dsl_dataset.c revision 290756
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/zio_compress.h> 56#include <zfs_fletcher.h> 57 58SYSCTL_DECL(_vfs_zfs); 59 60/* 61 * The SPA supports block sizes up to 16MB. However, very large blocks 62 * can have an impact on i/o latency (e.g. tying up a spinning disk for 63 * ~300ms), and also potentially on the memory allocator. Therefore, 64 * we do not allow the recordsize to be set larger than zfs_max_recordsize 65 * (default 1MB). Larger blocks can be created by changing this tunable, 66 * and pools with larger blocks can always be imported and used, regardless 67 * of this setting. 68 */ 69int zfs_max_recordsize = 1 * 1024 * 1024; 70SYSCTL_INT(_vfs_zfs, OID_AUTO, max_recordsize, CTLFLAG_RWTUN, 71 &zfs_max_recordsize, 0, 72 "Maximum block size. Expect dragons when tuning this."); 73 74#define SWITCH64(x, y) \ 75 { \ 76 uint64_t __tmp = (x); \ 77 (x) = (y); \ 78 (y) = __tmp; \ 79 } 80 81#define DS_REF_MAX (1ULL << 62) 82 83extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 84 85/* 86 * Figure out how much of this delta should be propogated to the dsl_dir 87 * layer. If there's a refreservation, that space has already been 88 * partially accounted for in our ancestors. 89 */ 90static int64_t 91parent_delta(dsl_dataset_t *ds, int64_t delta) 92{ 93 dsl_dataset_phys_t *ds_phys; 94 uint64_t old_bytes, new_bytes; 95 96 if (ds->ds_reserved == 0) 97 return (delta); 98 99 ds_phys = dsl_dataset_phys(ds); 100 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 101 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 102 103 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 104 return (new_bytes - old_bytes); 105} 106 107void 108dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 109{ 110 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 111 int compressed = BP_GET_PSIZE(bp); 112 int uncompressed = BP_GET_UCSIZE(bp); 113 int64_t delta; 114 115 dprintf_bp(bp, "ds=%p", ds); 116 117 ASSERT(dmu_tx_is_syncing(tx)); 118 /* It could have been compressed away to nothing */ 119 if (BP_IS_HOLE(bp)) 120 return; 121 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 122 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 123 if (ds == NULL) { 124 dsl_pool_mos_diduse_space(tx->tx_pool, 125 used, compressed, uncompressed); 126 return; 127 } 128 129 dmu_buf_will_dirty(ds->ds_dbuf, tx); 130 mutex_enter(&ds->ds_lock); 131 delta = parent_delta(ds, used); 132 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 133 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 134 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 135 dsl_dataset_phys(ds)->ds_unique_bytes += used; 136 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 137 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 138 B_TRUE; 139 } 140 mutex_exit(&ds->ds_lock); 141 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 142 compressed, uncompressed, tx); 143 dsl_dir_transfer_space(ds->ds_dir, used - delta, 144 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 145} 146 147int 148dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 149 boolean_t async) 150{ 151 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 152 int compressed = BP_GET_PSIZE(bp); 153 int uncompressed = BP_GET_UCSIZE(bp); 154 155 if (BP_IS_HOLE(bp)) 156 return (0); 157 158 ASSERT(dmu_tx_is_syncing(tx)); 159 ASSERT(bp->blk_birth <= tx->tx_txg); 160 161 if (ds == NULL) { 162 dsl_free(tx->tx_pool, tx->tx_txg, bp); 163 dsl_pool_mos_diduse_space(tx->tx_pool, 164 -used, -compressed, -uncompressed); 165 return (used); 166 } 167 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 168 169 ASSERT(!ds->ds_is_snapshot); 170 dmu_buf_will_dirty(ds->ds_dbuf, tx); 171 172 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 173 int64_t delta; 174 175 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 176 dsl_free(tx->tx_pool, tx->tx_txg, bp); 177 178 mutex_enter(&ds->ds_lock); 179 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 180 !DS_UNIQUE_IS_ACCURATE(ds)); 181 delta = parent_delta(ds, -used); 182 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 183 mutex_exit(&ds->ds_lock); 184 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 185 delta, -compressed, -uncompressed, tx); 186 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 187 DD_USED_REFRSRV, DD_USED_HEAD, NULL); 188 } else { 189 dprintf_bp(bp, "putting on dead list: %s", ""); 190 if (async) { 191 /* 192 * We are here as part of zio's write done callback, 193 * which means we're a zio interrupt thread. We can't 194 * call dsl_deadlist_insert() now because it may block 195 * waiting for I/O. Instead, put bp on the deferred 196 * queue and let dsl_pool_sync() finish the job. 197 */ 198 bplist_append(&ds->ds_pending_deadlist, bp); 199 } else { 200 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 201 } 202 ASSERT3U(ds->ds_prev->ds_object, ==, 203 dsl_dataset_phys(ds)->ds_prev_snap_obj); 204 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 205 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 206 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 207 ds->ds_object && bp->blk_birth > 208 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 209 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 210 mutex_enter(&ds->ds_prev->ds_lock); 211 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 212 mutex_exit(&ds->ds_prev->ds_lock); 213 } 214 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 215 dsl_dir_transfer_space(ds->ds_dir, used, 216 DD_USED_HEAD, DD_USED_SNAP, tx); 217 } 218 } 219 mutex_enter(&ds->ds_lock); 220 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 221 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 222 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 223 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 224 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 225 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 226 mutex_exit(&ds->ds_lock); 227 228 return (used); 229} 230 231uint64_t 232dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 233{ 234 uint64_t trysnap = 0; 235 236 if (ds == NULL) 237 return (0); 238 /* 239 * The snapshot creation could fail, but that would cause an 240 * incorrect FALSE return, which would only result in an 241 * overestimation of the amount of space that an operation would 242 * consume, which is OK. 243 * 244 * There's also a small window where we could miss a pending 245 * snapshot, because we could set the sync task in the quiescing 246 * phase. So this should only be used as a guess. 247 */ 248 if (ds->ds_trysnap_txg > 249 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 250 trysnap = ds->ds_trysnap_txg; 251 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 252} 253 254boolean_t 255dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 256 uint64_t blk_birth) 257{ 258 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 259 (bp != NULL && BP_IS_HOLE(bp))) 260 return (B_FALSE); 261 262 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 263 264 return (B_TRUE); 265} 266 267static void 268dsl_dataset_evict(void *dbu) 269{ 270 dsl_dataset_t *ds = dbu; 271 272 ASSERT(ds->ds_owner == NULL); 273 274 ds->ds_dbuf = NULL; 275 276 unique_remove(ds->ds_fsid_guid); 277 278 if (ds->ds_objset != NULL) 279 dmu_objset_evict(ds->ds_objset); 280 281 if (ds->ds_prev) { 282 dsl_dataset_rele(ds->ds_prev, ds); 283 ds->ds_prev = NULL; 284 } 285 286 bplist_destroy(&ds->ds_pending_deadlist); 287 if (ds->ds_deadlist.dl_os != NULL) 288 dsl_deadlist_close(&ds->ds_deadlist); 289 if (ds->ds_dir) 290 dsl_dir_async_rele(ds->ds_dir, ds); 291 292 ASSERT(!list_link_active(&ds->ds_synced_link)); 293 294 list_destroy(&ds->ds_prop_cbs); 295 if (mutex_owned(&ds->ds_lock)) 296 mutex_exit(&ds->ds_lock); 297 mutex_destroy(&ds->ds_lock); 298 if (mutex_owned(&ds->ds_opening_lock)) 299 mutex_exit(&ds->ds_opening_lock); 300 mutex_destroy(&ds->ds_opening_lock); 301 mutex_destroy(&ds->ds_sendstream_lock); 302 refcount_destroy(&ds->ds_longholds); 303 304 kmem_free(ds, sizeof (dsl_dataset_t)); 305} 306 307int 308dsl_dataset_get_snapname(dsl_dataset_t *ds) 309{ 310 dsl_dataset_phys_t *headphys; 311 int err; 312 dmu_buf_t *headdbuf; 313 dsl_pool_t *dp = ds->ds_dir->dd_pool; 314 objset_t *mos = dp->dp_meta_objset; 315 316 if (ds->ds_snapname[0]) 317 return (0); 318 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 319 return (0); 320 321 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 322 FTAG, &headdbuf); 323 if (err != 0) 324 return (err); 325 headphys = headdbuf->db_data; 326 err = zap_value_search(dp->dp_meta_objset, 327 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 328 dmu_buf_rele(headdbuf, FTAG); 329 return (err); 330} 331 332int 333dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 334{ 335 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 336 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 337 matchtype_t mt; 338 int err; 339 340 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 341 mt = MT_FIRST; 342 else 343 mt = MT_EXACT; 344 345 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 346 value, mt, NULL, 0, NULL); 347 if (err == ENOTSUP && mt == MT_FIRST) 348 err = zap_lookup(mos, snapobj, name, 8, 1, value); 349 return (err); 350} 351 352int 353dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 354 boolean_t adj_cnt) 355{ 356 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 357 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 358 matchtype_t mt; 359 int err; 360 361 dsl_dir_snap_cmtime_update(ds->ds_dir); 362 363 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 364 mt = MT_FIRST; 365 else 366 mt = MT_EXACT; 367 368 err = zap_remove_norm(mos, snapobj, name, mt, tx); 369 if (err == ENOTSUP && mt == MT_FIRST) 370 err = zap_remove(mos, snapobj, name, tx); 371 372 if (err == 0 && adj_cnt) 373 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 374 DD_FIELD_SNAPSHOT_COUNT, tx); 375 376 return (err); 377} 378 379boolean_t 380dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 381{ 382 dmu_buf_t *dbuf = ds->ds_dbuf; 383 boolean_t result = B_FALSE; 384 385 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 386 ds->ds_object, DMU_BONUS_BLKID, tag)) { 387 388 if (ds == dmu_buf_get_user(dbuf)) 389 result = B_TRUE; 390 else 391 dmu_buf_rele(dbuf, tag); 392 } 393 394 return (result); 395} 396 397int 398dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 399 dsl_dataset_t **dsp) 400{ 401 objset_t *mos = dp->dp_meta_objset; 402 dmu_buf_t *dbuf; 403 dsl_dataset_t *ds; 404 int err; 405 dmu_object_info_t doi; 406 407 ASSERT(dsl_pool_config_held(dp)); 408 409 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 410 if (err != 0) 411 return (err); 412 413 /* Make sure dsobj has the correct object type. */ 414 dmu_object_info_from_db(dbuf, &doi); 415 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 416 dmu_buf_rele(dbuf, tag); 417 return (SET_ERROR(EINVAL)); 418 } 419 420 ds = dmu_buf_get_user(dbuf); 421 if (ds == NULL) { 422 dsl_dataset_t *winner = NULL; 423 424 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 425 ds->ds_dbuf = dbuf; 426 ds->ds_object = dsobj; 427 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 428 429 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 430 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 431 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 432 refcount_create(&ds->ds_longholds); 433 434 bplist_create(&ds->ds_pending_deadlist); 435 dsl_deadlist_open(&ds->ds_deadlist, 436 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 437 438 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 439 offsetof(dmu_sendarg_t, dsa_link)); 440 441 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 442 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 443 444 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 445 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 446 if (!(spa_feature_table[f].fi_flags & 447 ZFEATURE_FLAG_PER_DATASET)) 448 continue; 449 err = zap_contains(mos, dsobj, 450 spa_feature_table[f].fi_guid); 451 if (err == 0) { 452 ds->ds_feature_inuse[f] = B_TRUE; 453 } else { 454 ASSERT3U(err, ==, ENOENT); 455 err = 0; 456 } 457 } 458 } 459 460 err = dsl_dir_hold_obj(dp, 461 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 462 if (err != 0) { 463 mutex_destroy(&ds->ds_lock); 464 mutex_destroy(&ds->ds_opening_lock); 465 mutex_destroy(&ds->ds_sendstream_lock); 466 refcount_destroy(&ds->ds_longholds); 467 bplist_destroy(&ds->ds_pending_deadlist); 468 dsl_deadlist_close(&ds->ds_deadlist); 469 kmem_free(ds, sizeof (dsl_dataset_t)); 470 dmu_buf_rele(dbuf, tag); 471 return (err); 472 } 473 474 if (!ds->ds_is_snapshot) { 475 ds->ds_snapname[0] = '\0'; 476 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 477 err = dsl_dataset_hold_obj(dp, 478 dsl_dataset_phys(ds)->ds_prev_snap_obj, 479 ds, &ds->ds_prev); 480 } 481 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 482 int zaperr = zap_lookup(mos, ds->ds_object, 483 DS_FIELD_BOOKMARK_NAMES, 484 sizeof (ds->ds_bookmarks), 1, 485 &ds->ds_bookmarks); 486 if (zaperr != ENOENT) 487 VERIFY0(zaperr); 488 } 489 } else { 490 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 491 err = dsl_dataset_get_snapname(ds); 492 if (err == 0 && 493 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 494 err = zap_count( 495 ds->ds_dir->dd_pool->dp_meta_objset, 496 dsl_dataset_phys(ds)->ds_userrefs_obj, 497 &ds->ds_userrefs); 498 } 499 } 500 501 if (err == 0 && !ds->ds_is_snapshot) { 502 err = dsl_prop_get_int_ds(ds, 503 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 504 &ds->ds_reserved); 505 if (err == 0) { 506 err = dsl_prop_get_int_ds(ds, 507 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 508 &ds->ds_quota); 509 } 510 } else { 511 ds->ds_reserved = ds->ds_quota = 0; 512 } 513 514 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 515 if (err == 0) 516 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 517 518 if (err != 0 || winner != NULL) { 519 bplist_destroy(&ds->ds_pending_deadlist); 520 dsl_deadlist_close(&ds->ds_deadlist); 521 if (ds->ds_prev) 522 dsl_dataset_rele(ds->ds_prev, ds); 523 dsl_dir_rele(ds->ds_dir, ds); 524 mutex_destroy(&ds->ds_lock); 525 mutex_destroy(&ds->ds_opening_lock); 526 mutex_destroy(&ds->ds_sendstream_lock); 527 refcount_destroy(&ds->ds_longholds); 528 kmem_free(ds, sizeof (dsl_dataset_t)); 529 if (err != 0) { 530 dmu_buf_rele(dbuf, tag); 531 return (err); 532 } 533 ds = winner; 534 } else { 535 ds->ds_fsid_guid = 536 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 537 } 538 } 539 ASSERT3P(ds->ds_dbuf, ==, dbuf); 540 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 541 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 542 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 543 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 544 *dsp = ds; 545 return (0); 546} 547 548int 549dsl_dataset_hold(dsl_pool_t *dp, const char *name, 550 void *tag, dsl_dataset_t **dsp) 551{ 552 dsl_dir_t *dd; 553 const char *snapname; 554 uint64_t obj; 555 int err = 0; 556 dsl_dataset_t *ds; 557 558 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 559 if (err != 0) 560 return (err); 561 562 ASSERT(dsl_pool_config_held(dp)); 563 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 564 if (obj != 0) 565 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 566 else 567 err = SET_ERROR(ENOENT); 568 569 /* we may be looking for a snapshot */ 570 if (err == 0 && snapname != NULL) { 571 dsl_dataset_t *snap_ds; 572 573 if (*snapname++ != '@') { 574 dsl_dataset_rele(ds, tag); 575 dsl_dir_rele(dd, FTAG); 576 return (SET_ERROR(ENOENT)); 577 } 578 579 dprintf("looking for snapshot '%s'\n", snapname); 580 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 581 if (err == 0) 582 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 583 dsl_dataset_rele(ds, tag); 584 585 if (err == 0) { 586 mutex_enter(&snap_ds->ds_lock); 587 if (snap_ds->ds_snapname[0] == 0) 588 (void) strlcpy(snap_ds->ds_snapname, snapname, 589 sizeof (snap_ds->ds_snapname)); 590 mutex_exit(&snap_ds->ds_lock); 591 ds = snap_ds; 592 } 593 } 594 if (err == 0) 595 *dsp = ds; 596 dsl_dir_rele(dd, FTAG); 597 return (err); 598} 599 600int 601dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 602 void *tag, dsl_dataset_t **dsp) 603{ 604 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 605 if (err != 0) 606 return (err); 607 if (!dsl_dataset_tryown(*dsp, tag)) { 608 dsl_dataset_rele(*dsp, tag); 609 *dsp = NULL; 610 return (SET_ERROR(EBUSY)); 611 } 612 return (0); 613} 614 615int 616dsl_dataset_own(dsl_pool_t *dp, const char *name, 617 void *tag, dsl_dataset_t **dsp) 618{ 619 int err = dsl_dataset_hold(dp, name, tag, dsp); 620 if (err != 0) 621 return (err); 622 if (!dsl_dataset_tryown(*dsp, tag)) { 623 dsl_dataset_rele(*dsp, tag); 624 return (SET_ERROR(EBUSY)); 625 } 626 return (0); 627} 628 629/* 630 * See the comment above dsl_pool_hold() for details. In summary, a long 631 * hold is used to prevent destruction of a dataset while the pool hold 632 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 633 * 634 * The dataset and pool must be held when this function is called. After it 635 * is called, the pool hold may be released while the dataset is still held 636 * and accessed. 637 */ 638void 639dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 640{ 641 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 642 (void) refcount_add(&ds->ds_longholds, tag); 643} 644 645void 646dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 647{ 648 (void) refcount_remove(&ds->ds_longholds, tag); 649} 650 651/* Return B_TRUE if there are any long holds on this dataset. */ 652boolean_t 653dsl_dataset_long_held(dsl_dataset_t *ds) 654{ 655 return (!refcount_is_zero(&ds->ds_longholds)); 656} 657 658void 659dsl_dataset_name(dsl_dataset_t *ds, char *name) 660{ 661 if (ds == NULL) { 662 (void) strcpy(name, "mos"); 663 } else { 664 dsl_dir_name(ds->ds_dir, name); 665 VERIFY0(dsl_dataset_get_snapname(ds)); 666 if (ds->ds_snapname[0]) { 667 (void) strcat(name, "@"); 668 /* 669 * We use a "recursive" mutex so that we 670 * can call dprintf_ds() with ds_lock held. 671 */ 672 if (!MUTEX_HELD(&ds->ds_lock)) { 673 mutex_enter(&ds->ds_lock); 674 (void) strcat(name, ds->ds_snapname); 675 mutex_exit(&ds->ds_lock); 676 } else { 677 (void) strcat(name, ds->ds_snapname); 678 } 679 } 680 } 681} 682 683void 684dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 685{ 686 dmu_buf_rele(ds->ds_dbuf, tag); 687} 688 689void 690dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 691{ 692 ASSERT3P(ds->ds_owner, ==, tag); 693 ASSERT(ds->ds_dbuf != NULL); 694 695 mutex_enter(&ds->ds_lock); 696 ds->ds_owner = NULL; 697 mutex_exit(&ds->ds_lock); 698 dsl_dataset_long_rele(ds, tag); 699 dsl_dataset_rele(ds, tag); 700} 701 702boolean_t 703dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 704{ 705 boolean_t gotit = FALSE; 706 707 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 708 mutex_enter(&ds->ds_lock); 709 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 710 ds->ds_owner = tag; 711 dsl_dataset_long_hold(ds, tag); 712 gotit = TRUE; 713 } 714 mutex_exit(&ds->ds_lock); 715 return (gotit); 716} 717 718boolean_t 719dsl_dataset_has_owner(dsl_dataset_t *ds) 720{ 721 boolean_t rv; 722 mutex_enter(&ds->ds_lock); 723 rv = (ds->ds_owner != NULL); 724 mutex_exit(&ds->ds_lock); 725 return (rv); 726} 727 728static void 729dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 730{ 731 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 732 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 733 uint64_t zero = 0; 734 735 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 736 737 spa_feature_incr(spa, f, tx); 738 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 739 740 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 741 sizeof (zero), 1, &zero, tx)); 742} 743 744void 745dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 746{ 747 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 748 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 749 750 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 751 752 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 753 spa_feature_decr(spa, f, tx); 754} 755 756uint64_t 757dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 758 uint64_t flags, dmu_tx_t *tx) 759{ 760 dsl_pool_t *dp = dd->dd_pool; 761 dmu_buf_t *dbuf; 762 dsl_dataset_phys_t *dsphys; 763 uint64_t dsobj; 764 objset_t *mos = dp->dp_meta_objset; 765 766 if (origin == NULL) 767 origin = dp->dp_origin_snap; 768 769 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 770 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 771 ASSERT(dmu_tx_is_syncing(tx)); 772 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 773 774 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 775 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 776 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 777 dmu_buf_will_dirty(dbuf, tx); 778 dsphys = dbuf->db_data; 779 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 780 dsphys->ds_dir_obj = dd->dd_object; 781 dsphys->ds_flags = flags; 782 dsphys->ds_fsid_guid = unique_create(); 783 do { 784 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 785 sizeof (dsphys->ds_guid)); 786 } while (dsphys->ds_guid == 0); 787 dsphys->ds_snapnames_zapobj = 788 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 789 DMU_OT_NONE, 0, tx); 790 dsphys->ds_creation_time = gethrestime_sec(); 791 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 792 793 if (origin == NULL) { 794 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 795 } else { 796 dsl_dataset_t *ohds; /* head of the origin snapshot */ 797 798 dsphys->ds_prev_snap_obj = origin->ds_object; 799 dsphys->ds_prev_snap_txg = 800 dsl_dataset_phys(origin)->ds_creation_txg; 801 dsphys->ds_referenced_bytes = 802 dsl_dataset_phys(origin)->ds_referenced_bytes; 803 dsphys->ds_compressed_bytes = 804 dsl_dataset_phys(origin)->ds_compressed_bytes; 805 dsphys->ds_uncompressed_bytes = 806 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 807 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 808 809 /* 810 * Inherit flags that describe the dataset's contents 811 * (INCONSISTENT) or properties (Case Insensitive). 812 */ 813 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 814 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 815 816 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 817 if (origin->ds_feature_inuse[f]) 818 dsl_dataset_activate_feature(dsobj, f, tx); 819 } 820 821 dmu_buf_will_dirty(origin->ds_dbuf, tx); 822 dsl_dataset_phys(origin)->ds_num_children++; 823 824 VERIFY0(dsl_dataset_hold_obj(dp, 825 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 826 FTAG, &ohds)); 827 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 828 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 829 dsl_dataset_rele(ohds, FTAG); 830 831 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 832 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 833 dsl_dataset_phys(origin)->ds_next_clones_obj = 834 zap_create(mos, 835 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 836 } 837 VERIFY0(zap_add_int(mos, 838 dsl_dataset_phys(origin)->ds_next_clones_obj, 839 dsobj, tx)); 840 } 841 842 dmu_buf_will_dirty(dd->dd_dbuf, tx); 843 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 844 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 845 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 846 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 847 dsl_dir_phys(origin->ds_dir)->dd_clones = 848 zap_create(mos, 849 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 850 } 851 VERIFY0(zap_add_int(mos, 852 dsl_dir_phys(origin->ds_dir)->dd_clones, 853 dsobj, tx)); 854 } 855 } 856 857 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 858 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 859 860 dmu_buf_rele(dbuf, FTAG); 861 862 dmu_buf_will_dirty(dd->dd_dbuf, tx); 863 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 864 865 return (dsobj); 866} 867 868static void 869dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 870{ 871 objset_t *os; 872 873 VERIFY0(dmu_objset_from_ds(ds, &os)); 874 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 875 dsl_dataset_dirty(ds, tx); 876} 877 878uint64_t 879dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 880 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 881{ 882 dsl_pool_t *dp = pdd->dd_pool; 883 uint64_t dsobj, ddobj; 884 dsl_dir_t *dd; 885 886 ASSERT(dmu_tx_is_syncing(tx)); 887 ASSERT(lastname[0] != '@'); 888 889 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 890 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 891 892 dsobj = dsl_dataset_create_sync_dd(dd, origin, 893 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 894 895 dsl_deleg_set_create_perms(dd, tx, cr); 896 897 /* 898 * Since we're creating a new node we know it's a leaf, so we can 899 * initialize the counts if the limit feature is active. 900 */ 901 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 902 uint64_t cnt = 0; 903 objset_t *os = dd->dd_pool->dp_meta_objset; 904 905 dsl_dir_zapify(dd, tx); 906 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 907 sizeof (cnt), 1, &cnt, tx)); 908 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 909 sizeof (cnt), 1, &cnt, tx)); 910 } 911 912 dsl_dir_rele(dd, FTAG); 913 914 /* 915 * If we are creating a clone, make sure we zero out any stale 916 * data from the origin snapshots zil header. 917 */ 918 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 919 dsl_dataset_t *ds; 920 921 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 922 dsl_dataset_zero_zil(ds, tx); 923 dsl_dataset_rele(ds, FTAG); 924 } 925 926 return (dsobj); 927} 928 929#ifdef __FreeBSD__ 930/* FreeBSD ioctl compat begin */ 931struct destroyarg { 932 nvlist_t *nvl; 933 const char *snapname; 934}; 935 936static int 937dsl_check_snap_cb(const char *name, void *arg) 938{ 939 struct destroyarg *da = arg; 940 dsl_dataset_t *ds; 941 char *dsname; 942 943 dsname = kmem_asprintf("%s@%s", name, da->snapname); 944 fnvlist_add_boolean(da->nvl, dsname); 945 kmem_free(dsname, strlen(dsname) + 1); 946 947 return (0); 948} 949 950int 951dmu_get_recursive_snaps_nvl(char *fsname, const char *snapname, 952 nvlist_t *snaps) 953{ 954 struct destroyarg *da; 955 int err; 956 957 da = kmem_zalloc(sizeof (struct destroyarg), KM_SLEEP); 958 da->nvl = snaps; 959 da->snapname = snapname; 960 err = dmu_objset_find(fsname, dsl_check_snap_cb, da, 961 DS_FIND_CHILDREN); 962 kmem_free(da, sizeof (struct destroyarg)); 963 964 return (err); 965} 966/* FreeBSD ioctl compat end */ 967#endif /* __FreeBSD__ */ 968 969/* 970 * The unique space in the head dataset can be calculated by subtracting 971 * the space used in the most recent snapshot, that is still being used 972 * in this file system, from the space currently in use. To figure out 973 * the space in the most recent snapshot still in use, we need to take 974 * the total space used in the snapshot and subtract out the space that 975 * has been freed up since the snapshot was taken. 976 */ 977void 978dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 979{ 980 uint64_t mrs_used; 981 uint64_t dlused, dlcomp, dluncomp; 982 983 ASSERT(!ds->ds_is_snapshot); 984 985 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 986 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 987 else 988 mrs_used = 0; 989 990 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 991 992 ASSERT3U(dlused, <=, mrs_used); 993 dsl_dataset_phys(ds)->ds_unique_bytes = 994 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 995 996 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 997 SPA_VERSION_UNIQUE_ACCURATE) 998 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 999} 1000 1001void 1002dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 1003 dmu_tx_t *tx) 1004{ 1005 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1006 uint64_t count; 1007 int err; 1008 1009 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 1010 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1011 obj, tx); 1012 /* 1013 * The err should not be ENOENT, but a bug in a previous version 1014 * of the code could cause upgrade_clones_cb() to not set 1015 * ds_next_snap_obj when it should, leading to a missing entry. 1016 * If we knew that the pool was created after 1017 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 1018 * ENOENT. However, at least we can check that we don't have 1019 * too many entries in the next_clones_obj even after failing to 1020 * remove this one. 1021 */ 1022 if (err != ENOENT) 1023 VERIFY0(err); 1024 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1025 &count)); 1026 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1027} 1028 1029 1030blkptr_t * 1031dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1032{ 1033 return (&dsl_dataset_phys(ds)->ds_bp); 1034} 1035 1036void 1037dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1038{ 1039 ASSERT(dmu_tx_is_syncing(tx)); 1040 /* If it's the meta-objset, set dp_meta_rootbp */ 1041 if (ds == NULL) { 1042 tx->tx_pool->dp_meta_rootbp = *bp; 1043 } else { 1044 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1045 dsl_dataset_phys(ds)->ds_bp = *bp; 1046 } 1047} 1048 1049spa_t * 1050dsl_dataset_get_spa(dsl_dataset_t *ds) 1051{ 1052 return (ds->ds_dir->dd_pool->dp_spa); 1053} 1054 1055void 1056dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1057{ 1058 dsl_pool_t *dp; 1059 1060 if (ds == NULL) /* this is the meta-objset */ 1061 return; 1062 1063 ASSERT(ds->ds_objset != NULL); 1064 1065 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1066 panic("dirtying snapshot!"); 1067 1068 dp = ds->ds_dir->dd_pool; 1069 1070 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1071 /* up the hold count until we can be written out */ 1072 dmu_buf_add_ref(ds->ds_dbuf, ds); 1073 } 1074} 1075 1076boolean_t 1077dsl_dataset_is_dirty(dsl_dataset_t *ds) 1078{ 1079 for (int t = 0; t < TXG_SIZE; t++) { 1080 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1081 ds, t)) 1082 return (B_TRUE); 1083 } 1084 return (B_FALSE); 1085} 1086 1087static int 1088dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1089{ 1090 uint64_t asize; 1091 1092 if (!dmu_tx_is_syncing(tx)) 1093 return (0); 1094 1095 /* 1096 * If there's an fs-only reservation, any blocks that might become 1097 * owned by the snapshot dataset must be accommodated by space 1098 * outside of the reservation. 1099 */ 1100 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1101 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1102 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1103 return (SET_ERROR(ENOSPC)); 1104 1105 /* 1106 * Propagate any reserved space for this snapshot to other 1107 * snapshot checks in this sync group. 1108 */ 1109 if (asize > 0) 1110 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1111 1112 return (0); 1113} 1114 1115typedef struct dsl_dataset_snapshot_arg { 1116 nvlist_t *ddsa_snaps; 1117 nvlist_t *ddsa_props; 1118 nvlist_t *ddsa_errors; 1119 cred_t *ddsa_cr; 1120} dsl_dataset_snapshot_arg_t; 1121 1122int 1123dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1124 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1125{ 1126 int error; 1127 uint64_t value; 1128 1129 ds->ds_trysnap_txg = tx->tx_txg; 1130 1131 if (!dmu_tx_is_syncing(tx)) 1132 return (0); 1133 1134 /* 1135 * We don't allow multiple snapshots of the same txg. If there 1136 * is already one, try again. 1137 */ 1138 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1139 return (SET_ERROR(EAGAIN)); 1140 1141 /* 1142 * Check for conflicting snapshot name. 1143 */ 1144 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1145 if (error == 0) 1146 return (SET_ERROR(EEXIST)); 1147 if (error != ENOENT) 1148 return (error); 1149 1150 /* 1151 * We don't allow taking snapshots of inconsistent datasets, such as 1152 * those into which we are currently receiving. However, if we are 1153 * creating this snapshot as part of a receive, this check will be 1154 * executed atomically with respect to the completion of the receive 1155 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1156 * case we ignore this, knowing it will be fixed up for us shortly in 1157 * dmu_recv_end_sync(). 1158 */ 1159 if (!recv && DS_IS_INCONSISTENT(ds)) 1160 return (SET_ERROR(EBUSY)); 1161 1162 /* 1163 * Skip the check for temporary snapshots or if we have already checked 1164 * the counts in dsl_dataset_snapshot_check. This means we really only 1165 * check the count here when we're receiving a stream. 1166 */ 1167 if (cnt != 0 && cr != NULL) { 1168 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1169 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1170 if (error != 0) 1171 return (error); 1172 } 1173 1174 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1175 if (error != 0) 1176 return (error); 1177 1178 return (0); 1179} 1180 1181static int 1182dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1183{ 1184 dsl_dataset_snapshot_arg_t *ddsa = arg; 1185 dsl_pool_t *dp = dmu_tx_pool(tx); 1186 nvpair_t *pair; 1187 int rv = 0; 1188 1189 /* 1190 * Pre-compute how many total new snapshots will be created for each 1191 * level in the tree and below. This is needed for validating the 1192 * snapshot limit when either taking a recursive snapshot or when 1193 * taking multiple snapshots. 1194 * 1195 * The problem is that the counts are not actually adjusted when 1196 * we are checking, only when we finally sync. For a single snapshot, 1197 * this is easy, the count will increase by 1 at each node up the tree, 1198 * but its more complicated for the recursive/multiple snapshot case. 1199 * 1200 * The dsl_fs_ss_limit_check function does recursively check the count 1201 * at each level up the tree but since it is validating each snapshot 1202 * independently we need to be sure that we are validating the complete 1203 * count for the entire set of snapshots. We do this by rolling up the 1204 * counts for each component of the name into an nvlist and then 1205 * checking each of those cases with the aggregated count. 1206 * 1207 * This approach properly handles not only the recursive snapshot 1208 * case (where we get all of those on the ddsa_snaps list) but also 1209 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1210 * validate the limit on 'a' using a count of 2). 1211 * 1212 * We validate the snapshot names in the third loop and only report 1213 * name errors once. 1214 */ 1215 if (dmu_tx_is_syncing(tx)) { 1216 nvlist_t *cnt_track = NULL; 1217 cnt_track = fnvlist_alloc(); 1218 1219 /* Rollup aggregated counts into the cnt_track list */ 1220 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1221 pair != NULL; 1222 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1223 char *pdelim; 1224 uint64_t val; 1225 char nm[MAXPATHLEN]; 1226 1227 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1228 pdelim = strchr(nm, '@'); 1229 if (pdelim == NULL) 1230 continue; 1231 *pdelim = '\0'; 1232 1233 do { 1234 if (nvlist_lookup_uint64(cnt_track, nm, 1235 &val) == 0) { 1236 /* update existing entry */ 1237 fnvlist_add_uint64(cnt_track, nm, 1238 val + 1); 1239 } else { 1240 /* add to list */ 1241 fnvlist_add_uint64(cnt_track, nm, 1); 1242 } 1243 1244 pdelim = strrchr(nm, '/'); 1245 if (pdelim != NULL) 1246 *pdelim = '\0'; 1247 } while (pdelim != NULL); 1248 } 1249 1250 /* Check aggregated counts at each level */ 1251 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1252 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1253 int error = 0; 1254 char *name; 1255 uint64_t cnt = 0; 1256 dsl_dataset_t *ds; 1257 1258 name = nvpair_name(pair); 1259 cnt = fnvpair_value_uint64(pair); 1260 ASSERT(cnt > 0); 1261 1262 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1263 if (error == 0) { 1264 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1265 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1266 ddsa->ddsa_cr); 1267 dsl_dataset_rele(ds, FTAG); 1268 } 1269 1270 if (error != 0) { 1271 if (ddsa->ddsa_errors != NULL) 1272 fnvlist_add_int32(ddsa->ddsa_errors, 1273 name, error); 1274 rv = error; 1275 /* only report one error for this check */ 1276 break; 1277 } 1278 } 1279 nvlist_free(cnt_track); 1280 } 1281 1282 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1283 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1284 int error = 0; 1285 dsl_dataset_t *ds; 1286 char *name, *atp; 1287 char dsname[MAXNAMELEN]; 1288 1289 name = nvpair_name(pair); 1290 if (strlen(name) >= MAXNAMELEN) 1291 error = SET_ERROR(ENAMETOOLONG); 1292 if (error == 0) { 1293 atp = strchr(name, '@'); 1294 if (atp == NULL) 1295 error = SET_ERROR(EINVAL); 1296 if (error == 0) 1297 (void) strlcpy(dsname, name, atp - name + 1); 1298 } 1299 if (error == 0) 1300 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1301 if (error == 0) { 1302 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1303 error = dsl_dataset_snapshot_check_impl(ds, 1304 atp + 1, tx, B_FALSE, 0, NULL); 1305 dsl_dataset_rele(ds, FTAG); 1306 } 1307 1308 if (error != 0) { 1309 if (ddsa->ddsa_errors != NULL) { 1310 fnvlist_add_int32(ddsa->ddsa_errors, 1311 name, error); 1312 } 1313 rv = error; 1314 } 1315 } 1316 1317 return (rv); 1318} 1319 1320void 1321dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1322 dmu_tx_t *tx) 1323{ 1324 static zil_header_t zero_zil; 1325 1326 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1327 dmu_buf_t *dbuf; 1328 dsl_dataset_phys_t *dsphys; 1329 uint64_t dsobj, crtxg; 1330 objset_t *mos = dp->dp_meta_objset; 1331 objset_t *os; 1332 1333 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1334 1335 /* 1336 * If we are on an old pool, the zil must not be active, in which 1337 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1338 */ 1339 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1340 dmu_objset_from_ds(ds, &os) != 0 || 1341 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1342 sizeof (zero_zil)) == 0); 1343 1344 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1345 1346 /* 1347 * The origin's ds_creation_txg has to be < TXG_INITIAL 1348 */ 1349 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1350 crtxg = 1; 1351 else 1352 crtxg = tx->tx_txg; 1353 1354 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1355 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1356 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1357 dmu_buf_will_dirty(dbuf, tx); 1358 dsphys = dbuf->db_data; 1359 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1360 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1361 dsphys->ds_fsid_guid = unique_create(); 1362 do { 1363 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1364 sizeof (dsphys->ds_guid)); 1365 } while (dsphys->ds_guid == 0); 1366 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1367 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1368 dsphys->ds_next_snap_obj = ds->ds_object; 1369 dsphys->ds_num_children = 1; 1370 dsphys->ds_creation_time = gethrestime_sec(); 1371 dsphys->ds_creation_txg = crtxg; 1372 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1373 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1374 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1375 dsphys->ds_uncompressed_bytes = 1376 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1377 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1378 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1379 dmu_buf_rele(dbuf, FTAG); 1380 1381 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1382 if (ds->ds_feature_inuse[f]) 1383 dsl_dataset_activate_feature(dsobj, f, tx); 1384 } 1385 1386 ASSERT3U(ds->ds_prev != 0, ==, 1387 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1388 if (ds->ds_prev) { 1389 uint64_t next_clones_obj = 1390 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1391 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1392 ds->ds_object || 1393 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1394 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1395 ds->ds_object) { 1396 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1397 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1398 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1399 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1400 } else if (next_clones_obj != 0) { 1401 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1402 dsphys->ds_next_snap_obj, tx); 1403 VERIFY0(zap_add_int(mos, 1404 next_clones_obj, dsobj, tx)); 1405 } 1406 } 1407 1408 /* 1409 * If we have a reference-reservation on this dataset, we will 1410 * need to increase the amount of refreservation being charged 1411 * since our unique space is going to zero. 1412 */ 1413 if (ds->ds_reserved) { 1414 int64_t delta; 1415 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1416 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1417 ds->ds_reserved); 1418 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1419 delta, 0, 0, tx); 1420 } 1421 1422 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1423 dsl_dataset_phys(ds)->ds_deadlist_obj = 1424 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1425 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1426 dsl_deadlist_close(&ds->ds_deadlist); 1427 dsl_deadlist_open(&ds->ds_deadlist, mos, 1428 dsl_dataset_phys(ds)->ds_deadlist_obj); 1429 dsl_deadlist_add_key(&ds->ds_deadlist, 1430 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1431 1432 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1433 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1434 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1435 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1436 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1437 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1438 1439 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1440 snapname, 8, 1, &dsobj, tx)); 1441 1442 if (ds->ds_prev) 1443 dsl_dataset_rele(ds->ds_prev, ds); 1444 VERIFY0(dsl_dataset_hold_obj(dp, 1445 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1446 1447 dsl_scan_ds_snapshotted(ds, tx); 1448 1449 dsl_dir_snap_cmtime_update(ds->ds_dir); 1450 1451 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1452} 1453 1454static void 1455dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1456{ 1457 dsl_dataset_snapshot_arg_t *ddsa = arg; 1458 dsl_pool_t *dp = dmu_tx_pool(tx); 1459 nvpair_t *pair; 1460 1461 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1462 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1463 dsl_dataset_t *ds; 1464 char *name, *atp; 1465 char dsname[MAXNAMELEN]; 1466 1467 name = nvpair_name(pair); 1468 atp = strchr(name, '@'); 1469 (void) strlcpy(dsname, name, atp - name + 1); 1470 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1471 1472 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1473 if (ddsa->ddsa_props != NULL) { 1474 dsl_props_set_sync_impl(ds->ds_prev, 1475 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1476 } 1477 dsl_dataset_rele(ds, FTAG); 1478 } 1479} 1480 1481/* 1482 * The snapshots must all be in the same pool. 1483 * All-or-nothing: if there are any failures, nothing will be modified. 1484 */ 1485int 1486dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1487{ 1488 dsl_dataset_snapshot_arg_t ddsa; 1489 nvpair_t *pair; 1490 boolean_t needsuspend; 1491 int error; 1492 spa_t *spa; 1493 char *firstname; 1494 nvlist_t *suspended = NULL; 1495 1496 pair = nvlist_next_nvpair(snaps, NULL); 1497 if (pair == NULL) 1498 return (0); 1499 firstname = nvpair_name(pair); 1500 1501 error = spa_open(firstname, &spa, FTAG); 1502 if (error != 0) 1503 return (error); 1504 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1505 spa_close(spa, FTAG); 1506 1507 if (needsuspend) { 1508 suspended = fnvlist_alloc(); 1509 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1510 pair = nvlist_next_nvpair(snaps, pair)) { 1511 char fsname[MAXNAMELEN]; 1512 char *snapname = nvpair_name(pair); 1513 char *atp; 1514 void *cookie; 1515 1516 atp = strchr(snapname, '@'); 1517 if (atp == NULL) { 1518 error = SET_ERROR(EINVAL); 1519 break; 1520 } 1521 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1522 1523 error = zil_suspend(fsname, &cookie); 1524 if (error != 0) 1525 break; 1526 fnvlist_add_uint64(suspended, fsname, 1527 (uintptr_t)cookie); 1528 } 1529 } 1530 1531 ddsa.ddsa_snaps = snaps; 1532 ddsa.ddsa_props = props; 1533 ddsa.ddsa_errors = errors; 1534 ddsa.ddsa_cr = CRED(); 1535 1536 if (error == 0) { 1537 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1538 dsl_dataset_snapshot_sync, &ddsa, 1539 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1540 } 1541 1542 if (suspended != NULL) { 1543 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1544 pair = nvlist_next_nvpair(suspended, pair)) { 1545 zil_resume((void *)(uintptr_t) 1546 fnvpair_value_uint64(pair)); 1547 } 1548 fnvlist_free(suspended); 1549 } 1550 1551#ifdef __FreeBSD__ 1552#ifdef _KERNEL 1553 if (error == 0) { 1554 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1555 pair = nvlist_next_nvpair(snaps, pair)) { 1556 char *snapname = nvpair_name(pair); 1557 zvol_create_minors(snapname); 1558 } 1559 } 1560#endif 1561#endif 1562 return (error); 1563} 1564 1565typedef struct dsl_dataset_snapshot_tmp_arg { 1566 const char *ddsta_fsname; 1567 const char *ddsta_snapname; 1568 minor_t ddsta_cleanup_minor; 1569 const char *ddsta_htag; 1570} dsl_dataset_snapshot_tmp_arg_t; 1571 1572static int 1573dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1574{ 1575 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1576 dsl_pool_t *dp = dmu_tx_pool(tx); 1577 dsl_dataset_t *ds; 1578 int error; 1579 1580 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1581 if (error != 0) 1582 return (error); 1583 1584 /* NULL cred means no limit check for tmp snapshot */ 1585 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1586 tx, B_FALSE, 0, NULL); 1587 if (error != 0) { 1588 dsl_dataset_rele(ds, FTAG); 1589 return (error); 1590 } 1591 1592 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1593 dsl_dataset_rele(ds, FTAG); 1594 return (SET_ERROR(ENOTSUP)); 1595 } 1596 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1597 B_TRUE, tx); 1598 if (error != 0) { 1599 dsl_dataset_rele(ds, FTAG); 1600 return (error); 1601 } 1602 1603 dsl_dataset_rele(ds, FTAG); 1604 return (0); 1605} 1606 1607static void 1608dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1609{ 1610 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1611 dsl_pool_t *dp = dmu_tx_pool(tx); 1612 dsl_dataset_t *ds; 1613 1614 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1615 1616 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1617 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1618 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1619 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1620 1621 dsl_dataset_rele(ds, FTAG); 1622} 1623 1624int 1625dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1626 minor_t cleanup_minor, const char *htag) 1627{ 1628 dsl_dataset_snapshot_tmp_arg_t ddsta; 1629 int error; 1630 spa_t *spa; 1631 boolean_t needsuspend; 1632 void *cookie; 1633 1634 ddsta.ddsta_fsname = fsname; 1635 ddsta.ddsta_snapname = snapname; 1636 ddsta.ddsta_cleanup_minor = cleanup_minor; 1637 ddsta.ddsta_htag = htag; 1638 1639 error = spa_open(fsname, &spa, FTAG); 1640 if (error != 0) 1641 return (error); 1642 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1643 spa_close(spa, FTAG); 1644 1645 if (needsuspend) { 1646 error = zil_suspend(fsname, &cookie); 1647 if (error != 0) 1648 return (error); 1649 } 1650 1651 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1652 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1653 1654 if (needsuspend) 1655 zil_resume(cookie); 1656 return (error); 1657} 1658 1659 1660void 1661dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1662{ 1663 ASSERT(dmu_tx_is_syncing(tx)); 1664 ASSERT(ds->ds_objset != NULL); 1665 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1666 1667 /* 1668 * in case we had to change ds_fsid_guid when we opened it, 1669 * sync it out now. 1670 */ 1671 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1672 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1673 1674 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1675 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1676 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1677 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1678 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1679 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1680 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1681 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1682 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1683 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1684 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1685 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1686 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1687 } 1688 1689 dmu_objset_sync(ds->ds_objset, zio, tx); 1690 1691 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1692 if (ds->ds_feature_activation_needed[f]) { 1693 if (ds->ds_feature_inuse[f]) 1694 continue; 1695 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1696 ds->ds_feature_inuse[f] = B_TRUE; 1697 } 1698 } 1699} 1700 1701static void 1702get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1703{ 1704 uint64_t count = 0; 1705 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1706 zap_cursor_t zc; 1707 zap_attribute_t za; 1708 nvlist_t *propval = fnvlist_alloc(); 1709 nvlist_t *val = fnvlist_alloc(); 1710 1711 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1712 1713 /* 1714 * There may be missing entries in ds_next_clones_obj 1715 * due to a bug in a previous version of the code. 1716 * Only trust it if it has the right number of entries. 1717 */ 1718 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1719 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1720 &count)); 1721 } 1722 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1723 goto fail; 1724 for (zap_cursor_init(&zc, mos, 1725 dsl_dataset_phys(ds)->ds_next_clones_obj); 1726 zap_cursor_retrieve(&zc, &za) == 0; 1727 zap_cursor_advance(&zc)) { 1728 dsl_dataset_t *clone; 1729 char buf[ZFS_MAXNAMELEN]; 1730 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1731 za.za_first_integer, FTAG, &clone)); 1732 dsl_dir_name(clone->ds_dir, buf); 1733 fnvlist_add_boolean(val, buf); 1734 dsl_dataset_rele(clone, FTAG); 1735 } 1736 zap_cursor_fini(&zc); 1737 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1738 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1739fail: 1740 nvlist_free(val); 1741 nvlist_free(propval); 1742} 1743 1744static void 1745get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1746{ 1747 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1748 1749 if (dsl_dataset_has_resume_receive_state(ds)) { 1750 char *str; 1751 void *packed; 1752 uint8_t *compressed; 1753 uint64_t val; 1754 nvlist_t *token_nv = fnvlist_alloc(); 1755 size_t packed_size, compressed_size; 1756 1757 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1758 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1759 fnvlist_add_uint64(token_nv, "fromguid", val); 1760 } 1761 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1762 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1763 fnvlist_add_uint64(token_nv, "object", val); 1764 } 1765 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1766 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1767 fnvlist_add_uint64(token_nv, "offset", val); 1768 } 1769 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1770 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1771 fnvlist_add_uint64(token_nv, "bytes", val); 1772 } 1773 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1774 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1775 fnvlist_add_uint64(token_nv, "toguid", val); 1776 } 1777 char buf[256]; 1778 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1779 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1780 fnvlist_add_string(token_nv, "toname", buf); 1781 } 1782 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1783 DS_FIELD_RESUME_EMBEDOK) == 0) { 1784 fnvlist_add_boolean(token_nv, "embedok"); 1785 } 1786 packed = fnvlist_pack(token_nv, &packed_size); 1787 fnvlist_free(token_nv); 1788 compressed = kmem_alloc(packed_size, KM_SLEEP); 1789 1790 compressed_size = gzip_compress(packed, compressed, 1791 packed_size, packed_size, 6); 1792 1793 zio_cksum_t cksum; 1794 fletcher_4_native(compressed, compressed_size, &cksum); 1795 1796 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1797 for (int i = 0; i < compressed_size; i++) { 1798 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1799 } 1800 str[compressed_size * 2] = '\0'; 1801 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1802 ZFS_SEND_RESUME_TOKEN_VERSION, 1803 (longlong_t)cksum.zc_word[0], 1804 (longlong_t)packed_size, str); 1805 dsl_prop_nvlist_add_string(nv, 1806 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1807 kmem_free(packed, packed_size); 1808 kmem_free(str, compressed_size * 2 + 1); 1809 kmem_free(compressed, packed_size); 1810 strfree(propval); 1811 } 1812} 1813 1814void 1815dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1816{ 1817 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1818 uint64_t refd, avail, uobjs, aobjs, ratio; 1819 1820 ASSERT(dsl_pool_config_held(dp)); 1821 1822 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1823 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1824 dsl_dataset_phys(ds)->ds_compressed_bytes); 1825 1826 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1827 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1828 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1829 1830 if (ds->ds_is_snapshot) { 1831 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1832 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1833 dsl_dataset_phys(ds)->ds_unique_bytes); 1834 get_clones_stat(ds, nv); 1835 } else { 1836 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1837 char buf[MAXNAMELEN]; 1838 dsl_dataset_name(ds->ds_prev, buf); 1839 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1840 } 1841 1842 dsl_dir_stats(ds->ds_dir, nv); 1843 } 1844 1845 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1846 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1847 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1848 1849 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1850 dsl_dataset_phys(ds)->ds_creation_time); 1851 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1852 dsl_dataset_phys(ds)->ds_creation_txg); 1853 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1854 ds->ds_quota); 1855 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1856 ds->ds_reserved); 1857 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1858 dsl_dataset_phys(ds)->ds_guid); 1859 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1860 dsl_dataset_phys(ds)->ds_unique_bytes); 1861 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1862 ds->ds_object); 1863 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1864 ds->ds_userrefs); 1865 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1866 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1867 1868 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1869 uint64_t written, comp, uncomp; 1870 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1871 dsl_dataset_t *prev; 1872 1873 int err = dsl_dataset_hold_obj(dp, 1874 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1875 if (err == 0) { 1876 err = dsl_dataset_space_written(prev, ds, &written, 1877 &comp, &uncomp); 1878 dsl_dataset_rele(prev, FTAG); 1879 if (err == 0) { 1880 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1881 written); 1882 } 1883 } 1884 } 1885 1886 if (!dsl_dataset_is_snapshot(ds)) { 1887 /* 1888 * A failed "newfs" (e.g. full) resumable receive leaves 1889 * the stats set on this dataset. Check here for the prop. 1890 */ 1891 get_receive_resume_stats(ds, nv); 1892 1893 /* 1894 * A failed incremental resumable receive leaves the 1895 * stats set on our child named "%recv". Check the child 1896 * for the prop. 1897 */ 1898 char recvname[ZFS_MAXNAMELEN]; 1899 dsl_dataset_t *recv_ds; 1900 dsl_dataset_name(ds, recvname); 1901 (void) strcat(recvname, "/"); 1902 (void) strcat(recvname, recv_clone_name); 1903 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1904 get_receive_resume_stats(recv_ds, nv); 1905 dsl_dataset_rele(recv_ds, FTAG); 1906 } 1907 } 1908} 1909 1910void 1911dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1912{ 1913 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1914 ASSERT(dsl_pool_config_held(dp)); 1915 1916 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1917 stat->dds_inconsistent = 1918 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1919 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1920 stat->dds_origin[0] = '\0'; 1921 if (ds->ds_is_snapshot) { 1922 stat->dds_is_snapshot = B_TRUE; 1923 stat->dds_num_clones = 1924 dsl_dataset_phys(ds)->ds_num_children - 1; 1925 } else { 1926 stat->dds_is_snapshot = B_FALSE; 1927 stat->dds_num_clones = 0; 1928 1929 if (dsl_dir_is_clone(ds->ds_dir)) { 1930 dsl_dataset_t *ods; 1931 1932 VERIFY0(dsl_dataset_hold_obj(dp, 1933 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1934 FTAG, &ods)); 1935 dsl_dataset_name(ods, stat->dds_origin); 1936 dsl_dataset_rele(ods, FTAG); 1937 } 1938 } 1939} 1940 1941uint64_t 1942dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1943{ 1944 return (ds->ds_fsid_guid); 1945} 1946 1947void 1948dsl_dataset_space(dsl_dataset_t *ds, 1949 uint64_t *refdbytesp, uint64_t *availbytesp, 1950 uint64_t *usedobjsp, uint64_t *availobjsp) 1951{ 1952 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1953 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1954 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1955 *availbytesp += 1956 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1957 if (ds->ds_quota != 0) { 1958 /* 1959 * Adjust available bytes according to refquota 1960 */ 1961 if (*refdbytesp < ds->ds_quota) 1962 *availbytesp = MIN(*availbytesp, 1963 ds->ds_quota - *refdbytesp); 1964 else 1965 *availbytesp = 0; 1966 } 1967 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1968 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1969} 1970 1971boolean_t 1972dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1973{ 1974 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1975 1976 ASSERT(dsl_pool_config_held(dp)); 1977 if (snap == NULL) 1978 return (B_FALSE); 1979 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1980 dsl_dataset_phys(snap)->ds_creation_txg) { 1981 objset_t *os, *os_snap; 1982 /* 1983 * It may be that only the ZIL differs, because it was 1984 * reset in the head. Don't count that as being 1985 * modified. 1986 */ 1987 if (dmu_objset_from_ds(ds, &os) != 0) 1988 return (B_TRUE); 1989 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1990 return (B_TRUE); 1991 return (bcmp(&os->os_phys->os_meta_dnode, 1992 &os_snap->os_phys->os_meta_dnode, 1993 sizeof (os->os_phys->os_meta_dnode)) != 0); 1994 } 1995 return (B_FALSE); 1996} 1997 1998typedef struct dsl_dataset_rename_snapshot_arg { 1999 const char *ddrsa_fsname; 2000 const char *ddrsa_oldsnapname; 2001 const char *ddrsa_newsnapname; 2002 boolean_t ddrsa_recursive; 2003 dmu_tx_t *ddrsa_tx; 2004} dsl_dataset_rename_snapshot_arg_t; 2005 2006/* ARGSUSED */ 2007static int 2008dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 2009 dsl_dataset_t *hds, void *arg) 2010{ 2011 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2012 int error; 2013 uint64_t val; 2014 2015 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2016 if (error != 0) { 2017 /* ignore nonexistent snapshots */ 2018 return (error == ENOENT ? 0 : error); 2019 } 2020 2021 /* new name should not exist */ 2022 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 2023 if (error == 0) 2024 error = SET_ERROR(EEXIST); 2025 else if (error == ENOENT) 2026 error = 0; 2027 2028 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2029 if (dsl_dir_namelen(hds->ds_dir) + 1 + 2030 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 2031 error = SET_ERROR(ENAMETOOLONG); 2032 2033 return (error); 2034} 2035 2036static int 2037dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 2038{ 2039 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2040 dsl_pool_t *dp = dmu_tx_pool(tx); 2041 dsl_dataset_t *hds; 2042 int error; 2043 2044 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 2045 if (error != 0) 2046 return (error); 2047 2048 if (ddrsa->ddrsa_recursive) { 2049 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2050 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2051 DS_FIND_CHILDREN); 2052 } else { 2053 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2054 } 2055 dsl_dataset_rele(hds, FTAG); 2056 return (error); 2057} 2058 2059static int 2060dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2061 dsl_dataset_t *hds, void *arg) 2062{ 2063#ifdef __FreeBSD__ 2064#ifdef _KERNEL 2065 char *oldname, *newname; 2066#endif 2067#endif 2068 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2069 dsl_dataset_t *ds; 2070 uint64_t val; 2071 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2072 int error; 2073 2074 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2075 ASSERT(error == 0 || error == ENOENT); 2076 if (error == ENOENT) { 2077 /* ignore nonexistent snapshots */ 2078 return (0); 2079 } 2080 2081 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2082 2083 /* log before we change the name */ 2084 spa_history_log_internal_ds(ds, "rename", tx, 2085 "-> @%s", ddrsa->ddrsa_newsnapname); 2086 2087 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2088 B_FALSE)); 2089 mutex_enter(&ds->ds_lock); 2090 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2091 mutex_exit(&ds->ds_lock); 2092 VERIFY0(zap_add(dp->dp_meta_objset, 2093 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2094 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2095 2096#ifdef __FreeBSD__ 2097#ifdef _KERNEL 2098 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2099 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2100 snprintf(oldname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2101 ddrsa->ddrsa_oldsnapname); 2102 snprintf(newname, MAXPATHLEN, "%s@%s", ddrsa->ddrsa_fsname, 2103 ddrsa->ddrsa_newsnapname); 2104 zfsvfs_update_fromname(oldname, newname); 2105 zvol_rename_minors(oldname, newname); 2106 kmem_free(newname, MAXPATHLEN); 2107 kmem_free(oldname, MAXPATHLEN); 2108#endif 2109#endif 2110 dsl_dataset_rele(ds, FTAG); 2111 2112 return (0); 2113} 2114 2115static void 2116dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2117{ 2118 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2119 dsl_pool_t *dp = dmu_tx_pool(tx); 2120 dsl_dataset_t *hds; 2121 2122 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2123 ddrsa->ddrsa_tx = tx; 2124 if (ddrsa->ddrsa_recursive) { 2125 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2126 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2127 DS_FIND_CHILDREN)); 2128 } else { 2129 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2130 } 2131 dsl_dataset_rele(hds, FTAG); 2132} 2133 2134int 2135dsl_dataset_rename_snapshot(const char *fsname, 2136 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2137{ 2138 dsl_dataset_rename_snapshot_arg_t ddrsa; 2139 2140 ddrsa.ddrsa_fsname = fsname; 2141 ddrsa.ddrsa_oldsnapname = oldsnapname; 2142 ddrsa.ddrsa_newsnapname = newsnapname; 2143 ddrsa.ddrsa_recursive = recursive; 2144 2145 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2146 dsl_dataset_rename_snapshot_sync, &ddrsa, 2147 1, ZFS_SPACE_CHECK_RESERVED)); 2148} 2149 2150/* 2151 * If we're doing an ownership handoff, we need to make sure that there is 2152 * only one long hold on the dataset. We're not allowed to change anything here 2153 * so we don't permanently release the long hold or regular hold here. We want 2154 * to do this only when syncing to avoid the dataset unexpectedly going away 2155 * when we release the long hold. 2156 */ 2157static int 2158dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2159{ 2160 boolean_t held; 2161 2162 if (!dmu_tx_is_syncing(tx)) 2163 return (0); 2164 2165 if (owner != NULL) { 2166 VERIFY3P(ds->ds_owner, ==, owner); 2167 dsl_dataset_long_rele(ds, owner); 2168 } 2169 2170 held = dsl_dataset_long_held(ds); 2171 2172 if (owner != NULL) 2173 dsl_dataset_long_hold(ds, owner); 2174 2175 if (held) 2176 return (SET_ERROR(EBUSY)); 2177 2178 return (0); 2179} 2180 2181typedef struct dsl_dataset_rollback_arg { 2182 const char *ddra_fsname; 2183 void *ddra_owner; 2184 nvlist_t *ddra_result; 2185} dsl_dataset_rollback_arg_t; 2186 2187static int 2188dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2189{ 2190 dsl_dataset_rollback_arg_t *ddra = arg; 2191 dsl_pool_t *dp = dmu_tx_pool(tx); 2192 dsl_dataset_t *ds; 2193 int64_t unused_refres_delta; 2194 int error; 2195 2196 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2197 if (error != 0) 2198 return (error); 2199 2200 /* must not be a snapshot */ 2201 if (ds->ds_is_snapshot) { 2202 dsl_dataset_rele(ds, FTAG); 2203 return (SET_ERROR(EINVAL)); 2204 } 2205 2206 /* must have a most recent snapshot */ 2207 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2208 dsl_dataset_rele(ds, FTAG); 2209 return (SET_ERROR(EINVAL)); 2210 } 2211 2212 /* must not have any bookmarks after the most recent snapshot */ 2213 nvlist_t *proprequest = fnvlist_alloc(); 2214 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2215 nvlist_t *bookmarks = fnvlist_alloc(); 2216 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2217 fnvlist_free(proprequest); 2218 if (error != 0) 2219 return (error); 2220 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2221 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2222 nvlist_t *valuenv = 2223 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2224 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2225 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2226 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2227 fnvlist_free(bookmarks); 2228 dsl_dataset_rele(ds, FTAG); 2229 return (SET_ERROR(EEXIST)); 2230 } 2231 } 2232 fnvlist_free(bookmarks); 2233 2234 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2235 if (error != 0) { 2236 dsl_dataset_rele(ds, FTAG); 2237 return (error); 2238 } 2239 2240 /* 2241 * Check if the snap we are rolling back to uses more than 2242 * the refquota. 2243 */ 2244 if (ds->ds_quota != 0 && 2245 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2246 dsl_dataset_rele(ds, FTAG); 2247 return (SET_ERROR(EDQUOT)); 2248 } 2249 2250 /* 2251 * When we do the clone swap, we will temporarily use more space 2252 * due to the refreservation (the head will no longer have any 2253 * unique space, so the entire amount of the refreservation will need 2254 * to be free). We will immediately destroy the clone, freeing 2255 * this space, but the freeing happens over many txg's. 2256 */ 2257 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2258 dsl_dataset_phys(ds)->ds_unique_bytes); 2259 2260 if (unused_refres_delta > 0 && 2261 unused_refres_delta > 2262 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2263 dsl_dataset_rele(ds, FTAG); 2264 return (SET_ERROR(ENOSPC)); 2265 } 2266 2267 dsl_dataset_rele(ds, FTAG); 2268 return (0); 2269} 2270 2271static void 2272dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2273{ 2274 dsl_dataset_rollback_arg_t *ddra = arg; 2275 dsl_pool_t *dp = dmu_tx_pool(tx); 2276 dsl_dataset_t *ds, *clone; 2277 uint64_t cloneobj; 2278 char namebuf[ZFS_MAXNAMELEN]; 2279 2280 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2281 2282 dsl_dataset_name(ds->ds_prev, namebuf); 2283 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2284 2285 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2286 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2287 2288 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2289 2290 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2291 dsl_dataset_zero_zil(ds, tx); 2292 2293 dsl_destroy_head_sync_impl(clone, tx); 2294 2295 dsl_dataset_rele(clone, FTAG); 2296 dsl_dataset_rele(ds, FTAG); 2297} 2298 2299/* 2300 * Rolls back the given filesystem or volume to the most recent snapshot. 2301 * The name of the most recent snapshot will be returned under key "target" 2302 * in the result nvlist. 2303 * 2304 * If owner != NULL: 2305 * - The existing dataset MUST be owned by the specified owner at entry 2306 * - Upon return, dataset will still be held by the same owner, whether we 2307 * succeed or not. 2308 * 2309 * This mode is required any time the existing filesystem is mounted. See 2310 * notes above zfs_suspend_fs() for further details. 2311 */ 2312int 2313dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2314{ 2315 dsl_dataset_rollback_arg_t ddra; 2316 2317 ddra.ddra_fsname = fsname; 2318 ddra.ddra_owner = owner; 2319 ddra.ddra_result = result; 2320 2321 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2322 dsl_dataset_rollback_sync, &ddra, 2323 1, ZFS_SPACE_CHECK_RESERVED)); 2324} 2325 2326struct promotenode { 2327 list_node_t link; 2328 dsl_dataset_t *ds; 2329}; 2330 2331typedef struct dsl_dataset_promote_arg { 2332 const char *ddpa_clonename; 2333 dsl_dataset_t *ddpa_clone; 2334 list_t shared_snaps, origin_snaps, clone_snaps; 2335 dsl_dataset_t *origin_origin; /* origin of the origin */ 2336 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2337 char *err_ds; 2338 cred_t *cr; 2339} dsl_dataset_promote_arg_t; 2340 2341static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2342static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2343 void *tag); 2344static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2345 2346static int 2347dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2348{ 2349 dsl_dataset_promote_arg_t *ddpa = arg; 2350 dsl_pool_t *dp = dmu_tx_pool(tx); 2351 dsl_dataset_t *hds; 2352 struct promotenode *snap; 2353 dsl_dataset_t *origin_ds; 2354 int err; 2355 uint64_t unused; 2356 uint64_t ss_mv_cnt; 2357 size_t max_snap_len; 2358 2359 err = promote_hold(ddpa, dp, FTAG); 2360 if (err != 0) 2361 return (err); 2362 2363 hds = ddpa->ddpa_clone; 2364 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2365 2366 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2367 promote_rele(ddpa, FTAG); 2368 return (SET_ERROR(EXDEV)); 2369 } 2370 2371 /* 2372 * Compute and check the amount of space to transfer. Since this is 2373 * so expensive, don't do the preliminary check. 2374 */ 2375 if (!dmu_tx_is_syncing(tx)) { 2376 promote_rele(ddpa, FTAG); 2377 return (0); 2378 } 2379 2380 snap = list_head(&ddpa->shared_snaps); 2381 origin_ds = snap->ds; 2382 2383 /* compute origin's new unique space */ 2384 snap = list_tail(&ddpa->clone_snaps); 2385 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2386 origin_ds->ds_object); 2387 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2388 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2389 &ddpa->unique, &unused, &unused); 2390 2391 /* 2392 * Walk the snapshots that we are moving 2393 * 2394 * Compute space to transfer. Consider the incremental changes 2395 * to used by each snapshot: 2396 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2397 * So each snapshot gave birth to: 2398 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2399 * So a sequence would look like: 2400 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2401 * Which simplifies to: 2402 * uN + kN + kN-1 + ... + k1 + k0 2403 * Note however, if we stop before we reach the ORIGIN we get: 2404 * uN + kN + kN-1 + ... + kM - uM-1 2405 */ 2406 ss_mv_cnt = 0; 2407 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2408 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2409 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2410 for (snap = list_head(&ddpa->shared_snaps); snap; 2411 snap = list_next(&ddpa->shared_snaps, snap)) { 2412 uint64_t val, dlused, dlcomp, dluncomp; 2413 dsl_dataset_t *ds = snap->ds; 2414 2415 ss_mv_cnt++; 2416 2417 /* 2418 * If there are long holds, we won't be able to evict 2419 * the objset. 2420 */ 2421 if (dsl_dataset_long_held(ds)) { 2422 err = SET_ERROR(EBUSY); 2423 goto out; 2424 } 2425 2426 /* Check that the snapshot name does not conflict */ 2427 VERIFY0(dsl_dataset_get_snapname(ds)); 2428 if (strlen(ds->ds_snapname) >= max_snap_len) { 2429 err = SET_ERROR(ENAMETOOLONG); 2430 goto out; 2431 } 2432 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2433 if (err == 0) { 2434 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2435 err = SET_ERROR(EEXIST); 2436 goto out; 2437 } 2438 if (err != ENOENT) 2439 goto out; 2440 2441 /* The very first snapshot does not have a deadlist */ 2442 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2443 continue; 2444 2445 dsl_deadlist_space(&ds->ds_deadlist, 2446 &dlused, &dlcomp, &dluncomp); 2447 ddpa->used += dlused; 2448 ddpa->comp += dlcomp; 2449 ddpa->uncomp += dluncomp; 2450 } 2451 2452 /* 2453 * If we are a clone of a clone then we never reached ORIGIN, 2454 * so we need to subtract out the clone origin's used space. 2455 */ 2456 if (ddpa->origin_origin) { 2457 ddpa->used -= 2458 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2459 ddpa->comp -= 2460 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2461 ddpa->uncomp -= 2462 dsl_dataset_phys(ddpa->origin_origin)-> 2463 ds_uncompressed_bytes; 2464 } 2465 2466 /* Check that there is enough space and limit headroom here */ 2467 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2468 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2469 if (err != 0) 2470 goto out; 2471 2472 /* 2473 * Compute the amounts of space that will be used by snapshots 2474 * after the promotion (for both origin and clone). For each, 2475 * it is the amount of space that will be on all of their 2476 * deadlists (that was not born before their new origin). 2477 */ 2478 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2479 uint64_t space; 2480 2481 /* 2482 * Note, typically this will not be a clone of a clone, 2483 * so dd_origin_txg will be < TXG_INITIAL, so 2484 * these snaplist_space() -> dsl_deadlist_space_range() 2485 * calls will be fast because they do not have to 2486 * iterate over all bps. 2487 */ 2488 snap = list_head(&ddpa->origin_snaps); 2489 err = snaplist_space(&ddpa->shared_snaps, 2490 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2491 if (err != 0) 2492 goto out; 2493 2494 err = snaplist_space(&ddpa->clone_snaps, 2495 snap->ds->ds_dir->dd_origin_txg, &space); 2496 if (err != 0) 2497 goto out; 2498 ddpa->cloneusedsnap += space; 2499 } 2500 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2501 DD_FLAG_USED_BREAKDOWN) { 2502 err = snaplist_space(&ddpa->origin_snaps, 2503 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2504 &ddpa->originusedsnap); 2505 if (err != 0) 2506 goto out; 2507 } 2508 2509out: 2510 promote_rele(ddpa, FTAG); 2511 return (err); 2512} 2513 2514static void 2515dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2516{ 2517 dsl_dataset_promote_arg_t *ddpa = arg; 2518 dsl_pool_t *dp = dmu_tx_pool(tx); 2519 dsl_dataset_t *hds; 2520 struct promotenode *snap; 2521 dsl_dataset_t *origin_ds; 2522 dsl_dataset_t *origin_head; 2523 dsl_dir_t *dd; 2524 dsl_dir_t *odd = NULL; 2525 uint64_t oldnext_obj; 2526 int64_t delta; 2527#if defined(__FreeBSD__) && defined(_KERNEL) 2528 char *oldname, *newname; 2529#endif 2530 2531 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2532 hds = ddpa->ddpa_clone; 2533 2534 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2535 2536 snap = list_head(&ddpa->shared_snaps); 2537 origin_ds = snap->ds; 2538 dd = hds->ds_dir; 2539 2540 snap = list_head(&ddpa->origin_snaps); 2541 origin_head = snap->ds; 2542 2543 /* 2544 * We need to explicitly open odd, since origin_ds's dd will be 2545 * changing. 2546 */ 2547 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2548 NULL, FTAG, &odd)); 2549 2550 /* change origin's next snap */ 2551 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2552 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2553 snap = list_tail(&ddpa->clone_snaps); 2554 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2555 origin_ds->ds_object); 2556 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2557 2558 /* change the origin's next clone */ 2559 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2560 dsl_dataset_remove_from_next_clones(origin_ds, 2561 snap->ds->ds_object, tx); 2562 VERIFY0(zap_add_int(dp->dp_meta_objset, 2563 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2564 oldnext_obj, tx)); 2565 } 2566 2567 /* change origin */ 2568 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2569 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2570 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2571 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2572 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2573 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2574 origin_head->ds_dir->dd_origin_txg = 2575 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2576 2577 /* change dd_clone entries */ 2578 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2579 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2580 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2581 VERIFY0(zap_add_int(dp->dp_meta_objset, 2582 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2583 hds->ds_object, tx)); 2584 2585 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2586 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2587 origin_head->ds_object, tx)); 2588 if (dsl_dir_phys(dd)->dd_clones == 0) { 2589 dsl_dir_phys(dd)->dd_clones = 2590 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2591 DMU_OT_NONE, 0, tx); 2592 } 2593 VERIFY0(zap_add_int(dp->dp_meta_objset, 2594 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2595 } 2596 2597#if defined(__FreeBSD__) && defined(_KERNEL) 2598 /* Take the spa_namespace_lock early so zvol renames don't deadlock. */ 2599 mutex_enter(&spa_namespace_lock); 2600 2601 oldname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2602 newname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2603#endif 2604 2605 /* move snapshots to this dir */ 2606 for (snap = list_head(&ddpa->shared_snaps); snap; 2607 snap = list_next(&ddpa->shared_snaps, snap)) { 2608 dsl_dataset_t *ds = snap->ds; 2609 2610 /* 2611 * Property callbacks are registered to a particular 2612 * dsl_dir. Since ours is changing, evict the objset 2613 * so that they will be unregistered from the old dsl_dir. 2614 */ 2615 if (ds->ds_objset) { 2616 dmu_objset_evict(ds->ds_objset); 2617 ds->ds_objset = NULL; 2618 } 2619 2620 /* move snap name entry */ 2621 VERIFY0(dsl_dataset_get_snapname(ds)); 2622 VERIFY0(dsl_dataset_snap_remove(origin_head, 2623 ds->ds_snapname, tx, B_TRUE)); 2624 VERIFY0(zap_add(dp->dp_meta_objset, 2625 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2626 8, 1, &ds->ds_object, tx)); 2627 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2628 DD_FIELD_SNAPSHOT_COUNT, tx); 2629 2630 /* change containing dsl_dir */ 2631 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2632 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2633 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2634 ASSERT3P(ds->ds_dir, ==, odd); 2635 dsl_dir_rele(ds->ds_dir, ds); 2636 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2637 NULL, ds, &ds->ds_dir)); 2638 2639#if defined(__FreeBSD__) && defined(_KERNEL) 2640 dsl_dataset_name(ds, newname); 2641 zfsvfs_update_fromname(oldname, newname); 2642 zvol_rename_minors(oldname, newname); 2643#endif 2644 2645 /* move any clone references */ 2646 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2647 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2648 zap_cursor_t zc; 2649 zap_attribute_t za; 2650 2651 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2652 dsl_dataset_phys(ds)->ds_next_clones_obj); 2653 zap_cursor_retrieve(&zc, &za) == 0; 2654 zap_cursor_advance(&zc)) { 2655 dsl_dataset_t *cnds; 2656 uint64_t o; 2657 2658 if (za.za_first_integer == oldnext_obj) { 2659 /* 2660 * We've already moved the 2661 * origin's reference. 2662 */ 2663 continue; 2664 } 2665 2666 VERIFY0(dsl_dataset_hold_obj(dp, 2667 za.za_first_integer, FTAG, &cnds)); 2668 o = dsl_dir_phys(cnds->ds_dir)-> 2669 dd_head_dataset_obj; 2670 2671 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2672 dsl_dir_phys(odd)->dd_clones, o, tx)); 2673 VERIFY0(zap_add_int(dp->dp_meta_objset, 2674 dsl_dir_phys(dd)->dd_clones, o, tx)); 2675 dsl_dataset_rele(cnds, FTAG); 2676 } 2677 zap_cursor_fini(&zc); 2678 } 2679 2680 ASSERT(!dsl_prop_hascb(ds)); 2681 } 2682 2683#if defined(__FreeBSD__) && defined(_KERNEL) 2684 mutex_exit(&spa_namespace_lock); 2685 2686 kmem_free(newname, MAXPATHLEN); 2687 kmem_free(oldname, MAXPATHLEN); 2688#endif 2689 /* 2690 * Change space accounting. 2691 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2692 * both be valid, or both be 0 (resulting in delta == 0). This 2693 * is true for each of {clone,origin} independently. 2694 */ 2695 2696 delta = ddpa->cloneusedsnap - 2697 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2698 ASSERT3S(delta, >=, 0); 2699 ASSERT3U(ddpa->used, >=, delta); 2700 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2701 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2702 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2703 2704 delta = ddpa->originusedsnap - 2705 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2706 ASSERT3S(delta, <=, 0); 2707 ASSERT3U(ddpa->used, >=, -delta); 2708 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2709 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2710 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2711 2712 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2713 2714 /* log history record */ 2715 spa_history_log_internal_ds(hds, "promote", tx, ""); 2716 2717 dsl_dir_rele(odd, FTAG); 2718 promote_rele(ddpa, FTAG); 2719} 2720 2721/* 2722 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2723 * (exclusive) and last_obj (inclusive). The list will be in reverse 2724 * order (last_obj will be the list_head()). If first_obj == 0, do all 2725 * snapshots back to this dataset's origin. 2726 */ 2727static int 2728snaplist_make(dsl_pool_t *dp, 2729 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2730{ 2731 uint64_t obj = last_obj; 2732 2733 list_create(l, sizeof (struct promotenode), 2734 offsetof(struct promotenode, link)); 2735 2736 while (obj != first_obj) { 2737 dsl_dataset_t *ds; 2738 struct promotenode *snap; 2739 int err; 2740 2741 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2742 ASSERT(err != ENOENT); 2743 if (err != 0) 2744 return (err); 2745 2746 if (first_obj == 0) 2747 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2748 2749 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2750 snap->ds = ds; 2751 list_insert_tail(l, snap); 2752 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2753 } 2754 2755 return (0); 2756} 2757 2758static int 2759snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2760{ 2761 struct promotenode *snap; 2762 2763 *spacep = 0; 2764 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2765 uint64_t used, comp, uncomp; 2766 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2767 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2768 *spacep += used; 2769 } 2770 return (0); 2771} 2772 2773static void 2774snaplist_destroy(list_t *l, void *tag) 2775{ 2776 struct promotenode *snap; 2777 2778 if (l == NULL || !list_link_active(&l->list_head)) 2779 return; 2780 2781 while ((snap = list_tail(l)) != NULL) { 2782 list_remove(l, snap); 2783 dsl_dataset_rele(snap->ds, tag); 2784 kmem_free(snap, sizeof (*snap)); 2785 } 2786 list_destroy(l); 2787} 2788 2789static int 2790promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2791{ 2792 int error; 2793 dsl_dir_t *dd; 2794 struct promotenode *snap; 2795 2796 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2797 &ddpa->ddpa_clone); 2798 if (error != 0) 2799 return (error); 2800 dd = ddpa->ddpa_clone->ds_dir; 2801 2802 if (ddpa->ddpa_clone->ds_is_snapshot || 2803 !dsl_dir_is_clone(dd)) { 2804 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2805 return (SET_ERROR(EINVAL)); 2806 } 2807 2808 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2809 &ddpa->shared_snaps, tag); 2810 if (error != 0) 2811 goto out; 2812 2813 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2814 &ddpa->clone_snaps, tag); 2815 if (error != 0) 2816 goto out; 2817 2818 snap = list_head(&ddpa->shared_snaps); 2819 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2820 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2821 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2822 &ddpa->origin_snaps, tag); 2823 if (error != 0) 2824 goto out; 2825 2826 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2827 error = dsl_dataset_hold_obj(dp, 2828 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2829 tag, &ddpa->origin_origin); 2830 if (error != 0) 2831 goto out; 2832 } 2833out: 2834 if (error != 0) 2835 promote_rele(ddpa, tag); 2836 return (error); 2837} 2838 2839static void 2840promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2841{ 2842 snaplist_destroy(&ddpa->shared_snaps, tag); 2843 snaplist_destroy(&ddpa->clone_snaps, tag); 2844 snaplist_destroy(&ddpa->origin_snaps, tag); 2845 if (ddpa->origin_origin != NULL) 2846 dsl_dataset_rele(ddpa->origin_origin, tag); 2847 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2848} 2849 2850/* 2851 * Promote a clone. 2852 * 2853 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2854 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2855 */ 2856int 2857dsl_dataset_promote(const char *name, char *conflsnap) 2858{ 2859 dsl_dataset_promote_arg_t ddpa = { 0 }; 2860 uint64_t numsnaps; 2861 int error; 2862 objset_t *os; 2863 2864 /* 2865 * We will modify space proportional to the number of 2866 * snapshots. Compute numsnaps. 2867 */ 2868 error = dmu_objset_hold(name, FTAG, &os); 2869 if (error != 0) 2870 return (error); 2871 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2872 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2873 &numsnaps); 2874 dmu_objset_rele(os, FTAG); 2875 if (error != 0) 2876 return (error); 2877 2878 ddpa.ddpa_clonename = name; 2879 ddpa.err_ds = conflsnap; 2880 ddpa.cr = CRED(); 2881 2882 return (dsl_sync_task(name, dsl_dataset_promote_check, 2883 dsl_dataset_promote_sync, &ddpa, 2884 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2885} 2886 2887int 2888dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2889 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2890{ 2891 int64_t unused_refres_delta; 2892 2893 /* they should both be heads */ 2894 if (clone->ds_is_snapshot || 2895 origin_head->ds_is_snapshot) 2896 return (SET_ERROR(EINVAL)); 2897 2898 /* if we are not forcing, the branch point should be just before them */ 2899 if (!force && clone->ds_prev != origin_head->ds_prev) 2900 return (SET_ERROR(EINVAL)); 2901 2902 /* clone should be the clone (unless they are unrelated) */ 2903 if (clone->ds_prev != NULL && 2904 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2905 origin_head->ds_dir != clone->ds_prev->ds_dir) 2906 return (SET_ERROR(EINVAL)); 2907 2908 /* the clone should be a child of the origin */ 2909 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2910 return (SET_ERROR(EINVAL)); 2911 2912 /* origin_head shouldn't be modified unless 'force' */ 2913 if (!force && 2914 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2915 return (SET_ERROR(ETXTBSY)); 2916 2917 /* origin_head should have no long holds (e.g. is not mounted) */ 2918 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2919 return (SET_ERROR(EBUSY)); 2920 2921 /* check amount of any unconsumed refreservation */ 2922 unused_refres_delta = 2923 (int64_t)MIN(origin_head->ds_reserved, 2924 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2925 (int64_t)MIN(origin_head->ds_reserved, 2926 dsl_dataset_phys(clone)->ds_unique_bytes); 2927 2928 if (unused_refres_delta > 0 && 2929 unused_refres_delta > 2930 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2931 return (SET_ERROR(ENOSPC)); 2932 2933 /* clone can't be over the head's refquota */ 2934 if (origin_head->ds_quota != 0 && 2935 dsl_dataset_phys(clone)->ds_referenced_bytes > 2936 origin_head->ds_quota) 2937 return (SET_ERROR(EDQUOT)); 2938 2939 return (0); 2940} 2941 2942void 2943dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2944 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2945{ 2946 dsl_pool_t *dp = dmu_tx_pool(tx); 2947 int64_t unused_refres_delta; 2948 2949 ASSERT(clone->ds_reserved == 0); 2950 ASSERT(origin_head->ds_quota == 0 || 2951 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); 2952 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2953 2954 /* 2955 * Swap per-dataset feature flags. 2956 */ 2957 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2958 if (!(spa_feature_table[f].fi_flags & 2959 ZFEATURE_FLAG_PER_DATASET)) { 2960 ASSERT(!clone->ds_feature_inuse[f]); 2961 ASSERT(!origin_head->ds_feature_inuse[f]); 2962 continue; 2963 } 2964 2965 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 2966 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 2967 2968 if (clone_inuse) { 2969 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 2970 clone->ds_feature_inuse[f] = B_FALSE; 2971 } 2972 if (origin_head_inuse) { 2973 dsl_dataset_deactivate_feature(origin_head->ds_object, 2974 f, tx); 2975 origin_head->ds_feature_inuse[f] = B_FALSE; 2976 } 2977 if (clone_inuse) { 2978 dsl_dataset_activate_feature(origin_head->ds_object, 2979 f, tx); 2980 origin_head->ds_feature_inuse[f] = B_TRUE; 2981 } 2982 if (origin_head_inuse) { 2983 dsl_dataset_activate_feature(clone->ds_object, f, tx); 2984 clone->ds_feature_inuse[f] = B_TRUE; 2985 } 2986 } 2987 2988 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2989 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2990 2991 if (clone->ds_objset != NULL) { 2992 dmu_objset_evict(clone->ds_objset); 2993 clone->ds_objset = NULL; 2994 } 2995 2996 if (origin_head->ds_objset != NULL) { 2997 dmu_objset_evict(origin_head->ds_objset); 2998 origin_head->ds_objset = NULL; 2999 } 3000 3001 unused_refres_delta = 3002 (int64_t)MIN(origin_head->ds_reserved, 3003 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 3004 (int64_t)MIN(origin_head->ds_reserved, 3005 dsl_dataset_phys(clone)->ds_unique_bytes); 3006 3007 /* 3008 * Reset origin's unique bytes, if it exists. 3009 */ 3010 if (clone->ds_prev) { 3011 dsl_dataset_t *origin = clone->ds_prev; 3012 uint64_t comp, uncomp; 3013 3014 dmu_buf_will_dirty(origin->ds_dbuf, tx); 3015 dsl_deadlist_space_range(&clone->ds_deadlist, 3016 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 3017 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 3018 } 3019 3020 /* swap blkptrs */ 3021 { 3022 blkptr_t tmp; 3023 tmp = dsl_dataset_phys(origin_head)->ds_bp; 3024 dsl_dataset_phys(origin_head)->ds_bp = 3025 dsl_dataset_phys(clone)->ds_bp; 3026 dsl_dataset_phys(clone)->ds_bp = tmp; 3027 } 3028 3029 /* set dd_*_bytes */ 3030 { 3031 int64_t dused, dcomp, duncomp; 3032 uint64_t cdl_used, cdl_comp, cdl_uncomp; 3033 uint64_t odl_used, odl_comp, odl_uncomp; 3034 3035 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 3036 dd_used_breakdown[DD_USED_SNAP], ==, 0); 3037 3038 dsl_deadlist_space(&clone->ds_deadlist, 3039 &cdl_used, &cdl_comp, &cdl_uncomp); 3040 dsl_deadlist_space(&origin_head->ds_deadlist, 3041 &odl_used, &odl_comp, &odl_uncomp); 3042 3043 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 3044 cdl_used - 3045 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 3046 odl_used); 3047 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 3048 cdl_comp - 3049 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 3050 odl_comp); 3051 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 3052 cdl_uncomp - 3053 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 3054 odl_uncomp); 3055 3056 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 3057 dused, dcomp, duncomp, tx); 3058 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 3059 -dused, -dcomp, -duncomp, tx); 3060 3061 /* 3062 * The difference in the space used by snapshots is the 3063 * difference in snapshot space due to the head's 3064 * deadlist (since that's the only thing that's 3065 * changing that affects the snapused). 3066 */ 3067 dsl_deadlist_space_range(&clone->ds_deadlist, 3068 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3069 &cdl_used, &cdl_comp, &cdl_uncomp); 3070 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3071 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3072 &odl_used, &odl_comp, &odl_uncomp); 3073 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3074 DD_USED_HEAD, DD_USED_SNAP, NULL); 3075 } 3076 3077 /* swap ds_*_bytes */ 3078 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3079 dsl_dataset_phys(clone)->ds_referenced_bytes); 3080 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3081 dsl_dataset_phys(clone)->ds_compressed_bytes); 3082 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3083 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3084 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3085 dsl_dataset_phys(clone)->ds_unique_bytes); 3086 3087 /* apply any parent delta for change in unconsumed refreservation */ 3088 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3089 unused_refres_delta, 0, 0, tx); 3090 3091 /* 3092 * Swap deadlists. 3093 */ 3094 dsl_deadlist_close(&clone->ds_deadlist); 3095 dsl_deadlist_close(&origin_head->ds_deadlist); 3096 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3097 dsl_dataset_phys(clone)->ds_deadlist_obj); 3098 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3099 dsl_dataset_phys(clone)->ds_deadlist_obj); 3100 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3101 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3102 3103 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3104 3105 spa_history_log_internal_ds(clone, "clone swap", tx, 3106 "parent=%s", origin_head->ds_dir->dd_myname); 3107} 3108 3109/* 3110 * Given a pool name and a dataset object number in that pool, 3111 * return the name of that dataset. 3112 */ 3113int 3114dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3115{ 3116 dsl_pool_t *dp; 3117 dsl_dataset_t *ds; 3118 int error; 3119 3120 error = dsl_pool_hold(pname, FTAG, &dp); 3121 if (error != 0) 3122 return (error); 3123 3124 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3125 if (error == 0) { 3126 dsl_dataset_name(ds, buf); 3127 dsl_dataset_rele(ds, FTAG); 3128 } 3129 dsl_pool_rele(dp, FTAG); 3130 3131 return (error); 3132} 3133 3134int 3135dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3136 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3137{ 3138 int error = 0; 3139 3140 ASSERT3S(asize, >, 0); 3141 3142 /* 3143 * *ref_rsrv is the portion of asize that will come from any 3144 * unconsumed refreservation space. 3145 */ 3146 *ref_rsrv = 0; 3147 3148 mutex_enter(&ds->ds_lock); 3149 /* 3150 * Make a space adjustment for reserved bytes. 3151 */ 3152 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3153 ASSERT3U(*used, >=, 3154 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3155 *used -= 3156 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3157 *ref_rsrv = 3158 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3159 } 3160 3161 if (!check_quota || ds->ds_quota == 0) { 3162 mutex_exit(&ds->ds_lock); 3163 return (0); 3164 } 3165 /* 3166 * If they are requesting more space, and our current estimate 3167 * is over quota, they get to try again unless the actual 3168 * on-disk is over quota and there are no pending changes (which 3169 * may free up space for us). 3170 */ 3171 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3172 ds->ds_quota) { 3173 if (inflight > 0 || 3174 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3175 error = SET_ERROR(ERESTART); 3176 else 3177 error = SET_ERROR(EDQUOT); 3178 } 3179 mutex_exit(&ds->ds_lock); 3180 3181 return (error); 3182} 3183 3184typedef struct dsl_dataset_set_qr_arg { 3185 const char *ddsqra_name; 3186 zprop_source_t ddsqra_source; 3187 uint64_t ddsqra_value; 3188} dsl_dataset_set_qr_arg_t; 3189 3190 3191/* ARGSUSED */ 3192static int 3193dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3194{ 3195 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3196 dsl_pool_t *dp = dmu_tx_pool(tx); 3197 dsl_dataset_t *ds; 3198 int error; 3199 uint64_t newval; 3200 3201 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3202 return (SET_ERROR(ENOTSUP)); 3203 3204 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3205 if (error != 0) 3206 return (error); 3207 3208 if (ds->ds_is_snapshot) { 3209 dsl_dataset_rele(ds, FTAG); 3210 return (SET_ERROR(EINVAL)); 3211 } 3212 3213 error = dsl_prop_predict(ds->ds_dir, 3214 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3215 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3216 if (error != 0) { 3217 dsl_dataset_rele(ds, FTAG); 3218 return (error); 3219 } 3220 3221 if (newval == 0) { 3222 dsl_dataset_rele(ds, FTAG); 3223 return (0); 3224 } 3225 3226 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3227 newval < ds->ds_reserved) { 3228 dsl_dataset_rele(ds, FTAG); 3229 return (SET_ERROR(ENOSPC)); 3230 } 3231 3232 dsl_dataset_rele(ds, FTAG); 3233 return (0); 3234} 3235 3236static void 3237dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3238{ 3239 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3240 dsl_pool_t *dp = dmu_tx_pool(tx); 3241 dsl_dataset_t *ds; 3242 uint64_t newval; 3243 3244 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3245 3246 dsl_prop_set_sync_impl(ds, 3247 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3248 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3249 &ddsqra->ddsqra_value, tx); 3250 3251 VERIFY0(dsl_prop_get_int_ds(ds, 3252 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3253 3254 if (ds->ds_quota != newval) { 3255 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3256 ds->ds_quota = newval; 3257 } 3258 dsl_dataset_rele(ds, FTAG); 3259} 3260 3261int 3262dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3263 uint64_t refquota) 3264{ 3265 dsl_dataset_set_qr_arg_t ddsqra; 3266 3267 ddsqra.ddsqra_name = dsname; 3268 ddsqra.ddsqra_source = source; 3269 ddsqra.ddsqra_value = refquota; 3270 3271 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3272 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3273} 3274 3275static int 3276dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3277{ 3278 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3279 dsl_pool_t *dp = dmu_tx_pool(tx); 3280 dsl_dataset_t *ds; 3281 int error; 3282 uint64_t newval, unique; 3283 3284 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3285 return (SET_ERROR(ENOTSUP)); 3286 3287 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3288 if (error != 0) 3289 return (error); 3290 3291 if (ds->ds_is_snapshot) { 3292 dsl_dataset_rele(ds, FTAG); 3293 return (SET_ERROR(EINVAL)); 3294 } 3295 3296 error = dsl_prop_predict(ds->ds_dir, 3297 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3298 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3299 if (error != 0) { 3300 dsl_dataset_rele(ds, FTAG); 3301 return (error); 3302 } 3303 3304 /* 3305 * If we are doing the preliminary check in open context, the 3306 * space estimates may be inaccurate. 3307 */ 3308 if (!dmu_tx_is_syncing(tx)) { 3309 dsl_dataset_rele(ds, FTAG); 3310 return (0); 3311 } 3312 3313 mutex_enter(&ds->ds_lock); 3314 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3315 dsl_dataset_recalc_head_uniq(ds); 3316 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3317 mutex_exit(&ds->ds_lock); 3318 3319 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3320 uint64_t delta = MAX(unique, newval) - 3321 MAX(unique, ds->ds_reserved); 3322 3323 if (delta > 3324 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3325 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3326 dsl_dataset_rele(ds, FTAG); 3327 return (SET_ERROR(ENOSPC)); 3328 } 3329 } 3330 3331 dsl_dataset_rele(ds, FTAG); 3332 return (0); 3333} 3334 3335void 3336dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3337 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3338{ 3339 uint64_t newval; 3340 uint64_t unique; 3341 int64_t delta; 3342 3343 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3344 source, sizeof (value), 1, &value, tx); 3345 3346 VERIFY0(dsl_prop_get_int_ds(ds, 3347 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3348 3349 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3350 mutex_enter(&ds->ds_dir->dd_lock); 3351 mutex_enter(&ds->ds_lock); 3352 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3353 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3354 delta = MAX(0, (int64_t)(newval - unique)) - 3355 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3356 ds->ds_reserved = newval; 3357 mutex_exit(&ds->ds_lock); 3358 3359 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3360 mutex_exit(&ds->ds_dir->dd_lock); 3361} 3362 3363static void 3364dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3365{ 3366 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3367 dsl_pool_t *dp = dmu_tx_pool(tx); 3368 dsl_dataset_t *ds; 3369 3370 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3371 dsl_dataset_set_refreservation_sync_impl(ds, 3372 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3373 dsl_dataset_rele(ds, FTAG); 3374} 3375 3376int 3377dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3378 uint64_t refreservation) 3379{ 3380 dsl_dataset_set_qr_arg_t ddsqra; 3381 3382 ddsqra.ddsqra_name = dsname; 3383 ddsqra.ddsqra_source = source; 3384 ddsqra.ddsqra_value = refreservation; 3385 3386 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3387 dsl_dataset_set_refreservation_sync, &ddsqra, 3388 0, ZFS_SPACE_CHECK_NONE)); 3389} 3390 3391/* 3392 * Return (in *usedp) the amount of space written in new that is not 3393 * present in oldsnap. New may be a snapshot or the head. Old must be 3394 * a snapshot before new, in new's filesystem (or its origin). If not then 3395 * fail and return EINVAL. 3396 * 3397 * The written space is calculated by considering two components: First, we 3398 * ignore any freed space, and calculate the written as new's used space 3399 * minus old's used space. Next, we add in the amount of space that was freed 3400 * between the two snapshots, thus reducing new's used space relative to old's. 3401 * Specifically, this is the space that was born before old->ds_creation_txg, 3402 * and freed before new (ie. on new's deadlist or a previous deadlist). 3403 * 3404 * space freed [---------------------] 3405 * snapshots ---O-------O--------O-------O------ 3406 * oldsnap new 3407 */ 3408int 3409dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3410 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3411{ 3412 int err = 0; 3413 uint64_t snapobj; 3414 dsl_pool_t *dp = new->ds_dir->dd_pool; 3415 3416 ASSERT(dsl_pool_config_held(dp)); 3417 3418 *usedp = 0; 3419 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3420 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3421 3422 *compp = 0; 3423 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3424 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3425 3426 *uncompp = 0; 3427 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3428 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3429 3430 snapobj = new->ds_object; 3431 while (snapobj != oldsnap->ds_object) { 3432 dsl_dataset_t *snap; 3433 uint64_t used, comp, uncomp; 3434 3435 if (snapobj == new->ds_object) { 3436 snap = new; 3437 } else { 3438 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3439 if (err != 0) 3440 break; 3441 } 3442 3443 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3444 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3445 /* 3446 * The blocks in the deadlist can not be born after 3447 * ds_prev_snap_txg, so get the whole deadlist space, 3448 * which is more efficient (especially for old-format 3449 * deadlists). Unfortunately the deadlist code 3450 * doesn't have enough information to make this 3451 * optimization itself. 3452 */ 3453 dsl_deadlist_space(&snap->ds_deadlist, 3454 &used, &comp, &uncomp); 3455 } else { 3456 dsl_deadlist_space_range(&snap->ds_deadlist, 3457 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3458 &used, &comp, &uncomp); 3459 } 3460 *usedp += used; 3461 *compp += comp; 3462 *uncompp += uncomp; 3463 3464 /* 3465 * If we get to the beginning of the chain of snapshots 3466 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3467 * was not a snapshot of/before new. 3468 */ 3469 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3470 if (snap != new) 3471 dsl_dataset_rele(snap, FTAG); 3472 if (snapobj == 0) { 3473 err = SET_ERROR(EINVAL); 3474 break; 3475 } 3476 3477 } 3478 return (err); 3479} 3480 3481/* 3482 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3483 * lastsnap, and all snapshots in between are deleted. 3484 * 3485 * blocks that would be freed [---------------------------] 3486 * snapshots ---O-------O--------O-------O--------O 3487 * firstsnap lastsnap 3488 * 3489 * This is the set of blocks that were born after the snap before firstsnap, 3490 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3491 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3492 * We calculate this by iterating over the relevant deadlists (from the snap 3493 * after lastsnap, backward to the snap after firstsnap), summing up the 3494 * space on the deadlist that was born after the snap before firstsnap. 3495 */ 3496int 3497dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3498 dsl_dataset_t *lastsnap, 3499 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3500{ 3501 int err = 0; 3502 uint64_t snapobj; 3503 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3504 3505 ASSERT(firstsnap->ds_is_snapshot); 3506 ASSERT(lastsnap->ds_is_snapshot); 3507 3508 /* 3509 * Check that the snapshots are in the same dsl_dir, and firstsnap 3510 * is before lastsnap. 3511 */ 3512 if (firstsnap->ds_dir != lastsnap->ds_dir || 3513 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3514 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3515 return (SET_ERROR(EINVAL)); 3516 3517 *usedp = *compp = *uncompp = 0; 3518 3519 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3520 while (snapobj != firstsnap->ds_object) { 3521 dsl_dataset_t *ds; 3522 uint64_t used, comp, uncomp; 3523 3524 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3525 if (err != 0) 3526 break; 3527 3528 dsl_deadlist_space_range(&ds->ds_deadlist, 3529 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3530 &used, &comp, &uncomp); 3531 *usedp += used; 3532 *compp += comp; 3533 *uncompp += uncomp; 3534 3535 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3536 ASSERT3U(snapobj, !=, 0); 3537 dsl_dataset_rele(ds, FTAG); 3538 } 3539 return (err); 3540} 3541 3542/* 3543 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3544 * For example, they could both be snapshots of the same filesystem, and 3545 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3546 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3547 * filesystem. Or 'earlier' could be the origin's origin. 3548 * 3549 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3550 */ 3551boolean_t 3552dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3553 uint64_t earlier_txg) 3554{ 3555 dsl_pool_t *dp = later->ds_dir->dd_pool; 3556 int error; 3557 boolean_t ret; 3558 3559 ASSERT(dsl_pool_config_held(dp)); 3560 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3561 3562 if (earlier_txg == 0) 3563 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3564 3565 if (later->ds_is_snapshot && 3566 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3567 return (B_FALSE); 3568 3569 if (later->ds_dir == earlier->ds_dir) 3570 return (B_TRUE); 3571 if (!dsl_dir_is_clone(later->ds_dir)) 3572 return (B_FALSE); 3573 3574 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3575 return (B_TRUE); 3576 dsl_dataset_t *origin; 3577 error = dsl_dataset_hold_obj(dp, 3578 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3579 if (error != 0) 3580 return (B_FALSE); 3581 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3582 dsl_dataset_rele(origin, FTAG); 3583 return (ret); 3584} 3585 3586void 3587dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3588{ 3589 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3590 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3591} 3592 3593boolean_t 3594dsl_dataset_is_zapified(dsl_dataset_t *ds) 3595{ 3596 dmu_object_info_t doi; 3597 3598 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3599 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3600} 3601 3602boolean_t 3603dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3604{ 3605 return (dsl_dataset_is_zapified(ds) && 3606 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3607 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3608} 3609