dsl_dataset.c revision 310512
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 91static zil_header_t zero_zil; 92 93/* 94 * Figure out how much of this delta should be propogated to the dsl_dir 95 * layer. If there's a refreservation, that space has already been 96 * partially accounted for in our ancestors. 97 */ 98static int64_t 99parent_delta(dsl_dataset_t *ds, int64_t delta) 100{ 101 dsl_dataset_phys_t *ds_phys; 102 uint64_t old_bytes, new_bytes; 103 104 if (ds->ds_reserved == 0) 105 return (delta); 106 107 ds_phys = dsl_dataset_phys(ds); 108 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 109 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 110 111 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 112 return (new_bytes - old_bytes); 113} 114 115void 116dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 117{ 118 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 119 int compressed = BP_GET_PSIZE(bp); 120 int uncompressed = BP_GET_UCSIZE(bp); 121 int64_t delta; 122 123 dprintf_bp(bp, "ds=%p", ds); 124 125 ASSERT(dmu_tx_is_syncing(tx)); 126 /* It could have been compressed away to nothing */ 127 if (BP_IS_HOLE(bp)) 128 return; 129 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 130 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 131 if (ds == NULL) { 132 dsl_pool_mos_diduse_space(tx->tx_pool, 133 used, compressed, uncompressed); 134 return; 135 } 136 137 ASSERT3U(bp->blk_birth, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 138 dmu_buf_will_dirty(ds->ds_dbuf, tx); 139 mutex_enter(&ds->ds_lock); 140 delta = parent_delta(ds, used); 141 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 142 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 143 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 144 dsl_dataset_phys(ds)->ds_unique_bytes += used; 145 146 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 147 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 148 B_TRUE; 149 } 150 151 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 152 if (f != SPA_FEATURE_NONE) 153 ds->ds_feature_activation_needed[f] = B_TRUE; 154 155 mutex_exit(&ds->ds_lock); 156 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 157 compressed, uncompressed, tx); 158 dsl_dir_transfer_space(ds->ds_dir, used - delta, 159 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 160} 161 162int 163dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 164 boolean_t async) 165{ 166 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 167 int compressed = BP_GET_PSIZE(bp); 168 int uncompressed = BP_GET_UCSIZE(bp); 169 170 if (BP_IS_HOLE(bp)) 171 return (0); 172 173 ASSERT(dmu_tx_is_syncing(tx)); 174 ASSERT(bp->blk_birth <= tx->tx_txg); 175 176 if (ds == NULL) { 177 dsl_free(tx->tx_pool, tx->tx_txg, bp); 178 dsl_pool_mos_diduse_space(tx->tx_pool, 179 -used, -compressed, -uncompressed); 180 return (used); 181 } 182 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 183 184 ASSERT(!ds->ds_is_snapshot); 185 dmu_buf_will_dirty(ds->ds_dbuf, tx); 186 187 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 188 int64_t delta; 189 190 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 191 dsl_free(tx->tx_pool, tx->tx_txg, bp); 192 193 mutex_enter(&ds->ds_lock); 194 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 195 !DS_UNIQUE_IS_ACCURATE(ds)); 196 delta = parent_delta(ds, -used); 197 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 198 mutex_exit(&ds->ds_lock); 199 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 200 delta, -compressed, -uncompressed, tx); 201 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 202 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 203 } else { 204 dprintf_bp(bp, "putting on dead list: %s", ""); 205 if (async) { 206 /* 207 * We are here as part of zio's write done callback, 208 * which means we're a zio interrupt thread. We can't 209 * call dsl_deadlist_insert() now because it may block 210 * waiting for I/O. Instead, put bp on the deferred 211 * queue and let dsl_pool_sync() finish the job. 212 */ 213 bplist_append(&ds->ds_pending_deadlist, bp); 214 } else { 215 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 216 } 217 ASSERT3U(ds->ds_prev->ds_object, ==, 218 dsl_dataset_phys(ds)->ds_prev_snap_obj); 219 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 220 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 221 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 222 ds->ds_object && bp->blk_birth > 223 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 224 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 225 mutex_enter(&ds->ds_prev->ds_lock); 226 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 227 mutex_exit(&ds->ds_prev->ds_lock); 228 } 229 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 230 dsl_dir_transfer_space(ds->ds_dir, used, 231 DD_USED_HEAD, DD_USED_SNAP, tx); 232 } 233 } 234 mutex_enter(&ds->ds_lock); 235 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 236 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 237 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 238 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 239 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 240 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 241 mutex_exit(&ds->ds_lock); 242 243 return (used); 244} 245 246uint64_t 247dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 248{ 249 uint64_t trysnap = 0; 250 251 if (ds == NULL) 252 return (0); 253 /* 254 * The snapshot creation could fail, but that would cause an 255 * incorrect FALSE return, which would only result in an 256 * overestimation of the amount of space that an operation would 257 * consume, which is OK. 258 * 259 * There's also a small window where we could miss a pending 260 * snapshot, because we could set the sync task in the quiescing 261 * phase. So this should only be used as a guess. 262 */ 263 if (ds->ds_trysnap_txg > 264 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 265 trysnap = ds->ds_trysnap_txg; 266 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 267} 268 269boolean_t 270dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 271 uint64_t blk_birth) 272{ 273 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 274 (bp != NULL && BP_IS_HOLE(bp))) 275 return (B_FALSE); 276 277 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 278 279 return (B_TRUE); 280} 281 282static void 283dsl_dataset_evict(void *dbu) 284{ 285 dsl_dataset_t *ds = dbu; 286 287 ASSERT(ds->ds_owner == NULL); 288 289 ds->ds_dbuf = NULL; 290 291 unique_remove(ds->ds_fsid_guid); 292 293 if (ds->ds_objset != NULL) 294 dmu_objset_evict(ds->ds_objset); 295 296 if (ds->ds_prev) { 297 dsl_dataset_rele(ds->ds_prev, ds); 298 ds->ds_prev = NULL; 299 } 300 301 bplist_destroy(&ds->ds_pending_deadlist); 302 if (ds->ds_deadlist.dl_os != NULL) 303 dsl_deadlist_close(&ds->ds_deadlist); 304 if (ds->ds_dir) 305 dsl_dir_async_rele(ds->ds_dir, ds); 306 307 ASSERT(!list_link_active(&ds->ds_synced_link)); 308 309 list_destroy(&ds->ds_prop_cbs); 310 if (mutex_owned(&ds->ds_lock)) 311 mutex_exit(&ds->ds_lock); 312 mutex_destroy(&ds->ds_lock); 313 if (mutex_owned(&ds->ds_opening_lock)) 314 mutex_exit(&ds->ds_opening_lock); 315 mutex_destroy(&ds->ds_opening_lock); 316 mutex_destroy(&ds->ds_sendstream_lock); 317 refcount_destroy(&ds->ds_longholds); 318 rrw_destroy(&ds->ds_bp_rwlock); 319 320 kmem_free(ds, sizeof (dsl_dataset_t)); 321} 322 323int 324dsl_dataset_get_snapname(dsl_dataset_t *ds) 325{ 326 dsl_dataset_phys_t *headphys; 327 int err; 328 dmu_buf_t *headdbuf; 329 dsl_pool_t *dp = ds->ds_dir->dd_pool; 330 objset_t *mos = dp->dp_meta_objset; 331 332 if (ds->ds_snapname[0]) 333 return (0); 334 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 335 return (0); 336 337 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 338 FTAG, &headdbuf); 339 if (err != 0) 340 return (err); 341 headphys = headdbuf->db_data; 342 err = zap_value_search(dp->dp_meta_objset, 343 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 344 dmu_buf_rele(headdbuf, FTAG); 345 return (err); 346} 347 348int 349dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 350{ 351 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 352 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 353 matchtype_t mt; 354 int err; 355 356 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 357 mt = MT_FIRST; 358 else 359 mt = MT_EXACT; 360 361 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 362 value, mt, NULL, 0, NULL); 363 if (err == ENOTSUP && mt == MT_FIRST) 364 err = zap_lookup(mos, snapobj, name, 8, 1, value); 365 return (err); 366} 367 368int 369dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 370 boolean_t adj_cnt) 371{ 372 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 373 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 374 matchtype_t mt; 375 int err; 376 377 dsl_dir_snap_cmtime_update(ds->ds_dir); 378 379 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 380 mt = MT_FIRST; 381 else 382 mt = MT_EXACT; 383 384 err = zap_remove_norm(mos, snapobj, name, mt, tx); 385 if (err == ENOTSUP && mt == MT_FIRST) 386 err = zap_remove(mos, snapobj, name, tx); 387 388 if (err == 0 && adj_cnt) 389 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 390 DD_FIELD_SNAPSHOT_COUNT, tx); 391 392 return (err); 393} 394 395boolean_t 396dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 397{ 398 dmu_buf_t *dbuf = ds->ds_dbuf; 399 boolean_t result = B_FALSE; 400 401 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 402 ds->ds_object, DMU_BONUS_BLKID, tag)) { 403 404 if (ds == dmu_buf_get_user(dbuf)) 405 result = B_TRUE; 406 else 407 dmu_buf_rele(dbuf, tag); 408 } 409 410 return (result); 411} 412 413int 414dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 415 dsl_dataset_t **dsp) 416{ 417 objset_t *mos = dp->dp_meta_objset; 418 dmu_buf_t *dbuf; 419 dsl_dataset_t *ds; 420 int err; 421 dmu_object_info_t doi; 422 423 ASSERT(dsl_pool_config_held(dp)); 424 425 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 426 if (err != 0) 427 return (err); 428 429 /* Make sure dsobj has the correct object type. */ 430 dmu_object_info_from_db(dbuf, &doi); 431 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 432 dmu_buf_rele(dbuf, tag); 433 return (SET_ERROR(EINVAL)); 434 } 435 436 ds = dmu_buf_get_user(dbuf); 437 if (ds == NULL) { 438 dsl_dataset_t *winner = NULL; 439 440 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 441 ds->ds_dbuf = dbuf; 442 ds->ds_object = dsobj; 443 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 444 445 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 446 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 447 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 448 rrw_init(&ds->ds_bp_rwlock, B_FALSE); 449 refcount_create(&ds->ds_longholds); 450 451 bplist_create(&ds->ds_pending_deadlist); 452 dsl_deadlist_open(&ds->ds_deadlist, 453 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 454 455 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 456 offsetof(dmu_sendarg_t, dsa_link)); 457 458 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 459 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 460 461 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 462 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 463 if (!(spa_feature_table[f].fi_flags & 464 ZFEATURE_FLAG_PER_DATASET)) 465 continue; 466 err = zap_contains(mos, dsobj, 467 spa_feature_table[f].fi_guid); 468 if (err == 0) { 469 ds->ds_feature_inuse[f] = B_TRUE; 470 } else { 471 ASSERT3U(err, ==, ENOENT); 472 err = 0; 473 } 474 } 475 } 476 477 err = dsl_dir_hold_obj(dp, 478 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 479 if (err != 0) { 480 mutex_destroy(&ds->ds_lock); 481 mutex_destroy(&ds->ds_opening_lock); 482 mutex_destroy(&ds->ds_sendstream_lock); 483 refcount_destroy(&ds->ds_longholds); 484 bplist_destroy(&ds->ds_pending_deadlist); 485 dsl_deadlist_close(&ds->ds_deadlist); 486 kmem_free(ds, sizeof (dsl_dataset_t)); 487 dmu_buf_rele(dbuf, tag); 488 return (err); 489 } 490 491 if (!ds->ds_is_snapshot) { 492 ds->ds_snapname[0] = '\0'; 493 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 494 err = dsl_dataset_hold_obj(dp, 495 dsl_dataset_phys(ds)->ds_prev_snap_obj, 496 ds, &ds->ds_prev); 497 } 498 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 499 int zaperr = zap_lookup(mos, ds->ds_object, 500 DS_FIELD_BOOKMARK_NAMES, 501 sizeof (ds->ds_bookmarks), 1, 502 &ds->ds_bookmarks); 503 if (zaperr != ENOENT) 504 VERIFY0(zaperr); 505 } 506 } else { 507 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 508 err = dsl_dataset_get_snapname(ds); 509 if (err == 0 && 510 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 511 err = zap_count( 512 ds->ds_dir->dd_pool->dp_meta_objset, 513 dsl_dataset_phys(ds)->ds_userrefs_obj, 514 &ds->ds_userrefs); 515 } 516 } 517 518 if (err == 0 && !ds->ds_is_snapshot) { 519 err = dsl_prop_get_int_ds(ds, 520 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 521 &ds->ds_reserved); 522 if (err == 0) { 523 err = dsl_prop_get_int_ds(ds, 524 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 525 &ds->ds_quota); 526 } 527 } else { 528 ds->ds_reserved = ds->ds_quota = 0; 529 } 530 531 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 532 if (err == 0) 533 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 534 535 if (err != 0 || winner != NULL) { 536 bplist_destroy(&ds->ds_pending_deadlist); 537 dsl_deadlist_close(&ds->ds_deadlist); 538 if (ds->ds_prev) 539 dsl_dataset_rele(ds->ds_prev, ds); 540 dsl_dir_rele(ds->ds_dir, ds); 541 mutex_destroy(&ds->ds_lock); 542 mutex_destroy(&ds->ds_opening_lock); 543 mutex_destroy(&ds->ds_sendstream_lock); 544 refcount_destroy(&ds->ds_longholds); 545 kmem_free(ds, sizeof (dsl_dataset_t)); 546 if (err != 0) { 547 dmu_buf_rele(dbuf, tag); 548 return (err); 549 } 550 ds = winner; 551 } else { 552 ds->ds_fsid_guid = 553 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 554 } 555 } 556 ASSERT3P(ds->ds_dbuf, ==, dbuf); 557 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 558 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 559 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 560 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 561 *dsp = ds; 562 return (0); 563} 564 565int 566dsl_dataset_hold(dsl_pool_t *dp, const char *name, 567 void *tag, dsl_dataset_t **dsp) 568{ 569 dsl_dir_t *dd; 570 const char *snapname; 571 uint64_t obj; 572 int err = 0; 573 dsl_dataset_t *ds; 574 575 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 576 if (err != 0) 577 return (err); 578 579 ASSERT(dsl_pool_config_held(dp)); 580 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 581 if (obj != 0) 582 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 583 else 584 err = SET_ERROR(ENOENT); 585 586 /* we may be looking for a snapshot */ 587 if (err == 0 && snapname != NULL) { 588 dsl_dataset_t *snap_ds; 589 590 if (*snapname++ != '@') { 591 dsl_dataset_rele(ds, tag); 592 dsl_dir_rele(dd, FTAG); 593 return (SET_ERROR(ENOENT)); 594 } 595 596 dprintf("looking for snapshot '%s'\n", snapname); 597 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 598 if (err == 0) 599 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 600 dsl_dataset_rele(ds, tag); 601 602 if (err == 0) { 603 mutex_enter(&snap_ds->ds_lock); 604 if (snap_ds->ds_snapname[0] == 0) 605 (void) strlcpy(snap_ds->ds_snapname, snapname, 606 sizeof (snap_ds->ds_snapname)); 607 mutex_exit(&snap_ds->ds_lock); 608 ds = snap_ds; 609 } 610 } 611 if (err == 0) 612 *dsp = ds; 613 dsl_dir_rele(dd, FTAG); 614 return (err); 615} 616 617int 618dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 619 void *tag, dsl_dataset_t **dsp) 620{ 621 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 622 if (err != 0) 623 return (err); 624 if (!dsl_dataset_tryown(*dsp, tag)) { 625 dsl_dataset_rele(*dsp, tag); 626 *dsp = NULL; 627 return (SET_ERROR(EBUSY)); 628 } 629 return (0); 630} 631 632int 633dsl_dataset_own(dsl_pool_t *dp, const char *name, 634 void *tag, dsl_dataset_t **dsp) 635{ 636 int err = dsl_dataset_hold(dp, name, tag, dsp); 637 if (err != 0) 638 return (err); 639 if (!dsl_dataset_tryown(*dsp, tag)) { 640 dsl_dataset_rele(*dsp, tag); 641 return (SET_ERROR(EBUSY)); 642 } 643 return (0); 644} 645 646/* 647 * See the comment above dsl_pool_hold() for details. In summary, a long 648 * hold is used to prevent destruction of a dataset while the pool hold 649 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 650 * 651 * The dataset and pool must be held when this function is called. After it 652 * is called, the pool hold may be released while the dataset is still held 653 * and accessed. 654 */ 655void 656dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 657{ 658 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 659 (void) refcount_add(&ds->ds_longholds, tag); 660} 661 662void 663dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 664{ 665 (void) refcount_remove(&ds->ds_longholds, tag); 666} 667 668/* Return B_TRUE if there are any long holds on this dataset. */ 669boolean_t 670dsl_dataset_long_held(dsl_dataset_t *ds) 671{ 672 return (!refcount_is_zero(&ds->ds_longholds)); 673} 674 675void 676dsl_dataset_name(dsl_dataset_t *ds, char *name) 677{ 678 if (ds == NULL) { 679 (void) strcpy(name, "mos"); 680 } else { 681 dsl_dir_name(ds->ds_dir, name); 682 VERIFY0(dsl_dataset_get_snapname(ds)); 683 if (ds->ds_snapname[0]) { 684 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 685 <, ZFS_MAX_DATASET_NAME_LEN); 686 /* 687 * We use a "recursive" mutex so that we 688 * can call dprintf_ds() with ds_lock held. 689 */ 690 if (!MUTEX_HELD(&ds->ds_lock)) { 691 mutex_enter(&ds->ds_lock); 692 VERIFY3U(strlcat(name, ds->ds_snapname, 693 ZFS_MAX_DATASET_NAME_LEN), <, 694 ZFS_MAX_DATASET_NAME_LEN); 695 mutex_exit(&ds->ds_lock); 696 } else { 697 VERIFY3U(strlcat(name, ds->ds_snapname, 698 ZFS_MAX_DATASET_NAME_LEN), <, 699 ZFS_MAX_DATASET_NAME_LEN); 700 } 701 } 702 } 703} 704 705int 706dsl_dataset_namelen(dsl_dataset_t *ds) 707{ 708 VERIFY0(dsl_dataset_get_snapname(ds)); 709 mutex_enter(&ds->ds_lock); 710 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 711 mutex_exit(&ds->ds_lock); 712 return (len); 713} 714 715void 716dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 717{ 718 dmu_buf_rele(ds->ds_dbuf, tag); 719} 720 721void 722dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 723{ 724 ASSERT3P(ds->ds_owner, ==, tag); 725 ASSERT(ds->ds_dbuf != NULL); 726 727 mutex_enter(&ds->ds_lock); 728 ds->ds_owner = NULL; 729 mutex_exit(&ds->ds_lock); 730 dsl_dataset_long_rele(ds, tag); 731 dsl_dataset_rele(ds, tag); 732} 733 734boolean_t 735dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 736{ 737 boolean_t gotit = FALSE; 738 739 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 740 mutex_enter(&ds->ds_lock); 741 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 742 ds->ds_owner = tag; 743 dsl_dataset_long_hold(ds, tag); 744 gotit = TRUE; 745 } 746 mutex_exit(&ds->ds_lock); 747 return (gotit); 748} 749 750boolean_t 751dsl_dataset_has_owner(dsl_dataset_t *ds) 752{ 753 boolean_t rv; 754 mutex_enter(&ds->ds_lock); 755 rv = (ds->ds_owner != NULL); 756 mutex_exit(&ds->ds_lock); 757 return (rv); 758} 759 760static void 761dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 762{ 763 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 764 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 765 uint64_t zero = 0; 766 767 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 768 769 spa_feature_incr(spa, f, tx); 770 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 771 772 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 773 sizeof (zero), 1, &zero, tx)); 774} 775 776void 777dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 778{ 779 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 780 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 781 782 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 783 784 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 785 spa_feature_decr(spa, f, tx); 786} 787 788uint64_t 789dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 790 uint64_t flags, dmu_tx_t *tx) 791{ 792 dsl_pool_t *dp = dd->dd_pool; 793 dmu_buf_t *dbuf; 794 dsl_dataset_phys_t *dsphys; 795 uint64_t dsobj; 796 objset_t *mos = dp->dp_meta_objset; 797 798 if (origin == NULL) 799 origin = dp->dp_origin_snap; 800 801 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 802 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 803 ASSERT(dmu_tx_is_syncing(tx)); 804 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 805 806 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 807 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 808 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 809 dmu_buf_will_dirty(dbuf, tx); 810 dsphys = dbuf->db_data; 811 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 812 dsphys->ds_dir_obj = dd->dd_object; 813 dsphys->ds_flags = flags; 814 dsphys->ds_fsid_guid = unique_create(); 815 do { 816 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 817 sizeof (dsphys->ds_guid)); 818 } while (dsphys->ds_guid == 0); 819 dsphys->ds_snapnames_zapobj = 820 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 821 DMU_OT_NONE, 0, tx); 822 dsphys->ds_creation_time = gethrestime_sec(); 823 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 824 825 if (origin == NULL) { 826 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 827 } else { 828 dsl_dataset_t *ohds; /* head of the origin snapshot */ 829 830 dsphys->ds_prev_snap_obj = origin->ds_object; 831 dsphys->ds_prev_snap_txg = 832 dsl_dataset_phys(origin)->ds_creation_txg; 833 dsphys->ds_referenced_bytes = 834 dsl_dataset_phys(origin)->ds_referenced_bytes; 835 dsphys->ds_compressed_bytes = 836 dsl_dataset_phys(origin)->ds_compressed_bytes; 837 dsphys->ds_uncompressed_bytes = 838 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 839 rrw_enter(&origin->ds_bp_rwlock, RW_READER, FTAG); 840 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 841 rrw_exit(&origin->ds_bp_rwlock, FTAG); 842 843 /* 844 * Inherit flags that describe the dataset's contents 845 * (INCONSISTENT) or properties (Case Insensitive). 846 */ 847 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 848 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 849 850 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 851 if (origin->ds_feature_inuse[f]) 852 dsl_dataset_activate_feature(dsobj, f, tx); 853 } 854 855 dmu_buf_will_dirty(origin->ds_dbuf, tx); 856 dsl_dataset_phys(origin)->ds_num_children++; 857 858 VERIFY0(dsl_dataset_hold_obj(dp, 859 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 860 FTAG, &ohds)); 861 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 862 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 863 dsl_dataset_rele(ohds, FTAG); 864 865 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 866 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 867 dsl_dataset_phys(origin)->ds_next_clones_obj = 868 zap_create(mos, 869 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 870 } 871 VERIFY0(zap_add_int(mos, 872 dsl_dataset_phys(origin)->ds_next_clones_obj, 873 dsobj, tx)); 874 } 875 876 dmu_buf_will_dirty(dd->dd_dbuf, tx); 877 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 878 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 879 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 880 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 881 dsl_dir_phys(origin->ds_dir)->dd_clones = 882 zap_create(mos, 883 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 884 } 885 VERIFY0(zap_add_int(mos, 886 dsl_dir_phys(origin->ds_dir)->dd_clones, 887 dsobj, tx)); 888 } 889 } 890 891 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 892 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 893 894 dmu_buf_rele(dbuf, FTAG); 895 896 dmu_buf_will_dirty(dd->dd_dbuf, tx); 897 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 898 899 return (dsobj); 900} 901 902static void 903dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 904{ 905 objset_t *os; 906 907 VERIFY0(dmu_objset_from_ds(ds, &os)); 908 if (bcmp(&os->os_zil_header, &zero_zil, sizeof (zero_zil)) != 0) { 909 dsl_pool_t *dp = ds->ds_dir->dd_pool; 910 zio_t *zio; 911 912 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 913 914 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 915 dsl_dataset_sync(ds, zio, tx); 916 VERIFY0(zio_wait(zio)); 917 918 /* dsl_dataset_sync_done will drop this reference. */ 919 dmu_buf_add_ref(ds->ds_dbuf, ds); 920 dsl_dataset_sync_done(ds, tx); 921 } 922} 923 924uint64_t 925dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 926 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 927{ 928 dsl_pool_t *dp = pdd->dd_pool; 929 uint64_t dsobj, ddobj; 930 dsl_dir_t *dd; 931 932 ASSERT(dmu_tx_is_syncing(tx)); 933 ASSERT(lastname[0] != '@'); 934 935 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 936 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 937 938 dsobj = dsl_dataset_create_sync_dd(dd, origin, 939 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 940 941 dsl_deleg_set_create_perms(dd, tx, cr); 942 943 /* 944 * Since we're creating a new node we know it's a leaf, so we can 945 * initialize the counts if the limit feature is active. 946 */ 947 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 948 uint64_t cnt = 0; 949 objset_t *os = dd->dd_pool->dp_meta_objset; 950 951 dsl_dir_zapify(dd, tx); 952 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 953 sizeof (cnt), 1, &cnt, tx)); 954 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 955 sizeof (cnt), 1, &cnt, tx)); 956 } 957 958 dsl_dir_rele(dd, FTAG); 959 960 /* 961 * If we are creating a clone, make sure we zero out any stale 962 * data from the origin snapshots zil header. 963 */ 964 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 965 dsl_dataset_t *ds; 966 967 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 968 dsl_dataset_zero_zil(ds, tx); 969 dsl_dataset_rele(ds, FTAG); 970 } 971 972 return (dsobj); 973} 974 975#ifdef __FreeBSD__ 976/* FreeBSD ioctl compat begin */ 977struct destroyarg { 978 nvlist_t *nvl; 979 const char *snapname; 980}; 981 982static int 983dsl_check_snap_cb(const char *name, void *arg) 984{ 985 struct destroyarg *da = arg; 986 dsl_dataset_t *ds; 987 char *dsname; 988 989 dsname = kmem_asprintf("%s@%s", name, da->snapname); 990 fnvlist_add_boolean(da->nvl, dsname); 991 kmem_free(dsname, strlen(dsname) + 1); 992 993 return (0); 994} 995 996int 997dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 998 nvlist_t *snaps) 999{ 1000 struct destroyarg *da; 1001 int err; 1002 1003 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 1004 da->nvl = snaps; 1005 da->snapname = snapname; 1006 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 1007 DS_FIND_CHILDREN); 1008 kmem_free(da, sizeof (struct destroyarg)); 1009 1010 return (err); 1011} 1012/* FreeBSD ioctl compat end */ 1013#endif /* __FreeBSD__ */ 1014 1015/* 1016 * The unique space in the head dataset can be calculated by subtracting 1017 * the space used in the most recent snapshot, that is still being used 1018 * in this file system, from the space currently in use. To figure out 1019 * the space in the most recent snapshot still in use, we need to take 1020 * the total space used in the snapshot and subtract out the space that 1021 * has been freed up since the snapshot was taken. 1022 */ 1023void 1024dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1025{ 1026 uint64_t mrs_used; 1027 uint64_t dlused, dlcomp, dluncomp; 1028 1029 ASSERT(!ds->ds_is_snapshot); 1030 1031 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1032 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1033 else 1034 mrs_used = 0; 1035 1036 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1037 1038 ASSERT3U(dlused, <=, mrs_used); 1039 dsl_dataset_phys(ds)->ds_unique_bytes = 1040 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1041 1042 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1043 SPA_VERSION_UNIQUE_ACCURATE) 1044 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1045} 1046 1047void 1048dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1049 dmu_tx_t *tx) 1050{ 1051 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1052 uint64_t count; 1053 int err; 1054 1055 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1056 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1057 obj, tx); 1058 /* 1059 * The err should not be ENOENT, but a bug in a previous version 1060 * of the code could cause upgrade_clones_cb() to not set 1061 * ds_next_snap_obj when it should, leading to a missing entry. 1062 * If we knew that the pool was created after 1063 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1064 * ENOENT. However, at least we can check that we don't have 1065 * too many entries in the next_clones_obj even after failing to 1066 * remove this one. 1067 */ 1068 if (err != ENOENT) 1069 VERIFY0(err); 1070 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1071 &count)); 1072 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1073} 1074 1075 1076blkptr_t * 1077dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1078{ 1079 return (&dsl_dataset_phys(ds)->ds_bp); 1080} 1081 1082spa_t * 1083dsl_dataset_get_spa(dsl_dataset_t *ds) 1084{ 1085 return (ds->ds_dir->dd_pool->dp_spa); 1086} 1087 1088void 1089dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1090{ 1091 dsl_pool_t *dp; 1092 1093 if (ds == NULL) /* this is the meta-objset */ 1094 return; 1095 1096 ASSERT(ds->ds_objset != NULL); 1097 1098 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1099 panic("dirtying snapshot!"); 1100 1101 /* Must not dirty a dataset in the same txg where it got snapshotted. */ 1102 ASSERT3U(tx->tx_txg, >, dsl_dataset_phys(ds)->ds_prev_snap_txg); 1103 1104 dp = ds->ds_dir->dd_pool; 1105 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1106 /* up the hold count until we can be written out */ 1107 dmu_buf_add_ref(ds->ds_dbuf, ds); 1108 } 1109} 1110 1111boolean_t 1112dsl_dataset_is_dirty(dsl_dataset_t *ds) 1113{ 1114 for (int t = 0; t < TXG_SIZE; t++) { 1115 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1116 ds, t)) 1117 return (B_TRUE); 1118 } 1119 return (B_FALSE); 1120} 1121 1122static int 1123dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1124{ 1125 uint64_t asize; 1126 1127 if (!dmu_tx_is_syncing(tx)) 1128 return (0); 1129 1130 /* 1131 * If there's an fs-only reservation, any blocks that might become 1132 * owned by the snapshot dataset must be accommodated by space 1133 * outside of the reservation. 1134 */ 1135 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1136 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1137 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1138 return (SET_ERROR(ENOSPC)); 1139 1140 /* 1141 * Propagate any reserved space for this snapshot to other 1142 * snapshot checks in this sync group. 1143 */ 1144 if (asize > 0) 1145 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1146 1147 return (0); 1148} 1149 1150typedef struct dsl_dataset_snapshot_arg { 1151 nvlist_t *ddsa_snaps; 1152 nvlist_t *ddsa_props; 1153 nvlist_t *ddsa_errors; 1154 cred_t *ddsa_cr; 1155} dsl_dataset_snapshot_arg_t; 1156 1157int 1158dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1159 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1160{ 1161 int error; 1162 uint64_t value; 1163 1164 ds->ds_trysnap_txg = tx->tx_txg; 1165 1166 if (!dmu_tx_is_syncing(tx)) 1167 return (0); 1168 1169 /* 1170 * We don't allow multiple snapshots of the same txg. If there 1171 * is already one, try again. 1172 */ 1173 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1174 return (SET_ERROR(EAGAIN)); 1175 1176 /* 1177 * Check for conflicting snapshot name. 1178 */ 1179 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1180 if (error == 0) 1181 return (SET_ERROR(EEXIST)); 1182 if (error != ENOENT) 1183 return (error); 1184 1185 /* 1186 * We don't allow taking snapshots of inconsistent datasets, such as 1187 * those into which we are currently receiving. However, if we are 1188 * creating this snapshot as part of a receive, this check will be 1189 * executed atomically with respect to the completion of the receive 1190 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1191 * case we ignore this, knowing it will be fixed up for us shortly in 1192 * dmu_recv_end_sync(). 1193 */ 1194 if (!recv && DS_IS_INCONSISTENT(ds)) 1195 return (SET_ERROR(EBUSY)); 1196 1197 /* 1198 * Skip the check for temporary snapshots or if we have already checked 1199 * the counts in dsl_dataset_snapshot_check. This means we really only 1200 * check the count here when we're receiving a stream. 1201 */ 1202 if (cnt != 0 && cr != NULL) { 1203 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1204 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1205 if (error != 0) 1206 return (error); 1207 } 1208 1209 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1210 if (error != 0) 1211 return (error); 1212 1213 return (0); 1214} 1215 1216static int 1217dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1218{ 1219 dsl_dataset_snapshot_arg_t *ddsa = arg; 1220 dsl_pool_t *dp = dmu_tx_pool(tx); 1221 nvpair_t *pair; 1222 int rv = 0; 1223 1224 /* 1225 * Pre-compute how many total new snapshots will be created for each 1226 * level in the tree and below. This is needed for validating the 1227 * snapshot limit when either taking a recursive snapshot or when 1228 * taking multiple snapshots. 1229 * 1230 * The problem is that the counts are not actually adjusted when 1231 * we are checking, only when we finally sync. For a single snapshot, 1232 * this is easy, the count will increase by 1 at each node up the tree, 1233 * but its more complicated for the recursive/multiple snapshot case. 1234 * 1235 * The dsl_fs_ss_limit_check function does recursively check the count 1236 * at each level up the tree but since it is validating each snapshot 1237 * independently we need to be sure that we are validating the complete 1238 * count for the entire set of snapshots. We do this by rolling up the 1239 * counts for each component of the name into an nvlist and then 1240 * checking each of those cases with the aggregated count. 1241 * 1242 * This approach properly handles not only the recursive snapshot 1243 * case (where we get all of those on the ddsa_snaps list) but also 1244 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1245 * validate the limit on 'a' using a count of 2). 1246 * 1247 * We validate the snapshot names in the third loop and only report 1248 * name errors once. 1249 */ 1250 if (dmu_tx_is_syncing(tx)) { 1251 nvlist_t *cnt_track = NULL; 1252 cnt_track = fnvlist_alloc(); 1253 1254 /* Rollup aggregated counts into the cnt_track list */ 1255 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1256 pair != NULL; 1257 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1258 char *pdelim; 1259 uint64_t val; 1260 char nm[MAXPATHLEN]; 1261 1262 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1263 pdelim = strchr(nm, '@'); 1264 if (pdelim == NULL) 1265 continue; 1266 *pdelim = '\0'; 1267 1268 do { 1269 if (nvlist_lookup_uint64(cnt_track, nm, 1270 &val) == 0) { 1271 /* update existing entry */ 1272 fnvlist_add_uint64(cnt_track, nm, 1273 val + 1); 1274 } else { 1275 /* add to list */ 1276 fnvlist_add_uint64(cnt_track, nm, 1); 1277 } 1278 1279 pdelim = strrchr(nm, '/'); 1280 if (pdelim != NULL) 1281 *pdelim = '\0'; 1282 } while (pdelim != NULL); 1283 } 1284 1285 /* Check aggregated counts at each level */ 1286 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1287 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1288 int error = 0; 1289 char *name; 1290 uint64_t cnt = 0; 1291 dsl_dataset_t *ds; 1292 1293 name = nvpair_name(pair); 1294 cnt = fnvpair_value_uint64(pair); 1295 ASSERT(cnt > 0); 1296 1297 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1298 if (error == 0) { 1299 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1300 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1301 ddsa->ddsa_cr); 1302 dsl_dataset_rele(ds, FTAG); 1303 } 1304 1305 if (error != 0) { 1306 if (ddsa->ddsa_errors != NULL) 1307 fnvlist_add_int32(ddsa->ddsa_errors, 1308 name, error); 1309 rv = error; 1310 /* only report one error for this check */ 1311 break; 1312 } 1313 } 1314 nvlist_free(cnt_track); 1315 } 1316 1317 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1318 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1319 int error = 0; 1320 dsl_dataset_t *ds; 1321 char *name, *atp; 1322 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1323 1324 name = nvpair_name(pair); 1325 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1326 error = SET_ERROR(ENAMETOOLONG); 1327 if (error == 0) { 1328 atp = strchr(name, '@'); 1329 if (atp == NULL) 1330 error = SET_ERROR(EINVAL); 1331 if (error == 0) 1332 (void) strlcpy(dsname, name, atp - name + 1); 1333 } 1334 if (error == 0) 1335 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1336 if (error == 0) { 1337 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1338 error = dsl_dataset_snapshot_check_impl(ds, 1339 atp + 1, tx, B_FALSE, 0, NULL); 1340 dsl_dataset_rele(ds, FTAG); 1341 } 1342 1343 if (error != 0) { 1344 if (ddsa->ddsa_errors != NULL) { 1345 fnvlist_add_int32(ddsa->ddsa_errors, 1346 name, error); 1347 } 1348 rv = error; 1349 } 1350 } 1351 1352 return (rv); 1353} 1354 1355void 1356dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1357 dmu_tx_t *tx) 1358{ 1359 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1360 dmu_buf_t *dbuf; 1361 dsl_dataset_phys_t *dsphys; 1362 uint64_t dsobj, crtxg; 1363 objset_t *mos = dp->dp_meta_objset; 1364 objset_t *os; 1365 1366 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1367 1368 /* 1369 * If we are on an old pool, the zil must not be active, in which 1370 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1371 */ 1372 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1373 dmu_objset_from_ds(ds, &os) != 0 || 1374 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1375 sizeof (zero_zil)) == 0); 1376 1377 /* Should not snapshot a dirty dataset. */ 1378 ASSERT(!txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1379 ds, tx->tx_txg)); 1380 1381 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1382 1383 /* 1384 * The origin's ds_creation_txg has to be < TXG_INITIAL 1385 */ 1386 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1387 crtxg = 1; 1388 else 1389 crtxg = tx->tx_txg; 1390 1391 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1392 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1393 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1394 dmu_buf_will_dirty(dbuf, tx); 1395 dsphys = dbuf->db_data; 1396 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1397 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1398 dsphys->ds_fsid_guid = unique_create(); 1399 do { 1400 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1401 sizeof (dsphys->ds_guid)); 1402 } while (dsphys->ds_guid == 0); 1403 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1404 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1405 dsphys->ds_next_snap_obj = ds->ds_object; 1406 dsphys->ds_num_children = 1; 1407 dsphys->ds_creation_time = gethrestime_sec(); 1408 dsphys->ds_creation_txg = crtxg; 1409 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1410 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1411 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1412 dsphys->ds_uncompressed_bytes = 1413 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1414 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1415 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1416 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1417 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1418 dmu_buf_rele(dbuf, FTAG); 1419 1420 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1421 if (ds->ds_feature_inuse[f]) 1422 dsl_dataset_activate_feature(dsobj, f, tx); 1423 } 1424 1425 ASSERT3U(ds->ds_prev != 0, ==, 1426 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1427 if (ds->ds_prev) { 1428 uint64_t next_clones_obj = 1429 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1430 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1431 ds->ds_object || 1432 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1433 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1434 ds->ds_object) { 1435 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1436 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1437 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1438 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1439 } else if (next_clones_obj != 0) { 1440 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1441 dsphys->ds_next_snap_obj, tx); 1442 VERIFY0(zap_add_int(mos, 1443 next_clones_obj, dsobj, tx)); 1444 } 1445 } 1446 1447 /* 1448 * If we have a reference-reservation on this dataset, we will 1449 * need to increase the amount of refreservation being charged 1450 * since our unique space is going to zero. 1451 */ 1452 if (ds->ds_reserved) { 1453 int64_t delta; 1454 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1455 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1456 ds->ds_reserved); 1457 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1458 delta, 0, 0, tx); 1459 } 1460 1461 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1462 dsl_dataset_phys(ds)->ds_deadlist_obj = 1463 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1464 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1465 dsl_deadlist_close(&ds->ds_deadlist); 1466 dsl_deadlist_open(&ds->ds_deadlist, mos, 1467 dsl_dataset_phys(ds)->ds_deadlist_obj); 1468 dsl_deadlist_add_key(&ds->ds_deadlist, 1469 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1470 1471 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1472 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1473 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1474 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1475 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1476 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1477 1478 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1479 snapname, 8, 1, &dsobj, tx)); 1480 1481 if (ds->ds_prev) 1482 dsl_dataset_rele(ds->ds_prev, ds); 1483 VERIFY0(dsl_dataset_hold_obj(dp, 1484 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1485 1486 dsl_scan_ds_snapshotted(ds, tx); 1487 1488 dsl_dir_snap_cmtime_update(ds->ds_dir); 1489 1490 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1491} 1492 1493static void 1494dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1495{ 1496 dsl_dataset_snapshot_arg_t *ddsa = arg; 1497 dsl_pool_t *dp = dmu_tx_pool(tx); 1498 nvpair_t *pair; 1499 1500 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1501 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1502 dsl_dataset_t *ds; 1503 char *name, *atp; 1504 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1505 1506 name = nvpair_name(pair); 1507 atp = strchr(name, '@'); 1508 (void) strlcpy(dsname, name, atp - name + 1); 1509 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1510 1511 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1512 if (ddsa->ddsa_props != NULL) { 1513 dsl_props_set_sync_impl(ds->ds_prev, 1514 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1515 } 1516 dsl_dataset_rele(ds, FTAG); 1517 } 1518} 1519 1520/* 1521 * The snapshots must all be in the same pool. 1522 * All-or-nothing: if there are any failures, nothing will be modified. 1523 */ 1524int 1525dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1526{ 1527 dsl_dataset_snapshot_arg_t ddsa; 1528 nvpair_t *pair; 1529 boolean_t needsuspend; 1530 int error; 1531 spa_t *spa; 1532 char *firstname; 1533 nvlist_t *suspended = NULL; 1534 1535 pair = nvlist_next_nvpair(snaps, NULL); 1536 if (pair == NULL) 1537 return (0); 1538 firstname = nvpair_name(pair); 1539 1540 error = spa_open(firstname, &spa, FTAG); 1541 if (error != 0) 1542 return (error); 1543 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1544 spa_close(spa, FTAG); 1545 1546 if (needsuspend) { 1547 suspended = fnvlist_alloc(); 1548 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1549 pair = nvlist_next_nvpair(snaps, pair)) { 1550 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1551 char *snapname = nvpair_name(pair); 1552 char *atp; 1553 void *cookie; 1554 1555 atp = strchr(snapname, '@'); 1556 if (atp == NULL) { 1557 error = SET_ERROR(EINVAL); 1558 break; 1559 } 1560 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1561 1562 error = zil_suspend(fsname, &cookie); 1563 if (error != 0) 1564 break; 1565 fnvlist_add_uint64(suspended, fsname, 1566 (uintptr_t)cookie); 1567 } 1568 } 1569 1570 ddsa.ddsa_snaps = snaps; 1571 ddsa.ddsa_props = props; 1572 ddsa.ddsa_errors = errors; 1573 ddsa.ddsa_cr = CRED(); 1574 1575 if (error == 0) { 1576 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1577 dsl_dataset_snapshot_sync, &ddsa, 1578 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1579 } 1580 1581 if (suspended != NULL) { 1582 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1583 pair = nvlist_next_nvpair(suspended, pair)) { 1584 zil_resume((void *)(uintptr_t) 1585 fnvpair_value_uint64(pair)); 1586 } 1587 fnvlist_free(suspended); 1588 } 1589 1590#ifdef __FreeBSD__ 1591#ifdef _KERNEL 1592 if (error == 0) { 1593 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1594 pair = nvlist_next_nvpair(snaps, pair)) { 1595 char *snapname = nvpair_name(pair); 1596 zvol_create_minors(snapname); 1597 } 1598 } 1599#endif 1600#endif 1601 return (error); 1602} 1603 1604typedef struct dsl_dataset_snapshot_tmp_arg { 1605 const char *ddsta_fsname; 1606 const char *ddsta_snapname; 1607 minor_t ddsta_cleanup_minor; 1608 const char *ddsta_htag; 1609} dsl_dataset_snapshot_tmp_arg_t; 1610 1611static int 1612dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1613{ 1614 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1615 dsl_pool_t *dp = dmu_tx_pool(tx); 1616 dsl_dataset_t *ds; 1617 int error; 1618 1619 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1620 if (error != 0) 1621 return (error); 1622 1623 /* NULL cred means no limit check for tmp snapshot */ 1624 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1625 tx, B_FALSE, 0, NULL); 1626 if (error != 0) { 1627 dsl_dataset_rele(ds, FTAG); 1628 return (error); 1629 } 1630 1631 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1632 dsl_dataset_rele(ds, FTAG); 1633 return (SET_ERROR(ENOTSUP)); 1634 } 1635 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1636 B_TRUE, tx); 1637 if (error != 0) { 1638 dsl_dataset_rele(ds, FTAG); 1639 return (error); 1640 } 1641 1642 dsl_dataset_rele(ds, FTAG); 1643 return (0); 1644} 1645 1646static void 1647dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1648{ 1649 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1650 dsl_pool_t *dp = dmu_tx_pool(tx); 1651 dsl_dataset_t *ds; 1652 1653 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1654 1655 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1656 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1657 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1658 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1659 1660 dsl_dataset_rele(ds, FTAG); 1661} 1662 1663int 1664dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1665 minor_t cleanup_minor, const char *htag) 1666{ 1667 dsl_dataset_snapshot_tmp_arg_t ddsta; 1668 int error; 1669 spa_t *spa; 1670 boolean_t needsuspend; 1671 void *cookie; 1672 1673 ddsta.ddsta_fsname = fsname; 1674 ddsta.ddsta_snapname = snapname; 1675 ddsta.ddsta_cleanup_minor = cleanup_minor; 1676 ddsta.ddsta_htag = htag; 1677 1678 error = spa_open(fsname, &spa, FTAG); 1679 if (error != 0) 1680 return (error); 1681 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1682 spa_close(spa, FTAG); 1683 1684 if (needsuspend) { 1685 error = zil_suspend(fsname, &cookie); 1686 if (error != 0) 1687 return (error); 1688 } 1689 1690 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1691 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1692 1693 if (needsuspend) 1694 zil_resume(cookie); 1695 return (error); 1696} 1697 1698 1699void 1700dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1701{ 1702 ASSERT(dmu_tx_is_syncing(tx)); 1703 ASSERT(ds->ds_objset != NULL); 1704 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1705 1706 /* 1707 * in case we had to change ds_fsid_guid when we opened it, 1708 * sync it out now. 1709 */ 1710 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1711 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1712 1713 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1714 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1715 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1716 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1717 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1718 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1719 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1720 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1721 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1722 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1723 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1724 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1725 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1726 } 1727 1728 dmu_objset_sync(ds->ds_objset, zio, tx); 1729 1730 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1731 if (ds->ds_feature_activation_needed[f]) { 1732 if (ds->ds_feature_inuse[f]) 1733 continue; 1734 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1735 ds->ds_feature_inuse[f] = B_TRUE; 1736 } 1737 } 1738} 1739 1740static int 1741deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx) 1742{ 1743 dsl_deadlist_t *dl = arg; 1744 dsl_deadlist_insert(dl, bp, tx); 1745 return (0); 1746} 1747 1748void 1749dsl_dataset_sync_done(dsl_dataset_t *ds, dmu_tx_t *tx) 1750{ 1751 objset_t *os = ds->ds_objset; 1752 1753 bplist_iterate(&ds->ds_pending_deadlist, 1754 deadlist_enqueue_cb, &ds->ds_deadlist, tx); 1755 1756 ASSERT(!dmu_objset_is_dirty(os, dmu_tx_get_txg(tx))); 1757 1758 dmu_buf_rele(ds->ds_dbuf, ds); 1759} 1760 1761static void 1762get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1763{ 1764 uint64_t count = 0; 1765 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1766 zap_cursor_t zc; 1767 zap_attribute_t za; 1768 nvlist_t *propval = fnvlist_alloc(); 1769 nvlist_t *val = fnvlist_alloc(); 1770 1771 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1772 1773 /* 1774 * There may be missing entries in ds_next_clones_obj 1775 * due to a bug in a previous version of the code. 1776 * Only trust it if it has the right number of entries. 1777 */ 1778 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1779 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1780 &count)); 1781 } 1782 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1783 goto fail; 1784 for (zap_cursor_init(&zc, mos, 1785 dsl_dataset_phys(ds)->ds_next_clones_obj); 1786 zap_cursor_retrieve(&zc, &za) == 0; 1787 zap_cursor_advance(&zc)) { 1788 dsl_dataset_t *clone; 1789 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1790 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1791 za.za_first_integer, FTAG, &clone)); 1792 dsl_dir_name(clone->ds_dir, buf); 1793 fnvlist_add_boolean(val, buf); 1794 dsl_dataset_rele(clone, FTAG); 1795 } 1796 zap_cursor_fini(&zc); 1797 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1798 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1799fail: 1800 nvlist_free(val); 1801 nvlist_free(propval); 1802} 1803 1804static void 1805get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1806{ 1807 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1808 1809 if (dsl_dataset_has_resume_receive_state(ds)) { 1810 char *str; 1811 void *packed; 1812 uint8_t *compressed; 1813 uint64_t val; 1814 nvlist_t *token_nv = fnvlist_alloc(); 1815 size_t packed_size, compressed_size; 1816 1817 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1818 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1819 fnvlist_add_uint64(token_nv, "fromguid", val); 1820 } 1821 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1822 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1823 fnvlist_add_uint64(token_nv, "object", val); 1824 } 1825 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1826 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1827 fnvlist_add_uint64(token_nv, "offset", val); 1828 } 1829 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1830 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1831 fnvlist_add_uint64(token_nv, "bytes", val); 1832 } 1833 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1834 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1835 fnvlist_add_uint64(token_nv, "toguid", val); 1836 } 1837 char buf[256]; 1838 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1839 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1840 fnvlist_add_string(token_nv, "toname", buf); 1841 } 1842 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1843 DS_FIELD_RESUME_EMBEDOK) == 0) { 1844 fnvlist_add_boolean(token_nv, "embedok"); 1845 } 1846 packed = fnvlist_pack(token_nv, &packed_size); 1847 fnvlist_free(token_nv); 1848 compressed = kmem_alloc(packed_size, KM_SLEEP); 1849 1850 compressed_size = gzip_compress(packed, compressed, 1851 packed_size, packed_size, 6); 1852 1853 zio_cksum_t cksum; 1854 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1855 1856 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1857 for (int i = 0; i < compressed_size; i++) { 1858 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1859 } 1860 str[compressed_size * 2] = '\0'; 1861 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1862 ZFS_SEND_RESUME_TOKEN_VERSION, 1863 (longlong_t)cksum.zc_word[0], 1864 (longlong_t)packed_size, str); 1865 dsl_prop_nvlist_add_string(nv, 1866 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1867 kmem_free(packed, packed_size); 1868 kmem_free(str, compressed_size * 2 + 1); 1869 kmem_free(compressed, packed_size); 1870 strfree(propval); 1871 } 1872} 1873 1874void 1875dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1876{ 1877 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1878 uint64_t refd, avail, uobjs, aobjs, ratio; 1879 1880 ASSERT(dsl_pool_config_held(dp)); 1881 1882 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1883 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1884 dsl_dataset_phys(ds)->ds_compressed_bytes); 1885 1886 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1887 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1888 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1889 1890 if (ds->ds_is_snapshot) { 1891 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1892 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1893 dsl_dataset_phys(ds)->ds_unique_bytes); 1894 get_clones_stat(ds, nv); 1895 } else { 1896 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1897 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1898 dsl_dataset_name(ds->ds_prev, buf); 1899 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1900 } 1901 1902 dsl_dir_stats(ds->ds_dir, nv); 1903 } 1904 1905 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1906 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1907 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1908 1909 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1910 dsl_dataset_phys(ds)->ds_creation_time); 1911 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1912 dsl_dataset_phys(ds)->ds_creation_txg); 1913 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1914 ds->ds_quota); 1915 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1916 ds->ds_reserved); 1917 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1918 dsl_dataset_phys(ds)->ds_guid); 1919 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1920 dsl_dataset_phys(ds)->ds_unique_bytes); 1921 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1922 ds->ds_object); 1923 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1924 ds->ds_userrefs); 1925 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1926 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1927 1928 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1929 uint64_t written, comp, uncomp; 1930 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1931 dsl_dataset_t *prev; 1932 1933 int err = dsl_dataset_hold_obj(dp, 1934 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1935 if (err == 0) { 1936 err = dsl_dataset_space_written(prev, ds, &written, 1937 &comp, &uncomp); 1938 dsl_dataset_rele(prev, FTAG); 1939 if (err == 0) { 1940 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1941 written); 1942 } 1943 } 1944 } 1945 1946 if (!dsl_dataset_is_snapshot(ds)) { 1947 /* 1948 * A failed "newfs" (e.g. full) resumable receive leaves 1949 * the stats set on this dataset. Check here for the prop. 1950 */ 1951 get_receive_resume_stats(ds, nv); 1952 1953 /* 1954 * A failed incremental resumable receive leaves the 1955 * stats set on our child named "%recv". Check the child 1956 * for the prop. 1957 */ 1958 /* 6 extra bytes for /%recv */ 1959 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1960 dsl_dataset_t *recv_ds; 1961 dsl_dataset_name(ds, recvname); 1962 if (strlcat(recvname, "/", sizeof (recvname)) < 1963 sizeof (recvname) && 1964 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 1965 sizeof (recvname) && 1966 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1967 get_receive_resume_stats(recv_ds, nv); 1968 dsl_dataset_rele(recv_ds, FTAG); 1969 } 1970 } 1971} 1972 1973void 1974dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1975{ 1976 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1977 ASSERT(dsl_pool_config_held(dp)); 1978 1979 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1980 stat->dds_inconsistent = 1981 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1982 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1983 stat->dds_origin[0] = '\0'; 1984 if (ds->ds_is_snapshot) { 1985 stat->dds_is_snapshot = B_TRUE; 1986 stat->dds_num_clones = 1987 dsl_dataset_phys(ds)->ds_num_children - 1; 1988 } else { 1989 stat->dds_is_snapshot = B_FALSE; 1990 stat->dds_num_clones = 0; 1991 1992 if (dsl_dir_is_clone(ds->ds_dir)) { 1993 dsl_dataset_t *ods; 1994 1995 VERIFY0(dsl_dataset_hold_obj(dp, 1996 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1997 FTAG, &ods)); 1998 dsl_dataset_name(ods, stat->dds_origin); 1999 dsl_dataset_rele(ods, FTAG); 2000 } 2001 } 2002} 2003 2004uint64_t 2005dsl_dataset_fsid_guid(dsl_dataset_t *ds) 2006{ 2007 return (ds->ds_fsid_guid); 2008} 2009 2010void 2011dsl_dataset_space(dsl_dataset_t *ds, 2012 uint64_t *refdbytesp, uint64_t *availbytesp, 2013 uint64_t *usedobjsp, uint64_t *availobjsp) 2014{ 2015 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 2016 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 2017 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 2018 *availbytesp += 2019 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 2020 if (ds->ds_quota != 0) { 2021 /* 2022 * Adjust available bytes according to refquota 2023 */ 2024 if (*refdbytesp < ds->ds_quota) 2025 *availbytesp = MIN(*availbytesp, 2026 ds->ds_quota - *refdbytesp); 2027 else 2028 *availbytesp = 0; 2029 } 2030 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2031 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 2032 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2033 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2034} 2035 2036boolean_t 2037dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 2038{ 2039 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2040 uint64_t birth; 2041 2042 ASSERT(dsl_pool_config_held(dp)); 2043 if (snap == NULL) 2044 return (B_FALSE); 2045 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 2046 birth = dsl_dataset_get_blkptr(ds)->blk_birth; 2047 rrw_exit(&ds->ds_bp_rwlock, FTAG); 2048 if (birth > dsl_dataset_phys(snap)->ds_creation_txg) { 2049 objset_t *os, *os_snap; 2050 /* 2051 * It may be that only the ZIL differs, because it was 2052 * reset in the head. Don't count that as being 2053 * modified. 2054 */ 2055 if (dmu_objset_from_ds(ds, &os) != 0) 2056 return (B_TRUE); 2057 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2058 return (B_TRUE); 2059 return (bcmp(&os->os_phys->os_meta_dnode, 2060 &os_snap->os_phys->os_meta_dnode, 2061 sizeof (os->os_phys->os_meta_dnode)) != 0); 2062 } 2063 return (B_FALSE); 2064} 2065 2066typedef struct dsl_dataset_rename_snapshot_arg { 2067 const char *ddrsa_fsname; 2068 const char *ddrsa_oldsnapname; 2069 const char *ddrsa_newsnapname; 2070 boolean_t ddrsa_recursive; 2071 dmu_tx_t *ddrsa_tx; 2072} dsl_dataset_rename_snapshot_arg_t; 2073 2074/* ARGSUSED */ 2075static int 2076dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2077 dsl_dataset_t *hds, void *arg) 2078{ 2079 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2080 int error; 2081 uint64_t val; 2082 2083 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2084 if (error != 0) { 2085 /* ignore nonexistent snapshots */ 2086 return (error == ENOENT ? 0 : error); 2087 } 2088 2089 /* new name should not exist */ 2090 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2091 if (error == 0) 2092 error = SET_ERROR(EEXIST); 2093 else if (error == ENOENT) 2094 error = 0; 2095 2096 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2097 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2098 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2099 error = SET_ERROR(ENAMETOOLONG); 2100 2101 return (error); 2102} 2103 2104static int 2105dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2106{ 2107 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2108 dsl_pool_t *dp = dmu_tx_pool(tx); 2109 dsl_dataset_t *hds; 2110 int error; 2111 2112 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2113 if (error != 0) 2114 return (error); 2115 2116 if (ddrsa->ddrsa_recursive) { 2117 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2118 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2119 DS_FIND_CHILDREN); 2120 } else { 2121 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2122 } 2123 dsl_dataset_rele(hds, FTAG); 2124 return (error); 2125} 2126 2127static int 2128dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2129 dsl_dataset_t *hds, void *arg) 2130{ 2131#ifdef __FreeBSD__ 2132#ifdef _KERNEL 2133 char *oldname, *newname; 2134#endif 2135#endif 2136 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2137 dsl_dataset_t *ds; 2138 uint64_t val; 2139 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2140 int error; 2141 2142 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2143 ASSERT(error == 0 || error == ENOENT); 2144 if (error == ENOENT) { 2145 /* ignore nonexistent snapshots */ 2146 return (0); 2147 } 2148 2149 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2150 2151 /* log before we change the name */ 2152 spa_history_log_internal_ds(ds, "rename", tx, 2153 "-> @%s", ddrsa->ddrsa_newsnapname); 2154 2155 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2156 B_FALSE)); 2157 mutex_enter(&ds->ds_lock); 2158 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2159 mutex_exit(&ds->ds_lock); 2160 VERIFY0(zap_add(dp->dp_meta_objset, 2161 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2162 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2163 2164#ifdef __FreeBSD__ 2165#ifdef _KERNEL 2166 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2167 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2168 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2169 ddrsa->ddrsa_oldsnapname); 2170 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2171 ddrsa->ddrsa_newsnapname); 2172 zfsvfs_update_fromname(oldname, newname); 2173 zvol_rename_minors(oldname, newname); 2174 kmem_free(newname, MAXPATHLEN); 2175 kmem_free(oldname, MAXPATHLEN); 2176#endif 2177#endif 2178 dsl_dataset_rele(ds, FTAG); 2179 2180 return (0); 2181} 2182 2183static void 2184dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2185{ 2186 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2187 dsl_pool_t *dp = dmu_tx_pool(tx); 2188 dsl_dataset_t *hds; 2189 2190 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2191 ddrsa->ddrsa_tx = tx; 2192 if (ddrsa->ddrsa_recursive) { 2193 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2194 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2195 DS_FIND_CHILDREN)); 2196 } else { 2197 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2198 } 2199 dsl_dataset_rele(hds, FTAG); 2200} 2201 2202int 2203dsl_dataset_rename_snapshot(const char *fsname, 2204 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2205{ 2206 dsl_dataset_rename_snapshot_arg_t ddrsa; 2207 2208 ddrsa.ddrsa_fsname = fsname; 2209 ddrsa.ddrsa_oldsnapname = oldsnapname; 2210 ddrsa.ddrsa_newsnapname = newsnapname; 2211 ddrsa.ddrsa_recursive = recursive; 2212 2213 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2214 dsl_dataset_rename_snapshot_sync, &ddrsa, 2215 1, ZFS_SPACE_CHECK_RESERVED)); 2216} 2217 2218/* 2219 * If we're doing an ownership handoff, we need to make sure that there is 2220 * only one long hold on the dataset. We're not allowed to change anything here 2221 * so we don't permanently release the long hold or regular hold here. We want 2222 * to do this only when syncing to avoid the dataset unexpectedly going away 2223 * when we release the long hold. 2224 */ 2225static int 2226dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2227{ 2228 boolean_t held; 2229 2230 if (!dmu_tx_is_syncing(tx)) 2231 return (0); 2232 2233 if (owner != NULL) { 2234 VERIFY3P(ds->ds_owner, ==, owner); 2235 dsl_dataset_long_rele(ds, owner); 2236 } 2237 2238 held = dsl_dataset_long_held(ds); 2239 2240 if (owner != NULL) 2241 dsl_dataset_long_hold(ds, owner); 2242 2243 if (held) 2244 return (SET_ERROR(EBUSY)); 2245 2246 return (0); 2247} 2248 2249typedef struct dsl_dataset_rollback_arg { 2250 const char *ddra_fsname; 2251 void *ddra_owner; 2252 nvlist_t *ddra_result; 2253} dsl_dataset_rollback_arg_t; 2254 2255static int 2256dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2257{ 2258 dsl_dataset_rollback_arg_t *ddra = arg; 2259 dsl_pool_t *dp = dmu_tx_pool(tx); 2260 dsl_dataset_t *ds; 2261 int64_t unused_refres_delta; 2262 int error; 2263 2264 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2265 if (error != 0) 2266 return (error); 2267 2268 /* must not be a snapshot */ 2269 if (ds->ds_is_snapshot) { 2270 dsl_dataset_rele(ds, FTAG); 2271 return (SET_ERROR(EINVAL)); 2272 } 2273 2274 /* must have a most recent snapshot */ 2275 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2276 dsl_dataset_rele(ds, FTAG); 2277 return (SET_ERROR(EINVAL)); 2278 } 2279 2280 /* 2281 * No rollback to a snapshot created in the current txg, because 2282 * the rollback may dirty the dataset and create blocks that are 2283 * not reachable from the rootbp while having a birth txg that 2284 * falls into the snapshot's range. 2285 */ 2286 if (dmu_tx_is_syncing(tx) && 2287 dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) { 2288 dsl_dataset_rele(ds, FTAG); 2289 return (SET_ERROR(EAGAIN)); 2290 } 2291 2292 /* must not have any bookmarks after the most recent snapshot */ 2293 nvlist_t *proprequest = fnvlist_alloc(); 2294 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2295 nvlist_t *bookmarks = fnvlist_alloc(); 2296 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2297 fnvlist_free(proprequest); 2298 if (error != 0) 2299 return (error); 2300 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2301 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2302 nvlist_t *valuenv = 2303 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2304 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2305 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2306 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2307 fnvlist_free(bookmarks); 2308 dsl_dataset_rele(ds, FTAG); 2309 return (SET_ERROR(EEXIST)); 2310 } 2311 } 2312 fnvlist_free(bookmarks); 2313 2314 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2315 if (error != 0) { 2316 dsl_dataset_rele(ds, FTAG); 2317 return (error); 2318 } 2319 2320 /* 2321 * Check if the snap we are rolling back to uses more than 2322 * the refquota. 2323 */ 2324 if (ds->ds_quota != 0 && 2325 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2326 dsl_dataset_rele(ds, FTAG); 2327 return (SET_ERROR(EDQUOT)); 2328 } 2329 2330 /* 2331 * When we do the clone swap, we will temporarily use more space 2332 * due to the refreservation (the head will no longer have any 2333 * unique space, so the entire amount of the refreservation will need 2334 * to be free). We will immediately destroy the clone, freeing 2335 * this space, but the freeing happens over many txg's. 2336 */ 2337 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2338 dsl_dataset_phys(ds)->ds_unique_bytes); 2339 2340 if (unused_refres_delta > 0 && 2341 unused_refres_delta > 2342 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2343 dsl_dataset_rele(ds, FTAG); 2344 return (SET_ERROR(ENOSPC)); 2345 } 2346 2347 dsl_dataset_rele(ds, FTAG); 2348 return (0); 2349} 2350 2351static void 2352dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2353{ 2354 dsl_dataset_rollback_arg_t *ddra = arg; 2355 dsl_pool_t *dp = dmu_tx_pool(tx); 2356 dsl_dataset_t *ds, *clone; 2357 uint64_t cloneobj; 2358 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2359 2360 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2361 2362 dsl_dataset_name(ds->ds_prev, namebuf); 2363 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2364 2365 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2366 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2367 2368 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2369 2370 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2371 dsl_dataset_zero_zil(ds, tx); 2372 2373 dsl_destroy_head_sync_impl(clone, tx); 2374 2375 dsl_dataset_rele(clone, FTAG); 2376 dsl_dataset_rele(ds, FTAG); 2377} 2378 2379/* 2380 * Rolls back the given filesystem or volume to the most recent snapshot. 2381 * The name of the most recent snapshot will be returned under key "target" 2382 * in the result nvlist. 2383 * 2384 * If owner != NULL: 2385 * - The existing dataset MUST be owned by the specified owner at entry 2386 * - Upon return, dataset will still be held by the same owner, whether we 2387 * succeed or not. 2388 * 2389 * This mode is required any time the existing filesystem is mounted. See 2390 * notes above zfs_suspend_fs() for further details. 2391 */ 2392int 2393dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2394{ 2395 dsl_dataset_rollback_arg_t ddra; 2396 2397 ddra.ddra_fsname = fsname; 2398 ddra.ddra_owner = owner; 2399 ddra.ddra_result = result; 2400 2401 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2402 dsl_dataset_rollback_sync, &ddra, 2403 1, ZFS_SPACE_CHECK_RESERVED)); 2404} 2405 2406struct promotenode { 2407 list_node_t link; 2408 dsl_dataset_t *ds; 2409}; 2410 2411typedef struct dsl_dataset_promote_arg { 2412 const char *ddpa_clonename; 2413 dsl_dataset_t *ddpa_clone; 2414 list_t shared_snaps, origin_snaps, clone_snaps; 2415 dsl_dataset_t *origin_origin; /* origin of the origin */ 2416 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2417 char *err_ds; 2418 cred_t *cr; 2419} dsl_dataset_promote_arg_t; 2420 2421static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2422static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2423 void *tag); 2424static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2425 2426static int 2427dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2428{ 2429 dsl_dataset_promote_arg_t *ddpa = arg; 2430 dsl_pool_t *dp = dmu_tx_pool(tx); 2431 dsl_dataset_t *hds; 2432 struct promotenode *snap; 2433 dsl_dataset_t *origin_ds; 2434 int err; 2435 uint64_t unused; 2436 uint64_t ss_mv_cnt; 2437 size_t max_snap_len; 2438 2439 err = promote_hold(ddpa, dp, FTAG); 2440 if (err != 0) 2441 return (err); 2442 2443 hds = ddpa->ddpa_clone; 2444 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2445 2446 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2447 promote_rele(ddpa, FTAG); 2448 return (SET_ERROR(EXDEV)); 2449 } 2450 2451 /* 2452 * Compute and check the amount of space to transfer. Since this is 2453 * so expensive, don't do the preliminary check. 2454 */ 2455 if (!dmu_tx_is_syncing(tx)) { 2456 promote_rele(ddpa, FTAG); 2457 return (0); 2458 } 2459 2460 snap = list_head(&ddpa->shared_snaps); 2461 origin_ds = snap->ds; 2462 2463 /* compute origin's new unique space */ 2464 snap = list_tail(&ddpa->clone_snaps); 2465 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2466 origin_ds->ds_object); 2467 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2468 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2469 &ddpa->unique, &unused, &unused); 2470 2471 /* 2472 * Walk the snapshots that we are moving 2473 * 2474 * Compute space to transfer. Consider the incremental changes 2475 * to used by each snapshot: 2476 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2477 * So each snapshot gave birth to: 2478 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2479 * So a sequence would look like: 2480 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2481 * Which simplifies to: 2482 * uN + kN + kN-1 + ... + k1 + k0 2483 * Note however, if we stop before we reach the ORIGIN we get: 2484 * uN + kN + kN-1 + ... + kM - uM-1 2485 */ 2486 ss_mv_cnt = 0; 2487 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2488 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2489 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2490 for (snap = list_head(&ddpa->shared_snaps); snap; 2491 snap = list_next(&ddpa->shared_snaps, snap)) { 2492 uint64_t val, dlused, dlcomp, dluncomp; 2493 dsl_dataset_t *ds = snap->ds; 2494 2495 ss_mv_cnt++; 2496 2497 /* 2498 * If there are long holds, we won't be able to evict 2499 * the objset. 2500 */ 2501 if (dsl_dataset_long_held(ds)) { 2502 err = SET_ERROR(EBUSY); 2503 goto out; 2504 } 2505 2506 /* Check that the snapshot name does not conflict */ 2507 VERIFY0(dsl_dataset_get_snapname(ds)); 2508 if (strlen(ds->ds_snapname) >= max_snap_len) { 2509 err = SET_ERROR(ENAMETOOLONG); 2510 goto out; 2511 } 2512 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2513 if (err == 0) { 2514 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2515 err = SET_ERROR(EEXIST); 2516 goto out; 2517 } 2518 if (err != ENOENT) 2519 goto out; 2520 2521 /* The very first snapshot does not have a deadlist */ 2522 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2523 continue; 2524 2525 dsl_deadlist_space(&ds->ds_deadlist, 2526 &dlused, &dlcomp, &dluncomp); 2527 ddpa->used += dlused; 2528 ddpa->comp += dlcomp; 2529 ddpa->uncomp += dluncomp; 2530 } 2531 2532 /* 2533 * If we are a clone of a clone then we never reached ORIGIN, 2534 * so we need to subtract out the clone origin's used space. 2535 */ 2536 if (ddpa->origin_origin) { 2537 ddpa->used -= 2538 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2539 ddpa->comp -= 2540 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2541 ddpa->uncomp -= 2542 dsl_dataset_phys(ddpa->origin_origin)-> 2543 ds_uncompressed_bytes; 2544 } 2545 2546 /* Check that there is enough space and limit headroom here */ 2547 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2548 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2549 if (err != 0) 2550 goto out; 2551 2552 /* 2553 * Compute the amounts of space that will be used by snapshots 2554 * after the promotion (for both origin and clone). For each, 2555 * it is the amount of space that will be on all of their 2556 * deadlists (that was not born before their new origin). 2557 */ 2558 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2559 uint64_t space; 2560 2561 /* 2562 * Note, typically this will not be a clone of a clone, 2563 * so dd_origin_txg will be < TXG_INITIAL, so 2564 * these snaplist_space() -> dsl_deadlist_space_range() 2565 * calls will be fast because they do not have to 2566 * iterate over all bps. 2567 */ 2568 snap = list_head(&ddpa->origin_snaps); 2569 err = snaplist_space(&ddpa->shared_snaps, 2570 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2571 if (err != 0) 2572 goto out; 2573 2574 err = snaplist_space(&ddpa->clone_snaps, 2575 snap->ds->ds_dir->dd_origin_txg, &space); 2576 if (err != 0) 2577 goto out; 2578 ddpa->cloneusedsnap += space; 2579 } 2580 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2581 DD_FLAG_USED_BREAKDOWN) { 2582 err = snaplist_space(&ddpa->origin_snaps, 2583 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2584 &ddpa->originusedsnap); 2585 if (err != 0) 2586 goto out; 2587 } 2588 2589out: 2590 promote_rele(ddpa, FTAG); 2591 return (err); 2592} 2593 2594static void 2595dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2596{ 2597 dsl_dataset_promote_arg_t *ddpa = arg; 2598 dsl_pool_t *dp = dmu_tx_pool(tx); 2599 dsl_dataset_t *hds; 2600 struct promotenode *snap; 2601 dsl_dataset_t *origin_ds; 2602 dsl_dataset_t *origin_head; 2603 dsl_dir_t *dd; 2604 dsl_dir_t *odd = NULL; 2605 uint64_t oldnext_obj; 2606 int64_t delta; 2607#if defined(__FreeBSD__) && defined(_KERNEL) 2608 char *oldname, *newname; 2609#endif 2610 2611 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2612 hds = ddpa->ddpa_clone; 2613 2614 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2615 2616 snap = list_head(&ddpa->shared_snaps); 2617 origin_ds = snap->ds; 2618 dd = hds->ds_dir; 2619 2620 snap = list_head(&ddpa->origin_snaps); 2621 origin_head = snap->ds; 2622 2623 /* 2624 * We need to explicitly open odd, since origin_ds's dd will be 2625 * changing. 2626 */ 2627 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2628 NULL, FTAG, &odd)); 2629 2630 /* change origin's next snap */ 2631 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2632 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2633 snap = list_tail(&ddpa->clone_snaps); 2634 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2635 origin_ds->ds_object); 2636 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2637 2638 /* change the origin's next clone */ 2639 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2640 dsl_dataset_remove_from_next_clones(origin_ds, 2641 snap->ds->ds_object, tx); 2642 VERIFY0(zap_add_int(dp->dp_meta_objset, 2643 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2644 oldnext_obj, tx)); 2645 } 2646 2647 /* change origin */ 2648 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2649 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2650 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2651 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2652 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2653 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2654 origin_head->ds_dir->dd_origin_txg = 2655 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2656 2657 /* change dd_clone entries */ 2658 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2659 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2660 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2661 VERIFY0(zap_add_int(dp->dp_meta_objset, 2662 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2663 hds->ds_object, tx)); 2664 2665 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2666 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2667 origin_head->ds_object, tx)); 2668 if (dsl_dir_phys(dd)->dd_clones == 0) { 2669 dsl_dir_phys(dd)->dd_clones = 2670 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2671 DMU_OT_NONE, 0, tx); 2672 } 2673 VERIFY0(zap_add_int(dp->dp_meta_objset, 2674 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2675 } 2676 2677#if defined(__FreeBSD__) && defined(_KERNEL) 2678 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2679 mutex_enter(&spa_namespace_lock); 2680 2681 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2682 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2683#endif 2684 2685 /* move snapshots to this dir */ 2686 for (snap = list_head(&ddpa->shared_snaps); snap; 2687 snap = list_next(&ddpa->shared_snaps, snap)) { 2688 dsl_dataset_t *ds = snap->ds; 2689 2690 /* 2691 * Property callbacks are registered to a particular 2692 * dsl_dir. Since ours is changing, evict the objset 2693 * so that they will be unregistered from the old dsl_dir. 2694 */ 2695 if (ds->ds_objset) { 2696 dmu_objset_evict(ds->ds_objset); 2697 ds->ds_objset = NULL; 2698 } 2699 2700 /* move snap name entry */ 2701 VERIFY0(dsl_dataset_get_snapname(ds)); 2702 VERIFY0(dsl_dataset_snap_remove(origin_head, 2703 ds->ds_snapname, tx, B_TRUE)); 2704 VERIFY0(zap_add(dp->dp_meta_objset, 2705 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2706 8, 1, &ds->ds_object, tx)); 2707 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2708 DD_FIELD_SNAPSHOT_COUNT, tx); 2709 2710 /* change containing dsl_dir */ 2711 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2712 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2713 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2714 ASSERT3P(ds->ds_dir, ==, odd); 2715 dsl_dir_rele(ds->ds_dir, ds); 2716 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2717 NULL, ds, &ds->ds_dir)); 2718 2719#if defined(__FreeBSD__) && defined(_KERNEL) 2720 dsl_dataset_name(ds, newname); 2721 zfsvfs_update_fromname(oldname, newname); 2722 zvol_rename_minors(oldname, newname); 2723#endif 2724 2725 /* move any clone references */ 2726 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2727 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2728 zap_cursor_t zc; 2729 zap_attribute_t za; 2730 2731 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2732 dsl_dataset_phys(ds)->ds_next_clones_obj); 2733 zap_cursor_retrieve(&zc, &za) == 0; 2734 zap_cursor_advance(&zc)) { 2735 dsl_dataset_t *cnds; 2736 uint64_t o; 2737 2738 if (za.za_first_integer == oldnext_obj) { 2739 /* 2740 * We've already moved the 2741 * origin's reference. 2742 */ 2743 continue; 2744 } 2745 2746 VERIFY0(dsl_dataset_hold_obj(dp, 2747 za.za_first_integer, FTAG, &cnds)); 2748 o = dsl_dir_phys(cnds->ds_dir)-> 2749 dd_head_dataset_obj; 2750 2751 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2752 dsl_dir_phys(odd)->dd_clones, o, tx)); 2753 VERIFY0(zap_add_int(dp->dp_meta_objset, 2754 dsl_dir_phys(dd)->dd_clones, o, tx)); 2755 dsl_dataset_rele(cnds, FTAG); 2756 } 2757 zap_cursor_fini(&zc); 2758 } 2759 2760 ASSERT(!dsl_prop_hascb(ds)); 2761 } 2762 2763#if defined(__FreeBSD__) && defined(_KERNEL) 2764 mutex_exit(&spa_namespace_lock); 2765 2766 kmem_free(newname, MAXPATHLEN); 2767 kmem_free(oldname, MAXPATHLEN); 2768#endif 2769 /* 2770 * Change space accounting. 2771 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2772 * both be valid, or both be 0 (resulting in delta == 0). This 2773 * is true for each of {clone,origin} independently. 2774 */ 2775 2776 delta = ddpa->cloneusedsnap - 2777 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2778 ASSERT3S(delta, >=, 0); 2779 ASSERT3U(ddpa->used, >=, delta); 2780 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2781 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2782 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2783 2784 delta = ddpa->originusedsnap - 2785 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2786 ASSERT3S(delta, <=, 0); 2787 ASSERT3U(ddpa->used, >=, -delta); 2788 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2789 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2790 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2791 2792 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2793 2794 /* log history record */ 2795 spa_history_log_internal_ds(hds, "promote", tx, ""); 2796 2797 dsl_dir_rele(odd, FTAG); 2798 promote_rele(ddpa, FTAG); 2799} 2800 2801/* 2802 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2803 * (exclusive) and last_obj (inclusive). The list will be in reverse 2804 * order (last_obj will be the list_head()). If first_obj == 0, do all 2805 * snapshots back to this dataset's origin. 2806 */ 2807static int 2808snaplist_make(dsl_pool_t *dp, 2809 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2810{ 2811 uint64_t obj = last_obj; 2812 2813 list_create(l, sizeof (struct promotenode), 2814 offsetof(struct promotenode, link)); 2815 2816 while (obj != first_obj) { 2817 dsl_dataset_t *ds; 2818 struct promotenode *snap; 2819 int err; 2820 2821 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2822 ASSERT(err != ENOENT); 2823 if (err != 0) 2824 return (err); 2825 2826 if (first_obj == 0) 2827 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2828 2829 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2830 snap->ds = ds; 2831 list_insert_tail(l, snap); 2832 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2833 } 2834 2835 return (0); 2836} 2837 2838static int 2839snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2840{ 2841 struct promotenode *snap; 2842 2843 *spacep = 0; 2844 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2845 uint64_t used, comp, uncomp; 2846 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2847 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2848 *spacep += used; 2849 } 2850 return (0); 2851} 2852 2853static void 2854snaplist_destroy(list_t *l, void *tag) 2855{ 2856 struct promotenode *snap; 2857 2858 if (l == NULL || !list_link_active(&l->list_head)) 2859 return; 2860 2861 while ((snap = list_tail(l)) != NULL) { 2862 list_remove(l, snap); 2863 dsl_dataset_rele(snap->ds, tag); 2864 kmem_free(snap, sizeof (*snap)); 2865 } 2866 list_destroy(l); 2867} 2868 2869static int 2870promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2871{ 2872 int error; 2873 dsl_dir_t *dd; 2874 struct promotenode *snap; 2875 2876 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2877 &ddpa->ddpa_clone); 2878 if (error != 0) 2879 return (error); 2880 dd = ddpa->ddpa_clone->ds_dir; 2881 2882 if (ddpa->ddpa_clone->ds_is_snapshot || 2883 !dsl_dir_is_clone(dd)) { 2884 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2885 return (SET_ERROR(EINVAL)); 2886 } 2887 2888 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2889 &ddpa->shared_snaps, tag); 2890 if (error != 0) 2891 goto out; 2892 2893 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2894 &ddpa->clone_snaps, tag); 2895 if (error != 0) 2896 goto out; 2897 2898 snap = list_head(&ddpa->shared_snaps); 2899 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2900 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2901 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2902 &ddpa->origin_snaps, tag); 2903 if (error != 0) 2904 goto out; 2905 2906 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2907 error = dsl_dataset_hold_obj(dp, 2908 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2909 tag, &ddpa->origin_origin); 2910 if (error != 0) 2911 goto out; 2912 } 2913out: 2914 if (error != 0) 2915 promote_rele(ddpa, tag); 2916 return (error); 2917} 2918 2919static void 2920promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2921{ 2922 snaplist_destroy(&ddpa->shared_snaps, tag); 2923 snaplist_destroy(&ddpa->clone_snaps, tag); 2924 snaplist_destroy(&ddpa->origin_snaps, tag); 2925 if (ddpa->origin_origin != NULL) 2926 dsl_dataset_rele(ddpa->origin_origin, tag); 2927 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2928} 2929 2930/* 2931 * Promote a clone. 2932 * 2933 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2934 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 2935 */ 2936int 2937dsl_dataset_promote(const char *name, char *conflsnap) 2938{ 2939 dsl_dataset_promote_arg_t ddpa = { 0 }; 2940 uint64_t numsnaps; 2941 int error; 2942 objset_t *os; 2943 2944 /* 2945 * We will modify space proportional to the number of 2946 * snapshots. Compute numsnaps. 2947 */ 2948 error = dmu_objset_hold(name, FTAG, &os); 2949 if (error != 0) 2950 return (error); 2951 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2952 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2953 &numsnaps); 2954 dmu_objset_rele(os, FTAG); 2955 if (error != 0) 2956 return (error); 2957 2958 ddpa.ddpa_clonename = name; 2959 ddpa.err_ds = conflsnap; 2960 ddpa.cr = CRED(); 2961 2962 return (dsl_sync_task(name, dsl_dataset_promote_check, 2963 dsl_dataset_promote_sync, &ddpa, 2964 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2965} 2966 2967int 2968dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2969 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2970{ 2971 /* 2972 * "slack" factor for received datasets with refquota set on them. 2973 * See the bottom of this function for details on its use. 2974 */ 2975 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 2976 int64_t unused_refres_delta; 2977 2978 /* they should both be heads */ 2979 if (clone->ds_is_snapshot || 2980 origin_head->ds_is_snapshot) 2981 return (SET_ERROR(EINVAL)); 2982 2983 /* if we are not forcing, the branch point should be just before them */ 2984 if (!force && clone->ds_prev != origin_head->ds_prev) 2985 return (SET_ERROR(EINVAL)); 2986 2987 /* clone should be the clone (unless they are unrelated) */ 2988 if (clone->ds_prev != NULL && 2989 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2990 origin_head->ds_dir != clone->ds_prev->ds_dir) 2991 return (SET_ERROR(EINVAL)); 2992 2993 /* the clone should be a child of the origin */ 2994 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2995 return (SET_ERROR(EINVAL)); 2996 2997 /* origin_head shouldn't be modified unless 'force' */ 2998 if (!force && 2999 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 3000 return (SET_ERROR(ETXTBSY)); 3001 3002 /* origin_head should have no long holds (e.g. is not mounted) */ 3003 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 3004 return (SET_ERROR(EBUSY)); 3005 3006 /* check amount of any unconsumed refreservation */ 3007 unused_refres_delta = 3008 (int64_t)MIN(origin_head->ds_reserved, 3009 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3010 (int64_t)MIN(origin_head->ds_reserved, 3011 dsl_dataset_phys(clone)->ds_unique_bytes); 3012 3013 if (unused_refres_delta > 0 && 3014 unused_refres_delta > 3015 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 3016 return (SET_ERROR(ENOSPC)); 3017 3018 /* 3019 * The clone can't be too much over the head's refquota. 3020 * 3021 * To ensure that the entire refquota can be used, we allow one 3022 * transaction to exceed the the refquota. Therefore, this check 3023 * needs to also allow for the space referenced to be more than the 3024 * refquota. The maximum amount of space that one transaction can use 3025 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 3026 * overage ensures that we are able to receive a filesystem that 3027 * exceeds the refquota on the source system. 3028 * 3029 * So that overage is the refquota_slack we use below. 3030 */ 3031 if (origin_head->ds_quota != 0 && 3032 dsl_dataset_phys(clone)->ds_referenced_bytes > 3033 origin_head->ds_quota + refquota_slack) 3034 return (SET_ERROR(EDQUOT)); 3035 3036 return (0); 3037} 3038 3039void 3040dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 3041 dsl_dataset_t *origin_head, dmu_tx_t *tx) 3042{ 3043 dsl_pool_t *dp = dmu_tx_pool(tx); 3044 int64_t unused_refres_delta; 3045 3046 ASSERT(clone->ds_reserved == 0); 3047 /* 3048 * NOTE: On DEBUG kernels there could be a race between this and 3049 * the check function if spa_asize_inflation is adjusted... 3050 */ 3051 ASSERT(origin_head->ds_quota == 0 || 3052 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 3053 DMU_MAX_ACCESS * spa_asize_inflation); 3054 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 3055 3056 /* 3057 * Swap per-dataset feature flags. 3058 */ 3059 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 3060 if (!(spa_feature_table[f].fi_flags & 3061 ZFEATURE_FLAG_PER_DATASET)) { 3062 ASSERT(!clone->ds_feature_inuse[f]); 3063 ASSERT(!origin_head->ds_feature_inuse[f]); 3064 continue; 3065 } 3066 3067 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3068 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3069 3070 if (clone_inuse) { 3071 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3072 clone->ds_feature_inuse[f] = B_FALSE; 3073 } 3074 if (origin_head_inuse) { 3075 dsl_dataset_deactivate_feature(origin_head->ds_object, 3076 f, tx); 3077 origin_head->ds_feature_inuse[f] = B_FALSE; 3078 } 3079 if (clone_inuse) { 3080 dsl_dataset_activate_feature(origin_head->ds_object, 3081 f, tx); 3082 origin_head->ds_feature_inuse[f] = B_TRUE; 3083 } 3084 if (origin_head_inuse) { 3085 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3086 clone->ds_feature_inuse[f] = B_TRUE; 3087 } 3088 } 3089 3090 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3091 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3092 3093 if (clone->ds_objset != NULL) { 3094 dmu_objset_evict(clone->ds_objset); 3095 clone->ds_objset = NULL; 3096 } 3097 3098 if (origin_head->ds_objset != NULL) { 3099 dmu_objset_evict(origin_head->ds_objset); 3100 origin_head->ds_objset = NULL; 3101 } 3102 3103 unused_refres_delta = 3104 (int64_t)MIN(origin_head->ds_reserved, 3105 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3106 (int64_t)MIN(origin_head->ds_reserved, 3107 dsl_dataset_phys(clone)->ds_unique_bytes); 3108 3109 /* 3110 * Reset origin's unique bytes, if it exists. 3111 */ 3112 if (clone->ds_prev) { 3113 dsl_dataset_t *origin = clone->ds_prev; 3114 uint64_t comp, uncomp; 3115 3116 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3117 dsl_deadlist_space_range(&clone->ds_deadlist, 3118 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3119 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3120 } 3121 3122 /* swap blkptrs */ 3123 { 3124 rrw_enter(&clone->ds_bp_rwlock, RW_WRITER, FTAG); 3125 rrw_enter(&origin_head->ds_bp_rwlock, RW_WRITER, FTAG); 3126 blkptr_t tmp; 3127 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3128 dsl_dataset_phys(origin_head)->ds_bp = 3129 dsl_dataset_phys(clone)->ds_bp; 3130 dsl_dataset_phys(clone)->ds_bp = tmp; 3131 rrw_exit(&origin_head->ds_bp_rwlock, FTAG); 3132 rrw_exit(&clone->ds_bp_rwlock, FTAG); 3133 } 3134 3135 /* set dd_*_bytes */ 3136 { 3137 int64_t dused, dcomp, duncomp; 3138 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3139 uint64_t odl_used, odl_comp, odl_uncomp; 3140 3141 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3142 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3143 3144 dsl_deadlist_space(&clone->ds_deadlist, 3145 &cdl_used, &cdl_comp, &cdl_uncomp); 3146 dsl_deadlist_space(&origin_head->ds_deadlist, 3147 &odl_used, &odl_comp, &odl_uncomp); 3148 3149 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3150 cdl_used - 3151 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3152 odl_used); 3153 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3154 cdl_comp - 3155 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3156 odl_comp); 3157 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3158 cdl_uncomp - 3159 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3160 odl_uncomp); 3161 3162 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3163 dused, dcomp, duncomp, tx); 3164 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3165 -dused, -dcomp, -duncomp, tx); 3166 3167 /* 3168 * The difference in the space used by snapshots is the 3169 * difference in snapshot space due to the head's 3170 * deadlist (since that's the only thing that's 3171 * changing that affects the snapused). 3172 */ 3173 dsl_deadlist_space_range(&clone->ds_deadlist, 3174 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3175 &cdl_used, &cdl_comp, &cdl_uncomp); 3176 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3177 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3178 &odl_used, &odl_comp, &odl_uncomp); 3179 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3180 DD_USED_HEAD, DD_USED_SNAP, NULL); 3181 } 3182 3183 /* swap ds_*_bytes */ 3184 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3185 dsl_dataset_phys(clone)->ds_referenced_bytes); 3186 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3187 dsl_dataset_phys(clone)->ds_compressed_bytes); 3188 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3189 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3190 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3191 dsl_dataset_phys(clone)->ds_unique_bytes); 3192 3193 /* apply any parent delta for change in unconsumed refreservation */ 3194 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3195 unused_refres_delta, 0, 0, tx); 3196 3197 /* 3198 * Swap deadlists. 3199 */ 3200 dsl_deadlist_close(&clone->ds_deadlist); 3201 dsl_deadlist_close(&origin_head->ds_deadlist); 3202 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3203 dsl_dataset_phys(clone)->ds_deadlist_obj); 3204 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3205 dsl_dataset_phys(clone)->ds_deadlist_obj); 3206 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3207 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3208 3209 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3210 3211 spa_history_log_internal_ds(clone, "clone swap", tx, 3212 "parent=%s", origin_head->ds_dir->dd_myname); 3213} 3214 3215/* 3216 * Given a pool name and a dataset object number in that pool, 3217 * return the name of that dataset. 3218 */ 3219int 3220dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3221{ 3222 dsl_pool_t *dp; 3223 dsl_dataset_t *ds; 3224 int error; 3225 3226 error = dsl_pool_hold(pname, FTAG, &dp); 3227 if (error != 0) 3228 return (error); 3229 3230 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3231 if (error == 0) { 3232 dsl_dataset_name(ds, buf); 3233 dsl_dataset_rele(ds, FTAG); 3234 } 3235 dsl_pool_rele(dp, FTAG); 3236 3237 return (error); 3238} 3239 3240int 3241dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3242 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3243{ 3244 int error = 0; 3245 3246 ASSERT3S(asize, >, 0); 3247 3248 /* 3249 * *ref_rsrv is the portion of asize that will come from any 3250 * unconsumed refreservation space. 3251 */ 3252 *ref_rsrv = 0; 3253 3254 mutex_enter(&ds->ds_lock); 3255 /* 3256 * Make a space adjustment for reserved bytes. 3257 */ 3258 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3259 ASSERT3U(*used, >=, 3260 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3261 *used -= 3262 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3263 *ref_rsrv = 3264 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3265 } 3266 3267 if (!check_quota || ds->ds_quota == 0) { 3268 mutex_exit(&ds->ds_lock); 3269 return (0); 3270 } 3271 /* 3272 * If they are requesting more space, and our current estimate 3273 * is over quota, they get to try again unless the actual 3274 * on-disk is over quota and there are no pending changes (which 3275 * may free up space for us). 3276 */ 3277 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3278 ds->ds_quota) { 3279 if (inflight > 0 || 3280 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3281 error = SET_ERROR(ERESTART); 3282 else 3283 error = SET_ERROR(EDQUOT); 3284 } 3285 mutex_exit(&ds->ds_lock); 3286 3287 return (error); 3288} 3289 3290typedef struct dsl_dataset_set_qr_arg { 3291 const char *ddsqra_name; 3292 zprop_source_t ddsqra_source; 3293 uint64_t ddsqra_value; 3294} dsl_dataset_set_qr_arg_t; 3295 3296 3297/* ARGSUSED */ 3298static int 3299dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3300{ 3301 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3302 dsl_pool_t *dp = dmu_tx_pool(tx); 3303 dsl_dataset_t *ds; 3304 int error; 3305 uint64_t newval; 3306 3307 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3308 return (SET_ERROR(ENOTSUP)); 3309 3310 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3311 if (error != 0) 3312 return (error); 3313 3314 if (ds->ds_is_snapshot) { 3315 dsl_dataset_rele(ds, FTAG); 3316 return (SET_ERROR(EINVAL)); 3317 } 3318 3319 error = dsl_prop_predict(ds->ds_dir, 3320 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3321 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3322 if (error != 0) { 3323 dsl_dataset_rele(ds, FTAG); 3324 return (error); 3325 } 3326 3327 if (newval == 0) { 3328 dsl_dataset_rele(ds, FTAG); 3329 return (0); 3330 } 3331 3332 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3333 newval < ds->ds_reserved) { 3334 dsl_dataset_rele(ds, FTAG); 3335 return (SET_ERROR(ENOSPC)); 3336 } 3337 3338 dsl_dataset_rele(ds, FTAG); 3339 return (0); 3340} 3341 3342static void 3343dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3344{ 3345 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3346 dsl_pool_t *dp = dmu_tx_pool(tx); 3347 dsl_dataset_t *ds; 3348 uint64_t newval; 3349 3350 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3351 3352 dsl_prop_set_sync_impl(ds, 3353 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3354 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3355 &ddsqra->ddsqra_value, tx); 3356 3357 VERIFY0(dsl_prop_get_int_ds(ds, 3358 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3359 3360 if (ds->ds_quota != newval) { 3361 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3362 ds->ds_quota = newval; 3363 } 3364 dsl_dataset_rele(ds, FTAG); 3365} 3366 3367int 3368dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3369 uint64_t refquota) 3370{ 3371 dsl_dataset_set_qr_arg_t ddsqra; 3372 3373 ddsqra.ddsqra_name = dsname; 3374 ddsqra.ddsqra_source = source; 3375 ddsqra.ddsqra_value = refquota; 3376 3377 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3378 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3379} 3380 3381static int 3382dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3383{ 3384 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3385 dsl_pool_t *dp = dmu_tx_pool(tx); 3386 dsl_dataset_t *ds; 3387 int error; 3388 uint64_t newval, unique; 3389 3390 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3391 return (SET_ERROR(ENOTSUP)); 3392 3393 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3394 if (error != 0) 3395 return (error); 3396 3397 if (ds->ds_is_snapshot) { 3398 dsl_dataset_rele(ds, FTAG); 3399 return (SET_ERROR(EINVAL)); 3400 } 3401 3402 error = dsl_prop_predict(ds->ds_dir, 3403 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3404 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3405 if (error != 0) { 3406 dsl_dataset_rele(ds, FTAG); 3407 return (error); 3408 } 3409 3410 /* 3411 * If we are doing the preliminary check in open context, the 3412 * space estimates may be inaccurate. 3413 */ 3414 if (!dmu_tx_is_syncing(tx)) { 3415 dsl_dataset_rele(ds, FTAG); 3416 return (0); 3417 } 3418 3419 mutex_enter(&ds->ds_lock); 3420 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3421 dsl_dataset_recalc_head_uniq(ds); 3422 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3423 mutex_exit(&ds->ds_lock); 3424 3425 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3426 uint64_t delta = MAX(unique, newval) - 3427 MAX(unique, ds->ds_reserved); 3428 3429 if (delta > 3430 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3431 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3432 dsl_dataset_rele(ds, FTAG); 3433 return (SET_ERROR(ENOSPC)); 3434 } 3435 } 3436 3437 dsl_dataset_rele(ds, FTAG); 3438 return (0); 3439} 3440 3441void 3442dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3443 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3444{ 3445 uint64_t newval; 3446 uint64_t unique; 3447 int64_t delta; 3448 3449 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3450 source, sizeof (value), 1, &value, tx); 3451 3452 VERIFY0(dsl_prop_get_int_ds(ds, 3453 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3454 3455 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3456 mutex_enter(&ds->ds_dir->dd_lock); 3457 mutex_enter(&ds->ds_lock); 3458 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3459 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3460 delta = MAX(0, (int64_t)(newval - unique)) - 3461 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3462 ds->ds_reserved = newval; 3463 mutex_exit(&ds->ds_lock); 3464 3465 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3466 mutex_exit(&ds->ds_dir->dd_lock); 3467} 3468 3469static void 3470dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3471{ 3472 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3473 dsl_pool_t *dp = dmu_tx_pool(tx); 3474 dsl_dataset_t *ds; 3475 3476 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3477 dsl_dataset_set_refreservation_sync_impl(ds, 3478 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3479 dsl_dataset_rele(ds, FTAG); 3480} 3481 3482int 3483dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3484 uint64_t refreservation) 3485{ 3486 dsl_dataset_set_qr_arg_t ddsqra; 3487 3488 ddsqra.ddsqra_name = dsname; 3489 ddsqra.ddsqra_source = source; 3490 ddsqra.ddsqra_value = refreservation; 3491 3492 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3493 dsl_dataset_set_refreservation_sync, &ddsqra, 3494 0, ZFS_SPACE_CHECK_NONE)); 3495} 3496 3497/* 3498 * Return (in *usedp) the amount of space written in new that is not 3499 * present in oldsnap. New may be a snapshot or the head. Old must be 3500 * a snapshot before new, in new's filesystem (or its origin). If not then 3501 * fail and return EINVAL. 3502 * 3503 * The written space is calculated by considering two components: First, we 3504 * ignore any freed space, and calculate the written as new's used space 3505 * minus old's used space. Next, we add in the amount of space that was freed 3506 * between the two snapshots, thus reducing new's used space relative to old's. 3507 * Specifically, this is the space that was born before old->ds_creation_txg, 3508 * and freed before new (ie. on new's deadlist or a previous deadlist). 3509 * 3510 * space freed [---------------------] 3511 * snapshots ---O-------O--------O-------O------ 3512 * oldsnap new 3513 */ 3514int 3515dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3516 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3517{ 3518 int err = 0; 3519 uint64_t snapobj; 3520 dsl_pool_t *dp = new->ds_dir->dd_pool; 3521 3522 ASSERT(dsl_pool_config_held(dp)); 3523 3524 *usedp = 0; 3525 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3526 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3527 3528 *compp = 0; 3529 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3530 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3531 3532 *uncompp = 0; 3533 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3534 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3535 3536 snapobj = new->ds_object; 3537 while (snapobj != oldsnap->ds_object) { 3538 dsl_dataset_t *snap; 3539 uint64_t used, comp, uncomp; 3540 3541 if (snapobj == new->ds_object) { 3542 snap = new; 3543 } else { 3544 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3545 if (err != 0) 3546 break; 3547 } 3548 3549 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3550 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3551 /* 3552 * The blocks in the deadlist can not be born after 3553 * ds_prev_snap_txg, so get the whole deadlist space, 3554 * which is more efficient (especially for old-format 3555 * deadlists). Unfortunately the deadlist code 3556 * doesn't have enough information to make this 3557 * optimization itself. 3558 */ 3559 dsl_deadlist_space(&snap->ds_deadlist, 3560 &used, &comp, &uncomp); 3561 } else { 3562 dsl_deadlist_space_range(&snap->ds_deadlist, 3563 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3564 &used, &comp, &uncomp); 3565 } 3566 *usedp += used; 3567 *compp += comp; 3568 *uncompp += uncomp; 3569 3570 /* 3571 * If we get to the beginning of the chain of snapshots 3572 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3573 * was not a snapshot of/before new. 3574 */ 3575 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3576 if (snap != new) 3577 dsl_dataset_rele(snap, FTAG); 3578 if (snapobj == 0) { 3579 err = SET_ERROR(EINVAL); 3580 break; 3581 } 3582 3583 } 3584 return (err); 3585} 3586 3587/* 3588 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3589 * lastsnap, and all snapshots in between are deleted. 3590 * 3591 * blocks that would be freed [---------------------------] 3592 * snapshots ---O-------O--------O-------O--------O 3593 * firstsnap lastsnap 3594 * 3595 * This is the set of blocks that were born after the snap before firstsnap, 3596 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3597 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3598 * We calculate this by iterating over the relevant deadlists (from the snap 3599 * after lastsnap, backward to the snap after firstsnap), summing up the 3600 * space on the deadlist that was born after the snap before firstsnap. 3601 */ 3602int 3603dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3604 dsl_dataset_t *lastsnap, 3605 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3606{ 3607 int err = 0; 3608 uint64_t snapobj; 3609 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3610 3611 ASSERT(firstsnap->ds_is_snapshot); 3612 ASSERT(lastsnap->ds_is_snapshot); 3613 3614 /* 3615 * Check that the snapshots are in the same dsl_dir, and firstsnap 3616 * is before lastsnap. 3617 */ 3618 if (firstsnap->ds_dir != lastsnap->ds_dir || 3619 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3620 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3621 return (SET_ERROR(EINVAL)); 3622 3623 *usedp = *compp = *uncompp = 0; 3624 3625 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3626 while (snapobj != firstsnap->ds_object) { 3627 dsl_dataset_t *ds; 3628 uint64_t used, comp, uncomp; 3629 3630 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3631 if (err != 0) 3632 break; 3633 3634 dsl_deadlist_space_range(&ds->ds_deadlist, 3635 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3636 &used, &comp, &uncomp); 3637 *usedp += used; 3638 *compp += comp; 3639 *uncompp += uncomp; 3640 3641 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3642 ASSERT3U(snapobj, !=, 0); 3643 dsl_dataset_rele(ds, FTAG); 3644 } 3645 return (err); 3646} 3647 3648/* 3649 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3650 * For example, they could both be snapshots of the same filesystem, and 3651 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3652 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3653 * filesystem. Or 'earlier' could be the origin's origin. 3654 * 3655 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3656 */ 3657boolean_t 3658dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3659 uint64_t earlier_txg) 3660{ 3661 dsl_pool_t *dp = later->ds_dir->dd_pool; 3662 int error; 3663 boolean_t ret; 3664 3665 ASSERT(dsl_pool_config_held(dp)); 3666 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3667 3668 if (earlier_txg == 0) 3669 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3670 3671 if (later->ds_is_snapshot && 3672 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3673 return (B_FALSE); 3674 3675 if (later->ds_dir == earlier->ds_dir) 3676 return (B_TRUE); 3677 if (!dsl_dir_is_clone(later->ds_dir)) 3678 return (B_FALSE); 3679 3680 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3681 return (B_TRUE); 3682 dsl_dataset_t *origin; 3683 error = dsl_dataset_hold_obj(dp, 3684 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3685 if (error != 0) 3686 return (B_FALSE); 3687 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3688 dsl_dataset_rele(origin, FTAG); 3689 return (ret); 3690} 3691 3692void 3693dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3694{ 3695 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3696 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3697} 3698 3699boolean_t 3700dsl_dataset_is_zapified(dsl_dataset_t *ds) 3701{ 3702 dmu_object_info_t doi; 3703 3704 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3705 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3706} 3707 3708boolean_t 3709dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3710{ 3711 return (dsl_dataset_is_zapified(ds) && 3712 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3713 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3714} 3715