dsl_dataset.c revision 307282
1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21/* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Portions Copyright (c) 2011 Martin Matuska <mm@FreeBSD.org> 24 * Copyright (c) 2011, 2015 by Delphix. All rights reserved. 25 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2014 RackTop Systems. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright (c) 2014 Integros [integros.com] 29 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. 30 */ 31 32#include <sys/dmu_objset.h> 33#include <sys/dsl_dataset.h> 34#include <sys/dsl_dir.h> 35#include <sys/dsl_prop.h> 36#include <sys/dsl_synctask.h> 37#include <sys/dmu_traverse.h> 38#include <sys/dmu_impl.h> 39#include <sys/dmu_send.h> 40#include <sys/dmu_tx.h> 41#include <sys/arc.h> 42#include <sys/zio.h> 43#include <sys/zap.h> 44#include <sys/zfeature.h> 45#include <sys/unique.h> 46#include <sys/zfs_context.h> 47#include <sys/zfs_ioctl.h> 48#include <sys/spa.h> 49#include <sys/zfs_znode.h> 50#include <sys/zfs_onexit.h> 51#include <sys/zvol.h> 52#include <sys/dsl_scan.h> 53#include <sys/dsl_deadlist.h> 54#include <sys/dsl_destroy.h> 55#include <sys/dsl_userhold.h> 56#include <sys/dsl_bookmark.h> 57#include <sys/dmu_send.h> 58#include <sys/zio_checksum.h> 59#include <sys/zio_compress.h> 60#include <zfs_fletcher.h> 61 62SYSCTL_DECL(_vfs_zfs); 63 64/* 65 * The SPA supports block sizes up to 16MB. However, very large blocks 66 * can have an impact on i/o latency (e.g. tying up a spinning disk for 67 * ~300ms), and also potentially on the memory allocator. Therefore, 68 * we do not allow the recordsize to be set larger than zfs_max_recordsize 69 * (default 1MB). Larger blocks can be created by changing this tunable, 70 * and pools with larger blocks can always be imported and used, regardless 71 * of this setting. 72 */ 73int zfs_max_recordsize = 1 * 1024 * 1024; 74SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 75 &zfs_max_recordsize, 0, 76 "Maximum block size. Expect dragons when tuning this."); 77 78#define SWITCH64(x, y) \ 79 { \ 80 uint64_t __tmp = (x); \ 81 (x) = (y); \ 82 (y) = __tmp; \ 83 } 84 85#define DS_REF_MAX (1ULL << 62) 86 87extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 88 89extern int spa_asize_inflation; 90 91/* 92 * Figure out how much of this delta should be propogated to the dsl_dir 93 * layer. If there's a refreservation, that space has already been 94 * partially accounted for in our ancestors. 95 */ 96static int64_t 97parent_delta(dsl_dataset_t *ds, int64_t delta) 98{ 99 dsl_dataset_phys_t *ds_phys; 100 uint64_t old_bytes, new_bytes; 101 102 if (ds->ds_reserved == 0) 103 return (delta); 104 105 ds_phys = dsl_dataset_phys(ds); 106 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 107 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 108 109 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 110 return (new_bytes - old_bytes); 111} 112 113void 114dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 115{ 116 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 117 int compressed = BP_GET_PSIZE(bp); 118 int uncompressed = BP_GET_UCSIZE(bp); 119 int64_t delta; 120 121 dprintf_bp(bp, "ds=%p", ds); 122 123 ASSERT(dmu_tx_is_syncing(tx)); 124 /* It could have been compressed away to nothing */ 125 if (BP_IS_HOLE(bp)) 126 return; 127 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 128 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 129 if (ds == NULL) { 130 dsl_pool_mos_diduse_space(tx->tx_pool, 131 used, compressed, uncompressed); 132 return; 133 } 134 135 dmu_buf_will_dirty(ds->ds_dbuf, tx); 136 mutex_enter(&ds->ds_lock); 137 delta = parent_delta(ds, used); 138 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 139 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 140 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 141 dsl_dataset_phys(ds)->ds_unique_bytes += used; 142 143 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 144 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 145 B_TRUE; 146 } 147 148 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 149 if (f != SPA_FEATURE_NONE) 150 ds->ds_feature_activation_needed[f] = B_TRUE; 151 152 mutex_exit(&ds->ds_lock); 153 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 154 compressed, uncompressed, tx); 155 dsl_dir_transfer_space(ds->ds_dir, used - delta, 156 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 157} 158 159int 160dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 161 boolean_t async) 162{ 163 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 164 int compressed = BP_GET_PSIZE(bp); 165 int uncompressed = BP_GET_UCSIZE(bp); 166 167 if (BP_IS_HOLE(bp)) 168 return (0); 169 170 ASSERT(dmu_tx_is_syncing(tx)); 171 ASSERT(bp->blk_birth <= tx->tx_txg); 172 173 if (ds == NULL) { 174 dsl_free(tx->tx_pool, tx->tx_txg, bp); 175 dsl_pool_mos_diduse_space(tx->tx_pool, 176 -used, -compressed, -uncompressed); 177 return (used); 178 } 179 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 180 181 ASSERT(!ds->ds_is_snapshot); 182 dmu_buf_will_dirty(ds->ds_dbuf, tx); 183 184 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 185 int64_t delta; 186 187 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 188 dsl_free(tx->tx_pool, tx->tx_txg, bp); 189 190 mutex_enter(&ds->ds_lock); 191 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 192 !DS_UNIQUE_IS_ACCURATE(ds)); 193 delta = parent_delta(ds, -used); 194 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 195 mutex_exit(&ds->ds_lock); 196 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 197 delta, -compressed, -uncompressed, tx); 198 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 199 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 200 } else { 201 dprintf_bp(bp, "putting on dead list: %s", ""); 202 if (async) { 203 /* 204 * We are here as part of zio's write done callback, 205 * which means we're a zio interrupt thread. We can't 206 * call dsl_deadlist_insert() now because it may block 207 * waiting for I/O. Instead, put bp on the deferred 208 * queue and let dsl_pool_sync() finish the job. 209 */ 210 bplist_append(&ds->ds_pending_deadlist, bp); 211 } else { 212 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 213 } 214 ASSERT3U(ds->ds_prev->ds_object, ==, 215 dsl_dataset_phys(ds)->ds_prev_snap_obj); 216 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 217 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 218 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 219 ds->ds_object && bp->blk_birth > 220 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 221 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 222 mutex_enter(&ds->ds_prev->ds_lock); 223 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 224 mutex_exit(&ds->ds_prev->ds_lock); 225 } 226 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 227 dsl_dir_transfer_space(ds->ds_dir, used, 228 DD_USED_HEAD, DD_USED_SNAP, tx); 229 } 230 } 231 mutex_enter(&ds->ds_lock); 232 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 233 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 234 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 235 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 236 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 237 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 238 mutex_exit(&ds->ds_lock); 239 240 return (used); 241} 242 243uint64_t 244dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 245{ 246 uint64_t trysnap = 0; 247 248 if (ds == NULL) 249 return (0); 250 /* 251 * The snapshot creation could fail, but that would cause an 252 * incorrect FALSE return, which would only result in an 253 * overestimation of the amount of space that an operation would 254 * consume, which is OK. 255 * 256 * There's also a small window where we could miss a pending 257 * snapshot, because we could set the sync task in the quiescing 258 * phase. So this should only be used as a guess. 259 */ 260 if (ds->ds_trysnap_txg > 261 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 262 trysnap = ds->ds_trysnap_txg; 263 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 264} 265 266boolean_t 267dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 268 uint64_t blk_birth) 269{ 270 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 271 (bp != NULL && BP_IS_HOLE(bp))) 272 return (B_FALSE); 273 274 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 275 276 return (B_TRUE); 277} 278 279static void 280dsl_dataset_evict(void *dbu) 281{ 282 dsl_dataset_t *ds = dbu; 283 284 ASSERT(ds->ds_owner == NULL); 285 286 ds->ds_dbuf = NULL; 287 288 unique_remove(ds->ds_fsid_guid); 289 290 if (ds->ds_objset != NULL) 291 dmu_objset_evict(ds->ds_objset); 292 293 if (ds->ds_prev) { 294 dsl_dataset_rele(ds->ds_prev, ds); 295 ds->ds_prev = NULL; 296 } 297 298 bplist_destroy(&ds->ds_pending_deadlist); 299 if (ds->ds_deadlist.dl_os != NULL) 300 dsl_deadlist_close(&ds->ds_deadlist); 301 if (ds->ds_dir) 302 dsl_dir_async_rele(ds->ds_dir, ds); 303 304 ASSERT(!list_link_active(&ds->ds_synced_link)); 305 306 list_destroy(&ds->ds_prop_cbs); 307 if (mutex_owned(&ds->ds_lock)) 308 mutex_exit(&ds->ds_lock); 309 mutex_destroy(&ds->ds_lock); 310 if (mutex_owned(&ds->ds_opening_lock)) 311 mutex_exit(&ds->ds_opening_lock); 312 mutex_destroy(&ds->ds_opening_lock); 313 mutex_destroy(&ds->ds_sendstream_lock); 314 refcount_destroy(&ds->ds_longholds); 315 316 kmem_free(ds, sizeof (dsl_dataset_t)); 317} 318 319int 320dsl_dataset_get_snapname(dsl_dataset_t *ds) 321{ 322 dsl_dataset_phys_t *headphys; 323 int err; 324 dmu_buf_t *headdbuf; 325 dsl_pool_t *dp = ds->ds_dir->dd_pool; 326 objset_t *mos = dp->dp_meta_objset; 327 328 if (ds->ds_snapname[0]) 329 return (0); 330 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 331 return (0); 332 333 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 334 FTAG, &headdbuf); 335 if (err != 0) 336 return (err); 337 headphys = headdbuf->db_data; 338 err = zap_value_search(dp->dp_meta_objset, 339 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 340 dmu_buf_rele(headdbuf, FTAG); 341 return (err); 342} 343 344int 345dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 346{ 347 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 348 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 349 matchtype_t mt; 350 int err; 351 352 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 353 mt = MT_FIRST; 354 else 355 mt = MT_EXACT; 356 357 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 358 value, mt, NULL, 0, NULL); 359 if (err == ENOTSUP && mt == MT_FIRST) 360 err = zap_lookup(mos, snapobj, name, 8, 1, value); 361 return (err); 362} 363 364int 365dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 366 boolean_t adj_cnt) 367{ 368 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 369 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 370 matchtype_t mt; 371 int err; 372 373 dsl_dir_snap_cmtime_update(ds->ds_dir); 374 375 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 376 mt = MT_FIRST; 377 else 378 mt = MT_EXACT; 379 380 err = zap_remove_norm(mos, snapobj, name, mt, tx); 381 if (err == ENOTSUP && mt == MT_FIRST) 382 err = zap_remove(mos, snapobj, name, tx); 383 384 if (err == 0 && adj_cnt) 385 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 386 DD_FIELD_SNAPSHOT_COUNT, tx); 387 388 return (err); 389} 390 391boolean_t 392dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 393{ 394 dmu_buf_t *dbuf = ds->ds_dbuf; 395 boolean_t result = B_FALSE; 396 397 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 398 ds->ds_object, DMU_BONUS_BLKID, tag)) { 399 400 if (ds == dmu_buf_get_user(dbuf)) 401 result = B_TRUE; 402 else 403 dmu_buf_rele(dbuf, tag); 404 } 405 406 return (result); 407} 408 409int 410dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 411 dsl_dataset_t **dsp) 412{ 413 objset_t *mos = dp->dp_meta_objset; 414 dmu_buf_t *dbuf; 415 dsl_dataset_t *ds; 416 int err; 417 dmu_object_info_t doi; 418 419 ASSERT(dsl_pool_config_held(dp)); 420 421 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 422 if (err != 0) 423 return (err); 424 425 /* Make sure dsobj has the correct object type. */ 426 dmu_object_info_from_db(dbuf, &doi); 427 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 428 dmu_buf_rele(dbuf, tag); 429 return (SET_ERROR(EINVAL)); 430 } 431 432 ds = dmu_buf_get_user(dbuf); 433 if (ds == NULL) { 434 dsl_dataset_t *winner = NULL; 435 436 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 437 ds->ds_dbuf = dbuf; 438 ds->ds_object = dsobj; 439 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 440 441 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 442 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 443 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 444 refcount_create(&ds->ds_longholds); 445 446 bplist_create(&ds->ds_pending_deadlist); 447 dsl_deadlist_open(&ds->ds_deadlist, 448 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 449 450 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 451 offsetof(dmu_sendarg_t, dsa_link)); 452 453 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 454 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 455 456 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 457 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 458 if (!(spa_feature_table[f].fi_flags & 459 ZFEATURE_FLAG_PER_DATASET)) 460 continue; 461 err = zap_contains(mos, dsobj, 462 spa_feature_table[f].fi_guid); 463 if (err == 0) { 464 ds->ds_feature_inuse[f] = B_TRUE; 465 } else { 466 ASSERT3U(err, ==, ENOENT); 467 err = 0; 468 } 469 } 470 } 471 472 err = dsl_dir_hold_obj(dp, 473 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 474 if (err != 0) { 475 mutex_destroy(&ds->ds_lock); 476 mutex_destroy(&ds->ds_opening_lock); 477 mutex_destroy(&ds->ds_sendstream_lock); 478 refcount_destroy(&ds->ds_longholds); 479 bplist_destroy(&ds->ds_pending_deadlist); 480 dsl_deadlist_close(&ds->ds_deadlist); 481 kmem_free(ds, sizeof (dsl_dataset_t)); 482 dmu_buf_rele(dbuf, tag); 483 return (err); 484 } 485 486 if (!ds->ds_is_snapshot) { 487 ds->ds_snapname[0] = '\0'; 488 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 489 err = dsl_dataset_hold_obj(dp, 490 dsl_dataset_phys(ds)->ds_prev_snap_obj, 491 ds, &ds->ds_prev); 492 } 493 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 494 int zaperr = zap_lookup(mos, ds->ds_object, 495 DS_FIELD_BOOKMARK_NAMES, 496 sizeof (ds->ds_bookmarks), 1, 497 &ds->ds_bookmarks); 498 if (zaperr != ENOENT) 499 VERIFY0(zaperr); 500 } 501 } else { 502 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 503 err = dsl_dataset_get_snapname(ds); 504 if (err == 0 && 505 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 506 err = zap_count( 507 ds->ds_dir->dd_pool->dp_meta_objset, 508 dsl_dataset_phys(ds)->ds_userrefs_obj, 509 &ds->ds_userrefs); 510 } 511 } 512 513 if (err == 0 && !ds->ds_is_snapshot) { 514 err = dsl_prop_get_int_ds(ds, 515 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 516 &ds->ds_reserved); 517 if (err == 0) { 518 err = dsl_prop_get_int_ds(ds, 519 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 520 &ds->ds_quota); 521 } 522 } else { 523 ds->ds_reserved = ds->ds_quota = 0; 524 } 525 526 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 527 if (err == 0) 528 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 529 530 if (err != 0 || winner != NULL) { 531 bplist_destroy(&ds->ds_pending_deadlist); 532 dsl_deadlist_close(&ds->ds_deadlist); 533 if (ds->ds_prev) 534 dsl_dataset_rele(ds->ds_prev, ds); 535 dsl_dir_rele(ds->ds_dir, ds); 536 mutex_destroy(&ds->ds_lock); 537 mutex_destroy(&ds->ds_opening_lock); 538 mutex_destroy(&ds->ds_sendstream_lock); 539 refcount_destroy(&ds->ds_longholds); 540 kmem_free(ds, sizeof (dsl_dataset_t)); 541 if (err != 0) { 542 dmu_buf_rele(dbuf, tag); 543 return (err); 544 } 545 ds = winner; 546 } else { 547 ds->ds_fsid_guid = 548 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 549 } 550 } 551 ASSERT3P(ds->ds_dbuf, ==, dbuf); 552 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 553 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 554 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 555 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 556 *dsp = ds; 557 return (0); 558} 559 560int 561dsl_dataset_hold(dsl_pool_t *dp, const char *name, 562 void *tag, dsl_dataset_t **dsp) 563{ 564 dsl_dir_t *dd; 565 const char *snapname; 566 uint64_t obj; 567 int err = 0; 568 dsl_dataset_t *ds; 569 570 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 571 if (err != 0) 572 return (err); 573 574 ASSERT(dsl_pool_config_held(dp)); 575 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 576 if (obj != 0) 577 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 578 else 579 err = SET_ERROR(ENOENT); 580 581 /* we may be looking for a snapshot */ 582 if (err == 0 && snapname != NULL) { 583 dsl_dataset_t *snap_ds; 584 585 if (*snapname++ != '@') { 586 dsl_dataset_rele(ds, tag); 587 dsl_dir_rele(dd, FTAG); 588 return (SET_ERROR(ENOENT)); 589 } 590 591 dprintf("looking for snapshot '%s'\n", snapname); 592 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 593 if (err == 0) 594 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 595 dsl_dataset_rele(ds, tag); 596 597 if (err == 0) { 598 mutex_enter(&snap_ds->ds_lock); 599 if (snap_ds->ds_snapname[0] == 0) 600 (void) strlcpy(snap_ds->ds_snapname, snapname, 601 sizeof (snap_ds->ds_snapname)); 602 mutex_exit(&snap_ds->ds_lock); 603 ds = snap_ds; 604 } 605 } 606 if (err == 0) 607 *dsp = ds; 608 dsl_dir_rele(dd, FTAG); 609 return (err); 610} 611 612int 613dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 614 void *tag, dsl_dataset_t **dsp) 615{ 616 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 617 if (err != 0) 618 return (err); 619 if (!dsl_dataset_tryown(*dsp, tag)) { 620 dsl_dataset_rele(*dsp, tag); 621 *dsp = NULL; 622 return (SET_ERROR(EBUSY)); 623 } 624 return (0); 625} 626 627int 628dsl_dataset_own(dsl_pool_t *dp, const char *name, 629 void *tag, dsl_dataset_t **dsp) 630{ 631 int err = dsl_dataset_hold(dp, name, tag, dsp); 632 if (err != 0) 633 return (err); 634 if (!dsl_dataset_tryown(*dsp, tag)) { 635 dsl_dataset_rele(*dsp, tag); 636 return (SET_ERROR(EBUSY)); 637 } 638 return (0); 639} 640 641/* 642 * See the comment above dsl_pool_hold() for details. In summary, a long 643 * hold is used to prevent destruction of a dataset while the pool hold 644 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 645 * 646 * The dataset and pool must be held when this function is called. After it 647 * is called, the pool hold may be released while the dataset is still held 648 * and accessed. 649 */ 650void 651dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 652{ 653 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 654 (void) refcount_add(&ds->ds_longholds, tag); 655} 656 657void 658dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 659{ 660 (void) refcount_remove(&ds->ds_longholds, tag); 661} 662 663/* Return B_TRUE if there are any long holds on this dataset. */ 664boolean_t 665dsl_dataset_long_held(dsl_dataset_t *ds) 666{ 667 return (!refcount_is_zero(&ds->ds_longholds)); 668} 669 670void 671dsl_dataset_name(dsl_dataset_t *ds, char *name) 672{ 673 if (ds == NULL) { 674 (void) strcpy(name, "mos"); 675 } else { 676 dsl_dir_name(ds->ds_dir, name); 677 VERIFY0(dsl_dataset_get_snapname(ds)); 678 if (ds->ds_snapname[0]) { 679 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 680 <, ZFS_MAX_DATASET_NAME_LEN); 681 /* 682 * We use a "recursive" mutex so that we 683 * can call dprintf_ds() with ds_lock held. 684 */ 685 if (!MUTEX_HELD(&ds->ds_lock)) { 686 mutex_enter(&ds->ds_lock); 687 VERIFY3U(strlcat(name, ds->ds_snapname, 688 ZFS_MAX_DATASET_NAME_LEN), <, 689 ZFS_MAX_DATASET_NAME_LEN); 690 mutex_exit(&ds->ds_lock); 691 } else { 692 VERIFY3U(strlcat(name, ds->ds_snapname, 693 ZFS_MAX_DATASET_NAME_LEN), <, 694 ZFS_MAX_DATASET_NAME_LEN); 695 } 696 } 697 } 698} 699 700int 701dsl_dataset_namelen(dsl_dataset_t *ds) 702{ 703 VERIFY0(dsl_dataset_get_snapname(ds)); 704 mutex_enter(&ds->ds_lock); 705 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 706 mutex_exit(&ds->ds_lock); 707 return (len); 708} 709 710void 711dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 712{ 713 dmu_buf_rele(ds->ds_dbuf, tag); 714} 715 716void 717dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 718{ 719 ASSERT3P(ds->ds_owner, ==, tag); 720 ASSERT(ds->ds_dbuf != NULL); 721 722 mutex_enter(&ds->ds_lock); 723 ds->ds_owner = NULL; 724 mutex_exit(&ds->ds_lock); 725 dsl_dataset_long_rele(ds, tag); 726 dsl_dataset_rele(ds, tag); 727} 728 729boolean_t 730dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 731{ 732 boolean_t gotit = FALSE; 733 734 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 735 mutex_enter(&ds->ds_lock); 736 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 737 ds->ds_owner = tag; 738 dsl_dataset_long_hold(ds, tag); 739 gotit = TRUE; 740 } 741 mutex_exit(&ds->ds_lock); 742 return (gotit); 743} 744 745boolean_t 746dsl_dataset_has_owner(dsl_dataset_t *ds) 747{ 748 boolean_t rv; 749 mutex_enter(&ds->ds_lock); 750 rv = (ds->ds_owner != NULL); 751 mutex_exit(&ds->ds_lock); 752 return (rv); 753} 754 755static void 756dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 757{ 758 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 759 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 760 uint64_t zero = 0; 761 762 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 763 764 spa_feature_incr(spa, f, tx); 765 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 766 767 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 768 sizeof (zero), 1, &zero, tx)); 769} 770 771void 772dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 773{ 774 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 775 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 776 777 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 778 779 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 780 spa_feature_decr(spa, f, tx); 781} 782 783uint64_t 784dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 785 uint64_t flags, dmu_tx_t *tx) 786{ 787 dsl_pool_t *dp = dd->dd_pool; 788 dmu_buf_t *dbuf; 789 dsl_dataset_phys_t *dsphys; 790 uint64_t dsobj; 791 objset_t *mos = dp->dp_meta_objset; 792 793 if (origin == NULL) 794 origin = dp->dp_origin_snap; 795 796 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 797 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 798 ASSERT(dmu_tx_is_syncing(tx)); 799 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 800 801 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 802 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 803 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 804 dmu_buf_will_dirty(dbuf, tx); 805 dsphys = dbuf->db_data; 806 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 807 dsphys->ds_dir_obj = dd->dd_object; 808 dsphys->ds_flags = flags; 809 dsphys->ds_fsid_guid = unique_create(); 810 do { 811 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 812 sizeof (dsphys->ds_guid)); 813 } while (dsphys->ds_guid == 0); 814 dsphys->ds_snapnames_zapobj = 815 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 816 DMU_OT_NONE, 0, tx); 817 dsphys->ds_creation_time = gethrestime_sec(); 818 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 819 820 if (origin == NULL) { 821 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 822 } else { 823 dsl_dataset_t *ohds; /* head of the origin snapshot */ 824 825 dsphys->ds_prev_snap_obj = origin->ds_object; 826 dsphys->ds_prev_snap_txg = 827 dsl_dataset_phys(origin)->ds_creation_txg; 828 dsphys->ds_referenced_bytes = 829 dsl_dataset_phys(origin)->ds_referenced_bytes; 830 dsphys->ds_compressed_bytes = 831 dsl_dataset_phys(origin)->ds_compressed_bytes; 832 dsphys->ds_uncompressed_bytes = 833 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 834 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 835 836 /* 837 * Inherit flags that describe the dataset's contents 838 * (INCONSISTENT) or properties (Case Insensitive). 839 */ 840 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 841 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 842 843 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 844 if (origin->ds_feature_inuse[f]) 845 dsl_dataset_activate_feature(dsobj, f, tx); 846 } 847 848 dmu_buf_will_dirty(origin->ds_dbuf, tx); 849 dsl_dataset_phys(origin)->ds_num_children++; 850 851 VERIFY0(dsl_dataset_hold_obj(dp, 852 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 853 FTAG, &ohds)); 854 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 855 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 856 dsl_dataset_rele(ohds, FTAG); 857 858 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 859 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 860 dsl_dataset_phys(origin)->ds_next_clones_obj = 861 zap_create(mos, 862 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 863 } 864 VERIFY0(zap_add_int(mos, 865 dsl_dataset_phys(origin)->ds_next_clones_obj, 866 dsobj, tx)); 867 } 868 869 dmu_buf_will_dirty(dd->dd_dbuf, tx); 870 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 871 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 872 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 873 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 874 dsl_dir_phys(origin->ds_dir)->dd_clones = 875 zap_create(mos, 876 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 877 } 878 VERIFY0(zap_add_int(mos, 879 dsl_dir_phys(origin->ds_dir)->dd_clones, 880 dsobj, tx)); 881 } 882 } 883 884 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 885 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 886 887 dmu_buf_rele(dbuf, FTAG); 888 889 dmu_buf_will_dirty(dd->dd_dbuf, tx); 890 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 891 892 return (dsobj); 893} 894 895static void 896dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 897{ 898 objset_t *os; 899 900 VERIFY0(dmu_objset_from_ds(ds, &os)); 901 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 902 dsl_dataset_dirty(ds, tx); 903} 904 905uint64_t 906dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 907 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 908{ 909 dsl_pool_t *dp = pdd->dd_pool; 910 uint64_t dsobj, ddobj; 911 dsl_dir_t *dd; 912 913 ASSERT(dmu_tx_is_syncing(tx)); 914 ASSERT(lastname[0] != '@'); 915 916 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 917 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 918 919 dsobj = dsl_dataset_create_sync_dd(dd, origin, 920 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 921 922 dsl_deleg_set_create_perms(dd, tx, cr); 923 924 /* 925 * Since we're creating a new node we know it's a leaf, so we can 926 * initialize the counts if the limit feature is active. 927 */ 928 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 929 uint64_t cnt = 0; 930 objset_t *os = dd->dd_pool->dp_meta_objset; 931 932 dsl_dir_zapify(dd, tx); 933 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 934 sizeof (cnt), 1, &cnt, tx)); 935 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 936 sizeof (cnt), 1, &cnt, tx)); 937 } 938 939 dsl_dir_rele(dd, FTAG); 940 941 /* 942 * If we are creating a clone, make sure we zero out any stale 943 * data from the origin snapshots zil header. 944 */ 945 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 946 dsl_dataset_t *ds; 947 948 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 949 dsl_dataset_zero_zil(ds, tx); 950 dsl_dataset_rele(ds, FTAG); 951 } 952 953 return (dsobj); 954} 955 956#ifdef __FreeBSD__ 957/* FreeBSD ioctl compat begin */ 958struct destroyarg { 959 nvlist_t *nvl; 960 const char *snapname; 961}; 962 963static int 964dsl_check_snap_cb(const char *name, void *arg) 965{ 966 struct destroyarg *da = arg; 967 dsl_dataset_t *ds; 968 char *dsname; 969 970 dsname = kmem_asprintf("%s@%s", name, da->snapname); 971 fnvlist_add_boolean(da->nvl, dsname); 972 kmem_free(dsname, strlen(dsname) + 1); 973 974 return (0); 975} 976 977int 978dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 979 nvlist_t *snaps) 980{ 981 struct destroyarg *da; 982 int err; 983 984 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 985 da->nvl = snaps; 986 da->snapname = snapname; 987 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 988 DS_FIND_CHILDREN); 989 kmem_free(da, sizeof (struct destroyarg)); 990 991 return (err); 992} 993/* FreeBSD ioctl compat end */ 994#endif /* __FreeBSD__ */ 995 996/* 997 * The unique space in the head dataset can be calculated by subtracting 998 * the space used in the most recent snapshot, that is still being used 999 * in this file system, from the space currently in use. To figure out 1000 * the space in the most recent snapshot still in use, we need to take 1001 * the total space used in the snapshot and subtract out the space that 1002 * has been freed up since the snapshot was taken. 1003 */ 1004void 1005dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1006{ 1007 uint64_t mrs_used; 1008 uint64_t dlused, dlcomp, dluncomp; 1009 1010 ASSERT(!ds->ds_is_snapshot); 1011 1012 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 1013 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 1014 else 1015 mrs_used = 0; 1016 1017 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1018 1019 ASSERT3U(dlused, <=, mrs_used); 1020 dsl_dataset_phys(ds)->ds_unique_bytes = 1021 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1022 1023 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1024 SPA_VERSION_UNIQUE_ACCURATE) 1025 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1026} 1027 1028void 1029dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1030 dmu_tx_t *tx) 1031{ 1032 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1033 uint64_t count; 1034 int err; 1035 1036 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1037 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1038 obj, tx); 1039 /* 1040 * The err should not be ENOENT, but a bug in a previous version 1041 * of the code could cause upgrade_clones_cb() to not set 1042 * ds_next_snap_obj when it should, leading to a missing entry. 1043 * If we knew that the pool was created after 1044 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1045 * ENOENT. However, at least we can check that we don't have 1046 * too many entries in the next_clones_obj even after failing to 1047 * remove this one. 1048 */ 1049 if (err != ENOENT) 1050 VERIFY0(err); 1051 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1052 &count)); 1053 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1054} 1055 1056 1057blkptr_t * 1058dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1059{ 1060 return (&dsl_dataset_phys(ds)->ds_bp); 1061} 1062 1063spa_t * 1064dsl_dataset_get_spa(dsl_dataset_t *ds) 1065{ 1066 return (ds->ds_dir->dd_pool->dp_spa); 1067} 1068 1069void 1070dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1071{ 1072 dsl_pool_t *dp; 1073 1074 if (ds == NULL) /* this is the meta-objset */ 1075 return; 1076 1077 ASSERT(ds->ds_objset != NULL); 1078 1079 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1080 panic("dirtying snapshot!"); 1081 1082 dp = ds->ds_dir->dd_pool; 1083 1084 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1085 /* up the hold count until we can be written out */ 1086 dmu_buf_add_ref(ds->ds_dbuf, ds); 1087 } 1088} 1089 1090boolean_t 1091dsl_dataset_is_dirty(dsl_dataset_t *ds) 1092{ 1093 for (int t = 0; t < TXG_SIZE; t++) { 1094 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1095 ds, t)) 1096 return (B_TRUE); 1097 } 1098 return (B_FALSE); 1099} 1100 1101static int 1102dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1103{ 1104 uint64_t asize; 1105 1106 if (!dmu_tx_is_syncing(tx)) 1107 return (0); 1108 1109 /* 1110 * If there's an fs-only reservation, any blocks that might become 1111 * owned by the snapshot dataset must be accommodated by space 1112 * outside of the reservation. 1113 */ 1114 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1115 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1116 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1117 return (SET_ERROR(ENOSPC)); 1118 1119 /* 1120 * Propagate any reserved space for this snapshot to other 1121 * snapshot checks in this sync group. 1122 */ 1123 if (asize > 0) 1124 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1125 1126 return (0); 1127} 1128 1129typedef struct dsl_dataset_snapshot_arg { 1130 nvlist_t *ddsa_snaps; 1131 nvlist_t *ddsa_props; 1132 nvlist_t *ddsa_errors; 1133 cred_t *ddsa_cr; 1134} dsl_dataset_snapshot_arg_t; 1135 1136int 1137dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1138 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1139{ 1140 int error; 1141 uint64_t value; 1142 1143 ds->ds_trysnap_txg = tx->tx_txg; 1144 1145 if (!dmu_tx_is_syncing(tx)) 1146 return (0); 1147 1148 /* 1149 * We don't allow multiple snapshots of the same txg. If there 1150 * is already one, try again. 1151 */ 1152 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1153 return (SET_ERROR(EAGAIN)); 1154 1155 /* 1156 * Check for conflicting snapshot name. 1157 */ 1158 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1159 if (error == 0) 1160 return (SET_ERROR(EEXIST)); 1161 if (error != ENOENT) 1162 return (error); 1163 1164 /* 1165 * We don't allow taking snapshots of inconsistent datasets, such as 1166 * those into which we are currently receiving. However, if we are 1167 * creating this snapshot as part of a receive, this check will be 1168 * executed atomically with respect to the completion of the receive 1169 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1170 * case we ignore this, knowing it will be fixed up for us shortly in 1171 * dmu_recv_end_sync(). 1172 */ 1173 if (!recv && DS_IS_INCONSISTENT(ds)) 1174 return (SET_ERROR(EBUSY)); 1175 1176 /* 1177 * Skip the check for temporary snapshots or if we have already checked 1178 * the counts in dsl_dataset_snapshot_check. This means we really only 1179 * check the count here when we're receiving a stream. 1180 */ 1181 if (cnt != 0 && cr != NULL) { 1182 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1183 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1184 if (error != 0) 1185 return (error); 1186 } 1187 1188 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1189 if (error != 0) 1190 return (error); 1191 1192 return (0); 1193} 1194 1195static int 1196dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1197{ 1198 dsl_dataset_snapshot_arg_t *ddsa = arg; 1199 dsl_pool_t *dp = dmu_tx_pool(tx); 1200 nvpair_t *pair; 1201 int rv = 0; 1202 1203 /* 1204 * Pre-compute how many total new snapshots will be created for each 1205 * level in the tree and below. This is needed for validating the 1206 * snapshot limit when either taking a recursive snapshot or when 1207 * taking multiple snapshots. 1208 * 1209 * The problem is that the counts are not actually adjusted when 1210 * we are checking, only when we finally sync. For a single snapshot, 1211 * this is easy, the count will increase by 1 at each node up the tree, 1212 * but its more complicated for the recursive/multiple snapshot case. 1213 * 1214 * The dsl_fs_ss_limit_check function does recursively check the count 1215 * at each level up the tree but since it is validating each snapshot 1216 * independently we need to be sure that we are validating the complete 1217 * count for the entire set of snapshots. We do this by rolling up the 1218 * counts for each component of the name into an nvlist and then 1219 * checking each of those cases with the aggregated count. 1220 * 1221 * This approach properly handles not only the recursive snapshot 1222 * case (where we get all of those on the ddsa_snaps list) but also 1223 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1224 * validate the limit on 'a' using a count of 2). 1225 * 1226 * We validate the snapshot names in the third loop and only report 1227 * name errors once. 1228 */ 1229 if (dmu_tx_is_syncing(tx)) { 1230 nvlist_t *cnt_track = NULL; 1231 cnt_track = fnvlist_alloc(); 1232 1233 /* Rollup aggregated counts into the cnt_track list */ 1234 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1235 pair != NULL; 1236 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1237 char *pdelim; 1238 uint64_t val; 1239 char nm[MAXPATHLEN]; 1240 1241 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1242 pdelim = strchr(nm, '@'); 1243 if (pdelim == NULL) 1244 continue; 1245 *pdelim = '\0'; 1246 1247 do { 1248 if (nvlist_lookup_uint64(cnt_track, nm, 1249 &val) == 0) { 1250 /* update existing entry */ 1251 fnvlist_add_uint64(cnt_track, nm, 1252 val + 1); 1253 } else { 1254 /* add to list */ 1255 fnvlist_add_uint64(cnt_track, nm, 1); 1256 } 1257 1258 pdelim = strrchr(nm, '/'); 1259 if (pdelim != NULL) 1260 *pdelim = '\0'; 1261 } while (pdelim != NULL); 1262 } 1263 1264 /* Check aggregated counts at each level */ 1265 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1266 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1267 int error = 0; 1268 char *name; 1269 uint64_t cnt = 0; 1270 dsl_dataset_t *ds; 1271 1272 name = nvpair_name(pair); 1273 cnt = fnvpair_value_uint64(pair); 1274 ASSERT(cnt > 0); 1275 1276 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1277 if (error == 0) { 1278 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1279 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1280 ddsa->ddsa_cr); 1281 dsl_dataset_rele(ds, FTAG); 1282 } 1283 1284 if (error != 0) { 1285 if (ddsa->ddsa_errors != NULL) 1286 fnvlist_add_int32(ddsa->ddsa_errors, 1287 name, error); 1288 rv = error; 1289 /* only report one error for this check */ 1290 break; 1291 } 1292 } 1293 nvlist_free(cnt_track); 1294 } 1295 1296 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1297 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1298 int error = 0; 1299 dsl_dataset_t *ds; 1300 char *name, *atp; 1301 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1302 1303 name = nvpair_name(pair); 1304 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1305 error = SET_ERROR(ENAMETOOLONG); 1306 if (error == 0) { 1307 atp = strchr(name, '@'); 1308 if (atp == NULL) 1309 error = SET_ERROR(EINVAL); 1310 if (error == 0) 1311 (void) strlcpy(dsname, name, atp - name + 1); 1312 } 1313 if (error == 0) 1314 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1315 if (error == 0) { 1316 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1317 error = dsl_dataset_snapshot_check_impl(ds, 1318 atp + 1, tx, B_FALSE, 0, NULL); 1319 dsl_dataset_rele(ds, FTAG); 1320 } 1321 1322 if (error != 0) { 1323 if (ddsa->ddsa_errors != NULL) { 1324 fnvlist_add_int32(ddsa->ddsa_errors, 1325 name, error); 1326 } 1327 rv = error; 1328 } 1329 } 1330 1331 return (rv); 1332} 1333 1334void 1335dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1336 dmu_tx_t *tx) 1337{ 1338 static zil_header_t zero_zil; 1339 1340 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1341 dmu_buf_t *dbuf; 1342 dsl_dataset_phys_t *dsphys; 1343 uint64_t dsobj, crtxg; 1344 objset_t *mos = dp->dp_meta_objset; 1345 objset_t *os; 1346 1347 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1348 1349 /* 1350 * If we are on an old pool, the zil must not be active, in which 1351 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1352 */ 1353 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1354 dmu_objset_from_ds(ds, &os) != 0 || 1355 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1356 sizeof (zero_zil)) == 0); 1357 1358 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1359 1360 /* 1361 * The origin's ds_creation_txg has to be < TXG_INITIAL 1362 */ 1363 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1364 crtxg = 1; 1365 else 1366 crtxg = tx->tx_txg; 1367 1368 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1369 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1370 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1371 dmu_buf_will_dirty(dbuf, tx); 1372 dsphys = dbuf->db_data; 1373 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1374 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1375 dsphys->ds_fsid_guid = unique_create(); 1376 do { 1377 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1378 sizeof (dsphys->ds_guid)); 1379 } while (dsphys->ds_guid == 0); 1380 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1381 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1382 dsphys->ds_next_snap_obj = ds->ds_object; 1383 dsphys->ds_num_children = 1; 1384 dsphys->ds_creation_time = gethrestime_sec(); 1385 dsphys->ds_creation_txg = crtxg; 1386 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1387 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1388 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1389 dsphys->ds_uncompressed_bytes = 1390 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1391 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1392 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1393 dmu_buf_rele(dbuf, FTAG); 1394 1395 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1396 if (ds->ds_feature_inuse[f]) 1397 dsl_dataset_activate_feature(dsobj, f, tx); 1398 } 1399 1400 ASSERT3U(ds->ds_prev != 0, ==, 1401 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1402 if (ds->ds_prev) { 1403 uint64_t next_clones_obj = 1404 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1405 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1406 ds->ds_object || 1407 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1408 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1409 ds->ds_object) { 1410 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1411 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1412 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1413 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1414 } else if (next_clones_obj != 0) { 1415 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1416 dsphys->ds_next_snap_obj, tx); 1417 VERIFY0(zap_add_int(mos, 1418 next_clones_obj, dsobj, tx)); 1419 } 1420 } 1421 1422 /* 1423 * If we have a reference-reservation on this dataset, we will 1424 * need to increase the amount of refreservation being charged 1425 * since our unique space is going to zero. 1426 */ 1427 if (ds->ds_reserved) { 1428 int64_t delta; 1429 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1430 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1431 ds->ds_reserved); 1432 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1433 delta, 0, 0, tx); 1434 } 1435 1436 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1437 dsl_dataset_phys(ds)->ds_deadlist_obj = 1438 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1439 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1440 dsl_deadlist_close(&ds->ds_deadlist); 1441 dsl_deadlist_open(&ds->ds_deadlist, mos, 1442 dsl_dataset_phys(ds)->ds_deadlist_obj); 1443 dsl_deadlist_add_key(&ds->ds_deadlist, 1444 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1445 1446 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1447 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1448 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1449 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1450 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1451 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1452 1453 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1454 snapname, 8, 1, &dsobj, tx)); 1455 1456 if (ds->ds_prev) 1457 dsl_dataset_rele(ds->ds_prev, ds); 1458 VERIFY0(dsl_dataset_hold_obj(dp, 1459 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1460 1461 dsl_scan_ds_snapshotted(ds, tx); 1462 1463 dsl_dir_snap_cmtime_update(ds->ds_dir); 1464 1465 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1466} 1467 1468static void 1469dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1470{ 1471 dsl_dataset_snapshot_arg_t *ddsa = arg; 1472 dsl_pool_t *dp = dmu_tx_pool(tx); 1473 nvpair_t *pair; 1474 1475 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1476 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1477 dsl_dataset_t *ds; 1478 char *name, *atp; 1479 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1480 1481 name = nvpair_name(pair); 1482 atp = strchr(name, '@'); 1483 (void) strlcpy(dsname, name, atp - name + 1); 1484 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1485 1486 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1487 if (ddsa->ddsa_props != NULL) { 1488 dsl_props_set_sync_impl(ds->ds_prev, 1489 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1490 } 1491 dsl_dataset_rele(ds, FTAG); 1492 } 1493} 1494 1495/* 1496 * The snapshots must all be in the same pool. 1497 * All-or-nothing: if there are any failures, nothing will be modified. 1498 */ 1499int 1500dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1501{ 1502 dsl_dataset_snapshot_arg_t ddsa; 1503 nvpair_t *pair; 1504 boolean_t needsuspend; 1505 int error; 1506 spa_t *spa; 1507 char *firstname; 1508 nvlist_t *suspended = NULL; 1509 1510 pair = nvlist_next_nvpair(snaps, NULL); 1511 if (pair == NULL) 1512 return (0); 1513 firstname = nvpair_name(pair); 1514 1515 error = spa_open(firstname, &spa, FTAG); 1516 if (error != 0) 1517 return (error); 1518 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1519 spa_close(spa, FTAG); 1520 1521 if (needsuspend) { 1522 suspended = fnvlist_alloc(); 1523 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1524 pair = nvlist_next_nvpair(snaps, pair)) { 1525 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1526 char *snapname = nvpair_name(pair); 1527 char *atp; 1528 void *cookie; 1529 1530 atp = strchr(snapname, '@'); 1531 if (atp == NULL) { 1532 error = SET_ERROR(EINVAL); 1533 break; 1534 } 1535 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1536 1537 error = zil_suspend(fsname, &cookie); 1538 if (error != 0) 1539 break; 1540 fnvlist_add_uint64(suspended, fsname, 1541 (uintptr_t)cookie); 1542 } 1543 } 1544 1545 ddsa.ddsa_snaps = snaps; 1546 ddsa.ddsa_props = props; 1547 ddsa.ddsa_errors = errors; 1548 ddsa.ddsa_cr = CRED(); 1549 1550 if (error == 0) { 1551 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1552 dsl_dataset_snapshot_sync, &ddsa, 1553 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1554 } 1555 1556 if (suspended != NULL) { 1557 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1558 pair = nvlist_next_nvpair(suspended, pair)) { 1559 zil_resume((void *)(uintptr_t) 1560 fnvpair_value_uint64(pair)); 1561 } 1562 fnvlist_free(suspended); 1563 } 1564 1565#ifdef __FreeBSD__ 1566#ifdef _KERNEL 1567 if (error == 0) { 1568 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1569 pair = nvlist_next_nvpair(snaps, pair)) { 1570 char *snapname = nvpair_name(pair); 1571 zvol_create_minors(snapname); 1572 } 1573 } 1574#endif 1575#endif 1576 return (error); 1577} 1578 1579typedef struct dsl_dataset_snapshot_tmp_arg { 1580 const char *ddsta_fsname; 1581 const char *ddsta_snapname; 1582 minor_t ddsta_cleanup_minor; 1583 const char *ddsta_htag; 1584} dsl_dataset_snapshot_tmp_arg_t; 1585 1586static int 1587dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1588{ 1589 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1590 dsl_pool_t *dp = dmu_tx_pool(tx); 1591 dsl_dataset_t *ds; 1592 int error; 1593 1594 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1595 if (error != 0) 1596 return (error); 1597 1598 /* NULL cred means no limit check for tmp snapshot */ 1599 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1600 tx, B_FALSE, 0, NULL); 1601 if (error != 0) { 1602 dsl_dataset_rele(ds, FTAG); 1603 return (error); 1604 } 1605 1606 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1607 dsl_dataset_rele(ds, FTAG); 1608 return (SET_ERROR(ENOTSUP)); 1609 } 1610 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1611 B_TRUE, tx); 1612 if (error != 0) { 1613 dsl_dataset_rele(ds, FTAG); 1614 return (error); 1615 } 1616 1617 dsl_dataset_rele(ds, FTAG); 1618 return (0); 1619} 1620 1621static void 1622dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1623{ 1624 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1625 dsl_pool_t *dp = dmu_tx_pool(tx); 1626 dsl_dataset_t *ds; 1627 1628 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1629 1630 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1631 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1632 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1633 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1634 1635 dsl_dataset_rele(ds, FTAG); 1636} 1637 1638int 1639dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1640 minor_t cleanup_minor, const char *htag) 1641{ 1642 dsl_dataset_snapshot_tmp_arg_t ddsta; 1643 int error; 1644 spa_t *spa; 1645 boolean_t needsuspend; 1646 void *cookie; 1647 1648 ddsta.ddsta_fsname = fsname; 1649 ddsta.ddsta_snapname = snapname; 1650 ddsta.ddsta_cleanup_minor = cleanup_minor; 1651 ddsta.ddsta_htag = htag; 1652 1653 error = spa_open(fsname, &spa, FTAG); 1654 if (error != 0) 1655 return (error); 1656 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1657 spa_close(spa, FTAG); 1658 1659 if (needsuspend) { 1660 error = zil_suspend(fsname, &cookie); 1661 if (error != 0) 1662 return (error); 1663 } 1664 1665 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1666 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1667 1668 if (needsuspend) 1669 zil_resume(cookie); 1670 return (error); 1671} 1672 1673 1674void 1675dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1676{ 1677 ASSERT(dmu_tx_is_syncing(tx)); 1678 ASSERT(ds->ds_objset != NULL); 1679 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1680 1681 /* 1682 * in case we had to change ds_fsid_guid when we opened it, 1683 * sync it out now. 1684 */ 1685 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1686 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1687 1688 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1689 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1690 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1691 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1692 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1693 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1694 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1695 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1696 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1697 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1698 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1699 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1700 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1701 } 1702 1703 dmu_objset_sync(ds->ds_objset, zio, tx); 1704 1705 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1706 if (ds->ds_feature_activation_needed[f]) { 1707 if (ds->ds_feature_inuse[f]) 1708 continue; 1709 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1710 ds->ds_feature_inuse[f] = B_TRUE; 1711 } 1712 } 1713} 1714 1715static void 1716get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1717{ 1718 uint64_t count = 0; 1719 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1720 zap_cursor_t zc; 1721 zap_attribute_t za; 1722 nvlist_t *propval = fnvlist_alloc(); 1723 nvlist_t *val = fnvlist_alloc(); 1724 1725 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1726 1727 /* 1728 * There may be missing entries in ds_next_clones_obj 1729 * due to a bug in a previous version of the code. 1730 * Only trust it if it has the right number of entries. 1731 */ 1732 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1733 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1734 &count)); 1735 } 1736 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1737 goto fail; 1738 for (zap_cursor_init(&zc, mos, 1739 dsl_dataset_phys(ds)->ds_next_clones_obj); 1740 zap_cursor_retrieve(&zc, &za) == 0; 1741 zap_cursor_advance(&zc)) { 1742 dsl_dataset_t *clone; 1743 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1744 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1745 za.za_first_integer, FTAG, &clone)); 1746 dsl_dir_name(clone->ds_dir, buf); 1747 fnvlist_add_boolean(val, buf); 1748 dsl_dataset_rele(clone, FTAG); 1749 } 1750 zap_cursor_fini(&zc); 1751 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1752 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1753fail: 1754 nvlist_free(val); 1755 nvlist_free(propval); 1756} 1757 1758static void 1759get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1760{ 1761 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1762 1763 if (dsl_dataset_has_resume_receive_state(ds)) { 1764 char *str; 1765 void *packed; 1766 uint8_t *compressed; 1767 uint64_t val; 1768 nvlist_t *token_nv = fnvlist_alloc(); 1769 size_t packed_size, compressed_size; 1770 1771 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1772 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1773 fnvlist_add_uint64(token_nv, "fromguid", val); 1774 } 1775 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1776 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1777 fnvlist_add_uint64(token_nv, "object", val); 1778 } 1779 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1780 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1781 fnvlist_add_uint64(token_nv, "offset", val); 1782 } 1783 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1784 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1785 fnvlist_add_uint64(token_nv, "bytes", val); 1786 } 1787 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1788 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1789 fnvlist_add_uint64(token_nv, "toguid", val); 1790 } 1791 char buf[256]; 1792 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1793 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1794 fnvlist_add_string(token_nv, "toname", buf); 1795 } 1796 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1797 DS_FIELD_RESUME_EMBEDOK) == 0) { 1798 fnvlist_add_boolean(token_nv, "embedok"); 1799 } 1800 packed = fnvlist_pack(token_nv, &packed_size); 1801 fnvlist_free(token_nv); 1802 compressed = kmem_alloc(packed_size, KM_SLEEP); 1803 1804 compressed_size = gzip_compress(packed, compressed, 1805 packed_size, packed_size, 6); 1806 1807 zio_cksum_t cksum; 1808 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1809 1810 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1811 for (int i = 0; i < compressed_size; i++) { 1812 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1813 } 1814 str[compressed_size * 2] = '\0'; 1815 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1816 ZFS_SEND_RESUME_TOKEN_VERSION, 1817 (longlong_t)cksum.zc_word[0], 1818 (longlong_t)packed_size, str); 1819 dsl_prop_nvlist_add_string(nv, 1820 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1821 kmem_free(packed, packed_size); 1822 kmem_free(str, compressed_size * 2 + 1); 1823 kmem_free(compressed, packed_size); 1824 strfree(propval); 1825 } 1826} 1827 1828void 1829dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1830{ 1831 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1832 uint64_t refd, avail, uobjs, aobjs, ratio; 1833 1834 ASSERT(dsl_pool_config_held(dp)); 1835 1836 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1837 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1838 dsl_dataset_phys(ds)->ds_compressed_bytes); 1839 1840 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1841 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1842 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1843 1844 if (ds->ds_is_snapshot) { 1845 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1846 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1847 dsl_dataset_phys(ds)->ds_unique_bytes); 1848 get_clones_stat(ds, nv); 1849 } else { 1850 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1851 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1852 dsl_dataset_name(ds->ds_prev, buf); 1853 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1854 } 1855 1856 dsl_dir_stats(ds->ds_dir, nv); 1857 } 1858 1859 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1860 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1861 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1862 1863 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1864 dsl_dataset_phys(ds)->ds_creation_time); 1865 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1866 dsl_dataset_phys(ds)->ds_creation_txg); 1867 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1868 ds->ds_quota); 1869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1870 ds->ds_reserved); 1871 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1872 dsl_dataset_phys(ds)->ds_guid); 1873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1874 dsl_dataset_phys(ds)->ds_unique_bytes); 1875 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1876 ds->ds_object); 1877 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1878 ds->ds_userrefs); 1879 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1880 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1881 1882 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1883 uint64_t written, comp, uncomp; 1884 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1885 dsl_dataset_t *prev; 1886 1887 int err = dsl_dataset_hold_obj(dp, 1888 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1889 if (err == 0) { 1890 err = dsl_dataset_space_written(prev, ds, &written, 1891 &comp, &uncomp); 1892 dsl_dataset_rele(prev, FTAG); 1893 if (err == 0) { 1894 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1895 written); 1896 } 1897 } 1898 } 1899 1900 if (!dsl_dataset_is_snapshot(ds)) { 1901 /* 1902 * A failed "newfs" (e.g. full) resumable receive leaves 1903 * the stats set on this dataset. Check here for the prop. 1904 */ 1905 get_receive_resume_stats(ds, nv); 1906 1907 /* 1908 * A failed incremental resumable receive leaves the 1909 * stats set on our child named "%recv". Check the child 1910 * for the prop. 1911 */ 1912 /* 6 extra bytes for /%recv */ 1913 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1914 dsl_dataset_t *recv_ds; 1915 dsl_dataset_name(ds, recvname); 1916 if (strlcat(recvname, "/", sizeof (recvname)) < 1917 sizeof (recvname) && 1918 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 1919 sizeof (recvname) && 1920 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1921 get_receive_resume_stats(recv_ds, nv); 1922 dsl_dataset_rele(recv_ds, FTAG); 1923 } 1924 } 1925} 1926 1927void 1928dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1929{ 1930 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1931 ASSERT(dsl_pool_config_held(dp)); 1932 1933 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1934 stat->dds_inconsistent = 1935 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1936 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1937 stat->dds_origin[0] = '\0'; 1938 if (ds->ds_is_snapshot) { 1939 stat->dds_is_snapshot = B_TRUE; 1940 stat->dds_num_clones = 1941 dsl_dataset_phys(ds)->ds_num_children - 1; 1942 } else { 1943 stat->dds_is_snapshot = B_FALSE; 1944 stat->dds_num_clones = 0; 1945 1946 if (dsl_dir_is_clone(ds->ds_dir)) { 1947 dsl_dataset_t *ods; 1948 1949 VERIFY0(dsl_dataset_hold_obj(dp, 1950 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1951 FTAG, &ods)); 1952 dsl_dataset_name(ods, stat->dds_origin); 1953 dsl_dataset_rele(ods, FTAG); 1954 } 1955 } 1956} 1957 1958uint64_t 1959dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1960{ 1961 return (ds->ds_fsid_guid); 1962} 1963 1964void 1965dsl_dataset_space(dsl_dataset_t *ds, 1966 uint64_t *refdbytesp, uint64_t *availbytesp, 1967 uint64_t *usedobjsp, uint64_t *availobjsp) 1968{ 1969 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1970 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1971 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1972 *availbytesp += 1973 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1974 if (ds->ds_quota != 0) { 1975 /* 1976 * Adjust available bytes according to refquota 1977 */ 1978 if (*refdbytesp < ds->ds_quota) 1979 *availbytesp = MIN(*availbytesp, 1980 ds->ds_quota - *refdbytesp); 1981 else 1982 *availbytesp = 0; 1983 } 1984 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1985 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1986} 1987 1988boolean_t 1989dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1990{ 1991 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1992 1993 ASSERT(dsl_pool_config_held(dp)); 1994 if (snap == NULL) 1995 return (B_FALSE); 1996 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1997 dsl_dataset_phys(snap)->ds_creation_txg) { 1998 objset_t *os, *os_snap; 1999 /* 2000 * It may be that only the ZIL differs, because it was 2001 * reset in the head. Don't count that as being 2002 * modified. 2003 */ 2004 if (dmu_objset_from_ds(ds, &os) != 0) 2005 return (B_TRUE); 2006 if (dmu_objset_from_ds(snap, &os_snap) != 0) 2007 return (B_TRUE); 2008 return (bcmp(&os->os_phys->os_meta_dnode, 2009 &os_snap->os_phys->os_meta_dnode, 2010 sizeof (os->os_phys->os_meta_dnode)) != 0); 2011 } 2012 return (B_FALSE); 2013} 2014 2015typedef struct dsl_dataset_rename_snapshot_arg { 2016 const char *ddrsa_fsname; 2017 const char *ddrsa_oldsnapname; 2018 const char *ddrsa_newsnapname; 2019 boolean_t ddrsa_recursive; 2020 dmu_tx_t *ddrsa_tx; 2021} dsl_dataset_rename_snapshot_arg_t; 2022 2023/* ARGSUSED */ 2024static int 2025dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2026 dsl_dataset_t *hds, void *arg) 2027{ 2028 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2029 int error; 2030 uint64_t val; 2031 2032 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2033 if (error != 0) { 2034 /* ignore nonexistent snapshots */ 2035 return (error == ENOENT ? 0 : error); 2036 } 2037 2038 /* new name should not exist */ 2039 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2040 if (error == 0) 2041 error = SET_ERROR(EEXIST); 2042 else if (error == ENOENT) 2043 error = 0; 2044 2045 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2046 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2047 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 2048 error = SET_ERROR(ENAMETOOLONG); 2049 2050 return (error); 2051} 2052 2053static int 2054dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2055{ 2056 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2057 dsl_pool_t *dp = dmu_tx_pool(tx); 2058 dsl_dataset_t *hds; 2059 int error; 2060 2061 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2062 if (error != 0) 2063 return (error); 2064 2065 if (ddrsa->ddrsa_recursive) { 2066 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2067 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2068 DS_FIND_CHILDREN); 2069 } else { 2070 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2071 } 2072 dsl_dataset_rele(hds, FTAG); 2073 return (error); 2074} 2075 2076static int 2077dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2078 dsl_dataset_t *hds, void *arg) 2079{ 2080#ifdef __FreeBSD__ 2081#ifdef _KERNEL 2082 char *oldname, *newname; 2083#endif 2084#endif 2085 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2086 dsl_dataset_t *ds; 2087 uint64_t val; 2088 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2089 int error; 2090 2091 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2092 ASSERT(error == 0 || error == ENOENT); 2093 if (error == ENOENT) { 2094 /* ignore nonexistent snapshots */ 2095 return (0); 2096 } 2097 2098 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2099 2100 /* log before we change the name */ 2101 spa_history_log_internal_ds(ds, "rename", tx, 2102 "-> @%s", ddrsa->ddrsa_newsnapname); 2103 2104 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2105 B_FALSE)); 2106 mutex_enter(&ds->ds_lock); 2107 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2108 mutex_exit(&ds->ds_lock); 2109 VERIFY0(zap_add(dp->dp_meta_objset, 2110 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2111 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2112 2113#ifdef __FreeBSD__ 2114#ifdef _KERNEL 2115 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2116 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2117 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2118 ddrsa->ddrsa_oldsnapname); 2119 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2120 ddrsa->ddrsa_newsnapname); 2121 zfsvfs_update_fromname(oldname, newname); 2122 zvol_rename_minors(oldname, newname); 2123 kmem_free(newname, MAXPATHLEN); 2124 kmem_free(oldname, MAXPATHLEN); 2125#endif 2126#endif 2127 dsl_dataset_rele(ds, FTAG); 2128 2129 return (0); 2130} 2131 2132static void 2133dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2134{ 2135 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2136 dsl_pool_t *dp = dmu_tx_pool(tx); 2137 dsl_dataset_t *hds; 2138 2139 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2140 ddrsa->ddrsa_tx = tx; 2141 if (ddrsa->ddrsa_recursive) { 2142 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2143 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2144 DS_FIND_CHILDREN)); 2145 } else { 2146 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2147 } 2148 dsl_dataset_rele(hds, FTAG); 2149} 2150 2151int 2152dsl_dataset_rename_snapshot(const char *fsname, 2153 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2154{ 2155 dsl_dataset_rename_snapshot_arg_t ddrsa; 2156 2157 ddrsa.ddrsa_fsname = fsname; 2158 ddrsa.ddrsa_oldsnapname = oldsnapname; 2159 ddrsa.ddrsa_newsnapname = newsnapname; 2160 ddrsa.ddrsa_recursive = recursive; 2161 2162 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2163 dsl_dataset_rename_snapshot_sync, &ddrsa, 2164 1, ZFS_SPACE_CHECK_RESERVED)); 2165} 2166 2167/* 2168 * If we're doing an ownership handoff, we need to make sure that there is 2169 * only one long hold on the dataset. We're not allowed to change anything here 2170 * so we don't permanently release the long hold or regular hold here. We want 2171 * to do this only when syncing to avoid the dataset unexpectedly going away 2172 * when we release the long hold. 2173 */ 2174static int 2175dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2176{ 2177 boolean_t held; 2178 2179 if (!dmu_tx_is_syncing(tx)) 2180 return (0); 2181 2182 if (owner != NULL) { 2183 VERIFY3P(ds->ds_owner, ==, owner); 2184 dsl_dataset_long_rele(ds, owner); 2185 } 2186 2187 held = dsl_dataset_long_held(ds); 2188 2189 if (owner != NULL) 2190 dsl_dataset_long_hold(ds, owner); 2191 2192 if (held) 2193 return (SET_ERROR(EBUSY)); 2194 2195 return (0); 2196} 2197 2198typedef struct dsl_dataset_rollback_arg { 2199 const char *ddra_fsname; 2200 void *ddra_owner; 2201 nvlist_t *ddra_result; 2202} dsl_dataset_rollback_arg_t; 2203 2204static int 2205dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2206{ 2207 dsl_dataset_rollback_arg_t *ddra = arg; 2208 dsl_pool_t *dp = dmu_tx_pool(tx); 2209 dsl_dataset_t *ds; 2210 int64_t unused_refres_delta; 2211 int error; 2212 2213 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2214 if (error != 0) 2215 return (error); 2216 2217 /* must not be a snapshot */ 2218 if (ds->ds_is_snapshot) { 2219 dsl_dataset_rele(ds, FTAG); 2220 return (SET_ERROR(EINVAL)); 2221 } 2222 2223 /* must have a most recent snapshot */ 2224 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2225 dsl_dataset_rele(ds, FTAG); 2226 return (SET_ERROR(EINVAL)); 2227 } 2228 2229 /* must not have any bookmarks after the most recent snapshot */ 2230 nvlist_t *proprequest = fnvlist_alloc(); 2231 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2232 nvlist_t *bookmarks = fnvlist_alloc(); 2233 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2234 fnvlist_free(proprequest); 2235 if (error != 0) 2236 return (error); 2237 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2238 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2239 nvlist_t *valuenv = 2240 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2241 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2242 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2243 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2244 fnvlist_free(bookmarks); 2245 dsl_dataset_rele(ds, FTAG); 2246 return (SET_ERROR(EEXIST)); 2247 } 2248 } 2249 fnvlist_free(bookmarks); 2250 2251 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2252 if (error != 0) { 2253 dsl_dataset_rele(ds, FTAG); 2254 return (error); 2255 } 2256 2257 /* 2258 * Check if the snap we are rolling back to uses more than 2259 * the refquota. 2260 */ 2261 if (ds->ds_quota != 0 && 2262 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2263 dsl_dataset_rele(ds, FTAG); 2264 return (SET_ERROR(EDQUOT)); 2265 } 2266 2267 /* 2268 * When we do the clone swap, we will temporarily use more space 2269 * due to the refreservation (the head will no longer have any 2270 * unique space, so the entire amount of the refreservation will need 2271 * to be free). We will immediately destroy the clone, freeing 2272 * this space, but the freeing happens over many txg's. 2273 */ 2274 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2275 dsl_dataset_phys(ds)->ds_unique_bytes); 2276 2277 if (unused_refres_delta > 0 && 2278 unused_refres_delta > 2279 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2280 dsl_dataset_rele(ds, FTAG); 2281 return (SET_ERROR(ENOSPC)); 2282 } 2283 2284 dsl_dataset_rele(ds, FTAG); 2285 return (0); 2286} 2287 2288static void 2289dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2290{ 2291 dsl_dataset_rollback_arg_t *ddra = arg; 2292 dsl_pool_t *dp = dmu_tx_pool(tx); 2293 dsl_dataset_t *ds, *clone; 2294 uint64_t cloneobj; 2295 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2296 2297 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2298 2299 dsl_dataset_name(ds->ds_prev, namebuf); 2300 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2301 2302 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2303 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2304 2305 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2306 2307 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2308 dsl_dataset_zero_zil(ds, tx); 2309 2310 dsl_destroy_head_sync_impl(clone, tx); 2311 2312 dsl_dataset_rele(clone, FTAG); 2313 dsl_dataset_rele(ds, FTAG); 2314} 2315 2316/* 2317 * Rolls back the given filesystem or volume to the most recent snapshot. 2318 * The name of the most recent snapshot will be returned under key "target" 2319 * in the result nvlist. 2320 * 2321 * If owner != NULL: 2322 * - The existing dataset MUST be owned by the specified owner at entry 2323 * - Upon return, dataset will still be held by the same owner, whether we 2324 * succeed or not. 2325 * 2326 * This mode is required any time the existing filesystem is mounted. See 2327 * notes above zfs_suspend_fs() for further details. 2328 */ 2329int 2330dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2331{ 2332 dsl_dataset_rollback_arg_t ddra; 2333 2334 ddra.ddra_fsname = fsname; 2335 ddra.ddra_owner = owner; 2336 ddra.ddra_result = result; 2337 2338 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2339 dsl_dataset_rollback_sync, &ddra, 2340 1, ZFS_SPACE_CHECK_RESERVED)); 2341} 2342 2343struct promotenode { 2344 list_node_t link; 2345 dsl_dataset_t *ds; 2346}; 2347 2348typedef struct dsl_dataset_promote_arg { 2349 const char *ddpa_clonename; 2350 dsl_dataset_t *ddpa_clone; 2351 list_t shared_snaps, origin_snaps, clone_snaps; 2352 dsl_dataset_t *origin_origin; /* origin of the origin */ 2353 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2354 char *err_ds; 2355 cred_t *cr; 2356} dsl_dataset_promote_arg_t; 2357 2358static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2359static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2360 void *tag); 2361static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2362 2363static int 2364dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2365{ 2366 dsl_dataset_promote_arg_t *ddpa = arg; 2367 dsl_pool_t *dp = dmu_tx_pool(tx); 2368 dsl_dataset_t *hds; 2369 struct promotenode *snap; 2370 dsl_dataset_t *origin_ds; 2371 int err; 2372 uint64_t unused; 2373 uint64_t ss_mv_cnt; 2374 size_t max_snap_len; 2375 2376 err = promote_hold(ddpa, dp, FTAG); 2377 if (err != 0) 2378 return (err); 2379 2380 hds = ddpa->ddpa_clone; 2381 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2382 2383 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2384 promote_rele(ddpa, FTAG); 2385 return (SET_ERROR(EXDEV)); 2386 } 2387 2388 /* 2389 * Compute and check the amount of space to transfer. Since this is 2390 * so expensive, don't do the preliminary check. 2391 */ 2392 if (!dmu_tx_is_syncing(tx)) { 2393 promote_rele(ddpa, FTAG); 2394 return (0); 2395 } 2396 2397 snap = list_head(&ddpa->shared_snaps); 2398 origin_ds = snap->ds; 2399 2400 /* compute origin's new unique space */ 2401 snap = list_tail(&ddpa->clone_snaps); 2402 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2403 origin_ds->ds_object); 2404 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2405 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2406 &ddpa->unique, &unused, &unused); 2407 2408 /* 2409 * Walk the snapshots that we are moving 2410 * 2411 * Compute space to transfer. Consider the incremental changes 2412 * to used by each snapshot: 2413 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2414 * So each snapshot gave birth to: 2415 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2416 * So a sequence would look like: 2417 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2418 * Which simplifies to: 2419 * uN + kN + kN-1 + ... + k1 + k0 2420 * Note however, if we stop before we reach the ORIGIN we get: 2421 * uN + kN + kN-1 + ... + kM - uM-1 2422 */ 2423 ss_mv_cnt = 0; 2424 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2425 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2426 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2427 for (snap = list_head(&ddpa->shared_snaps); snap; 2428 snap = list_next(&ddpa->shared_snaps, snap)) { 2429 uint64_t val, dlused, dlcomp, dluncomp; 2430 dsl_dataset_t *ds = snap->ds; 2431 2432 ss_mv_cnt++; 2433 2434 /* 2435 * If there are long holds, we won't be able to evict 2436 * the objset. 2437 */ 2438 if (dsl_dataset_long_held(ds)) { 2439 err = SET_ERROR(EBUSY); 2440 goto out; 2441 } 2442 2443 /* Check that the snapshot name does not conflict */ 2444 VERIFY0(dsl_dataset_get_snapname(ds)); 2445 if (strlen(ds->ds_snapname) >= max_snap_len) { 2446 err = SET_ERROR(ENAMETOOLONG); 2447 goto out; 2448 } 2449 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2450 if (err == 0) { 2451 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2452 err = SET_ERROR(EEXIST); 2453 goto out; 2454 } 2455 if (err != ENOENT) 2456 goto out; 2457 2458 /* The very first snapshot does not have a deadlist */ 2459 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2460 continue; 2461 2462 dsl_deadlist_space(&ds->ds_deadlist, 2463 &dlused, &dlcomp, &dluncomp); 2464 ddpa->used += dlused; 2465 ddpa->comp += dlcomp; 2466 ddpa->uncomp += dluncomp; 2467 } 2468 2469 /* 2470 * If we are a clone of a clone then we never reached ORIGIN, 2471 * so we need to subtract out the clone origin's used space. 2472 */ 2473 if (ddpa->origin_origin) { 2474 ddpa->used -= 2475 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2476 ddpa->comp -= 2477 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2478 ddpa->uncomp -= 2479 dsl_dataset_phys(ddpa->origin_origin)-> 2480 ds_uncompressed_bytes; 2481 } 2482 2483 /* Check that there is enough space and limit headroom here */ 2484 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2485 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2486 if (err != 0) 2487 goto out; 2488 2489 /* 2490 * Compute the amounts of space that will be used by snapshots 2491 * after the promotion (for both origin and clone). For each, 2492 * it is the amount of space that will be on all of their 2493 * deadlists (that was not born before their new origin). 2494 */ 2495 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2496 uint64_t space; 2497 2498 /* 2499 * Note, typically this will not be a clone of a clone, 2500 * so dd_origin_txg will be < TXG_INITIAL, so 2501 * these snaplist_space() -> dsl_deadlist_space_range() 2502 * calls will be fast because they do not have to 2503 * iterate over all bps. 2504 */ 2505 snap = list_head(&ddpa->origin_snaps); 2506 err = snaplist_space(&ddpa->shared_snaps, 2507 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2508 if (err != 0) 2509 goto out; 2510 2511 err = snaplist_space(&ddpa->clone_snaps, 2512 snap->ds->ds_dir->dd_origin_txg, &space); 2513 if (err != 0) 2514 goto out; 2515 ddpa->cloneusedsnap += space; 2516 } 2517 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2518 DD_FLAG_USED_BREAKDOWN) { 2519 err = snaplist_space(&ddpa->origin_snaps, 2520 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2521 &ddpa->originusedsnap); 2522 if (err != 0) 2523 goto out; 2524 } 2525 2526out: 2527 promote_rele(ddpa, FTAG); 2528 return (err); 2529} 2530 2531static void 2532dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2533{ 2534 dsl_dataset_promote_arg_t *ddpa = arg; 2535 dsl_pool_t *dp = dmu_tx_pool(tx); 2536 dsl_dataset_t *hds; 2537 struct promotenode *snap; 2538 dsl_dataset_t *origin_ds; 2539 dsl_dataset_t *origin_head; 2540 dsl_dir_t *dd; 2541 dsl_dir_t *odd = NULL; 2542 uint64_t oldnext_obj; 2543 int64_t delta; 2544#if defined(__FreeBSD__) && defined(_KERNEL) 2545 char *oldname, *newname; 2546#endif 2547 2548 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2549 hds = ddpa->ddpa_clone; 2550 2551 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2552 2553 snap = list_head(&ddpa->shared_snaps); 2554 origin_ds = snap->ds; 2555 dd = hds->ds_dir; 2556 2557 snap = list_head(&ddpa->origin_snaps); 2558 origin_head = snap->ds; 2559 2560 /* 2561 * We need to explicitly open odd, since origin_ds's dd will be 2562 * changing. 2563 */ 2564 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2565 NULL, FTAG, &odd)); 2566 2567 /* change origin's next snap */ 2568 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2569 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2570 snap = list_tail(&ddpa->clone_snaps); 2571 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2572 origin_ds->ds_object); 2573 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2574 2575 /* change the origin's next clone */ 2576 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2577 dsl_dataset_remove_from_next_clones(origin_ds, 2578 snap->ds->ds_object, tx); 2579 VERIFY0(zap_add_int(dp->dp_meta_objset, 2580 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2581 oldnext_obj, tx)); 2582 } 2583 2584 /* change origin */ 2585 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2586 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2587 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2588 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2589 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2590 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2591 origin_head->ds_dir->dd_origin_txg = 2592 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2593 2594 /* change dd_clone entries */ 2595 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2596 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2597 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2598 VERIFY0(zap_add_int(dp->dp_meta_objset, 2599 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2600 hds->ds_object, tx)); 2601 2602 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2603 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2604 origin_head->ds_object, tx)); 2605 if (dsl_dir_phys(dd)->dd_clones == 0) { 2606 dsl_dir_phys(dd)->dd_clones = 2607 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2608 DMU_OT_NONE, 0, tx); 2609 } 2610 VERIFY0(zap_add_int(dp->dp_meta_objset, 2611 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2612 } 2613 2614#if defined(__FreeBSD__) && defined(_KERNEL) 2615 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2616 mutex_enter(&spa_namespace_lock); 2617 2618 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2619 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2620#endif 2621 2622 /* move snapshots to this dir */ 2623 for (snap = list_head(&ddpa->shared_snaps); snap; 2624 snap = list_next(&ddpa->shared_snaps, snap)) { 2625 dsl_dataset_t *ds = snap->ds; 2626 2627 /* 2628 * Property callbacks are registered to a particular 2629 * dsl_dir. Since ours is changing, evict the objset 2630 * so that they will be unregistered from the old dsl_dir. 2631 */ 2632 if (ds->ds_objset) { 2633 dmu_objset_evict(ds->ds_objset); 2634 ds->ds_objset = NULL; 2635 } 2636 2637 /* move snap name entry */ 2638 VERIFY0(dsl_dataset_get_snapname(ds)); 2639 VERIFY0(dsl_dataset_snap_remove(origin_head, 2640 ds->ds_snapname, tx, B_TRUE)); 2641 VERIFY0(zap_add(dp->dp_meta_objset, 2642 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2643 8, 1, &ds->ds_object, tx)); 2644 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2645 DD_FIELD_SNAPSHOT_COUNT, tx); 2646 2647 /* change containing dsl_dir */ 2648 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2649 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2650 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2651 ASSERT3P(ds->ds_dir, ==, odd); 2652 dsl_dir_rele(ds->ds_dir, ds); 2653 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2654 NULL, ds, &ds->ds_dir)); 2655 2656#if defined(__FreeBSD__) && defined(_KERNEL) 2657 dsl_dataset_name(ds, newname); 2658 zfsvfs_update_fromname(oldname, newname); 2659 zvol_rename_minors(oldname, newname); 2660#endif 2661 2662 /* move any clone references */ 2663 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2664 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2665 zap_cursor_t zc; 2666 zap_attribute_t za; 2667 2668 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2669 dsl_dataset_phys(ds)->ds_next_clones_obj); 2670 zap_cursor_retrieve(&zc, &za) == 0; 2671 zap_cursor_advance(&zc)) { 2672 dsl_dataset_t *cnds; 2673 uint64_t o; 2674 2675 if (za.za_first_integer == oldnext_obj) { 2676 /* 2677 * We've already moved the 2678 * origin's reference. 2679 */ 2680 continue; 2681 } 2682 2683 VERIFY0(dsl_dataset_hold_obj(dp, 2684 za.za_first_integer, FTAG, &cnds)); 2685 o = dsl_dir_phys(cnds->ds_dir)-> 2686 dd_head_dataset_obj; 2687 2688 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2689 dsl_dir_phys(odd)->dd_clones, o, tx)); 2690 VERIFY0(zap_add_int(dp->dp_meta_objset, 2691 dsl_dir_phys(dd)->dd_clones, o, tx)); 2692 dsl_dataset_rele(cnds, FTAG); 2693 } 2694 zap_cursor_fini(&zc); 2695 } 2696 2697 ASSERT(!dsl_prop_hascb(ds)); 2698 } 2699 2700#if defined(__FreeBSD__) && defined(_KERNEL) 2701 mutex_exit(&spa_namespace_lock); 2702 2703 kmem_free(newname, MAXPATHLEN); 2704 kmem_free(oldname, MAXPATHLEN); 2705#endif 2706 /* 2707 * Change space accounting. 2708 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2709 * both be valid, or both be 0 (resulting in delta == 0). This 2710 * is true for each of {clone,origin} independently. 2711 */ 2712 2713 delta = ddpa->cloneusedsnap - 2714 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2715 ASSERT3S(delta, >=, 0); 2716 ASSERT3U(ddpa->used, >=, delta); 2717 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2718 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2719 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2720 2721 delta = ddpa->originusedsnap - 2722 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2723 ASSERT3S(delta, <=, 0); 2724 ASSERT3U(ddpa->used, >=, -delta); 2725 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2726 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2727 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2728 2729 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2730 2731 /* log history record */ 2732 spa_history_log_internal_ds(hds, "promote", tx, ""); 2733 2734 dsl_dir_rele(odd, FTAG); 2735 promote_rele(ddpa, FTAG); 2736} 2737 2738/* 2739 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2740 * (exclusive) and last_obj (inclusive). The list will be in reverse 2741 * order (last_obj will be the list_head()). If first_obj == 0, do all 2742 * snapshots back to this dataset's origin. 2743 */ 2744static int 2745snaplist_make(dsl_pool_t *dp, 2746 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2747{ 2748 uint64_t obj = last_obj; 2749 2750 list_create(l, sizeof (struct promotenode), 2751 offsetof(struct promotenode, link)); 2752 2753 while (obj != first_obj) { 2754 dsl_dataset_t *ds; 2755 struct promotenode *snap; 2756 int err; 2757 2758 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2759 ASSERT(err != ENOENT); 2760 if (err != 0) 2761 return (err); 2762 2763 if (first_obj == 0) 2764 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2765 2766 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2767 snap->ds = ds; 2768 list_insert_tail(l, snap); 2769 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2770 } 2771 2772 return (0); 2773} 2774 2775static int 2776snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2777{ 2778 struct promotenode *snap; 2779 2780 *spacep = 0; 2781 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2782 uint64_t used, comp, uncomp; 2783 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2784 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2785 *spacep += used; 2786 } 2787 return (0); 2788} 2789 2790static void 2791snaplist_destroy(list_t *l, void *tag) 2792{ 2793 struct promotenode *snap; 2794 2795 if (l == NULL || !list_link_active(&l->list_head)) 2796 return; 2797 2798 while ((snap = list_tail(l)) != NULL) { 2799 list_remove(l, snap); 2800 dsl_dataset_rele(snap->ds, tag); 2801 kmem_free(snap, sizeof (*snap)); 2802 } 2803 list_destroy(l); 2804} 2805 2806static int 2807promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2808{ 2809 int error; 2810 dsl_dir_t *dd; 2811 struct promotenode *snap; 2812 2813 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2814 &ddpa->ddpa_clone); 2815 if (error != 0) 2816 return (error); 2817 dd = ddpa->ddpa_clone->ds_dir; 2818 2819 if (ddpa->ddpa_clone->ds_is_snapshot || 2820 !dsl_dir_is_clone(dd)) { 2821 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2822 return (SET_ERROR(EINVAL)); 2823 } 2824 2825 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2826 &ddpa->shared_snaps, tag); 2827 if (error != 0) 2828 goto out; 2829 2830 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2831 &ddpa->clone_snaps, tag); 2832 if (error != 0) 2833 goto out; 2834 2835 snap = list_head(&ddpa->shared_snaps); 2836 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2837 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2838 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2839 &ddpa->origin_snaps, tag); 2840 if (error != 0) 2841 goto out; 2842 2843 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2844 error = dsl_dataset_hold_obj(dp, 2845 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2846 tag, &ddpa->origin_origin); 2847 if (error != 0) 2848 goto out; 2849 } 2850out: 2851 if (error != 0) 2852 promote_rele(ddpa, tag); 2853 return (error); 2854} 2855 2856static void 2857promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2858{ 2859 snaplist_destroy(&ddpa->shared_snaps, tag); 2860 snaplist_destroy(&ddpa->clone_snaps, tag); 2861 snaplist_destroy(&ddpa->origin_snaps, tag); 2862 if (ddpa->origin_origin != NULL) 2863 dsl_dataset_rele(ddpa->origin_origin, tag); 2864 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2865} 2866 2867/* 2868 * Promote a clone. 2869 * 2870 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2871 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 2872 */ 2873int 2874dsl_dataset_promote(const char *name, char *conflsnap) 2875{ 2876 dsl_dataset_promote_arg_t ddpa = { 0 }; 2877 uint64_t numsnaps; 2878 int error; 2879 objset_t *os; 2880 2881 /* 2882 * We will modify space proportional to the number of 2883 * snapshots. Compute numsnaps. 2884 */ 2885 error = dmu_objset_hold(name, FTAG, &os); 2886 if (error != 0) 2887 return (error); 2888 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2889 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2890 &numsnaps); 2891 dmu_objset_rele(os, FTAG); 2892 if (error != 0) 2893 return (error); 2894 2895 ddpa.ddpa_clonename = name; 2896 ddpa.err_ds = conflsnap; 2897 ddpa.cr = CRED(); 2898 2899 return (dsl_sync_task(name, dsl_dataset_promote_check, 2900 dsl_dataset_promote_sync, &ddpa, 2901 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2902} 2903 2904int 2905dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2906 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2907{ 2908 /* 2909 * "slack" factor for received datasets with refquota set on them. 2910 * See the bottom of this function for details on its use. 2911 */ 2912 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 2913 int64_t unused_refres_delta; 2914 2915 /* they should both be heads */ 2916 if (clone->ds_is_snapshot || 2917 origin_head->ds_is_snapshot) 2918 return (SET_ERROR(EINVAL)); 2919 2920 /* if we are not forcing, the branch point should be just before them */ 2921 if (!force && clone->ds_prev != origin_head->ds_prev) 2922 return (SET_ERROR(EINVAL)); 2923 2924 /* clone should be the clone (unless they are unrelated) */ 2925 if (clone->ds_prev != NULL && 2926 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2927 origin_head->ds_dir != clone->ds_prev->ds_dir) 2928 return (SET_ERROR(EINVAL)); 2929 2930 /* the clone should be a child of the origin */ 2931 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2932 return (SET_ERROR(EINVAL)); 2933 2934 /* origin_head shouldn't be modified unless 'force' */ 2935 if (!force && 2936 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2937 return (SET_ERROR(ETXTBSY)); 2938 2939 /* origin_head should have no long holds (e.g. is not mounted) */ 2940 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2941 return (SET_ERROR(EBUSY)); 2942 2943 /* check amount of any unconsumed refreservation */ 2944 unused_refres_delta = 2945 (int64_t)MIN(origin_head->ds_reserved, 2946 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2947 (int64_t)MIN(origin_head->ds_reserved, 2948 dsl_dataset_phys(clone)->ds_unique_bytes); 2949 2950 if (unused_refres_delta > 0 && 2951 unused_refres_delta > 2952 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2953 return (SET_ERROR(ENOSPC)); 2954 2955 /* 2956 * The clone can't be too much over the head's refquota. 2957 * 2958 * To ensure that the entire refquota can be used, we allow one 2959 * transaction to exceed the the refquota. Therefore, this check 2960 * needs to also allow for the space referenced to be more than the 2961 * refquota. The maximum amount of space that one transaction can use 2962 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 2963 * overage ensures that we are able to receive a filesystem that 2964 * exceeds the refquota on the source system. 2965 * 2966 * So that overage is the refquota_slack we use below. 2967 */ 2968 if (origin_head->ds_quota != 0 && 2969 dsl_dataset_phys(clone)->ds_referenced_bytes > 2970 origin_head->ds_quota + refquota_slack) 2971 return (SET_ERROR(EDQUOT)); 2972 2973 return (0); 2974} 2975 2976void 2977dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2978 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2979{ 2980 dsl_pool_t *dp = dmu_tx_pool(tx); 2981 int64_t unused_refres_delta; 2982 2983 ASSERT(clone->ds_reserved == 0); 2984 /* 2985 * NOTE: On DEBUG kernels there could be a race between this and 2986 * the check function if spa_asize_inflation is adjusted... 2987 */ 2988 ASSERT(origin_head->ds_quota == 0 || 2989 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 2990 DMU_MAX_ACCESS * spa_asize_inflation); 2991 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2992 2993 /* 2994 * Swap per-dataset feature flags. 2995 */ 2996 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2997 if (!(spa_feature_table[f].fi_flags & 2998 ZFEATURE_FLAG_PER_DATASET)) { 2999 ASSERT(!clone->ds_feature_inuse[f]); 3000 ASSERT(!origin_head->ds_feature_inuse[f]); 3001 continue; 3002 } 3003 3004 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 3005 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 3006 3007 if (clone_inuse) { 3008 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 3009 clone->ds_feature_inuse[f] = B_FALSE; 3010 } 3011 if (origin_head_inuse) { 3012 dsl_dataset_deactivate_feature(origin_head->ds_object, 3013 f, tx); 3014 origin_head->ds_feature_inuse[f] = B_FALSE; 3015 } 3016 if (clone_inuse) { 3017 dsl_dataset_activate_feature(origin_head->ds_object, 3018 f, tx); 3019 origin_head->ds_feature_inuse[f] = B_TRUE; 3020 } 3021 if (origin_head_inuse) { 3022 dsl_dataset_activate_feature(clone->ds_object, f, tx); 3023 clone->ds_feature_inuse[f] = B_TRUE; 3024 } 3025 } 3026 3027 dmu_buf_will_dirty(clone->ds_dbuf, tx); 3028 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 3029 3030 if (clone->ds_objset != NULL) { 3031 dmu_objset_evict(clone->ds_objset); 3032 clone->ds_objset = NULL; 3033 } 3034 3035 if (origin_head->ds_objset != NULL) { 3036 dmu_objset_evict(origin_head->ds_objset); 3037 origin_head->ds_objset = NULL; 3038 } 3039 3040 unused_refres_delta = 3041 (int64_t)MIN(origin_head->ds_reserved, 3042 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3043 (int64_t)MIN(origin_head->ds_reserved, 3044 dsl_dataset_phys(clone)->ds_unique_bytes); 3045 3046 /* 3047 * Reset origin's unique bytes, if it exists. 3048 */ 3049 if (clone->ds_prev) { 3050 dsl_dataset_t *origin = clone->ds_prev; 3051 uint64_t comp, uncomp; 3052 3053 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3054 dsl_deadlist_space_range(&clone->ds_deadlist, 3055 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3056 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3057 } 3058 3059 /* swap blkptrs */ 3060 { 3061 blkptr_t tmp; 3062 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3063 dsl_dataset_phys(origin_head)->ds_bp = 3064 dsl_dataset_phys(clone)->ds_bp; 3065 dsl_dataset_phys(clone)->ds_bp = tmp; 3066 } 3067 3068 /* set dd_*_bytes */ 3069 { 3070 int64_t dused, dcomp, duncomp; 3071 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3072 uint64_t odl_used, odl_comp, odl_uncomp; 3073 3074 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3075 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3076 3077 dsl_deadlist_space(&clone->ds_deadlist, 3078 &cdl_used, &cdl_comp, &cdl_uncomp); 3079 dsl_deadlist_space(&origin_head->ds_deadlist, 3080 &odl_used, &odl_comp, &odl_uncomp); 3081 3082 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3083 cdl_used - 3084 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3085 odl_used); 3086 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3087 cdl_comp - 3088 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3089 odl_comp); 3090 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3091 cdl_uncomp - 3092 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3093 odl_uncomp); 3094 3095 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3096 dused, dcomp, duncomp, tx); 3097 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3098 -dused, -dcomp, -duncomp, tx); 3099 3100 /* 3101 * The difference in the space used by snapshots is the 3102 * difference in snapshot space due to the head's 3103 * deadlist (since that's the only thing that's 3104 * changing that affects the snapused). 3105 */ 3106 dsl_deadlist_space_range(&clone->ds_deadlist, 3107 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3108 &cdl_used, &cdl_comp, &cdl_uncomp); 3109 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3110 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3111 &odl_used, &odl_comp, &odl_uncomp); 3112 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3113 DD_USED_HEAD, DD_USED_SNAP, NULL); 3114 } 3115 3116 /* swap ds_*_bytes */ 3117 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3118 dsl_dataset_phys(clone)->ds_referenced_bytes); 3119 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3120 dsl_dataset_phys(clone)->ds_compressed_bytes); 3121 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3122 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3123 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3124 dsl_dataset_phys(clone)->ds_unique_bytes); 3125 3126 /* apply any parent delta for change in unconsumed refreservation */ 3127 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3128 unused_refres_delta, 0, 0, tx); 3129 3130 /* 3131 * Swap deadlists. 3132 */ 3133 dsl_deadlist_close(&clone->ds_deadlist); 3134 dsl_deadlist_close(&origin_head->ds_deadlist); 3135 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3136 dsl_dataset_phys(clone)->ds_deadlist_obj); 3137 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3138 dsl_dataset_phys(clone)->ds_deadlist_obj); 3139 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3140 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3141 3142 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3143 3144 spa_history_log_internal_ds(clone, "clone swap", tx, 3145 "parent=%s", origin_head->ds_dir->dd_myname); 3146} 3147 3148/* 3149 * Given a pool name and a dataset object number in that pool, 3150 * return the name of that dataset. 3151 */ 3152int 3153dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3154{ 3155 dsl_pool_t *dp; 3156 dsl_dataset_t *ds; 3157 int error; 3158 3159 error = dsl_pool_hold(pname, FTAG, &dp); 3160 if (error != 0) 3161 return (error); 3162 3163 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3164 if (error == 0) { 3165 dsl_dataset_name(ds, buf); 3166 dsl_dataset_rele(ds, FTAG); 3167 } 3168 dsl_pool_rele(dp, FTAG); 3169 3170 return (error); 3171} 3172 3173int 3174dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3175 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3176{ 3177 int error = 0; 3178 3179 ASSERT3S(asize, >, 0); 3180 3181 /* 3182 * *ref_rsrv is the portion of asize that will come from any 3183 * unconsumed refreservation space. 3184 */ 3185 *ref_rsrv = 0; 3186 3187 mutex_enter(&ds->ds_lock); 3188 /* 3189 * Make a space adjustment for reserved bytes. 3190 */ 3191 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3192 ASSERT3U(*used, >=, 3193 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3194 *used -= 3195 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3196 *ref_rsrv = 3197 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3198 } 3199 3200 if (!check_quota || ds->ds_quota == 0) { 3201 mutex_exit(&ds->ds_lock); 3202 return (0); 3203 } 3204 /* 3205 * If they are requesting more space, and our current estimate 3206 * is over quota, they get to try again unless the actual 3207 * on-disk is over quota and there are no pending changes (which 3208 * may free up space for us). 3209 */ 3210 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3211 ds->ds_quota) { 3212 if (inflight > 0 || 3213 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3214 error = SET_ERROR(ERESTART); 3215 else 3216 error = SET_ERROR(EDQUOT); 3217 } 3218 mutex_exit(&ds->ds_lock); 3219 3220 return (error); 3221} 3222 3223typedef struct dsl_dataset_set_qr_arg { 3224 const char *ddsqra_name; 3225 zprop_source_t ddsqra_source; 3226 uint64_t ddsqra_value; 3227} dsl_dataset_set_qr_arg_t; 3228 3229 3230/* ARGSUSED */ 3231static int 3232dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3233{ 3234 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3235 dsl_pool_t *dp = dmu_tx_pool(tx); 3236 dsl_dataset_t *ds; 3237 int error; 3238 uint64_t newval; 3239 3240 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3241 return (SET_ERROR(ENOTSUP)); 3242 3243 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3244 if (error != 0) 3245 return (error); 3246 3247 if (ds->ds_is_snapshot) { 3248 dsl_dataset_rele(ds, FTAG); 3249 return (SET_ERROR(EINVAL)); 3250 } 3251 3252 error = dsl_prop_predict(ds->ds_dir, 3253 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3254 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3255 if (error != 0) { 3256 dsl_dataset_rele(ds, FTAG); 3257 return (error); 3258 } 3259 3260 if (newval == 0) { 3261 dsl_dataset_rele(ds, FTAG); 3262 return (0); 3263 } 3264 3265 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3266 newval < ds->ds_reserved) { 3267 dsl_dataset_rele(ds, FTAG); 3268 return (SET_ERROR(ENOSPC)); 3269 } 3270 3271 dsl_dataset_rele(ds, FTAG); 3272 return (0); 3273} 3274 3275static void 3276dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3277{ 3278 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3279 dsl_pool_t *dp = dmu_tx_pool(tx); 3280 dsl_dataset_t *ds; 3281 uint64_t newval; 3282 3283 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3284 3285 dsl_prop_set_sync_impl(ds, 3286 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3287 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3288 &ddsqra->ddsqra_value, tx); 3289 3290 VERIFY0(dsl_prop_get_int_ds(ds, 3291 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3292 3293 if (ds->ds_quota != newval) { 3294 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3295 ds->ds_quota = newval; 3296 } 3297 dsl_dataset_rele(ds, FTAG); 3298} 3299 3300int 3301dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3302 uint64_t refquota) 3303{ 3304 dsl_dataset_set_qr_arg_t ddsqra; 3305 3306 ddsqra.ddsqra_name = dsname; 3307 ddsqra.ddsqra_source = source; 3308 ddsqra.ddsqra_value = refquota; 3309 3310 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3311 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3312} 3313 3314static int 3315dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3316{ 3317 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3318 dsl_pool_t *dp = dmu_tx_pool(tx); 3319 dsl_dataset_t *ds; 3320 int error; 3321 uint64_t newval, unique; 3322 3323 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3324 return (SET_ERROR(ENOTSUP)); 3325 3326 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3327 if (error != 0) 3328 return (error); 3329 3330 if (ds->ds_is_snapshot) { 3331 dsl_dataset_rele(ds, FTAG); 3332 return (SET_ERROR(EINVAL)); 3333 } 3334 3335 error = dsl_prop_predict(ds->ds_dir, 3336 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3337 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3338 if (error != 0) { 3339 dsl_dataset_rele(ds, FTAG); 3340 return (error); 3341 } 3342 3343 /* 3344 * If we are doing the preliminary check in open context, the 3345 * space estimates may be inaccurate. 3346 */ 3347 if (!dmu_tx_is_syncing(tx)) { 3348 dsl_dataset_rele(ds, FTAG); 3349 return (0); 3350 } 3351 3352 mutex_enter(&ds->ds_lock); 3353 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3354 dsl_dataset_recalc_head_uniq(ds); 3355 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3356 mutex_exit(&ds->ds_lock); 3357 3358 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3359 uint64_t delta = MAX(unique, newval) - 3360 MAX(unique, ds->ds_reserved); 3361 3362 if (delta > 3363 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3364 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3365 dsl_dataset_rele(ds, FTAG); 3366 return (SET_ERROR(ENOSPC)); 3367 } 3368 } 3369 3370 dsl_dataset_rele(ds, FTAG); 3371 return (0); 3372} 3373 3374void 3375dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3376 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3377{ 3378 uint64_t newval; 3379 uint64_t unique; 3380 int64_t delta; 3381 3382 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3383 source, sizeof (value), 1, &value, tx); 3384 3385 VERIFY0(dsl_prop_get_int_ds(ds, 3386 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3387 3388 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3389 mutex_enter(&ds->ds_dir->dd_lock); 3390 mutex_enter(&ds->ds_lock); 3391 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3392 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3393 delta = MAX(0, (int64_t)(newval - unique)) - 3394 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3395 ds->ds_reserved = newval; 3396 mutex_exit(&ds->ds_lock); 3397 3398 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3399 mutex_exit(&ds->ds_dir->dd_lock); 3400} 3401 3402static void 3403dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3404{ 3405 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3406 dsl_pool_t *dp = dmu_tx_pool(tx); 3407 dsl_dataset_t *ds; 3408 3409 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3410 dsl_dataset_set_refreservation_sync_impl(ds, 3411 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3412 dsl_dataset_rele(ds, FTAG); 3413} 3414 3415int 3416dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3417 uint64_t refreservation) 3418{ 3419 dsl_dataset_set_qr_arg_t ddsqra; 3420 3421 ddsqra.ddsqra_name = dsname; 3422 ddsqra.ddsqra_source = source; 3423 ddsqra.ddsqra_value = refreservation; 3424 3425 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3426 dsl_dataset_set_refreservation_sync, &ddsqra, 3427 0, ZFS_SPACE_CHECK_NONE)); 3428} 3429 3430/* 3431 * Return (in *usedp) the amount of space written in new that is not 3432 * present in oldsnap. New may be a snapshot or the head. Old must be 3433 * a snapshot before new, in new's filesystem (or its origin). If not then 3434 * fail and return EINVAL. 3435 * 3436 * The written space is calculated by considering two components: First, we 3437 * ignore any freed space, and calculate the written as new's used space 3438 * minus old's used space. Next, we add in the amount of space that was freed 3439 * between the two snapshots, thus reducing new's used space relative to old's. 3440 * Specifically, this is the space that was born before old->ds_creation_txg, 3441 * and freed before new (ie. on new's deadlist or a previous deadlist). 3442 * 3443 * space freed [---------------------] 3444 * snapshots ---O-------O--------O-------O------ 3445 * oldsnap new 3446 */ 3447int 3448dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3449 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3450{ 3451 int err = 0; 3452 uint64_t snapobj; 3453 dsl_pool_t *dp = new->ds_dir->dd_pool; 3454 3455 ASSERT(dsl_pool_config_held(dp)); 3456 3457 *usedp = 0; 3458 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3459 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3460 3461 *compp = 0; 3462 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3463 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3464 3465 *uncompp = 0; 3466 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3467 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3468 3469 snapobj = new->ds_object; 3470 while (snapobj != oldsnap->ds_object) { 3471 dsl_dataset_t *snap; 3472 uint64_t used, comp, uncomp; 3473 3474 if (snapobj == new->ds_object) { 3475 snap = new; 3476 } else { 3477 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3478 if (err != 0) 3479 break; 3480 } 3481 3482 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3483 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3484 /* 3485 * The blocks in the deadlist can not be born after 3486 * ds_prev_snap_txg, so get the whole deadlist space, 3487 * which is more efficient (especially for old-format 3488 * deadlists). Unfortunately the deadlist code 3489 * doesn't have enough information to make this 3490 * optimization itself. 3491 */ 3492 dsl_deadlist_space(&snap->ds_deadlist, 3493 &used, &comp, &uncomp); 3494 } else { 3495 dsl_deadlist_space_range(&snap->ds_deadlist, 3496 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3497 &used, &comp, &uncomp); 3498 } 3499 *usedp += used; 3500 *compp += comp; 3501 *uncompp += uncomp; 3502 3503 /* 3504 * If we get to the beginning of the chain of snapshots 3505 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3506 * was not a snapshot of/before new. 3507 */ 3508 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3509 if (snap != new) 3510 dsl_dataset_rele(snap, FTAG); 3511 if (snapobj == 0) { 3512 err = SET_ERROR(EINVAL); 3513 break; 3514 } 3515 3516 } 3517 return (err); 3518} 3519 3520/* 3521 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3522 * lastsnap, and all snapshots in between are deleted. 3523 * 3524 * blocks that would be freed [---------------------------] 3525 * snapshots ---O-------O--------O-------O--------O 3526 * firstsnap lastsnap 3527 * 3528 * This is the set of blocks that were born after the snap before firstsnap, 3529 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3530 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3531 * We calculate this by iterating over the relevant deadlists (from the snap 3532 * after lastsnap, backward to the snap after firstsnap), summing up the 3533 * space on the deadlist that was born after the snap before firstsnap. 3534 */ 3535int 3536dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3537 dsl_dataset_t *lastsnap, 3538 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3539{ 3540 int err = 0; 3541 uint64_t snapobj; 3542 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3543 3544 ASSERT(firstsnap->ds_is_snapshot); 3545 ASSERT(lastsnap->ds_is_snapshot); 3546 3547 /* 3548 * Check that the snapshots are in the same dsl_dir, and firstsnap 3549 * is before lastsnap. 3550 */ 3551 if (firstsnap->ds_dir != lastsnap->ds_dir || 3552 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3553 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3554 return (SET_ERROR(EINVAL)); 3555 3556 *usedp = *compp = *uncompp = 0; 3557 3558 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3559 while (snapobj != firstsnap->ds_object) { 3560 dsl_dataset_t *ds; 3561 uint64_t used, comp, uncomp; 3562 3563 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3564 if (err != 0) 3565 break; 3566 3567 dsl_deadlist_space_range(&ds->ds_deadlist, 3568 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3569 &used, &comp, &uncomp); 3570 *usedp += used; 3571 *compp += comp; 3572 *uncompp += uncomp; 3573 3574 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3575 ASSERT3U(snapobj, !=, 0); 3576 dsl_dataset_rele(ds, FTAG); 3577 } 3578 return (err); 3579} 3580 3581/* 3582 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3583 * For example, they could both be snapshots of the same filesystem, and 3584 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3585 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3586 * filesystem. Or 'earlier' could be the origin's origin. 3587 * 3588 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3589 */ 3590boolean_t 3591dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3592 uint64_t earlier_txg) 3593{ 3594 dsl_pool_t *dp = later->ds_dir->dd_pool; 3595 int error; 3596 boolean_t ret; 3597 3598 ASSERT(dsl_pool_config_held(dp)); 3599 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3600 3601 if (earlier_txg == 0) 3602 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3603 3604 if (later->ds_is_snapshot && 3605 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3606 return (B_FALSE); 3607 3608 if (later->ds_dir == earlier->ds_dir) 3609 return (B_TRUE); 3610 if (!dsl_dir_is_clone(later->ds_dir)) 3611 return (B_FALSE); 3612 3613 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3614 return (B_TRUE); 3615 dsl_dataset_t *origin; 3616 error = dsl_dataset_hold_obj(dp, 3617 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3618 if (error != 0) 3619 return (B_FALSE); 3620 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3621 dsl_dataset_rele(origin, FTAG); 3622 return (ret); 3623} 3624 3625void 3626dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3627{ 3628 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3629 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3630} 3631 3632boolean_t 3633dsl_dataset_is_zapified(dsl_dataset_t *ds) 3634{ 3635 dmu_object_info_t doi; 3636 3637 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3638 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3639} 3640 3641boolean_t 3642dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3643{ 3644 return (dsl_dataset_is_zapified(ds) && 3645 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3646 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3647} 3648