static void 2284dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2285{ 2286 dsl_dataset_rollback_arg_t *ddra = arg; 2287 dsl_pool_t *dp = dmu_tx_pool(tx); 2288 dsl_dataset_t *ds, *clone; 2289 uint64_t cloneobj; 2290 char namebuf[ZFS_MAXNAMELEN]; 2291 2292 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2293 2294 dsl_dataset_name(ds->ds_prev, namebuf); 2295 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2296 2297 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2298 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2299 2300 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2301 2302 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2303 dsl_dataset_zero_zil(ds, tx); 2304 2305 dsl_destroy_head_sync_impl(clone, tx); 2306 2307 dsl_dataset_rele(clone, FTAG); 2308 dsl_dataset_rele(ds, FTAG); 2309} 2310 2311/* 2312 * Rolls back the given filesystem or volume to the most recent snapshot. 2313 * The name of the most recent snapshot will be returned under key "target" 2314 * in the result nvlist. 2315 * 2316 * If owner != NULL: 2317 * - The existing dataset MUST be owned by the specified owner at entry 2318 * - Upon return, dataset will still be held by the same owner, whether we 2319 * succeed or not. 2320 * 2321 * This mode is required any time the existing filesystem is mounted. See 2322 * notes above zfs_suspend_fs() for further details. 2323 */ 2324int 2325dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2326{ 2327 dsl_dataset_rollback_arg_t ddra; 2328 2329 ddra.ddra_fsname = fsname; 2330 ddra.ddra_owner = owner; 2331 ddra.ddra_result = result; 2332 2333 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2334 dsl_dataset_rollback_sync, &ddra, 2335 1, ZFS_SPACE_CHECK_RESERVED)); 2336} 2337 2338struct promotenode { 2339 list_node_t link; 2340 dsl_dataset_t *ds; 2341}; 2342 2343typedef struct dsl_dataset_promote_arg { 2344 const char *ddpa_clonename; 2345 dsl_dataset_t *ddpa_clone; 2346 list_t shared_snaps, origin_snaps, clone_snaps; 2347 dsl_dataset_t *origin_origin; /* origin of the origin */ 2348 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2349 char *err_ds; 2350 cred_t *cr; 2351} dsl_dataset_promote_arg_t; 2352 2353static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2354static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2355 void *tag); 2356static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2357 2358static int 2359dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2360{ 2361 dsl_dataset_promote_arg_t *ddpa = arg; 2362 dsl_pool_t *dp = dmu_tx_pool(tx); 2363 dsl_dataset_t *hds; 2364 struct promotenode *snap; 2365 dsl_dataset_t *origin_ds; 2366 int err; 2367 uint64_t unused; 2368 uint64_t ss_mv_cnt; 2369 size_t max_snap_len; 2370 2371 err = promote_hold(ddpa, dp, FTAG); 2372 if (err != 0) 2373 return (err); 2374 2375 hds = ddpa->ddpa_clone; 2376 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2377 2378 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2379 promote_rele(ddpa, FTAG); 2380 return (SET_ERROR(EXDEV)); 2381 } 2382 2383 /* 2384 * Compute and check the amount of space to transfer. Since this is 2385 * so expensive, don't do the preliminary check. 2386 */ 2387 if (!dmu_tx_is_syncing(tx)) { 2388 promote_rele(ddpa, FTAG); 2389 return (0); 2390 } 2391 2392 snap = list_head(&ddpa->shared_snaps); 2393 origin_ds = snap->ds; 2394 2395 /* compute origin's new unique space */ 2396 snap = list_tail(&ddpa->clone_snaps); 2397 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2398 origin_ds->ds_object); 2399 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2400 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2401 &ddpa->unique, &unused, &unused); 2402 2403 /* 2404 * Walk the snapshots that we are moving 2405 * 2406 * Compute space to transfer. Consider the incremental changes 2407 * to used by each snapshot: 2408 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2409 * So each snapshot gave birth to: 2410 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2411 * So a sequence would look like: 2412 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2413 * Which simplifies to: 2414 * uN + kN + kN-1 + ... + k1 + k0 2415 * Note however, if we stop before we reach the ORIGIN we get: 2416 * uN + kN + kN-1 + ... + kM - uM-1 2417 */ 2418 ss_mv_cnt = 0; 2419 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2420 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2421 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2422 for (snap = list_head(&ddpa->shared_snaps); snap; 2423 snap = list_next(&ddpa->shared_snaps, snap)) { 2424 uint64_t val, dlused, dlcomp, dluncomp; 2425 dsl_dataset_t *ds = snap->ds; 2426 2427 ss_mv_cnt++; 2428 2429 /* 2430 * If there are long holds, we won't be able to evict 2431 * the objset. 2432 */ 2433 if (dsl_dataset_long_held(ds)) { 2434 err = SET_ERROR(EBUSY); 2435 goto out; 2436 } 2437 2438 /* Check that the snapshot name does not conflict */ 2439 VERIFY0(dsl_dataset_get_snapname(ds)); 2440 if (strlen(ds->ds_snapname) >= max_snap_len) { 2441 err = SET_ERROR(ENAMETOOLONG); 2442 goto out; 2443 } 2444 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2445 if (err == 0) { 2446 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2447 err = SET_ERROR(EEXIST); 2448 goto out; 2449 } 2450 if (err != ENOENT) 2451 goto out; 2452 2453 /* The very first snapshot does not have a deadlist */ 2454 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2455 continue; 2456 2457 dsl_deadlist_space(&ds->ds_deadlist, 2458 &dlused, &dlcomp, &dluncomp); 2459 ddpa->used += dlused; 2460 ddpa->comp += dlcomp; 2461 ddpa->uncomp += dluncomp; 2462 } 2463 2464 /* 2465 * If we are a clone of a clone then we never reached ORIGIN, 2466 * so we need to subtract out the clone origin's used space. 2467 */ 2468 if (ddpa->origin_origin) { 2469 ddpa->used -= 2470 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2471 ddpa->comp -= 2472 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2473 ddpa->uncomp -= 2474 dsl_dataset_phys(ddpa->origin_origin)-> 2475 ds_uncompressed_bytes; 2476 } 2477 2478 /* Check that there is enough space and limit headroom here */ 2479 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2480 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2481 if (err != 0) 2482 goto out; 2483 2484 /* 2485 * Compute the amounts of space that will be used by snapshots 2486 * after the promotion (for both origin and clone). For each, 2487 * it is the amount of space that will be on all of their 2488 * deadlists (that was not born before their new origin). 2489 */ 2490 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2491 uint64_t space; 2492 2493 /* 2494 * Note, typically this will not be a clone of a clone, 2495 * so dd_origin_txg will be < TXG_INITIAL, so 2496 * these snaplist_space() -> dsl_deadlist_space_range() 2497 * calls will be fast because they do not have to 2498 * iterate over all bps. 2499 */ 2500 snap = list_head(&ddpa->origin_snaps); 2501 err = snaplist_space(&ddpa->shared_snaps, 2502 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2503 if (err != 0) 2504 goto out; 2505 2506 err = snaplist_space(&ddpa->clone_snaps, 2507 snap->ds->ds_dir->dd_origin_txg, &space); 2508 if (err != 0) 2509 goto out; 2510 ddpa->cloneusedsnap += space; 2511 } 2512 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2513 DD_FLAG_USED_BREAKDOWN) { 2514 err = snaplist_space(&ddpa->origin_snaps, 2515 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2516 &ddpa->originusedsnap); 2517 if (err != 0) 2518 goto out; 2519 } 2520 2521out: 2522 promote_rele(ddpa, FTAG); 2523 return (err); 2524} 2525 2526static void 2527dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2528{ 2529 dsl_dataset_promote_arg_t *ddpa = arg; 2530 dsl_pool_t *dp = dmu_tx_pool(tx); 2531 dsl_dataset_t *hds; 2532 struct promotenode *snap; 2533 dsl_dataset_t *origin_ds; 2534 dsl_dataset_t *origin_head; 2535 dsl_dir_t *dd; 2536 dsl_dir_t *odd = NULL; 2537 uint64_t oldnext_obj; 2538 int64_t delta; 2539#if defined(__FreeBSD__) && defined(_KERNEL) 2540 char *oldname, *newname; 2541#endif 2542 2543 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2544 hds = ddpa->ddpa_clone; 2545 2546 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2547 2548 snap = list_head(&ddpa->shared_snaps); 2549 origin_ds = snap->ds; 2550 dd = hds->ds_dir; 2551 2552 snap = list_head(&ddpa->origin_snaps); 2553 origin_head = snap->ds; 2554 2555 /* 2556 * We need to explicitly open odd, since origin_ds's dd will be 2557 * changing. 2558 */ 2559 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2560 NULL, FTAG, &odd)); 2561 2562 /* change origin's next snap */ 2563 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2564 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2565 snap = list_tail(&ddpa->clone_snaps); 2566 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2567 origin_ds->ds_object); 2568 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2569 2570 /* change the origin's next clone */ 2571 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2572 dsl_dataset_remove_from_next_clones(origin_ds, 2573 snap->ds->ds_object, tx); 2574 VERIFY0(zap_add_int(dp->dp_meta_objset, 2575 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2576 oldnext_obj, tx)); 2577 } 2578 2579 /* change origin */ 2580 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2581 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2582 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2583 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2584 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2585 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2586 origin_head->ds_dir->dd_origin_txg = 2587 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2588 2589 /* change dd_clone entries */ 2590 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2591 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2592 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2593 VERIFY0(zap_add_int(dp->dp_meta_objset, 2594 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2595 hds->ds_object, tx)); 2596 2597 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2598 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2599 origin_head->ds_object, tx)); 2600 if (dsl_dir_phys(dd)->dd_clones == 0) { 2601 dsl_dir_phys(dd)->dd_clones = 2602 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2603 DMU_OT_NONE, 0, tx); 2604 } 2605 VERIFY0(zap_add_int(dp->dp_meta_objset, 2606 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2607 } 2608 2609#if defined(__FreeBSD__) && defined(_KERNEL) 2610 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2611 mutex_enter(&spa_namespace_lock); 2612 2613 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2614 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2615#endif 2616 2617 /* move snapshots to this dir */ 2618 for (snap = list_head(&ddpa->shared_snaps); snap; 2619 snap = list_next(&ddpa->shared_snaps, snap)) { 2620 dsl_dataset_t *ds = snap->ds; 2621 2622 /* 2623 * Property callbacks are registered to a particular 2624 * dsl_dir. Since ours is changing, evict the objset 2625 * so that they will be unregistered from the old dsl_dir. 2626 */ 2627 if (ds->ds_objset) { 2628 dmu_objset_evict(ds->ds_objset); 2629 ds->ds_objset = NULL; 2630 } 2631 2632 /* move snap name entry */ 2633 VERIFY0(dsl_dataset_get_snapname(ds)); 2634 VERIFY0(dsl_dataset_snap_remove(origin_head, 2635 ds->ds_snapname, tx, B_TRUE)); 2636 VERIFY0(zap_add(dp->dp_meta_objset, 2637 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2638 8, 1, &ds->ds_object, tx)); 2639 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2640 DD_FIELD_SNAPSHOT_COUNT, tx); 2641 2642 /* change containing dsl_dir */ 2643 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2644 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2645 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2646 ASSERT3P(ds->ds_dir, ==, odd); 2647 dsl_dir_rele(ds->ds_dir, ds); 2648 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2649 NULL, ds, &ds->ds_dir)); 2650 2651#if defined(__FreeBSD__) && defined(_KERNEL) 2652 dsl_dataset_name(ds, newname); 2653 zfsvfs_update_fromname(oldname, newname); 2654 zvol_rename_minors(oldname, newname); 2655#endif 2656 2657 /* move any clone references */ 2658 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2659 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2660 zap_cursor_t zc; 2661 zap_attribute_t za; 2662 2663 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2664 dsl_dataset_phys(ds)->ds_next_clones_obj); 2665 zap_cursor_retrieve(&zc, &za) == 0; 2666 zap_cursor_advance(&zc)) { 2667 dsl_dataset_t *cnds; 2668 uint64_t o; 2669 2670 if (za.za_first_integer == oldnext_obj) { 2671 /* 2672 * We've already moved the 2673 * origin's reference. 2674 */ 2675 continue; 2676 } 2677 2678 VERIFY0(dsl_dataset_hold_obj(dp, 2679 za.za_first_integer, FTAG, &cnds)); 2680 o = dsl_dir_phys(cnds->ds_dir)-> 2681 dd_head_dataset_obj; 2682 2683 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2684 dsl_dir_phys(odd)->dd_clones, o, tx)); 2685 VERIFY0(zap_add_int(dp->dp_meta_objset, 2686 dsl_dir_phys(dd)->dd_clones, o, tx)); 2687 dsl_dataset_rele(cnds, FTAG); 2688 } 2689 zap_cursor_fini(&zc); 2690 } 2691 2692 ASSERT(!dsl_prop_hascb(ds)); 2693 } 2694 2695#if defined(__FreeBSD__) && defined(_KERNEL) 2696 mutex_exit(&spa_namespace_lock); 2697 2698 kmem_free(newname, MAXPATHLEN); 2699 kmem_free(oldname, MAXPATHLEN); 2700#endif 2701 /* 2702 * Change space accounting. 2703 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2704 * both be valid, or both be 0 (resulting in delta == 0). This 2705 * is true for each of {clone,origin} independently. 2706 */ 2707 2708 delta = ddpa->cloneusedsnap - 2709 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2710 ASSERT3S(delta, >=, 0); 2711 ASSERT3U(ddpa->used, >=, delta); 2712 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2713 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2714 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2715 2716 delta = ddpa->originusedsnap - 2717 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2718 ASSERT3S(delta, <=, 0); 2719 ASSERT3U(ddpa->used, >=, -delta); 2720 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2721 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2722 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2723 2724 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2725 2726 /* log history record */ 2727 spa_history_log_internal_ds(hds, "promote", tx, ""); 2728 2729 dsl_dir_rele(odd, FTAG); 2730 promote_rele(ddpa, FTAG); 2731} 2732 2733/* 2734 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2735 * (exclusive) and last_obj (inclusive). The list will be in reverse 2736 * order (last_obj will be the list_head()). If first_obj == 0, do all 2737 * snapshots back to this dataset's origin. 2738 */ 2739static int 2740snaplist_make(dsl_pool_t *dp, 2741 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2742{ 2743 uint64_t obj = last_obj; 2744 2745 list_create(l, sizeof (struct promotenode), 2746 offsetof(struct promotenode, link)); 2747 2748 while (obj != first_obj) { 2749 dsl_dataset_t *ds; 2750 struct promotenode *snap; 2751 int err; 2752 2753 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2754 ASSERT(err != ENOENT); 2755 if (err != 0) 2756 return (err); 2757 2758 if (first_obj == 0) 2759 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2760 2761 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2762 snap->ds = ds; 2763 list_insert_tail(l, snap); 2764 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2765 } 2766 2767 return (0); 2768} 2769 2770static int 2771snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2772{ 2773 struct promotenode *snap; 2774 2775 *spacep = 0; 2776 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2777 uint64_t used, comp, uncomp; 2778 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2779 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2780 *spacep += used; 2781 } 2782 return (0); 2783} 2784 2785static void 2786snaplist_destroy(list_t *l, void *tag) 2787{ 2788 struct promotenode *snap; 2789 2790 if (l == NULL || !list_link_active(&l->list_head)) 2791 return; 2792 2793 while ((snap = list_tail(l)) != NULL) { 2794 list_remove(l, snap); 2795 dsl_dataset_rele(snap->ds, tag); 2796 kmem_free(snap, sizeof (*snap)); 2797 } 2798 list_destroy(l); 2799} 2800 2801static int 2802promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2803{ 2804 int error; 2805 dsl_dir_t *dd; 2806 struct promotenode *snap; 2807 2808 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2809 &ddpa->ddpa_clone); 2810 if (error != 0) 2811 return (error); 2812 dd = ddpa->ddpa_clone->ds_dir; 2813 2814 if (ddpa->ddpa_clone->ds_is_snapshot || 2815 !dsl_dir_is_clone(dd)) { 2816 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2817 return (SET_ERROR(EINVAL)); 2818 } 2819 2820 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2821 &ddpa->shared_snaps, tag); 2822 if (error != 0) 2823 goto out; 2824 2825 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2826 &ddpa->clone_snaps, tag); 2827 if (error != 0) 2828 goto out; 2829 2830 snap = list_head(&ddpa->shared_snaps); 2831 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2832 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2833 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2834 &ddpa->origin_snaps, tag); 2835 if (error != 0) 2836 goto out; 2837 2838 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2839 error = dsl_dataset_hold_obj(dp, 2840 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2841 tag, &ddpa->origin_origin); 2842 if (error != 0) 2843 goto out; 2844 } 2845out: 2846 if (error != 0) 2847 promote_rele(ddpa, tag); 2848 return (error); 2849} 2850 2851static void 2852promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2853{ 2854 snaplist_destroy(&ddpa->shared_snaps, tag); 2855 snaplist_destroy(&ddpa->clone_snaps, tag); 2856 snaplist_destroy(&ddpa->origin_snaps, tag); 2857 if (ddpa->origin_origin != NULL) 2858 dsl_dataset_rele(ddpa->origin_origin, tag); 2859 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2860} 2861 2862/* 2863 * Promote a clone. 2864 * 2865 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2866 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2867 */ 2868int 2869dsl_dataset_promote(const char *name, char *conflsnap) 2870{ 2871 dsl_dataset_promote_arg_t ddpa = { 0 }; 2872 uint64_t numsnaps; 2873 int error; 2874 objset_t *os; 2875 2876 /* 2877 * We will modify space proportional to the number of 2878 * snapshots. Compute numsnaps. 2879 */ 2880 error = dmu_objset_hold(name, FTAG, &os); 2881 if (error != 0) 2882 return (error); 2883 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2884 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2885 &numsnaps); 2886 dmu_objset_rele(os, FTAG); 2887 if (error != 0) 2888 return (error); 2889 2890 ddpa.ddpa_clonename = name; 2891 ddpa.err_ds = conflsnap; 2892 ddpa.cr = CRED(); 2893 2894 return (dsl_sync_task(name, dsl_dataset_promote_check, 2895 dsl_dataset_promote_sync, &ddpa, 2896 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2897} 2898 2899int 2900dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2901 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2902{ 2903 /* 2904 * "slack" factor for received datasets with refquota set on them. 2905 * See the bottom of this function for details on its use. 2906 */ 2907 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 2908 int64_t unused_refres_delta; 2909 2910 /* they should both be heads */ 2911 if (clone->ds_is_snapshot || 2912 origin_head->ds_is_snapshot) 2913 return (SET_ERROR(EINVAL)); 2914 2915 /* if we are not forcing, the branch point should be just before them */ 2916 if (!force && clone->ds_prev != origin_head->ds_prev) 2917 return (SET_ERROR(EINVAL)); 2918 2919 /* clone should be the clone (unless they are unrelated) */ 2920 if (clone->ds_prev != NULL && 2921 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2922 origin_head->ds_dir != clone->ds_prev->ds_dir) 2923 return (SET_ERROR(EINVAL)); 2924 2925 /* the clone should be a child of the origin */ 2926 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2927 return (SET_ERROR(EINVAL)); 2928 2929 /* origin_head shouldn't be modified unless 'force' */ 2930 if (!force && 2931 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2932 return (SET_ERROR(ETXTBSY)); 2933 2934 /* origin_head should have no long holds (e.g. is not mounted) */ 2935 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2936 return (SET_ERROR(EBUSY)); 2937 2938 /* check amount of any unconsumed refreservation */ 2939 unused_refres_delta = 2940 (int64_t)MIN(origin_head->ds_reserved, 2941 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2942 (int64_t)MIN(origin_head->ds_reserved, 2943 dsl_dataset_phys(clone)->ds_unique_bytes); 2944 2945 if (unused_refres_delta > 0 && 2946 unused_refres_delta > 2947 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2948 return (SET_ERROR(ENOSPC)); 2949 2950 /* 2951 * The clone can't be too much over the head's refquota. 2952 * 2953 * To ensure that the entire refquota can be used, we allow one 2954 * transaction to exceed the the refquota. Therefore, this check 2955 * needs to also allow for the space referenced to be more than the 2956 * refquota. The maximum amount of space that one transaction can use 2957 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 2958 * overage ensures that we are able to receive a filesystem that 2959 * exceeds the refquota on the source system. 2960 * 2961 * So that overage is the refquota_slack we use below. 2962 */ 2963 if (origin_head->ds_quota != 0 && 2964 dsl_dataset_phys(clone)->ds_referenced_bytes > 2965 origin_head->ds_quota + refquota_slack) 2966 return (SET_ERROR(EDQUOT)); 2967 2968 return (0); 2969} 2970 2971void 2972dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2973 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2974{ 2975 dsl_pool_t *dp = dmu_tx_pool(tx); 2976 int64_t unused_refres_delta; 2977 2978 ASSERT(clone->ds_reserved == 0); 2979 /* 2980 * NOTE: On DEBUG kernels there could be a race between this and 2981 * the check function if spa_asize_inflation is adjusted... 2982 */ 2983 ASSERT(origin_head->ds_quota == 0 || 2984 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 2985 DMU_MAX_ACCESS * spa_asize_inflation); 2986 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2987 2988 /* 2989 * Swap per-dataset feature flags. 2990 */ 2991 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2992 if (!(spa_feature_table[f].fi_flags & 2993 ZFEATURE_FLAG_PER_DATASET)) { 2994 ASSERT(!clone->ds_feature_inuse[f]); 2995 ASSERT(!origin_head->ds_feature_inuse[f]); 2996 continue; 2997 } 2998 2999 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3000 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3001 3002 if (clone_inuse) { 3003 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3004 clone->ds_feature_inuse[f] = B_FALSE; 3005 } 3006 if (origin_head_inuse) { 3007 dsl_dataset_deactivate_feature(origin_head->ds_object, 3008 f, tx); 3009 origin_head->ds_feature_inuse[f] = B_FALSE; 3010 } 3011 if (clone_inuse) { 3012 dsl_dataset_activate_feature(origin_head->ds_object, 3013 f, tx); 3014 origin_head->ds_feature_inuse[f] = B_TRUE; 3015 } 3016 if (origin_head_inuse) { 3017 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3018 clone->ds_feature_inuse[f] = B_TRUE; 3019 } 3020 } 3021 3022 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3023 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3024 3025 if (clone->ds_objset != NULL) { 3026 dmu_objset_evict(clone->ds_objset); 3027 clone->ds_objset = NULL; 3028 } 3029 3030 if (origin_head->ds_objset != NULL) { 3031 dmu_objset_evict(origin_head->ds_objset); 3032 origin_head->ds_objset = NULL; 3033 } 3034 3035 unused_refres_delta = 3036 (int64_t)MIN(origin_head->ds_reserved, 3037 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3038 (int64_t)MIN(origin_head->ds_reserved, 3039 dsl_dataset_phys(clone)->ds_unique_bytes); 3040 3041 /* 3042 * Reset origin's unique bytes, if it exists. 3043 */ 3044 if (clone->ds_prev) { 3045 dsl_dataset_t *origin = clone->ds_prev; 3046 uint64_t comp, uncomp; 3047 3048 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3049 dsl_deadlist_space_range(&clone->ds_deadlist, 3050 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3051 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3052 } 3053 3054 /* swap blkptrs */ 3055 { 3056 blkptr_t tmp; 3057 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3058 dsl_dataset_phys(origin_head)->ds_bp = 3059 dsl_dataset_phys(clone)->ds_bp; 3060 dsl_dataset_phys(clone)->ds_bp = tmp; 3061 } 3062 3063 /* set dd_*_bytes */ 3064 { 3065 int64_t dused, dcomp, duncomp; 3066 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3067 uint64_t odl_used, odl_comp, odl_uncomp; 3068 3069 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3070 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3071 3072 dsl_deadlist_space(&clone->ds_deadlist, 3073 &cdl_used, &cdl_comp, &cdl_uncomp); 3074 dsl_deadlist_space(&origin_head->ds_deadlist, 3075 &odl_used, &odl_comp, &odl_uncomp); 3076 3077 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3078 cdl_used - 3079 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3080 odl_used); 3081 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3082 cdl_comp - 3083 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3084 odl_comp); 3085 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3086 cdl_uncomp - 3087 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3088 odl_uncomp); 3089 3090 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3091 dused, dcomp, duncomp, tx); 3092 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3093 -dused, -dcomp, -duncomp, tx); 3094 3095 /* 3096 * The difference in the space used by snapshots is the 3097 * difference in snapshot space due to the head's 3098 * deadlist (since that's the only thing that's 3099 * changing that affects the snapused). 3100 */ 3101 dsl_deadlist_space_range(&clone->ds_deadlist, 3102 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3103 &cdl_used, &cdl_comp, &cdl_uncomp); 3104 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3105 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3106 &odl_used, &odl_comp, &odl_uncomp); 3107 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3108 DD_USED_HEAD, DD_USED_SNAP, NULL); 3109 } 3110 3111 /* swap ds_*_bytes */ 3112 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3113 dsl_dataset_phys(clone)->ds_referenced_bytes); 3114 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3115 dsl_dataset_phys(clone)->ds_compressed_bytes); 3116 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3117 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3118 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3119 dsl_dataset_phys(clone)->ds_unique_bytes); 3120 3121 /* apply any parent delta for change in unconsumed refreservation */ 3122 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3123 unused_refres_delta, 0, 0, tx); 3124 3125 /* 3126 * Swap deadlists. 3127 */ 3128 dsl_deadlist_close(&clone->ds_deadlist); 3129 dsl_deadlist_close(&origin_head->ds_deadlist); 3130 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3131 dsl_dataset_phys(clone)->ds_deadlist_obj); 3132 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3133 dsl_dataset_phys(clone)->ds_deadlist_obj); 3134 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3135 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3136 3137 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3138 3139 spa_history_log_internal_ds(clone, "clone swap", tx, 3140 "parent=%s", origin_head->ds_dir->dd_myname); 3141} 3142 3143/* 3144 * Given a pool name and a dataset object number in that pool, 3145 * return the name of that dataset. 3146 */ 3147int 3148dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3149{ 3150 dsl_pool_t *dp; 3151 dsl_dataset_t *ds; 3152 int error; 3153 3154 error = dsl_pool_hold(pname, FTAG, &dp); 3155 if (error != 0) 3156 return (error); 3157 3158 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3159 if (error == 0) { 3160 dsl_dataset_name(ds, buf); 3161 dsl_dataset_rele(ds, FTAG); 3162 } 3163 dsl_pool_rele(dp, FTAG); 3164 3165 return (error); 3166} 3167 3168int 3169dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3170 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3171{ 3172 int error = 0; 3173 3174 ASSERT3S(asize, >, 0); 3175 3176 /* 3177 * *ref_rsrv is the portion of asize that will come from any 3178 * unconsumed refreservation space. 3179 */ 3180 *ref_rsrv = 0; 3181 3182 mutex_enter(&ds->ds_lock); 3183 /* 3184 * Make a space adjustment for reserved bytes. 3185 */ 3186 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3187 ASSERT3U(*used, >=, 3188 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3189 *used -= 3190 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3191 *ref_rsrv = 3192 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3193 } 3194 3195 if (!check_quota || ds->ds_quota == 0) { 3196 mutex_exit(&ds->ds_lock); 3197 return (0); 3198 } 3199 /* 3200 * If they are requesting more space, and our current estimate 3201 * is over quota, they get to try again unless the actual 3202 * on-disk is over quota and there are no pending changes (which 3203 * may free up space for us). 3204 */ 3205 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3206 ds->ds_quota) { 3207 if (inflight > 0 || 3208 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3209 error = SET_ERROR(ERESTART); 3210 else 3211 error = SET_ERROR(EDQUOT); 3212 } 3213 mutex_exit(&ds->ds_lock); 3214 3215 return (error); 3216} 3217 3218typedef struct dsl_dataset_set_qr_arg { 3219 const char *ddsqra_name; 3220 zprop_source_t ddsqra_source; 3221 uint64_t ddsqra_value; 3222} dsl_dataset_set_qr_arg_t; 3223 3224 3225/* ARGSUSED */ 3226static int 3227dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3228{ 3229 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3230 dsl_pool_t *dp = dmu_tx_pool(tx); 3231 dsl_dataset_t *ds; 3232 int error; 3233 uint64_t newval; 3234 3235 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3236 return (SET_ERROR(ENOTSUP)); 3237 3238 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3239 if (error != 0) 3240 return (error); 3241 3242 if (ds->ds_is_snapshot) { 3243 dsl_dataset_rele(ds, FTAG); 3244 return (SET_ERROR(EINVAL)); 3245 } 3246 3247 error = dsl_prop_predict(ds->ds_dir, 3248 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3249 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3250 if (error != 0) { 3251 dsl_dataset_rele(ds, FTAG); 3252 return (error); 3253 } 3254 3255 if (newval == 0) { 3256 dsl_dataset_rele(ds, FTAG); 3257 return (0); 3258 } 3259 3260 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3261 newval < ds->ds_reserved) { 3262 dsl_dataset_rele(ds, FTAG); 3263 return (SET_ERROR(ENOSPC)); 3264 } 3265 3266 dsl_dataset_rele(ds, FTAG); 3267 return (0); 3268} 3269 3270static void 3271dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3272{ 3273 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3274 dsl_pool_t *dp = dmu_tx_pool(tx); 3275 dsl_dataset_t *ds; 3276 uint64_t newval; 3277 3278 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3279 3280 dsl_prop_set_sync_impl(ds, 3281 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3282 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3283 &ddsqra->ddsqra_value, tx); 3284 3285 VERIFY0(dsl_prop_get_int_ds(ds, 3286 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3287 3288 if (ds->ds_quota != newval) { 3289 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3290 ds->ds_quota = newval; 3291 } 3292 dsl_dataset_rele(ds, FTAG); 3293} 3294 3295int 3296dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3297 uint64_t refquota) 3298{ 3299 dsl_dataset_set_qr_arg_t ddsqra; 3300 3301 ddsqra.ddsqra_name = dsname; 3302 ddsqra.ddsqra_source = source; 3303 ddsqra.ddsqra_value = refquota; 3304 3305 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3306 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3307} 3308 3309static int 3310dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3311{ 3312 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3313 dsl_pool_t *dp = dmu_tx_pool(tx); 3314 dsl_dataset_t *ds; 3315 int error; 3316 uint64_t newval, unique; 3317 3318 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3319 return (SET_ERROR(ENOTSUP)); 3320 3321 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3322 if (error != 0) 3323 return (error); 3324 3325 if (ds->ds_is_snapshot) { 3326 dsl_dataset_rele(ds, FTAG); 3327 return (SET_ERROR(EINVAL)); 3328 } 3329 3330 error = dsl_prop_predict(ds->ds_dir, 3331 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3332 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3333 if (error != 0) { 3334 dsl_dataset_rele(ds, FTAG); 3335 return (error); 3336 } 3337 3338 /* 3339 * If we are doing the preliminary check in open context, the 3340 * space estimates may be inaccurate. 3341 */ 3342 if (!dmu_tx_is_syncing(tx)) { 3343 dsl_dataset_rele(ds, FTAG); 3344 return (0); 3345 } 3346 3347 mutex_enter(&ds->ds_lock); 3348 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3349 dsl_dataset_recalc_head_uniq(ds); 3350 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3351 mutex_exit(&ds->ds_lock); 3352 3353 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3354 uint64_t delta = MAX(unique, newval) - 3355 MAX(unique, ds->ds_reserved); 3356 3357 if (delta > 3358 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3359 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3360 dsl_dataset_rele(ds, FTAG); 3361 return (SET_ERROR(ENOSPC)); 3362 } 3363 } 3364 3365 dsl_dataset_rele(ds, FTAG); 3366 return (0); 3367} 3368 3369void 3370dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3371 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3372{ 3373 uint64_t newval; 3374 uint64_t unique; 3375 int64_t delta; 3376 3377 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3378 source, sizeof (value), 1, &value, tx); 3379 3380 VERIFY0(dsl_prop_get_int_ds(ds, 3381 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3382 3383 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3384 mutex_enter(&ds->ds_dir->dd_lock); 3385 mutex_enter(&ds->ds_lock); 3386 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3387 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3388 delta = MAX(0, (int64_t)(newval - unique)) - 3389 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3390 ds->ds_reserved = newval; 3391 mutex_exit(&ds->ds_lock); 3392 3393 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3394 mutex_exit(&ds->ds_dir->dd_lock); 3395} 3396 3397static void 3398dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3399{ 3400 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3401 dsl_pool_t *dp = dmu_tx_pool(tx); 3402 dsl_dataset_t *ds; 3403 3404 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3405 dsl_dataset_set_refreservation_sync_impl(ds, 3406 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3407 dsl_dataset_rele(ds, FTAG); 3408} 3409 3410int 3411dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3412 uint64_t refreservation) 3413{ 3414 dsl_dataset_set_qr_arg_t ddsqra; 3415 3416 ddsqra.ddsqra_name = dsname; 3417 ddsqra.ddsqra_source = source; 3418 ddsqra.ddsqra_value = refreservation; 3419 3420 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3421 dsl_dataset_set_refreservation_sync, &ddsqra, 3422 0, ZFS_SPACE_CHECK_NONE)); 3423} 3424 3425/* 3426 * Return (in *usedp) the amount of space written in new that is not 3427 * present in oldsnap. New may be a snapshot or the head. Old must be 3428 * a snapshot before new, in new's filesystem (or its origin). If not then 3429 * fail and return EINVAL. 3430 * 3431 * The written space is calculated by considering two components: First, we 3432 * ignore any freed space, and calculate the written as new's used space 3433 * minus old's used space. Next, we add in the amount of space that was freed 3434 * between the two snapshots, thus reducing new's used space relative to old's. 3435 * Specifically, this is the space that was born before old->ds_creation_txg, 3436 * and freed before new (ie. on new's deadlist or a previous deadlist). 3437 * 3438 * space freed [---------------------] 3439 * snapshots ---O-------O--------O-------O------ 3440 * oldsnap new 3441 */ 3442int 3443dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3444 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3445{ 3446 int err = 0; 3447 uint64_t snapobj; 3448 dsl_pool_t *dp = new->ds_dir->dd_pool; 3449 3450 ASSERT(dsl_pool_config_held(dp)); 3451 3452 *usedp = 0; 3453 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3454 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3455 3456 *compp = 0; 3457 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3458 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3459 3460 *uncompp = 0; 3461 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3462 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3463 3464 snapobj = new->ds_object; 3465 while (snapobj != oldsnap->ds_object) { 3466 dsl_dataset_t *snap; 3467 uint64_t used, comp, uncomp; 3468 3469 if (snapobj == new->ds_object) { 3470 snap = new; 3471 } else { 3472 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3473 if (err != 0) 3474 break; 3475 } 3476 3477 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3478 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3479 /* 3480 * The blocks in the deadlist can not be born after 3481 * ds_prev_snap_txg, so get the whole deadlist space, 3482 * which is more efficient (especially for old-format 3483 * deadlists). Unfortunately the deadlist code 3484 * doesn't have enough information to make this 3485 * optimization itself. 3486 */ 3487 dsl_deadlist_space(&snap->ds_deadlist, 3488 &used, &comp, &uncomp); 3489 } else { 3490 dsl_deadlist_space_range(&snap->ds_deadlist, 3491 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3492 &used, &comp, &uncomp); 3493 } 3494 *usedp += used; 3495 *compp += comp; 3496 *uncompp += uncomp; 3497 3498 /* 3499 * If we get to the beginning of the chain of snapshots 3500 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3501 * was not a snapshot of/before new. 3502 */ 3503 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3504 if (snap != new) 3505 dsl_dataset_rele(snap, FTAG); 3506 if (snapobj == 0) { 3507 err = SET_ERROR(EINVAL); 3508 break; 3509 } 3510 3511 } 3512 return (err); 3513} 3514 3515/* 3516 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3517 * lastsnap, and all snapshots in between are deleted. 3518 * 3519 * blocks that would be freed [---------------------------] 3520 * snapshots ---O-------O--------O-------O--------O 3521 * firstsnap lastsnap 3522 * 3523 * This is the set of blocks that were born after the snap before firstsnap, 3524 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3525 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3526 * We calculate this by iterating over the relevant deadlists (from the snap 3527 * after lastsnap, backward to the snap after firstsnap), summing up the 3528 * space on the deadlist that was born after the snap before firstsnap. 3529 */ 3530int 3531dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3532 dsl_dataset_t *lastsnap, 3533 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3534{ 3535 int err = 0; 3536 uint64_t snapobj; 3537 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3538 3539 ASSERT(firstsnap->ds_is_snapshot); 3540 ASSERT(lastsnap->ds_is_snapshot); 3541 3542 /* 3543 * Check that the snapshots are in the same dsl_dir, and firstsnap 3544 * is before lastsnap. 3545 */ 3546 if (firstsnap->ds_dir != lastsnap->ds_dir || 3547 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3548 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3549 return (SET_ERROR(EINVAL)); 3550 3551 *usedp = *compp = *uncompp = 0; 3552 3553 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3554 while (snapobj != firstsnap->ds_object) { 3555 dsl_dataset_t *ds; 3556 uint64_t used, comp, uncomp; 3557 3558 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3559 if (err != 0) 3560 break; 3561 3562 dsl_deadlist_space_range(&ds->ds_deadlist, 3563 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3564 &used, &comp, &uncomp); 3565 *usedp += used; 3566 *compp += comp; 3567 *uncompp += uncomp; 3568 3569 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3570 ASSERT3U(snapobj, !=, 0); 3571 dsl_dataset_rele(ds, FTAG); 3572 } 3573 return (err); 3574} 3575 3576/* 3577 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3578 * For example, they could both be snapshots of the same filesystem, and 3579 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3580 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3581 * filesystem. Or 'earlier' could be the origin's origin. 3582 * 3583 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3584 */ 3585boolean_t 3586dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3587 uint64_t earlier_txg) 3588{ 3589 dsl_pool_t *dp = later->ds_dir->dd_pool; 3590 int error; 3591 boolean_t ret; 3592 3593 ASSERT(dsl_pool_config_held(dp)); 3594 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3595 3596 if (earlier_txg == 0) 3597 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3598 3599 if (later->ds_is_snapshot && 3600 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3601 return (B_FALSE); 3602 3603 if (later->ds_dir == earlier->ds_dir) 3604 return (B_TRUE); 3605 if (!dsl_dir_is_clone(later->ds_dir)) 3606 return (B_FALSE); 3607 3608 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3609 return (B_TRUE); 3610 dsl_dataset_t *origin; 3611 error = dsl_dataset_hold_obj(dp, 3612 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3613 if (error != 0) 3614 return (B_FALSE); 3615 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3616 dsl_dataset_rele(origin, FTAG); 3617 return (ret); 3618} 3619 3620void 3621dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3622{ 3623 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3624 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3625} 3626 3627boolean_t 3628dsl_dataset_is_zapified(dsl_dataset_t *ds) 3629{ 3630 dmu_object_info_t doi; 3631 3632 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3633 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3634} 3635 3636boolean_t 3637dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3638{ 3639 return (dsl_dataset_is_zapified(ds) && 3640 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3641 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3642} 3643