dsl_dataset.c revision 297112
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 */ 30 31#include <sys/dmu_objset.h> 32#include <sys/dsl_dataset.h> 33#include <sys/dsl_dir.h> 34#include <sys/dsl_prop.h> 35#include <sys/dsl_synctask.h> 36#include <sys/dmu_traverse.h> 37#include <sys/dmu_impl.h> 38#include <sys/dmu_send.h> 39#include <sys/dmu_tx.h> 40#include <sys/arc.h> 41#include <sys/zio.h> 42#include <sys/zap.h> 43#include <sys/zfeature.h> 44#include <sys/unique.h> 45#include <sys/zfs_context.h> 46#include <sys/zfs_ioctl.h> 47#include <sys/spa.h> 48#include <sys/zfs_znode.h> 49#include <sys/zfs_onexit.h> 50#include <sys/zvol.h> 51#include <sys/dsl_scan.h> 52#include <sys/dsl_deadlist.h> 53#include <sys/dsl_destroy.h> 54#include <sys/dsl_userhold.h> 55#include <sys/dsl_bookmark.h> 56#include <sys/dmu_send.h> 57#include <sys/zio_checksum.h> 58#include <sys/zio_compress.h> 59#include <zfs_fletcher.h> 60 61SYSCTL_DECL(_vfs_zfs); 62 63/* 64 * The SPA supports block sizes up to 16MB. However, very large blocks 65 * can have an impact on i/o latency (e.g. tying up a spinning disk for 66 * ~300ms), and also potentially on the memory allocator. Therefore, 67 * we do not allow the recordsize to be set larger than zfs_max_recordsize 68 * (default 1MB). Larger blocks can be created by changing this tunable, 69 * and pools with larger blocks can always be imported and used, regardless 70 * of this setting. 71 */ 72int zfs_max_recordsize = 1 * 1024 * 1024; 73SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 74 &zfs_max_recordsize, 0, 75 "Maximum block size. Expect dragons when tuning this."); 76 77#define SWITCH64(x, y) \ 78 { \ 79 uint64_t __tmp = (x); \ 80 (x) = (y); \ 81 (y) = __tmp; \ 82 } 83 84#define DS_REF_MAX (1ULL << 62) 85 86extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 87 88/* 89 * Figure out how much of this delta should be propogated to the dsl_dir 90 * layer. If there's a refreservation, that space has already been 91 * partially accounted for in our ancestors. 92 */ 93static int64_t 94parent_delta(dsl_dataset_t *ds, int64_t delta) 95{ 96 dsl_dataset_phys_t *ds_phys; 97 uint64_t old_bytes, new_bytes; 98 99 if (ds->ds_reserved == 0) 100 return (delta); 101 102 ds_phys = dsl_dataset_phys(ds); 103 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 104 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 105 106 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 107 return (new_bytes - old_bytes); 108} 109 110void 111dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 112{ 113 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 114 int compressed = BP_GET_PSIZE(bp); 115 int uncompressed = BP_GET_UCSIZE(bp); 116 int64_t delta; 117 118 dprintf_bp(bp, "ds=%p", ds); 119 120 ASSERT(dmu_tx_is_syncing(tx)); 121 /* It could have been compressed away to nothing */ 122 if (BP_IS_HOLE(bp)) 123 return; 124 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 125 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 126 if (ds == NULL) { 127 dsl_pool_mos_diduse_space(tx->tx_pool, 128 used, compressed, uncompressed); 129 return; 130 } 131 132 dmu_buf_will_dirty(ds->ds_dbuf, tx); 133 mutex_enter(&ds->ds_lock); 134 delta = parent_delta(ds, used); 135 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 136 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 137 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 138 dsl_dataset_phys(ds)->ds_unique_bytes += used; 139 140 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 141 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 142 B_TRUE; 143 } 144 145 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 146 if (f != SPA_FEATURE_NONE) 147 ds->ds_feature_activation_needed[f] = B_TRUE; 148 149 mutex_exit(&ds->ds_lock); 150 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 151 compressed, uncompressed, tx); 152 dsl_dir_transfer_space(ds->ds_dir, used - delta, 153 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 154} 155 156int 157dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 158 boolean_t async) 159{ 160 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 161 int compressed = BP_GET_PSIZE(bp); 162 int uncompressed = BP_GET_UCSIZE(bp); 163 164 if (BP_IS_HOLE(bp)) 165 return (0); 166 167 ASSERT(dmu_tx_is_syncing(tx)); 168 ASSERT(bp->blk_birth <= tx->tx_txg); 169 170 if (ds == NULL) { 171 dsl_free(tx->tx_pool, tx->tx_txg, bp); 172 dsl_pool_mos_diduse_space(tx->tx_pool, 173 -used, -compressed, -uncompressed); 174 return (used); 175 } 176 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 177 178 ASSERT(!ds->ds_is_snapshot); 179 dmu_buf_will_dirty(ds->ds_dbuf, tx); 180 181 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 182 int64_t delta; 183 184 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 185 dsl_free(tx->tx_pool, tx->tx_txg, bp); 186 187 mutex_enter(&ds->ds_lock); 188 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 189 !DS_UNIQUE_IS_ACCURATE(ds)); 190 delta = parent_delta(ds, -used); 191 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 192 mutex_exit(&ds->ds_lock); 193 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 194 delta, -compressed, -uncompressed, tx); 195 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 196 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 197 } else { 198 dprintf_bp(bp, "putting on dead list: %s", ""); 199 if (async) { 200 /* 201 * We are here as part of zio's write done callback, 202 * which means we're a zio interrupt thread. We can't 203 * call dsl_deadlist_insert() now because it may block 204 * waiting for I/O. Instead, put bp on the deferred 205 * queue and let dsl_pool_sync() finish the job. 206 */ 207 bplist_append(&ds->ds_pending_deadlist, bp); 208 } else { 209 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 210 } 211 ASSERT3U(ds->ds_prev->ds_object, ==, 212 dsl_dataset_phys(ds)->ds_prev_snap_obj); 213 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 214 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 215 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 216 ds->ds_object && bp->blk_birth > 217 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 218 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 219 mutex_enter(&ds->ds_prev->ds_lock); 220 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 221 mutex_exit(&ds->ds_prev->ds_lock); 222 } 223 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 224 dsl_dir_transfer_space(ds->ds_dir, used, 225 DD_USED_HEAD, DD_USED_SNAP, tx); 226 } 227 } 228 mutex_enter(&ds->ds_lock); 229 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 230 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 231 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 232 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 233 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 234 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 235 mutex_exit(&ds->ds_lock); 236 237 return (used); 238} 239 240uint64_t 241dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 242{ 243 uint64_t trysnap = 0; 244 245 if (ds == NULL) 246 return (0); 247 /* 248 * The snapshot creation could fail, but that would cause an 249 * incorrect FALSE return, which would only result in an 250 * overestimation of the amount of space that an operation would 251 * consume, which is OK. 252 * 253 * There's also a small window where we could miss a pending 254 * snapshot, because we could set the sync task in the quiescing 255 * phase. So this should only be used as a guess. 256 */ 257 if (ds->ds_trysnap_txg > 258 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 259 trysnap = ds->ds_trysnap_txg; 260 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 261} 262 263boolean_t 264dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 265 uint64_t blk_birth) 266{ 267 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 268 (bp != NULL && BP_IS_HOLE(bp))) 269 return (B_FALSE); 270 271 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 272 273 return (B_TRUE); 274} 275 276static void 277dsl_dataset_evict(void *dbu) 278{ 279 dsl_dataset_t *ds = dbu; 280 281 ASSERT(ds->ds_owner == NULL); 282 283 ds->ds_dbuf = NULL; 284 285 unique_remove(ds->ds_fsid_guid); 286 287 if (ds->ds_objset != NULL) 288 dmu_objset_evict(ds->ds_objset); 289 290 if (ds->ds_prev) { 291 dsl_dataset_rele(ds->ds_prev, ds); 292 ds->ds_prev = NULL; 293 } 294 295 bplist_destroy(&ds->ds_pending_deadlist); 296 if (ds->ds_deadlist.dl_os != NULL) 297 dsl_deadlist_close(&ds->ds_deadlist); 298 if (ds->ds_dir) 299 dsl_dir_async_rele(ds->ds_dir, ds); 300 301 ASSERT(!list_link_active(&ds->ds_synced_link)); 302 303 list_destroy(&ds->ds_prop_cbs); 304 if (mutex_owned(&ds->ds_lock)) 305 mutex_exit(&ds->ds_lock); 306 mutex_destroy(&ds->ds_lock); 307 if (mutex_owned(&ds->ds_opening_lock)) 308 mutex_exit(&ds->ds_opening_lock); 309 mutex_destroy(&ds->ds_opening_lock); 310 mutex_destroy(&ds->ds_sendstream_lock); 311 refcount_destroy(&ds->ds_longholds); 312 313 kmem_free(ds, sizeof (dsl_dataset_t)); 314} 315 316int 317dsl_dataset_get_snapname(dsl_dataset_t *ds) 318{ 319 dsl_dataset_phys_t *headphys; 320 int err; 321 dmu_buf_t *headdbuf; 322 dsl_pool_t *dp = ds->ds_dir->dd_pool; 323 objset_t *mos = dp->dp_meta_objset; 324 325 if (ds->ds_snapname[0]) 326 return (0); 327 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 328 return (0); 329 330 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 331 FTAG, &headdbuf); 332 if (err != 0) 333 return (err); 334 headphys = headdbuf->db_data; 335 err = zap_value_search(dp->dp_meta_objset, 336 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 337 dmu_buf_rele(headdbuf, FTAG); 338 return (err); 339} 340 341int 342dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 343{ 344 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 345 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 346 matchtype_t mt; 347 int err; 348 349 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 350 mt = MT_FIRST; 351 else 352 mt = MT_EXACT; 353 354 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 355 value, mt, NULL, 0, NULL); 356 if (err == ENOTSUP && mt == MT_FIRST) 357 err = zap_lookup(mos, snapobj, name, 8, 1, value); 358 return (err); 359} 360 361int 362dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 363 boolean_t adj_cnt) 364{ 365 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 366 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 367 matchtype_t mt; 368 int err; 369 370 dsl_dir_snap_cmtime_update(ds->ds_dir); 371 372 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 373 mt = MT_FIRST; 374 else 375 mt = MT_EXACT; 376 377 err = zap_remove_norm(mos, snapobj, name, mt, tx); 378 if (err == ENOTSUP && mt == MT_FIRST) 379 err = zap_remove(mos, snapobj, name, tx); 380 381 if (err == 0 && adj_cnt) 382 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 383 DD_FIELD_SNAPSHOT_COUNT, tx); 384 385 return (err); 386} 387 388boolean_t 389dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 390{ 391 dmu_buf_t *dbuf = ds->ds_dbuf; 392 boolean_t result = B_FALSE; 393 394 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 395 ds->ds_object, DMU_BONUS_BLKID, tag)) { 396 397 if (ds == dmu_buf_get_user(dbuf)) 398 result = B_TRUE; 399 else 400 dmu_buf_rele(dbuf, tag); 401 } 402 403 return (result); 404} 405 406int 407dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 408 dsl_dataset_t **dsp) 409{ 410 objset_t *mos = dp->dp_meta_objset; 411 dmu_buf_t *dbuf; 412 dsl_dataset_t *ds; 413 int err; 414 dmu_object_info_t doi; 415 416 ASSERT(dsl_pool_config_held(dp)); 417 418 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 419 if (err != 0) 420 return (err); 421 422 /* Make sure dsobj has the correct object type. */ 423 dmu_object_info_from_db(dbuf, &doi); 424 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 425 dmu_buf_rele(dbuf, tag); 426 return (SET_ERROR(EINVAL)); 427 } 428 429 ds = dmu_buf_get_user(dbuf); 430 if (ds == NULL) { 431 dsl_dataset_t *winner = NULL; 432 433 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 434 ds->ds_dbuf = dbuf; 435 ds->ds_object = dsobj; 436 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 437 438 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 439 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 440 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 441 refcount_create(&ds->ds_longholds); 442 443 bplist_create(&ds->ds_pending_deadlist); 444 dsl_deadlist_open(&ds->ds_deadlist, 445 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 446 447 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 448 offsetof(dmu_sendarg_t, dsa_link)); 449 450 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 451 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 452 453 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 454 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 455 if (!(spa_feature_table[f].fi_flags & 456 ZFEATURE_FLAG_PER_DATASET)) 457 continue; 458 err = zap_contains(mos, dsobj, 459 spa_feature_table[f].fi_guid); 460 if (err == 0) { 461 ds->ds_feature_inuse[f] = B_TRUE; 462 } else { 463 ASSERT3U(err, ==, ENOENT); 464 err = 0; 465 } 466 } 467 } 468 469 err = dsl_dir_hold_obj(dp, 470 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 471 if (err != 0) { 472 mutex_destroy(&ds->ds_lock); 473 mutex_destroy(&ds->ds_opening_lock); 474 mutex_destroy(&ds->ds_sendstream_lock); 475 refcount_destroy(&ds->ds_longholds); 476 bplist_destroy(&ds->ds_pending_deadlist); 477 dsl_deadlist_close(&ds->ds_deadlist); 478 kmem_free(ds, sizeof (dsl_dataset_t)); 479 dmu_buf_rele(dbuf, tag); 480 return (err); 481 } 482 483 if (!ds->ds_is_snapshot) { 484 ds->ds_snapname[0] = '\0'; 485 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 486 err = dsl_dataset_hold_obj(dp, 487 dsl_dataset_phys(ds)->ds_prev_snap_obj, 488 ds, &ds->ds_prev); 489 } 490 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 491 int zaperr = zap_lookup(mos, ds->ds_object, 492 DS_FIELD_BOOKMARK_NAMES, 493 sizeof (ds->ds_bookmarks), 1, 494 &ds->ds_bookmarks); 495 if (zaperr != ENOENT) 496 VERIFY0(zaperr); 497 } 498 } else { 499 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 500 err = dsl_dataset_get_snapname(ds); 501 if (err == 0 && 502 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 503 err = zap_count( 504 ds->ds_dir->dd_pool->dp_meta_objset, 505 dsl_dataset_phys(ds)->ds_userrefs_obj, 506 &ds->ds_userrefs); 507 } 508 } 509 510 if (err == 0 && !ds->ds_is_snapshot) { 511 err = dsl_prop_get_int_ds(ds, 512 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 513 &ds->ds_reserved); 514 if (err == 0) { 515 err = dsl_prop_get_int_ds(ds, 516 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 517 &ds->ds_quota); 518 } 519 } else { 520 ds->ds_reserved = ds->ds_quota = 0; 521 } 522 523 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 524 if (err == 0) 525 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 526 527 if (err != 0 || winner != NULL) { 528 bplist_destroy(&ds->ds_pending_deadlist); 529 dsl_deadlist_close(&ds->ds_deadlist); 530 if (ds->ds_prev) 531 dsl_dataset_rele(ds->ds_prev, ds); 532 dsl_dir_rele(ds->ds_dir, ds); 533 mutex_destroy(&ds->ds_lock); 534 mutex_destroy(&ds->ds_opening_lock); 535 mutex_destroy(&ds->ds_sendstream_lock); 536 refcount_destroy(&ds->ds_longholds); 537 kmem_free(ds, sizeof (dsl_dataset_t)); 538 if (err != 0) { 539 dmu_buf_rele(dbuf, tag); 540 return (err); 541 } 542 ds = winner; 543 } else { 544 ds->ds_fsid_guid = 545 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 546 } 547 } 548 ASSERT3P(ds->ds_dbuf, ==, dbuf); 549 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 550 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 551 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 552 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 553 *dsp = ds; 554 return (0); 555} 556 557int 558dsl_dataset_hold(dsl_pool_t *dp, const char *name, 559 void *tag, dsl_dataset_t **dsp) 560{ 561 dsl_dir_t *dd; 562 const char *snapname; 563 uint64_t obj; 564 int err = 0; 565 dsl_dataset_t *ds; 566 567 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 568 if (err != 0) 569 return (err); 570 571 ASSERT(dsl_pool_config_held(dp)); 572 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 573 if (obj != 0) 574 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 575 else 576 err = SET_ERROR(ENOENT); 577 578 /* we may be looking for a snapshot */ 579 if (err == 0 && snapname != NULL) { 580 dsl_dataset_t *snap_ds; 581 582 if (*snapname++ != '@') { 583 dsl_dataset_rele(ds, tag); 584 dsl_dir_rele(dd, FTAG); 585 return (SET_ERROR(ENOENT)); 586 } 587 588 dprintf("looking for snapshot '%s'\n", snapname); 589 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 590 if (err == 0) 591 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 592 dsl_dataset_rele(ds, tag); 593 594 if (err == 0) { 595 mutex_enter(&snap_ds->ds_lock); 596 if (snap_ds->ds_snapname[0] == 0) 597 (void) strlcpy(snap_ds->ds_snapname, snapname, 598 sizeof (snap_ds->ds_snapname)); 599 mutex_exit(&snap_ds->ds_lock); 600 ds = snap_ds; 601 } 602 } 603 if (err == 0) 604 *dsp = ds; 605 dsl_dir_rele(dd, FTAG); 606 return (err); 607} 608 609int 610dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 611 void *tag, dsl_dataset_t **dsp) 612{ 613 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 614 if (err != 0) 615 return (err); 616 if (!dsl_dataset_tryown(*dsp, tag)) { 617 dsl_dataset_rele(*dsp, tag); 618 *dsp = NULL; 619 return (SET_ERROR(EBUSY)); 620 } 621 return (0); 622} 623 624int 625dsl_dataset_own(dsl_pool_t *dp, const char *name, 626 void *tag, dsl_dataset_t **dsp) 627{ 628 int err = dsl_dataset_hold(dp, name, tag, dsp); 629 if (err != 0) 630 return (err); 631 if (!dsl_dataset_tryown(*dsp, tag)) { 632 dsl_dataset_rele(*dsp, tag); 633 return (SET_ERROR(EBUSY)); 634 } 635 return (0); 636} 637 638/* 639 * See the comment above dsl_pool_hold() for details. In summary, a long 640 * hold is used to prevent destruction of a dataset while the pool hold 641 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 642 * 643 * The dataset and pool must be held when this function is called. After it 644 * is called, the pool hold may be released while the dataset is still held 645 * and accessed. 646 */ 647void 648dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 649{ 650 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 651 (void) refcount_add(&ds->ds_longholds, tag); 652} 653 654void 655dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 656{ 657 (void) refcount_remove(&ds->ds_longholds, tag); 658} 659 660/* Return B_TRUE if there are any long holds on this dataset. */ 661boolean_t 662dsl_dataset_long_held(dsl_dataset_t *ds) 663{ 664 return (!refcount_is_zero(&ds->ds_longholds)); 665} 666 667void 668dsl_dataset_name(dsl_dataset_t *ds, char *name) 669{ 670 if (ds == NULL) { 671 (void) strcpy(name, "mos"); 672 } else { 673 dsl_dir_name(ds->ds_dir, name); 674 VERIFY0(dsl_dataset_get_snapname(ds)); 675 if (ds->ds_snapname[0]) { 676 (void) strcat(name, "@"); 677 /* 678 * We use a "recursive" mutex so that we 679 * can call dprintf_ds() with ds_lock held. 680 */ 681 if (!MUTEX_HELD(&ds->ds_lock)) { 682 mutex_enter(&ds->ds_lock); 683 (void) strcat(name, ds->ds_snapname); 684 mutex_exit(&ds->ds_lock); 685 } else { 686 (void) strcat(name, ds->ds_snapname); 687 } 688 } 689 } 690} 691 692void 693dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 694{ 695 dmu_buf_rele(ds->ds_dbuf, tag); 696} 697 698void 699dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 700{ 701 ASSERT3P(ds->ds_owner, ==, tag); 702 ASSERT(ds->ds_dbuf != NULL); 703 704 mutex_enter(&ds->ds_lock); 705 ds->ds_owner = NULL; 706 mutex_exit(&ds->ds_lock); 707 dsl_dataset_long_rele(ds, tag); 708 dsl_dataset_rele(ds, tag); 709} 710 711boolean_t 712dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 713{ 714 boolean_t gotit = FALSE; 715 716 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 717 mutex_enter(&ds->ds_lock); 718 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 719 ds->ds_owner = tag; 720 dsl_dataset_long_hold(ds, tag); 721 gotit = TRUE; 722 } 723 mutex_exit(&ds->ds_lock); 724 return (gotit); 725} 726 727boolean_t 728dsl_dataset_has_owner(dsl_dataset_t *ds) 729{ 730 boolean_t rv; 731 mutex_enter(&ds->ds_lock); 732 rv = (ds->ds_owner != NULL); 733 mutex_exit(&ds->ds_lock); 734 return (rv); 735} 736 737static void 738dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 739{ 740 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 741 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 742 uint64_t zero = 0; 743 744 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 745 746 spa_feature_incr(spa, f, tx); 747 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 748 749 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 750 sizeof (zero), 1, &zero, tx)); 751} 752 753void 754dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 755{ 756 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 757 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 758 759 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 760 761 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 762 spa_feature_decr(spa, f, tx); 763} 764 765uint64_t 766dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 767 uint64_t flags, dmu_tx_t *tx) 768{ 769 dsl_pool_t *dp = dd->dd_pool; 770 dmu_buf_t *dbuf; 771 dsl_dataset_phys_t *dsphys; 772 uint64_t dsobj; 773 objset_t *mos = dp->dp_meta_objset; 774 775 if (origin == NULL) 776 origin = dp->dp_origin_snap; 777 778 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 779 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 780 ASSERT(dmu_tx_is_syncing(tx)); 781 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 782 783 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 784 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 785 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 786 dmu_buf_will_dirty(dbuf, tx); 787 dsphys = dbuf->db_data; 788 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 789 dsphys->ds_dir_obj = dd->dd_object; 790 dsphys->ds_flags = flags; 791 dsphys->ds_fsid_guid = unique_create(); 792 do { 793 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 794 sizeof (dsphys->ds_guid)); 795 } while (dsphys->ds_guid == 0); 796 dsphys->ds_snapnames_zapobj = 797 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 798 DMU_OT_NONE, 0, tx); 799 dsphys->ds_creation_time = gethrestime_sec(); 800 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 801 802 if (origin == NULL) { 803 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 804 } else { 805 dsl_dataset_t *ohds; /* head of the origin snapshot */ 806 807 dsphys->ds_prev_snap_obj = origin->ds_object; 808 dsphys->ds_prev_snap_txg = 809 dsl_dataset_phys(origin)->ds_creation_txg; 810 dsphys->ds_referenced_bytes = 811 dsl_dataset_phys(origin)->ds_referenced_bytes; 812 dsphys->ds_compressed_bytes = 813 dsl_dataset_phys(origin)->ds_compressed_bytes; 814 dsphys->ds_uncompressed_bytes = 815 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 816 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 817 818 /* 819 * Inherit flags that describe the dataset's contents 820 * (INCONSISTENT) or properties (Case Insensitive). 821 */ 822 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 823 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 824 825 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 826 if (origin->ds_feature_inuse[f]) 827 dsl_dataset_activate_feature(dsobj, f, tx); 828 } 829 830 dmu_buf_will_dirty(origin->ds_dbuf, tx); 831 dsl_dataset_phys(origin)->ds_num_children++; 832 833 VERIFY0(dsl_dataset_hold_obj(dp, 834 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 835 FTAG, &ohds)); 836 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 837 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 838 dsl_dataset_rele(ohds, FTAG); 839 840 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 841 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 842 dsl_dataset_phys(origin)->ds_next_clones_obj = 843 zap_create(mos, 844 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 845 } 846 VERIFY0(zap_add_int(mos, 847 dsl_dataset_phys(origin)->ds_next_clones_obj, 848 dsobj, tx)); 849 } 850 851 dmu_buf_will_dirty(dd->dd_dbuf, tx); 852 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 853 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 854 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 855 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 856 dsl_dir_phys(origin->ds_dir)->dd_clones = 857 zap_create(mos, 858 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 859 } 860 VERIFY0(zap_add_int(mos, 861 dsl_dir_phys(origin->ds_dir)->dd_clones, 862 dsobj, tx)); 863 } 864 } 865 866 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 867 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 868 869 dmu_buf_rele(dbuf, FTAG); 870 871 dmu_buf_will_dirty(dd->dd_dbuf, tx); 872 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 873 874 return (dsobj); 875} 876 877static void 878dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 879{ 880 objset_t *os; 881 882 VERIFY0(dmu_objset_from_ds(ds, &os)); 883 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 884 dsl_dataset_dirty(ds, tx); 885} 886 887uint64_t 888dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 889 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 890{ 891 dsl_pool_t *dp = pdd->dd_pool; 892 uint64_t dsobj, ddobj; 893 dsl_dir_t *dd; 894 895 ASSERT(dmu_tx_is_syncing(tx)); 896 ASSERT(lastname[0] != '@'); 897 898 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 899 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 900 901 dsobj = dsl_dataset_create_sync_dd(dd, origin, 902 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 903 904 dsl_deleg_set_create_perms(dd, tx, cr); 905 906 /* 907 * Since we're creating a new node we know it's a leaf, so we can 908 * initialize the counts if the limit feature is active. 909 */ 910 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 911 uint64_t cnt = 0; 912 objset_t *os = dd->dd_pool->dp_meta_objset; 913 914 dsl_dir_zapify(dd, tx); 915 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 916 sizeof (cnt), 1, &cnt, tx)); 917 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 918 sizeof (cnt), 1, &cnt, tx)); 919 } 920 921 dsl_dir_rele(dd, FTAG); 922 923 /* 924 * If we are creating a clone, make sure we zero out any stale 925 * data from the origin snapshots zil header. 926 */ 927 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 928 dsl_dataset_t *ds; 929 930 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 931 dsl_dataset_zero_zil(ds, tx); 932 dsl_dataset_rele(ds, FTAG); 933 } 934 935 return (dsobj); 936} 937 938#ifdef __FreeBSD__ 939/* FreeBSD ioctl compat begin */ 940struct destroyarg { 941 nvlist_t *nvl; 942 const char *snapname; 943}; 944 945static int 946dsl_check_snap_cb(const char *name, void *arg) 947{ 948 struct destroyarg *da = arg; 949 dsl_dataset_t *ds; 950 char *dsname; 951 952 dsname = kmem_asprintf("%s@%s", name, da->snapname); 953 fnvlist_add_boolean(da->nvl, dsname); 954 kmem_free(dsname, strlen(dsname) + 1); 955 956 return (0); 957} 958 959int 960dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 961 nvlist_t *snaps) 962{ 963 struct destroyarg *da; 964 int err; 965 966 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 967 da->nvl = snaps; 968 da->snapname = snapname; 969 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 970 DS_FIND_CHILDREN); 971 kmem_free(da, sizeof (struct destroyarg)); 972 973 return (err); 974} 975/* FreeBSD ioctl compat end */ 976#endif /* __FreeBSD__ */ 977 978/* 979 * The unique space in the head dataset can be calculated by subtracting 980 * the space used in the most recent snapshot, that is still being used 981 * in this file system, from the space currently in use. To figure out 982 * the space in the most recent snapshot still in use, we need to take 983 * the total space used in the snapshot and subtract out the space that 984 * has been freed up since the snapshot was taken. 985 */ 986void 987dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 988{ 989 uint64_t mrs_used; 990 uint64_t dlused, dlcomp, dluncomp; 991 992 ASSERT(!ds->ds_is_snapshot); 993 994 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 995 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 996 else 997 mrs_used = 0; 998 999 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 1000 1001 ASSERT3U(dlused, <=, mrs_used); 1002 dsl_dataset_phys(ds)->ds_unique_bytes = 1003 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1004 1005 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1006 SPA_VERSION_UNIQUE_ACCURATE) 1007 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1008} 1009 1010void 1011dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1012 dmu_tx_t *tx) 1013{ 1014 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1015 uint64_t count; 1016 int err; 1017 1018 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1019 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1020 obj, tx); 1021 /* 1022 * The err should not be ENOENT, but a bug in a previous version 1023 * of the code could cause upgrade_clones_cb() to not set 1024 * ds_next_snap_obj when it should, leading to a missing entry. 1025 * If we knew that the pool was created after 1026 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1027 * ENOENT. However, at least we can check that we don't have 1028 * too many entries in the next_clones_obj even after failing to 1029 * remove this one. 1030 */ 1031 if (err != ENOENT) 1032 VERIFY0(err); 1033 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1034 &count)); 1035 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1036} 1037 1038 1039blkptr_t * 1040dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1041{ 1042 return (&dsl_dataset_phys(ds)->ds_bp); 1043} 1044 1045void 1046dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1047{ 1048 ASSERT(dmu_tx_is_syncing(tx)); 1049 /* If it's the meta-objset, set dp_meta_rootbp */ 1050 if (ds == NULL) { 1051 tx->tx_pool->dp_meta_rootbp = *bp; 1052 } else { 1053 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1054 dsl_dataset_phys(ds)->ds_bp = *bp; 1055 } 1056} 1057 1058spa_t * 1059dsl_dataset_get_spa(dsl_dataset_t *ds) 1060{ 1061 return (ds->ds_dir->dd_pool->dp_spa); 1062} 1063 1064void 1065dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1066{ 1067 dsl_pool_t *dp; 1068 1069 if (ds == NULL) /* this is the meta-objset */ 1070 return; 1071 1072 ASSERT(ds->ds_objset != NULL); 1073 1074 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1075 panic("dirtying snapshot!"); 1076 1077 dp = ds->ds_dir->dd_pool; 1078 1079 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1080 /* up the hold count until we can be written out */ 1081 dmu_buf_add_ref(ds->ds_dbuf, ds); 1082 } 1083} 1084 1085boolean_t 1086dsl_dataset_is_dirty(dsl_dataset_t *ds) 1087{ 1088 for (int t = 0; t < TXG_SIZE; t++) { 1089 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1090 ds, t)) 1091 return (B_TRUE); 1092 } 1093 return (B_FALSE); 1094} 1095 1096static int 1097dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1098{ 1099 uint64_t asize; 1100 1101 if (!dmu_tx_is_syncing(tx)) 1102 return (0); 1103 1104 /* 1105 * If there's an fs-only reservation, any blocks that might become 1106 * owned by the snapshot dataset must be accommodated by space 1107 * outside of the reservation. 1108 */ 1109 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1110 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1111 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1112 return (SET_ERROR(ENOSPC)); 1113 1114 /* 1115 * Propagate any reserved space for this snapshot to other 1116 * snapshot checks in this sync group. 1117 */ 1118 if (asize > 0) 1119 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1120 1121 return (0); 1122} 1123 1124typedef struct dsl_dataset_snapshot_arg { 1125 nvlist_t *ddsa_snaps; 1126 nvlist_t *ddsa_props; 1127 nvlist_t *ddsa_errors; 1128 cred_t *ddsa_cr; 1129} dsl_dataset_snapshot_arg_t; 1130 1131int 1132dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1133 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1134{ 1135 int error; 1136 uint64_t value; 1137 1138 ds->ds_trysnap_txg = tx->tx_txg; 1139 1140 if (!dmu_tx_is_syncing(tx)) 1141 return (0); 1142 1143 /* 1144 * We don't allow multiple snapshots of the same txg. If there 1145 * is already one, try again. 1146 */ 1147 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1148 return (SET_ERROR(EAGAIN)); 1149 1150 /* 1151 * Check for conflicting snapshot name. 1152 */ 1153 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1154 if (error == 0) 1155 return (SET_ERROR(EEXIST)); 1156 if (error != ENOENT) 1157 return (error); 1158 1159 /* 1160 * We don't allow taking snapshots of inconsistent datasets, such as 1161 * those into which we are currently receiving. However, if we are 1162 * creating this snapshot as part of a receive, this check will be 1163 * executed atomically with respect to the completion of the receive 1164 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1165 * case we ignore this, knowing it will be fixed up for us shortly in 1166 * dmu_recv_end_sync(). 1167 */ 1168 if (!recv && DS_IS_INCONSISTENT(ds)) 1169 return (SET_ERROR(EBUSY)); 1170 1171 /* 1172 * Skip the check for temporary snapshots or if we have already checked 1173 * the counts in dsl_dataset_snapshot_check. This means we really only 1174 * check the count here when we're receiving a stream. 1175 */ 1176 if (cnt != 0 && cr != NULL) { 1177 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1178 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1179 if (error != 0) 1180 return (error); 1181 } 1182 1183 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1184 if (error != 0) 1185 return (error); 1186 1187 return (0); 1188} 1189 1190static int 1191dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1192{ 1193 dsl_dataset_snapshot_arg_t *ddsa = arg; 1194 dsl_pool_t *dp = dmu_tx_pool(tx); 1195 nvpair_t *pair; 1196 int rv = 0; 1197 1198 /* 1199 * Pre-compute how many total new snapshots will be created for each 1200 * level in the tree and below. This is needed for validating the 1201 * snapshot limit when either taking a recursive snapshot or when 1202 * taking multiple snapshots. 1203 * 1204 * The problem is that the counts are not actually adjusted when 1205 * we are checking, only when we finally sync. For a single snapshot, 1206 * this is easy, the count will increase by 1 at each node up the tree, 1207 * but its more complicated for the recursive/multiple snapshot case. 1208 * 1209 * The dsl_fs_ss_limit_check function does recursively check the count 1210 * at each level up the tree but since it is validating each snapshot 1211 * independently we need to be sure that we are validating the complete 1212 * count for the entire set of snapshots. We do this by rolling up the 1213 * counts for each component of the name into an nvlist and then 1214 * checking each of those cases with the aggregated count. 1215 * 1216 * This approach properly handles not only the recursive snapshot 1217 * case (where we get all of those on the ddsa_snaps list) but also 1218 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1219 * validate the limit on 'a' using a count of 2). 1220 * 1221 * We validate the snapshot names in the third loop and only report 1222 * name errors once. 1223 */ 1224 if (dmu_tx_is_syncing(tx)) { 1225 nvlist_t *cnt_track = NULL; 1226 cnt_track = fnvlist_alloc(); 1227 1228 /* Rollup aggregated counts into the cnt_track list */ 1229 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1230 pair != NULL; 1231 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1232 char *pdelim; 1233 uint64_t val; 1234 char nm[MAXPATHLEN]; 1235 1236 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1237 pdelim = strchr(nm, '@'); 1238 if (pdelim == NULL) 1239 continue; 1240 *pdelim = '\0'; 1241 1242 do { 1243 if (nvlist_lookup_uint64(cnt_track, nm, 1244 &val) == 0) { 1245 /* update existing entry */ 1246 fnvlist_add_uint64(cnt_track, nm, 1247 val + 1); 1248 } else { 1249 /* add to list */ 1250 fnvlist_add_uint64(cnt_track, nm, 1); 1251 } 1252 1253 pdelim = strrchr(nm, '/'); 1254 if (pdelim != NULL) 1255 *pdelim = '\0'; 1256 } while (pdelim != NULL); 1257 } 1258 1259 /* Check aggregated counts at each level */ 1260 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1261 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1262 int error = 0; 1263 char *name; 1264 uint64_t cnt = 0; 1265 dsl_dataset_t *ds; 1266 1267 name = nvpair_name(pair); 1268 cnt = fnvpair_value_uint64(pair); 1269 ASSERT(cnt > 0); 1270 1271 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1272 if (error == 0) { 1273 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1274 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1275 ddsa->ddsa_cr); 1276 dsl_dataset_rele(ds, FTAG); 1277 } 1278 1279 if (error != 0) { 1280 if (ddsa->ddsa_errors != NULL) 1281 fnvlist_add_int32(ddsa->ddsa_errors, 1282 name, error); 1283 rv = error; 1284 /* only report one error for this check */ 1285 break; 1286 } 1287 } 1288 nvlist_free(cnt_track); 1289 } 1290 1291 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1292 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1293 int error = 0; 1294 dsl_dataset_t *ds; 1295 char *name, *atp; 1296 char dsname[MAXNAMELEN]; 1297 1298 name = nvpair_name(pair); 1299 if (strlen(name) >= MAXNAMELEN) 1300 error = SET_ERROR(ENAMETOOLONG); 1301 if (error == 0) { 1302 atp = strchr(name, '@'); 1303 if (atp == NULL) 1304 error = SET_ERROR(EINVAL); 1305 if (error == 0) 1306 (void) strlcpy(dsname, name, atp - name + 1); 1307 } 1308 if (error == 0) 1309 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1310 if (error == 0) { 1311 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1312 error = dsl_dataset_snapshot_check_impl(ds, 1313 atp + 1, tx, B_FALSE, 0, NULL); 1314 dsl_dataset_rele(ds, FTAG); 1315 } 1316 1317 if (error != 0) { 1318 if (ddsa->ddsa_errors != NULL) { 1319 fnvlist_add_int32(ddsa->ddsa_errors, 1320 name, error); 1321 } 1322 rv = error; 1323 } 1324 } 1325 1326 return (rv); 1327} 1328 1329void 1330dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1331 dmu_tx_t *tx) 1332{ 1333 static zil_header_t zero_zil; 1334 1335 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1336 dmu_buf_t *dbuf; 1337 dsl_dataset_phys_t *dsphys; 1338 uint64_t dsobj, crtxg; 1339 objset_t *mos = dp->dp_meta_objset; 1340 objset_t *os; 1341 1342 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1343 1344 /* 1345 * If we are on an old pool, the zil must not be active, in which 1346 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1347 */ 1348 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1349 dmu_objset_from_ds(ds, &os) != 0 || 1350 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1351 sizeof (zero_zil)) == 0); 1352 1353 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1354 1355 /* 1356 * The origin's ds_creation_txg has to be < TXG_INITIAL 1357 */ 1358 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1359 crtxg = 1; 1360 else 1361 crtxg = tx->tx_txg; 1362 1363 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1364 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1365 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1366 dmu_buf_will_dirty(dbuf, tx); 1367 dsphys = dbuf->db_data; 1368 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1369 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1370 dsphys->ds_fsid_guid = unique_create(); 1371 do { 1372 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1373 sizeof (dsphys->ds_guid)); 1374 } while (dsphys->ds_guid == 0); 1375 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1376 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1377 dsphys->ds_next_snap_obj = ds->ds_object; 1378 dsphys->ds_num_children = 1; 1379 dsphys->ds_creation_time = gethrestime_sec(); 1380 dsphys->ds_creation_txg = crtxg; 1381 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1382 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1383 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1384 dsphys->ds_uncompressed_bytes = 1385 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1386 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1387 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1388 dmu_buf_rele(dbuf, FTAG); 1389 1390 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1391 if (ds->ds_feature_inuse[f]) 1392 dsl_dataset_activate_feature(dsobj, f, tx); 1393 } 1394 1395 ASSERT3U(ds->ds_prev != 0, ==, 1396 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1397 if (ds->ds_prev) { 1398 uint64_t next_clones_obj = 1399 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1400 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1401 ds->ds_object || 1402 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1403 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1404 ds->ds_object) { 1405 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1406 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1407 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1408 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1409 } else if (next_clones_obj != 0) { 1410 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1411 dsphys->ds_next_snap_obj, tx); 1412 VERIFY0(zap_add_int(mos, 1413 next_clones_obj, dsobj, tx)); 1414 } 1415 } 1416 1417 /* 1418 * If we have a reference-reservation on this dataset, we will 1419 * need to increase the amount of refreservation being charged 1420 * since our unique space is going to zero. 1421 */ 1422 if (ds->ds_reserved) { 1423 int64_t delta; 1424 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1425 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1426 ds->ds_reserved); 1427 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1428 delta, 0, 0, tx); 1429 } 1430 1431 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1432 dsl_dataset_phys(ds)->ds_deadlist_obj = 1433 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1434 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1435 dsl_deadlist_close(&ds->ds_deadlist); 1436 dsl_deadlist_open(&ds->ds_deadlist, mos, 1437 dsl_dataset_phys(ds)->ds_deadlist_obj); 1438 dsl_deadlist_add_key(&ds->ds_deadlist, 1439 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1440 1441 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1442 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1443 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1444 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1445 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1446 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1447 1448 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1449 snapname, 8, 1, &dsobj, tx)); 1450 1451 if (ds->ds_prev) 1452 dsl_dataset_rele(ds->ds_prev, ds); 1453 VERIFY0(dsl_dataset_hold_obj(dp, 1454 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1455 1456 dsl_scan_ds_snapshotted(ds, tx); 1457 1458 dsl_dir_snap_cmtime_update(ds->ds_dir); 1459 1460 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1461} 1462 1463static void 1464dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1465{ 1466 dsl_dataset_snapshot_arg_t *ddsa = arg; 1467 dsl_pool_t *dp = dmu_tx_pool(tx); 1468 nvpair_t *pair; 1469 1470 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1471 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1472 dsl_dataset_t *ds; 1473 char *name, *atp; 1474 char dsname[MAXNAMELEN]; 1475 1476 name = nvpair_name(pair); 1477 atp = strchr(name, '@'); 1478 (void) strlcpy(dsname, name, atp - name + 1); 1479 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1480 1481 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1482 if (ddsa->ddsa_props != NULL) { 1483 dsl_props_set_sync_impl(ds->ds_prev, 1484 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1485 } 1486 dsl_dataset_rele(ds, FTAG); 1487 } 1488} 1489 1490/* 1491 * The snapshots must all be in the same pool. 1492 * All-or-nothing: if there are any failures, nothing will be modified. 1493 */ 1494int 1495dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1496{ 1497 dsl_dataset_snapshot_arg_t ddsa; 1498 nvpair_t *pair; 1499 boolean_t needsuspend; 1500 int error; 1501 spa_t *spa; 1502 char *firstname; 1503 nvlist_t *suspended = NULL; 1504 1505 pair = nvlist_next_nvpair(snaps, NULL); 1506 if (pair == NULL) 1507 return (0); 1508 firstname = nvpair_name(pair); 1509 1510 error = spa_open(firstname, &spa, FTAG); 1511 if (error != 0) 1512 return (error); 1513 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1514 spa_close(spa, FTAG); 1515 1516 if (needsuspend) { 1517 suspended = fnvlist_alloc(); 1518 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1519 pair = nvlist_next_nvpair(snaps, pair)) { 1520 char fsname[MAXNAMELEN]; 1521 char *snapname = nvpair_name(pair); 1522 char *atp; 1523 void *cookie; 1524 1525 atp = strchr(snapname, '@'); 1526 if (atp == NULL) { 1527 error = SET_ERROR(EINVAL); 1528 break; 1529 } 1530 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1531 1532 error = zil_suspend(fsname, &cookie); 1533 if (error != 0) 1534 break; 1535 fnvlist_add_uint64(suspended, fsname, 1536 (uintptr_t)cookie); 1537 } 1538 } 1539 1540 ddsa.ddsa_snaps = snaps; 1541 ddsa.ddsa_props = props; 1542 ddsa.ddsa_errors = errors; 1543 ddsa.ddsa_cr = CRED(); 1544 1545 if (error == 0) { 1546 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1547 dsl_dataset_snapshot_sync, &ddsa, 1548 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1549 } 1550 1551 if (suspended != NULL) { 1552 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1553 pair = nvlist_next_nvpair(suspended, pair)) { 1554 zil_resume((void *)(uintptr_t) 1555 fnvpair_value_uint64(pair)); 1556 } 1557 fnvlist_free(suspended); 1558 } 1559 1560#ifdef __FreeBSD__ 1561#ifdef _KERNEL 1562 if (error == 0) { 1563 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1564 pair = nvlist_next_nvpair(snaps, pair)) { 1565 char *snapname = nvpair_name(pair); 1566 zvol_create_minors(snapname); 1567 } 1568 } 1569#endif 1570#endif 1571 return (error); 1572} 1573 1574typedef struct dsl_dataset_snapshot_tmp_arg { 1575 const char *ddsta_fsname; 1576 const char *ddsta_snapname; 1577 minor_t ddsta_cleanup_minor; 1578 const char *ddsta_htag; 1579} dsl_dataset_snapshot_tmp_arg_t; 1580 1581static int 1582dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1583{ 1584 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1585 dsl_pool_t *dp = dmu_tx_pool(tx); 1586 dsl_dataset_t *ds; 1587 int error; 1588 1589 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1590 if (error != 0) 1591 return (error); 1592 1593 /* NULL cred means no limit check for tmp snapshot */ 1594 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1595 tx, B_FALSE, 0, NULL); 1596 if (error != 0) { 1597 dsl_dataset_rele(ds, FTAG); 1598 return (error); 1599 } 1600 1601 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1602 dsl_dataset_rele(ds, FTAG); 1603 return (SET_ERROR(ENOTSUP)); 1604 } 1605 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1606 B_TRUE, tx); 1607 if (error != 0) { 1608 dsl_dataset_rele(ds, FTAG); 1609 return (error); 1610 } 1611 1612 dsl_dataset_rele(ds, FTAG); 1613 return (0); 1614} 1615 1616static void 1617dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1618{ 1619 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1620 dsl_pool_t *dp = dmu_tx_pool(tx); 1621 dsl_dataset_t *ds; 1622 1623 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1624 1625 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1626 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1627 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1628 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1629 1630 dsl_dataset_rele(ds, FTAG); 1631} 1632 1633int 1634dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1635 minor_t cleanup_minor, const char *htag) 1636{ 1637 dsl_dataset_snapshot_tmp_arg_t ddsta; 1638 int error; 1639 spa_t *spa; 1640 boolean_t needsuspend; 1641 void *cookie; 1642 1643 ddsta.ddsta_fsname = fsname; 1644 ddsta.ddsta_snapname = snapname; 1645 ddsta.ddsta_cleanup_minor = cleanup_minor; 1646 ddsta.ddsta_htag = htag; 1647 1648 error = spa_open(fsname, &spa, FTAG); 1649 if (error != 0) 1650 return (error); 1651 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1652 spa_close(spa, FTAG); 1653 1654 if (needsuspend) { 1655 error = zil_suspend(fsname, &cookie); 1656 if (error != 0) 1657 return (error); 1658 } 1659 1660 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1661 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1662 1663 if (needsuspend) 1664 zil_resume(cookie); 1665 return (error); 1666} 1667 1668 1669void 1670dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1671{ 1672 ASSERT(dmu_tx_is_syncing(tx)); 1673 ASSERT(ds->ds_objset != NULL); 1674 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1675 1676 /* 1677 * in case we had to change ds_fsid_guid when we opened it, 1678 * sync it out now. 1679 */ 1680 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1681 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1682 1683 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1684 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1685 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1686 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1687 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1688 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1689 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1690 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1691 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1692 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1693 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1694 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1695 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1696 } 1697 1698 dmu_objset_sync(ds->ds_objset, zio, tx); 1699 1700 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1701 if (ds->ds_feature_activation_needed[f]) { 1702 if (ds->ds_feature_inuse[f]) 1703 continue; 1704 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1705 ds->ds_feature_inuse[f] = B_TRUE; 1706 } 1707 } 1708} 1709 1710static void 1711get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1712{ 1713 uint64_t count = 0; 1714 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1715 zap_cursor_t zc; 1716 zap_attribute_t za; 1717 nvlist_t *propval = fnvlist_alloc(); 1718 nvlist_t *val = fnvlist_alloc(); 1719 1720 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1721 1722 /* 1723 * There may be missing entries in ds_next_clones_obj 1724 * due to a bug in a previous version of the code. 1725 * Only trust it if it has the right number of entries. 1726 */ 1727 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1728 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1729 &count)); 1730 } 1731 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1732 goto fail; 1733 for (zap_cursor_init(&zc, mos, 1734 dsl_dataset_phys(ds)->ds_next_clones_obj); 1735 zap_cursor_retrieve(&zc, &za) == 0; 1736 zap_cursor_advance(&zc)) { 1737 dsl_dataset_t *clone; 1738 char buf[ZFS_MAXNAMELEN]; 1739 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1740 za.za_first_integer, FTAG, &clone)); 1741 dsl_dir_name(clone->ds_dir, buf); 1742 fnvlist_add_boolean(val, buf); 1743 dsl_dataset_rele(clone, FTAG); 1744 } 1745 zap_cursor_fini(&zc); 1746 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1747 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1748fail: 1749 nvlist_free(val); 1750 nvlist_free(propval); 1751} 1752 1753static void 1754get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1755{ 1756 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1757 1758 if (dsl_dataset_has_resume_receive_state(ds)) { 1759 char *str; 1760 void *packed; 1761 uint8_t *compressed; 1762 uint64_t val; 1763 nvlist_t *token_nv = fnvlist_alloc(); 1764 size_t packed_size, compressed_size; 1765 1766 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1767 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1768 fnvlist_add_uint64(token_nv, "fromguid", val); 1769 } 1770 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1771 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1772 fnvlist_add_uint64(token_nv, "object", val); 1773 } 1774 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1775 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1776 fnvlist_add_uint64(token_nv, "offset", val); 1777 } 1778 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1779 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1780 fnvlist_add_uint64(token_nv, "bytes", val); 1781 } 1782 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1783 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1784 fnvlist_add_uint64(token_nv, "toguid", val); 1785 } 1786 char buf[256]; 1787 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1788 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1789 fnvlist_add_string(token_nv, "toname", buf); 1790 } 1791 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1792 DS_FIELD_RESUME_EMBEDOK) == 0) { 1793 fnvlist_add_boolean(token_nv, "embedok"); 1794 } 1795 packed = fnvlist_pack(token_nv, &packed_size); 1796 fnvlist_free(token_nv); 1797 compressed = kmem_alloc(packed_size, KM_SLEEP); 1798 1799 compressed_size = gzip_compress(packed, compressed, 1800 packed_size, packed_size, 6); 1801 1802 zio_cksum_t cksum; 1803 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1804 1805 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1806 for (int i = 0; i < compressed_size; i++) { 1807 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1808 } 1809 str[compressed_size * 2] = '\0'; 1810 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1811 ZFS_SEND_RESUME_TOKEN_VERSION, 1812 (longlong_t)cksum.zc_word[0], 1813 (longlong_t)packed_size, str); 1814 dsl_prop_nvlist_add_string(nv, 1815 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1816 kmem_free(packed, packed_size); 1817 kmem_free(str, compressed_size * 2 + 1); 1818 kmem_free(compressed, packed_size); 1819 strfree(propval); 1820 } 1821} 1822 1823void 1824dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1825{ 1826 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1827 uint64_t refd, avail, uobjs, aobjs, ratio; 1828 1829 ASSERT(dsl_pool_config_held(dp)); 1830 1831 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1832 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1833 dsl_dataset_phys(ds)->ds_compressed_bytes); 1834 1835 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1836 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1837 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1838 1839 if (ds->ds_is_snapshot) { 1840 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1841 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1842 dsl_dataset_phys(ds)->ds_unique_bytes); 1843 get_clones_stat(ds, nv); 1844 } else { 1845 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1846 char buf[MAXNAMELEN]; 1847 dsl_dataset_name(ds->ds_prev, buf); 1848 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1849 } 1850 1851 dsl_dir_stats(ds->ds_dir, nv); 1852 } 1853 1854 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1855 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1856 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1857 1858 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1859 dsl_dataset_phys(ds)->ds_creation_time); 1860 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1861 dsl_dataset_phys(ds)->ds_creation_txg); 1862 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1863 ds->ds_quota); 1864 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1865 ds->ds_reserved); 1866 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1867 dsl_dataset_phys(ds)->ds_guid); 1868 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1869 dsl_dataset_phys(ds)->ds_unique_bytes); 1870 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1871 ds->ds_object); 1872 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1873 ds->ds_userrefs); 1874 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1875 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1876 1877 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1878 uint64_t written, comp, uncomp; 1879 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1880 dsl_dataset_t *prev; 1881 1882 int err = dsl_dataset_hold_obj(dp, 1883 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1884 if (err == 0) { 1885 err = dsl_dataset_space_written(prev, ds, &written, 1886 &comp, &uncomp); 1887 dsl_dataset_rele(prev, FTAG); 1888 if (err == 0) { 1889 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1890 written); 1891 } 1892 } 1893 } 1894 1895 if (!dsl_dataset_is_snapshot(ds)) { 1896 /* 1897 * A failed "newfs" (e.g. full) resumable receive leaves 1898 * the stats set on this dataset. Check here for the prop. 1899 */ 1900 get_receive_resume_stats(ds, nv); 1901 1902 /* 1903 * A failed incremental resumable receive leaves the 1904 * stats set on our child named "%recv". Check the child 1905 * for the prop. 1906 */ 1907 char recvname[ZFS_MAXNAMELEN]; 1908 dsl_dataset_t *recv_ds; 1909 dsl_dataset_name(ds, recvname); 1910 (void) strcat(recvname, "/"); 1911 (void) strcat(recvname, recv_clone_name); 1912 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1913 get_receive_resume_stats(recv_ds, nv); 1914 dsl_dataset_rele(recv_ds, FTAG); 1915 } 1916 } 1917} 1918 1919void 1920dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1921{ 1922 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1923 ASSERT(dsl_pool_config_held(dp)); 1924 1925 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1926 stat->dds_inconsistent = 1927 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1928 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1929 stat->dds_origin[0] = '\0'; 1930 if (ds->ds_is_snapshot) { 1931 stat->dds_is_snapshot = B_TRUE; 1932 stat->dds_num_clones = 1933 dsl_dataset_phys(ds)->ds_num_children - 1; 1934 } else { 1935 stat->dds_is_snapshot = B_FALSE; 1936 stat->dds_num_clones = 0; 1937 1938 if (dsl_dir_is_clone(ds->ds_dir)) { 1939 dsl_dataset_t *ods; 1940 1941 VERIFY0(dsl_dataset_hold_obj(dp, 1942 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1943 FTAG, &ods)); 1944 dsl_dataset_name(ods, stat->dds_origin); 1945 dsl_dataset_rele(ods, FTAG); 1946 } 1947 } 1948} 1949 1950uint64_t 1951dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1952{ 1953 return (ds->ds_fsid_guid); 1954} 1955 1956void 1957dsl_dataset_space(dsl_dataset_t *ds, 1958 uint64_t *refdbytesp, uint64_t *availbytesp, 1959 uint64_t *usedobjsp, uint64_t *availobjsp) 1960{ 1961 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1962 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1963 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1964 *availbytesp += 1965 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1966 if (ds->ds_quota != 0) { 1967 /* 1968 * Adjust available bytes according to refquota 1969 */ 1970 if (*refdbytesp < ds->ds_quota) 1971 *availbytesp = MIN(*availbytesp, 1972 ds->ds_quota - *refdbytesp); 1973 else 1974 *availbytesp = 0; 1975 } 1976 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1977 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1978} 1979 1980boolean_t 1981dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1982{ 1983 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1984 1985 ASSERT(dsl_pool_config_held(dp)); 1986 if (snap == NULL) 1987 return (B_FALSE); 1988 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1989 dsl_dataset_phys(snap)->ds_creation_txg) { 1990 objset_t *os, *os_snap; 1991 /* 1992 * It may be that only the ZIL differs, because it was 1993 * reset in the head. Don't count that as being 1994 * modified. 1995 */ 1996 if (dmu_objset_from_ds(ds, &os) != 0) 1997 return (B_TRUE); 1998 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1999 return (B_TRUE); 2000 return (bcmp(&os->os_phys->os_meta_dnode, 2001 &os_snap->os_phys->os_meta_dnode, 2002 sizeof (os->os_phys->os_meta_dnode)) != 0); 2003 } 2004 return (B_FALSE); 2005} 2006 2007typedef struct dsl_dataset_rename_snapshot_arg { 2008 const char *ddrsa_fsname; 2009 const char *ddrsa_oldsnapname; 2010 const char *ddrsa_newsnapname; 2011 boolean_t ddrsa_recursive; 2012 dmu_tx_t *ddrsa_tx; 2013} dsl_dataset_rename_snapshot_arg_t; 2014 2015/* ARGSUSED */ 2016static int 2017dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2018 dsl_dataset_t *hds, void *arg) 2019{ 2020 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2021 int error; 2022 uint64_t val; 2023 2024 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2025 if (error != 0) { 2026 /* ignore nonexistent snapshots */ 2027 return (error == ENOENT ? 0 : error); 2028 } 2029 2030 /* new name should not exist */ 2031 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2032 if (error == 0) 2033 error = SET_ERROR(EEXIST); 2034 else if (error == ENOENT) 2035 error = 0; 2036 2037 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2038 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2039 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 2040 error = SET_ERROR(ENAMETOOLONG); 2041 2042 return (error); 2043} 2044 2045static int 2046dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2047{ 2048 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2049 dsl_pool_t *dp = dmu_tx_pool(tx); 2050 dsl_dataset_t *hds; 2051 int error; 2052 2053 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2054 if (error != 0) 2055 return (error); 2056 2057 if (ddrsa->ddrsa_recursive) { 2058 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2059 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2060 DS_FIND_CHILDREN); 2061 } else { 2062 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2063 } 2064 dsl_dataset_rele(hds, FTAG); 2065 return (error); 2066} 2067 2068static int 2069dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2070 dsl_dataset_t *hds, void *arg) 2071{ 2072#ifdef __FreeBSD__ 2073#ifdef _KERNEL 2074 char *oldname, *newname; 2075#endif 2076#endif 2077 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2078 dsl_dataset_t *ds; 2079 uint64_t val; 2080 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2081 int error; 2082 2083 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2084 ASSERT(error == 0 || error == ENOENT); 2085 if (error == ENOENT) { 2086 /* ignore nonexistent snapshots */ 2087 return (0); 2088 } 2089 2090 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2091 2092 /* log before we change the name */ 2093 spa_history_log_internal_ds(ds, "rename", tx, 2094 "-> @%s", ddrsa->ddrsa_newsnapname); 2095 2096 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2097 B_FALSE)); 2098 mutex_enter(&ds->ds_lock); 2099 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2100 mutex_exit(&ds->ds_lock); 2101 VERIFY0(zap_add(dp->dp_meta_objset, 2102 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2103 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2104 2105#ifdef __FreeBSD__ 2106#ifdef _KERNEL 2107 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2108 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2109 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2110 ddrsa->ddrsa_oldsnapname); 2111 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2112 ddrsa->ddrsa_newsnapname); 2113 zfsvfs_update_fromname(oldname, newname); 2114 zvol_rename_minors(oldname, newname); 2115 kmem_free(newname, MAXPATHLEN); 2116 kmem_free(oldname, MAXPATHLEN); 2117#endif 2118#endif 2119 dsl_dataset_rele(ds, FTAG); 2120 2121 return (0); 2122} 2123 2124static void 2125dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2126{ 2127 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2128 dsl_pool_t *dp = dmu_tx_pool(tx); 2129 dsl_dataset_t *hds; 2130 2131 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2132 ddrsa->ddrsa_tx = tx; 2133 if (ddrsa->ddrsa_recursive) { 2134 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2135 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2136 DS_FIND_CHILDREN)); 2137 } else { 2138 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2139 } 2140 dsl_dataset_rele(hds, FTAG); 2141} 2142 2143int 2144dsl_dataset_rename_snapshot(const char *fsname, 2145 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2146{ 2147 dsl_dataset_rename_snapshot_arg_t ddrsa; 2148 2149 ddrsa.ddrsa_fsname = fsname; 2150 ddrsa.ddrsa_oldsnapname = oldsnapname; 2151 ddrsa.ddrsa_newsnapname = newsnapname; 2152 ddrsa.ddrsa_recursive = recursive; 2153 2154 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2155 dsl_dataset_rename_snapshot_sync, &ddrsa, 2156 1, ZFS_SPACE_CHECK_RESERVED)); 2157} 2158 2159/* 2160 * If we're doing an ownership handoff, we need to make sure that there is 2161 * only one long hold on the dataset. We're not allowed to change anything here 2162 * so we don't permanently release the long hold or regular hold here. We want 2163 * to do this only when syncing to avoid the dataset unexpectedly going away 2164 * when we release the long hold. 2165 */ 2166static int 2167dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2168{ 2169 boolean_t held; 2170 2171 if (!dmu_tx_is_syncing(tx)) 2172 return (0); 2173 2174 if (owner != NULL) { 2175 VERIFY3P(ds->ds_owner, ==, owner); 2176 dsl_dataset_long_rele(ds, owner); 2177 } 2178 2179 held = dsl_dataset_long_held(ds); 2180 2181 if (owner != NULL) 2182 dsl_dataset_long_hold(ds, owner); 2183 2184 if (held) 2185 return (SET_ERROR(EBUSY)); 2186 2187 return (0); 2188} 2189 2190typedef struct dsl_dataset_rollback_arg { 2191 const char *ddra_fsname; 2192 void *ddra_owner; 2193 nvlist_t *ddra_result; 2194} dsl_dataset_rollback_arg_t; 2195 2196static int 2197dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2198{ 2199 dsl_dataset_rollback_arg_t *ddra = arg; 2200 dsl_pool_t *dp = dmu_tx_pool(tx); 2201 dsl_dataset_t *ds; 2202 int64_t unused_refres_delta; 2203 int error; 2204 2205 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2206 if (error != 0) 2207 return (error); 2208 2209 /* must not be a snapshot */ 2210 if (ds->ds_is_snapshot) { 2211 dsl_dataset_rele(ds, FTAG); 2212 return (SET_ERROR(EINVAL)); 2213 } 2214 2215 /* must have a most recent snapshot */ 2216 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2217 dsl_dataset_rele(ds, FTAG); 2218 return (SET_ERROR(EINVAL)); 2219 } 2220 2221 /* must not have any bookmarks after the most recent snapshot */ 2222 nvlist_t *proprequest = fnvlist_alloc(); 2223 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2224 nvlist_t *bookmarks = fnvlist_alloc(); 2225 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2226 fnvlist_free(proprequest); 2227 if (error != 0) 2228 return (error); 2229 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2230 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2231 nvlist_t *valuenv = 2232 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2233 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2234 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2235 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2236 fnvlist_free(bookmarks); 2237 dsl_dataset_rele(ds, FTAG); 2238 return (SET_ERROR(EEXIST)); 2239 } 2240 } 2241 fnvlist_free(bookmarks); 2242 2243 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2244 if (error != 0) { 2245 dsl_dataset_rele(ds, FTAG); 2246 return (error); 2247 } 2248 2249 /* 2250 * Check if the snap we are rolling back to uses more than 2251 * the refquota. 2252 */ 2253 if (ds->ds_quota != 0 && 2254 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2255 dsl_dataset_rele(ds, FTAG); 2256 return (SET_ERROR(EDQUOT)); 2257 } 2258 2259 /* 2260 * When we do the clone swap, we will temporarily use more space 2261 * due to the refreservation (the head will no longer have any 2262 * unique space, so the entire amount of the refreservation will need 2263 * to be free). We will immediately destroy the clone, freeing 2264 * this space, but the freeing happens over many txg's. 2265 */ 2266 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2267 dsl_dataset_phys(ds)->ds_unique_bytes); 2268 2269 if (unused_refres_delta > 0 && 2270 unused_refres_delta > 2271 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2272 dsl_dataset_rele(ds, FTAG); 2273 return (SET_ERROR(ENOSPC)); 2274 } 2275 2276 dsl_dataset_rele(ds, FTAG); 2277 return (0); 2278} 2279 2280static void 2281dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2282{ 2283 dsl_dataset_rollback_arg_t *ddra = arg; 2284 dsl_pool_t *dp = dmu_tx_pool(tx); 2285 dsl_dataset_t *ds, *clone; 2286 uint64_t cloneobj; 2287 char namebuf[ZFS_MAXNAMELEN]; 2288 2289 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2290 2291 dsl_dataset_name(ds->ds_prev, namebuf); 2292 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2293 2294 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2295 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2296 2297 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2298 2299 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2300 dsl_dataset_zero_zil(ds, tx); 2301 2302 dsl_destroy_head_sync_impl(clone, tx); 2303 2304 dsl_dataset_rele(clone, FTAG); 2305 dsl_dataset_rele(ds, FTAG); 2306} 2307 2308/* 2309 * Rolls back the given filesystem or volume to the most recent snapshot. 2310 * The name of the most recent snapshot will be returned under key "target" 2311 * in the result nvlist. 2312 * 2313 * If owner != NULL: 2314 * - The existing dataset MUST be owned by the specified owner at entry 2315 * - Upon return, dataset will still be held by the same owner, whether we 2316 * succeed or not. 2317 * 2318 * This mode is required any time the existing filesystem is mounted. See 2319 * notes above zfs_suspend_fs() for further details. 2320 */ 2321int 2322dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2323{ 2324 dsl_dataset_rollback_arg_t ddra; 2325 2326 ddra.ddra_fsname = fsname; 2327 ddra.ddra_owner = owner; 2328 ddra.ddra_result = result; 2329 2330 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2331 dsl_dataset_rollback_sync, &ddra, 2332 1, ZFS_SPACE_CHECK_RESERVED)); 2333} 2334 2335struct promotenode { 2336 list_node_t link; 2337 dsl_dataset_t *ds; 2338}; 2339 2340typedef struct dsl_dataset_promote_arg { 2341 const char *ddpa_clonename; 2342 dsl_dataset_t *ddpa_clone; 2343 list_t shared_snaps, origin_snaps, clone_snaps; 2344 dsl_dataset_t *origin_origin; /* origin of the origin */ 2345 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2346 char *err_ds; 2347 cred_t *cr; 2348} dsl_dataset_promote_arg_t; 2349 2350static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2351static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2352 void *tag); 2353static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2354 2355static int 2356dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2357{ 2358 dsl_dataset_promote_arg_t *ddpa = arg; 2359 dsl_pool_t *dp = dmu_tx_pool(tx); 2360 dsl_dataset_t *hds; 2361 struct promotenode *snap; 2362 dsl_dataset_t *origin_ds; 2363 int err; 2364 uint64_t unused; 2365 uint64_t ss_mv_cnt; 2366 size_t max_snap_len; 2367 2368 err = promote_hold(ddpa, dp, FTAG); 2369 if (err != 0) 2370 return (err); 2371 2372 hds = ddpa->ddpa_clone; 2373 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2374 2375 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2376 promote_rele(ddpa, FTAG); 2377 return (SET_ERROR(EXDEV)); 2378 } 2379 2380 /* 2381 * Compute and check the amount of space to transfer. Since this is 2382 * so expensive, don't do the preliminary check. 2383 */ 2384 if (!dmu_tx_is_syncing(tx)) { 2385 promote_rele(ddpa, FTAG); 2386 return (0); 2387 } 2388 2389 snap = list_head(&ddpa->shared_snaps); 2390 origin_ds = snap->ds; 2391 2392 /* compute origin's new unique space */ 2393 snap = list_tail(&ddpa->clone_snaps); 2394 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2395 origin_ds->ds_object); 2396 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2397 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2398 &ddpa->unique, &unused, &unused); 2399 2400 /* 2401 * Walk the snapshots that we are moving 2402 * 2403 * Compute space to transfer. Consider the incremental changes 2404 * to used by each snapshot: 2405 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2406 * So each snapshot gave birth to: 2407 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2408 * So a sequence would look like: 2409 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2410 * Which simplifies to: 2411 * uN + kN + kN-1 + ... + k1 + k0 2412 * Note however, if we stop before we reach the ORIGIN we get: 2413 * uN + kN + kN-1 + ... + kM - uM-1 2414 */ 2415 ss_mv_cnt = 0; 2416 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2417 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2418 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2419 for (snap = list_head(&ddpa->shared_snaps); snap; 2420 snap = list_next(&ddpa->shared_snaps, snap)) { 2421 uint64_t val, dlused, dlcomp, dluncomp; 2422 dsl_dataset_t *ds = snap->ds; 2423 2424 ss_mv_cnt++; 2425 2426 /* 2427 * If there are long holds, we won't be able to evict 2428 * the objset. 2429 */ 2430 if (dsl_dataset_long_held(ds)) { 2431 err = SET_ERROR(EBUSY); 2432 goto out; 2433 } 2434 2435 /* Check that the snapshot name does not conflict */ 2436 VERIFY0(dsl_dataset_get_snapname(ds)); 2437 if (strlen(ds->ds_snapname) >= max_snap_len) { 2438 err = SET_ERROR(ENAMETOOLONG); 2439 goto out; 2440 } 2441 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2442 if (err == 0) { 2443 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2444 err = SET_ERROR(EEXIST); 2445 goto out; 2446 } 2447 if (err != ENOENT) 2448 goto out; 2449 2450 /* The very first snapshot does not have a deadlist */ 2451 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2452 continue; 2453 2454 dsl_deadlist_space(&ds->ds_deadlist, 2455 &dlused, &dlcomp, &dluncomp); 2456 ddpa->used += dlused; 2457 ddpa->comp += dlcomp; 2458 ddpa->uncomp += dluncomp; 2459 } 2460 2461 /* 2462 * If we are a clone of a clone then we never reached ORIGIN, 2463 * so we need to subtract out the clone origin's used space. 2464 */ 2465 if (ddpa->origin_origin) { 2466 ddpa->used -= 2467 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2468 ddpa->comp -= 2469 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2470 ddpa->uncomp -= 2471 dsl_dataset_phys(ddpa->origin_origin)-> 2472 ds_uncompressed_bytes; 2473 } 2474 2475 /* Check that there is enough space and limit headroom here */ 2476 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2477 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2478 if (err != 0) 2479 goto out; 2480 2481 /* 2482 * Compute the amounts of space that will be used by snapshots 2483 * after the promotion (for both origin and clone). For each, 2484 * it is the amount of space that will be on all of their 2485 * deadlists (that was not born before their new origin). 2486 */ 2487 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2488 uint64_t space; 2489 2490 /* 2491 * Note, typically this will not be a clone of a clone, 2492 * so dd_origin_txg will be < TXG_INITIAL, so 2493 * these snaplist_space() -> dsl_deadlist_space_range() 2494 * calls will be fast because they do not have to 2495 * iterate over all bps. 2496 */ 2497 snap = list_head(&ddpa->origin_snaps); 2498 err = snaplist_space(&ddpa->shared_snaps, 2499 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2500 if (err != 0) 2501 goto out; 2502 2503 err = snaplist_space(&ddpa->clone_snaps, 2504 snap->ds->ds_dir->dd_origin_txg, &space); 2505 if (err != 0) 2506 goto out; 2507 ddpa->cloneusedsnap += space; 2508 } 2509 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2510 DD_FLAG_USED_BREAKDOWN) { 2511 err = snaplist_space(&ddpa->origin_snaps, 2512 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2513 &ddpa->originusedsnap); 2514 if (err != 0) 2515 goto out; 2516 } 2517 2518out: 2519 promote_rele(ddpa, FTAG); 2520 return (err); 2521} 2522 2523static void 2524dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2525{ 2526 dsl_dataset_promote_arg_t *ddpa = arg; 2527 dsl_pool_t *dp = dmu_tx_pool(tx); 2528 dsl_dataset_t *hds; 2529 struct promotenode *snap; 2530 dsl_dataset_t *origin_ds; 2531 dsl_dataset_t *origin_head; 2532 dsl_dir_t *dd; 2533 dsl_dir_t *odd = NULL; 2534 uint64_t oldnext_obj; 2535 int64_t delta; 2536#if defined(__FreeBSD__) && defined(_KERNEL) 2537 char *oldname, *newname; 2538#endif 2539 2540 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2541 hds = ddpa->ddpa_clone; 2542 2543 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2544 2545 snap = list_head(&ddpa->shared_snaps); 2546 origin_ds = snap->ds; 2547 dd = hds->ds_dir; 2548 2549 snap = list_head(&ddpa->origin_snaps); 2550 origin_head = snap->ds; 2551 2552 /* 2553 * We need to explicitly open odd, since origin_ds's dd will be 2554 * changing. 2555 */ 2556 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2557 NULL, FTAG, &odd)); 2558 2559 /* change origin's next snap */ 2560 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2561 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2562 snap = list_tail(&ddpa->clone_snaps); 2563 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2564 origin_ds->ds_object); 2565 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2566 2567 /* change the origin's next clone */ 2568 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2569 dsl_dataset_remove_from_next_clones(origin_ds, 2570 snap->ds->ds_object, tx); 2571 VERIFY0(zap_add_int(dp->dp_meta_objset, 2572 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2573 oldnext_obj, tx)); 2574 } 2575 2576 /* change origin */ 2577 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2578 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2579 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2580 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2581 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2582 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2583 origin_head->ds_dir->dd_origin_txg = 2584 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2585 2586 /* change dd_clone entries */ 2587 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2588 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2589 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2590 VERIFY0(zap_add_int(dp->dp_meta_objset, 2591 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2592 hds->ds_object, tx)); 2593 2594 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2595 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2596 origin_head->ds_object, tx)); 2597 if (dsl_dir_phys(dd)->dd_clones == 0) { 2598 dsl_dir_phys(dd)->dd_clones = 2599 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2600 DMU_OT_NONE, 0, tx); 2601 } 2602 VERIFY0(zap_add_int(dp->dp_meta_objset, 2603 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2604 } 2605 2606#if defined(__FreeBSD__) && defined(_KERNEL) 2607 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2608 mutex_enter(&spa_namespace_lock); 2609 2610 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2611 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2612#endif 2613 2614 /* move snapshots to this dir */ 2615 for (snap = list_head(&ddpa->shared_snaps); snap; 2616 snap = list_next(&ddpa->shared_snaps, snap)) { 2617 dsl_dataset_t *ds = snap->ds; 2618 2619 /* 2620 * Property callbacks are registered to a particular 2621 * dsl_dir. Since ours is changing, evict the objset 2622 * so that they will be unregistered from the old dsl_dir. 2623 */ 2624 if (ds->ds_objset) { 2625 dmu_objset_evict(ds->ds_objset); 2626 ds->ds_objset = NULL; 2627 } 2628 2629 /* move snap name entry */ 2630 VERIFY0(dsl_dataset_get_snapname(ds)); 2631 VERIFY0(dsl_dataset_snap_remove(origin_head, 2632 ds->ds_snapname, tx, B_TRUE)); 2633 VERIFY0(zap_add(dp->dp_meta_objset, 2634 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2635 8, 1, &ds->ds_object, tx)); 2636 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2637 DD_FIELD_SNAPSHOT_COUNT, tx); 2638 2639 /* change containing dsl_dir */ 2640 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2641 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2642 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2643 ASSERT3P(ds->ds_dir, ==, odd); 2644 dsl_dir_rele(ds->ds_dir, ds); 2645 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2646 NULL, ds, &ds->ds_dir)); 2647 2648#if defined(__FreeBSD__) && defined(_KERNEL) 2649 dsl_dataset_name(ds, newname); 2650 zfsvfs_update_fromname(oldname, newname); 2651 zvol_rename_minors(oldname, newname); 2652#endif 2653 2654 /* move any clone references */ 2655 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2656 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2657 zap_cursor_t zc; 2658 zap_attribute_t za; 2659 2660 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2661 dsl_dataset_phys(ds)->ds_next_clones_obj); 2662 zap_cursor_retrieve(&zc, &za) == 0; 2663 zap_cursor_advance(&zc)) { 2664 dsl_dataset_t *cnds; 2665 uint64_t o; 2666 2667 if (za.za_first_integer == oldnext_obj) { 2668 /* 2669 * We've already moved the 2670 * origin's reference. 2671 */ 2672 continue; 2673 } 2674 2675 VERIFY0(dsl_dataset_hold_obj(dp, 2676 za.za_first_integer, FTAG, &cnds)); 2677 o = dsl_dir_phys(cnds->ds_dir)-> 2678 dd_head_dataset_obj; 2679 2680 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2681 dsl_dir_phys(odd)->dd_clones, o, tx)); 2682 VERIFY0(zap_add_int(dp->dp_meta_objset, 2683 dsl_dir_phys(dd)->dd_clones, o, tx)); 2684 dsl_dataset_rele(cnds, FTAG); 2685 } 2686 zap_cursor_fini(&zc); 2687 } 2688 2689 ASSERT(!dsl_prop_hascb(ds)); 2690 } 2691 2692#if defined(__FreeBSD__) && defined(_KERNEL) 2693 mutex_exit(&spa_namespace_lock); 2694 2695 kmem_free(newname, MAXPATHLEN); 2696 kmem_free(oldname, MAXPATHLEN); 2697#endif 2698 /* 2699 * Change space accounting. 2700 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2701 * both be valid, or both be 0 (resulting in delta == 0). This 2702 * is true for each of {clone,origin} independently. 2703 */ 2704 2705 delta = ddpa->cloneusedsnap - 2706 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2707 ASSERT3S(delta, >=, 0); 2708 ASSERT3U(ddpa->used, >=, delta); 2709 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2710 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2711 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2712 2713 delta = ddpa->originusedsnap - 2714 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2715 ASSERT3S(delta, <=, 0); 2716 ASSERT3U(ddpa->used, >=, -delta); 2717 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2718 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2719 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2720 2721 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2722 2723 /* log history record */ 2724 spa_history_log_internal_ds(hds, "promote", tx, ""); 2725 2726 dsl_dir_rele(odd, FTAG); 2727 promote_rele(ddpa, FTAG); 2728} 2729 2730/* 2731 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2732 * (exclusive) and last_obj (inclusive). The list will be in reverse 2733 * order (last_obj will be the list_head()). If first_obj == 0, do all 2734 * snapshots back to this dataset's origin. 2735 */ 2736static int 2737snaplist_make(dsl_pool_t *dp, 2738 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2739{ 2740 uint64_t obj = last_obj; 2741 2742 list_create(l, sizeof (struct promotenode), 2743 offsetof(struct promotenode, link)); 2744 2745 while (obj != first_obj) { 2746 dsl_dataset_t *ds; 2747 struct promotenode *snap; 2748 int err; 2749 2750 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2751 ASSERT(err != ENOENT); 2752 if (err != 0) 2753 return (err); 2754 2755 if (first_obj == 0) 2756 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2757 2758 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2759 snap->ds = ds; 2760 list_insert_tail(l, snap); 2761 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2762 } 2763 2764 return (0); 2765} 2766 2767static int 2768snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2769{ 2770 struct promotenode *snap; 2771 2772 *spacep = 0; 2773 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2774 uint64_t used, comp, uncomp; 2775 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2776 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2777 *spacep += used; 2778 } 2779 return (0); 2780} 2781 2782static void 2783snaplist_destroy(list_t *l, void *tag) 2784{ 2785 struct promotenode *snap; 2786 2787 if (l == NULL || !list_link_active(&l->list_head)) 2788 return; 2789 2790 while ((snap = list_tail(l)) != NULL) { 2791 list_remove(l, snap); 2792 dsl_dataset_rele(snap->ds, tag); 2793 kmem_free(snap, sizeof (*snap)); 2794 } 2795 list_destroy(l); 2796} 2797 2798static int 2799promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2800{ 2801 int error; 2802 dsl_dir_t *dd; 2803 struct promotenode *snap; 2804 2805 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2806 &ddpa->ddpa_clone); 2807 if (error != 0) 2808 return (error); 2809 dd = ddpa->ddpa_clone->ds_dir; 2810 2811 if (ddpa->ddpa_clone->ds_is_snapshot || 2812 !dsl_dir_is_clone(dd)) { 2813 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2814 return (SET_ERROR(EINVAL)); 2815 } 2816 2817 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2818 &ddpa->shared_snaps, tag); 2819 if (error != 0) 2820 goto out; 2821 2822 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2823 &ddpa->clone_snaps, tag); 2824 if (error != 0) 2825 goto out; 2826 2827 snap = list_head(&ddpa->shared_snaps); 2828 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2829 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2830 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2831 &ddpa->origin_snaps, tag); 2832 if (error != 0) 2833 goto out; 2834 2835 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2836 error = dsl_dataset_hold_obj(dp, 2837 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2838 tag, &ddpa->origin_origin); 2839 if (error != 0) 2840 goto out; 2841 } 2842out: 2843 if (error != 0) 2844 promote_rele(ddpa, tag); 2845 return (error); 2846} 2847 2848static void 2849promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2850{ 2851 snaplist_destroy(&ddpa->shared_snaps, tag); 2852 snaplist_destroy(&ddpa->clone_snaps, tag); 2853 snaplist_destroy(&ddpa->origin_snaps, tag); 2854 if (ddpa->origin_origin != NULL) 2855 dsl_dataset_rele(ddpa->origin_origin, tag); 2856 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2857} 2858 2859/* 2860 * Promote a clone. 2861 * 2862 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2863 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2864 */ 2865int 2866dsl_dataset_promote(const char *name, char *conflsnap) 2867{ 2868 dsl_dataset_promote_arg_t ddpa = { 0 }; 2869 uint64_t numsnaps; 2870 int error; 2871 objset_t *os; 2872 2873 /* 2874 * We will modify space proportional to the number of 2875 * snapshots. Compute numsnaps. 2876 */ 2877 error = dmu_objset_hold(name, FTAG, &os); 2878 if (error != 0) 2879 return (error); 2880 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2881 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2882 &numsnaps); 2883 dmu_objset_rele(os, FTAG); 2884 if (error != 0) 2885 return (error); 2886 2887 ddpa.ddpa_clonename = name; 2888 ddpa.err_ds = conflsnap; 2889 ddpa.cr = CRED(); 2890 2891 return (dsl_sync_task(name, dsl_dataset_promote_check, 2892 dsl_dataset_promote_sync, &ddpa, 2893 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2894} 2895 2896int 2897dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2898 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2899{ 2900 int64_t unused_refres_delta; 2901 2902 /* they should both be heads */ 2903 if (clone->ds_is_snapshot || 2904 origin_head->ds_is_snapshot) 2905 return (SET_ERROR(EINVAL)); 2906 2907 /* if we are not forcing, the branch point should be just before them */ 2908 if (!force && clone->ds_prev != origin_head->ds_prev) 2909 return (SET_ERROR(EINVAL)); 2910 2911 /* clone should be the clone (unless they are unrelated) */ 2912 if (clone->ds_prev != NULL && 2913 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2914 origin_head->ds_dir != clone->ds_prev->ds_dir) 2915 return (SET_ERROR(EINVAL)); 2916 2917 /* the clone should be a child of the origin */ 2918 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2919 return (SET_ERROR(EINVAL)); 2920 2921 /* origin_head shouldn't be modified unless 'force' */ 2922 if (!force && 2923 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2924 return (SET_ERROR(ETXTBSY)); 2925 2926 /* origin_head should have no long holds (e.g. is not mounted) */ 2927 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2928 return (SET_ERROR(EBUSY)); 2929 2930 /* check amount of any unconsumed refreservation */ 2931 unused_refres_delta = 2932 (int64_t)MIN(origin_head->ds_reserved, 2933 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2934 (int64_t)MIN(origin_head->ds_reserved, 2935 dsl_dataset_phys(clone)->ds_unique_bytes); 2936 2937 if (unused_refres_delta > 0 && 2938 unused_refres_delta > 2939 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2940 return (SET_ERROR(ENOSPC)); 2941 2942 /* clone can't be over the head's refquota */ 2943 if (origin_head->ds_quota != 0 && 2944 dsl_dataset_phys(clone)->ds_referenced_bytes > 2945 origin_head->ds_quota) 2946 return (SET_ERROR(EDQUOT)); 2947 2948 return (0); 2949} 2950 2951void 2952dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2953 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2954{ 2955 dsl_pool_t *dp = dmu_tx_pool(tx); 2956 int64_t unused_refres_delta; 2957 2958 ASSERT(clone->ds_reserved == 0); 2959 ASSERT(origin_head->ds_quota == 0 || 2960 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); 2961 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2962 2963 /* 2964 * Swap per-dataset feature flags. 2965 */ 2966 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2967 if (!(spa_feature_table[f].fi_flags & 2968 ZFEATURE_FLAG_PER_DATASET)) { 2969 ASSERT(!clone->ds_feature_inuse[f]); 2970 ASSERT(!origin_head->ds_feature_inuse[f]); 2971 continue; 2972 } 2973 2974 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 2975 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 2976 2977 if (clone_inuse) { 2978 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 2979 clone->ds_feature_inuse[f] = B_FALSE; 2980 } 2981 if (origin_head_inuse) { 2982 dsl_dataset_deactivate_feature(origin_head->ds_object, 2983 f, tx); 2984 origin_head->ds_feature_inuse[f] = B_FALSE; 2985 } 2986 if (clone_inuse) { 2987 dsl_dataset_activate_feature(origin_head->ds_object, 2988 f, tx); 2989 origin_head->ds_feature_inuse[f] = B_TRUE; 2990 } 2991 if (origin_head_inuse) { 2992 dsl_dataset_activate_feature(clone->ds_object, f, tx); 2993 clone->ds_feature_inuse[f] = B_TRUE; 2994 } 2995 } 2996 2997 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2998 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2999 3000 if (clone->ds_objset != NULL) { 3001 dmu_objset_evict(clone->ds_objset); 3002 clone->ds_objset = NULL; 3003 } 3004 3005 if (origin_head->ds_objset != NULL) { 3006 dmu_objset_evict(origin_head->ds_objset); 3007 origin_head->ds_objset = NULL; 3008 } 3009 3010 unused_refres_delta = 3011 (int64_t)MIN(origin_head->ds_reserved, 3012 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3013 (int64_t)MIN(origin_head->ds_reserved, 3014 dsl_dataset_phys(clone)->ds_unique_bytes); 3015 3016 /* 3017 * Reset origin's unique bytes, if it exists. 3018 */ 3019 if (clone->ds_prev) { 3020 dsl_dataset_t *origin = clone->ds_prev; 3021 uint64_t comp, uncomp; 3022 3023 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3024 dsl_deadlist_space_range(&clone->ds_deadlist, 3025 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3026 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3027 } 3028 3029 /* swap blkptrs */ 3030 { 3031 blkptr_t tmp; 3032 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3033 dsl_dataset_phys(origin_head)->ds_bp = 3034 dsl_dataset_phys(clone)->ds_bp; 3035 dsl_dataset_phys(clone)->ds_bp = tmp; 3036 } 3037 3038 /* set dd_*_bytes */ 3039 { 3040 int64_t dused, dcomp, duncomp; 3041 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3042 uint64_t odl_used, odl_comp, odl_uncomp; 3043 3044 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3045 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3046 3047 dsl_deadlist_space(&clone->ds_deadlist, 3048 &cdl_used, &cdl_comp, &cdl_uncomp); 3049 dsl_deadlist_space(&origin_head->ds_deadlist, 3050 &odl_used, &odl_comp, &odl_uncomp); 3051 3052 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3053 cdl_used - 3054 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3055 odl_used); 3056 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3057 cdl_comp - 3058 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3059 odl_comp); 3060 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3061 cdl_uncomp - 3062 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3063 odl_uncomp); 3064 3065 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3066 dused, dcomp, duncomp, tx); 3067 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3068 -dused, -dcomp, -duncomp, tx); 3069 3070 /* 3071 * The difference in the space used by snapshots is the 3072 * difference in snapshot space due to the head's 3073 * deadlist (since that's the only thing that's 3074 * changing that affects the snapused). 3075 */ 3076 dsl_deadlist_space_range(&clone->ds_deadlist, 3077 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3078 &cdl_used, &cdl_comp, &cdl_uncomp); 3079 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3080 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3081 &odl_used, &odl_comp, &odl_uncomp); 3082 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3083 DD_USED_HEAD, DD_USED_SNAP, NULL); 3084 } 3085 3086 /* swap ds_*_bytes */ 3087 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3088 dsl_dataset_phys(clone)->ds_referenced_bytes); 3089 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3090 dsl_dataset_phys(clone)->ds_compressed_bytes); 3091 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3092 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3093 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3094 dsl_dataset_phys(clone)->ds_unique_bytes); 3095 3096 /* apply any parent delta for change in unconsumed refreservation */ 3097 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3098 unused_refres_delta, 0, 0, tx); 3099 3100 /* 3101 * Swap deadlists. 3102 */ 3103 dsl_deadlist_close(&clone->ds_deadlist); 3104 dsl_deadlist_close(&origin_head->ds_deadlist); 3105 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3106 dsl_dataset_phys(clone)->ds_deadlist_obj); 3107 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3108 dsl_dataset_phys(clone)->ds_deadlist_obj); 3109 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3110 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3111 3112 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3113 3114 spa_history_log_internal_ds(clone, "clone swap", tx, 3115 "parent=%s", origin_head->ds_dir->dd_myname); 3116} 3117 3118/* 3119 * Given a pool name and a dataset object number in that pool, 3120 * return the name of that dataset. 3121 */ 3122int 3123dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3124{ 3125 dsl_pool_t *dp; 3126 dsl_dataset_t *ds; 3127 int error; 3128 3129 error = dsl_pool_hold(pname, FTAG, &dp); 3130 if (error != 0) 3131 return (error); 3132 3133 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3134 if (error == 0) { 3135 dsl_dataset_name(ds, buf); 3136 dsl_dataset_rele(ds, FTAG); 3137 } 3138 dsl_pool_rele(dp, FTAG); 3139 3140 return (error); 3141} 3142 3143int 3144dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3145 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3146{ 3147 int error = 0; 3148 3149 ASSERT3S(asize, >, 0); 3150 3151 /* 3152 * *ref_rsrv is the portion of asize that will come from any 3153 * unconsumed refreservation space. 3154 */ 3155 *ref_rsrv = 0; 3156 3157 mutex_enter(&ds->ds_lock); 3158 /* 3159 * Make a space adjustment for reserved bytes. 3160 */ 3161 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3162 ASSERT3U(*used, >=, 3163 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3164 *used -= 3165 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3166 *ref_rsrv = 3167 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3168 } 3169 3170 if (!check_quota || ds->ds_quota == 0) { 3171 mutex_exit(&ds->ds_lock); 3172 return (0); 3173 } 3174 /* 3175 * If they are requesting more space, and our current estimate 3176 * is over quota, they get to try again unless the actual 3177 * on-disk is over quota and there are no pending changes (which 3178 * may free up space for us). 3179 */ 3180 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3181 ds->ds_quota) { 3182 if (inflight > 0 || 3183 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3184 error = SET_ERROR(ERESTART); 3185 else 3186 error = SET_ERROR(EDQUOT); 3187 } 3188 mutex_exit(&ds->ds_lock); 3189 3190 return (error); 3191} 3192 3193typedef struct dsl_dataset_set_qr_arg { 3194 const char *ddsqra_name; 3195 zprop_source_t ddsqra_source; 3196 uint64_t ddsqra_value; 3197} dsl_dataset_set_qr_arg_t; 3198 3199 3200/* ARGSUSED */ 3201static int 3202dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3203{ 3204 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3205 dsl_pool_t *dp = dmu_tx_pool(tx); 3206 dsl_dataset_t *ds; 3207 int error; 3208 uint64_t newval; 3209 3210 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3211 return (SET_ERROR(ENOTSUP)); 3212 3213 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3214 if (error != 0) 3215 return (error); 3216 3217 if (ds->ds_is_snapshot) { 3218 dsl_dataset_rele(ds, FTAG); 3219 return (SET_ERROR(EINVAL)); 3220 } 3221 3222 error = dsl_prop_predict(ds->ds_dir, 3223 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3224 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3225 if (error != 0) { 3226 dsl_dataset_rele(ds, FTAG); 3227 return (error); 3228 } 3229 3230 if (newval == 0) { 3231 dsl_dataset_rele(ds, FTAG); 3232 return (0); 3233 } 3234 3235 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3236 newval < ds->ds_reserved) { 3237 dsl_dataset_rele(ds, FTAG); 3238 return (SET_ERROR(ENOSPC)); 3239 } 3240 3241 dsl_dataset_rele(ds, FTAG); 3242 return (0); 3243} 3244 3245static void 3246dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3247{ 3248 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3249 dsl_pool_t *dp = dmu_tx_pool(tx); 3250 dsl_dataset_t *ds; 3251 uint64_t newval; 3252 3253 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3254 3255 dsl_prop_set_sync_impl(ds, 3256 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3257 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3258 &ddsqra->ddsqra_value, tx); 3259 3260 VERIFY0(dsl_prop_get_int_ds(ds, 3261 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3262 3263 if (ds->ds_quota != newval) { 3264 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3265 ds->ds_quota = newval; 3266 } 3267 dsl_dataset_rele(ds, FTAG); 3268} 3269 3270int 3271dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3272 uint64_t refquota) 3273{ 3274 dsl_dataset_set_qr_arg_t ddsqra; 3275 3276 ddsqra.ddsqra_name = dsname; 3277 ddsqra.ddsqra_source = source; 3278 ddsqra.ddsqra_value = refquota; 3279 3280 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3281 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3282} 3283 3284static int 3285dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3286{ 3287 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3288 dsl_pool_t *dp = dmu_tx_pool(tx); 3289 dsl_dataset_t *ds; 3290 int error; 3291 uint64_t newval, unique; 3292 3293 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3294 return (SET_ERROR(ENOTSUP)); 3295 3296 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3297 if (error != 0) 3298 return (error); 3299 3300 if (ds->ds_is_snapshot) { 3301 dsl_dataset_rele(ds, FTAG); 3302 return (SET_ERROR(EINVAL)); 3303 } 3304 3305 error = dsl_prop_predict(ds->ds_dir, 3306 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3307 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3308 if (error != 0) { 3309 dsl_dataset_rele(ds, FTAG); 3310 return (error); 3311 } 3312 3313 /* 3314 * If we are doing the preliminary check in open context, the 3315 * space estimates may be inaccurate. 3316 */ 3317 if (!dmu_tx_is_syncing(tx)) { 3318 dsl_dataset_rele(ds, FTAG); 3319 return (0); 3320 } 3321 3322 mutex_enter(&ds->ds_lock); 3323 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3324 dsl_dataset_recalc_head_uniq(ds); 3325 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3326 mutex_exit(&ds->ds_lock); 3327 3328 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3329 uint64_t delta = MAX(unique, newval) - 3330 MAX(unique, ds->ds_reserved); 3331 3332 if (delta > 3333 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3334 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3335 dsl_dataset_rele(ds, FTAG); 3336 return (SET_ERROR(ENOSPC)); 3337 } 3338 } 3339 3340 dsl_dataset_rele(ds, FTAG); 3341 return (0); 3342} 3343 3344void 3345dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3346 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3347{ 3348 uint64_t newval; 3349 uint64_t unique; 3350 int64_t delta; 3351 3352 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3353 source, sizeof (value), 1, &value, tx); 3354 3355 VERIFY0(dsl_prop_get_int_ds(ds, 3356 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3357 3358 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3359 mutex_enter(&ds->ds_dir->dd_lock); 3360 mutex_enter(&ds->ds_lock); 3361 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3362 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3363 delta = MAX(0, (int64_t)(newval - unique)) - 3364 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3365 ds->ds_reserved = newval; 3366 mutex_exit(&ds->ds_lock); 3367 3368 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3369 mutex_exit(&ds->ds_dir->dd_lock); 3370} 3371 3372static void 3373dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3374{ 3375 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3376 dsl_pool_t *dp = dmu_tx_pool(tx); 3377 dsl_dataset_t *ds; 3378 3379 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3380 dsl_dataset_set_refreservation_sync_impl(ds, 3381 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3382 dsl_dataset_rele(ds, FTAG); 3383} 3384 3385int 3386dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3387 uint64_t refreservation) 3388{ 3389 dsl_dataset_set_qr_arg_t ddsqra; 3390 3391 ddsqra.ddsqra_name = dsname; 3392 ddsqra.ddsqra_source = source; 3393 ddsqra.ddsqra_value = refreservation; 3394 3395 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3396 dsl_dataset_set_refreservation_sync, &ddsqra, 3397 0, ZFS_SPACE_CHECK_NONE)); 3398} 3399 3400/* 3401 * Return (in *usedp) the amount of space written in new that is not 3402 * present in oldsnap. New may be a snapshot or the head. Old must be 3403 * a snapshot before new, in new's filesystem (or its origin). If not then 3404 * fail and return EINVAL. 3405 * 3406 * The written space is calculated by considering two components: First, we 3407 * ignore any freed space, and calculate the written as new's used space 3408 * minus old's used space. Next, we add in the amount of space that was freed 3409 * between the two snapshots, thus reducing new's used space relative to old's. 3410 * Specifically, this is the space that was born before old->ds_creation_txg, 3411 * and freed before new (ie. on new's deadlist or a previous deadlist). 3412 * 3413 * space freed [---------------------] 3414 * snapshots ---O-------O--------O-------O------ 3415 * oldsnap new 3416 */ 3417int 3418dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3419 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3420{ 3421 int err = 0; 3422 uint64_t snapobj; 3423 dsl_pool_t *dp = new->ds_dir->dd_pool; 3424 3425 ASSERT(dsl_pool_config_held(dp)); 3426 3427 *usedp = 0; 3428 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3429 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3430 3431 *compp = 0; 3432 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3433 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3434 3435 *uncompp = 0; 3436 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3437 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3438 3439 snapobj = new->ds_object; 3440 while (snapobj != oldsnap->ds_object) { 3441 dsl_dataset_t *snap; 3442 uint64_t used, comp, uncomp; 3443 3444 if (snapobj == new->ds_object) { 3445 snap = new; 3446 } else { 3447 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3448 if (err != 0) 3449 break; 3450 } 3451 3452 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3453 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3454 /* 3455 * The blocks in the deadlist can not be born after 3456 * ds_prev_snap_txg, so get the whole deadlist space, 3457 * which is more efficient (especially for old-format 3458 * deadlists). Unfortunately the deadlist code 3459 * doesn't have enough information to make this 3460 * optimization itself. 3461 */ 3462 dsl_deadlist_space(&snap->ds_deadlist, 3463 &used, &comp, &uncomp); 3464 } else { 3465 dsl_deadlist_space_range(&snap->ds_deadlist, 3466 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3467 &used, &comp, &uncomp); 3468 } 3469 *usedp += used; 3470 *compp += comp; 3471 *uncompp += uncomp; 3472 3473 /* 3474 * If we get to the beginning of the chain of snapshots 3475 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3476 * was not a snapshot of/before new. 3477 */ 3478 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3479 if (snap != new) 3480 dsl_dataset_rele(snap, FTAG); 3481 if (snapobj == 0) { 3482 err = SET_ERROR(EINVAL); 3483 break; 3484 } 3485 3486 } 3487 return (err); 3488} 3489 3490/* 3491 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3492 * lastsnap, and all snapshots in between are deleted. 3493 * 3494 * blocks that would be freed [---------------------------] 3495 * snapshots ---O-------O--------O-------O--------O 3496 * firstsnap lastsnap 3497 * 3498 * This is the set of blocks that were born after the snap before firstsnap, 3499 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3500 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3501 * We calculate this by iterating over the relevant deadlists (from the snap 3502 * after lastsnap, backward to the snap after firstsnap), summing up the 3503 * space on the deadlist that was born after the snap before firstsnap. 3504 */ 3505int 3506dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3507 dsl_dataset_t *lastsnap, 3508 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3509{ 3510 int err = 0; 3511 uint64_t snapobj; 3512 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3513 3514 ASSERT(firstsnap->ds_is_snapshot); 3515 ASSERT(lastsnap->ds_is_snapshot); 3516 3517 /* 3518 * Check that the snapshots are in the same dsl_dir, and firstsnap 3519 * is before lastsnap. 3520 */ 3521 if (firstsnap->ds_dir != lastsnap->ds_dir || 3522 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3523 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3524 return (SET_ERROR(EINVAL)); 3525 3526 *usedp = *compp = *uncompp = 0; 3527 3528 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3529 while (snapobj != firstsnap->ds_object) { 3530 dsl_dataset_t *ds; 3531 uint64_t used, comp, uncomp; 3532 3533 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3534 if (err != 0) 3535 break; 3536 3537 dsl_deadlist_space_range(&ds->ds_deadlist, 3538 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3539 &used, &comp, &uncomp); 3540 *usedp += used; 3541 *compp += comp; 3542 *uncompp += uncomp; 3543 3544 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3545 ASSERT3U(snapobj, !=, 0); 3546 dsl_dataset_rele(ds, FTAG); 3547 } 3548 return (err); 3549} 3550 3551/* 3552 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3553 * For example, they could both be snapshots of the same filesystem, and 3554 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3555 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3556 * filesystem. Or 'earlier' could be the origin's origin. 3557 * 3558 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3559 */ 3560boolean_t 3561dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3562 uint64_t earlier_txg) 3563{ 3564 dsl_pool_t *dp = later->ds_dir->dd_pool; 3565 int error; 3566 boolean_t ret; 3567 3568 ASSERT(dsl_pool_config_held(dp)); 3569 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3570 3571 if (earlier_txg == 0) 3572 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3573 3574 if (later->ds_is_snapshot && 3575 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3576 return (B_FALSE); 3577 3578 if (later->ds_dir == earlier->ds_dir) 3579 return (B_TRUE); 3580 if (!dsl_dir_is_clone(later->ds_dir)) 3581 return (B_FALSE); 3582 3583 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3584 return (B_TRUE); 3585 dsl_dataset_t *origin; 3586 error = dsl_dataset_hold_obj(dp, 3587 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3588 if (error != 0) 3589 return (B_FALSE); 3590 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3591 dsl_dataset_rele(origin, FTAG); 3592 return (ret); 3593} 3594 3595void 3596dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3597{ 3598 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3599 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3600} 3601 3602boolean_t 3603dsl_dataset_is_zapified(dsl_dataset_t *ds) 3604{ 3605 dmu_object_info_t doi; 3606 3607 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3608 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3609} 3610 3611boolean_t 3612dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3613{ 3614 return (dsl_dataset_is_zapified(ds) && 3615 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3616 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3617} 3618