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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/dmu_objset.h> 29 #include <sys/dsl_dataset.h> 30 #include <sys/dsl_dir.h> 31 #include <sys/dsl_prop.h> 32 #include <sys/dsl_synctask.h> 33 #include <sys/dmu_traverse.h> 34 #include <sys/dmu_tx.h> 35 #include <sys/arc.h> 36 #include <sys/zio.h> 37 #include <sys/zap.h> 38 #include <sys/unique.h> 39 #include <sys/zfs_context.h> 40 #include <sys/zfs_ioctl.h> 41 #include <sys/spa.h> 42 #include <sys/zfs_znode.h> 43 #include <sys/sunddi.h> 44 45 static char *dsl_reaper = "the grim reaper"; 46 47 static dsl_checkfunc_t dsl_dataset_destroy_begin_check; 48 static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; 49 static dsl_checkfunc_t dsl_dataset_rollback_check; 50 static dsl_syncfunc_t dsl_dataset_rollback_sync; 51 static dsl_syncfunc_t dsl_dataset_set_reservation_sync; 52 53 #define DS_REF_MAX (1ULL << 62) 54 55 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 56 57 #define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper) 58 59 60 /* 61 * Figure out how much of this delta should be propogated to the dsl_dir 62 * layer. If there's a refreservation, that space has already been 63 * partially accounted for in our ancestors. 64 */ 65 static int64_t 66 parent_delta(dsl_dataset_t *ds, int64_t delta) 67 { 68 uint64_t old_bytes, new_bytes; 69 70 if (ds->ds_reserved == 0) 71 return (delta); 72 73 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 74 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 75 76 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 77 return (new_bytes - old_bytes); 78 } 79 80 void 81 dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 82 { 83 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 84 int compressed = BP_GET_PSIZE(bp); 85 int uncompressed = BP_GET_UCSIZE(bp); 86 int64_t delta; 87 88 dprintf_bp(bp, "born, ds=%p\n", ds); 89 90 ASSERT(dmu_tx_is_syncing(tx)); 91 /* It could have been compressed away to nothing */ 92 if (BP_IS_HOLE(bp)) 93 return; 94 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 95 ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); 96 if (ds == NULL) { 97 /* 98 * Account for the meta-objset space in its placeholder 99 * dsl_dir. 100 */ 101 ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ 102 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 103 used, compressed, uncompressed, tx); 104 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 105 return; 106 } 107 dmu_buf_will_dirty(ds->ds_dbuf, tx); 108 mutex_enter(&ds->ds_lock); 109 delta = parent_delta(ds, used); 110 ds->ds_phys->ds_used_bytes += used; 111 ds->ds_phys->ds_compressed_bytes += compressed; 112 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 113 ds->ds_phys->ds_unique_bytes += used; 114 mutex_exit(&ds->ds_lock); 115 dsl_dir_diduse_space(ds->ds_dir, delta, compressed, uncompressed, tx); 116 } 117 118 int 119 dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, 120 dmu_tx_t *tx) 121 { 122 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 123 int compressed = BP_GET_PSIZE(bp); 124 int uncompressed = BP_GET_UCSIZE(bp); 125 126 ASSERT(dmu_tx_is_syncing(tx)); 127 /* No block pointer => nothing to free */ 128 if (BP_IS_HOLE(bp)) 129 return (0); 130 131 ASSERT(used > 0); 132 if (ds == NULL) { 133 int err; 134 /* 135 * Account for the meta-objset space in its placeholder 136 * dataset. 137 */ 138 err = dsl_free(pio, tx->tx_pool, 139 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); 140 ASSERT(err == 0); 141 142 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 143 -used, -compressed, -uncompressed, tx); 144 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 145 return (used); 146 } 147 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 148 149 dmu_buf_will_dirty(ds->ds_dbuf, tx); 150 151 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 152 int err; 153 int64_t delta; 154 155 dprintf_bp(bp, "freeing: %s", ""); 156 err = dsl_free(pio, tx->tx_pool, 157 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); 158 ASSERT(err == 0); 159 160 mutex_enter(&ds->ds_lock); 161 ASSERT(ds->ds_phys->ds_unique_bytes >= used || 162 !DS_UNIQUE_IS_ACCURATE(ds)); 163 delta = parent_delta(ds, -used); 164 ds->ds_phys->ds_unique_bytes -= used; 165 mutex_exit(&ds->ds_lock); 166 dsl_dir_diduse_space(ds->ds_dir, 167 delta, -compressed, -uncompressed, tx); 168 } else { 169 dprintf_bp(bp, "putting on dead list: %s", ""); 170 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); 171 ASSERT3U(ds->ds_prev->ds_object, ==, 172 ds->ds_phys->ds_prev_snap_obj); 173 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 174 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 175 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 176 ds->ds_object && bp->blk_birth > 177 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 178 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 179 mutex_enter(&ds->ds_prev->ds_lock); 180 ds->ds_prev->ds_phys->ds_unique_bytes += used; 181 mutex_exit(&ds->ds_prev->ds_lock); 182 } 183 } 184 mutex_enter(&ds->ds_lock); 185 ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); 186 ds->ds_phys->ds_used_bytes -= used; 187 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 188 ds->ds_phys->ds_compressed_bytes -= compressed; 189 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 190 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 191 mutex_exit(&ds->ds_lock); 192 193 return (used); 194 } 195 196 uint64_t 197 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 198 { 199 uint64_t trysnap = 0; 200 201 if (ds == NULL) 202 return (0); 203 /* 204 * The snapshot creation could fail, but that would cause an 205 * incorrect FALSE return, which would only result in an 206 * overestimation of the amount of space that an operation would 207 * consume, which is OK. 208 * 209 * There's also a small window where we could miss a pending 210 * snapshot, because we could set the sync task in the quiescing 211 * phase. So this should only be used as a guess. 212 */ 213 if (ds->ds_trysnap_txg > 214 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 215 trysnap = ds->ds_trysnap_txg; 216 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 217 } 218 219 int 220 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) 221 { 222 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); 223 } 224 225 /* ARGSUSED */ 226 static void 227 dsl_dataset_evict(dmu_buf_t *db, void *dsv) 228 { 229 dsl_dataset_t *ds = dsv; 230 231 ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds)); 232 233 dprintf_ds(ds, "evicting %s\n", ""); 234 235 unique_remove(ds->ds_fsid_guid); 236 237 if (ds->ds_user_ptr != NULL) 238 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 239 240 if (ds->ds_prev) { 241 dsl_dataset_drop_ref(ds->ds_prev, ds); 242 ds->ds_prev = NULL; 243 } 244 245 bplist_close(&ds->ds_deadlist); 246 if (ds->ds_dir) 247 dsl_dir_close(ds->ds_dir, ds); 248 249 ASSERT(!list_link_active(&ds->ds_synced_link)); 250 251 mutex_destroy(&ds->ds_lock); 252 mutex_destroy(&ds->ds_opening_lock); 253 mutex_destroy(&ds->ds_deadlist.bpl_lock); 254 rw_destroy(&ds->ds_rwlock); 255 cv_destroy(&ds->ds_exclusive_cv); 256 257 kmem_free(ds, sizeof (dsl_dataset_t)); 258 } 259 260 static int 261 dsl_dataset_get_snapname(dsl_dataset_t *ds) 262 { 263 dsl_dataset_phys_t *headphys; 264 int err; 265 dmu_buf_t *headdbuf; 266 dsl_pool_t *dp = ds->ds_dir->dd_pool; 267 objset_t *mos = dp->dp_meta_objset; 268 269 if (ds->ds_snapname[0]) 270 return (0); 271 if (ds->ds_phys->ds_next_snap_obj == 0) 272 return (0); 273 274 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 275 FTAG, &headdbuf); 276 if (err) 277 return (err); 278 headphys = headdbuf->db_data; 279 err = zap_value_search(dp->dp_meta_objset, 280 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 281 dmu_buf_rele(headdbuf, FTAG); 282 return (err); 283 } 284 285 static int 286 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 287 { 288 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 289 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 290 matchtype_t mt; 291 int err; 292 293 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 294 mt = MT_FIRST; 295 else 296 mt = MT_EXACT; 297 298 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 299 value, mt, NULL, 0, NULL); 300 if (err == ENOTSUP && mt == MT_FIRST) 301 err = zap_lookup(mos, snapobj, name, 8, 1, value); 302 return (err); 303 } 304 305 static int 306 dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx) 307 { 308 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 309 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 310 matchtype_t mt; 311 int err; 312 313 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 314 mt = MT_FIRST; 315 else 316 mt = MT_EXACT; 317 318 err = zap_remove_norm(mos, snapobj, name, mt, tx); 319 if (err == ENOTSUP && mt == MT_FIRST) 320 err = zap_remove(mos, snapobj, name, tx); 321 return (err); 322 } 323 324 static int 325 dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, void *tag, 326 dsl_dataset_t **dsp) 327 { 328 objset_t *mos = dp->dp_meta_objset; 329 dmu_buf_t *dbuf; 330 dsl_dataset_t *ds; 331 int err; 332 333 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 334 dsl_pool_sync_context(dp)); 335 336 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 337 if (err) 338 return (err); 339 ds = dmu_buf_get_user(dbuf); 340 if (ds == NULL) { 341 dsl_dataset_t *winner; 342 343 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 344 ds->ds_dbuf = dbuf; 345 ds->ds_object = dsobj; 346 ds->ds_phys = dbuf->db_data; 347 348 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 349 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 350 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, 351 NULL); 352 rw_init(&ds->ds_rwlock, 0, 0, 0); 353 cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL); 354 355 err = bplist_open(&ds->ds_deadlist, 356 mos, ds->ds_phys->ds_deadlist_obj); 357 if (err == 0) { 358 err = dsl_dir_open_obj(dp, 359 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 360 } 361 if (err) { 362 /* 363 * we don't really need to close the blist if we 364 * just opened it. 365 */ 366 mutex_destroy(&ds->ds_lock); 367 mutex_destroy(&ds->ds_opening_lock); 368 mutex_destroy(&ds->ds_deadlist.bpl_lock); 369 rw_destroy(&ds->ds_rwlock); 370 cv_destroy(&ds->ds_exclusive_cv); 371 kmem_free(ds, sizeof (dsl_dataset_t)); 372 dmu_buf_rele(dbuf, tag); 373 return (err); 374 } 375 376 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { 377 ds->ds_snapname[0] = '\0'; 378 if (ds->ds_phys->ds_prev_snap_obj) { 379 err = dsl_dataset_get_ref(dp, 380 ds->ds_phys->ds_prev_snap_obj, 381 ds, &ds->ds_prev); 382 } 383 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { 384 err = dsl_dataset_get_snapname(ds); 385 } 386 387 if (!dsl_dataset_is_snapshot(ds)) { 388 /* 389 * In sync context, we're called with either no lock 390 * or with the write lock. If we're not syncing, 391 * we're always called with the read lock held. 392 */ 393 boolean_t need_lock = 394 !RW_WRITE_HELD(&dp->dp_config_rwlock) && 395 dsl_pool_sync_context(dp); 396 397 if (need_lock) 398 rw_enter(&dp->dp_config_rwlock, RW_READER); 399 400 err = dsl_prop_get_ds(ds, 401 "refreservation", sizeof (uint64_t), 1, 402 &ds->ds_reserved, NULL); 403 if (err == 0) { 404 err = dsl_prop_get_ds(ds, 405 "refquota", sizeof (uint64_t), 1, 406 &ds->ds_quota, NULL); 407 } 408 409 if (need_lock) 410 rw_exit(&dp->dp_config_rwlock); 411 } else { 412 ds->ds_reserved = ds->ds_quota = 0; 413 } 414 415 if (err == 0) { 416 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, 417 dsl_dataset_evict); 418 } 419 if (err || winner) { 420 bplist_close(&ds->ds_deadlist); 421 if (ds->ds_prev) 422 dsl_dataset_drop_ref(ds->ds_prev, ds); 423 dsl_dir_close(ds->ds_dir, ds); 424 mutex_destroy(&ds->ds_lock); 425 mutex_destroy(&ds->ds_opening_lock); 426 mutex_destroy(&ds->ds_deadlist.bpl_lock); 427 rw_destroy(&ds->ds_rwlock); 428 cv_destroy(&ds->ds_exclusive_cv); 429 kmem_free(ds, sizeof (dsl_dataset_t)); 430 if (err) { 431 dmu_buf_rele(dbuf, tag); 432 return (err); 433 } 434 ds = winner; 435 } else { 436 ds->ds_fsid_guid = 437 unique_insert(ds->ds_phys->ds_fsid_guid); 438 } 439 } 440 ASSERT3P(ds->ds_dbuf, ==, dbuf); 441 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 442 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || 443 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 444 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 445 mutex_enter(&ds->ds_lock); 446 if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) { 447 mutex_exit(&ds->ds_lock); 448 dmu_buf_rele(ds->ds_dbuf, tag); 449 return (ENOENT); 450 } 451 mutex_exit(&ds->ds_lock); 452 *dsp = ds; 453 return (0); 454 } 455 456 static int 457 dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag) 458 { 459 dsl_pool_t *dp = ds->ds_dir->dd_pool; 460 461 /* 462 * In syncing context we don't want the rwlock lock: there 463 * may be an existing writer waiting for sync phase to 464 * finish. We don't need to worry about such writers, since 465 * sync phase is single-threaded, so the writer can't be 466 * doing anything while we are active. 467 */ 468 if (dsl_pool_sync_context(dp)) { 469 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 470 return (0); 471 } 472 473 /* 474 * Normal users will hold the ds_rwlock as a READER until they 475 * are finished (i.e., call dsl_dataset_rele()). "Owners" will 476 * drop their READER lock after they set the ds_owner field. 477 * 478 * If the dataset is being destroyed, the destroy thread will 479 * obtain a WRITER lock for exclusive access after it's done its 480 * open-context work and then change the ds_owner to 481 * dsl_reaper once destruction is assured. So threads 482 * may block here temporarily, until the "destructability" of 483 * the dataset is determined. 484 */ 485 ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock)); 486 mutex_enter(&ds->ds_lock); 487 while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) { 488 rw_exit(&dp->dp_config_rwlock); 489 cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock); 490 if (DSL_DATASET_IS_DESTROYED(ds)) { 491 mutex_exit(&ds->ds_lock); 492 dsl_dataset_drop_ref(ds, tag); 493 rw_enter(&dp->dp_config_rwlock, RW_READER); 494 return (ENOENT); 495 } 496 rw_enter(&dp->dp_config_rwlock, RW_READER); 497 } 498 mutex_exit(&ds->ds_lock); 499 return (0); 500 } 501 502 int 503 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 504 dsl_dataset_t **dsp) 505 { 506 int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp); 507 508 if (err) 509 return (err); 510 return (dsl_dataset_hold_ref(*dsp, tag)); 511 } 512 513 int 514 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, int flags, void *owner, 515 dsl_dataset_t **dsp) 516 { 517 int err = dsl_dataset_hold_obj(dp, dsobj, owner, dsp); 518 519 ASSERT(DS_MODE_TYPE(flags) != DS_MODE_USER); 520 521 if (err) 522 return (err); 523 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 524 dsl_dataset_rele(*dsp, owner); 525 return (EBUSY); 526 } 527 return (0); 528 } 529 530 int 531 dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp) 532 { 533 dsl_dir_t *dd; 534 dsl_pool_t *dp; 535 const char *snapname; 536 uint64_t obj; 537 int err = 0; 538 539 err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname); 540 if (err) 541 return (err); 542 543 dp = dd->dd_pool; 544 obj = dd->dd_phys->dd_head_dataset_obj; 545 rw_enter(&dp->dp_config_rwlock, RW_READER); 546 if (obj) 547 err = dsl_dataset_get_ref(dp, obj, tag, dsp); 548 else 549 err = ENOENT; 550 if (err) 551 goto out; 552 553 err = dsl_dataset_hold_ref(*dsp, tag); 554 555 /* we may be looking for a snapshot */ 556 if (err == 0 && snapname != NULL) { 557 dsl_dataset_t *ds = NULL; 558 559 if (*snapname++ != '@') { 560 dsl_dataset_rele(*dsp, tag); 561 err = ENOENT; 562 goto out; 563 } 564 565 dprintf("looking for snapshot '%s'\n", snapname); 566 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 567 if (err == 0) 568 err = dsl_dataset_get_ref(dp, obj, tag, &ds); 569 dsl_dataset_rele(*dsp, tag); 570 571 ASSERT3U((err == 0), ==, (ds != NULL)); 572 573 if (ds) { 574 mutex_enter(&ds->ds_lock); 575 if (ds->ds_snapname[0] == 0) 576 (void) strlcpy(ds->ds_snapname, snapname, 577 sizeof (ds->ds_snapname)); 578 mutex_exit(&ds->ds_lock); 579 err = dsl_dataset_hold_ref(ds, tag); 580 *dsp = err ? NULL : ds; 581 } 582 } 583 out: 584 rw_exit(&dp->dp_config_rwlock); 585 dsl_dir_close(dd, FTAG); 586 return (err); 587 } 588 589 int 590 dsl_dataset_own(const char *name, int flags, void *owner, dsl_dataset_t **dsp) 591 { 592 int err = dsl_dataset_hold(name, owner, dsp); 593 if (err) 594 return (err); 595 if ((*dsp)->ds_phys->ds_num_children > 0 && 596 !DS_MODE_IS_READONLY(flags)) { 597 dsl_dataset_rele(*dsp, owner); 598 return (EROFS); 599 } 600 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 601 dsl_dataset_rele(*dsp, owner); 602 return (EBUSY); 603 } 604 return (0); 605 } 606 607 void 608 dsl_dataset_name(dsl_dataset_t *ds, char *name) 609 { 610 if (ds == NULL) { 611 (void) strcpy(name, "mos"); 612 } else { 613 dsl_dir_name(ds->ds_dir, name); 614 VERIFY(0 == dsl_dataset_get_snapname(ds)); 615 if (ds->ds_snapname[0]) { 616 (void) strcat(name, "@"); 617 /* 618 * We use a "recursive" mutex so that we 619 * can call dprintf_ds() with ds_lock held. 620 */ 621 if (!MUTEX_HELD(&ds->ds_lock)) { 622 mutex_enter(&ds->ds_lock); 623 (void) strcat(name, ds->ds_snapname); 624 mutex_exit(&ds->ds_lock); 625 } else { 626 (void) strcat(name, ds->ds_snapname); 627 } 628 } 629 } 630 } 631 632 static int 633 dsl_dataset_namelen(dsl_dataset_t *ds) 634 { 635 int result; 636 637 if (ds == NULL) { 638 result = 3; /* "mos" */ 639 } else { 640 result = dsl_dir_namelen(ds->ds_dir); 641 VERIFY(0 == dsl_dataset_get_snapname(ds)); 642 if (ds->ds_snapname[0]) { 643 ++result; /* adding one for the @-sign */ 644 if (!MUTEX_HELD(&ds->ds_lock)) { 645 mutex_enter(&ds->ds_lock); 646 result += strlen(ds->ds_snapname); 647 mutex_exit(&ds->ds_lock); 648 } else { 649 result += strlen(ds->ds_snapname); 650 } 651 } 652 } 653 654 return (result); 655 } 656 657 void 658 dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag) 659 { 660 dmu_buf_rele(ds->ds_dbuf, tag); 661 } 662 663 void 664 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 665 { 666 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) { 667 rw_exit(&ds->ds_rwlock); 668 } 669 dsl_dataset_drop_ref(ds, tag); 670 } 671 672 void 673 dsl_dataset_disown(dsl_dataset_t *ds, void *owner) 674 { 675 ASSERT((ds->ds_owner == owner && ds->ds_dbuf) || 676 (DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL)); 677 678 mutex_enter(&ds->ds_lock); 679 ds->ds_owner = NULL; 680 if (RW_WRITE_HELD(&ds->ds_rwlock)) { 681 rw_exit(&ds->ds_rwlock); 682 cv_broadcast(&ds->ds_exclusive_cv); 683 } 684 mutex_exit(&ds->ds_lock); 685 if (ds->ds_dbuf) 686 dsl_dataset_drop_ref(ds, owner); 687 else 688 dsl_dataset_evict(ds->ds_dbuf, ds); 689 } 690 691 boolean_t 692 dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *owner) 693 { 694 boolean_t gotit = FALSE; 695 696 mutex_enter(&ds->ds_lock); 697 if (ds->ds_owner == NULL && 698 (!DS_IS_INCONSISTENT(ds) || inconsistentok)) { 699 ds->ds_owner = owner; 700 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) 701 rw_exit(&ds->ds_rwlock); 702 gotit = TRUE; 703 } 704 mutex_exit(&ds->ds_lock); 705 return (gotit); 706 } 707 708 void 709 dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner) 710 { 711 ASSERT3P(owner, ==, ds->ds_owner); 712 if (!RW_WRITE_HELD(&ds->ds_rwlock)) 713 rw_enter(&ds->ds_rwlock, RW_WRITER); 714 } 715 716 uint64_t 717 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 718 uint64_t flags, dmu_tx_t *tx) 719 { 720 dsl_pool_t *dp = dd->dd_pool; 721 dmu_buf_t *dbuf; 722 dsl_dataset_phys_t *dsphys; 723 uint64_t dsobj; 724 objset_t *mos = dp->dp_meta_objset; 725 726 if (origin == NULL) 727 origin = dp->dp_origin_snap; 728 729 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 730 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 731 ASSERT(dmu_tx_is_syncing(tx)); 732 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 733 734 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 735 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 736 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 737 dmu_buf_will_dirty(dbuf, tx); 738 dsphys = dbuf->db_data; 739 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 740 dsphys->ds_dir_obj = dd->dd_object; 741 dsphys->ds_flags = flags; 742 dsphys->ds_fsid_guid = unique_create(); 743 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 744 sizeof (dsphys->ds_guid)); 745 dsphys->ds_snapnames_zapobj = 746 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 747 DMU_OT_NONE, 0, tx); 748 dsphys->ds_creation_time = gethrestime_sec(); 749 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 750 dsphys->ds_deadlist_obj = 751 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 752 753 if (origin) { 754 dsphys->ds_prev_snap_obj = origin->ds_object; 755 dsphys->ds_prev_snap_txg = 756 origin->ds_phys->ds_creation_txg; 757 dsphys->ds_used_bytes = 758 origin->ds_phys->ds_used_bytes; 759 dsphys->ds_compressed_bytes = 760 origin->ds_phys->ds_compressed_bytes; 761 dsphys->ds_uncompressed_bytes = 762 origin->ds_phys->ds_uncompressed_bytes; 763 dsphys->ds_bp = origin->ds_phys->ds_bp; 764 dsphys->ds_flags |= origin->ds_phys->ds_flags; 765 766 dmu_buf_will_dirty(origin->ds_dbuf, tx); 767 origin->ds_phys->ds_num_children++; 768 769 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 770 if (origin->ds_phys->ds_next_clones_obj == 0) { 771 origin->ds_phys->ds_next_clones_obj = 772 zap_create(mos, 773 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 774 } 775 VERIFY(0 == zap_add_int(mos, 776 origin->ds_phys->ds_next_clones_obj, 777 dsobj, tx)); 778 } 779 780 dmu_buf_will_dirty(dd->dd_dbuf, tx); 781 dd->dd_phys->dd_origin_obj = origin->ds_object; 782 } 783 784 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 785 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 786 787 dmu_buf_rele(dbuf, FTAG); 788 789 dmu_buf_will_dirty(dd->dd_dbuf, tx); 790 dd->dd_phys->dd_head_dataset_obj = dsobj; 791 792 return (dsobj); 793 } 794 795 uint64_t 796 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 797 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 798 { 799 dsl_pool_t *dp = pdd->dd_pool; 800 uint64_t dsobj, ddobj; 801 dsl_dir_t *dd; 802 803 ASSERT(lastname[0] != '@'); 804 805 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 806 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); 807 808 dsobj = dsl_dataset_create_sync_dd(dd, origin, flags, tx); 809 810 dsl_deleg_set_create_perms(dd, tx, cr); 811 812 dsl_dir_close(dd, FTAG); 813 814 return (dsobj); 815 } 816 817 struct destroyarg { 818 dsl_sync_task_group_t *dstg; 819 char *snapname; 820 char *failed; 821 }; 822 823 static int 824 dsl_snapshot_destroy_one(char *name, void *arg) 825 { 826 struct destroyarg *da = arg; 827 dsl_dataset_t *ds; 828 char *cp; 829 int err; 830 831 (void) strcat(name, "@"); 832 (void) strcat(name, da->snapname); 833 err = dsl_dataset_own(name, DS_MODE_READONLY | DS_MODE_INCONSISTENT, 834 da->dstg, &ds); 835 cp = strchr(name, '@'); 836 *cp = '\0'; 837 if (err == 0) { 838 dsl_dataset_make_exclusive(ds, da->dstg); 839 if (ds->ds_user_ptr) { 840 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 841 ds->ds_user_ptr = NULL; 842 } 843 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, 844 dsl_dataset_destroy_sync, ds, da->dstg, 0); 845 } else if (err == ENOENT) { 846 err = 0; 847 } else { 848 (void) strcpy(da->failed, name); 849 } 850 return (err); 851 } 852 853 /* 854 * Destroy 'snapname' in all descendants of 'fsname'. 855 */ 856 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy 857 int 858 dsl_snapshots_destroy(char *fsname, char *snapname) 859 { 860 int err; 861 struct destroyarg da; 862 dsl_sync_task_t *dst; 863 spa_t *spa; 864 865 err = spa_open(fsname, &spa, FTAG); 866 if (err) 867 return (err); 868 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 869 da.snapname = snapname; 870 da.failed = fsname; 871 872 err = dmu_objset_find(fsname, 873 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); 874 875 if (err == 0) 876 err = dsl_sync_task_group_wait(da.dstg); 877 878 for (dst = list_head(&da.dstg->dstg_tasks); dst; 879 dst = list_next(&da.dstg->dstg_tasks, dst)) { 880 dsl_dataset_t *ds = dst->dst_arg1; 881 /* 882 * Return the file system name that triggered the error 883 */ 884 if (dst->dst_err) { 885 dsl_dataset_name(ds, fsname); 886 *strchr(fsname, '@') = '\0'; 887 } 888 dsl_dataset_disown(ds, da.dstg); 889 } 890 891 dsl_sync_task_group_destroy(da.dstg); 892 spa_close(spa, FTAG); 893 return (err); 894 } 895 896 /* 897 * ds must be opened as OWNER. On return (whether successful or not), 898 * ds will be closed and caller can no longer dereference it. 899 */ 900 int 901 dsl_dataset_destroy(dsl_dataset_t *ds, void *tag) 902 { 903 int err; 904 dsl_sync_task_group_t *dstg; 905 objset_t *os; 906 dsl_dir_t *dd; 907 uint64_t obj; 908 909 if (dsl_dataset_is_snapshot(ds)) { 910 /* Destroying a snapshot is simpler */ 911 dsl_dataset_make_exclusive(ds, tag); 912 913 if (ds->ds_user_ptr) { 914 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 915 ds->ds_user_ptr = NULL; 916 } 917 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 918 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, 919 ds, tag, 0); 920 goto out; 921 } 922 923 dd = ds->ds_dir; 924 925 /* 926 * Check for errors and mark this ds as inconsistent, in 927 * case we crash while freeing the objects. 928 */ 929 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, 930 dsl_dataset_destroy_begin_sync, ds, NULL, 0); 931 if (err) 932 goto out; 933 934 err = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); 935 if (err) 936 goto out; 937 938 /* 939 * remove the objects in open context, so that we won't 940 * have too much to do in syncing context. 941 */ 942 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 943 ds->ds_phys->ds_prev_snap_txg)) { 944 /* 945 * Ignore errors, if there is not enough disk space 946 * we will deal with it in dsl_dataset_destroy_sync(). 947 */ 948 (void) dmu_free_object(os, obj); 949 } 950 951 dmu_objset_close(os); 952 if (err != ESRCH) 953 goto out; 954 955 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 956 err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd); 957 rw_exit(&dd->dd_pool->dp_config_rwlock); 958 959 if (err) 960 goto out; 961 962 if (ds->ds_user_ptr) { 963 /* 964 * We need to sync out all in-flight IO before we try 965 * to evict (the dataset evict func is trying to clear 966 * the cached entries for this dataset in the ARC). 967 */ 968 txg_wait_synced(dd->dd_pool, 0); 969 } 970 971 /* 972 * Blow away the dsl_dir + head dataset. 973 */ 974 dsl_dataset_make_exclusive(ds, tag); 975 if (ds->ds_user_ptr) { 976 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 977 ds->ds_user_ptr = NULL; 978 } 979 dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); 980 dsl_sync_task_create(dstg, dsl_dataset_destroy_check, 981 dsl_dataset_destroy_sync, ds, tag, 0); 982 dsl_sync_task_create(dstg, dsl_dir_destroy_check, 983 dsl_dir_destroy_sync, dd, FTAG, 0); 984 err = dsl_sync_task_group_wait(dstg); 985 dsl_sync_task_group_destroy(dstg); 986 /* if it is successful, dsl_dir_destroy_sync will close the dd */ 987 if (err) 988 dsl_dir_close(dd, FTAG); 989 out: 990 dsl_dataset_disown(ds, tag); 991 return (err); 992 } 993 994 int 995 dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost) 996 { 997 ASSERT(ds->ds_owner); 998 999 return (dsl_sync_task_do(ds->ds_dir->dd_pool, 1000 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, 1001 ds, &ost, 0)); 1002 } 1003 1004 void * 1005 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, 1006 void *p, dsl_dataset_evict_func_t func) 1007 { 1008 void *old; 1009 1010 mutex_enter(&ds->ds_lock); 1011 old = ds->ds_user_ptr; 1012 if (old == NULL) { 1013 ds->ds_user_ptr = p; 1014 ds->ds_user_evict_func = func; 1015 } 1016 mutex_exit(&ds->ds_lock); 1017 return (old); 1018 } 1019 1020 void * 1021 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) 1022 { 1023 return (ds->ds_user_ptr); 1024 } 1025 1026 1027 blkptr_t * 1028 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1029 { 1030 return (&ds->ds_phys->ds_bp); 1031 } 1032 1033 void 1034 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1035 { 1036 ASSERT(dmu_tx_is_syncing(tx)); 1037 /* If it's the meta-objset, set dp_meta_rootbp */ 1038 if (ds == NULL) { 1039 tx->tx_pool->dp_meta_rootbp = *bp; 1040 } else { 1041 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1042 ds->ds_phys->ds_bp = *bp; 1043 } 1044 } 1045 1046 spa_t * 1047 dsl_dataset_get_spa(dsl_dataset_t *ds) 1048 { 1049 return (ds->ds_dir->dd_pool->dp_spa); 1050 } 1051 1052 void 1053 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1054 { 1055 dsl_pool_t *dp; 1056 1057 if (ds == NULL) /* this is the meta-objset */ 1058 return; 1059 1060 ASSERT(ds->ds_user_ptr != NULL); 1061 1062 if (ds->ds_phys->ds_next_snap_obj != 0) 1063 panic("dirtying snapshot!"); 1064 1065 dp = ds->ds_dir->dd_pool; 1066 1067 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { 1068 /* up the hold count until we can be written out */ 1069 dmu_buf_add_ref(ds->ds_dbuf, ds); 1070 } 1071 } 1072 1073 /* 1074 * The unique space in the head dataset can be calculated by subtracting 1075 * the space used in the most recent snapshot, that is still being used 1076 * in this file system, from the space currently in use. To figure out 1077 * the space in the most recent snapshot still in use, we need to take 1078 * the total space used in the snapshot and subtract out the space that 1079 * has been freed up since the snapshot was taken. 1080 */ 1081 static void 1082 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1083 { 1084 uint64_t mrs_used; 1085 uint64_t dlused, dlcomp, dluncomp; 1086 1087 ASSERT(ds->ds_object == ds->ds_dir->dd_phys->dd_head_dataset_obj); 1088 1089 if (ds->ds_phys->ds_prev_snap_obj != 0) 1090 mrs_used = ds->ds_prev->ds_phys->ds_used_bytes; 1091 else 1092 mrs_used = 0; 1093 1094 VERIFY(0 == bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, 1095 &dluncomp)); 1096 1097 ASSERT3U(dlused, <=, mrs_used); 1098 ds->ds_phys->ds_unique_bytes = 1099 ds->ds_phys->ds_used_bytes - (mrs_used - dlused); 1100 1101 if (!DS_UNIQUE_IS_ACCURATE(ds) && 1102 spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1103 SPA_VERSION_UNIQUE_ACCURATE) 1104 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1105 } 1106 1107 static uint64_t 1108 dsl_dataset_unique(dsl_dataset_t *ds) 1109 { 1110 if (!DS_UNIQUE_IS_ACCURATE(ds) && !dsl_dataset_is_snapshot(ds)) 1111 dsl_dataset_recalc_head_uniq(ds); 1112 1113 return (ds->ds_phys->ds_unique_bytes); 1114 } 1115 1116 struct killarg { 1117 int64_t *usedp; 1118 int64_t *compressedp; 1119 int64_t *uncompressedp; 1120 zio_t *zio; 1121 dmu_tx_t *tx; 1122 }; 1123 1124 static int 1125 kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) 1126 { 1127 struct killarg *ka = arg; 1128 blkptr_t *bp = &bc->bc_blkptr; 1129 1130 ASSERT3U(bc->bc_errno, ==, 0); 1131 1132 /* 1133 * Since this callback is not called concurrently, no lock is 1134 * needed on the accounting values. 1135 */ 1136 *ka->usedp += bp_get_dasize(spa, bp); 1137 *ka->compressedp += BP_GET_PSIZE(bp); 1138 *ka->uncompressedp += BP_GET_UCSIZE(bp); 1139 /* XXX check for EIO? */ 1140 (void) dsl_free(ka->zio, spa_get_dsl(spa), ka->tx->tx_txg, 1141 bp, NULL, NULL, ARC_NOWAIT); 1142 return (0); 1143 } 1144 1145 /* ARGSUSED */ 1146 static int 1147 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) 1148 { 1149 dsl_dataset_t *ds = arg1; 1150 dmu_objset_type_t *ost = arg2; 1151 1152 /* 1153 * We can only roll back to emptyness if it is a ZPL objset. 1154 */ 1155 if (*ost != DMU_OST_ZFS && ds->ds_phys->ds_prev_snap_txg == 0) 1156 return (EINVAL); 1157 1158 /* 1159 * This must not be a snapshot. 1160 */ 1161 if (ds->ds_phys->ds_next_snap_obj != 0) 1162 return (EINVAL); 1163 1164 /* 1165 * If we made changes this txg, traverse_dsl_dataset won't find 1166 * them. Try again. 1167 */ 1168 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1169 return (EAGAIN); 1170 1171 return (0); 1172 } 1173 1174 /* ARGSUSED */ 1175 static void 1176 dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1177 { 1178 dsl_dataset_t *ds = arg1; 1179 dmu_objset_type_t *ost = arg2; 1180 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1181 1182 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1183 1184 /* 1185 * Before the roll back destroy the zil. 1186 */ 1187 if (ds->ds_user_ptr != NULL) { 1188 zil_rollback_destroy( 1189 ((objset_impl_t *)ds->ds_user_ptr)->os_zil, tx); 1190 1191 /* 1192 * We need to make sure that the objset_impl_t is reopened after 1193 * we do the rollback, otherwise it will have the wrong 1194 * objset_phys_t. Normally this would happen when this 1195 * dataset-open is closed, thus causing the 1196 * dataset to be immediately evicted. But when doing "zfs recv 1197 * -F", we reopen the objset before that, so that there is no 1198 * window where the dataset is closed and inconsistent. 1199 */ 1200 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 1201 ds->ds_user_ptr = NULL; 1202 } 1203 1204 /* Zero out the deadlist. */ 1205 bplist_close(&ds->ds_deadlist); 1206 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1207 ds->ds_phys->ds_deadlist_obj = 1208 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1209 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1210 ds->ds_phys->ds_deadlist_obj)); 1211 1212 { 1213 /* Free blkptrs that we gave birth to */ 1214 zio_t *zio; 1215 int64_t used = 0, compressed = 0, uncompressed = 0; 1216 struct killarg ka; 1217 int64_t delta; 1218 1219 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, 1220 ZIO_FLAG_MUSTSUCCEED); 1221 ka.usedp = &used; 1222 ka.compressedp = &compressed; 1223 ka.uncompressedp = &uncompressed; 1224 ka.zio = zio; 1225 ka.tx = tx; 1226 (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1227 ADVANCE_POST, kill_blkptr, &ka); 1228 (void) zio_wait(zio); 1229 1230 /* only deduct space beyond any refreservation */ 1231 delta = parent_delta(ds, -used); 1232 dsl_dir_diduse_space(ds->ds_dir, 1233 delta, -compressed, -uncompressed, tx); 1234 } 1235 1236 if (ds->ds_prev && ds->ds_prev != ds->ds_dir->dd_pool->dp_origin_snap) { 1237 /* Change our contents to that of the prev snapshot */ 1238 ASSERT3U(ds->ds_prev->ds_object, ==, 1239 ds->ds_phys->ds_prev_snap_obj); 1240 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; 1241 ds->ds_phys->ds_used_bytes = 1242 ds->ds_prev->ds_phys->ds_used_bytes; 1243 ds->ds_phys->ds_compressed_bytes = 1244 ds->ds_prev->ds_phys->ds_compressed_bytes; 1245 ds->ds_phys->ds_uncompressed_bytes = 1246 ds->ds_prev->ds_phys->ds_uncompressed_bytes; 1247 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; 1248 ds->ds_phys->ds_unique_bytes = 0; 1249 1250 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1251 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1252 ds->ds_prev->ds_phys->ds_unique_bytes = 0; 1253 } 1254 } else { 1255 objset_impl_t *osi; 1256 1257 /* Zero out our contents, recreate objset */ 1258 bzero(&ds->ds_phys->ds_bp, sizeof (blkptr_t)); 1259 ds->ds_phys->ds_used_bytes = 0; 1260 ds->ds_phys->ds_compressed_bytes = 0; 1261 ds->ds_phys->ds_uncompressed_bytes = 0; 1262 ds->ds_phys->ds_flags = 0; 1263 ds->ds_phys->ds_unique_bytes = 0; 1264 osi = dmu_objset_create_impl(ds->ds_dir->dd_pool->dp_spa, ds, 1265 &ds->ds_phys->ds_bp, *ost, tx); 1266 #ifdef _KERNEL 1267 zfs_create_fs(&osi->os, kcred, NULL, tx); 1268 #endif 1269 } 1270 1271 spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, 1272 tx, cr, "dataset = %llu", ds->ds_object); 1273 } 1274 1275 /* ARGSUSED */ 1276 static int 1277 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) 1278 { 1279 dsl_dataset_t *ds = arg1; 1280 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1281 uint64_t count; 1282 int err; 1283 1284 /* 1285 * Can't delete a head dataset if there are snapshots of it. 1286 * (Except if the only snapshots are from the branch we cloned 1287 * from.) 1288 */ 1289 if (ds->ds_prev != NULL && 1290 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1291 return (EINVAL); 1292 1293 /* 1294 * This is really a dsl_dir thing, but check it here so that 1295 * we'll be less likely to leave this dataset inconsistent & 1296 * nearly destroyed. 1297 */ 1298 err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count); 1299 if (err) 1300 return (err); 1301 if (count != 0) 1302 return (EEXIST); 1303 1304 return (0); 1305 } 1306 1307 /* ARGSUSED */ 1308 static void 1309 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1310 { 1311 dsl_dataset_t *ds = arg1; 1312 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1313 1314 /* Mark it as inconsistent on-disk, in case we crash */ 1315 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1316 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 1317 1318 spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, 1319 cr, "dataset = %llu", ds->ds_object); 1320 } 1321 1322 /* ARGSUSED */ 1323 int 1324 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) 1325 { 1326 dsl_dataset_t *ds = arg1; 1327 1328 /* we have an owner hold, so noone else can destroy us */ 1329 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 1330 1331 /* Can't delete a branch point. */ 1332 if (ds->ds_phys->ds_num_children > 1) 1333 return (EEXIST); 1334 1335 /* 1336 * Can't delete a head dataset if there are snapshots of it. 1337 * (Except if the only snapshots are from the branch we cloned 1338 * from.) 1339 */ 1340 if (ds->ds_prev != NULL && 1341 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1342 return (EINVAL); 1343 1344 /* 1345 * If we made changes this txg, traverse_dsl_dataset won't find 1346 * them. Try again. 1347 */ 1348 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1349 return (EAGAIN); 1350 1351 /* XXX we should do some i/o error checking... */ 1352 return (0); 1353 } 1354 1355 struct refsarg { 1356 kmutex_t lock; 1357 boolean_t gone; 1358 kcondvar_t cv; 1359 }; 1360 1361 /* ARGSUSED */ 1362 static void 1363 dsl_dataset_refs_gone(dmu_buf_t *db, void *argv) 1364 { 1365 struct refsarg *arg = argv; 1366 1367 mutex_enter(&arg->lock); 1368 arg->gone = TRUE; 1369 cv_signal(&arg->cv); 1370 mutex_exit(&arg->lock); 1371 } 1372 1373 static void 1374 dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag) 1375 { 1376 struct refsarg arg; 1377 1378 mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL); 1379 cv_init(&arg.cv, NULL, CV_DEFAULT, NULL); 1380 arg.gone = FALSE; 1381 (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys, 1382 dsl_dataset_refs_gone); 1383 dmu_buf_rele(ds->ds_dbuf, tag); 1384 mutex_enter(&arg.lock); 1385 while (!arg.gone) 1386 cv_wait(&arg.cv, &arg.lock); 1387 ASSERT(arg.gone); 1388 mutex_exit(&arg.lock); 1389 ds->ds_dbuf = NULL; 1390 ds->ds_phys = NULL; 1391 mutex_destroy(&arg.lock); 1392 cv_destroy(&arg.cv); 1393 } 1394 1395 void 1396 dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) 1397 { 1398 dsl_dataset_t *ds = arg1; 1399 int64_t used = 0, compressed = 0, uncompressed = 0; 1400 zio_t *zio; 1401 int err; 1402 int after_branch_point = FALSE; 1403 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1404 objset_t *mos = dp->dp_meta_objset; 1405 dsl_dataset_t *ds_prev = NULL; 1406 uint64_t obj; 1407 1408 ASSERT(ds->ds_owner); 1409 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 1410 ASSERT(ds->ds_prev == NULL || 1411 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); 1412 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); 1413 1414 /* signal any waiters that this dataset is going away */ 1415 mutex_enter(&ds->ds_lock); 1416 ds->ds_owner = dsl_reaper; 1417 cv_broadcast(&ds->ds_exclusive_cv); 1418 mutex_exit(&ds->ds_lock); 1419 1420 /* Remove our reservation */ 1421 if (ds->ds_reserved != 0) { 1422 uint64_t val = 0; 1423 dsl_dataset_set_reservation_sync(ds, &val, cr, tx); 1424 ASSERT3U(ds->ds_reserved, ==, 0); 1425 } 1426 1427 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1428 1429 dsl_pool_ds_destroyed(ds, tx); 1430 1431 obj = ds->ds_object; 1432 1433 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1434 if (ds->ds_prev) { 1435 ds_prev = ds->ds_prev; 1436 } else { 1437 VERIFY(0 == dsl_dataset_hold_obj(dp, 1438 ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev)); 1439 } 1440 after_branch_point = 1441 (ds_prev->ds_phys->ds_next_snap_obj != obj); 1442 1443 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); 1444 if (after_branch_point && 1445 ds_prev->ds_phys->ds_next_clones_obj != 0) { 1446 VERIFY(0 == zap_remove_int(mos, 1447 ds_prev->ds_phys->ds_next_clones_obj, obj, tx)); 1448 if (ds->ds_phys->ds_next_snap_obj != 0) { 1449 VERIFY(0 == zap_add_int(mos, 1450 ds_prev->ds_phys->ds_next_clones_obj, 1451 ds->ds_phys->ds_next_snap_obj, tx)); 1452 } 1453 } 1454 if (after_branch_point && 1455 ds->ds_phys->ds_next_snap_obj == 0) { 1456 /* This clone is toast. */ 1457 ASSERT(ds_prev->ds_phys->ds_num_children > 1); 1458 ds_prev->ds_phys->ds_num_children--; 1459 } else if (!after_branch_point) { 1460 ds_prev->ds_phys->ds_next_snap_obj = 1461 ds->ds_phys->ds_next_snap_obj; 1462 } 1463 } 1464 1465 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1466 1467 if (ds->ds_phys->ds_next_snap_obj != 0) { 1468 blkptr_t bp; 1469 dsl_dataset_t *ds_next; 1470 uint64_t itor = 0; 1471 uint64_t old_unique; 1472 1473 VERIFY(0 == dsl_dataset_hold_obj(dp, 1474 ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next)); 1475 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); 1476 1477 old_unique = dsl_dataset_unique(ds_next); 1478 1479 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); 1480 ds_next->ds_phys->ds_prev_snap_obj = 1481 ds->ds_phys->ds_prev_snap_obj; 1482 ds_next->ds_phys->ds_prev_snap_txg = 1483 ds->ds_phys->ds_prev_snap_txg; 1484 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1485 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); 1486 1487 /* 1488 * Transfer to our deadlist (which will become next's 1489 * new deadlist) any entries from next's current 1490 * deadlist which were born before prev, and free the 1491 * other entries. 1492 * 1493 * XXX we're doing this long task with the config lock held 1494 */ 1495 while (bplist_iterate(&ds_next->ds_deadlist, &itor, &bp) == 0) { 1496 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { 1497 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, 1498 &bp, tx)); 1499 if (ds_prev && !after_branch_point && 1500 bp.blk_birth > 1501 ds_prev->ds_phys->ds_prev_snap_txg) { 1502 ds_prev->ds_phys->ds_unique_bytes += 1503 bp_get_dasize(dp->dp_spa, &bp); 1504 } 1505 } else { 1506 used += bp_get_dasize(dp->dp_spa, &bp); 1507 compressed += BP_GET_PSIZE(&bp); 1508 uncompressed += BP_GET_UCSIZE(&bp); 1509 /* XXX check return value? */ 1510 (void) dsl_free(zio, dp, tx->tx_txg, 1511 &bp, NULL, NULL, ARC_NOWAIT); 1512 } 1513 } 1514 1515 /* free next's deadlist */ 1516 bplist_close(&ds_next->ds_deadlist); 1517 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); 1518 1519 /* set next's deadlist to our deadlist */ 1520 bplist_close(&ds->ds_deadlist); 1521 ds_next->ds_phys->ds_deadlist_obj = 1522 ds->ds_phys->ds_deadlist_obj; 1523 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, 1524 ds_next->ds_phys->ds_deadlist_obj)); 1525 ds->ds_phys->ds_deadlist_obj = 0; 1526 1527 if (ds_next->ds_phys->ds_next_snap_obj != 0) { 1528 /* 1529 * Update next's unique to include blocks which 1530 * were previously shared by only this snapshot 1531 * and it. Those blocks will be born after the 1532 * prev snap and before this snap, and will have 1533 * died after the next snap and before the one 1534 * after that (ie. be on the snap after next's 1535 * deadlist). 1536 * 1537 * XXX we're doing this long task with the 1538 * config lock held 1539 */ 1540 dsl_dataset_t *ds_after_next; 1541 1542 VERIFY(0 == dsl_dataset_hold_obj(dp, 1543 ds_next->ds_phys->ds_next_snap_obj, 1544 FTAG, &ds_after_next)); 1545 itor = 0; 1546 while (bplist_iterate(&ds_after_next->ds_deadlist, 1547 &itor, &bp) == 0) { 1548 if (bp.blk_birth > 1549 ds->ds_phys->ds_prev_snap_txg && 1550 bp.blk_birth <= 1551 ds->ds_phys->ds_creation_txg) { 1552 ds_next->ds_phys->ds_unique_bytes += 1553 bp_get_dasize(dp->dp_spa, &bp); 1554 } 1555 } 1556 1557 dsl_dataset_rele(ds_after_next, FTAG); 1558 ASSERT3P(ds_next->ds_prev, ==, NULL); 1559 } else { 1560 ASSERT3P(ds_next->ds_prev, ==, ds); 1561 dsl_dataset_drop_ref(ds_next->ds_prev, ds_next); 1562 ds_next->ds_prev = NULL; 1563 if (ds_prev) { 1564 VERIFY(0 == dsl_dataset_get_ref(dp, 1565 ds->ds_phys->ds_prev_snap_obj, 1566 ds_next, &ds_next->ds_prev)); 1567 } 1568 1569 dsl_dataset_recalc_head_uniq(ds_next); 1570 1571 /* 1572 * Reduce the amount of our unconsmed refreservation 1573 * being charged to our parent by the amount of 1574 * new unique data we have gained. 1575 */ 1576 if (old_unique < ds_next->ds_reserved) { 1577 int64_t mrsdelta; 1578 uint64_t new_unique = 1579 ds_next->ds_phys->ds_unique_bytes; 1580 1581 ASSERT(old_unique <= new_unique); 1582 mrsdelta = MIN(new_unique - old_unique, 1583 ds_next->ds_reserved - old_unique); 1584 dsl_dir_diduse_space(ds->ds_dir, -mrsdelta, 1585 0, 0, tx); 1586 } 1587 } 1588 dsl_dataset_rele(ds_next, FTAG); 1589 1590 /* 1591 * NB: unique_bytes might not be accurate for the head objset. 1592 * Before SPA_VERSION 9, we didn't update its value when we 1593 * deleted the most recent snapshot. 1594 */ 1595 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); 1596 } else { 1597 /* 1598 * There's no next snapshot, so this is a head dataset. 1599 * Destroy the deadlist. Unless it's a clone, the 1600 * deadlist should be empty. (If it's a clone, it's 1601 * safe to ignore the deadlist contents.) 1602 */ 1603 struct killarg ka; 1604 1605 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); 1606 bplist_close(&ds->ds_deadlist); 1607 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1608 ds->ds_phys->ds_deadlist_obj = 0; 1609 1610 /* 1611 * Free everything that we point to (that's born after 1612 * the previous snapshot, if we are a clone) 1613 * 1614 * XXX we're doing this long task with the config lock held 1615 */ 1616 ka.usedp = &used; 1617 ka.compressedp = &compressed; 1618 ka.uncompressedp = &uncompressed; 1619 ka.zio = zio; 1620 ka.tx = tx; 1621 err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1622 ADVANCE_POST, kill_blkptr, &ka); 1623 ASSERT3U(err, ==, 0); 1624 ASSERT(spa_version(dp->dp_spa) < 1625 SPA_VERSION_UNIQUE_ACCURATE || 1626 used == ds->ds_phys->ds_unique_bytes); 1627 } 1628 1629 err = zio_wait(zio); 1630 ASSERT3U(err, ==, 0); 1631 1632 dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); 1633 1634 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { 1635 /* Erase the link in the dir */ 1636 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 1637 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; 1638 ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0); 1639 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); 1640 ASSERT(err == 0); 1641 } else { 1642 /* remove from snapshot namespace */ 1643 dsl_dataset_t *ds_head; 1644 ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0); 1645 VERIFY(0 == dsl_dataset_hold_obj(dp, 1646 ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head)); 1647 VERIFY(0 == dsl_dataset_get_snapname(ds)); 1648 #ifdef ZFS_DEBUG 1649 { 1650 uint64_t val; 1651 1652 err = dsl_dataset_snap_lookup(ds_head, 1653 ds->ds_snapname, &val); 1654 ASSERT3U(err, ==, 0); 1655 ASSERT3U(val, ==, obj); 1656 } 1657 #endif 1658 err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx); 1659 ASSERT(err == 0); 1660 dsl_dataset_rele(ds_head, FTAG); 1661 } 1662 1663 if (ds_prev && ds->ds_prev != ds_prev) 1664 dsl_dataset_rele(ds_prev, FTAG); 1665 1666 spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); 1667 spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, 1668 cr, "dataset = %llu", ds->ds_object); 1669 1670 if (ds->ds_phys->ds_next_clones_obj != 0) { 1671 uint64_t count; 1672 ASSERT(0 == zap_count(mos, 1673 ds->ds_phys->ds_next_clones_obj, &count) && count == 0); 1674 VERIFY(0 == dmu_object_free(mos, 1675 ds->ds_phys->ds_next_clones_obj, tx)); 1676 } 1677 if (ds->ds_phys->ds_props_obj != 0) { 1678 VERIFY(0 == zap_destroy(mos, 1679 ds->ds_phys->ds_props_obj, tx)); 1680 } 1681 dsl_dir_close(ds->ds_dir, ds); 1682 ds->ds_dir = NULL; 1683 dsl_dataset_drain_refs(ds, tag); 1684 VERIFY(0 == dmu_object_free(mos, obj, tx)); 1685 } 1686 1687 static int 1688 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1689 { 1690 uint64_t asize; 1691 1692 if (!dmu_tx_is_syncing(tx)) 1693 return (0); 1694 1695 /* 1696 * If there's an fs-only reservation, any blocks that might become 1697 * owned by the snapshot dataset must be accommodated by space 1698 * outside of the reservation. 1699 */ 1700 asize = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1701 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, FALSE)) 1702 return (ENOSPC); 1703 1704 /* 1705 * Propogate any reserved space for this snapshot to other 1706 * snapshot checks in this sync group. 1707 */ 1708 if (asize > 0) 1709 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1710 1711 return (0); 1712 } 1713 1714 /* ARGSUSED */ 1715 int 1716 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 1717 { 1718 dsl_dataset_t *ds = arg1; 1719 const char *snapname = arg2; 1720 int err; 1721 uint64_t value; 1722 1723 /* 1724 * We don't allow multiple snapshots of the same txg. If there 1725 * is already one, try again. 1726 */ 1727 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 1728 return (EAGAIN); 1729 1730 /* 1731 * Check for conflicting name snapshot name. 1732 */ 1733 err = dsl_dataset_snap_lookup(ds, snapname, &value); 1734 if (err == 0) 1735 return (EEXIST); 1736 if (err != ENOENT) 1737 return (err); 1738 1739 /* 1740 * Check that the dataset's name is not too long. Name consists 1741 * of the dataset's length + 1 for the @-sign + snapshot name's length 1742 */ 1743 if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) 1744 return (ENAMETOOLONG); 1745 1746 err = dsl_dataset_snapshot_reserve_space(ds, tx); 1747 if (err) 1748 return (err); 1749 1750 ds->ds_trysnap_txg = tx->tx_txg; 1751 return (0); 1752 } 1753 1754 void 1755 dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1756 { 1757 dsl_dataset_t *ds = arg1; 1758 const char *snapname = arg2; 1759 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1760 dmu_buf_t *dbuf; 1761 dsl_dataset_phys_t *dsphys; 1762 uint64_t dsobj, crtxg; 1763 objset_t *mos = dp->dp_meta_objset; 1764 int err; 1765 1766 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1767 1768 /* 1769 * The origin's ds_creation_txg has to be < TXG_INITIAL 1770 */ 1771 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1772 crtxg = 1; 1773 else 1774 crtxg = tx->tx_txg; 1775 1776 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1777 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1778 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1779 dmu_buf_will_dirty(dbuf, tx); 1780 dsphys = dbuf->db_data; 1781 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1782 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1783 dsphys->ds_fsid_guid = unique_create(); 1784 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1785 sizeof (dsphys->ds_guid)); 1786 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1787 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1788 dsphys->ds_next_snap_obj = ds->ds_object; 1789 dsphys->ds_num_children = 1; 1790 dsphys->ds_creation_time = gethrestime_sec(); 1791 dsphys->ds_creation_txg = crtxg; 1792 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1793 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; 1794 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1795 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1796 dsphys->ds_flags = ds->ds_phys->ds_flags; 1797 dsphys->ds_bp = ds->ds_phys->ds_bp; 1798 dmu_buf_rele(dbuf, FTAG); 1799 1800 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1801 if (ds->ds_prev) { 1802 uint64_t next_clones_obj = 1803 ds->ds_prev->ds_phys->ds_next_clones_obj; 1804 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1805 ds->ds_object || 1806 ds->ds_prev->ds_phys->ds_num_children > 1); 1807 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1808 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1809 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1810 ds->ds_prev->ds_phys->ds_creation_txg); 1811 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1812 } else if (next_clones_obj != 0) { 1813 VERIFY3U(0, ==, zap_remove_int(mos, 1814 next_clones_obj, dsphys->ds_next_snap_obj, tx)); 1815 VERIFY3U(0, ==, zap_add_int(mos, 1816 next_clones_obj, dsobj, tx)); 1817 } 1818 } 1819 1820 /* 1821 * If we have a reference-reservation on this dataset, we will 1822 * need to increase the amount of refreservation being charged 1823 * since our unique space is going to zero. 1824 */ 1825 if (ds->ds_reserved) { 1826 int64_t add = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1827 dsl_dir_diduse_space(ds->ds_dir, add, 0, 0, tx); 1828 } 1829 1830 bplist_close(&ds->ds_deadlist); 1831 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1832 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1833 ds->ds_phys->ds_prev_snap_obj = dsobj; 1834 ds->ds_phys->ds_prev_snap_txg = crtxg; 1835 ds->ds_phys->ds_unique_bytes = 0; 1836 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1837 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1838 ds->ds_phys->ds_deadlist_obj = 1839 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1840 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1841 ds->ds_phys->ds_deadlist_obj)); 1842 1843 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); 1844 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1845 snapname, 8, 1, &dsobj, tx); 1846 ASSERT(err == 0); 1847 1848 if (ds->ds_prev) 1849 dsl_dataset_drop_ref(ds->ds_prev, ds); 1850 VERIFY(0 == dsl_dataset_get_ref(dp, 1851 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1852 1853 dsl_pool_ds_snapshotted(ds, tx); 1854 1855 spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, 1856 "dataset = %llu", dsobj); 1857 } 1858 1859 void 1860 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1861 { 1862 ASSERT(dmu_tx_is_syncing(tx)); 1863 ASSERT(ds->ds_user_ptr != NULL); 1864 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1865 1866 /* 1867 * in case we had to change ds_fsid_guid when we opened it, 1868 * sync it out now. 1869 */ 1870 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1871 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1872 1873 dsl_dir_dirty(ds->ds_dir, tx); 1874 dmu_objset_sync(ds->ds_user_ptr, zio, tx); 1875 } 1876 1877 void 1878 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1879 { 1880 uint64_t refd, avail, uobjs, aobjs; 1881 1882 dsl_dir_stats(ds->ds_dir, nv); 1883 1884 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1885 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1886 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1887 1888 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1889 ds->ds_phys->ds_creation_time); 1890 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1891 ds->ds_phys->ds_creation_txg); 1892 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1893 ds->ds_quota); 1894 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1895 ds->ds_reserved); 1896 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1897 ds->ds_phys->ds_guid); 1898 1899 if (ds->ds_phys->ds_next_snap_obj) { 1900 /* 1901 * This is a snapshot; override the dd's space used with 1902 * our unique space and compression ratio. 1903 */ 1904 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1905 ds->ds_phys->ds_unique_bytes); 1906 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 1907 ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1908 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1909 ds->ds_phys->ds_compressed_bytes)); 1910 } 1911 } 1912 1913 void 1914 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1915 { 1916 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1917 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1918 stat->dds_guid = ds->ds_phys->ds_guid; 1919 if (ds->ds_phys->ds_next_snap_obj) { 1920 stat->dds_is_snapshot = B_TRUE; 1921 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1922 } 1923 1924 /* clone origin is really a dsl_dir thing... */ 1925 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); 1926 if (dsl_dir_is_clone(ds->ds_dir)) { 1927 dsl_dataset_t *ods; 1928 1929 VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool, 1930 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1931 dsl_dataset_name(ods, stat->dds_origin); 1932 dsl_dataset_drop_ref(ods, FTAG); 1933 } 1934 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); 1935 } 1936 1937 uint64_t 1938 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1939 { 1940 return (ds->ds_fsid_guid); 1941 } 1942 1943 void 1944 dsl_dataset_space(dsl_dataset_t *ds, 1945 uint64_t *refdbytesp, uint64_t *availbytesp, 1946 uint64_t *usedobjsp, uint64_t *availobjsp) 1947 { 1948 *refdbytesp = ds->ds_phys->ds_used_bytes; 1949 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1950 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1951 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1952 if (ds->ds_quota != 0) { 1953 /* 1954 * Adjust available bytes according to refquota 1955 */ 1956 if (*refdbytesp < ds->ds_quota) 1957 *availbytesp = MIN(*availbytesp, 1958 ds->ds_quota - *refdbytesp); 1959 else 1960 *availbytesp = 0; 1961 } 1962 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 1963 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1964 } 1965 1966 boolean_t 1967 dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) 1968 { 1969 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1970 1971 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 1972 dsl_pool_sync_context(dp)); 1973 if (ds->ds_prev == NULL) 1974 return (B_FALSE); 1975 if (ds->ds_phys->ds_bp.blk_birth > 1976 ds->ds_prev->ds_phys->ds_creation_txg) 1977 return (B_TRUE); 1978 return (B_FALSE); 1979 } 1980 1981 /* ARGSUSED */ 1982 static int 1983 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) 1984 { 1985 dsl_dataset_t *ds = arg1; 1986 char *newsnapname = arg2; 1987 dsl_dir_t *dd = ds->ds_dir; 1988 dsl_dataset_t *hds; 1989 uint64_t val; 1990 int err; 1991 1992 err = dsl_dataset_hold_obj(dd->dd_pool, 1993 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds); 1994 if (err) 1995 return (err); 1996 1997 /* new name better not be in use */ 1998 err = dsl_dataset_snap_lookup(hds, newsnapname, &val); 1999 dsl_dataset_rele(hds, FTAG); 2000 2001 if (err == 0) 2002 err = EEXIST; 2003 else if (err == ENOENT) 2004 err = 0; 2005 2006 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2007 if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) 2008 err = ENAMETOOLONG; 2009 2010 return (err); 2011 } 2012 2013 static void 2014 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, 2015 cred_t *cr, dmu_tx_t *tx) 2016 { 2017 dsl_dataset_t *ds = arg1; 2018 const char *newsnapname = arg2; 2019 dsl_dir_t *dd = ds->ds_dir; 2020 objset_t *mos = dd->dd_pool->dp_meta_objset; 2021 dsl_dataset_t *hds; 2022 int err; 2023 2024 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); 2025 2026 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, 2027 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds)); 2028 2029 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2030 err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx); 2031 ASSERT3U(err, ==, 0); 2032 mutex_enter(&ds->ds_lock); 2033 (void) strcpy(ds->ds_snapname, newsnapname); 2034 mutex_exit(&ds->ds_lock); 2035 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, 2036 ds->ds_snapname, 8, 1, &ds->ds_object, tx); 2037 ASSERT3U(err, ==, 0); 2038 2039 spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, 2040 cr, "dataset = %llu", ds->ds_object); 2041 dsl_dataset_rele(hds, FTAG); 2042 } 2043 2044 struct renamesnaparg { 2045 dsl_sync_task_group_t *dstg; 2046 char failed[MAXPATHLEN]; 2047 char *oldsnap; 2048 char *newsnap; 2049 }; 2050 2051 static int 2052 dsl_snapshot_rename_one(char *name, void *arg) 2053 { 2054 struct renamesnaparg *ra = arg; 2055 dsl_dataset_t *ds = NULL; 2056 char *cp; 2057 int err; 2058 2059 cp = name + strlen(name); 2060 *cp = '@'; 2061 (void) strcpy(cp + 1, ra->oldsnap); 2062 2063 /* 2064 * For recursive snapshot renames the parent won't be changing 2065 * so we just pass name for both the to/from argument. 2066 */ 2067 if (err = zfs_secpolicy_rename_perms(name, name, CRED())) { 2068 (void) strcpy(ra->failed, name); 2069 return (err); 2070 } 2071 2072 #ifdef _KERNEL 2073 /* 2074 * For all filesystems undergoing rename, we'll need to unmount it. 2075 */ 2076 (void) zfs_unmount_snap(name, NULL); 2077 #endif 2078 err = dsl_dataset_hold(name, ra->dstg, &ds); 2079 *cp = '\0'; 2080 if (err == ENOENT) { 2081 return (0); 2082 } else if (err) { 2083 (void) strcpy(ra->failed, name); 2084 return (err); 2085 } 2086 2087 dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, 2088 dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); 2089 2090 return (0); 2091 } 2092 2093 static int 2094 dsl_recursive_rename(char *oldname, const char *newname) 2095 { 2096 int err; 2097 struct renamesnaparg *ra; 2098 dsl_sync_task_t *dst; 2099 spa_t *spa; 2100 char *cp, *fsname = spa_strdup(oldname); 2101 int len = strlen(oldname); 2102 2103 /* truncate the snapshot name to get the fsname */ 2104 cp = strchr(fsname, '@'); 2105 *cp = '\0'; 2106 2107 err = spa_open(fsname, &spa, FTAG); 2108 if (err) { 2109 kmem_free(fsname, len + 1); 2110 return (err); 2111 } 2112 ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP); 2113 ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 2114 2115 ra->oldsnap = strchr(oldname, '@') + 1; 2116 ra->newsnap = strchr(newname, '@') + 1; 2117 *ra->failed = '\0'; 2118 2119 err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, 2120 DS_FIND_CHILDREN); 2121 kmem_free(fsname, len + 1); 2122 2123 if (err == 0) { 2124 err = dsl_sync_task_group_wait(ra->dstg); 2125 } 2126 2127 for (dst = list_head(&ra->dstg->dstg_tasks); dst; 2128 dst = list_next(&ra->dstg->dstg_tasks, dst)) { 2129 dsl_dataset_t *ds = dst->dst_arg1; 2130 if (dst->dst_err) { 2131 dsl_dir_name(ds->ds_dir, ra->failed); 2132 (void) strcat(ra->failed, "@"); 2133 (void) strcat(ra->failed, ra->newsnap); 2134 } 2135 dsl_dataset_rele(ds, ra->dstg); 2136 } 2137 2138 if (err) 2139 (void) strcpy(oldname, ra->failed); 2140 2141 dsl_sync_task_group_destroy(ra->dstg); 2142 kmem_free(ra, sizeof (struct renamesnaparg)); 2143 spa_close(spa, FTAG); 2144 return (err); 2145 } 2146 2147 static int 2148 dsl_valid_rename(char *oldname, void *arg) 2149 { 2150 int delta = *(int *)arg; 2151 2152 if (strlen(oldname) + delta >= MAXNAMELEN) 2153 return (ENAMETOOLONG); 2154 2155 return (0); 2156 } 2157 2158 #pragma weak dmu_objset_rename = dsl_dataset_rename 2159 int 2160 dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive) 2161 { 2162 dsl_dir_t *dd; 2163 dsl_dataset_t *ds; 2164 const char *tail; 2165 int err; 2166 2167 err = dsl_dir_open(oldname, FTAG, &dd, &tail); 2168 if (err) 2169 return (err); 2170 if (tail == NULL) { 2171 int delta = strlen(newname) - strlen(oldname); 2172 2173 /* if we're growing, validate child name lengths */ 2174 if (delta > 0) 2175 err = dmu_objset_find(oldname, dsl_valid_rename, 2176 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); 2177 2178 if (!err) 2179 err = dsl_dir_rename(dd, newname); 2180 dsl_dir_close(dd, FTAG); 2181 return (err); 2182 } 2183 if (tail[0] != '@') { 2184 /* the name ended in a nonexistant component */ 2185 dsl_dir_close(dd, FTAG); 2186 return (ENOENT); 2187 } 2188 2189 dsl_dir_close(dd, FTAG); 2190 2191 /* new name must be snapshot in same filesystem */ 2192 tail = strchr(newname, '@'); 2193 if (tail == NULL) 2194 return (EINVAL); 2195 tail++; 2196 if (strncmp(oldname, newname, tail - newname) != 0) 2197 return (EXDEV); 2198 2199 if (recursive) { 2200 err = dsl_recursive_rename(oldname, newname); 2201 } else { 2202 err = dsl_dataset_hold(oldname, FTAG, &ds); 2203 if (err) 2204 return (err); 2205 2206 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2207 dsl_dataset_snapshot_rename_check, 2208 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); 2209 2210 dsl_dataset_rele(ds, FTAG); 2211 } 2212 2213 return (err); 2214 } 2215 2216 struct promotenode { 2217 list_node_t link; 2218 dsl_dataset_t *ds; 2219 }; 2220 2221 struct promotearg { 2222 list_t snap_list; 2223 dsl_dataset_t *clone_origin, *old_head; 2224 uint64_t used, comp, uncomp, unique; 2225 uint64_t newnext_obj; 2226 }; 2227 2228 /* ARGSUSED */ 2229 static int 2230 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) 2231 { 2232 dsl_dataset_t *hds = arg1; 2233 struct promotearg *pa = arg2; 2234 struct promotenode *snap = list_head(&pa->snap_list); 2235 dsl_pool_t *dp = hds->ds_dir->dd_pool; 2236 dsl_dataset_t *origin_ds = snap->ds; 2237 dsl_dataset_t *newnext_ds; 2238 char *name; 2239 uint64_t itor = 0; 2240 blkptr_t bp; 2241 int err; 2242 2243 /* Check that it is a real clone */ 2244 if (!dsl_dir_is_clone(hds->ds_dir)) 2245 return (EINVAL); 2246 2247 /* Since this is so expensive, don't do the preliminary check */ 2248 if (!dmu_tx_is_syncing(tx)) 2249 return (0); 2250 2251 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) 2252 return (EXDEV); 2253 2254 /* find origin's new next ds */ 2255 newnext_ds = hds; 2256 while (newnext_ds->ds_phys->ds_prev_snap_obj != origin_ds->ds_object) { 2257 dsl_dataset_t *prev; 2258 2259 err = dsl_dataset_hold_obj(dp, 2260 newnext_ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 2261 if (newnext_ds != hds) 2262 dsl_dataset_rele(newnext_ds, FTAG); 2263 if (err) 2264 return (err); 2265 newnext_ds = prev; 2266 } 2267 pa->newnext_obj = newnext_ds->ds_object; 2268 2269 /* compute origin's new unique space */ 2270 pa->unique = 0; 2271 while ((err = bplist_iterate(&newnext_ds->ds_deadlist, 2272 &itor, &bp)) == 0) { 2273 if (bp.blk_birth > origin_ds->ds_phys->ds_prev_snap_txg) 2274 pa->unique += bp_get_dasize(dp->dp_spa, &bp); 2275 } 2276 if (newnext_ds != hds) 2277 dsl_dataset_rele(newnext_ds, FTAG); 2278 if (err != ENOENT) 2279 return (err); 2280 2281 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2282 2283 /* 2284 * Walk the snapshots that we are moving 2285 * 2286 * Compute space to transfer. Each snapshot gave birth to: 2287 * (my used) - (prev's used) + (deadlist's used) 2288 * So a sequence would look like: 2289 * uN - u(N-1) + dN + ... + u1 - u0 + d1 + u0 - 0 + d0 2290 * Which simplifies to: 2291 * uN + dN + ... + d1 + d0 2292 * Note however, if we stop before we reach the ORIGIN we get: 2293 * uN + dN + ... + dM - uM-1 2294 */ 2295 pa->used = origin_ds->ds_phys->ds_used_bytes; 2296 pa->comp = origin_ds->ds_phys->ds_compressed_bytes; 2297 pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 2298 do { 2299 uint64_t val, dlused, dlcomp, dluncomp; 2300 dsl_dataset_t *ds = snap->ds; 2301 2302 /* Check that the snapshot name does not conflict */ 2303 dsl_dataset_name(ds, name); 2304 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2305 if (err == 0) 2306 err = EEXIST; 2307 if (err != ENOENT) 2308 break; 2309 err = 0; 2310 2311 /* The very first snapshot does not have a deadlist */ 2312 if (ds->ds_phys->ds_prev_snap_obj != 0) { 2313 if (err = bplist_space(&ds->ds_deadlist, 2314 &dlused, &dlcomp, &dluncomp)) 2315 break; 2316 pa->used += dlused; 2317 pa->comp += dlcomp; 2318 pa->uncomp += dluncomp; 2319 } 2320 } while (snap = list_next(&pa->snap_list, snap)); 2321 2322 /* 2323 * If we are a clone of a clone then we never reached ORIGIN, 2324 * so we need to subtract out the clone origin's used space. 2325 */ 2326 if (pa->clone_origin) { 2327 pa->used -= pa->clone_origin->ds_phys->ds_used_bytes; 2328 pa->comp -= pa->clone_origin->ds_phys->ds_compressed_bytes; 2329 pa->uncomp -= pa->clone_origin->ds_phys->ds_uncompressed_bytes; 2330 } 2331 2332 kmem_free(name, MAXPATHLEN); 2333 2334 /* Check that there is enough space here */ 2335 if (err == 0) { 2336 dsl_dir_t *odd = origin_ds->ds_dir; 2337 err = dsl_dir_transfer_possible(odd, hds->ds_dir, pa->used); 2338 } 2339 2340 return (err); 2341 } 2342 2343 static void 2344 dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2345 { 2346 dsl_dataset_t *hds = arg1; 2347 struct promotearg *pa = arg2; 2348 struct promotenode *snap = list_head(&pa->snap_list); 2349 dsl_dataset_t *origin_ds = snap->ds; 2350 dsl_dir_t *dd = hds->ds_dir; 2351 dsl_pool_t *dp = hds->ds_dir->dd_pool; 2352 dsl_dir_t *odd = NULL; 2353 char *name; 2354 uint64_t oldnext_obj; 2355 2356 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); 2357 2358 /* 2359 * We need to explicitly open odd, since origin_ds's dd will be 2360 * changing. 2361 */ 2362 VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object, 2363 NULL, FTAG, &odd)); 2364 2365 /* change origin's next snap */ 2366 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2367 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; 2368 origin_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; 2369 2370 /* change the origin's next clone */ 2371 if (origin_ds->ds_phys->ds_next_clones_obj) { 2372 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 2373 origin_ds->ds_phys->ds_next_clones_obj, 2374 pa->newnext_obj, tx)); 2375 VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset, 2376 origin_ds->ds_phys->ds_next_clones_obj, 2377 oldnext_obj, tx)); 2378 } 2379 2380 /* change origin */ 2381 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2382 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 2383 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 2384 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2385 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 2386 2387 /* move snapshots to this dir */ 2388 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2389 do { 2390 dsl_dataset_t *ds = snap->ds; 2391 2392 /* unregister props as dsl_dir is changing */ 2393 if (ds->ds_user_ptr) { 2394 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 2395 ds->ds_user_ptr = NULL; 2396 } 2397 /* move snap name entry */ 2398 dsl_dataset_name(ds, name); 2399 VERIFY(0 == dsl_dataset_snap_remove(pa->old_head, 2400 ds->ds_snapname, tx)); 2401 VERIFY(0 == zap_add(dp->dp_meta_objset, 2402 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2403 8, 1, &ds->ds_object, tx)); 2404 /* change containing dsl_dir */ 2405 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2406 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2407 ds->ds_phys->ds_dir_obj = dd->dd_object; 2408 ASSERT3P(ds->ds_dir, ==, odd); 2409 dsl_dir_close(ds->ds_dir, ds); 2410 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, 2411 NULL, ds, &ds->ds_dir)); 2412 2413 ASSERT3U(dsl_prop_numcb(ds), ==, 0); 2414 } while (snap = list_next(&pa->snap_list, snap)); 2415 2416 /* change space accounting */ 2417 dsl_dir_diduse_space(odd, -pa->used, -pa->comp, -pa->uncomp, tx); 2418 dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); 2419 origin_ds->ds_phys->ds_unique_bytes = pa->unique; 2420 2421 /* log history record */ 2422 spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, 2423 cr, "dataset = %llu", hds->ds_object); 2424 2425 dsl_dir_close(odd, FTAG); 2426 kmem_free(name, MAXPATHLEN); 2427 } 2428 2429 int 2430 dsl_dataset_promote(const char *name) 2431 { 2432 dsl_dataset_t *ds; 2433 dsl_dir_t *dd; 2434 dsl_pool_t *dp; 2435 dmu_object_info_t doi; 2436 struct promotearg pa; 2437 struct promotenode *snap; 2438 uint64_t snap_obj; 2439 uint64_t last_snap = 0; 2440 int err; 2441 2442 err = dsl_dataset_hold(name, FTAG, &ds); 2443 if (err) 2444 return (err); 2445 dd = ds->ds_dir; 2446 dp = dd->dd_pool; 2447 2448 err = dmu_object_info(dp->dp_meta_objset, 2449 ds->ds_phys->ds_snapnames_zapobj, &doi); 2450 if (err) { 2451 dsl_dataset_rele(ds, FTAG); 2452 return (err); 2453 } 2454 2455 /* 2456 * We are going to inherit all the snapshots taken before our 2457 * origin (i.e., our new origin will be our parent's origin). 2458 * Take ownership of them so that we can rename them into our 2459 * namespace. 2460 */ 2461 pa.clone_origin = NULL; 2462 list_create(&pa.snap_list, 2463 sizeof (struct promotenode), offsetof(struct promotenode, link)); 2464 rw_enter(&dp->dp_config_rwlock, RW_READER); 2465 ASSERT(dd->dd_phys->dd_origin_obj != 0); 2466 snap_obj = dd->dd_phys->dd_origin_obj; 2467 while (snap_obj) { 2468 dsl_dataset_t *snapds; 2469 2470 /* 2471 * NB: this would be handled by the below check for 2472 * clone of a clone, but then we'd always own_obj() the 2473 * $ORIGIN, thus causing unnecessary EBUSYs. We don't 2474 * need to set pa.clone_origin because the $ORIGIN has 2475 * no data to account for. 2476 */ 2477 if (dp->dp_origin_snap && 2478 snap_obj == dp->dp_origin_snap->ds_object) 2479 break; 2480 2481 err = dsl_dataset_own_obj(dp, snap_obj, 0, FTAG, &snapds); 2482 if (err == ENOENT) { 2483 /* lost race with snapshot destroy */ 2484 struct promotenode *last = list_tail(&pa.snap_list); 2485 ASSERT(snap_obj != last->ds->ds_phys->ds_prev_snap_obj); 2486 snap_obj = last->ds->ds_phys->ds_prev_snap_obj; 2487 continue; 2488 } else if (err) { 2489 rw_exit(&dp->dp_config_rwlock); 2490 goto out; 2491 } 2492 2493 /* 2494 * We could be a clone of a clone. If we reach our 2495 * parent's branch point, we're done. 2496 */ 2497 if (last_snap && 2498 snapds->ds_phys->ds_next_snap_obj != last_snap) { 2499 pa.clone_origin = snapds; 2500 break; 2501 } 2502 2503 snap = kmem_alloc(sizeof (struct promotenode), KM_SLEEP); 2504 snap->ds = snapds; 2505 list_insert_tail(&pa.snap_list, snap); 2506 last_snap = snap_obj; 2507 snap_obj = snap->ds->ds_phys->ds_prev_snap_obj; 2508 } 2509 snap = list_head(&pa.snap_list); 2510 ASSERT(snap != NULL); 2511 err = dsl_dataset_hold_obj(dp, 2512 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &pa.old_head); 2513 rw_exit(&dp->dp_config_rwlock); 2514 2515 if (err) 2516 goto out; 2517 2518 /* 2519 * Add in 128x the snapnames zapobj size, since we will be moving 2520 * a bunch of snapnames to the promoted ds, and dirtying their 2521 * bonus buffers. 2522 */ 2523 err = dsl_sync_task_do(dp, dsl_dataset_promote_check, 2524 dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); 2525 2526 dsl_dataset_rele(pa.old_head, FTAG); 2527 out: 2528 while ((snap = list_tail(&pa.snap_list)) != NULL) { 2529 list_remove(&pa.snap_list, snap); 2530 dsl_dataset_disown(snap->ds, FTAG); 2531 kmem_free(snap, sizeof (struct promotenode)); 2532 } 2533 list_destroy(&pa.snap_list); 2534 if (pa.clone_origin) 2535 dsl_dataset_disown(pa.clone_origin, FTAG); 2536 dsl_dataset_rele(ds, FTAG); 2537 return (err); 2538 } 2539 2540 struct cloneswaparg { 2541 dsl_dataset_t *cds; /* clone dataset */ 2542 dsl_dataset_t *ohds; /* origin's head dataset */ 2543 boolean_t force; 2544 int64_t unused_refres_delta; /* change in unconsumed refreservation */ 2545 }; 2546 2547 /* ARGSUSED */ 2548 static int 2549 dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx) 2550 { 2551 struct cloneswaparg *csa = arg1; 2552 2553 /* they should both be heads */ 2554 if (dsl_dataset_is_snapshot(csa->cds) || 2555 dsl_dataset_is_snapshot(csa->ohds)) 2556 return (EINVAL); 2557 2558 /* the branch point should be just before them */ 2559 if (csa->cds->ds_prev != csa->ohds->ds_prev) 2560 return (EINVAL); 2561 2562 /* cds should be the clone */ 2563 if (csa->cds->ds_prev->ds_phys->ds_next_snap_obj != 2564 csa->ohds->ds_object) 2565 return (EINVAL); 2566 2567 /* the clone should be a child of the origin */ 2568 if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir) 2569 return (EINVAL); 2570 2571 /* ohds shouldn't be modified unless 'force' */ 2572 if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds)) 2573 return (ETXTBSY); 2574 2575 /* adjust amount of any unconsumed refreservation */ 2576 csa->unused_refres_delta = 2577 (int64_t)MIN(csa->ohds->ds_reserved, 2578 csa->ohds->ds_phys->ds_unique_bytes) - 2579 (int64_t)MIN(csa->ohds->ds_reserved, 2580 csa->cds->ds_phys->ds_unique_bytes); 2581 2582 if (csa->unused_refres_delta > 0 && 2583 csa->unused_refres_delta > 2584 dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE)) 2585 return (ENOSPC); 2586 2587 return (0); 2588 } 2589 2590 /* ARGSUSED */ 2591 static void 2592 dsl_dataset_clone_swap_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2593 { 2594 struct cloneswaparg *csa = arg1; 2595 dsl_pool_t *dp = csa->cds->ds_dir->dd_pool; 2596 uint64_t itor = 0; 2597 blkptr_t bp; 2598 uint64_t unique = 0; 2599 int err; 2600 2601 ASSERT(csa->cds->ds_reserved == 0); 2602 ASSERT(csa->cds->ds_quota == csa->ohds->ds_quota); 2603 2604 dmu_buf_will_dirty(csa->cds->ds_dbuf, tx); 2605 dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx); 2606 dmu_buf_will_dirty(csa->cds->ds_prev->ds_dbuf, tx); 2607 2608 if (csa->cds->ds_user_ptr != NULL) { 2609 csa->cds->ds_user_evict_func(csa->cds, csa->cds->ds_user_ptr); 2610 csa->cds->ds_user_ptr = NULL; 2611 } 2612 2613 if (csa->ohds->ds_user_ptr != NULL) { 2614 csa->ohds->ds_user_evict_func(csa->ohds, 2615 csa->ohds->ds_user_ptr); 2616 csa->ohds->ds_user_ptr = NULL; 2617 } 2618 2619 /* compute unique space */ 2620 while ((err = bplist_iterate(&csa->cds->ds_deadlist, 2621 &itor, &bp)) == 0) { 2622 if (bp.blk_birth > csa->cds->ds_prev->ds_phys->ds_prev_snap_txg) 2623 unique += bp_get_dasize(dp->dp_spa, &bp); 2624 } 2625 VERIFY(err == ENOENT); 2626 2627 /* reset origin's unique bytes */ 2628 csa->cds->ds_prev->ds_phys->ds_unique_bytes = unique; 2629 2630 /* swap blkptrs */ 2631 { 2632 blkptr_t tmp; 2633 tmp = csa->ohds->ds_phys->ds_bp; 2634 csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp; 2635 csa->cds->ds_phys->ds_bp = tmp; 2636 } 2637 2638 /* set dd_*_bytes */ 2639 { 2640 int64_t dused, dcomp, duncomp; 2641 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2642 uint64_t odl_used, odl_comp, odl_uncomp; 2643 2644 VERIFY(0 == bplist_space(&csa->cds->ds_deadlist, &cdl_used, 2645 &cdl_comp, &cdl_uncomp)); 2646 VERIFY(0 == bplist_space(&csa->ohds->ds_deadlist, &odl_used, 2647 &odl_comp, &odl_uncomp)); 2648 dused = csa->cds->ds_phys->ds_used_bytes + cdl_used - 2649 (csa->ohds->ds_phys->ds_used_bytes + odl_used); 2650 dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp - 2651 (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp); 2652 duncomp = csa->cds->ds_phys->ds_uncompressed_bytes + 2653 cdl_uncomp - 2654 (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2655 2656 dsl_dir_diduse_space(csa->ohds->ds_dir, 2657 dused, dcomp, duncomp, tx); 2658 dsl_dir_diduse_space(csa->cds->ds_dir, 2659 -dused, -dcomp, -duncomp, tx); 2660 } 2661 2662 #define SWITCH64(x, y) \ 2663 { \ 2664 uint64_t __tmp = (x); \ 2665 (x) = (y); \ 2666 (y) = __tmp; \ 2667 } 2668 2669 /* swap ds_*_bytes */ 2670 SWITCH64(csa->ohds->ds_phys->ds_used_bytes, 2671 csa->cds->ds_phys->ds_used_bytes); 2672 SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes, 2673 csa->cds->ds_phys->ds_compressed_bytes); 2674 SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes, 2675 csa->cds->ds_phys->ds_uncompressed_bytes); 2676 SWITCH64(csa->ohds->ds_phys->ds_unique_bytes, 2677 csa->cds->ds_phys->ds_unique_bytes); 2678 2679 /* apply any parent delta for change in unconsumed refreservation */ 2680 dsl_dir_diduse_space(csa->ohds->ds_dir, csa->unused_refres_delta, 2681 0, 0, tx); 2682 2683 /* swap deadlists */ 2684 bplist_close(&csa->cds->ds_deadlist); 2685 bplist_close(&csa->ohds->ds_deadlist); 2686 SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj, 2687 csa->cds->ds_phys->ds_deadlist_obj); 2688 VERIFY(0 == bplist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset, 2689 csa->cds->ds_phys->ds_deadlist_obj)); 2690 VERIFY(0 == bplist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset, 2691 csa->ohds->ds_phys->ds_deadlist_obj)); 2692 } 2693 2694 /* 2695 * Swap 'clone' with its origin head file system. Used at the end 2696 * of "online recv" to swizzle the file system to the new version. 2697 */ 2698 int 2699 dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, 2700 boolean_t force) 2701 { 2702 struct cloneswaparg csa; 2703 int error; 2704 2705 ASSERT(clone->ds_owner); 2706 ASSERT(origin_head->ds_owner); 2707 retry: 2708 /* Need exclusive access for the swap */ 2709 rw_enter(&clone->ds_rwlock, RW_WRITER); 2710 if (!rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) { 2711 rw_exit(&clone->ds_rwlock); 2712 rw_enter(&origin_head->ds_rwlock, RW_WRITER); 2713 if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) { 2714 rw_exit(&origin_head->ds_rwlock); 2715 goto retry; 2716 } 2717 } 2718 csa.cds = clone; 2719 csa.ohds = origin_head; 2720 csa.force = force; 2721 error = dsl_sync_task_do(clone->ds_dir->dd_pool, 2722 dsl_dataset_clone_swap_check, 2723 dsl_dataset_clone_swap_sync, &csa, NULL, 9); 2724 return (error); 2725 } 2726 2727 /* 2728 * Given a pool name and a dataset object number in that pool, 2729 * return the name of that dataset. 2730 */ 2731 int 2732 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2733 { 2734 spa_t *spa; 2735 dsl_pool_t *dp; 2736 dsl_dataset_t *ds; 2737 int error; 2738 2739 if ((error = spa_open(pname, &spa, FTAG)) != 0) 2740 return (error); 2741 dp = spa_get_dsl(spa); 2742 rw_enter(&dp->dp_config_rwlock, RW_READER); 2743 if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) { 2744 dsl_dataset_name(ds, buf); 2745 dsl_dataset_rele(ds, FTAG); 2746 } 2747 rw_exit(&dp->dp_config_rwlock); 2748 spa_close(spa, FTAG); 2749 2750 return (error); 2751 } 2752 2753 int 2754 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2755 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2756 { 2757 int error = 0; 2758 2759 ASSERT3S(asize, >, 0); 2760 2761 /* 2762 * *ref_rsrv is the portion of asize that will come from any 2763 * unconsumed refreservation space. 2764 */ 2765 *ref_rsrv = 0; 2766 2767 mutex_enter(&ds->ds_lock); 2768 /* 2769 * Make a space adjustment for reserved bytes. 2770 */ 2771 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2772 ASSERT3U(*used, >=, 2773 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2774 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2775 *ref_rsrv = 2776 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2777 } 2778 2779 if (!check_quota || ds->ds_quota == 0) { 2780 mutex_exit(&ds->ds_lock); 2781 return (0); 2782 } 2783 /* 2784 * If they are requesting more space, and our current estimate 2785 * is over quota, they get to try again unless the actual 2786 * on-disk is over quota and there are no pending changes (which 2787 * may free up space for us). 2788 */ 2789 if (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) { 2790 if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota) 2791 error = ERESTART; 2792 else 2793 error = EDQUOT; 2794 } 2795 mutex_exit(&ds->ds_lock); 2796 2797 return (error); 2798 } 2799 2800 /* ARGSUSED */ 2801 static int 2802 dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) 2803 { 2804 dsl_dataset_t *ds = arg1; 2805 uint64_t *quotap = arg2; 2806 uint64_t new_quota = *quotap; 2807 2808 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA) 2809 return (ENOTSUP); 2810 2811 if (new_quota == 0) 2812 return (0); 2813 2814 if (new_quota < ds->ds_phys->ds_used_bytes || 2815 new_quota < ds->ds_reserved) 2816 return (ENOSPC); 2817 2818 return (0); 2819 } 2820 2821 /* ARGSUSED */ 2822 void 2823 dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2824 { 2825 dsl_dataset_t *ds = arg1; 2826 uint64_t *quotap = arg2; 2827 uint64_t new_quota = *quotap; 2828 2829 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2830 2831 ds->ds_quota = new_quota; 2832 2833 dsl_prop_set_uint64_sync(ds->ds_dir, "refquota", new_quota, cr, tx); 2834 2835 spa_history_internal_log(LOG_DS_REFQUOTA, ds->ds_dir->dd_pool->dp_spa, 2836 tx, cr, "%lld dataset = %llu ", 2837 (longlong_t)new_quota, ds->ds_object); 2838 } 2839 2840 int 2841 dsl_dataset_set_quota(const char *dsname, uint64_t quota) 2842 { 2843 dsl_dataset_t *ds; 2844 int err; 2845 2846 err = dsl_dataset_hold(dsname, FTAG, &ds); 2847 if (err) 2848 return (err); 2849 2850 if (quota != ds->ds_quota) { 2851 /* 2852 * If someone removes a file, then tries to set the quota, we 2853 * want to make sure the file freeing takes effect. 2854 */ 2855 txg_wait_open(ds->ds_dir->dd_pool, 0); 2856 2857 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2858 dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync, 2859 ds, "a, 0); 2860 } 2861 dsl_dataset_rele(ds, FTAG); 2862 return (err); 2863 } 2864 2865 static int 2866 dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) 2867 { 2868 dsl_dataset_t *ds = arg1; 2869 uint64_t *reservationp = arg2; 2870 uint64_t new_reservation = *reservationp; 2871 int64_t delta; 2872 uint64_t unique; 2873 2874 if (new_reservation > INT64_MAX) 2875 return (EOVERFLOW); 2876 2877 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < 2878 SPA_VERSION_REFRESERVATION) 2879 return (ENOTSUP); 2880 2881 if (dsl_dataset_is_snapshot(ds)) 2882 return (EINVAL); 2883 2884 /* 2885 * If we are doing the preliminary check in open context, the 2886 * space estimates may be inaccurate. 2887 */ 2888 if (!dmu_tx_is_syncing(tx)) 2889 return (0); 2890 2891 mutex_enter(&ds->ds_lock); 2892 unique = dsl_dataset_unique(ds); 2893 delta = MAX(unique, new_reservation) - MAX(unique, ds->ds_reserved); 2894 mutex_exit(&ds->ds_lock); 2895 2896 if (delta > 0 && 2897 delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 2898 return (ENOSPC); 2899 if (delta > 0 && ds->ds_quota > 0 && 2900 new_reservation > ds->ds_quota) 2901 return (ENOSPC); 2902 2903 return (0); 2904 } 2905 2906 /* ARGSUSED */ 2907 static void 2908 dsl_dataset_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, 2909 dmu_tx_t *tx) 2910 { 2911 dsl_dataset_t *ds = arg1; 2912 uint64_t *reservationp = arg2; 2913 uint64_t new_reservation = *reservationp; 2914 uint64_t unique; 2915 int64_t delta; 2916 2917 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2918 2919 mutex_enter(&ds->ds_lock); 2920 unique = dsl_dataset_unique(ds); 2921 delta = MAX(0, (int64_t)(new_reservation - unique)) - 2922 MAX(0, (int64_t)(ds->ds_reserved - unique)); 2923 ds->ds_reserved = new_reservation; 2924 mutex_exit(&ds->ds_lock); 2925 2926 dsl_prop_set_uint64_sync(ds->ds_dir, "refreservation", 2927 new_reservation, cr, tx); 2928 2929 dsl_dir_diduse_space(ds->ds_dir, delta, 0, 0, tx); 2930 2931 spa_history_internal_log(LOG_DS_REFRESERV, 2932 ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu", 2933 (longlong_t)new_reservation, 2934 ds->ds_dir->dd_phys->dd_head_dataset_obj); 2935 } 2936 2937 int 2938 dsl_dataset_set_reservation(const char *dsname, uint64_t reservation) 2939 { 2940 dsl_dataset_t *ds; 2941 int err; 2942 2943 err = dsl_dataset_hold(dsname, FTAG, &ds); 2944 if (err) 2945 return (err); 2946 2947 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2948 dsl_dataset_set_reservation_check, 2949 dsl_dataset_set_reservation_sync, ds, &reservation, 0); 2950 dsl_dataset_rele(ds, FTAG); 2951 return (err); 2952 } 2953