dsl_dataset.c revision 290757
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 */ 29 30#include <sys/dmu_objset.h> 31#include <sys/dsl_dataset.h> 32#include <sys/dsl_dir.h> 33#include <sys/dsl_prop.h> 34#include <sys/dsl_synctask.h> 35#include <sys/dmu_traverse.h> 36#include <sys/dmu_impl.h> 37#include <sys/dmu_send.h> 38#include <sys/dmu_tx.h> 39#include <sys/arc.h> 40#include <sys/zio.h> 41#include <sys/zap.h> 42#include <sys/zfeature.h> 43#include <sys/unique.h> 44#include <sys/zfs_context.h> 45#include <sys/zfs_ioctl.h> 46#include <sys/spa.h> 47#include <sys/zfs_znode.h> 48#include <sys/zfs_onexit.h> 49#include <sys/zvol.h> 50#include <sys/dsl_scan.h> 51#include <sys/dsl_deadlist.h> 52#include <sys/dsl_destroy.h> 53#include <sys/dsl_userhold.h> 54#include <sys/dsl_bookmark.h> 55#include <sys/dmu_send.h> 56#include <sys/zio_checksum.h> 57#include <sys/zio_compress.h> 58#include <zfs_fletcher.h> 59 60SYSCTL_DECL(_vfs_zfs); 61 62/* 63 * The SPA supports block sizes up to 16MB. However, very large blocks 64 * can have an impact on i/o latency (e.g. tying up a spinning disk for 65 * ~300ms), and also potentially on the memory allocator. Therefore, 66 * we do not allow the recordsize to be set larger than zfs_max_recordsize 67 * (default 1MB). Larger blocks can be created by changing this tunable, 68 * and pools with larger blocks can always be imported and used, regardless 69 * of this setting. 70 */ 71int zfs_max_recordsize = 1 * 1024 * 1024; 72SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 73 &zfs_max_recordsize, 0, 74 "Maximum block size. Expect dragons when tuning this."); 75 76#define SWITCH64(x, y) \ 77 { \ 78 uint64_t __tmp = (x); \ 79 (x) = (y); \ 80 (y) = __tmp; \ 81 } 82 83#define DS_REF_MAX (1ULL << 62) 84 85extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 86 87/* 88 * Figure out how much of this delta should be propogated to the dsl_dir 89 * layer. If there's a refreservation, that space has already been 90 * partially accounted for in our ancestors. 91 */ 92static int64_t 93parent_delta(dsl_dataset_t *ds, int64_t delta) 94{ 95 dsl_dataset_phys_t *ds_phys; 96 uint64_t old_bytes, new_bytes; 97 98 if (ds->ds_reserved == 0) 99 return (delta); 100 101 ds_phys = dsl_dataset_phys(ds); 102 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 103 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 104 105 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 106 return (new_bytes - old_bytes); 107} 108 109void 110dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 111{ 112 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 113 int compressed = BP_GET_PSIZE(bp); 114 int uncompressed = BP_GET_UCSIZE(bp); 115 int64_t delta; 116 117 dprintf_bp(bp, "ds=%p", ds); 118 119 ASSERT(dmu_tx_is_syncing(tx)); 120 /* It could have been compressed away to nothing */ 121 if (BP_IS_HOLE(bp)) 122 return; 123 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 124 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 125 if (ds == NULL) { 126 dsl_pool_mos_diduse_space(tx->tx_pool, 127 used, compressed, uncompressed); 128 return; 129 } 130 131 dmu_buf_will_dirty(ds->ds_dbuf, tx); 132 mutex_enter(&ds->ds_lock); 133 delta = parent_delta(ds, used); 134 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 135 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 136 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 137 dsl_dataset_phys(ds)->ds_unique_bytes += used; 138 139 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 140 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 141 B_TRUE; 142 } 143 144 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 145 if (f != SPA_FEATURE_NONE) 146 ds->ds_feature_activation_needed[f] = B_TRUE; 147 148 mutex_exit(&ds->ds_lock); 149 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 150 compressed, uncompressed, tx); 151 dsl_dir_transfer_space(ds->ds_dir, used - delta, 152 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 153} 154 155int 156dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 157 boolean_t async) 158{ 159 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 160 int compressed = BP_GET_PSIZE(bp); 161 int uncompressed = BP_GET_UCSIZE(bp); 162 163 if (BP_IS_HOLE(bp)) 164 return (0); 165 166 ASSERT(dmu_tx_is_syncing(tx)); 167 ASSERT(bp->blk_birth <= tx->tx_txg); 168 169 if (ds == NULL) { 170 dsl_free(tx->tx_pool, tx->tx_txg, bp); 171 dsl_pool_mos_diduse_space(tx->tx_pool, 172 -used, -compressed, -uncompressed); 173 return (used); 174 } 175 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 176 177 ASSERT(!ds->ds_is_snapshot); 178 dmu_buf_will_dirty(ds->ds_dbuf, tx); 179 180 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 181 int64_t delta; 182 183 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 184 dsl_free(tx->tx_pool, tx->tx_txg, bp); 185 186 mutex_enter(&ds->ds_lock); 187 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 188 !DS_UNIQUE_IS_ACCURATE(ds)); 189 delta = parent_delta(ds, -used); 190 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 191 mutex_exit(&ds->ds_lock); 192 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 193 delta, -compressed, -uncompressed, tx); 194 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 195 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 196 } else { 197 dprintf_bp(bp, "putting on dead list: %s", ""); 198 if (async) { 199 /* 200 * We are here as part of zio's write done callback, 201 * which means we're a zio interrupt thread. We can't 202 * call dsl_deadlist_insert() now because it may block 203 * waiting for I/O. Instead, put bp on the deferred 204 * queue and let dsl_pool_sync() finish the job. 205 */ 206 bplist_append(&ds->ds_pending_deadlist, bp); 207 } else { 208 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 209 } 210 ASSERT3U(ds->ds_prev->ds_object, ==, 211 dsl_dataset_phys(ds)->ds_prev_snap_obj); 212 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 213 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 214 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 215 ds->ds_object && bp->blk_birth > 216 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 217 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 218 mutex_enter(&ds->ds_prev->ds_lock); 219 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 220 mutex_exit(&ds->ds_prev->ds_lock); 221 } 222 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 223 dsl_dir_transfer_space(ds->ds_dir, used, 224 DD_USED_HEAD, DD_USED_SNAP, tx); 225 } 226 } 227 mutex_enter(&ds->ds_lock); 228 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 229 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 230 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 231 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 232 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 233 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 234 mutex_exit(&ds->ds_lock); 235 236 return (used); 237} 238 239uint64_t 240dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 241{ 242 uint64_t trysnap = 0; 243 244 if (ds == NULL) 245 return (0); 246 /* 247 * The snapshot creation could fail, but that would cause an 248 * incorrect FALSE return, which would only result in an 249 * overestimation of the amount of space that an operation would 250 * consume, which is OK. 251 * 252 * There's also a small window where we could miss a pending 253 * snapshot, because we could set the sync task in the quiescing 254 * phase. So this should only be used as a guess. 255 */ 256 if (ds->ds_trysnap_txg > 257 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 258 trysnap = ds->ds_trysnap_txg; 259 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 260} 261 262boolean_t 263dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 264 uint64_t blk_birth) 265{ 266 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 267 (bp != NULL && BP_IS_HOLE(bp))) 268 return (B_FALSE); 269 270 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 271 272 return (B_TRUE); 273} 274 275static void 276dsl_dataset_evict(void *dbu) 277{ 278 dsl_dataset_t *ds = dbu; 279 280 ASSERT(ds->ds_owner == NULL); 281 282 ds->ds_dbuf = NULL; 283 284 unique_remove(ds->ds_fsid_guid); 285 286 if (ds->ds_objset != NULL) 287 dmu_objset_evict(ds->ds_objset); 288 289 if (ds->ds_prev) { 290 dsl_dataset_rele(ds->ds_prev, ds); 291 ds->ds_prev = NULL; 292 } 293 294 bplist_destroy(&ds->ds_pending_deadlist); 295 if (ds->ds_deadlist.dl_os != NULL) 296 dsl_deadlist_close(&ds->ds_deadlist); 297 if (ds->ds_dir) 298 dsl_dir_async_rele(ds->ds_dir, ds); 299 300 ASSERT(!list_link_active(&ds->ds_synced_link)); 301 302 list_destroy(&ds->ds_prop_cbs); 303 if (mutex_owned(&ds->ds_lock)) 304 mutex_exit(&ds->ds_lock); 305 mutex_destroy(&ds->ds_lock); 306 if (mutex_owned(&ds->ds_opening_lock)) 307 mutex_exit(&ds->ds_opening_lock); 308 mutex_destroy(&ds->ds_opening_lock); 309 mutex_destroy(&ds->ds_sendstream_lock); 310 refcount_destroy(&ds->ds_longholds); 311 312 kmem_free(ds, sizeof (dsl_dataset_t)); 313} 314 315int 316dsl_dataset_get_snapname(dsl_dataset_t *ds) 317{ 318 dsl_dataset_phys_t *headphys; 319 int err; 320 dmu_buf_t *headdbuf; 321 dsl_pool_t *dp = ds->ds_dir->dd_pool; 322 objset_t *mos = dp->dp_meta_objset; 323 324 if (ds->ds_snapname[0]) 325 return (0); 326 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 327 return (0); 328 329 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 330 FTAG, &headdbuf); 331 if (err != 0) 332 return (err); 333 headphys = headdbuf->db_data; 334 err = zap_value_search(dp->dp_meta_objset, 335 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 336 dmu_buf_rele(headdbuf, FTAG); 337 return (err); 338} 339 340int 341dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 342{ 343 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 344 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 345 matchtype_t mt; 346 int err; 347 348 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 349 mt = MT_FIRST; 350 else 351 mt = MT_EXACT; 352 353 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 354 value, mt, NULL, 0, NULL); 355 if (err == ENOTSUP && mt == MT_FIRST) 356 err = zap_lookup(mos, snapobj, name, 8, 1, value); 357 return (err); 358} 359 360int 361dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 362 boolean_t adj_cnt) 363{ 364 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 365 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 366 matchtype_t mt; 367 int err; 368 369 dsl_dir_snap_cmtime_update(ds->ds_dir); 370 371 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 372 mt = MT_FIRST; 373 else 374 mt = MT_EXACT; 375 376 err = zap_remove_norm(mos, snapobj, name, mt, tx); 377 if (err == ENOTSUP && mt == MT_FIRST) 378 err = zap_remove(mos, snapobj, name, tx); 379 380 if (err == 0 && adj_cnt) 381 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 382 DD_FIELD_SNAPSHOT_COUNT, tx); 383 384 return (err); 385} 386 387boolean_t 388dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 389{ 390 dmu_buf_t *dbuf = ds->ds_dbuf; 391 boolean_t result = B_FALSE; 392 393 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 394 ds->ds_object, DMU_BONUS_BLKID, tag)) { 395 396 if (ds == dmu_buf_get_user(dbuf)) 397 result = B_TRUE; 398 else 399 dmu_buf_rele(dbuf, tag); 400 } 401 402 return (result); 403} 404 405int 406dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 407 dsl_dataset_t **dsp) 408{ 409 objset_t *mos = dp->dp_meta_objset; 410 dmu_buf_t *dbuf; 411 dsl_dataset_t *ds; 412 int err; 413 dmu_object_info_t doi; 414 415 ASSERT(dsl_pool_config_held(dp)); 416 417 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 418 if (err != 0) 419 return (err); 420 421 /* Make sure dsobj has the correct object type. */ 422 dmu_object_info_from_db(dbuf, &doi); 423 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 424 dmu_buf_rele(dbuf, tag); 425 return (SET_ERROR(EINVAL)); 426 } 427 428 ds = dmu_buf_get_user(dbuf); 429 if (ds == NULL) { 430 dsl_dataset_t *winner = NULL; 431 432 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 433 ds->ds_dbuf = dbuf; 434 ds->ds_object = dsobj; 435 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 436 437 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 438 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 439 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 440 refcount_create(&ds->ds_longholds); 441 442 bplist_create(&ds->ds_pending_deadlist); 443 dsl_deadlist_open(&ds->ds_deadlist, 444 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 445 446 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 447 offsetof(dmu_sendarg_t, dsa_link)); 448 449 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 450 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 451 452 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 453 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 454 if (!(spa_feature_table[f].fi_flags & 455 ZFEATURE_FLAG_PER_DATASET)) 456 continue; 457 err = zap_contains(mos, dsobj, 458 spa_feature_table[f].fi_guid); 459 if (err == 0) { 460 ds->ds_feature_inuse[f] = B_TRUE; 461 } else { 462 ASSERT3U(err, ==, ENOENT); 463 err = 0; 464 } 465 } 466 } 467 468 err = dsl_dir_hold_obj(dp, 469 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 470 if (err != 0) { 471 mutex_destroy(&ds->ds_lock); 472 mutex_destroy(&ds->ds_opening_lock); 473 mutex_destroy(&ds->ds_sendstream_lock); 474 refcount_destroy(&ds->ds_longholds); 475 bplist_destroy(&ds->ds_pending_deadlist); 476 dsl_deadlist_close(&ds->ds_deadlist); 477 kmem_free(ds, sizeof (dsl_dataset_t)); 478 dmu_buf_rele(dbuf, tag); 479 return (err); 480 } 481 482 if (!ds->ds_is_snapshot) { 483 ds->ds_snapname[0] = '\0'; 484 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 485 err = dsl_dataset_hold_obj(dp, 486 dsl_dataset_phys(ds)->ds_prev_snap_obj, 487 ds, &ds->ds_prev); 488 } 489 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 490 int zaperr = zap_lookup(mos, ds->ds_object, 491 DS_FIELD_BOOKMARK_NAMES, 492 sizeof (ds->ds_bookmarks), 1, 493 &ds->ds_bookmarks); 494 if (zaperr != ENOENT) 495 VERIFY0(zaperr); 496 } 497 } else { 498 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 499 err = dsl_dataset_get_snapname(ds); 500 if (err == 0 && 501 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 502 err = zap_count( 503 ds->ds_dir->dd_pool->dp_meta_objset, 504 dsl_dataset_phys(ds)->ds_userrefs_obj, 505 &ds->ds_userrefs); 506 } 507 } 508 509 if (err == 0 && !ds->ds_is_snapshot) { 510 err = dsl_prop_get_int_ds(ds, 511 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 512 &ds->ds_reserved); 513 if (err == 0) { 514 err = dsl_prop_get_int_ds(ds, 515 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 516 &ds->ds_quota); 517 } 518 } else { 519 ds->ds_reserved = ds->ds_quota = 0; 520 } 521 522 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 523 if (err == 0) 524 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 525 526 if (err != 0 || winner != NULL) { 527 bplist_destroy(&ds->ds_pending_deadlist); 528 dsl_deadlist_close(&ds->ds_deadlist); 529 if (ds->ds_prev) 530 dsl_dataset_rele(ds->ds_prev, ds); 531 dsl_dir_rele(ds->ds_dir, ds); 532 mutex_destroy(&ds->ds_lock); 533 mutex_destroy(&ds->ds_opening_lock); 534 mutex_destroy(&ds->ds_sendstream_lock); 535 refcount_destroy(&ds->ds_longholds); 536 kmem_free(ds, sizeof (dsl_dataset_t)); 537 if (err != 0) { 538 dmu_buf_rele(dbuf, tag); 539 return (err); 540 } 541 ds = winner; 542 } else { 543 ds->ds_fsid_guid = 544 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 545 } 546 } 547 ASSERT3P(ds->ds_dbuf, ==, dbuf); 548 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 549 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 550 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 551 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 552 *dsp = ds; 553 return (0); 554} 555 556int 557dsl_dataset_hold(dsl_pool_t *dp, const char *name, 558 void *tag, dsl_dataset_t **dsp) 559{ 560 dsl_dir_t *dd; 561 const char *snapname; 562 uint64_t obj; 563 int err = 0; 564 dsl_dataset_t *ds; 565 566 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 567 if (err != 0) 568 return (err); 569 570 ASSERT(dsl_pool_config_held(dp)); 571 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 572 if (obj != 0) 573 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 574 else 575 err = SET_ERROR(ENOENT); 576 577 /* we may be looking for a snapshot */ 578 if (err == 0 && snapname != NULL) { 579 dsl_dataset_t *snap_ds; 580 581 if (*snapname++ != '@') { 582 dsl_dataset_rele(ds, tag); 583 dsl_dir_rele(dd, FTAG); 584 return (SET_ERROR(ENOENT)); 585 } 586 587 dprintf("looking for snapshot '%s'\n", snapname); 588 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 589 if (err == 0) 590 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 591 dsl_dataset_rele(ds, tag); 592 593 if (err == 0) { 594 mutex_enter(&snap_ds->ds_lock); 595 if (snap_ds->ds_snapname[0] == 0) 596 (void) strlcpy(snap_ds->ds_snapname, snapname, 597 sizeof (snap_ds->ds_snapname)); 598 mutex_exit(&snap_ds->ds_lock); 599 ds = snap_ds; 600 } 601 } 602 if (err == 0) 603 *dsp = ds; 604 dsl_dir_rele(dd, FTAG); 605 return (err); 606} 607 608int 609dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 610 void *tag, dsl_dataset_t **dsp) 611{ 612 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 613 if (err != 0) 614 return (err); 615 if (!dsl_dataset_tryown(*dsp, tag)) { 616 dsl_dataset_rele(*dsp, tag); 617 *dsp = NULL; 618 return (SET_ERROR(EBUSY)); 619 } 620 return (0); 621} 622 623int 624dsl_dataset_own(dsl_pool_t *dp, const char *name, 625 void *tag, dsl_dataset_t **dsp) 626{ 627 int err = dsl_dataset_hold(dp, name, tag, dsp); 628 if (err != 0) 629 return (err); 630 if (!dsl_dataset_tryown(*dsp, tag)) { 631 dsl_dataset_rele(*dsp, tag); 632 return (SET_ERROR(EBUSY)); 633 } 634 return (0); 635} 636 637/* 638 * See the comment above dsl_pool_hold() for details. In summary, a long 639 * hold is used to prevent destruction of a dataset while the pool hold 640 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 641 * 642 * The dataset and pool must be held when this function is called. After it 643 * is called, the pool hold may be released while the dataset is still held 644 * and accessed. 645 */ 646void 647dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 648{ 649 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 650 (void) refcount_add(&ds->ds_longholds, tag); 651} 652 653void 654dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 655{ 656 (void) refcount_remove(&ds->ds_longholds, tag); 657} 658 659/* Return B_TRUE if there are any long holds on this dataset. */ 660boolean_t 661dsl_dataset_long_held(dsl_dataset_t *ds) 662{ 663 return (!refcount_is_zero(&ds->ds_longholds)); 664} 665 666void 667dsl_dataset_name(dsl_dataset_t *ds, char *name) 668{ 669 if (ds == NULL) { 670 (void) strcpy(name, "mos"); 671 } else { 672 dsl_dir_name(ds->ds_dir, name); 673 VERIFY0(dsl_dataset_get_snapname(ds)); 674 if (ds->ds_snapname[0]) { 675 (void) strcat(name, "@"); 676 /* 677 * We use a "recursive" mutex so that we 678 * can call dprintf_ds() with ds_lock held. 679 */ 680 if (!MUTEX_HELD(&ds->ds_lock)) { 681 mutex_enter(&ds->ds_lock); 682 (void) strcat(name, ds->ds_snapname); 683 mutex_exit(&ds->ds_lock); 684 } else { 685 (void) strcat(name, ds->ds_snapname); 686 } 687 } 688 } 689} 690 691void 692dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 693{ 694 dmu_buf_rele(ds->ds_dbuf, tag); 695} 696 697void 698dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 699{ 700 ASSERT3P(ds->ds_owner, ==, tag); 701 ASSERT(ds->ds_dbuf != NULL); 702 703 mutex_enter(&ds->ds_lock); 704 ds->ds_owner = NULL; 705 mutex_exit(&ds->ds_lock); 706 dsl_dataset_long_rele(ds, tag); 707 dsl_dataset_rele(ds, tag); 708} 709 710boolean_t 711dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 712{ 713 boolean_t gotit = FALSE; 714 715 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 716 mutex_enter(&ds->ds_lock); 717 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 718 ds->ds_owner = tag; 719 dsl_dataset_long_hold(ds, tag); 720 gotit = TRUE; 721 } 722 mutex_exit(&ds->ds_lock); 723 return (gotit); 724} 725 726boolean_t 727dsl_dataset_has_owner(dsl_dataset_t *ds) 728{ 729 boolean_t rv; 730 mutex_enter(&ds->ds_lock); 731 rv = (ds->ds_owner != NULL); 732 mutex_exit(&ds->ds_lock); 733 return (rv); 734} 735 736static void 737dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 738{ 739 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 740 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 741 uint64_t zero = 0; 742 743 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 744 745 spa_feature_incr(spa, f, tx); 746 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 747 748 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 749 sizeof (zero), 1, &zero, tx)); 750} 751 752void 753dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 754{ 755 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 756 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 757 758 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 759 760 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 761 spa_feature_decr(spa, f, tx); 762} 763 764uint64_t 765dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 766 uint64_t flags, dmu_tx_t *tx) 767{ 768 dsl_pool_t *dp = dd->dd_pool; 769 dmu_buf_t *dbuf; 770 dsl_dataset_phys_t *dsphys; 771 uint64_t dsobj; 772 objset_t *mos = dp->dp_meta_objset; 773 774 if (origin == NULL) 775 origin = dp->dp_origin_snap; 776 777 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 778 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 779 ASSERT(dmu_tx_is_syncing(tx)); 780 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 781 782 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 783 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 784 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 785 dmu_buf_will_dirty(dbuf, tx); 786 dsphys = dbuf->db_data; 787 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 788 dsphys->ds_dir_obj = dd->dd_object; 789 dsphys->ds_flags = flags; 790 dsphys->ds_fsid_guid = unique_create(); 791 do { 792 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 793 sizeof (dsphys->ds_guid)); 794 } while (dsphys->ds_guid == 0); 795 dsphys->ds_snapnames_zapobj = 796 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 797 DMU_OT_NONE, 0, tx); 798 dsphys->ds_creation_time = gethrestime_sec(); 799 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 800 801 if (origin == NULL) { 802 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 803 } else { 804 dsl_dataset_t *ohds; /* head of the origin snapshot */ 805 806 dsphys->ds_prev_snap_obj = origin->ds_object; 807 dsphys->ds_prev_snap_txg = 808 dsl_dataset_phys(origin)->ds_creation_txg; 809 dsphys->ds_referenced_bytes = 810 dsl_dataset_phys(origin)->ds_referenced_bytes; 811 dsphys->ds_compressed_bytes = 812 dsl_dataset_phys(origin)->ds_compressed_bytes; 813 dsphys->ds_uncompressed_bytes = 814 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 815 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 816 817 /* 818 * Inherit flags that describe the dataset's contents 819 * (INCONSISTENT) or properties (Case Insensitive). 820 */ 821 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 822 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 823 824 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 825 if (origin->ds_feature_inuse[f]) 826 dsl_dataset_activate_feature(dsobj, f, tx); 827 } 828 829 dmu_buf_will_dirty(origin->ds_dbuf, tx); 830 dsl_dataset_phys(origin)->ds_num_children++; 831 832 VERIFY0(dsl_dataset_hold_obj(dp, 833 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 834 FTAG, &ohds)); 835 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 836 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 837 dsl_dataset_rele(ohds, FTAG); 838 839 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 840 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 841 dsl_dataset_phys(origin)->ds_next_clones_obj = 842 zap_create(mos, 843 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 844 } 845 VERIFY0(zap_add_int(mos, 846 dsl_dataset_phys(origin)->ds_next_clones_obj, 847 dsobj, tx)); 848 } 849 850 dmu_buf_will_dirty(dd->dd_dbuf, tx); 851 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 852 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 853 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 854 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 855 dsl_dir_phys(origin->ds_dir)->dd_clones = 856 zap_create(mos, 857 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 858 } 859 VERIFY0(zap_add_int(mos, 860 dsl_dir_phys(origin->ds_dir)->dd_clones, 861 dsobj, tx)); 862 } 863 } 864 865 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 866 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 867 868 dmu_buf_rele(dbuf, FTAG); 869 870 dmu_buf_will_dirty(dd->dd_dbuf, tx); 871 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 872 873 return (dsobj); 874} 875 876static void 877dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 878{ 879 objset_t *os; 880 881 VERIFY0(dmu_objset_from_ds(ds, &os)); 882 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 883 dsl_dataset_dirty(ds, tx); 884} 885 886uint64_t 887dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 888 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 889{ 890 dsl_pool_t *dp = pdd->dd_pool; 891 uint64_t dsobj, ddobj; 892 dsl_dir_t *dd; 893 894 ASSERT(dmu_tx_is_syncing(tx)); 895 ASSERT(lastname[0] != '@'); 896 897 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 898 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 899 900 dsobj = dsl_dataset_create_sync_dd(dd, origin, 901 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 902 903 dsl_deleg_set_create_perms(dd, tx, cr); 904 905 /* 906 * Since we're creating a new node we know it's a leaf, so we can 907 * initialize the counts if the limit feature is active. 908 */ 909 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 910 uint64_t cnt = 0; 911 objset_t *os = dd->dd_pool->dp_meta_objset; 912 913 dsl_dir_zapify(dd, tx); 914 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 915 sizeof (cnt), 1, &cnt, tx)); 916 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 917 sizeof (cnt), 1, &cnt, tx)); 918 } 919 920 dsl_dir_rele(dd, FTAG); 921 922 /* 923 * If we are creating a clone, make sure we zero out any stale 924 * data from the origin snapshots zil header. 925 */ 926 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 927 dsl_dataset_t *ds; 928 929 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 930 dsl_dataset_zero_zil(ds, tx); 931 dsl_dataset_rele(ds, FTAG); 932 } 933 934 return (dsobj); 935} 936 937#ifdef __FreeBSD__ 938/* FreeBSD ioctl compat begin */ 939struct destroyarg { 940 nvlist_t *nvl; 941 const char *snapname; 942}; 943 944static int 945dsl_check_snap_cb(const char *name, void *arg) 946{ 947 struct destroyarg *da = arg; 948 dsl_dataset_t *ds; 949 char *dsname; 950 951 dsname = kmem_asprintf("%s@%s", name, da->snapname); 952 fnvlist_add_boolean(da->nvl, dsname); 953 kmem_free(dsname, strlen(dsname) + 1); 954 955 return (0); 956} 957 958int 959dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 960 nvlist_t *snaps) 961{ 962 struct destroyarg *da; 963 int err; 964 965 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 966 da->nvl = snaps; 967 da->snapname = snapname; 968 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 969 DS_FIND_CHILDREN); 970 kmem_free(da, sizeof (struct destroyarg)); 971 972 return (err); 973} 974/* FreeBSD ioctl compat end */ 975#endif /* __FreeBSD__ */ 976 977/* 978 * The unique space in the head dataset can be calculated by subtracting 979 * the space used in the most recent snapshot, that is still being used 980 * in this file system, from the space currently in use. To figure out 981 * the space in the most recent snapshot still in use, we need to take 982 * the total space used in the snapshot and subtract out the space that 983 * has been freed up since the snapshot was taken. 984 */ 985void 986dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 987{ 988 uint64_t mrs_used; 989 uint64_t dlused, dlcomp, dluncomp; 990 991 ASSERT(!ds->ds_is_snapshot); 992 993 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 994 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 995 else 996 mrs_used = 0; 997 998 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 999 1000 ASSERT3U(dlused, <=, mrs_used); 1001 dsl_dataset_phys(ds)->ds_unique_bytes = 1002 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 1003 1004 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1005 SPA_VERSION_UNIQUE_ACCURATE) 1006 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1007} 1008 1009void 1010dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1011 dmu_tx_t *tx) 1012{ 1013 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1014 uint64_t count; 1015 int err; 1016 1017 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1018 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1019 obj, tx); 1020 /* 1021 * The err should not be ENOENT, but a bug in a previous version 1022 * of the code could cause upgrade_clones_cb() to not set 1023 * ds_next_snap_obj when it should, leading to a missing entry. 1024 * If we knew that the pool was created after 1025 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1026 * ENOENT. However, at least we can check that we don't have 1027 * too many entries in the next_clones_obj even after failing to 1028 * remove this one. 1029 */ 1030 if (err != ENOENT) 1031 VERIFY0(err); 1032 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1033 &count)); 1034 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1035} 1036 1037 1038blkptr_t * 1039dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1040{ 1041 return (&dsl_dataset_phys(ds)->ds_bp); 1042} 1043 1044void 1045dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1046{ 1047 ASSERT(dmu_tx_is_syncing(tx)); 1048 /* If it's the meta-objset, set dp_meta_rootbp */ 1049 if (ds == NULL) { 1050 tx->tx_pool->dp_meta_rootbp = *bp; 1051 } else { 1052 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1053 dsl_dataset_phys(ds)->ds_bp = *bp; 1054 } 1055} 1056 1057spa_t * 1058dsl_dataset_get_spa(dsl_dataset_t *ds) 1059{ 1060 return (ds->ds_dir->dd_pool->dp_spa); 1061} 1062 1063void 1064dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1065{ 1066 dsl_pool_t *dp; 1067 1068 if (ds == NULL) /* this is the meta-objset */ 1069 return; 1070 1071 ASSERT(ds->ds_objset != NULL); 1072 1073 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1074 panic("dirtying snapshot!"); 1075 1076 dp = ds->ds_dir->dd_pool; 1077 1078 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1079 /* up the hold count until we can be written out */ 1080 dmu_buf_add_ref(ds->ds_dbuf, ds); 1081 } 1082} 1083 1084boolean_t 1085dsl_dataset_is_dirty(dsl_dataset_t *ds) 1086{ 1087 for (int t = 0; t < TXG_SIZE; t++) { 1088 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1089 ds, t)) 1090 return (B_TRUE); 1091 } 1092 return (B_FALSE); 1093} 1094 1095static int 1096dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1097{ 1098 uint64_t asize; 1099 1100 if (!dmu_tx_is_syncing(tx)) 1101 return (0); 1102 1103 /* 1104 * If there's an fs-only reservation, any blocks that might become 1105 * owned by the snapshot dataset must be accommodated by space 1106 * outside of the reservation. 1107 */ 1108 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1109 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1110 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1111 return (SET_ERROR(ENOSPC)); 1112 1113 /* 1114 * Propagate any reserved space for this snapshot to other 1115 * snapshot checks in this sync group. 1116 */ 1117 if (asize > 0) 1118 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1119 1120 return (0); 1121} 1122 1123typedef struct dsl_dataset_snapshot_arg { 1124 nvlist_t *ddsa_snaps; 1125 nvlist_t *ddsa_props; 1126 nvlist_t *ddsa_errors; 1127 cred_t *ddsa_cr; 1128} dsl_dataset_snapshot_arg_t; 1129 1130int 1131dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1132 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1133{ 1134 int error; 1135 uint64_t value; 1136 1137 ds->ds_trysnap_txg = tx->tx_txg; 1138 1139 if (!dmu_tx_is_syncing(tx)) 1140 return (0); 1141 1142 /* 1143 * We don't allow multiple snapshots of the same txg. If there 1144 * is already one, try again. 1145 */ 1146 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1147 return (SET_ERROR(EAGAIN)); 1148 1149 /* 1150 * Check for conflicting snapshot name. 1151 */ 1152 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1153 if (error == 0) 1154 return (SET_ERROR(EEXIST)); 1155 if (error != ENOENT) 1156 return (error); 1157 1158 /* 1159 * We don't allow taking snapshots of inconsistent datasets, such as 1160 * those into which we are currently receiving. However, if we are 1161 * creating this snapshot as part of a receive, this check will be 1162 * executed atomically with respect to the completion of the receive 1163 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1164 * case we ignore this, knowing it will be fixed up for us shortly in 1165 * dmu_recv_end_sync(). 1166 */ 1167 if (!recv && DS_IS_INCONSISTENT(ds)) 1168 return (SET_ERROR(EBUSY)); 1169 1170 /* 1171 * Skip the check for temporary snapshots or if we have already checked 1172 * the counts in dsl_dataset_snapshot_check. This means we really only 1173 * check the count here when we're receiving a stream. 1174 */ 1175 if (cnt != 0 && cr != NULL) { 1176 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1177 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1178 if (error != 0) 1179 return (error); 1180 } 1181 1182 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1183 if (error != 0) 1184 return (error); 1185 1186 return (0); 1187} 1188 1189static int 1190dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1191{ 1192 dsl_dataset_snapshot_arg_t *ddsa = arg; 1193 dsl_pool_t *dp = dmu_tx_pool(tx); 1194 nvpair_t *pair; 1195 int rv = 0; 1196 1197 /* 1198 * Pre-compute how many total new snapshots will be created for each 1199 * level in the tree and below. This is needed for validating the 1200 * snapshot limit when either taking a recursive snapshot or when 1201 * taking multiple snapshots. 1202 * 1203 * The problem is that the counts are not actually adjusted when 1204 * we are checking, only when we finally sync. For a single snapshot, 1205 * this is easy, the count will increase by 1 at each node up the tree, 1206 * but its more complicated for the recursive/multiple snapshot case. 1207 * 1208 * The dsl_fs_ss_limit_check function does recursively check the count 1209 * at each level up the tree but since it is validating each snapshot 1210 * independently we need to be sure that we are validating the complete 1211 * count for the entire set of snapshots. We do this by rolling up the 1212 * counts for each component of the name into an nvlist and then 1213 * checking each of those cases with the aggregated count. 1214 * 1215 * This approach properly handles not only the recursive snapshot 1216 * case (where we get all of those on the ddsa_snaps list) but also 1217 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1218 * validate the limit on 'a' using a count of 2). 1219 * 1220 * We validate the snapshot names in the third loop and only report 1221 * name errors once. 1222 */ 1223 if (dmu_tx_is_syncing(tx)) { 1224 nvlist_t *cnt_track = NULL; 1225 cnt_track = fnvlist_alloc(); 1226 1227 /* Rollup aggregated counts into the cnt_track list */ 1228 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1229 pair != NULL; 1230 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1231 char *pdelim; 1232 uint64_t val; 1233 char nm[MAXPATHLEN]; 1234 1235 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1236 pdelim = strchr(nm, '@'); 1237 if (pdelim == NULL) 1238 continue; 1239 *pdelim = '\0'; 1240 1241 do { 1242 if (nvlist_lookup_uint64(cnt_track, nm, 1243 &val) == 0) { 1244 /* update existing entry */ 1245 fnvlist_add_uint64(cnt_track, nm, 1246 val + 1); 1247 } else { 1248 /* add to list */ 1249 fnvlist_add_uint64(cnt_track, nm, 1); 1250 } 1251 1252 pdelim = strrchr(nm, '/'); 1253 if (pdelim != NULL) 1254 *pdelim = '\0'; 1255 } while (pdelim != NULL); 1256 } 1257 1258 /* Check aggregated counts at each level */ 1259 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1260 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1261 int error = 0; 1262 char *name; 1263 uint64_t cnt = 0; 1264 dsl_dataset_t *ds; 1265 1266 name = nvpair_name(pair); 1267 cnt = fnvpair_value_uint64(pair); 1268 ASSERT(cnt > 0); 1269 1270 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1271 if (error == 0) { 1272 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1273 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1274 ddsa->ddsa_cr); 1275 dsl_dataset_rele(ds, FTAG); 1276 } 1277 1278 if (error != 0) { 1279 if (ddsa->ddsa_errors != NULL) 1280 fnvlist_add_int32(ddsa->ddsa_errors, 1281 name, error); 1282 rv = error; 1283 /* only report one error for this check */ 1284 break; 1285 } 1286 } 1287 nvlist_free(cnt_track); 1288 } 1289 1290 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1291 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1292 int error = 0; 1293 dsl_dataset_t *ds; 1294 char *name, *atp; 1295 char dsname[MAXNAMELEN]; 1296 1297 name = nvpair_name(pair); 1298 if (strlen(name) >= MAXNAMELEN) 1299 error = SET_ERROR(ENAMETOOLONG); 1300 if (error == 0) { 1301 atp = strchr(name, '@'); 1302 if (atp == NULL) 1303 error = SET_ERROR(EINVAL); 1304 if (error == 0) 1305 (void) strlcpy(dsname, name, atp - name + 1); 1306 } 1307 if (error == 0) 1308 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1309 if (error == 0) { 1310 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1311 error = dsl_dataset_snapshot_check_impl(ds, 1312 atp + 1, tx, B_FALSE, 0, NULL); 1313 dsl_dataset_rele(ds, FTAG); 1314 } 1315 1316 if (error != 0) { 1317 if (ddsa->ddsa_errors != NULL) { 1318 fnvlist_add_int32(ddsa->ddsa_errors, 1319 name, error); 1320 } 1321 rv = error; 1322 } 1323 } 1324 1325 return (rv); 1326} 1327 1328void 1329dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1330 dmu_tx_t *tx) 1331{ 1332 static zil_header_t zero_zil; 1333 1334 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1335 dmu_buf_t *dbuf; 1336 dsl_dataset_phys_t *dsphys; 1337 uint64_t dsobj, crtxg; 1338 objset_t *mos = dp->dp_meta_objset; 1339 objset_t *os; 1340 1341 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1342 1343 /* 1344 * If we are on an old pool, the zil must not be active, in which 1345 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1346 */ 1347 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1348 dmu_objset_from_ds(ds, &os) != 0 || 1349 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1350 sizeof (zero_zil)) == 0); 1351 1352 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1353 1354 /* 1355 * The origin's ds_creation_txg has to be < TXG_INITIAL 1356 */ 1357 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1358 crtxg = 1; 1359 else 1360 crtxg = tx->tx_txg; 1361 1362 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1363 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1364 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1365 dmu_buf_will_dirty(dbuf, tx); 1366 dsphys = dbuf->db_data; 1367 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1368 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1369 dsphys->ds_fsid_guid = unique_create(); 1370 do { 1371 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1372 sizeof (dsphys->ds_guid)); 1373 } while (dsphys->ds_guid == 0); 1374 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1375 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1376 dsphys->ds_next_snap_obj = ds->ds_object; 1377 dsphys->ds_num_children = 1; 1378 dsphys->ds_creation_time = gethrestime_sec(); 1379 dsphys->ds_creation_txg = crtxg; 1380 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1381 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1382 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1383 dsphys->ds_uncompressed_bytes = 1384 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1385 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1386 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1387 dmu_buf_rele(dbuf, FTAG); 1388 1389 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1390 if (ds->ds_feature_inuse[f]) 1391 dsl_dataset_activate_feature(dsobj, f, tx); 1392 } 1393 1394 ASSERT3U(ds->ds_prev != 0, ==, 1395 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1396 if (ds->ds_prev) { 1397 uint64_t next_clones_obj = 1398 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1399 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1400 ds->ds_object || 1401 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1402 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1403 ds->ds_object) { 1404 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1405 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1406 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1407 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1408 } else if (next_clones_obj != 0) { 1409 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1410 dsphys->ds_next_snap_obj, tx); 1411 VERIFY0(zap_add_int(mos, 1412 next_clones_obj, dsobj, tx)); 1413 } 1414 } 1415 1416 /* 1417 * If we have a reference-reservation on this dataset, we will 1418 * need to increase the amount of refreservation being charged 1419 * since our unique space is going to zero. 1420 */ 1421 if (ds->ds_reserved) { 1422 int64_t delta; 1423 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1424 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1425 ds->ds_reserved); 1426 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1427 delta, 0, 0, tx); 1428 } 1429 1430 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1431 dsl_dataset_phys(ds)->ds_deadlist_obj = 1432 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1433 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1434 dsl_deadlist_close(&ds->ds_deadlist); 1435 dsl_deadlist_open(&ds->ds_deadlist, mos, 1436 dsl_dataset_phys(ds)->ds_deadlist_obj); 1437 dsl_deadlist_add_key(&ds->ds_deadlist, 1438 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1439 1440 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1441 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1442 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1443 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1444 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1445 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1446 1447 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1448 snapname, 8, 1, &dsobj, tx)); 1449 1450 if (ds->ds_prev) 1451 dsl_dataset_rele(ds->ds_prev, ds); 1452 VERIFY0(dsl_dataset_hold_obj(dp, 1453 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1454 1455 dsl_scan_ds_snapshotted(ds, tx); 1456 1457 dsl_dir_snap_cmtime_update(ds->ds_dir); 1458 1459 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1460} 1461 1462static void 1463dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1464{ 1465 dsl_dataset_snapshot_arg_t *ddsa = arg; 1466 dsl_pool_t *dp = dmu_tx_pool(tx); 1467 nvpair_t *pair; 1468 1469 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1470 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1471 dsl_dataset_t *ds; 1472 char *name, *atp; 1473 char dsname[MAXNAMELEN]; 1474 1475 name = nvpair_name(pair); 1476 atp = strchr(name, '@'); 1477 (void) strlcpy(dsname, name, atp - name + 1); 1478 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1479 1480 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1481 if (ddsa->ddsa_props != NULL) { 1482 dsl_props_set_sync_impl(ds->ds_prev, 1483 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1484 } 1485 dsl_dataset_rele(ds, FTAG); 1486 } 1487} 1488 1489/* 1490 * The snapshots must all be in the same pool. 1491 * All-or-nothing: if there are any failures, nothing will be modified. 1492 */ 1493int 1494dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1495{ 1496 dsl_dataset_snapshot_arg_t ddsa; 1497 nvpair_t *pair; 1498 boolean_t needsuspend; 1499 int error; 1500 spa_t *spa; 1501 char *firstname; 1502 nvlist_t *suspended = NULL; 1503 1504 pair = nvlist_next_nvpair(snaps, NULL); 1505 if (pair == NULL) 1506 return (0); 1507 firstname = nvpair_name(pair); 1508 1509 error = spa_open(firstname, &spa, FTAG); 1510 if (error != 0) 1511 return (error); 1512 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1513 spa_close(spa, FTAG); 1514 1515 if (needsuspend) { 1516 suspended = fnvlist_alloc(); 1517 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1518 pair = nvlist_next_nvpair(snaps, pair)) { 1519 char fsname[MAXNAMELEN]; 1520 char *snapname = nvpair_name(pair); 1521 char *atp; 1522 void *cookie; 1523 1524 atp = strchr(snapname, '@'); 1525 if (atp == NULL) { 1526 error = SET_ERROR(EINVAL); 1527 break; 1528 } 1529 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1530 1531 error = zil_suspend(fsname, &cookie); 1532 if (error != 0) 1533 break; 1534 fnvlist_add_uint64(suspended, fsname, 1535 (uintptr_t)cookie); 1536 } 1537 } 1538 1539 ddsa.ddsa_snaps = snaps; 1540 ddsa.ddsa_props = props; 1541 ddsa.ddsa_errors = errors; 1542 ddsa.ddsa_cr = CRED(); 1543 1544 if (error == 0) { 1545 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1546 dsl_dataset_snapshot_sync, &ddsa, 1547 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1548 } 1549 1550 if (suspended != NULL) { 1551 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1552 pair = nvlist_next_nvpair(suspended, pair)) { 1553 zil_resume((void *)(uintptr_t) 1554 fnvpair_value_uint64(pair)); 1555 } 1556 fnvlist_free(suspended); 1557 } 1558 1559#ifdef __FreeBSD__ 1560#ifdef _KERNEL 1561 if (error == 0) { 1562 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1563 pair = nvlist_next_nvpair(snaps, pair)) { 1564 char *snapname = nvpair_name(pair); 1565 zvol_create_minors(snapname); 1566 } 1567 } 1568#endif 1569#endif 1570 return (error); 1571} 1572 1573typedef struct dsl_dataset_snapshot_tmp_arg { 1574 const char *ddsta_fsname; 1575 const char *ddsta_snapname; 1576 minor_t ddsta_cleanup_minor; 1577 const char *ddsta_htag; 1578} dsl_dataset_snapshot_tmp_arg_t; 1579 1580static int 1581dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1582{ 1583 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1584 dsl_pool_t *dp = dmu_tx_pool(tx); 1585 dsl_dataset_t *ds; 1586 int error; 1587 1588 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1589 if (error != 0) 1590 return (error); 1591 1592 /* NULL cred means no limit check for tmp snapshot */ 1593 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1594 tx, B_FALSE, 0, NULL); 1595 if (error != 0) { 1596 dsl_dataset_rele(ds, FTAG); 1597 return (error); 1598 } 1599 1600 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1601 dsl_dataset_rele(ds, FTAG); 1602 return (SET_ERROR(ENOTSUP)); 1603 } 1604 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1605 B_TRUE, tx); 1606 if (error != 0) { 1607 dsl_dataset_rele(ds, FTAG); 1608 return (error); 1609 } 1610 1611 dsl_dataset_rele(ds, FTAG); 1612 return (0); 1613} 1614 1615static void 1616dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1617{ 1618 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1619 dsl_pool_t *dp = dmu_tx_pool(tx); 1620 dsl_dataset_t *ds; 1621 1622 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1623 1624 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1625 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1626 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1627 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1628 1629 dsl_dataset_rele(ds, FTAG); 1630} 1631 1632int 1633dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1634 minor_t cleanup_minor, const char *htag) 1635{ 1636 dsl_dataset_snapshot_tmp_arg_t ddsta; 1637 int error; 1638 spa_t *spa; 1639 boolean_t needsuspend; 1640 void *cookie; 1641 1642 ddsta.ddsta_fsname = fsname; 1643 ddsta.ddsta_snapname = snapname; 1644 ddsta.ddsta_cleanup_minor = cleanup_minor; 1645 ddsta.ddsta_htag = htag; 1646 1647 error = spa_open(fsname, &spa, FTAG); 1648 if (error != 0) 1649 return (error); 1650 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1651 spa_close(spa, FTAG); 1652 1653 if (needsuspend) { 1654 error = zil_suspend(fsname, &cookie); 1655 if (error != 0) 1656 return (error); 1657 } 1658 1659 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1660 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1661 1662 if (needsuspend) 1663 zil_resume(cookie); 1664 return (error); 1665} 1666 1667 1668void 1669dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1670{ 1671 ASSERT(dmu_tx_is_syncing(tx)); 1672 ASSERT(ds->ds_objset != NULL); 1673 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1674 1675 /* 1676 * in case we had to change ds_fsid_guid when we opened it, 1677 * sync it out now. 1678 */ 1679 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1680 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1681 1682 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1683 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1684 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1685 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1686 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1687 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1688 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1689 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1690 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1691 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1692 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1693 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1694 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1695 } 1696 1697 dmu_objset_sync(ds->ds_objset, zio, tx); 1698 1699 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1700 if (ds->ds_feature_activation_needed[f]) { 1701 if (ds->ds_feature_inuse[f]) 1702 continue; 1703 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1704 ds->ds_feature_inuse[f] = B_TRUE; 1705 } 1706 } 1707} 1708 1709static void 1710get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1711{ 1712 uint64_t count = 0; 1713 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1714 zap_cursor_t zc; 1715 zap_attribute_t za; 1716 nvlist_t *propval = fnvlist_alloc(); 1717 nvlist_t *val = fnvlist_alloc(); 1718 1719 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1720 1721 /* 1722 * There may be missing entries in ds_next_clones_obj 1723 * due to a bug in a previous version of the code. 1724 * Only trust it if it has the right number of entries. 1725 */ 1726 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1727 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1728 &count)); 1729 } 1730 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1731 goto fail; 1732 for (zap_cursor_init(&zc, mos, 1733 dsl_dataset_phys(ds)->ds_next_clones_obj); 1734 zap_cursor_retrieve(&zc, &za) == 0; 1735 zap_cursor_advance(&zc)) { 1736 dsl_dataset_t *clone; 1737 char buf[ZFS_MAXNAMELEN]; 1738 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1739 za.za_first_integer, FTAG, &clone)); 1740 dsl_dir_name(clone->ds_dir, buf); 1741 fnvlist_add_boolean(val, buf); 1742 dsl_dataset_rele(clone, FTAG); 1743 } 1744 zap_cursor_fini(&zc); 1745 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1746 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1747fail: 1748 nvlist_free(val); 1749 nvlist_free(propval); 1750} 1751 1752static void 1753get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1754{ 1755 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1756 1757 if (dsl_dataset_has_resume_receive_state(ds)) { 1758 char *str; 1759 void *packed; 1760 uint8_t *compressed; 1761 uint64_t val; 1762 nvlist_t *token_nv = fnvlist_alloc(); 1763 size_t packed_size, compressed_size; 1764 1765 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1766 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1767 fnvlist_add_uint64(token_nv, "fromguid", val); 1768 } 1769 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1770 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1771 fnvlist_add_uint64(token_nv, "object", val); 1772 } 1773 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1774 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1775 fnvlist_add_uint64(token_nv, "offset", val); 1776 } 1777 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1778 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1779 fnvlist_add_uint64(token_nv, "bytes", val); 1780 } 1781 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1782 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1783 fnvlist_add_uint64(token_nv, "toguid", val); 1784 } 1785 char buf[256]; 1786 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1787 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1788 fnvlist_add_string(token_nv, "toname", buf); 1789 } 1790 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1791 DS_FIELD_RESUME_EMBEDOK) == 0) { 1792 fnvlist_add_boolean(token_nv, "embedok"); 1793 } 1794 packed = fnvlist_pack(token_nv, &packed_size); 1795 fnvlist_free(token_nv); 1796 compressed = kmem_alloc(packed_size, KM_SLEEP); 1797 1798 compressed_size = gzip_compress(packed, compressed, 1799 packed_size, packed_size, 6); 1800 1801 zio_cksum_t cksum; 1802 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1803 1804 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1805 for (int i = 0; i < compressed_size; i++) { 1806 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1807 } 1808 str[compressed_size * 2] = '\0'; 1809 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1810 ZFS_SEND_RESUME_TOKEN_VERSION, 1811 (longlong_t)cksum.zc_word[0], 1812 (longlong_t)packed_size, str); 1813 dsl_prop_nvlist_add_string(nv, 1814 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1815 kmem_free(packed, packed_size); 1816 kmem_free(str, compressed_size * 2 + 1); 1817 kmem_free(compressed, packed_size); 1818 strfree(propval); 1819 } 1820} 1821 1822void 1823dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1824{ 1825 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1826 uint64_t refd, avail, uobjs, aobjs, ratio; 1827 1828 ASSERT(dsl_pool_config_held(dp)); 1829 1830 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1831 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1832 dsl_dataset_phys(ds)->ds_compressed_bytes); 1833 1834 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1835 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1836 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1837 1838 if (ds->ds_is_snapshot) { 1839 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1840 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1841 dsl_dataset_phys(ds)->ds_unique_bytes); 1842 get_clones_stat(ds, nv); 1843 } else { 1844 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1845 char buf[MAXNAMELEN]; 1846 dsl_dataset_name(ds->ds_prev, buf); 1847 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1848 } 1849 1850 dsl_dir_stats(ds->ds_dir, nv); 1851 } 1852 1853 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1854 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1855 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1856 1857 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1858 dsl_dataset_phys(ds)->ds_creation_time); 1859 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1860 dsl_dataset_phys(ds)->ds_creation_txg); 1861 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1862 ds->ds_quota); 1863 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1864 ds->ds_reserved); 1865 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1866 dsl_dataset_phys(ds)->ds_guid); 1867 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1868 dsl_dataset_phys(ds)->ds_unique_bytes); 1869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1870 ds->ds_object); 1871 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1872 ds->ds_userrefs); 1873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1874 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1875 1876 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1877 uint64_t written, comp, uncomp; 1878 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1879 dsl_dataset_t *prev; 1880 1881 int err = dsl_dataset_hold_obj(dp, 1882 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1883 if (err == 0) { 1884 err = dsl_dataset_space_written(prev, ds, &written, 1885 &comp, &uncomp); 1886 dsl_dataset_rele(prev, FTAG); 1887 if (err == 0) { 1888 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1889 written); 1890 } 1891 } 1892 } 1893 1894 if (!dsl_dataset_is_snapshot(ds)) { 1895 /* 1896 * A failed "newfs" (e.g. full) resumable receive leaves 1897 * the stats set on this dataset. Check here for the prop. 1898 */ 1899 get_receive_resume_stats(ds, nv); 1900 1901 /* 1902 * A failed incremental resumable receive leaves the 1903 * stats set on our child named "%recv". Check the child 1904 * for the prop. 1905 */ 1906 char recvname[ZFS_MAXNAMELEN]; 1907 dsl_dataset_t *recv_ds; 1908 dsl_dataset_name(ds, recvname); 1909 (void) strcat(recvname, "/"); 1910 (void) strcat(recvname, recv_clone_name); 1911 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1912 get_receive_resume_stats(recv_ds, nv); 1913 dsl_dataset_rele(recv_ds, FTAG); 1914 } 1915 } 1916} 1917 1918void 1919dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1920{ 1921 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1922 ASSERT(dsl_pool_config_held(dp)); 1923 1924 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1925 stat->dds_inconsistent = 1926 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1927 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1928 stat->dds_origin[0] = '\0'; 1929 if (ds->ds_is_snapshot) { 1930 stat->dds_is_snapshot = B_TRUE; 1931 stat->dds_num_clones = 1932 dsl_dataset_phys(ds)->ds_num_children - 1; 1933 } else { 1934 stat->dds_is_snapshot = B_FALSE; 1935 stat->dds_num_clones = 0; 1936 1937 if (dsl_dir_is_clone(ds->ds_dir)) { 1938 dsl_dataset_t *ods; 1939 1940 VERIFY0(dsl_dataset_hold_obj(dp, 1941 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1942 FTAG, &ods)); 1943 dsl_dataset_name(ods, stat->dds_origin); 1944 dsl_dataset_rele(ods, FTAG); 1945 } 1946 } 1947} 1948 1949uint64_t 1950dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1951{ 1952 return (ds->ds_fsid_guid); 1953} 1954 1955void 1956dsl_dataset_space(dsl_dataset_t *ds, 1957 uint64_t *refdbytesp, uint64_t *availbytesp, 1958 uint64_t *usedobjsp, uint64_t *availobjsp) 1959{ 1960 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1961 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1962 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1963 *availbytesp += 1964 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1965 if (ds->ds_quota != 0) { 1966 /* 1967 * Adjust available bytes according to refquota 1968 */ 1969 if (*refdbytesp < ds->ds_quota) 1970 *availbytesp = MIN(*availbytesp, 1971 ds->ds_quota - *refdbytesp); 1972 else 1973 *availbytesp = 0; 1974 } 1975 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1976 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1977} 1978 1979boolean_t 1980dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1981{ 1982 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1983 1984 ASSERT(dsl_pool_config_held(dp)); 1985 if (snap == NULL) 1986 return (B_FALSE); 1987 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1988 dsl_dataset_phys(snap)->ds_creation_txg) { 1989 objset_t *os, *os_snap; 1990 /* 1991 * It may be that only the ZIL differs, because it was 1992 * reset in the head. Don't count that as being 1993 * modified. 1994 */ 1995 if (dmu_objset_from_ds(ds, &os) != 0) 1996 return (B_TRUE); 1997 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1998 return (B_TRUE); 1999 return (bcmp(&os->os_phys->os_meta_dnode, 2000 &os_snap->os_phys->os_meta_dnode, 2001 sizeof (os->os_phys->os_meta_dnode)) != 0); 2002 } 2003 return (B_FALSE); 2004} 2005 2006typedef struct dsl_dataset_rename_snapshot_arg { 2007 const char *ddrsa_fsname; 2008 const char *ddrsa_oldsnapname; 2009 const char *ddrsa_newsnapname; 2010 boolean_t ddrsa_recursive; 2011 dmu_tx_t *ddrsa_tx; 2012} dsl_dataset_rename_snapshot_arg_t; 2013 2014/* ARGSUSED */ 2015static int 2016dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2017 dsl_dataset_t *hds, void *arg) 2018{ 2019 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2020 int error; 2021 uint64_t val; 2022 2023 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2024 if (error != 0) { 2025 /* ignore nonexistent snapshots */ 2026 return (error == ENOENT ? 0 : error); 2027 } 2028 2029 /* new name should not exist */ 2030 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2031 if (error == 0) 2032 error = SET_ERROR(EEXIST); 2033 else if (error == ENOENT) 2034 error = 0; 2035 2036 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2037 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2038 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 2039 error = SET_ERROR(ENAMETOOLONG); 2040 2041 return (error); 2042} 2043 2044static int 2045dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2046{ 2047 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2048 dsl_pool_t *dp = dmu_tx_pool(tx); 2049 dsl_dataset_t *hds; 2050 int error; 2051 2052 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2053 if (error != 0) 2054 return (error); 2055 2056 if (ddrsa->ddrsa_recursive) { 2057 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2058 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2059 DS_FIND_CHILDREN); 2060 } else { 2061 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2062 } 2063 dsl_dataset_rele(hds, FTAG); 2064 return (error); 2065} 2066 2067static int 2068dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2069 dsl_dataset_t *hds, void *arg) 2070{ 2071#ifdef __FreeBSD__ 2072#ifdef _KERNEL 2073 char *oldname, *newname; 2074#endif 2075#endif 2076 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2077 dsl_dataset_t *ds; 2078 uint64_t val; 2079 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2080 int error; 2081 2082 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2083 ASSERT(error == 0 || error == ENOENT); 2084 if (error == ENOENT) { 2085 /* ignore nonexistent snapshots */ 2086 return (0); 2087 } 2088 2089 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2090 2091 /* log before we change the name */ 2092 spa_history_log_internal_ds(ds, "rename", tx, 2093 "-> @%s", ddrsa->ddrsa_newsnapname); 2094 2095 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2096 B_FALSE)); 2097 mutex_enter(&ds->ds_lock); 2098 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2099 mutex_exit(&ds->ds_lock); 2100 VERIFY0(zap_add(dp->dp_meta_objset, 2101 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2102 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2103 2104#ifdef __FreeBSD__ 2105#ifdef _KERNEL 2106 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2107 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2108 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2109 ddrsa->ddrsa_oldsnapname); 2110 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2111 ddrsa->ddrsa_newsnapname); 2112 zfsvfs_update_fromname(oldname, newname); 2113 zvol_rename_minors(oldname, newname); 2114 kmem_free(newname, MAXPATHLEN); 2115 kmem_free(oldname, MAXPATHLEN); 2116#endif 2117#endif 2118 dsl_dataset_rele(ds, FTAG); 2119 2120 return (0); 2121} 2122 2123static void 2124dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2125{ 2126 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2127 dsl_pool_t *dp = dmu_tx_pool(tx); 2128 dsl_dataset_t *hds; 2129 2130 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2131 ddrsa->ddrsa_tx = tx; 2132 if (ddrsa->ddrsa_recursive) { 2133 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2134 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2135 DS_FIND_CHILDREN)); 2136 } else { 2137 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2138 } 2139 dsl_dataset_rele(hds, FTAG); 2140} 2141 2142int 2143dsl_dataset_rename_snapshot(const char *fsname, 2144 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2145{ 2146 dsl_dataset_rename_snapshot_arg_t ddrsa; 2147 2148 ddrsa.ddrsa_fsname = fsname; 2149 ddrsa.ddrsa_oldsnapname = oldsnapname; 2150 ddrsa.ddrsa_newsnapname = newsnapname; 2151 ddrsa.ddrsa_recursive = recursive; 2152 2153 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2154 dsl_dataset_rename_snapshot_sync, &ddrsa, 2155 1, ZFS_SPACE_CHECK_RESERVED)); 2156} 2157 2158/* 2159 * If we're doing an ownership handoff, we need to make sure that there is 2160 * only one long hold on the dataset. We're not allowed to change anything here 2161 * so we don't permanently release the long hold or regular hold here. We want 2162 * to do this only when syncing to avoid the dataset unexpectedly going away 2163 * when we release the long hold. 2164 */ 2165static int 2166dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2167{ 2168 boolean_t held; 2169 2170 if (!dmu_tx_is_syncing(tx)) 2171 return (0); 2172 2173 if (owner != NULL) { 2174 VERIFY3P(ds->ds_owner, ==, owner); 2175 dsl_dataset_long_rele(ds, owner); 2176 } 2177 2178 held = dsl_dataset_long_held(ds); 2179 2180 if (owner != NULL) 2181 dsl_dataset_long_hold(ds, owner); 2182 2183 if (held) 2184 return (SET_ERROR(EBUSY)); 2185 2186 return (0); 2187} 2188 2189typedef struct dsl_dataset_rollback_arg { 2190 const char *ddra_fsname; 2191 void *ddra_owner; 2192 nvlist_t *ddra_result; 2193} dsl_dataset_rollback_arg_t; 2194 2195static int 2196dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2197{ 2198 dsl_dataset_rollback_arg_t *ddra = arg; 2199 dsl_pool_t *dp = dmu_tx_pool(tx); 2200 dsl_dataset_t *ds; 2201 int64_t unused_refres_delta; 2202 int error; 2203 2204 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2205 if (error != 0) 2206 return (error); 2207 2208 /* must not be a snapshot */ 2209 if (ds->ds_is_snapshot) { 2210 dsl_dataset_rele(ds, FTAG); 2211 return (SET_ERROR(EINVAL)); 2212 } 2213 2214 /* must have a most recent snapshot */ 2215 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2216 dsl_dataset_rele(ds, FTAG); 2217 return (SET_ERROR(EINVAL)); 2218 } 2219 2220 /* must not have any bookmarks after the most recent snapshot */ 2221 nvlist_t *proprequest = fnvlist_alloc(); 2222 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2223 nvlist_t *bookmarks = fnvlist_alloc(); 2224 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2225 fnvlist_free(proprequest); 2226 if (error != 0) 2227 return (error); 2228 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2229 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2230 nvlist_t *valuenv = 2231 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2232 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2233 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2234 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2235 fnvlist_free(bookmarks); 2236 dsl_dataset_rele(ds, FTAG); 2237 return (SET_ERROR(EEXIST)); 2238 } 2239 } 2240 fnvlist_free(bookmarks); 2241 2242 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2243 if (error != 0) { 2244 dsl_dataset_rele(ds, FTAG); 2245 return (error); 2246 } 2247 2248 /* 2249 * Check if the snap we are rolling back to uses more than 2250 * the refquota. 2251 */ 2252 if (ds->ds_quota != 0 && 2253 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2254 dsl_dataset_rele(ds, FTAG); 2255 return (SET_ERROR(EDQUOT)); 2256 } 2257 2258 /* 2259 * When we do the clone swap, we will temporarily use more space 2260 * due to the refreservation (the head will no longer have any 2261 * unique space, so the entire amount of the refreservation will need 2262 * to be free). We will immediately destroy the clone, freeing 2263 * this space, but the freeing happens over many txg's. 2264 */ 2265 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2266 dsl_dataset_phys(ds)->ds_unique_bytes); 2267 2268 if (unused_refres_delta > 0 && 2269 unused_refres_delta > 2270 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2271 dsl_dataset_rele(ds, FTAG); 2272 return (SET_ERROR(ENOSPC)); 2273 } 2274 2275 dsl_dataset_rele(ds, FTAG); 2276 return (0); 2277} 2278 2279static void 2280dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2281{ 2282 dsl_dataset_rollback_arg_t *ddra = arg; 2283 dsl_pool_t *dp = dmu_tx_pool(tx); 2284 dsl_dataset_t *ds, *clone; 2285 uint64_t cloneobj; 2286 char namebuf[ZFS_MAXNAMELEN]; 2287 2288 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2289 2290 dsl_dataset_name(ds->ds_prev, namebuf); 2291 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2292 2293 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2294 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2295 2296 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2297 2298 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2299 dsl_dataset_zero_zil(ds, tx); 2300 2301 dsl_destroy_head_sync_impl(clone, tx); 2302 2303 dsl_dataset_rele(clone, FTAG); 2304 dsl_dataset_rele(ds, FTAG); 2305} 2306 2307/* 2308 * Rolls back the given filesystem or volume to the most recent snapshot. 2309 * The name of the most recent snapshot will be returned under key "target" 2310 * in the result nvlist. 2311 * 2312 * If owner != NULL: 2313 * - The existing dataset MUST be owned by the specified owner at entry 2314 * - Upon return, dataset will still be held by the same owner, whether we 2315 * succeed or not. 2316 * 2317 * This mode is required any time the existing filesystem is mounted. See 2318 * notes above zfs_suspend_fs() for further details. 2319 */ 2320int 2321dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2322{ 2323 dsl_dataset_rollback_arg_t ddra; 2324 2325 ddra.ddra_fsname = fsname; 2326 ddra.ddra_owner = owner; 2327 ddra.ddra_result = result; 2328 2329 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2330 dsl_dataset_rollback_sync, &ddra, 2331 1, ZFS_SPACE_CHECK_RESERVED)); 2332} 2333 2334struct promotenode { 2335 list_node_t link; 2336 dsl_dataset_t *ds; 2337}; 2338 2339typedef struct dsl_dataset_promote_arg { 2340 const char *ddpa_clonename; 2341 dsl_dataset_t *ddpa_clone; 2342 list_t shared_snaps, origin_snaps, clone_snaps; 2343 dsl_dataset_t *origin_origin; /* origin of the origin */ 2344 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2345 char *err_ds; 2346 cred_t *cr; 2347} dsl_dataset_promote_arg_t; 2348 2349static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2350static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2351 void *tag); 2352static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2353 2354static int 2355dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2356{ 2357 dsl_dataset_promote_arg_t *ddpa = arg; 2358 dsl_pool_t *dp = dmu_tx_pool(tx); 2359 dsl_dataset_t *hds; 2360 struct promotenode *snap; 2361 dsl_dataset_t *origin_ds; 2362 int err; 2363 uint64_t unused; 2364 uint64_t ss_mv_cnt; 2365 size_t max_snap_len; 2366 2367 err = promote_hold(ddpa, dp, FTAG); 2368 if (err != 0) 2369 return (err); 2370 2371 hds = ddpa->ddpa_clone; 2372 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2373 2374 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2375 promote_rele(ddpa, FTAG); 2376 return (SET_ERROR(EXDEV)); 2377 } 2378 2379 /* 2380 * Compute and check the amount of space to transfer. Since this is 2381 * so expensive, don't do the preliminary check. 2382 */ 2383 if (!dmu_tx_is_syncing(tx)) { 2384 promote_rele(ddpa, FTAG); 2385 return (0); 2386 } 2387 2388 snap = list_head(&ddpa->shared_snaps); 2389 origin_ds = snap->ds; 2390 2391 /* compute origin's new unique space */ 2392 snap = list_tail(&ddpa->clone_snaps); 2393 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2394 origin_ds->ds_object); 2395 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2396 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2397 &ddpa->unique, &unused, &unused); 2398 2399 /* 2400 * Walk the snapshots that we are moving 2401 * 2402 * Compute space to transfer. Consider the incremental changes 2403 * to used by each snapshot: 2404 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2405 * So each snapshot gave birth to: 2406 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2407 * So a sequence would look like: 2408 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2409 * Which simplifies to: 2410 * uN + kN + kN-1 + ... + k1 + k0 2411 * Note however, if we stop before we reach the ORIGIN we get: 2412 * uN + kN + kN-1 + ... + kM - uM-1 2413 */ 2414 ss_mv_cnt = 0; 2415 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2416 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2417 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2418 for (snap = list_head(&ddpa->shared_snaps); snap; 2419 snap = list_next(&ddpa->shared_snaps, snap)) { 2420 uint64_t val, dlused, dlcomp, dluncomp; 2421 dsl_dataset_t *ds = snap->ds; 2422 2423 ss_mv_cnt++; 2424 2425 /* 2426 * If there are long holds, we won't be able to evict 2427 * the objset. 2428 */ 2429 if (dsl_dataset_long_held(ds)) { 2430 err = SET_ERROR(EBUSY); 2431 goto out; 2432 } 2433 2434 /* Check that the snapshot name does not conflict */ 2435 VERIFY0(dsl_dataset_get_snapname(ds)); 2436 if (strlen(ds->ds_snapname) >= max_snap_len) { 2437 err = SET_ERROR(ENAMETOOLONG); 2438 goto out; 2439 } 2440 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2441 if (err == 0) { 2442 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2443 err = SET_ERROR(EEXIST); 2444 goto out; 2445 } 2446 if (err != ENOENT) 2447 goto out; 2448 2449 /* The very first snapshot does not have a deadlist */ 2450 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2451 continue; 2452 2453 dsl_deadlist_space(&ds->ds_deadlist, 2454 &dlused, &dlcomp, &dluncomp); 2455 ddpa->used += dlused; 2456 ddpa->comp += dlcomp; 2457 ddpa->uncomp += dluncomp; 2458 } 2459 2460 /* 2461 * If we are a clone of a clone then we never reached ORIGIN, 2462 * so we need to subtract out the clone origin's used space. 2463 */ 2464 if (ddpa->origin_origin) { 2465 ddpa->used -= 2466 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2467 ddpa->comp -= 2468 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2469 ddpa->uncomp -= 2470 dsl_dataset_phys(ddpa->origin_origin)-> 2471 ds_uncompressed_bytes; 2472 } 2473 2474 /* Check that there is enough space and limit headroom here */ 2475 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2476 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2477 if (err != 0) 2478 goto out; 2479 2480 /* 2481 * Compute the amounts of space that will be used by snapshots 2482 * after the promotion (for both origin and clone). For each, 2483 * it is the amount of space that will be on all of their 2484 * deadlists (that was not born before their new origin). 2485 */ 2486 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2487 uint64_t space; 2488 2489 /* 2490 * Note, typically this will not be a clone of a clone, 2491 * so dd_origin_txg will be < TXG_INITIAL, so 2492 * these snaplist_space() -> dsl_deadlist_space_range() 2493 * calls will be fast because they do not have to 2494 * iterate over all bps. 2495 */ 2496 snap = list_head(&ddpa->origin_snaps); 2497 err = snaplist_space(&ddpa->shared_snaps, 2498 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2499 if (err != 0) 2500 goto out; 2501 2502 err = snaplist_space(&ddpa->clone_snaps, 2503 snap->ds->ds_dir->dd_origin_txg, &space); 2504 if (err != 0) 2505 goto out; 2506 ddpa->cloneusedsnap += space; 2507 } 2508 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2509 DD_FLAG_USED_BREAKDOWN) { 2510 err = snaplist_space(&ddpa->origin_snaps, 2511 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2512 &ddpa->originusedsnap); 2513 if (err != 0) 2514 goto out; 2515 } 2516 2517out: 2518 promote_rele(ddpa, FTAG); 2519 return (err); 2520} 2521 2522static void 2523dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2524{ 2525 dsl_dataset_promote_arg_t *ddpa = arg; 2526 dsl_pool_t *dp = dmu_tx_pool(tx); 2527 dsl_dataset_t *hds; 2528 struct promotenode *snap; 2529 dsl_dataset_t *origin_ds; 2530 dsl_dataset_t *origin_head; 2531 dsl_dir_t *dd; 2532 dsl_dir_t *odd = NULL; 2533 uint64_t oldnext_obj; 2534 int64_t delta; 2535#if defined(__FreeBSD__) && defined(_KERNEL) 2536 char *oldname, *newname; 2537#endif 2538 2539 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2540 hds = ddpa->ddpa_clone; 2541 2542 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2543 2544 snap = list_head(&ddpa->shared_snaps); 2545 origin_ds = snap->ds; 2546 dd = hds->ds_dir; 2547 2548 snap = list_head(&ddpa->origin_snaps); 2549 origin_head = snap->ds; 2550 2551 /* 2552 * We need to explicitly open odd, since origin_ds's dd will be 2553 * changing. 2554 */ 2555 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2556 NULL, FTAG, &odd)); 2557 2558 /* change origin's next snap */ 2559 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2560 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2561 snap = list_tail(&ddpa->clone_snaps); 2562 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2563 origin_ds->ds_object); 2564 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2565 2566 /* change the origin's next clone */ 2567 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2568 dsl_dataset_remove_from_next_clones(origin_ds, 2569 snap->ds->ds_object, tx); 2570 VERIFY0(zap_add_int(dp->dp_meta_objset, 2571 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2572 oldnext_obj, tx)); 2573 } 2574 2575 /* change origin */ 2576 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2577 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2578 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2579 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2580 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2581 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2582 origin_head->ds_dir->dd_origin_txg = 2583 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2584 2585 /* change dd_clone entries */ 2586 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2587 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2588 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2589 VERIFY0(zap_add_int(dp->dp_meta_objset, 2590 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2591 hds->ds_object, tx)); 2592 2593 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2594 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2595 origin_head->ds_object, tx)); 2596 if (dsl_dir_phys(dd)->dd_clones == 0) { 2597 dsl_dir_phys(dd)->dd_clones = 2598 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2599 DMU_OT_NONE, 0, tx); 2600 } 2601 VERIFY0(zap_add_int(dp->dp_meta_objset, 2602 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2603 } 2604 2605#if defined(__FreeBSD__) && defined(_KERNEL) 2606 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2607 mutex_enter(&spa_namespace_lock); 2608 2609 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2610 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2611#endif 2612 2613 /* move snapshots to this dir */ 2614 for (snap = list_head(&ddpa->shared_snaps); snap; 2615 snap = list_next(&ddpa->shared_snaps, snap)) { 2616 dsl_dataset_t *ds = snap->ds; 2617 2618 /* 2619 * Property callbacks are registered to a particular 2620 * dsl_dir. Since ours is changing, evict the objset 2621 * so that they will be unregistered from the old dsl_dir. 2622 */ 2623 if (ds->ds_objset) { 2624 dmu_objset_evict(ds->ds_objset); 2625 ds->ds_objset = NULL; 2626 } 2627 2628 /* move snap name entry */ 2629 VERIFY0(dsl_dataset_get_snapname(ds)); 2630 VERIFY0(dsl_dataset_snap_remove(origin_head, 2631 ds->ds_snapname, tx, B_TRUE)); 2632 VERIFY0(zap_add(dp->dp_meta_objset, 2633 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2634 8, 1, &ds->ds_object, tx)); 2635 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2636 DD_FIELD_SNAPSHOT_COUNT, tx); 2637 2638 /* change containing dsl_dir */ 2639 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2640 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2641 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2642 ASSERT3P(ds->ds_dir, ==, odd); 2643 dsl_dir_rele(ds->ds_dir, ds); 2644 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2645 NULL, ds, &ds->ds_dir)); 2646 2647#if defined(__FreeBSD__) && defined(_KERNEL) 2648 dsl_dataset_name(ds, newname); 2649 zfsvfs_update_fromname(oldname, newname); 2650 zvol_rename_minors(oldname, newname); 2651#endif 2652 2653 /* move any clone references */ 2654 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2655 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2656 zap_cursor_t zc; 2657 zap_attribute_t za; 2658 2659 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2660 dsl_dataset_phys(ds)->ds_next_clones_obj); 2661 zap_cursor_retrieve(&zc, &za) == 0; 2662 zap_cursor_advance(&zc)) { 2663 dsl_dataset_t *cnds; 2664 uint64_t o; 2665 2666 if (za.za_first_integer == oldnext_obj) { 2667 /* 2668 * We've already moved the 2669 * origin's reference. 2670 */ 2671 continue; 2672 } 2673 2674 VERIFY0(dsl_dataset_hold_obj(dp, 2675 za.za_first_integer, FTAG, &cnds)); 2676 o = dsl_dir_phys(cnds->ds_dir)-> 2677 dd_head_dataset_obj; 2678 2679 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2680 dsl_dir_phys(odd)->dd_clones, o, tx)); 2681 VERIFY0(zap_add_int(dp->dp_meta_objset, 2682 dsl_dir_phys(dd)->dd_clones, o, tx)); 2683 dsl_dataset_rele(cnds, FTAG); 2684 } 2685 zap_cursor_fini(&zc); 2686 } 2687 2688 ASSERT(!dsl_prop_hascb(ds)); 2689 } 2690 2691#if defined(__FreeBSD__) && defined(_KERNEL) 2692 mutex_exit(&spa_namespace_lock); 2693 2694 kmem_free(newname, MAXPATHLEN); 2695 kmem_free(oldname, MAXPATHLEN); 2696#endif 2697 /* 2698 * Change space accounting. 2699 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2700 * both be valid, or both be 0 (resulting in delta == 0). This 2701 * is true for each of {clone,origin} independently. 2702 */ 2703 2704 delta = ddpa->cloneusedsnap - 2705 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2706 ASSERT3S(delta, >=, 0); 2707 ASSERT3U(ddpa->used, >=, delta); 2708 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2709 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2710 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2711 2712 delta = ddpa->originusedsnap - 2713 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2714 ASSERT3S(delta, <=, 0); 2715 ASSERT3U(ddpa->used, >=, -delta); 2716 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2717 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2718 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2719 2720 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2721 2722 /* log history record */ 2723 spa_history_log_internal_ds(hds, "promote", tx, ""); 2724 2725 dsl_dir_rele(odd, FTAG); 2726 promote_rele(ddpa, FTAG); 2727} 2728 2729/* 2730 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2731 * (exclusive) and last_obj (inclusive). The list will be in reverse 2732 * order (last_obj will be the list_head()). If first_obj == 0, do all 2733 * snapshots back to this dataset's origin. 2734 */ 2735static int 2736snaplist_make(dsl_pool_t *dp, 2737 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2738{ 2739 uint64_t obj = last_obj; 2740 2741 list_create(l, sizeof (struct promotenode), 2742 offsetof(struct promotenode, link)); 2743 2744 while (obj != first_obj) { 2745 dsl_dataset_t *ds; 2746 struct promotenode *snap; 2747 int err; 2748 2749 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2750 ASSERT(err != ENOENT); 2751 if (err != 0) 2752 return (err); 2753 2754 if (first_obj == 0) 2755 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2756 2757 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2758 snap->ds = ds; 2759 list_insert_tail(l, snap); 2760 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2761 } 2762 2763 return (0); 2764} 2765 2766static int 2767snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2768{ 2769 struct promotenode *snap; 2770 2771 *spacep = 0; 2772 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2773 uint64_t used, comp, uncomp; 2774 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2775 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2776 *spacep += used; 2777 } 2778 return (0); 2779} 2780 2781static void 2782snaplist_destroy(list_t *l, void *tag) 2783{ 2784 struct promotenode *snap; 2785 2786 if (l == NULL || !list_link_active(&l->list_head)) 2787 return; 2788 2789 while ((snap = list_tail(l)) != NULL) { 2790 list_remove(l, snap); 2791 dsl_dataset_rele(snap->ds, tag); 2792 kmem_free(snap, sizeof (*snap)); 2793 } 2794 list_destroy(l); 2795} 2796 2797static int 2798promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2799{ 2800 int error; 2801 dsl_dir_t *dd; 2802 struct promotenode *snap; 2803 2804 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2805 &ddpa->ddpa_clone); 2806 if (error != 0) 2807 return (error); 2808 dd = ddpa->ddpa_clone->ds_dir; 2809 2810 if (ddpa->ddpa_clone->ds_is_snapshot || 2811 !dsl_dir_is_clone(dd)) { 2812 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2813 return (SET_ERROR(EINVAL)); 2814 } 2815 2816 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2817 &ddpa->shared_snaps, tag); 2818 if (error != 0) 2819 goto out; 2820 2821 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2822 &ddpa->clone_snaps, tag); 2823 if (error != 0) 2824 goto out; 2825 2826 snap = list_head(&ddpa->shared_snaps); 2827 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2828 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2829 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2830 &ddpa->origin_snaps, tag); 2831 if (error != 0) 2832 goto out; 2833 2834 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2835 error = dsl_dataset_hold_obj(dp, 2836 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2837 tag, &ddpa->origin_origin); 2838 if (error != 0) 2839 goto out; 2840 } 2841out: 2842 if (error != 0) 2843 promote_rele(ddpa, tag); 2844 return (error); 2845} 2846 2847static void 2848promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2849{ 2850 snaplist_destroy(&ddpa->shared_snaps, tag); 2851 snaplist_destroy(&ddpa->clone_snaps, tag); 2852 snaplist_destroy(&ddpa->origin_snaps, tag); 2853 if (ddpa->origin_origin != NULL) 2854 dsl_dataset_rele(ddpa->origin_origin, tag); 2855 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2856} 2857 2858/* 2859 * Promote a clone. 2860 * 2861 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2862 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2863 */ 2864int 2865dsl_dataset_promote(const char *name, char *conflsnap) 2866{ 2867 dsl_dataset_promote_arg_t ddpa = { 0 }; 2868 uint64_t numsnaps; 2869 int error; 2870 objset_t *os; 2871 2872 /* 2873 * We will modify space proportional to the number of 2874 * snapshots. Compute numsnaps. 2875 */ 2876 error = dmu_objset_hold(name, FTAG, &os); 2877 if (error != 0) 2878 return (error); 2879 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2880 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2881 &numsnaps); 2882 dmu_objset_rele(os, FTAG); 2883 if (error != 0) 2884 return (error); 2885 2886 ddpa.ddpa_clonename = name; 2887 ddpa.err_ds = conflsnap; 2888 ddpa.cr = CRED(); 2889 2890 return (dsl_sync_task(name, dsl_dataset_promote_check, 2891 dsl_dataset_promote_sync, &ddpa, 2892 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2893} 2894 2895int 2896dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2897 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2898{ 2899 int64_t unused_refres_delta; 2900 2901 /* they should both be heads */ 2902 if (clone->ds_is_snapshot || 2903 origin_head->ds_is_snapshot) 2904 return (SET_ERROR(EINVAL)); 2905 2906 /* if we are not forcing, the branch point should be just before them */ 2907 if (!force && clone->ds_prev != origin_head->ds_prev) 2908 return (SET_ERROR(EINVAL)); 2909 2910 /* clone should be the clone (unless they are unrelated) */ 2911 if (clone->ds_prev != NULL && 2912 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2913 origin_head->ds_dir != clone->ds_prev->ds_dir) 2914 return (SET_ERROR(EINVAL)); 2915 2916 /* the clone should be a child of the origin */ 2917 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2918 return (SET_ERROR(EINVAL)); 2919 2920 /* origin_head shouldn't be modified unless 'force' */ 2921 if (!force && 2922 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2923 return (SET_ERROR(ETXTBSY)); 2924 2925 /* origin_head should have no long holds (e.g. is not mounted) */ 2926 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2927 return (SET_ERROR(EBUSY)); 2928 2929 /* check amount of any unconsumed refreservation */ 2930 unused_refres_delta = 2931 (int64_t)MIN(origin_head->ds_reserved, 2932 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2933 (int64_t)MIN(origin_head->ds_reserved, 2934 dsl_dataset_phys(clone)->ds_unique_bytes); 2935 2936 if (unused_refres_delta > 0 && 2937 unused_refres_delta > 2938 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2939 return (SET_ERROR(ENOSPC)); 2940 2941 /* clone can't be over the head's refquota */ 2942 if (origin_head->ds_quota != 0 && 2943 dsl_dataset_phys(clone)->ds_referenced_bytes > 2944 origin_head->ds_quota) 2945 return (SET_ERROR(EDQUOT)); 2946 2947 return (0); 2948} 2949 2950void 2951dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2952 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2953{ 2954 dsl_pool_t *dp = dmu_tx_pool(tx); 2955 int64_t unused_refres_delta; 2956 2957 ASSERT(clone->ds_reserved == 0); 2958 ASSERT(origin_head->ds_quota == 0 || 2959 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); 2960 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2961 2962 /* 2963 * Swap per-dataset feature flags. 2964 */ 2965 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2966 if (!(spa_feature_table[f].fi_flags & 2967 ZFEATURE_FLAG_PER_DATASET)) { 2968 ASSERT(!clone->ds_feature_inuse[f]); 2969 ASSERT(!origin_head->ds_feature_inuse[f]); 2970 continue; 2971 } 2972 2973 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 2974 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 2975 2976 if (clone_inuse) { 2977 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 2978 clone->ds_feature_inuse[f] = B_FALSE; 2979 } 2980 if (origin_head_inuse) { 2981 dsl_dataset_deactivate_feature(origin_head->ds_object, 2982 f, tx); 2983 origin_head->ds_feature_inuse[f] = B_FALSE; 2984 } 2985 if (clone_inuse) { 2986 dsl_dataset_activate_feature(origin_head->ds_object, 2987 f, tx); 2988 origin_head->ds_feature_inuse[f] = B_TRUE; 2989 } 2990 if (origin_head_inuse) { 2991 dsl_dataset_activate_feature(clone->ds_object, f, tx); 2992 clone->ds_feature_inuse[f] = B_TRUE; 2993 } 2994 } 2995 2996 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2997 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2998 2999 if (clone->ds_objset != NULL) { 3000 dmu_objset_evict(clone->ds_objset); 3001 clone->ds_objset = NULL; 3002 } 3003 3004 if (origin_head->ds_objset != NULL) { 3005 dmu_objset_evict(origin_head->ds_objset); 3006 origin_head->ds_objset = NULL; 3007 } 3008 3009 unused_refres_delta = 3010 (int64_t)MIN(origin_head->ds_reserved, 3011 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3012 (int64_t)MIN(origin_head->ds_reserved, 3013 dsl_dataset_phys(clone)->ds_unique_bytes); 3014 3015 /* 3016 * Reset origin's unique bytes, if it exists. 3017 */ 3018 if (clone->ds_prev) { 3019 dsl_dataset_t *origin = clone->ds_prev; 3020 uint64_t comp, uncomp; 3021 3022 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3023 dsl_deadlist_space_range(&clone->ds_deadlist, 3024 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3025 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3026 } 3027 3028 /* swap blkptrs */ 3029 { 3030 blkptr_t tmp; 3031 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3032 dsl_dataset_phys(origin_head)->ds_bp = 3033 dsl_dataset_phys(clone)->ds_bp; 3034 dsl_dataset_phys(clone)->ds_bp = tmp; 3035 } 3036 3037 /* set dd_*_bytes */ 3038 { 3039 int64_t dused, dcomp, duncomp; 3040 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3041 uint64_t odl_used, odl_comp, odl_uncomp; 3042 3043 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3044 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3045 3046 dsl_deadlist_space(&clone->ds_deadlist, 3047 &cdl_used, &cdl_comp, &cdl_uncomp); 3048 dsl_deadlist_space(&origin_head->ds_deadlist, 3049 &odl_used, &odl_comp, &odl_uncomp); 3050 3051 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3052 cdl_used - 3053 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3054 odl_used); 3055 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3056 cdl_comp - 3057 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3058 odl_comp); 3059 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3060 cdl_uncomp - 3061 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3062 odl_uncomp); 3063 3064 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3065 dused, dcomp, duncomp, tx); 3066 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3067 -dused, -dcomp, -duncomp, tx); 3068 3069 /* 3070 * The difference in the space used by snapshots is the 3071 * difference in snapshot space due to the head's 3072 * deadlist (since that's the only thing that's 3073 * changing that affects the snapused). 3074 */ 3075 dsl_deadlist_space_range(&clone->ds_deadlist, 3076 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3077 &cdl_used, &cdl_comp, &cdl_uncomp); 3078 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3079 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3080 &odl_used, &odl_comp, &odl_uncomp); 3081 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3082 DD_USED_HEAD, DD_USED_SNAP, NULL); 3083 } 3084 3085 /* swap ds_*_bytes */ 3086 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3087 dsl_dataset_phys(clone)->ds_referenced_bytes); 3088 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3089 dsl_dataset_phys(clone)->ds_compressed_bytes); 3090 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3091 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3092 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3093 dsl_dataset_phys(clone)->ds_unique_bytes); 3094 3095 /* apply any parent delta for change in unconsumed refreservation */ 3096 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3097 unused_refres_delta, 0, 0, tx); 3098 3099 /* 3100 * Swap deadlists. 3101 */ 3102 dsl_deadlist_close(&clone->ds_deadlist); 3103 dsl_deadlist_close(&origin_head->ds_deadlist); 3104 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3105 dsl_dataset_phys(clone)->ds_deadlist_obj); 3106 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3107 dsl_dataset_phys(clone)->ds_deadlist_obj); 3108 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3109 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3110 3111 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3112 3113 spa_history_log_internal_ds(clone, "clone swap", tx, 3114 "parent=%s", origin_head->ds_dir->dd_myname); 3115} 3116 3117/* 3118 * Given a pool name and a dataset object number in that pool, 3119 * return the name of that dataset. 3120 */ 3121int 3122dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3123{ 3124 dsl_pool_t *dp; 3125 dsl_dataset_t *ds; 3126 int error; 3127 3128 error = dsl_pool_hold(pname, FTAG, &dp); 3129 if (error != 0) 3130 return (error); 3131 3132 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3133 if (error == 0) { 3134 dsl_dataset_name(ds, buf); 3135 dsl_dataset_rele(ds, FTAG); 3136 } 3137 dsl_pool_rele(dp, FTAG); 3138 3139 return (error); 3140} 3141 3142int 3143dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3144 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3145{ 3146 int error = 0; 3147 3148 ASSERT3S(asize, >, 0); 3149 3150 /* 3151 * *ref_rsrv is the portion of asize that will come from any 3152 * unconsumed refreservation space. 3153 */ 3154 *ref_rsrv = 0; 3155 3156 mutex_enter(&ds->ds_lock); 3157 /* 3158 * Make a space adjustment for reserved bytes. 3159 */ 3160 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3161 ASSERT3U(*used, >=, 3162 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3163 *used -= 3164 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3165 *ref_rsrv = 3166 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3167 } 3168 3169 if (!check_quota || ds->ds_quota == 0) { 3170 mutex_exit(&ds->ds_lock); 3171 return (0); 3172 } 3173 /* 3174 * If they are requesting more space, and our current estimate 3175 * is over quota, they get to try again unless the actual 3176 * on-disk is over quota and there are no pending changes (which 3177 * may free up space for us). 3178 */ 3179 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3180 ds->ds_quota) { 3181 if (inflight > 0 || 3182 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3183 error = SET_ERROR(ERESTART); 3184 else 3185 error = SET_ERROR(EDQUOT); 3186 } 3187 mutex_exit(&ds->ds_lock); 3188 3189 return (error); 3190} 3191 3192typedef struct dsl_dataset_set_qr_arg { 3193 const char *ddsqra_name; 3194 zprop_source_t ddsqra_source; 3195 uint64_t ddsqra_value; 3196} dsl_dataset_set_qr_arg_t; 3197 3198 3199/* ARGSUSED */ 3200static int 3201dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3202{ 3203 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3204 dsl_pool_t *dp = dmu_tx_pool(tx); 3205 dsl_dataset_t *ds; 3206 int error; 3207 uint64_t newval; 3208 3209 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3210 return (SET_ERROR(ENOTSUP)); 3211 3212 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3213 if (error != 0) 3214 return (error); 3215 3216 if (ds->ds_is_snapshot) { 3217 dsl_dataset_rele(ds, FTAG); 3218 return (SET_ERROR(EINVAL)); 3219 } 3220 3221 error = dsl_prop_predict(ds->ds_dir, 3222 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3223 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3224 if (error != 0) { 3225 dsl_dataset_rele(ds, FTAG); 3226 return (error); 3227 } 3228 3229 if (newval == 0) { 3230 dsl_dataset_rele(ds, FTAG); 3231 return (0); 3232 } 3233 3234 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3235 newval < ds->ds_reserved) { 3236 dsl_dataset_rele(ds, FTAG); 3237 return (SET_ERROR(ENOSPC)); 3238 } 3239 3240 dsl_dataset_rele(ds, FTAG); 3241 return (0); 3242} 3243 3244static void 3245dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3246{ 3247 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3248 dsl_pool_t *dp = dmu_tx_pool(tx); 3249 dsl_dataset_t *ds; 3250 uint64_t newval; 3251 3252 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3253 3254 dsl_prop_set_sync_impl(ds, 3255 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3256 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3257 &ddsqra->ddsqra_value, tx); 3258 3259 VERIFY0(dsl_prop_get_int_ds(ds, 3260 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3261 3262 if (ds->ds_quota != newval) { 3263 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3264 ds->ds_quota = newval; 3265 } 3266 dsl_dataset_rele(ds, FTAG); 3267} 3268 3269int 3270dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3271 uint64_t refquota) 3272{ 3273 dsl_dataset_set_qr_arg_t ddsqra; 3274 3275 ddsqra.ddsqra_name = dsname; 3276 ddsqra.ddsqra_source = source; 3277 ddsqra.ddsqra_value = refquota; 3278 3279 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3280 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3281} 3282 3283static int 3284dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3285{ 3286 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3287 dsl_pool_t *dp = dmu_tx_pool(tx); 3288 dsl_dataset_t *ds; 3289 int error; 3290 uint64_t newval, unique; 3291 3292 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3293 return (SET_ERROR(ENOTSUP)); 3294 3295 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3296 if (error != 0) 3297 return (error); 3298 3299 if (ds->ds_is_snapshot) { 3300 dsl_dataset_rele(ds, FTAG); 3301 return (SET_ERROR(EINVAL)); 3302 } 3303 3304 error = dsl_prop_predict(ds->ds_dir, 3305 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3306 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3307 if (error != 0) { 3308 dsl_dataset_rele(ds, FTAG); 3309 return (error); 3310 } 3311 3312 /* 3313 * If we are doing the preliminary check in open context, the 3314 * space estimates may be inaccurate. 3315 */ 3316 if (!dmu_tx_is_syncing(tx)) { 3317 dsl_dataset_rele(ds, FTAG); 3318 return (0); 3319 } 3320 3321 mutex_enter(&ds->ds_lock); 3322 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3323 dsl_dataset_recalc_head_uniq(ds); 3324 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3325 mutex_exit(&ds->ds_lock); 3326 3327 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3328 uint64_t delta = MAX(unique, newval) - 3329 MAX(unique, ds->ds_reserved); 3330 3331 if (delta > 3332 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3333 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3334 dsl_dataset_rele(ds, FTAG); 3335 return (SET_ERROR(ENOSPC)); 3336 } 3337 } 3338 3339 dsl_dataset_rele(ds, FTAG); 3340 return (0); 3341} 3342 3343void 3344dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3345 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3346{ 3347 uint64_t newval; 3348 uint64_t unique; 3349 int64_t delta; 3350 3351 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3352 source, sizeof (value), 1, &value, tx); 3353 3354 VERIFY0(dsl_prop_get_int_ds(ds, 3355 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3356 3357 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3358 mutex_enter(&ds->ds_dir->dd_lock); 3359 mutex_enter(&ds->ds_lock); 3360 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3361 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3362 delta = MAX(0, (int64_t)(newval - unique)) - 3363 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3364 ds->ds_reserved = newval; 3365 mutex_exit(&ds->ds_lock); 3366 3367 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3368 mutex_exit(&ds->ds_dir->dd_lock); 3369} 3370 3371static void 3372dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3373{ 3374 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3375 dsl_pool_t *dp = dmu_tx_pool(tx); 3376 dsl_dataset_t *ds; 3377 3378 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3379 dsl_dataset_set_refreservation_sync_impl(ds, 3380 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3381 dsl_dataset_rele(ds, FTAG); 3382} 3383 3384int 3385dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3386 uint64_t refreservation) 3387{ 3388 dsl_dataset_set_qr_arg_t ddsqra; 3389 3390 ddsqra.ddsqra_name = dsname; 3391 ddsqra.ddsqra_source = source; 3392 ddsqra.ddsqra_value = refreservation; 3393 3394 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3395 dsl_dataset_set_refreservation_sync, &ddsqra, 3396 0, ZFS_SPACE_CHECK_NONE)); 3397} 3398 3399/* 3400 * Return (in *usedp) the amount of space written in new that is not 3401 * present in oldsnap. New may be a snapshot or the head. Old must be 3402 * a snapshot before new, in new's filesystem (or its origin). If not then 3403 * fail and return EINVAL. 3404 * 3405 * The written space is calculated by considering two components: First, we 3406 * ignore any freed space, and calculate the written as new's used space 3407 * minus old's used space. Next, we add in the amount of space that was freed 3408 * between the two snapshots, thus reducing new's used space relative to old's. 3409 * Specifically, this is the space that was born before old->ds_creation_txg, 3410 * and freed before new (ie. on new's deadlist or a previous deadlist). 3411 * 3412 * space freed [---------------------] 3413 * snapshots ---O-------O--------O-------O------ 3414 * oldsnap new 3415 */ 3416int 3417dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3418 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3419{ 3420 int err = 0; 3421 uint64_t snapobj; 3422 dsl_pool_t *dp = new->ds_dir->dd_pool; 3423 3424 ASSERT(dsl_pool_config_held(dp)); 3425 3426 *usedp = 0; 3427 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3428 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3429 3430 *compp = 0; 3431 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3432 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3433 3434 *uncompp = 0; 3435 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3436 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3437 3438 snapobj = new->ds_object; 3439 while (snapobj != oldsnap->ds_object) { 3440 dsl_dataset_t *snap; 3441 uint64_t used, comp, uncomp; 3442 3443 if (snapobj == new->ds_object) { 3444 snap = new; 3445 } else { 3446 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3447 if (err != 0) 3448 break; 3449 } 3450 3451 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3452 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3453 /* 3454 * The blocks in the deadlist can not be born after 3455 * ds_prev_snap_txg, so get the whole deadlist space, 3456 * which is more efficient (especially for old-format 3457 * deadlists). Unfortunately the deadlist code 3458 * doesn't have enough information to make this 3459 * optimization itself. 3460 */ 3461 dsl_deadlist_space(&snap->ds_deadlist, 3462 &used, &comp, &uncomp); 3463 } else { 3464 dsl_deadlist_space_range(&snap->ds_deadlist, 3465 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3466 &used, &comp, &uncomp); 3467 } 3468 *usedp += used; 3469 *compp += comp; 3470 *uncompp += uncomp; 3471 3472 /* 3473 * If we get to the beginning of the chain of snapshots 3474 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3475 * was not a snapshot of/before new. 3476 */ 3477 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3478 if (snap != new) 3479 dsl_dataset_rele(snap, FTAG); 3480 if (snapobj == 0) { 3481 err = SET_ERROR(EINVAL); 3482 break; 3483 } 3484 3485 } 3486 return (err); 3487} 3488 3489/* 3490 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3491 * lastsnap, and all snapshots in between are deleted. 3492 * 3493 * blocks that would be freed [---------------------------] 3494 * snapshots ---O-------O--------O-------O--------O 3495 * firstsnap lastsnap 3496 * 3497 * This is the set of blocks that were born after the snap before firstsnap, 3498 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3499 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3500 * We calculate this by iterating over the relevant deadlists (from the snap 3501 * after lastsnap, backward to the snap after firstsnap), summing up the 3502 * space on the deadlist that was born after the snap before firstsnap. 3503 */ 3504int 3505dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3506 dsl_dataset_t *lastsnap, 3507 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3508{ 3509 int err = 0; 3510 uint64_t snapobj; 3511 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3512 3513 ASSERT(firstsnap->ds_is_snapshot); 3514 ASSERT(lastsnap->ds_is_snapshot); 3515 3516 /* 3517 * Check that the snapshots are in the same dsl_dir, and firstsnap 3518 * is before lastsnap. 3519 */ 3520 if (firstsnap->ds_dir != lastsnap->ds_dir || 3521 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3522 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3523 return (SET_ERROR(EINVAL)); 3524 3525 *usedp = *compp = *uncompp = 0; 3526 3527 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3528 while (snapobj != firstsnap->ds_object) { 3529 dsl_dataset_t *ds; 3530 uint64_t used, comp, uncomp; 3531 3532 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3533 if (err != 0) 3534 break; 3535 3536 dsl_deadlist_space_range(&ds->ds_deadlist, 3537 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3538 &used, &comp, &uncomp); 3539 *usedp += used; 3540 *compp += comp; 3541 *uncompp += uncomp; 3542 3543 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3544 ASSERT3U(snapobj, !=, 0); 3545 dsl_dataset_rele(ds, FTAG); 3546 } 3547 return (err); 3548} 3549 3550/* 3551 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3552 * For example, they could both be snapshots of the same filesystem, and 3553 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3554 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3555 * filesystem. Or 'earlier' could be the origin's origin. 3556 * 3557 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3558 */ 3559boolean_t 3560dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3561 uint64_t earlier_txg) 3562{ 3563 dsl_pool_t *dp = later->ds_dir->dd_pool; 3564 int error; 3565 boolean_t ret; 3566 3567 ASSERT(dsl_pool_config_held(dp)); 3568 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3569 3570 if (earlier_txg == 0) 3571 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3572 3573 if (later->ds_is_snapshot && 3574 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3575 return (B_FALSE); 3576 3577 if (later->ds_dir == earlier->ds_dir) 3578 return (B_TRUE); 3579 if (!dsl_dir_is_clone(later->ds_dir)) 3580 return (B_FALSE); 3581 3582 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3583 return (B_TRUE); 3584 dsl_dataset_t *origin; 3585 error = dsl_dataset_hold_obj(dp, 3586 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3587 if (error != 0) 3588 return (B_FALSE); 3589 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3590 dsl_dataset_rele(origin, FTAG); 3591 return (ret); 3592} 3593 3594void 3595dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3596{ 3597 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3598 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3599} 3600 3601boolean_t 3602dsl_dataset_is_zapified(dsl_dataset_t *ds) 3603{ 3604 dmu_object_info_t doi; 3605 3606 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3607 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3608} 3609 3610boolean_t 3611dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3612{ 3613 return (dsl_dataset_is_zapified(ds) && 3614 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3615 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3616} 3617