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 #include <sys/dmu_objset.h> 27 #include <sys/dsl_dataset.h> 28 #include <sys/dsl_dir.h> 29 #include <sys/dsl_prop.h> 30 #include <sys/dsl_synctask.h> 31 #include <sys/dmu_traverse.h> 32 #include <sys/dmu_tx.h> 33 #include <sys/arc.h> 34 #include <sys/zio.h> 35 #include <sys/zap.h> 36 #include <sys/unique.h> 37 #include <sys/zfs_context.h> 38 #include <sys/zfs_ioctl.h> 39 #include <sys/spa.h> 40 #include <sys/zfs_znode.h> 41 #include <sys/sunddi.h> 42 43 static char *dsl_reaper = "the grim reaper"; 44 45 static dsl_checkfunc_t dsl_dataset_destroy_begin_check; 46 static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; 47 static dsl_checkfunc_t dsl_dataset_rollback_check; 48 static dsl_syncfunc_t dsl_dataset_rollback_sync; 49 static dsl_syncfunc_t dsl_dataset_set_reservation_sync; 50 51 #define DS_REF_MAX (1ULL << 62) 52 53 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 54 55 #define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper) 56 57 58 /* 59 * Figure out how much of this delta should be propogated to the dsl_dir 60 * layer. If there's a refreservation, that space has already been 61 * partially accounted for in our ancestors. 62 */ 63 static int64_t 64 parent_delta(dsl_dataset_t *ds, int64_t delta) 65 { 66 uint64_t old_bytes, new_bytes; 67 68 if (ds->ds_reserved == 0) 69 return (delta); 70 71 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 72 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 73 74 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 75 return (new_bytes - old_bytes); 76 } 77 78 void 79 dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 80 { 81 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 82 int compressed = BP_GET_PSIZE(bp); 83 int uncompressed = BP_GET_UCSIZE(bp); 84 int64_t delta; 85 86 dprintf_bp(bp, "born, ds=%p\n", ds); 87 88 ASSERT(dmu_tx_is_syncing(tx)); 89 /* It could have been compressed away to nothing */ 90 if (BP_IS_HOLE(bp)) 91 return; 92 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 93 ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); 94 if (ds == NULL) { 95 /* 96 * Account for the meta-objset space in its placeholder 97 * dsl_dir. 98 */ 99 ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ 100 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD, 101 used, compressed, uncompressed, tx); 102 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 103 return; 104 } 105 dmu_buf_will_dirty(ds->ds_dbuf, tx); 106 mutex_enter(&ds->ds_dir->dd_lock); 107 mutex_enter(&ds->ds_lock); 108 delta = parent_delta(ds, used); 109 ds->ds_phys->ds_used_bytes += used; 110 ds->ds_phys->ds_compressed_bytes += compressed; 111 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 112 ds->ds_phys->ds_unique_bytes += used; 113 mutex_exit(&ds->ds_lock); 114 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 115 compressed, uncompressed, tx); 116 dsl_dir_transfer_space(ds->ds_dir, used - delta, 117 DD_USED_REFRSRV, DD_USED_HEAD, tx); 118 mutex_exit(&ds->ds_dir->dd_lock); 119 } 120 121 int 122 dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, 123 dmu_tx_t *tx) 124 { 125 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 126 int compressed = BP_GET_PSIZE(bp); 127 int uncompressed = BP_GET_UCSIZE(bp); 128 129 ASSERT(dmu_tx_is_syncing(tx)); 130 /* No block pointer => nothing to free */ 131 if (BP_IS_HOLE(bp)) 132 return (0); 133 134 ASSERT(used > 0); 135 if (ds == NULL) { 136 int err; 137 /* 138 * Account for the meta-objset space in its placeholder 139 * dataset. 140 */ 141 err = dsl_free(pio, tx->tx_pool, 142 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); 143 ASSERT(err == 0); 144 145 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD, 146 -used, -compressed, -uncompressed, tx); 147 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 148 return (used); 149 } 150 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 151 152 ASSERT(!dsl_dataset_is_snapshot(ds)); 153 dmu_buf_will_dirty(ds->ds_dbuf, tx); 154 155 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 156 int err; 157 int64_t delta; 158 159 dprintf_bp(bp, "freeing: %s", ""); 160 err = dsl_free(pio, tx->tx_pool, 161 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT : ARC_WAIT); 162 ASSERT(err == 0); 163 164 mutex_enter(&ds->ds_dir->dd_lock); 165 mutex_enter(&ds->ds_lock); 166 ASSERT(ds->ds_phys->ds_unique_bytes >= used || 167 !DS_UNIQUE_IS_ACCURATE(ds)); 168 delta = parent_delta(ds, -used); 169 ds->ds_phys->ds_unique_bytes -= used; 170 mutex_exit(&ds->ds_lock); 171 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 172 delta, -compressed, -uncompressed, tx); 173 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 174 DD_USED_REFRSRV, DD_USED_HEAD, tx); 175 mutex_exit(&ds->ds_dir->dd_lock); 176 } else { 177 dprintf_bp(bp, "putting on dead list: %s", ""); 178 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); 179 ASSERT3U(ds->ds_prev->ds_object, ==, 180 ds->ds_phys->ds_prev_snap_obj); 181 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 182 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 183 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 184 ds->ds_object && bp->blk_birth > 185 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 186 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 187 mutex_enter(&ds->ds_prev->ds_lock); 188 ds->ds_prev->ds_phys->ds_unique_bytes += used; 189 mutex_exit(&ds->ds_prev->ds_lock); 190 } 191 if (bp->blk_birth > ds->ds_origin_txg) { 192 dsl_dir_transfer_space(ds->ds_dir, used, 193 DD_USED_HEAD, DD_USED_SNAP, tx); 194 } 195 } 196 mutex_enter(&ds->ds_lock); 197 ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); 198 ds->ds_phys->ds_used_bytes -= used; 199 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 200 ds->ds_phys->ds_compressed_bytes -= compressed; 201 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 202 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 203 mutex_exit(&ds->ds_lock); 204 205 return (used); 206 } 207 208 uint64_t 209 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 210 { 211 uint64_t trysnap = 0; 212 213 if (ds == NULL) 214 return (0); 215 /* 216 * The snapshot creation could fail, but that would cause an 217 * incorrect FALSE return, which would only result in an 218 * overestimation of the amount of space that an operation would 219 * consume, which is OK. 220 * 221 * There's also a small window where we could miss a pending 222 * snapshot, because we could set the sync task in the quiescing 223 * phase. So this should only be used as a guess. 224 */ 225 if (ds->ds_trysnap_txg > 226 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 227 trysnap = ds->ds_trysnap_txg; 228 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 229 } 230 231 int 232 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) 233 { 234 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); 235 } 236 237 /* ARGSUSED */ 238 static void 239 dsl_dataset_evict(dmu_buf_t *db, void *dsv) 240 { 241 dsl_dataset_t *ds = dsv; 242 243 ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds)); 244 245 dprintf_ds(ds, "evicting %s\n", ""); 246 247 unique_remove(ds->ds_fsid_guid); 248 249 if (ds->ds_user_ptr != NULL) 250 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 251 252 if (ds->ds_prev) { 253 dsl_dataset_drop_ref(ds->ds_prev, ds); 254 ds->ds_prev = NULL; 255 } 256 257 bplist_close(&ds->ds_deadlist); 258 if (ds->ds_dir) 259 dsl_dir_close(ds->ds_dir, ds); 260 261 ASSERT(!list_link_active(&ds->ds_synced_link)); 262 263 mutex_destroy(&ds->ds_lock); 264 mutex_destroy(&ds->ds_opening_lock); 265 mutex_destroy(&ds->ds_deadlist.bpl_lock); 266 rw_destroy(&ds->ds_rwlock); 267 cv_destroy(&ds->ds_exclusive_cv); 268 269 kmem_free(ds, sizeof (dsl_dataset_t)); 270 } 271 272 static int 273 dsl_dataset_get_snapname(dsl_dataset_t *ds) 274 { 275 dsl_dataset_phys_t *headphys; 276 int err; 277 dmu_buf_t *headdbuf; 278 dsl_pool_t *dp = ds->ds_dir->dd_pool; 279 objset_t *mos = dp->dp_meta_objset; 280 281 if (ds->ds_snapname[0]) 282 return (0); 283 if (ds->ds_phys->ds_next_snap_obj == 0) 284 return (0); 285 286 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 287 FTAG, &headdbuf); 288 if (err) 289 return (err); 290 headphys = headdbuf->db_data; 291 err = zap_value_search(dp->dp_meta_objset, 292 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 293 dmu_buf_rele(headdbuf, FTAG); 294 return (err); 295 } 296 297 static int 298 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 299 { 300 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 301 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 302 matchtype_t mt; 303 int err; 304 305 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 306 mt = MT_FIRST; 307 else 308 mt = MT_EXACT; 309 310 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 311 value, mt, NULL, 0, NULL); 312 if (err == ENOTSUP && mt == MT_FIRST) 313 err = zap_lookup(mos, snapobj, name, 8, 1, value); 314 return (err); 315 } 316 317 static int 318 dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx) 319 { 320 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 321 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 322 matchtype_t mt; 323 int err; 324 325 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 326 mt = MT_FIRST; 327 else 328 mt = MT_EXACT; 329 330 err = zap_remove_norm(mos, snapobj, name, mt, tx); 331 if (err == ENOTSUP && mt == MT_FIRST) 332 err = zap_remove(mos, snapobj, name, tx); 333 return (err); 334 } 335 336 static int 337 dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, void *tag, 338 dsl_dataset_t **dsp) 339 { 340 objset_t *mos = dp->dp_meta_objset; 341 dmu_buf_t *dbuf; 342 dsl_dataset_t *ds; 343 int err; 344 345 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 346 dsl_pool_sync_context(dp)); 347 348 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 349 if (err) 350 return (err); 351 ds = dmu_buf_get_user(dbuf); 352 if (ds == NULL) { 353 dsl_dataset_t *winner; 354 355 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 356 ds->ds_dbuf = dbuf; 357 ds->ds_object = dsobj; 358 ds->ds_phys = dbuf->db_data; 359 360 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 361 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 362 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, 363 NULL); 364 rw_init(&ds->ds_rwlock, 0, 0, 0); 365 cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL); 366 367 err = bplist_open(&ds->ds_deadlist, 368 mos, ds->ds_phys->ds_deadlist_obj); 369 if (err == 0) { 370 err = dsl_dir_open_obj(dp, 371 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 372 } 373 if (err) { 374 /* 375 * we don't really need to close the blist if we 376 * just opened it. 377 */ 378 mutex_destroy(&ds->ds_lock); 379 mutex_destroy(&ds->ds_opening_lock); 380 mutex_destroy(&ds->ds_deadlist.bpl_lock); 381 rw_destroy(&ds->ds_rwlock); 382 cv_destroy(&ds->ds_exclusive_cv); 383 kmem_free(ds, sizeof (dsl_dataset_t)); 384 dmu_buf_rele(dbuf, tag); 385 return (err); 386 } 387 388 if (!dsl_dataset_is_snapshot(ds)) { 389 ds->ds_snapname[0] = '\0'; 390 if (ds->ds_phys->ds_prev_snap_obj) { 391 err = dsl_dataset_get_ref(dp, 392 ds->ds_phys->ds_prev_snap_obj, 393 ds, &ds->ds_prev); 394 } 395 396 if (err == 0 && dsl_dir_is_clone(ds->ds_dir)) { 397 dsl_dataset_t *origin; 398 399 err = dsl_dataset_hold_obj(dp, 400 ds->ds_dir->dd_phys->dd_origin_obj, 401 FTAG, &origin); 402 if (err == 0) { 403 ds->ds_origin_txg = 404 origin->ds_phys->ds_creation_txg; 405 dsl_dataset_rele(origin, FTAG); 406 } 407 } 408 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { 409 err = dsl_dataset_get_snapname(ds); 410 } 411 412 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 413 /* 414 * In sync context, we're called with either no lock 415 * or with the write lock. If we're not syncing, 416 * we're always called with the read lock held. 417 */ 418 boolean_t need_lock = 419 !RW_WRITE_HELD(&dp->dp_config_rwlock) && 420 dsl_pool_sync_context(dp); 421 422 if (need_lock) 423 rw_enter(&dp->dp_config_rwlock, RW_READER); 424 425 err = dsl_prop_get_ds(ds, 426 "refreservation", sizeof (uint64_t), 1, 427 &ds->ds_reserved, NULL); 428 if (err == 0) { 429 err = dsl_prop_get_ds(ds, 430 "refquota", sizeof (uint64_t), 1, 431 &ds->ds_quota, NULL); 432 } 433 434 if (need_lock) 435 rw_exit(&dp->dp_config_rwlock); 436 } else { 437 ds->ds_reserved = ds->ds_quota = 0; 438 } 439 440 if (err == 0) { 441 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, 442 dsl_dataset_evict); 443 } 444 if (err || winner) { 445 bplist_close(&ds->ds_deadlist); 446 if (ds->ds_prev) 447 dsl_dataset_drop_ref(ds->ds_prev, ds); 448 dsl_dir_close(ds->ds_dir, ds); 449 mutex_destroy(&ds->ds_lock); 450 mutex_destroy(&ds->ds_opening_lock); 451 mutex_destroy(&ds->ds_deadlist.bpl_lock); 452 rw_destroy(&ds->ds_rwlock); 453 cv_destroy(&ds->ds_exclusive_cv); 454 kmem_free(ds, sizeof (dsl_dataset_t)); 455 if (err) { 456 dmu_buf_rele(dbuf, tag); 457 return (err); 458 } 459 ds = winner; 460 } else { 461 ds->ds_fsid_guid = 462 unique_insert(ds->ds_phys->ds_fsid_guid); 463 } 464 } 465 ASSERT3P(ds->ds_dbuf, ==, dbuf); 466 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 467 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || 468 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 469 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 470 mutex_enter(&ds->ds_lock); 471 if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) { 472 mutex_exit(&ds->ds_lock); 473 dmu_buf_rele(ds->ds_dbuf, tag); 474 return (ENOENT); 475 } 476 mutex_exit(&ds->ds_lock); 477 *dsp = ds; 478 return (0); 479 } 480 481 static int 482 dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag) 483 { 484 dsl_pool_t *dp = ds->ds_dir->dd_pool; 485 486 /* 487 * In syncing context we don't want the rwlock lock: there 488 * may be an existing writer waiting for sync phase to 489 * finish. We don't need to worry about such writers, since 490 * sync phase is single-threaded, so the writer can't be 491 * doing anything while we are active. 492 */ 493 if (dsl_pool_sync_context(dp)) { 494 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 495 return (0); 496 } 497 498 /* 499 * Normal users will hold the ds_rwlock as a READER until they 500 * are finished (i.e., call dsl_dataset_rele()). "Owners" will 501 * drop their READER lock after they set the ds_owner field. 502 * 503 * If the dataset is being destroyed, the destroy thread will 504 * obtain a WRITER lock for exclusive access after it's done its 505 * open-context work and then change the ds_owner to 506 * dsl_reaper once destruction is assured. So threads 507 * may block here temporarily, until the "destructability" of 508 * the dataset is determined. 509 */ 510 ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock)); 511 mutex_enter(&ds->ds_lock); 512 while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) { 513 rw_exit(&dp->dp_config_rwlock); 514 cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock); 515 if (DSL_DATASET_IS_DESTROYED(ds)) { 516 mutex_exit(&ds->ds_lock); 517 dsl_dataset_drop_ref(ds, tag); 518 rw_enter(&dp->dp_config_rwlock, RW_READER); 519 return (ENOENT); 520 } 521 rw_enter(&dp->dp_config_rwlock, RW_READER); 522 } 523 mutex_exit(&ds->ds_lock); 524 return (0); 525 } 526 527 int 528 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 529 dsl_dataset_t **dsp) 530 { 531 int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp); 532 533 if (err) 534 return (err); 535 return (dsl_dataset_hold_ref(*dsp, tag)); 536 } 537 538 int 539 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, int flags, void *owner, 540 dsl_dataset_t **dsp) 541 { 542 int err = dsl_dataset_hold_obj(dp, dsobj, owner, dsp); 543 544 ASSERT(DS_MODE_TYPE(flags) != DS_MODE_USER); 545 546 if (err) 547 return (err); 548 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 549 dsl_dataset_rele(*dsp, owner); 550 return (EBUSY); 551 } 552 return (0); 553 } 554 555 int 556 dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp) 557 { 558 dsl_dir_t *dd; 559 dsl_pool_t *dp; 560 const char *snapname; 561 uint64_t obj; 562 int err = 0; 563 564 err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname); 565 if (err) 566 return (err); 567 568 dp = dd->dd_pool; 569 obj = dd->dd_phys->dd_head_dataset_obj; 570 rw_enter(&dp->dp_config_rwlock, RW_READER); 571 if (obj) 572 err = dsl_dataset_get_ref(dp, obj, tag, dsp); 573 else 574 err = ENOENT; 575 if (err) 576 goto out; 577 578 err = dsl_dataset_hold_ref(*dsp, tag); 579 580 /* we may be looking for a snapshot */ 581 if (err == 0 && snapname != NULL) { 582 dsl_dataset_t *ds = NULL; 583 584 if (*snapname++ != '@') { 585 dsl_dataset_rele(*dsp, tag); 586 err = ENOENT; 587 goto out; 588 } 589 590 dprintf("looking for snapshot '%s'\n", snapname); 591 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 592 if (err == 0) 593 err = dsl_dataset_get_ref(dp, obj, tag, &ds); 594 dsl_dataset_rele(*dsp, tag); 595 596 ASSERT3U((err == 0), ==, (ds != NULL)); 597 598 if (ds) { 599 mutex_enter(&ds->ds_lock); 600 if (ds->ds_snapname[0] == 0) 601 (void) strlcpy(ds->ds_snapname, snapname, 602 sizeof (ds->ds_snapname)); 603 mutex_exit(&ds->ds_lock); 604 err = dsl_dataset_hold_ref(ds, tag); 605 *dsp = err ? NULL : ds; 606 } 607 } 608 out: 609 rw_exit(&dp->dp_config_rwlock); 610 dsl_dir_close(dd, FTAG); 611 return (err); 612 } 613 614 int 615 dsl_dataset_own(const char *name, int flags, void *owner, dsl_dataset_t **dsp) 616 { 617 int err = dsl_dataset_hold(name, owner, dsp); 618 if (err) 619 return (err); 620 if ((*dsp)->ds_phys->ds_num_children > 0 && 621 !DS_MODE_IS_READONLY(flags)) { 622 dsl_dataset_rele(*dsp, owner); 623 return (EROFS); 624 } 625 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 626 dsl_dataset_rele(*dsp, owner); 627 return (EBUSY); 628 } 629 return (0); 630 } 631 632 void 633 dsl_dataset_name(dsl_dataset_t *ds, char *name) 634 { 635 if (ds == NULL) { 636 (void) strcpy(name, "mos"); 637 } else { 638 dsl_dir_name(ds->ds_dir, name); 639 VERIFY(0 == dsl_dataset_get_snapname(ds)); 640 if (ds->ds_snapname[0]) { 641 (void) strcat(name, "@"); 642 /* 643 * We use a "recursive" mutex so that we 644 * can call dprintf_ds() with ds_lock held. 645 */ 646 if (!MUTEX_HELD(&ds->ds_lock)) { 647 mutex_enter(&ds->ds_lock); 648 (void) strcat(name, ds->ds_snapname); 649 mutex_exit(&ds->ds_lock); 650 } else { 651 (void) strcat(name, ds->ds_snapname); 652 } 653 } 654 } 655 } 656 657 static int 658 dsl_dataset_namelen(dsl_dataset_t *ds) 659 { 660 int result; 661 662 if (ds == NULL) { 663 result = 3; /* "mos" */ 664 } else { 665 result = dsl_dir_namelen(ds->ds_dir); 666 VERIFY(0 == dsl_dataset_get_snapname(ds)); 667 if (ds->ds_snapname[0]) { 668 ++result; /* adding one for the @-sign */ 669 if (!MUTEX_HELD(&ds->ds_lock)) { 670 mutex_enter(&ds->ds_lock); 671 result += strlen(ds->ds_snapname); 672 mutex_exit(&ds->ds_lock); 673 } else { 674 result += strlen(ds->ds_snapname); 675 } 676 } 677 } 678 679 return (result); 680 } 681 682 void 683 dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag) 684 { 685 dmu_buf_rele(ds->ds_dbuf, tag); 686 } 687 688 void 689 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 690 { 691 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) { 692 rw_exit(&ds->ds_rwlock); 693 } 694 dsl_dataset_drop_ref(ds, tag); 695 } 696 697 void 698 dsl_dataset_disown(dsl_dataset_t *ds, void *owner) 699 { 700 ASSERT((ds->ds_owner == owner && ds->ds_dbuf) || 701 (DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL)); 702 703 mutex_enter(&ds->ds_lock); 704 ds->ds_owner = NULL; 705 if (RW_WRITE_HELD(&ds->ds_rwlock)) { 706 rw_exit(&ds->ds_rwlock); 707 cv_broadcast(&ds->ds_exclusive_cv); 708 } 709 mutex_exit(&ds->ds_lock); 710 if (ds->ds_dbuf) 711 dsl_dataset_drop_ref(ds, owner); 712 else 713 dsl_dataset_evict(ds->ds_dbuf, ds); 714 } 715 716 boolean_t 717 dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *owner) 718 { 719 boolean_t gotit = FALSE; 720 721 mutex_enter(&ds->ds_lock); 722 if (ds->ds_owner == NULL && 723 (!DS_IS_INCONSISTENT(ds) || inconsistentok)) { 724 ds->ds_owner = owner; 725 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) 726 rw_exit(&ds->ds_rwlock); 727 gotit = TRUE; 728 } 729 mutex_exit(&ds->ds_lock); 730 return (gotit); 731 } 732 733 void 734 dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner) 735 { 736 ASSERT3P(owner, ==, ds->ds_owner); 737 if (!RW_WRITE_HELD(&ds->ds_rwlock)) 738 rw_enter(&ds->ds_rwlock, RW_WRITER); 739 } 740 741 uint64_t 742 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 743 uint64_t flags, dmu_tx_t *tx) 744 { 745 dsl_pool_t *dp = dd->dd_pool; 746 dmu_buf_t *dbuf; 747 dsl_dataset_phys_t *dsphys; 748 uint64_t dsobj; 749 objset_t *mos = dp->dp_meta_objset; 750 751 if (origin == NULL) 752 origin = dp->dp_origin_snap; 753 754 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 755 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 756 ASSERT(dmu_tx_is_syncing(tx)); 757 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 758 759 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 760 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 761 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 762 dmu_buf_will_dirty(dbuf, tx); 763 dsphys = dbuf->db_data; 764 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 765 dsphys->ds_dir_obj = dd->dd_object; 766 dsphys->ds_flags = flags; 767 dsphys->ds_fsid_guid = unique_create(); 768 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 769 sizeof (dsphys->ds_guid)); 770 dsphys->ds_snapnames_zapobj = 771 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 772 DMU_OT_NONE, 0, tx); 773 dsphys->ds_creation_time = gethrestime_sec(); 774 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 775 dsphys->ds_deadlist_obj = 776 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 777 778 if (origin) { 779 dsphys->ds_prev_snap_obj = origin->ds_object; 780 dsphys->ds_prev_snap_txg = 781 origin->ds_phys->ds_creation_txg; 782 dsphys->ds_used_bytes = 783 origin->ds_phys->ds_used_bytes; 784 dsphys->ds_compressed_bytes = 785 origin->ds_phys->ds_compressed_bytes; 786 dsphys->ds_uncompressed_bytes = 787 origin->ds_phys->ds_uncompressed_bytes; 788 dsphys->ds_bp = origin->ds_phys->ds_bp; 789 dsphys->ds_flags |= origin->ds_phys->ds_flags; 790 791 dmu_buf_will_dirty(origin->ds_dbuf, tx); 792 origin->ds_phys->ds_num_children++; 793 794 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 795 if (origin->ds_phys->ds_next_clones_obj == 0) { 796 origin->ds_phys->ds_next_clones_obj = 797 zap_create(mos, 798 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 799 } 800 VERIFY(0 == zap_add_int(mos, 801 origin->ds_phys->ds_next_clones_obj, 802 dsobj, tx)); 803 } 804 805 dmu_buf_will_dirty(dd->dd_dbuf, tx); 806 dd->dd_phys->dd_origin_obj = origin->ds_object; 807 } 808 809 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 810 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 811 812 dmu_buf_rele(dbuf, FTAG); 813 814 dmu_buf_will_dirty(dd->dd_dbuf, tx); 815 dd->dd_phys->dd_head_dataset_obj = dsobj; 816 817 return (dsobj); 818 } 819 820 uint64_t 821 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 822 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 823 { 824 dsl_pool_t *dp = pdd->dd_pool; 825 uint64_t dsobj, ddobj; 826 dsl_dir_t *dd; 827 828 ASSERT(lastname[0] != '@'); 829 830 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 831 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); 832 833 dsobj = dsl_dataset_create_sync_dd(dd, origin, flags, tx); 834 835 dsl_deleg_set_create_perms(dd, tx, cr); 836 837 dsl_dir_close(dd, FTAG); 838 839 return (dsobj); 840 } 841 842 struct destroyarg { 843 dsl_sync_task_group_t *dstg; 844 char *snapname; 845 char *failed; 846 }; 847 848 static int 849 dsl_snapshot_destroy_one(char *name, void *arg) 850 { 851 struct destroyarg *da = arg; 852 dsl_dataset_t *ds; 853 char *cp; 854 int err; 855 856 (void) strcat(name, "@"); 857 (void) strcat(name, da->snapname); 858 err = dsl_dataset_own(name, DS_MODE_READONLY | DS_MODE_INCONSISTENT, 859 da->dstg, &ds); 860 cp = strchr(name, '@'); 861 *cp = '\0'; 862 if (err == 0) { 863 dsl_dataset_make_exclusive(ds, da->dstg); 864 if (ds->ds_user_ptr) { 865 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 866 ds->ds_user_ptr = NULL; 867 } 868 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, 869 dsl_dataset_destroy_sync, ds, da->dstg, 0); 870 } else if (err == ENOENT) { 871 err = 0; 872 } else { 873 (void) strcpy(da->failed, name); 874 } 875 return (err); 876 } 877 878 /* 879 * Destroy 'snapname' in all descendants of 'fsname'. 880 */ 881 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy 882 int 883 dsl_snapshots_destroy(char *fsname, char *snapname) 884 { 885 int err; 886 struct destroyarg da; 887 dsl_sync_task_t *dst; 888 spa_t *spa; 889 890 err = spa_open(fsname, &spa, FTAG); 891 if (err) 892 return (err); 893 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 894 da.snapname = snapname; 895 da.failed = fsname; 896 897 err = dmu_objset_find(fsname, 898 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); 899 900 if (err == 0) 901 err = dsl_sync_task_group_wait(da.dstg); 902 903 for (dst = list_head(&da.dstg->dstg_tasks); dst; 904 dst = list_next(&da.dstg->dstg_tasks, dst)) { 905 dsl_dataset_t *ds = dst->dst_arg1; 906 /* 907 * Return the file system name that triggered the error 908 */ 909 if (dst->dst_err) { 910 dsl_dataset_name(ds, fsname); 911 *strchr(fsname, '@') = '\0'; 912 } 913 dsl_dataset_disown(ds, da.dstg); 914 } 915 916 dsl_sync_task_group_destroy(da.dstg); 917 spa_close(spa, FTAG); 918 return (err); 919 } 920 921 /* 922 * ds must be opened as OWNER. On return (whether successful or not), 923 * ds will be closed and caller can no longer dereference it. 924 */ 925 int 926 dsl_dataset_destroy(dsl_dataset_t *ds, void *tag) 927 { 928 int err; 929 dsl_sync_task_group_t *dstg; 930 objset_t *os; 931 dsl_dir_t *dd; 932 uint64_t obj; 933 934 if (dsl_dataset_is_snapshot(ds)) { 935 /* Destroying a snapshot is simpler */ 936 dsl_dataset_make_exclusive(ds, tag); 937 938 if (ds->ds_user_ptr) { 939 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 940 ds->ds_user_ptr = NULL; 941 } 942 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 943 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, 944 ds, tag, 0); 945 goto out; 946 } 947 948 dd = ds->ds_dir; 949 950 /* 951 * Check for errors and mark this ds as inconsistent, in 952 * case we crash while freeing the objects. 953 */ 954 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, 955 dsl_dataset_destroy_begin_sync, ds, NULL, 0); 956 if (err) 957 goto out; 958 959 err = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); 960 if (err) 961 goto out; 962 963 /* 964 * remove the objects in open context, so that we won't 965 * have too much to do in syncing context. 966 */ 967 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 968 ds->ds_phys->ds_prev_snap_txg)) { 969 /* 970 * Ignore errors, if there is not enough disk space 971 * we will deal with it in dsl_dataset_destroy_sync(). 972 */ 973 (void) dmu_free_object(os, obj); 974 } 975 976 dmu_objset_close(os); 977 if (err != ESRCH) 978 goto out; 979 980 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 981 err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd); 982 rw_exit(&dd->dd_pool->dp_config_rwlock); 983 984 if (err) 985 goto out; 986 987 if (ds->ds_user_ptr) { 988 /* 989 * We need to sync out all in-flight IO before we try 990 * to evict (the dataset evict func is trying to clear 991 * the cached entries for this dataset in the ARC). 992 */ 993 txg_wait_synced(dd->dd_pool, 0); 994 } 995 996 /* 997 * Blow away the dsl_dir + head dataset. 998 */ 999 dsl_dataset_make_exclusive(ds, tag); 1000 if (ds->ds_user_ptr) { 1001 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 1002 ds->ds_user_ptr = NULL; 1003 } 1004 dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); 1005 dsl_sync_task_create(dstg, dsl_dataset_destroy_check, 1006 dsl_dataset_destroy_sync, ds, tag, 0); 1007 dsl_sync_task_create(dstg, dsl_dir_destroy_check, 1008 dsl_dir_destroy_sync, dd, FTAG, 0); 1009 err = dsl_sync_task_group_wait(dstg); 1010 dsl_sync_task_group_destroy(dstg); 1011 /* if it is successful, dsl_dir_destroy_sync will close the dd */ 1012 if (err) 1013 dsl_dir_close(dd, FTAG); 1014 out: 1015 dsl_dataset_disown(ds, tag); 1016 return (err); 1017 } 1018 1019 int 1020 dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost) 1021 { 1022 int err; 1023 1024 ASSERT(ds->ds_owner); 1025 1026 dsl_dataset_make_exclusive(ds, ds->ds_owner); 1027 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 1028 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, 1029 ds, &ost, 0); 1030 /* drop exclusive access */ 1031 mutex_enter(&ds->ds_lock); 1032 rw_exit(&ds->ds_rwlock); 1033 cv_broadcast(&ds->ds_exclusive_cv); 1034 mutex_exit(&ds->ds_lock); 1035 return (err); 1036 } 1037 1038 void * 1039 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, 1040 void *p, dsl_dataset_evict_func_t func) 1041 { 1042 void *old; 1043 1044 mutex_enter(&ds->ds_lock); 1045 old = ds->ds_user_ptr; 1046 if (old == NULL) { 1047 ds->ds_user_ptr = p; 1048 ds->ds_user_evict_func = func; 1049 } 1050 mutex_exit(&ds->ds_lock); 1051 return (old); 1052 } 1053 1054 void * 1055 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) 1056 { 1057 return (ds->ds_user_ptr); 1058 } 1059 1060 1061 blkptr_t * 1062 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1063 { 1064 return (&ds->ds_phys->ds_bp); 1065 } 1066 1067 void 1068 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1069 { 1070 ASSERT(dmu_tx_is_syncing(tx)); 1071 /* If it's the meta-objset, set dp_meta_rootbp */ 1072 if (ds == NULL) { 1073 tx->tx_pool->dp_meta_rootbp = *bp; 1074 } else { 1075 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1076 ds->ds_phys->ds_bp = *bp; 1077 } 1078 } 1079 1080 spa_t * 1081 dsl_dataset_get_spa(dsl_dataset_t *ds) 1082 { 1083 return (ds->ds_dir->dd_pool->dp_spa); 1084 } 1085 1086 void 1087 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1088 { 1089 dsl_pool_t *dp; 1090 1091 if (ds == NULL) /* this is the meta-objset */ 1092 return; 1093 1094 ASSERT(ds->ds_user_ptr != NULL); 1095 1096 if (ds->ds_phys->ds_next_snap_obj != 0) 1097 panic("dirtying snapshot!"); 1098 1099 dp = ds->ds_dir->dd_pool; 1100 1101 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { 1102 /* up the hold count until we can be written out */ 1103 dmu_buf_add_ref(ds->ds_dbuf, ds); 1104 } 1105 } 1106 1107 /* 1108 * The unique space in the head dataset can be calculated by subtracting 1109 * the space used in the most recent snapshot, that is still being used 1110 * in this file system, from the space currently in use. To figure out 1111 * the space in the most recent snapshot still in use, we need to take 1112 * the total space used in the snapshot and subtract out the space that 1113 * has been freed up since the snapshot was taken. 1114 */ 1115 static void 1116 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1117 { 1118 uint64_t mrs_used; 1119 uint64_t dlused, dlcomp, dluncomp; 1120 1121 ASSERT(ds->ds_object == ds->ds_dir->dd_phys->dd_head_dataset_obj); 1122 1123 if (ds->ds_phys->ds_prev_snap_obj != 0) 1124 mrs_used = ds->ds_prev->ds_phys->ds_used_bytes; 1125 else 1126 mrs_used = 0; 1127 1128 VERIFY(0 == bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, 1129 &dluncomp)); 1130 1131 ASSERT3U(dlused, <=, mrs_used); 1132 ds->ds_phys->ds_unique_bytes = 1133 ds->ds_phys->ds_used_bytes - (mrs_used - dlused); 1134 1135 if (!DS_UNIQUE_IS_ACCURATE(ds) && 1136 spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1137 SPA_VERSION_UNIQUE_ACCURATE) 1138 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1139 } 1140 1141 static uint64_t 1142 dsl_dataset_unique(dsl_dataset_t *ds) 1143 { 1144 if (!DS_UNIQUE_IS_ACCURATE(ds) && !dsl_dataset_is_snapshot(ds)) 1145 dsl_dataset_recalc_head_uniq(ds); 1146 1147 return (ds->ds_phys->ds_unique_bytes); 1148 } 1149 1150 struct killarg { 1151 dsl_dataset_t *ds; 1152 zio_t *zio; 1153 dmu_tx_t *tx; 1154 }; 1155 1156 /* ARGSUSED */ 1157 static int 1158 kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) 1159 { 1160 struct killarg *ka = arg; 1161 blkptr_t *bp = &bc->bc_blkptr; 1162 1163 ASSERT3U(bc->bc_errno, ==, 0); 1164 1165 ASSERT3U(bp->blk_birth, >, ka->ds->ds_phys->ds_prev_snap_txg); 1166 (void) dsl_dataset_block_kill(ka->ds, bp, ka->zio, ka->tx); 1167 1168 return (0); 1169 } 1170 1171 /* ARGSUSED */ 1172 static int 1173 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) 1174 { 1175 dsl_dataset_t *ds = arg1; 1176 dmu_objset_type_t *ost = arg2; 1177 1178 /* 1179 * We can only roll back to emptyness if it is a ZPL objset. 1180 */ 1181 if (*ost != DMU_OST_ZFS && ds->ds_phys->ds_prev_snap_txg == 0) 1182 return (EINVAL); 1183 1184 /* 1185 * This must not be a snapshot. 1186 */ 1187 if (ds->ds_phys->ds_next_snap_obj != 0) 1188 return (EINVAL); 1189 1190 /* 1191 * If we made changes this txg, traverse_dsl_dataset won't find 1192 * them. Try again. 1193 */ 1194 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1195 return (EAGAIN); 1196 1197 return (0); 1198 } 1199 1200 /* ARGSUSED */ 1201 static void 1202 dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1203 { 1204 dsl_dataset_t *ds = arg1; 1205 dmu_objset_type_t *ost = arg2; 1206 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1207 1208 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1209 1210 /* 1211 * Before the roll back destroy the zil. 1212 */ 1213 if (ds->ds_user_ptr != NULL) { 1214 zil_rollback_destroy( 1215 ((objset_impl_t *)ds->ds_user_ptr)->os_zil, tx); 1216 1217 /* 1218 * We need to make sure that the objset_impl_t is reopened after 1219 * we do the rollback, otherwise it will have the wrong 1220 * objset_phys_t. Normally this would happen when this 1221 * dataset-open is closed, thus causing the 1222 * dataset to be immediately evicted. But when doing "zfs recv 1223 * -F", we reopen the objset before that, so that there is no 1224 * window where the dataset is closed and inconsistent. 1225 */ 1226 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 1227 ds->ds_user_ptr = NULL; 1228 } 1229 1230 /* Transfer space that was freed since last snap back to the head. */ 1231 { 1232 uint64_t used; 1233 1234 VERIFY(0 == bplist_space_birthrange(&ds->ds_deadlist, 1235 ds->ds_origin_txg, UINT64_MAX, &used)); 1236 dsl_dir_transfer_space(ds->ds_dir, used, 1237 DD_USED_SNAP, DD_USED_HEAD, tx); 1238 } 1239 1240 /* Zero out the deadlist. */ 1241 bplist_close(&ds->ds_deadlist); 1242 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1243 ds->ds_phys->ds_deadlist_obj = 1244 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1245 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1246 ds->ds_phys->ds_deadlist_obj)); 1247 1248 { 1249 /* Free blkptrs that we gave birth to */ 1250 zio_t *zio; 1251 struct killarg ka; 1252 1253 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, 1254 ZIO_FLAG_MUSTSUCCEED); 1255 ka.ds = ds; 1256 ka.zio = zio; 1257 ka.tx = tx; 1258 (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1259 ADVANCE_POST, kill_blkptr, &ka); 1260 (void) zio_wait(zio); 1261 } 1262 1263 ASSERT(!(ds->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) || 1264 ds->ds_phys->ds_unique_bytes == 0); 1265 1266 if (ds->ds_prev && ds->ds_prev != ds->ds_dir->dd_pool->dp_origin_snap) { 1267 /* Change our contents to that of the prev snapshot */ 1268 1269 ASSERT3U(ds->ds_prev->ds_object, ==, 1270 ds->ds_phys->ds_prev_snap_obj); 1271 ASSERT3U(ds->ds_phys->ds_used_bytes, <=, 1272 ds->ds_prev->ds_phys->ds_used_bytes); 1273 1274 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; 1275 ds->ds_phys->ds_used_bytes = 1276 ds->ds_prev->ds_phys->ds_used_bytes; 1277 ds->ds_phys->ds_compressed_bytes = 1278 ds->ds_prev->ds_phys->ds_compressed_bytes; 1279 ds->ds_phys->ds_uncompressed_bytes = 1280 ds->ds_prev->ds_phys->ds_uncompressed_bytes; 1281 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; 1282 1283 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1284 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1285 ds->ds_prev->ds_phys->ds_unique_bytes = 0; 1286 } 1287 } else { 1288 objset_impl_t *osi; 1289 1290 ASSERT3U(ds->ds_phys->ds_used_bytes, ==, 0); 1291 ASSERT3U(ds->ds_phys->ds_compressed_bytes, ==, 0); 1292 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, ==, 0); 1293 1294 bzero(&ds->ds_phys->ds_bp, sizeof (blkptr_t)); 1295 ds->ds_phys->ds_flags = 0; 1296 ds->ds_phys->ds_unique_bytes = 0; 1297 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1298 SPA_VERSION_UNIQUE_ACCURATE) 1299 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1300 1301 osi = dmu_objset_create_impl(ds->ds_dir->dd_pool->dp_spa, ds, 1302 &ds->ds_phys->ds_bp, *ost, tx); 1303 #ifdef _KERNEL 1304 zfs_create_fs(&osi->os, kcred, NULL, tx); 1305 #endif 1306 } 1307 1308 spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, 1309 tx, cr, "dataset = %llu", ds->ds_object); 1310 } 1311 1312 /* ARGSUSED */ 1313 static int 1314 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) 1315 { 1316 dsl_dataset_t *ds = arg1; 1317 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1318 uint64_t count; 1319 int err; 1320 1321 /* 1322 * Can't delete a head dataset if there are snapshots of it. 1323 * (Except if the only snapshots are from the branch we cloned 1324 * from.) 1325 */ 1326 if (ds->ds_prev != NULL && 1327 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1328 return (EINVAL); 1329 1330 /* 1331 * This is really a dsl_dir thing, but check it here so that 1332 * we'll be less likely to leave this dataset inconsistent & 1333 * nearly destroyed. 1334 */ 1335 err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count); 1336 if (err) 1337 return (err); 1338 if (count != 0) 1339 return (EEXIST); 1340 1341 return (0); 1342 } 1343 1344 /* ARGSUSED */ 1345 static void 1346 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1347 { 1348 dsl_dataset_t *ds = arg1; 1349 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1350 1351 /* Mark it as inconsistent on-disk, in case we crash */ 1352 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1353 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 1354 1355 spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, 1356 cr, "dataset = %llu", ds->ds_object); 1357 } 1358 1359 /* ARGSUSED */ 1360 int 1361 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) 1362 { 1363 dsl_dataset_t *ds = arg1; 1364 1365 /* we have an owner hold, so noone else can destroy us */ 1366 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 1367 1368 /* Can't delete a branch point. */ 1369 if (ds->ds_phys->ds_num_children > 1) 1370 return (EEXIST); 1371 1372 /* 1373 * Can't delete a head dataset if there are snapshots of it. 1374 * (Except if the only snapshots are from the branch we cloned 1375 * from.) 1376 */ 1377 if (ds->ds_prev != NULL && 1378 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1379 return (EINVAL); 1380 1381 /* 1382 * If we made changes this txg, traverse_dsl_dataset won't find 1383 * them. Try again. 1384 */ 1385 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1386 return (EAGAIN); 1387 1388 /* XXX we should do some i/o error checking... */ 1389 return (0); 1390 } 1391 1392 struct refsarg { 1393 kmutex_t lock; 1394 boolean_t gone; 1395 kcondvar_t cv; 1396 }; 1397 1398 /* ARGSUSED */ 1399 static void 1400 dsl_dataset_refs_gone(dmu_buf_t *db, void *argv) 1401 { 1402 struct refsarg *arg = argv; 1403 1404 mutex_enter(&arg->lock); 1405 arg->gone = TRUE; 1406 cv_signal(&arg->cv); 1407 mutex_exit(&arg->lock); 1408 } 1409 1410 static void 1411 dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag) 1412 { 1413 struct refsarg arg; 1414 1415 mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL); 1416 cv_init(&arg.cv, NULL, CV_DEFAULT, NULL); 1417 arg.gone = FALSE; 1418 (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys, 1419 dsl_dataset_refs_gone); 1420 dmu_buf_rele(ds->ds_dbuf, tag); 1421 mutex_enter(&arg.lock); 1422 while (!arg.gone) 1423 cv_wait(&arg.cv, &arg.lock); 1424 ASSERT(arg.gone); 1425 mutex_exit(&arg.lock); 1426 ds->ds_dbuf = NULL; 1427 ds->ds_phys = NULL; 1428 mutex_destroy(&arg.lock); 1429 cv_destroy(&arg.cv); 1430 } 1431 1432 void 1433 dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) 1434 { 1435 dsl_dataset_t *ds = arg1; 1436 zio_t *zio; 1437 int err; 1438 int after_branch_point = FALSE; 1439 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1440 objset_t *mos = dp->dp_meta_objset; 1441 dsl_dataset_t *ds_prev = NULL; 1442 uint64_t obj; 1443 1444 ASSERT(ds->ds_owner); 1445 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 1446 ASSERT(ds->ds_prev == NULL || 1447 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); 1448 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); 1449 1450 /* signal any waiters that this dataset is going away */ 1451 mutex_enter(&ds->ds_lock); 1452 ds->ds_owner = dsl_reaper; 1453 cv_broadcast(&ds->ds_exclusive_cv); 1454 mutex_exit(&ds->ds_lock); 1455 1456 /* Remove our reservation */ 1457 if (ds->ds_reserved != 0) { 1458 uint64_t val = 0; 1459 dsl_dataset_set_reservation_sync(ds, &val, cr, tx); 1460 ASSERT3U(ds->ds_reserved, ==, 0); 1461 } 1462 1463 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1464 1465 dsl_pool_ds_destroyed(ds, tx); 1466 1467 obj = ds->ds_object; 1468 1469 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1470 if (ds->ds_prev) { 1471 ds_prev = ds->ds_prev; 1472 } else { 1473 VERIFY(0 == dsl_dataset_hold_obj(dp, 1474 ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev)); 1475 } 1476 after_branch_point = 1477 (ds_prev->ds_phys->ds_next_snap_obj != obj); 1478 1479 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); 1480 if (after_branch_point && 1481 ds_prev->ds_phys->ds_next_clones_obj != 0) { 1482 VERIFY(0 == zap_remove_int(mos, 1483 ds_prev->ds_phys->ds_next_clones_obj, obj, tx)); 1484 if (ds->ds_phys->ds_next_snap_obj != 0) { 1485 VERIFY(0 == zap_add_int(mos, 1486 ds_prev->ds_phys->ds_next_clones_obj, 1487 ds->ds_phys->ds_next_snap_obj, tx)); 1488 } 1489 } 1490 if (after_branch_point && 1491 ds->ds_phys->ds_next_snap_obj == 0) { 1492 /* This clone is toast. */ 1493 ASSERT(ds_prev->ds_phys->ds_num_children > 1); 1494 ds_prev->ds_phys->ds_num_children--; 1495 } else if (!after_branch_point) { 1496 ds_prev->ds_phys->ds_next_snap_obj = 1497 ds->ds_phys->ds_next_snap_obj; 1498 } 1499 } 1500 1501 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1502 1503 if (ds->ds_phys->ds_next_snap_obj != 0) { 1504 blkptr_t bp; 1505 dsl_dataset_t *ds_next; 1506 uint64_t itor = 0; 1507 uint64_t old_unique; 1508 int64_t used = 0, compressed = 0, uncompressed = 0; 1509 1510 VERIFY(0 == dsl_dataset_hold_obj(dp, 1511 ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next)); 1512 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); 1513 1514 old_unique = dsl_dataset_unique(ds_next); 1515 1516 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); 1517 ds_next->ds_phys->ds_prev_snap_obj = 1518 ds->ds_phys->ds_prev_snap_obj; 1519 ds_next->ds_phys->ds_prev_snap_txg = 1520 ds->ds_phys->ds_prev_snap_txg; 1521 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1522 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); 1523 1524 /* 1525 * Transfer to our deadlist (which will become next's 1526 * new deadlist) any entries from next's current 1527 * deadlist which were born before prev, and free the 1528 * other entries. 1529 * 1530 * XXX we're doing this long task with the config lock held 1531 */ 1532 while (bplist_iterate(&ds_next->ds_deadlist, &itor, &bp) == 0) { 1533 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { 1534 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, 1535 &bp, tx)); 1536 if (ds_prev && !after_branch_point && 1537 bp.blk_birth > 1538 ds_prev->ds_phys->ds_prev_snap_txg) { 1539 ds_prev->ds_phys->ds_unique_bytes += 1540 bp_get_dasize(dp->dp_spa, &bp); 1541 } 1542 } else { 1543 used += bp_get_dasize(dp->dp_spa, &bp); 1544 compressed += BP_GET_PSIZE(&bp); 1545 uncompressed += BP_GET_UCSIZE(&bp); 1546 /* XXX check return value? */ 1547 (void) dsl_free(zio, dp, tx->tx_txg, 1548 &bp, NULL, NULL, ARC_NOWAIT); 1549 } 1550 } 1551 1552 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); 1553 1554 /* change snapused */ 1555 dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP, 1556 -used, -compressed, -uncompressed, tx); 1557 1558 /* free next's deadlist */ 1559 bplist_close(&ds_next->ds_deadlist); 1560 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); 1561 1562 /* set next's deadlist to our deadlist */ 1563 bplist_close(&ds->ds_deadlist); 1564 ds_next->ds_phys->ds_deadlist_obj = 1565 ds->ds_phys->ds_deadlist_obj; 1566 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, 1567 ds_next->ds_phys->ds_deadlist_obj)); 1568 ds->ds_phys->ds_deadlist_obj = 0; 1569 1570 if (ds_next->ds_phys->ds_next_snap_obj != 0) { 1571 /* 1572 * Update next's unique to include blocks which 1573 * were previously shared by only this snapshot 1574 * and it. Those blocks will be born after the 1575 * prev snap and before this snap, and will have 1576 * died after the next snap and before the one 1577 * after that (ie. be on the snap after next's 1578 * deadlist). 1579 * 1580 * XXX we're doing this long task with the 1581 * config lock held 1582 */ 1583 dsl_dataset_t *ds_after_next; 1584 uint64_t space; 1585 1586 VERIFY(0 == dsl_dataset_hold_obj(dp, 1587 ds_next->ds_phys->ds_next_snap_obj, 1588 FTAG, &ds_after_next)); 1589 1590 VERIFY(0 == 1591 bplist_space_birthrange(&ds_after_next->ds_deadlist, 1592 ds->ds_phys->ds_prev_snap_txg, 1593 ds->ds_phys->ds_creation_txg, &space)); 1594 ds_next->ds_phys->ds_unique_bytes += space; 1595 1596 dsl_dataset_rele(ds_after_next, FTAG); 1597 ASSERT3P(ds_next->ds_prev, ==, NULL); 1598 } else { 1599 ASSERT3P(ds_next->ds_prev, ==, ds); 1600 dsl_dataset_drop_ref(ds_next->ds_prev, ds_next); 1601 ds_next->ds_prev = NULL; 1602 if (ds_prev) { 1603 VERIFY(0 == dsl_dataset_get_ref(dp, 1604 ds->ds_phys->ds_prev_snap_obj, 1605 ds_next, &ds_next->ds_prev)); 1606 } 1607 1608 dsl_dataset_recalc_head_uniq(ds_next); 1609 1610 /* 1611 * Reduce the amount of our unconsmed refreservation 1612 * being charged to our parent by the amount of 1613 * new unique data we have gained. 1614 */ 1615 if (old_unique < ds_next->ds_reserved) { 1616 int64_t mrsdelta; 1617 uint64_t new_unique = 1618 ds_next->ds_phys->ds_unique_bytes; 1619 1620 ASSERT(old_unique <= new_unique); 1621 mrsdelta = MIN(new_unique - old_unique, 1622 ds_next->ds_reserved - old_unique); 1623 dsl_dir_diduse_space(ds->ds_dir, 1624 DD_USED_REFRSRV, -mrsdelta, 0, 0, tx); 1625 } 1626 } 1627 dsl_dataset_rele(ds_next, FTAG); 1628 } else { 1629 /* 1630 * There's no next snapshot, so this is a head dataset. 1631 * Destroy the deadlist. Unless it's a clone, the 1632 * deadlist should be empty. (If it's a clone, it's 1633 * safe to ignore the deadlist contents.) 1634 */ 1635 struct killarg ka; 1636 1637 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); 1638 bplist_close(&ds->ds_deadlist); 1639 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1640 ds->ds_phys->ds_deadlist_obj = 0; 1641 1642 /* 1643 * Free everything that we point to (that's born after 1644 * the previous snapshot, if we are a clone) 1645 * 1646 * NB: this should be very quick, because we already 1647 * freed all the objects in open context. 1648 */ 1649 ka.ds = ds; 1650 ka.zio = zio; 1651 ka.tx = tx; 1652 err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1653 ADVANCE_POST, kill_blkptr, &ka); 1654 ASSERT3U(err, ==, 0); 1655 ASSERT(spa_version(dp->dp_spa) < SPA_VERSION_UNIQUE_ACCURATE || 1656 ds->ds_phys->ds_unique_bytes == 0); 1657 } 1658 1659 err = zio_wait(zio); 1660 ASSERT3U(err, ==, 0); 1661 1662 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { 1663 /* Erase the link in the dir */ 1664 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 1665 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; 1666 ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0); 1667 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); 1668 ASSERT(err == 0); 1669 } else { 1670 /* remove from snapshot namespace */ 1671 dsl_dataset_t *ds_head; 1672 ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0); 1673 VERIFY(0 == dsl_dataset_hold_obj(dp, 1674 ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head)); 1675 VERIFY(0 == dsl_dataset_get_snapname(ds)); 1676 #ifdef ZFS_DEBUG 1677 { 1678 uint64_t val; 1679 1680 err = dsl_dataset_snap_lookup(ds_head, 1681 ds->ds_snapname, &val); 1682 ASSERT3U(err, ==, 0); 1683 ASSERT3U(val, ==, obj); 1684 } 1685 #endif 1686 err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx); 1687 ASSERT(err == 0); 1688 dsl_dataset_rele(ds_head, FTAG); 1689 } 1690 1691 if (ds_prev && ds->ds_prev != ds_prev) 1692 dsl_dataset_rele(ds_prev, FTAG); 1693 1694 spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); 1695 spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, 1696 cr, "dataset = %llu", ds->ds_object); 1697 1698 if (ds->ds_phys->ds_next_clones_obj != 0) { 1699 uint64_t count; 1700 ASSERT(0 == zap_count(mos, 1701 ds->ds_phys->ds_next_clones_obj, &count) && count == 0); 1702 VERIFY(0 == dmu_object_free(mos, 1703 ds->ds_phys->ds_next_clones_obj, tx)); 1704 } 1705 if (ds->ds_phys->ds_props_obj != 0) 1706 VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_props_obj, tx)); 1707 dsl_dir_close(ds->ds_dir, ds); 1708 ds->ds_dir = NULL; 1709 dsl_dataset_drain_refs(ds, tag); 1710 VERIFY(0 == dmu_object_free(mos, obj, tx)); 1711 } 1712 1713 static int 1714 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1715 { 1716 uint64_t asize; 1717 1718 if (!dmu_tx_is_syncing(tx)) 1719 return (0); 1720 1721 /* 1722 * If there's an fs-only reservation, any blocks that might become 1723 * owned by the snapshot dataset must be accommodated by space 1724 * outside of the reservation. 1725 */ 1726 asize = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1727 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, FALSE)) 1728 return (ENOSPC); 1729 1730 /* 1731 * Propogate any reserved space for this snapshot to other 1732 * snapshot checks in this sync group. 1733 */ 1734 if (asize > 0) 1735 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1736 1737 return (0); 1738 } 1739 1740 /* ARGSUSED */ 1741 int 1742 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 1743 { 1744 dsl_dataset_t *ds = arg1; 1745 const char *snapname = arg2; 1746 int err; 1747 uint64_t value; 1748 1749 /* 1750 * We don't allow multiple snapshots of the same txg. If there 1751 * is already one, try again. 1752 */ 1753 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 1754 return (EAGAIN); 1755 1756 /* 1757 * Check for conflicting name snapshot name. 1758 */ 1759 err = dsl_dataset_snap_lookup(ds, snapname, &value); 1760 if (err == 0) 1761 return (EEXIST); 1762 if (err != ENOENT) 1763 return (err); 1764 1765 /* 1766 * Check that the dataset's name is not too long. Name consists 1767 * of the dataset's length + 1 for the @-sign + snapshot name's length 1768 */ 1769 if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) 1770 return (ENAMETOOLONG); 1771 1772 err = dsl_dataset_snapshot_reserve_space(ds, tx); 1773 if (err) 1774 return (err); 1775 1776 ds->ds_trysnap_txg = tx->tx_txg; 1777 return (0); 1778 } 1779 1780 void 1781 dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1782 { 1783 dsl_dataset_t *ds = arg1; 1784 const char *snapname = arg2; 1785 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1786 dmu_buf_t *dbuf; 1787 dsl_dataset_phys_t *dsphys; 1788 uint64_t dsobj, crtxg; 1789 objset_t *mos = dp->dp_meta_objset; 1790 int err; 1791 1792 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1793 1794 /* 1795 * The origin's ds_creation_txg has to be < TXG_INITIAL 1796 */ 1797 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1798 crtxg = 1; 1799 else 1800 crtxg = tx->tx_txg; 1801 1802 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1803 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1804 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1805 dmu_buf_will_dirty(dbuf, tx); 1806 dsphys = dbuf->db_data; 1807 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1808 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1809 dsphys->ds_fsid_guid = unique_create(); 1810 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1811 sizeof (dsphys->ds_guid)); 1812 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1813 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1814 dsphys->ds_next_snap_obj = ds->ds_object; 1815 dsphys->ds_num_children = 1; 1816 dsphys->ds_creation_time = gethrestime_sec(); 1817 dsphys->ds_creation_txg = crtxg; 1818 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1819 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; 1820 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1821 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1822 dsphys->ds_flags = ds->ds_phys->ds_flags; 1823 dsphys->ds_bp = ds->ds_phys->ds_bp; 1824 dmu_buf_rele(dbuf, FTAG); 1825 1826 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1827 if (ds->ds_prev) { 1828 uint64_t next_clones_obj = 1829 ds->ds_prev->ds_phys->ds_next_clones_obj; 1830 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1831 ds->ds_object || 1832 ds->ds_prev->ds_phys->ds_num_children > 1); 1833 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1834 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1835 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1836 ds->ds_prev->ds_phys->ds_creation_txg); 1837 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1838 } else if (next_clones_obj != 0) { 1839 VERIFY3U(0, ==, zap_remove_int(mos, 1840 next_clones_obj, dsphys->ds_next_snap_obj, tx)); 1841 VERIFY3U(0, ==, zap_add_int(mos, 1842 next_clones_obj, dsobj, tx)); 1843 } 1844 } 1845 1846 /* 1847 * If we have a reference-reservation on this dataset, we will 1848 * need to increase the amount of refreservation being charged 1849 * since our unique space is going to zero. 1850 */ 1851 if (ds->ds_reserved) { 1852 int64_t add = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1853 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1854 add, 0, 0, tx); 1855 } 1856 1857 bplist_close(&ds->ds_deadlist); 1858 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1859 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1860 ds->ds_phys->ds_prev_snap_obj = dsobj; 1861 ds->ds_phys->ds_prev_snap_txg = crtxg; 1862 ds->ds_phys->ds_unique_bytes = 0; 1863 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1864 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1865 ds->ds_phys->ds_deadlist_obj = 1866 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1867 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1868 ds->ds_phys->ds_deadlist_obj)); 1869 1870 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); 1871 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1872 snapname, 8, 1, &dsobj, tx); 1873 ASSERT(err == 0); 1874 1875 if (ds->ds_prev) 1876 dsl_dataset_drop_ref(ds->ds_prev, ds); 1877 VERIFY(0 == dsl_dataset_get_ref(dp, 1878 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1879 1880 dsl_pool_ds_snapshotted(ds, tx); 1881 1882 spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, 1883 "dataset = %llu", dsobj); 1884 } 1885 1886 void 1887 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1888 { 1889 ASSERT(dmu_tx_is_syncing(tx)); 1890 ASSERT(ds->ds_user_ptr != NULL); 1891 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1892 1893 /* 1894 * in case we had to change ds_fsid_guid when we opened it, 1895 * sync it out now. 1896 */ 1897 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1898 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1899 1900 dsl_dir_dirty(ds->ds_dir, tx); 1901 dmu_objset_sync(ds->ds_user_ptr, zio, tx); 1902 } 1903 1904 void 1905 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1906 { 1907 uint64_t refd, avail, uobjs, aobjs; 1908 1909 dsl_dir_stats(ds->ds_dir, nv); 1910 1911 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1912 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1913 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1914 1915 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1916 ds->ds_phys->ds_creation_time); 1917 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1918 ds->ds_phys->ds_creation_txg); 1919 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1920 ds->ds_quota); 1921 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1922 ds->ds_reserved); 1923 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1924 ds->ds_phys->ds_guid); 1925 1926 if (ds->ds_phys->ds_next_snap_obj) { 1927 /* 1928 * This is a snapshot; override the dd's space used with 1929 * our unique space and compression ratio. 1930 */ 1931 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1932 ds->ds_phys->ds_unique_bytes); 1933 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 1934 ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1935 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1936 ds->ds_phys->ds_compressed_bytes)); 1937 } 1938 } 1939 1940 void 1941 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1942 { 1943 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1944 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1945 stat->dds_guid = ds->ds_phys->ds_guid; 1946 if (ds->ds_phys->ds_next_snap_obj) { 1947 stat->dds_is_snapshot = B_TRUE; 1948 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1949 } 1950 1951 /* clone origin is really a dsl_dir thing... */ 1952 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); 1953 if (dsl_dir_is_clone(ds->ds_dir)) { 1954 dsl_dataset_t *ods; 1955 1956 VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool, 1957 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1958 dsl_dataset_name(ods, stat->dds_origin); 1959 dsl_dataset_drop_ref(ods, FTAG); 1960 } 1961 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); 1962 } 1963 1964 uint64_t 1965 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1966 { 1967 return (ds->ds_fsid_guid); 1968 } 1969 1970 void 1971 dsl_dataset_space(dsl_dataset_t *ds, 1972 uint64_t *refdbytesp, uint64_t *availbytesp, 1973 uint64_t *usedobjsp, uint64_t *availobjsp) 1974 { 1975 *refdbytesp = ds->ds_phys->ds_used_bytes; 1976 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1977 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1978 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1979 if (ds->ds_quota != 0) { 1980 /* 1981 * Adjust available bytes according to refquota 1982 */ 1983 if (*refdbytesp < ds->ds_quota) 1984 *availbytesp = MIN(*availbytesp, 1985 ds->ds_quota - *refdbytesp); 1986 else 1987 *availbytesp = 0; 1988 } 1989 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 1990 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1991 } 1992 1993 boolean_t 1994 dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) 1995 { 1996 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1997 1998 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 1999 dsl_pool_sync_context(dp)); 2000 if (ds->ds_prev == NULL) 2001 return (B_FALSE); 2002 if (ds->ds_phys->ds_bp.blk_birth > 2003 ds->ds_prev->ds_phys->ds_creation_txg) 2004 return (B_TRUE); 2005 return (B_FALSE); 2006 } 2007 2008 /* ARGSUSED */ 2009 static int 2010 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) 2011 { 2012 dsl_dataset_t *ds = arg1; 2013 char *newsnapname = arg2; 2014 dsl_dir_t *dd = ds->ds_dir; 2015 dsl_dataset_t *hds; 2016 uint64_t val; 2017 int err; 2018 2019 err = dsl_dataset_hold_obj(dd->dd_pool, 2020 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds); 2021 if (err) 2022 return (err); 2023 2024 /* new name better not be in use */ 2025 err = dsl_dataset_snap_lookup(hds, newsnapname, &val); 2026 dsl_dataset_rele(hds, FTAG); 2027 2028 if (err == 0) 2029 err = EEXIST; 2030 else if (err == ENOENT) 2031 err = 0; 2032 2033 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2034 if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) 2035 err = ENAMETOOLONG; 2036 2037 return (err); 2038 } 2039 2040 static void 2041 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, 2042 cred_t *cr, dmu_tx_t *tx) 2043 { 2044 dsl_dataset_t *ds = arg1; 2045 const char *newsnapname = arg2; 2046 dsl_dir_t *dd = ds->ds_dir; 2047 objset_t *mos = dd->dd_pool->dp_meta_objset; 2048 dsl_dataset_t *hds; 2049 int err; 2050 2051 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); 2052 2053 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, 2054 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds)); 2055 2056 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2057 err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx); 2058 ASSERT3U(err, ==, 0); 2059 mutex_enter(&ds->ds_lock); 2060 (void) strcpy(ds->ds_snapname, newsnapname); 2061 mutex_exit(&ds->ds_lock); 2062 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, 2063 ds->ds_snapname, 8, 1, &ds->ds_object, tx); 2064 ASSERT3U(err, ==, 0); 2065 2066 spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, 2067 cr, "dataset = %llu", ds->ds_object); 2068 dsl_dataset_rele(hds, FTAG); 2069 } 2070 2071 struct renamesnaparg { 2072 dsl_sync_task_group_t *dstg; 2073 char failed[MAXPATHLEN]; 2074 char *oldsnap; 2075 char *newsnap; 2076 }; 2077 2078 static int 2079 dsl_snapshot_rename_one(char *name, void *arg) 2080 { 2081 struct renamesnaparg *ra = arg; 2082 dsl_dataset_t *ds = NULL; 2083 char *cp; 2084 int err; 2085 2086 cp = name + strlen(name); 2087 *cp = '@'; 2088 (void) strcpy(cp + 1, ra->oldsnap); 2089 2090 /* 2091 * For recursive snapshot renames the parent won't be changing 2092 * so we just pass name for both the to/from argument. 2093 */ 2094 err = zfs_secpolicy_rename_perms(name, name, CRED()); 2095 if (err == ENOENT) { 2096 return (0); 2097 } else if (err) { 2098 (void) strcpy(ra->failed, name); 2099 return (err); 2100 } 2101 2102 #ifdef _KERNEL 2103 /* 2104 * For all filesystems undergoing rename, we'll need to unmount it. 2105 */ 2106 (void) zfs_unmount_snap(name, NULL); 2107 #endif 2108 err = dsl_dataset_hold(name, ra->dstg, &ds); 2109 *cp = '\0'; 2110 if (err == ENOENT) { 2111 return (0); 2112 } else if (err) { 2113 (void) strcpy(ra->failed, name); 2114 return (err); 2115 } 2116 2117 dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, 2118 dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); 2119 2120 return (0); 2121 } 2122 2123 static int 2124 dsl_recursive_rename(char *oldname, const char *newname) 2125 { 2126 int err; 2127 struct renamesnaparg *ra; 2128 dsl_sync_task_t *dst; 2129 spa_t *spa; 2130 char *cp, *fsname = spa_strdup(oldname); 2131 int len = strlen(oldname); 2132 2133 /* truncate the snapshot name to get the fsname */ 2134 cp = strchr(fsname, '@'); 2135 *cp = '\0'; 2136 2137 err = spa_open(fsname, &spa, FTAG); 2138 if (err) { 2139 kmem_free(fsname, len + 1); 2140 return (err); 2141 } 2142 ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP); 2143 ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 2144 2145 ra->oldsnap = strchr(oldname, '@') + 1; 2146 ra->newsnap = strchr(newname, '@') + 1; 2147 *ra->failed = '\0'; 2148 2149 err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, 2150 DS_FIND_CHILDREN); 2151 kmem_free(fsname, len + 1); 2152 2153 if (err == 0) { 2154 err = dsl_sync_task_group_wait(ra->dstg); 2155 } 2156 2157 for (dst = list_head(&ra->dstg->dstg_tasks); dst; 2158 dst = list_next(&ra->dstg->dstg_tasks, dst)) { 2159 dsl_dataset_t *ds = dst->dst_arg1; 2160 if (dst->dst_err) { 2161 dsl_dir_name(ds->ds_dir, ra->failed); 2162 (void) strcat(ra->failed, "@"); 2163 (void) strcat(ra->failed, ra->newsnap); 2164 } 2165 dsl_dataset_rele(ds, ra->dstg); 2166 } 2167 2168 if (err) 2169 (void) strcpy(oldname, ra->failed); 2170 2171 dsl_sync_task_group_destroy(ra->dstg); 2172 kmem_free(ra, sizeof (struct renamesnaparg)); 2173 spa_close(spa, FTAG); 2174 return (err); 2175 } 2176 2177 static int 2178 dsl_valid_rename(char *oldname, void *arg) 2179 { 2180 int delta = *(int *)arg; 2181 2182 if (strlen(oldname) + delta >= MAXNAMELEN) 2183 return (ENAMETOOLONG); 2184 2185 return (0); 2186 } 2187 2188 #pragma weak dmu_objset_rename = dsl_dataset_rename 2189 int 2190 dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive) 2191 { 2192 dsl_dir_t *dd; 2193 dsl_dataset_t *ds; 2194 const char *tail; 2195 int err; 2196 2197 err = dsl_dir_open(oldname, FTAG, &dd, &tail); 2198 if (err) 2199 return (err); 2200 if (tail == NULL) { 2201 int delta = strlen(newname) - strlen(oldname); 2202 2203 /* if we're growing, validate child name lengths */ 2204 if (delta > 0) 2205 err = dmu_objset_find(oldname, dsl_valid_rename, 2206 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); 2207 2208 if (!err) 2209 err = dsl_dir_rename(dd, newname); 2210 dsl_dir_close(dd, FTAG); 2211 return (err); 2212 } 2213 if (tail[0] != '@') { 2214 /* the name ended in a nonexistant component */ 2215 dsl_dir_close(dd, FTAG); 2216 return (ENOENT); 2217 } 2218 2219 dsl_dir_close(dd, FTAG); 2220 2221 /* new name must be snapshot in same filesystem */ 2222 tail = strchr(newname, '@'); 2223 if (tail == NULL) 2224 return (EINVAL); 2225 tail++; 2226 if (strncmp(oldname, newname, tail - newname) != 0) 2227 return (EXDEV); 2228 2229 if (recursive) { 2230 err = dsl_recursive_rename(oldname, newname); 2231 } else { 2232 err = dsl_dataset_hold(oldname, FTAG, &ds); 2233 if (err) 2234 return (err); 2235 2236 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2237 dsl_dataset_snapshot_rename_check, 2238 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); 2239 2240 dsl_dataset_rele(ds, FTAG); 2241 } 2242 2243 return (err); 2244 } 2245 2246 struct promotenode { 2247 list_node_t link; 2248 dsl_dataset_t *ds; 2249 }; 2250 2251 struct promotearg { 2252 list_t shared_snaps, origin_snaps, clone_snaps; 2253 dsl_dataset_t *origin_origin, *origin_head; 2254 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2255 }; 2256 2257 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2258 2259 /* ARGSUSED */ 2260 static int 2261 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) 2262 { 2263 dsl_dataset_t *hds = arg1; 2264 struct promotearg *pa = arg2; 2265 struct promotenode *snap = list_head(&pa->shared_snaps); 2266 dsl_dataset_t *origin_ds = snap->ds; 2267 int err; 2268 2269 /* Check that it is a real clone */ 2270 if (!dsl_dir_is_clone(hds->ds_dir)) 2271 return (EINVAL); 2272 2273 /* Since this is so expensive, don't do the preliminary check */ 2274 if (!dmu_tx_is_syncing(tx)) 2275 return (0); 2276 2277 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) 2278 return (EXDEV); 2279 2280 /* compute origin's new unique space */ 2281 snap = list_tail(&pa->clone_snaps); 2282 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2283 err = bplist_space_birthrange(&snap->ds->ds_deadlist, 2284 origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, &pa->unique); 2285 if (err) 2286 return (err); 2287 2288 /* 2289 * Walk the snapshots that we are moving 2290 * 2291 * Compute space to transfer. Consider the incremental changes 2292 * to used for each snapshot: 2293 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2294 * So each snapshot gave birth to: 2295 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2296 * So a sequence would look like: 2297 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2298 * Which simplifies to: 2299 * uN + kN + kN-1 + ... + k1 + k0 2300 * Note however, if we stop before we reach the ORIGIN we get: 2301 * uN + kN + kN-1 + ... + kM - uM-1 2302 */ 2303 pa->used = origin_ds->ds_phys->ds_used_bytes; 2304 pa->comp = origin_ds->ds_phys->ds_compressed_bytes; 2305 pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 2306 for (snap = list_head(&pa->shared_snaps); snap; 2307 snap = list_next(&pa->shared_snaps, snap)) { 2308 uint64_t val, dlused, dlcomp, dluncomp; 2309 dsl_dataset_t *ds = snap->ds; 2310 2311 /* Check that the snapshot name does not conflict */ 2312 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2313 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2314 if (err == 0) 2315 return (EEXIST); 2316 if (err != ENOENT) 2317 return (err); 2318 2319 /* The very first snapshot does not have a deadlist */ 2320 if (ds->ds_phys->ds_prev_snap_obj == 0) 2321 continue; 2322 2323 if (err = bplist_space(&ds->ds_deadlist, 2324 &dlused, &dlcomp, &dluncomp)) 2325 return (err); 2326 pa->used += dlused; 2327 pa->comp += dlcomp; 2328 pa->uncomp += dluncomp; 2329 } 2330 2331 /* 2332 * If we are a clone of a clone then we never reached ORIGIN, 2333 * so we need to subtract out the clone origin's used space. 2334 */ 2335 if (pa->origin_origin) { 2336 pa->used -= pa->origin_origin->ds_phys->ds_used_bytes; 2337 pa->comp -= pa->origin_origin->ds_phys->ds_compressed_bytes; 2338 pa->uncomp -= pa->origin_origin->ds_phys->ds_uncompressed_bytes; 2339 } 2340 2341 /* Check that there is enough space here */ 2342 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2343 pa->used); 2344 if (err) 2345 return (err); 2346 2347 /* 2348 * Compute the amounts of space that will be used by snapshots 2349 * after the promotion (for both origin and clone). For each, 2350 * it is the amount of space that will be on all of their 2351 * deadlists (that was not born before their new origin). 2352 */ 2353 if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2354 uint64_t space; 2355 2356 /* 2357 * Note, typically this will not be a clone of a clone, 2358 * so snap->ds->ds_origin_txg will be < TXG_INITIAL, so 2359 * these snaplist_space() -> bplist_space_birthrange() 2360 * calls will be fast because they do not have to 2361 * iterate over all bps. 2362 */ 2363 snap = list_head(&pa->origin_snaps); 2364 err = snaplist_space(&pa->shared_snaps, 2365 snap->ds->ds_origin_txg, &pa->cloneusedsnap); 2366 if (err) 2367 return (err); 2368 2369 err = snaplist_space(&pa->clone_snaps, 2370 snap->ds->ds_origin_txg, &space); 2371 if (err) 2372 return (err); 2373 pa->cloneusedsnap += space; 2374 } 2375 if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2376 err = snaplist_space(&pa->origin_snaps, 2377 origin_ds->ds_phys->ds_creation_txg, &pa->originusedsnap); 2378 if (err) 2379 return (err); 2380 } 2381 2382 return (0); 2383 } 2384 2385 static void 2386 dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2387 { 2388 dsl_dataset_t *hds = arg1; 2389 struct promotearg *pa = arg2; 2390 struct promotenode *snap = list_head(&pa->shared_snaps); 2391 dsl_dataset_t *origin_ds = snap->ds; 2392 dsl_dataset_t *origin_head; 2393 dsl_dir_t *dd = hds->ds_dir; 2394 dsl_pool_t *dp = hds->ds_dir->dd_pool; 2395 dsl_dir_t *odd = NULL; 2396 uint64_t oldnext_obj; 2397 int64_t delta; 2398 2399 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); 2400 2401 snap = list_head(&pa->origin_snaps); 2402 origin_head = snap->ds; 2403 2404 /* 2405 * We need to explicitly open odd, since origin_ds's dd will be 2406 * changing. 2407 */ 2408 VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object, 2409 NULL, FTAG, &odd)); 2410 2411 /* change origin's next snap */ 2412 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2413 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; 2414 snap = list_tail(&pa->clone_snaps); 2415 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2416 origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; 2417 2418 /* change the origin's next clone */ 2419 if (origin_ds->ds_phys->ds_next_clones_obj) { 2420 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 2421 origin_ds->ds_phys->ds_next_clones_obj, 2422 origin_ds->ds_phys->ds_next_snap_obj, tx)); 2423 VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset, 2424 origin_ds->ds_phys->ds_next_clones_obj, 2425 oldnext_obj, tx)); 2426 } 2427 2428 /* change origin */ 2429 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2430 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 2431 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 2432 hds->ds_origin_txg = origin_head->ds_origin_txg; 2433 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2434 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 2435 origin_head->ds_origin_txg = origin_ds->ds_phys->ds_creation_txg; 2436 2437 /* move snapshots to this dir */ 2438 for (snap = list_head(&pa->shared_snaps); snap; 2439 snap = list_next(&pa->shared_snaps, snap)) { 2440 dsl_dataset_t *ds = snap->ds; 2441 2442 /* unregister props as dsl_dir is changing */ 2443 if (ds->ds_user_ptr) { 2444 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 2445 ds->ds_user_ptr = NULL; 2446 } 2447 /* move snap name entry */ 2448 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2449 VERIFY(0 == dsl_dataset_snap_remove(origin_head, 2450 ds->ds_snapname, tx)); 2451 VERIFY(0 == zap_add(dp->dp_meta_objset, 2452 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2453 8, 1, &ds->ds_object, tx)); 2454 /* change containing dsl_dir */ 2455 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2456 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2457 ds->ds_phys->ds_dir_obj = dd->dd_object; 2458 ASSERT3P(ds->ds_dir, ==, odd); 2459 dsl_dir_close(ds->ds_dir, ds); 2460 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, 2461 NULL, ds, &ds->ds_dir)); 2462 2463 ASSERT3U(dsl_prop_numcb(ds), ==, 0); 2464 } 2465 2466 /* 2467 * Change space accounting. 2468 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2469 * both be valid, or both be 0 (resulting in delta == 0). This 2470 * is true for each of {clone,origin} independently. 2471 */ 2472 2473 delta = pa->cloneusedsnap - 2474 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2475 ASSERT3S(delta, >=, 0); 2476 ASSERT3U(pa->used, >=, delta); 2477 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2478 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2479 pa->used - delta, pa->comp, pa->uncomp, tx); 2480 2481 delta = pa->originusedsnap - 2482 odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2483 ASSERT3S(delta, <=, 0); 2484 ASSERT3U(pa->used, >=, -delta); 2485 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2486 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2487 -pa->used - delta, -pa->comp, -pa->uncomp, tx); 2488 2489 origin_ds->ds_phys->ds_unique_bytes = pa->unique; 2490 2491 /* log history record */ 2492 spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, 2493 cr, "dataset = %llu", hds->ds_object); 2494 2495 dsl_dir_close(odd, FTAG); 2496 } 2497 2498 static char *snaplist_tag = "snaplist"; 2499 /* 2500 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2501 * (exclusive) and last_obj (inclusive). The list will be in reverse 2502 * order (last_obj will be the list_head()). If first_obj == 0, do all 2503 * snapshots back to this dataset's origin. 2504 */ 2505 static int 2506 snaplist_make(dsl_pool_t *dp, boolean_t own, 2507 uint64_t first_obj, uint64_t last_obj, list_t *l) 2508 { 2509 uint64_t obj = last_obj; 2510 2511 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock)); 2512 2513 list_create(l, sizeof (struct promotenode), 2514 offsetof(struct promotenode, link)); 2515 2516 while (obj != first_obj) { 2517 dsl_dataset_t *ds; 2518 struct promotenode *snap; 2519 int err; 2520 2521 if (own) { 2522 err = dsl_dataset_own_obj(dp, obj, 2523 0, snaplist_tag, &ds); 2524 if (err == 0) 2525 dsl_dataset_make_exclusive(ds, snaplist_tag); 2526 } else { 2527 err = dsl_dataset_hold_obj(dp, obj, snaplist_tag, &ds); 2528 } 2529 if (err == ENOENT) { 2530 /* lost race with snapshot destroy */ 2531 struct promotenode *last = list_tail(l); 2532 ASSERT(obj != last->ds->ds_phys->ds_prev_snap_obj); 2533 obj = last->ds->ds_phys->ds_prev_snap_obj; 2534 continue; 2535 } else if (err) { 2536 return (err); 2537 } 2538 2539 if (first_obj == 0) 2540 first_obj = ds->ds_dir->dd_phys->dd_origin_obj; 2541 2542 snap = kmem_alloc(sizeof (struct promotenode), KM_SLEEP); 2543 snap->ds = ds; 2544 list_insert_tail(l, snap); 2545 obj = ds->ds_phys->ds_prev_snap_obj; 2546 } 2547 2548 return (0); 2549 } 2550 2551 static int 2552 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2553 { 2554 struct promotenode *snap; 2555 2556 *spacep = 0; 2557 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2558 uint64_t used; 2559 int err = bplist_space_birthrange(&snap->ds->ds_deadlist, 2560 mintxg, UINT64_MAX, &used); 2561 if (err) 2562 return (err); 2563 *spacep += used; 2564 } 2565 return (0); 2566 } 2567 2568 static void 2569 snaplist_destroy(list_t *l, boolean_t own) 2570 { 2571 struct promotenode *snap; 2572 2573 if (!list_link_active(&l->list_head)) 2574 return; 2575 2576 while ((snap = list_tail(l)) != NULL) { 2577 list_remove(l, snap); 2578 if (own) 2579 dsl_dataset_disown(snap->ds, snaplist_tag); 2580 else 2581 dsl_dataset_rele(snap->ds, snaplist_tag); 2582 kmem_free(snap, sizeof (struct promotenode)); 2583 } 2584 list_destroy(l); 2585 } 2586 2587 /* 2588 * Promote a clone. Nomenclature note: 2589 * "clone" or "cds": the original clone which is being promoted 2590 * "origin" or "ods": the snapshot which is originally clone's origin 2591 * "origin head" or "ohds": the dataset which is the head 2592 * (filesystem/volume) for the origin 2593 * "origin origin": the origin of the origin's filesystem (typically 2594 * NULL, indicating that the clone is not a clone of a clone). 2595 */ 2596 int 2597 dsl_dataset_promote(const char *name) 2598 { 2599 dsl_dataset_t *ds; 2600 dsl_dir_t *dd; 2601 dsl_pool_t *dp; 2602 dmu_object_info_t doi; 2603 struct promotearg pa = { 0 }; 2604 struct promotenode *snap; 2605 int err; 2606 2607 err = dsl_dataset_hold(name, FTAG, &ds); 2608 if (err) 2609 return (err); 2610 dd = ds->ds_dir; 2611 dp = dd->dd_pool; 2612 2613 err = dmu_object_info(dp->dp_meta_objset, 2614 ds->ds_phys->ds_snapnames_zapobj, &doi); 2615 if (err) { 2616 dsl_dataset_rele(ds, FTAG); 2617 return (err); 2618 } 2619 2620 if (dsl_dataset_is_snapshot(ds) || dd->dd_phys->dd_origin_obj == 0) { 2621 dsl_dataset_rele(ds, FTAG); 2622 return (EINVAL); 2623 } 2624 2625 /* 2626 * We are going to inherit all the snapshots taken before our 2627 * origin (i.e., our new origin will be our parent's origin). 2628 * Take ownership of them so that we can rename them into our 2629 * namespace. 2630 */ 2631 rw_enter(&dp->dp_config_rwlock, RW_READER); 2632 2633 err = snaplist_make(dp, B_TRUE, 0, dd->dd_phys->dd_origin_obj, 2634 &pa.shared_snaps); 2635 if (err != 0) 2636 goto out; 2637 2638 err = snaplist_make(dp, B_FALSE, 0, ds->ds_object, &pa.clone_snaps); 2639 if (err != 0) 2640 goto out; 2641 2642 snap = list_head(&pa.shared_snaps); 2643 ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); 2644 err = snaplist_make(dp, B_FALSE, dd->dd_phys->dd_origin_obj, 2645 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, &pa.origin_snaps); 2646 if (err != 0) 2647 goto out; 2648 2649 if (dsl_dir_is_clone(snap->ds->ds_dir)) { 2650 err = dsl_dataset_own_obj(dp, 2651 snap->ds->ds_dir->dd_phys->dd_origin_obj, 2652 0, FTAG, &pa.origin_origin); 2653 if (err != 0) 2654 goto out; 2655 } 2656 2657 out: 2658 rw_exit(&dp->dp_config_rwlock); 2659 2660 /* 2661 * Add in 128x the snapnames zapobj size, since we will be moving 2662 * a bunch of snapnames to the promoted ds, and dirtying their 2663 * bonus buffers. 2664 */ 2665 if (err == 0) { 2666 err = dsl_sync_task_do(dp, dsl_dataset_promote_check, 2667 dsl_dataset_promote_sync, ds, &pa, 2668 2 + 2 * doi.doi_physical_blks); 2669 } 2670 2671 snaplist_destroy(&pa.shared_snaps, B_TRUE); 2672 snaplist_destroy(&pa.clone_snaps, B_FALSE); 2673 snaplist_destroy(&pa.origin_snaps, B_FALSE); 2674 if (pa.origin_origin) 2675 dsl_dataset_disown(pa.origin_origin, FTAG); 2676 dsl_dataset_rele(ds, FTAG); 2677 return (err); 2678 } 2679 2680 struct cloneswaparg { 2681 dsl_dataset_t *cds; /* clone dataset */ 2682 dsl_dataset_t *ohds; /* origin's head dataset */ 2683 boolean_t force; 2684 int64_t unused_refres_delta; /* change in unconsumed refreservation */ 2685 }; 2686 2687 /* ARGSUSED */ 2688 static int 2689 dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx) 2690 { 2691 struct cloneswaparg *csa = arg1; 2692 2693 /* they should both be heads */ 2694 if (dsl_dataset_is_snapshot(csa->cds) || 2695 dsl_dataset_is_snapshot(csa->ohds)) 2696 return (EINVAL); 2697 2698 /* the branch point should be just before them */ 2699 if (csa->cds->ds_prev != csa->ohds->ds_prev) 2700 return (EINVAL); 2701 2702 /* cds should be the clone */ 2703 if (csa->cds->ds_prev->ds_phys->ds_next_snap_obj != 2704 csa->ohds->ds_object) 2705 return (EINVAL); 2706 2707 /* the clone should be a child of the origin */ 2708 if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir) 2709 return (EINVAL); 2710 2711 /* ohds shouldn't be modified unless 'force' */ 2712 if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds)) 2713 return (ETXTBSY); 2714 2715 /* adjust amount of any unconsumed refreservation */ 2716 csa->unused_refres_delta = 2717 (int64_t)MIN(csa->ohds->ds_reserved, 2718 csa->ohds->ds_phys->ds_unique_bytes) - 2719 (int64_t)MIN(csa->ohds->ds_reserved, 2720 csa->cds->ds_phys->ds_unique_bytes); 2721 2722 if (csa->unused_refres_delta > 0 && 2723 csa->unused_refres_delta > 2724 dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE)) 2725 return (ENOSPC); 2726 2727 return (0); 2728 } 2729 2730 /* ARGSUSED */ 2731 static void 2732 dsl_dataset_clone_swap_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2733 { 2734 struct cloneswaparg *csa = arg1; 2735 dsl_pool_t *dp = csa->cds->ds_dir->dd_pool; 2736 2737 ASSERT(csa->cds->ds_reserved == 0); 2738 ASSERT(csa->cds->ds_quota == csa->ohds->ds_quota); 2739 2740 dmu_buf_will_dirty(csa->cds->ds_dbuf, tx); 2741 dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx); 2742 dmu_buf_will_dirty(csa->cds->ds_prev->ds_dbuf, tx); 2743 2744 if (csa->cds->ds_user_ptr != NULL) { 2745 csa->cds->ds_user_evict_func(csa->cds, csa->cds->ds_user_ptr); 2746 csa->cds->ds_user_ptr = NULL; 2747 } 2748 2749 if (csa->ohds->ds_user_ptr != NULL) { 2750 csa->ohds->ds_user_evict_func(csa->ohds, 2751 csa->ohds->ds_user_ptr); 2752 csa->ohds->ds_user_ptr = NULL; 2753 } 2754 2755 /* reset origin's unique bytes */ 2756 VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, 2757 csa->cds->ds_prev->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2758 &csa->cds->ds_prev->ds_phys->ds_unique_bytes)); 2759 2760 /* swap blkptrs */ 2761 { 2762 blkptr_t tmp; 2763 tmp = csa->ohds->ds_phys->ds_bp; 2764 csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp; 2765 csa->cds->ds_phys->ds_bp = tmp; 2766 } 2767 2768 /* set dd_*_bytes */ 2769 { 2770 int64_t dused, dcomp, duncomp; 2771 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2772 uint64_t odl_used, odl_comp, odl_uncomp; 2773 2774 ASSERT3U(csa->cds->ds_dir->dd_phys-> 2775 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2776 2777 VERIFY(0 == bplist_space(&csa->cds->ds_deadlist, &cdl_used, 2778 &cdl_comp, &cdl_uncomp)); 2779 VERIFY(0 == bplist_space(&csa->ohds->ds_deadlist, &odl_used, 2780 &odl_comp, &odl_uncomp)); 2781 2782 dused = csa->cds->ds_phys->ds_used_bytes + cdl_used - 2783 (csa->ohds->ds_phys->ds_used_bytes + odl_used); 2784 dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp - 2785 (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp); 2786 duncomp = csa->cds->ds_phys->ds_uncompressed_bytes + 2787 cdl_uncomp - 2788 (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2789 2790 dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_HEAD, 2791 dused, dcomp, duncomp, tx); 2792 dsl_dir_diduse_space(csa->cds->ds_dir, DD_USED_HEAD, 2793 -dused, -dcomp, -duncomp, tx); 2794 2795 /* 2796 * The difference in the space used by snapshots is the 2797 * difference in snapshot space due to the head's 2798 * deadlist (since that's the only thing that's 2799 * changing that affects the snapused). 2800 */ 2801 VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, 2802 csa->ohds->ds_origin_txg, UINT64_MAX, &cdl_used)); 2803 VERIFY(0 == bplist_space_birthrange(&csa->ohds->ds_deadlist, 2804 csa->ohds->ds_origin_txg, UINT64_MAX, &odl_used)); 2805 dsl_dir_transfer_space(csa->ohds->ds_dir, cdl_used - odl_used, 2806 DD_USED_HEAD, DD_USED_SNAP, tx); 2807 } 2808 2809 #define SWITCH64(x, y) \ 2810 { \ 2811 uint64_t __tmp = (x); \ 2812 (x) = (y); \ 2813 (y) = __tmp; \ 2814 } 2815 2816 /* swap ds_*_bytes */ 2817 SWITCH64(csa->ohds->ds_phys->ds_used_bytes, 2818 csa->cds->ds_phys->ds_used_bytes); 2819 SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes, 2820 csa->cds->ds_phys->ds_compressed_bytes); 2821 SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes, 2822 csa->cds->ds_phys->ds_uncompressed_bytes); 2823 SWITCH64(csa->ohds->ds_phys->ds_unique_bytes, 2824 csa->cds->ds_phys->ds_unique_bytes); 2825 2826 /* apply any parent delta for change in unconsumed refreservation */ 2827 dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_REFRSRV, 2828 csa->unused_refres_delta, 0, 0, tx); 2829 2830 /* swap deadlists */ 2831 bplist_close(&csa->cds->ds_deadlist); 2832 bplist_close(&csa->ohds->ds_deadlist); 2833 SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj, 2834 csa->cds->ds_phys->ds_deadlist_obj); 2835 VERIFY(0 == bplist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset, 2836 csa->cds->ds_phys->ds_deadlist_obj)); 2837 VERIFY(0 == bplist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset, 2838 csa->ohds->ds_phys->ds_deadlist_obj)); 2839 } 2840 2841 /* 2842 * Swap 'clone' with its origin head file system. Used at the end 2843 * of "online recv" to swizzle the file system to the new version. 2844 */ 2845 int 2846 dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, 2847 boolean_t force) 2848 { 2849 struct cloneswaparg csa; 2850 int error; 2851 2852 ASSERT(clone->ds_owner); 2853 ASSERT(origin_head->ds_owner); 2854 retry: 2855 /* Need exclusive access for the swap */ 2856 rw_enter(&clone->ds_rwlock, RW_WRITER); 2857 if (!rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) { 2858 rw_exit(&clone->ds_rwlock); 2859 rw_enter(&origin_head->ds_rwlock, RW_WRITER); 2860 if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) { 2861 rw_exit(&origin_head->ds_rwlock); 2862 goto retry; 2863 } 2864 } 2865 csa.cds = clone; 2866 csa.ohds = origin_head; 2867 csa.force = force; 2868 error = dsl_sync_task_do(clone->ds_dir->dd_pool, 2869 dsl_dataset_clone_swap_check, 2870 dsl_dataset_clone_swap_sync, &csa, NULL, 9); 2871 return (error); 2872 } 2873 2874 /* 2875 * Given a pool name and a dataset object number in that pool, 2876 * return the name of that dataset. 2877 */ 2878 int 2879 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2880 { 2881 spa_t *spa; 2882 dsl_pool_t *dp; 2883 dsl_dataset_t *ds; 2884 int error; 2885 2886 if ((error = spa_open(pname, &spa, FTAG)) != 0) 2887 return (error); 2888 dp = spa_get_dsl(spa); 2889 rw_enter(&dp->dp_config_rwlock, RW_READER); 2890 if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) { 2891 dsl_dataset_name(ds, buf); 2892 dsl_dataset_rele(ds, FTAG); 2893 } 2894 rw_exit(&dp->dp_config_rwlock); 2895 spa_close(spa, FTAG); 2896 2897 return (error); 2898 } 2899 2900 int 2901 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2902 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2903 { 2904 int error = 0; 2905 2906 ASSERT3S(asize, >, 0); 2907 2908 /* 2909 * *ref_rsrv is the portion of asize that will come from any 2910 * unconsumed refreservation space. 2911 */ 2912 *ref_rsrv = 0; 2913 2914 mutex_enter(&ds->ds_lock); 2915 /* 2916 * Make a space adjustment for reserved bytes. 2917 */ 2918 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2919 ASSERT3U(*used, >=, 2920 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2921 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2922 *ref_rsrv = 2923 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2924 } 2925 2926 if (!check_quota || ds->ds_quota == 0) { 2927 mutex_exit(&ds->ds_lock); 2928 return (0); 2929 } 2930 /* 2931 * If they are requesting more space, and our current estimate 2932 * is over quota, they get to try again unless the actual 2933 * on-disk is over quota and there are no pending changes (which 2934 * may free up space for us). 2935 */ 2936 if (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) { 2937 if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota) 2938 error = ERESTART; 2939 else 2940 error = EDQUOT; 2941 } 2942 mutex_exit(&ds->ds_lock); 2943 2944 return (error); 2945 } 2946 2947 /* ARGSUSED */ 2948 static int 2949 dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) 2950 { 2951 dsl_dataset_t *ds = arg1; 2952 uint64_t *quotap = arg2; 2953 uint64_t new_quota = *quotap; 2954 2955 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA) 2956 return (ENOTSUP); 2957 2958 if (new_quota == 0) 2959 return (0); 2960 2961 if (new_quota < ds->ds_phys->ds_used_bytes || 2962 new_quota < ds->ds_reserved) 2963 return (ENOSPC); 2964 2965 return (0); 2966 } 2967 2968 /* ARGSUSED */ 2969 void 2970 dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2971 { 2972 dsl_dataset_t *ds = arg1; 2973 uint64_t *quotap = arg2; 2974 uint64_t new_quota = *quotap; 2975 2976 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2977 2978 ds->ds_quota = new_quota; 2979 2980 dsl_prop_set_uint64_sync(ds->ds_dir, "refquota", new_quota, cr, tx); 2981 2982 spa_history_internal_log(LOG_DS_REFQUOTA, ds->ds_dir->dd_pool->dp_spa, 2983 tx, cr, "%lld dataset = %llu ", 2984 (longlong_t)new_quota, ds->ds_object); 2985 } 2986 2987 int 2988 dsl_dataset_set_quota(const char *dsname, uint64_t quota) 2989 { 2990 dsl_dataset_t *ds; 2991 int err; 2992 2993 err = dsl_dataset_hold(dsname, FTAG, &ds); 2994 if (err) 2995 return (err); 2996 2997 if (quota != ds->ds_quota) { 2998 /* 2999 * If someone removes a file, then tries to set the quota, we 3000 * want to make sure the file freeing takes effect. 3001 */ 3002 txg_wait_open(ds->ds_dir->dd_pool, 0); 3003 3004 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 3005 dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync, 3006 ds, "a, 0); 3007 } 3008 dsl_dataset_rele(ds, FTAG); 3009 return (err); 3010 } 3011 3012 static int 3013 dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) 3014 { 3015 dsl_dataset_t *ds = arg1; 3016 uint64_t *reservationp = arg2; 3017 uint64_t new_reservation = *reservationp; 3018 int64_t delta; 3019 uint64_t unique; 3020 3021 if (new_reservation > INT64_MAX) 3022 return (EOVERFLOW); 3023 3024 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < 3025 SPA_VERSION_REFRESERVATION) 3026 return (ENOTSUP); 3027 3028 if (dsl_dataset_is_snapshot(ds)) 3029 return (EINVAL); 3030 3031 /* 3032 * If we are doing the preliminary check in open context, the 3033 * space estimates may be inaccurate. 3034 */ 3035 if (!dmu_tx_is_syncing(tx)) 3036 return (0); 3037 3038 mutex_enter(&ds->ds_lock); 3039 unique = dsl_dataset_unique(ds); 3040 delta = MAX(unique, new_reservation) - MAX(unique, ds->ds_reserved); 3041 mutex_exit(&ds->ds_lock); 3042 3043 if (delta > 0 && 3044 delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 3045 return (ENOSPC); 3046 if (delta > 0 && ds->ds_quota > 0 && 3047 new_reservation > ds->ds_quota) 3048 return (ENOSPC); 3049 3050 return (0); 3051 } 3052 3053 /* ARGSUSED */ 3054 static void 3055 dsl_dataset_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, 3056 dmu_tx_t *tx) 3057 { 3058 dsl_dataset_t *ds = arg1; 3059 uint64_t *reservationp = arg2; 3060 uint64_t new_reservation = *reservationp; 3061 uint64_t unique; 3062 int64_t delta; 3063 3064 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3065 3066 mutex_enter(&ds->ds_dir->dd_lock); 3067 mutex_enter(&ds->ds_lock); 3068 unique = dsl_dataset_unique(ds); 3069 delta = MAX(0, (int64_t)(new_reservation - unique)) - 3070 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3071 ds->ds_reserved = new_reservation; 3072 mutex_exit(&ds->ds_lock); 3073 3074 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3075 mutex_exit(&ds->ds_dir->dd_lock); 3076 dsl_prop_set_uint64_sync(ds->ds_dir, "refreservation", 3077 new_reservation, cr, tx); 3078 3079 spa_history_internal_log(LOG_DS_REFRESERV, 3080 ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu", 3081 (longlong_t)new_reservation, ds->ds_object); 3082 } 3083 3084 int 3085 dsl_dataset_set_reservation(const char *dsname, uint64_t reservation) 3086 { 3087 dsl_dataset_t *ds; 3088 int err; 3089 3090 err = dsl_dataset_hold(dsname, FTAG, &ds); 3091 if (err) 3092 return (err); 3093 3094 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 3095 dsl_dataset_set_reservation_check, 3096 dsl_dataset_set_reservation_sync, ds, &reservation, 0); 3097 dsl_dataset_rele(ds, FTAG); 3098 return (err); 3099 } 3100