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 2009 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(pio != NULL); 130 ASSERT(dmu_tx_is_syncing(tx)); 131 /* No block pointer => nothing to free */ 132 if (BP_IS_HOLE(bp)) 133 return (0); 134 135 ASSERT(used > 0); 136 if (ds == NULL) { 137 int err; 138 /* 139 * Account for the meta-objset space in its placeholder 140 * dataset. 141 */ 142 err = dsl_free(pio, tx->tx_pool, 143 tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT); 144 ASSERT(err == 0); 145 146 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, DD_USED_HEAD, 147 -used, -compressed, -uncompressed, tx); 148 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 149 return (used); 150 } 151 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 152 153 ASSERT(!dsl_dataset_is_snapshot(ds)); 154 dmu_buf_will_dirty(ds->ds_dbuf, tx); 155 156 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 157 int err; 158 int64_t delta; 159 160 dprintf_bp(bp, "freeing: %s", ""); 161 err = dsl_free(pio, tx->tx_pool, 162 tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT); 163 ASSERT(err == 0); 164 165 mutex_enter(&ds->ds_dir->dd_lock); 166 mutex_enter(&ds->ds_lock); 167 ASSERT(ds->ds_phys->ds_unique_bytes >= used || 168 !DS_UNIQUE_IS_ACCURATE(ds)); 169 delta = parent_delta(ds, -used); 170 ds->ds_phys->ds_unique_bytes -= used; 171 mutex_exit(&ds->ds_lock); 172 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 173 delta, -compressed, -uncompressed, tx); 174 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 175 DD_USED_REFRSRV, DD_USED_HEAD, tx); 176 mutex_exit(&ds->ds_dir->dd_lock); 177 } else { 178 dprintf_bp(bp, "putting on dead list: %s", ""); 179 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); 180 ASSERT3U(ds->ds_prev->ds_object, ==, 181 ds->ds_phys->ds_prev_snap_obj); 182 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 183 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 184 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 185 ds->ds_object && bp->blk_birth > 186 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 187 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 188 mutex_enter(&ds->ds_prev->ds_lock); 189 ds->ds_prev->ds_phys->ds_unique_bytes += used; 190 mutex_exit(&ds->ds_prev->ds_lock); 191 } 192 if (bp->blk_birth > ds->ds_origin_txg) { 193 dsl_dir_transfer_space(ds->ds_dir, used, 194 DD_USED_HEAD, DD_USED_SNAP, tx); 195 } 196 } 197 mutex_enter(&ds->ds_lock); 198 ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); 199 ds->ds_phys->ds_used_bytes -= used; 200 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 201 ds->ds_phys->ds_compressed_bytes -= compressed; 202 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 203 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 204 mutex_exit(&ds->ds_lock); 205 206 return (used); 207 } 208 209 uint64_t 210 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 211 { 212 uint64_t trysnap = 0; 213 214 if (ds == NULL) 215 return (0); 216 /* 217 * The snapshot creation could fail, but that would cause an 218 * incorrect FALSE return, which would only result in an 219 * overestimation of the amount of space that an operation would 220 * consume, which is OK. 221 * 222 * There's also a small window where we could miss a pending 223 * snapshot, because we could set the sync task in the quiescing 224 * phase. So this should only be used as a guess. 225 */ 226 if (ds->ds_trysnap_txg > 227 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 228 trysnap = ds->ds_trysnap_txg; 229 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 230 } 231 232 int 233 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) 234 { 235 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); 236 } 237 238 /* ARGSUSED */ 239 static void 240 dsl_dataset_evict(dmu_buf_t *db, void *dsv) 241 { 242 dsl_dataset_t *ds = dsv; 243 244 ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds)); 245 246 dprintf_ds(ds, "evicting %s\n", ""); 247 248 unique_remove(ds->ds_fsid_guid); 249 250 if (ds->ds_user_ptr != NULL) 251 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 252 253 if (ds->ds_prev) { 254 dsl_dataset_drop_ref(ds->ds_prev, ds); 255 ds->ds_prev = NULL; 256 } 257 258 bplist_close(&ds->ds_deadlist); 259 if (ds->ds_dir) 260 dsl_dir_close(ds->ds_dir, ds); 261 262 ASSERT(!list_link_active(&ds->ds_synced_link)); 263 264 mutex_destroy(&ds->ds_lock); 265 mutex_destroy(&ds->ds_opening_lock); 266 mutex_destroy(&ds->ds_deadlist.bpl_lock); 267 rw_destroy(&ds->ds_rwlock); 268 cv_destroy(&ds->ds_exclusive_cv); 269 270 kmem_free(ds, sizeof (dsl_dataset_t)); 271 } 272 273 static int 274 dsl_dataset_get_snapname(dsl_dataset_t *ds) 275 { 276 dsl_dataset_phys_t *headphys; 277 int err; 278 dmu_buf_t *headdbuf; 279 dsl_pool_t *dp = ds->ds_dir->dd_pool; 280 objset_t *mos = dp->dp_meta_objset; 281 282 if (ds->ds_snapname[0]) 283 return (0); 284 if (ds->ds_phys->ds_next_snap_obj == 0) 285 return (0); 286 287 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 288 FTAG, &headdbuf); 289 if (err) 290 return (err); 291 headphys = headdbuf->db_data; 292 err = zap_value_search(dp->dp_meta_objset, 293 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 294 dmu_buf_rele(headdbuf, FTAG); 295 return (err); 296 } 297 298 static int 299 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 300 { 301 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 302 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 303 matchtype_t mt; 304 int err; 305 306 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 307 mt = MT_FIRST; 308 else 309 mt = MT_EXACT; 310 311 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 312 value, mt, NULL, 0, NULL); 313 if (err == ENOTSUP && mt == MT_FIRST) 314 err = zap_lookup(mos, snapobj, name, 8, 1, value); 315 return (err); 316 } 317 318 static int 319 dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx) 320 { 321 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 322 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 323 matchtype_t mt; 324 int err; 325 326 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 327 mt = MT_FIRST; 328 else 329 mt = MT_EXACT; 330 331 err = zap_remove_norm(mos, snapobj, name, mt, tx); 332 if (err == ENOTSUP && mt == MT_FIRST) 333 err = zap_remove(mos, snapobj, name, tx); 334 return (err); 335 } 336 337 static int 338 dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, void *tag, 339 dsl_dataset_t **dsp) 340 { 341 objset_t *mos = dp->dp_meta_objset; 342 dmu_buf_t *dbuf; 343 dsl_dataset_t *ds; 344 int err; 345 346 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 347 dsl_pool_sync_context(dp)); 348 349 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 350 if (err) 351 return (err); 352 ds = dmu_buf_get_user(dbuf); 353 if (ds == NULL) { 354 dsl_dataset_t *winner; 355 356 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 357 ds->ds_dbuf = dbuf; 358 ds->ds_object = dsobj; 359 ds->ds_phys = dbuf->db_data; 360 361 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 362 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 363 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, 364 NULL); 365 rw_init(&ds->ds_rwlock, 0, 0, 0); 366 cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL); 367 368 err = bplist_open(&ds->ds_deadlist, 369 mos, ds->ds_phys->ds_deadlist_obj); 370 if (err == 0) { 371 err = dsl_dir_open_obj(dp, 372 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 373 } 374 if (err) { 375 /* 376 * we don't really need to close the blist if we 377 * just opened it. 378 */ 379 mutex_destroy(&ds->ds_lock); 380 mutex_destroy(&ds->ds_opening_lock); 381 mutex_destroy(&ds->ds_deadlist.bpl_lock); 382 rw_destroy(&ds->ds_rwlock); 383 cv_destroy(&ds->ds_exclusive_cv); 384 kmem_free(ds, sizeof (dsl_dataset_t)); 385 dmu_buf_rele(dbuf, tag); 386 return (err); 387 } 388 389 if (!dsl_dataset_is_snapshot(ds)) { 390 ds->ds_snapname[0] = '\0'; 391 if (ds->ds_phys->ds_prev_snap_obj) { 392 err = dsl_dataset_get_ref(dp, 393 ds->ds_phys->ds_prev_snap_obj, 394 ds, &ds->ds_prev); 395 } 396 397 if (err == 0 && dsl_dir_is_clone(ds->ds_dir)) { 398 dsl_dataset_t *origin; 399 400 err = dsl_dataset_hold_obj(dp, 401 ds->ds_dir->dd_phys->dd_origin_obj, 402 FTAG, &origin); 403 if (err == 0) { 404 ds->ds_origin_txg = 405 origin->ds_phys->ds_creation_txg; 406 dsl_dataset_rele(origin, FTAG); 407 } 408 } 409 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { 410 err = dsl_dataset_get_snapname(ds); 411 } 412 413 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 414 /* 415 * In sync context, we're called with either no lock 416 * or with the write lock. If we're not syncing, 417 * we're always called with the read lock held. 418 */ 419 boolean_t need_lock = 420 !RW_WRITE_HELD(&dp->dp_config_rwlock) && 421 dsl_pool_sync_context(dp); 422 423 if (need_lock) 424 rw_enter(&dp->dp_config_rwlock, RW_READER); 425 426 err = dsl_prop_get_ds(ds, 427 "refreservation", sizeof (uint64_t), 1, 428 &ds->ds_reserved, NULL); 429 if (err == 0) { 430 err = dsl_prop_get_ds(ds, 431 "refquota", sizeof (uint64_t), 1, 432 &ds->ds_quota, NULL); 433 } 434 435 if (need_lock) 436 rw_exit(&dp->dp_config_rwlock); 437 } else { 438 ds->ds_reserved = ds->ds_quota = 0; 439 } 440 441 if (err == 0) { 442 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, 443 dsl_dataset_evict); 444 } 445 if (err || winner) { 446 bplist_close(&ds->ds_deadlist); 447 if (ds->ds_prev) 448 dsl_dataset_drop_ref(ds->ds_prev, ds); 449 dsl_dir_close(ds->ds_dir, ds); 450 mutex_destroy(&ds->ds_lock); 451 mutex_destroy(&ds->ds_opening_lock); 452 mutex_destroy(&ds->ds_deadlist.bpl_lock); 453 rw_destroy(&ds->ds_rwlock); 454 cv_destroy(&ds->ds_exclusive_cv); 455 kmem_free(ds, sizeof (dsl_dataset_t)); 456 if (err) { 457 dmu_buf_rele(dbuf, tag); 458 return (err); 459 } 460 ds = winner; 461 } else { 462 ds->ds_fsid_guid = 463 unique_insert(ds->ds_phys->ds_fsid_guid); 464 } 465 } 466 ASSERT3P(ds->ds_dbuf, ==, dbuf); 467 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 468 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || 469 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 470 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 471 mutex_enter(&ds->ds_lock); 472 if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) { 473 mutex_exit(&ds->ds_lock); 474 dmu_buf_rele(ds->ds_dbuf, tag); 475 return (ENOENT); 476 } 477 mutex_exit(&ds->ds_lock); 478 *dsp = ds; 479 return (0); 480 } 481 482 static int 483 dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag) 484 { 485 dsl_pool_t *dp = ds->ds_dir->dd_pool; 486 487 /* 488 * In syncing context we don't want the rwlock lock: there 489 * may be an existing writer waiting for sync phase to 490 * finish. We don't need to worry about such writers, since 491 * sync phase is single-threaded, so the writer can't be 492 * doing anything while we are active. 493 */ 494 if (dsl_pool_sync_context(dp)) { 495 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 496 return (0); 497 } 498 499 /* 500 * Normal users will hold the ds_rwlock as a READER until they 501 * are finished (i.e., call dsl_dataset_rele()). "Owners" will 502 * drop their READER lock after they set the ds_owner field. 503 * 504 * If the dataset is being destroyed, the destroy thread will 505 * obtain a WRITER lock for exclusive access after it's done its 506 * open-context work and then change the ds_owner to 507 * dsl_reaper once destruction is assured. So threads 508 * may block here temporarily, until the "destructability" of 509 * the dataset is determined. 510 */ 511 ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock)); 512 mutex_enter(&ds->ds_lock); 513 while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) { 514 rw_exit(&dp->dp_config_rwlock); 515 cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock); 516 if (DSL_DATASET_IS_DESTROYED(ds)) { 517 mutex_exit(&ds->ds_lock); 518 dsl_dataset_drop_ref(ds, tag); 519 rw_enter(&dp->dp_config_rwlock, RW_READER); 520 return (ENOENT); 521 } 522 rw_enter(&dp->dp_config_rwlock, RW_READER); 523 } 524 mutex_exit(&ds->ds_lock); 525 return (0); 526 } 527 528 int 529 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 530 dsl_dataset_t **dsp) 531 { 532 int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp); 533 534 if (err) 535 return (err); 536 return (dsl_dataset_hold_ref(*dsp, tag)); 537 } 538 539 int 540 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, int flags, void *owner, 541 dsl_dataset_t **dsp) 542 { 543 int err = dsl_dataset_hold_obj(dp, dsobj, owner, dsp); 544 545 ASSERT(DS_MODE_TYPE(flags) != DS_MODE_USER); 546 547 if (err) 548 return (err); 549 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 550 dsl_dataset_rele(*dsp, owner); 551 return (EBUSY); 552 } 553 return (0); 554 } 555 556 int 557 dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp) 558 { 559 dsl_dir_t *dd; 560 dsl_pool_t *dp; 561 const char *snapname; 562 uint64_t obj; 563 int err = 0; 564 565 err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname); 566 if (err) 567 return (err); 568 569 dp = dd->dd_pool; 570 obj = dd->dd_phys->dd_head_dataset_obj; 571 rw_enter(&dp->dp_config_rwlock, RW_READER); 572 if (obj) 573 err = dsl_dataset_get_ref(dp, obj, tag, dsp); 574 else 575 err = ENOENT; 576 if (err) 577 goto out; 578 579 err = dsl_dataset_hold_ref(*dsp, tag); 580 581 /* we may be looking for a snapshot */ 582 if (err == 0 && snapname != NULL) { 583 dsl_dataset_t *ds = NULL; 584 585 if (*snapname++ != '@') { 586 dsl_dataset_rele(*dsp, tag); 587 err = ENOENT; 588 goto out; 589 } 590 591 dprintf("looking for snapshot '%s'\n", snapname); 592 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 593 if (err == 0) 594 err = dsl_dataset_get_ref(dp, obj, tag, &ds); 595 dsl_dataset_rele(*dsp, tag); 596 597 ASSERT3U((err == 0), ==, (ds != NULL)); 598 599 if (ds) { 600 mutex_enter(&ds->ds_lock); 601 if (ds->ds_snapname[0] == 0) 602 (void) strlcpy(ds->ds_snapname, snapname, 603 sizeof (ds->ds_snapname)); 604 mutex_exit(&ds->ds_lock); 605 err = dsl_dataset_hold_ref(ds, tag); 606 *dsp = err ? NULL : ds; 607 } 608 } 609 out: 610 rw_exit(&dp->dp_config_rwlock); 611 dsl_dir_close(dd, FTAG); 612 return (err); 613 } 614 615 int 616 dsl_dataset_own(const char *name, int flags, void *owner, dsl_dataset_t **dsp) 617 { 618 int err = dsl_dataset_hold(name, owner, dsp); 619 if (err) 620 return (err); 621 if ((*dsp)->ds_phys->ds_num_children > 0 && 622 !DS_MODE_IS_READONLY(flags)) { 623 dsl_dataset_rele(*dsp, owner); 624 return (EROFS); 625 } 626 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 627 dsl_dataset_rele(*dsp, owner); 628 return (EBUSY); 629 } 630 return (0); 631 } 632 633 void 634 dsl_dataset_name(dsl_dataset_t *ds, char *name) 635 { 636 if (ds == NULL) { 637 (void) strcpy(name, "mos"); 638 } else { 639 dsl_dir_name(ds->ds_dir, name); 640 VERIFY(0 == dsl_dataset_get_snapname(ds)); 641 if (ds->ds_snapname[0]) { 642 (void) strcat(name, "@"); 643 /* 644 * We use a "recursive" mutex so that we 645 * can call dprintf_ds() with ds_lock held. 646 */ 647 if (!MUTEX_HELD(&ds->ds_lock)) { 648 mutex_enter(&ds->ds_lock); 649 (void) strcat(name, ds->ds_snapname); 650 mutex_exit(&ds->ds_lock); 651 } else { 652 (void) strcat(name, ds->ds_snapname); 653 } 654 } 655 } 656 } 657 658 static int 659 dsl_dataset_namelen(dsl_dataset_t *ds) 660 { 661 int result; 662 663 if (ds == NULL) { 664 result = 3; /* "mos" */ 665 } else { 666 result = dsl_dir_namelen(ds->ds_dir); 667 VERIFY(0 == dsl_dataset_get_snapname(ds)); 668 if (ds->ds_snapname[0]) { 669 ++result; /* adding one for the @-sign */ 670 if (!MUTEX_HELD(&ds->ds_lock)) { 671 mutex_enter(&ds->ds_lock); 672 result += strlen(ds->ds_snapname); 673 mutex_exit(&ds->ds_lock); 674 } else { 675 result += strlen(ds->ds_snapname); 676 } 677 } 678 } 679 680 return (result); 681 } 682 683 void 684 dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag) 685 { 686 dmu_buf_rele(ds->ds_dbuf, tag); 687 } 688 689 void 690 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 691 { 692 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) { 693 rw_exit(&ds->ds_rwlock); 694 } 695 dsl_dataset_drop_ref(ds, tag); 696 } 697 698 void 699 dsl_dataset_disown(dsl_dataset_t *ds, void *owner) 700 { 701 ASSERT((ds->ds_owner == owner && ds->ds_dbuf) || 702 (DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL)); 703 704 mutex_enter(&ds->ds_lock); 705 ds->ds_owner = NULL; 706 if (RW_WRITE_HELD(&ds->ds_rwlock)) { 707 rw_exit(&ds->ds_rwlock); 708 cv_broadcast(&ds->ds_exclusive_cv); 709 } 710 mutex_exit(&ds->ds_lock); 711 if (ds->ds_dbuf) 712 dsl_dataset_drop_ref(ds, owner); 713 else 714 dsl_dataset_evict(ds->ds_dbuf, ds); 715 } 716 717 boolean_t 718 dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *owner) 719 { 720 boolean_t gotit = FALSE; 721 722 mutex_enter(&ds->ds_lock); 723 if (ds->ds_owner == NULL && 724 (!DS_IS_INCONSISTENT(ds) || inconsistentok)) { 725 ds->ds_owner = owner; 726 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) 727 rw_exit(&ds->ds_rwlock); 728 gotit = TRUE; 729 } 730 mutex_exit(&ds->ds_lock); 731 return (gotit); 732 } 733 734 void 735 dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner) 736 { 737 ASSERT3P(owner, ==, ds->ds_owner); 738 if (!RW_WRITE_HELD(&ds->ds_rwlock)) 739 rw_enter(&ds->ds_rwlock, RW_WRITER); 740 } 741 742 uint64_t 743 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 744 uint64_t flags, dmu_tx_t *tx) 745 { 746 dsl_pool_t *dp = dd->dd_pool; 747 dmu_buf_t *dbuf; 748 dsl_dataset_phys_t *dsphys; 749 uint64_t dsobj; 750 objset_t *mos = dp->dp_meta_objset; 751 752 if (origin == NULL) 753 origin = dp->dp_origin_snap; 754 755 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 756 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 757 ASSERT(dmu_tx_is_syncing(tx)); 758 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 759 760 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 761 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 762 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 763 dmu_buf_will_dirty(dbuf, tx); 764 dsphys = dbuf->db_data; 765 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 766 dsphys->ds_dir_obj = dd->dd_object; 767 dsphys->ds_flags = flags; 768 dsphys->ds_fsid_guid = unique_create(); 769 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 770 sizeof (dsphys->ds_guid)); 771 dsphys->ds_snapnames_zapobj = 772 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 773 DMU_OT_NONE, 0, tx); 774 dsphys->ds_creation_time = gethrestime_sec(); 775 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 776 dsphys->ds_deadlist_obj = 777 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 778 779 if (origin) { 780 dsphys->ds_prev_snap_obj = origin->ds_object; 781 dsphys->ds_prev_snap_txg = 782 origin->ds_phys->ds_creation_txg; 783 dsphys->ds_used_bytes = 784 origin->ds_phys->ds_used_bytes; 785 dsphys->ds_compressed_bytes = 786 origin->ds_phys->ds_compressed_bytes; 787 dsphys->ds_uncompressed_bytes = 788 origin->ds_phys->ds_uncompressed_bytes; 789 dsphys->ds_bp = origin->ds_phys->ds_bp; 790 dsphys->ds_flags |= origin->ds_phys->ds_flags; 791 792 dmu_buf_will_dirty(origin->ds_dbuf, tx); 793 origin->ds_phys->ds_num_children++; 794 795 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 796 if (origin->ds_phys->ds_next_clones_obj == 0) { 797 origin->ds_phys->ds_next_clones_obj = 798 zap_create(mos, 799 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 800 } 801 VERIFY(0 == zap_add_int(mos, 802 origin->ds_phys->ds_next_clones_obj, 803 dsobj, tx)); 804 } 805 806 dmu_buf_will_dirty(dd->dd_dbuf, tx); 807 dd->dd_phys->dd_origin_obj = origin->ds_object; 808 } 809 810 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 811 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 812 813 dmu_buf_rele(dbuf, FTAG); 814 815 dmu_buf_will_dirty(dd->dd_dbuf, tx); 816 dd->dd_phys->dd_head_dataset_obj = dsobj; 817 818 return (dsobj); 819 } 820 821 uint64_t 822 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 823 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 824 { 825 dsl_pool_t *dp = pdd->dd_pool; 826 uint64_t dsobj, ddobj; 827 dsl_dir_t *dd; 828 829 ASSERT(lastname[0] != '@'); 830 831 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 832 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); 833 834 dsobj = dsl_dataset_create_sync_dd(dd, origin, flags, tx); 835 836 dsl_deleg_set_create_perms(dd, tx, cr); 837 838 dsl_dir_close(dd, FTAG); 839 840 return (dsobj); 841 } 842 843 struct destroyarg { 844 dsl_sync_task_group_t *dstg; 845 char *snapname; 846 char *failed; 847 }; 848 849 static int 850 dsl_snapshot_destroy_one(char *name, void *arg) 851 { 852 struct destroyarg *da = arg; 853 dsl_dataset_t *ds; 854 char *cp; 855 int err; 856 857 (void) strcat(name, "@"); 858 (void) strcat(name, da->snapname); 859 err = dsl_dataset_own(name, DS_MODE_READONLY | DS_MODE_INCONSISTENT, 860 da->dstg, &ds); 861 cp = strchr(name, '@'); 862 *cp = '\0'; 863 if (err == 0) { 864 dsl_dataset_make_exclusive(ds, da->dstg); 865 if (ds->ds_user_ptr) { 866 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 867 ds->ds_user_ptr = NULL; 868 } 869 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, 870 dsl_dataset_destroy_sync, ds, da->dstg, 0); 871 } else if (err == ENOENT) { 872 err = 0; 873 } else { 874 (void) strcpy(da->failed, name); 875 } 876 return (err); 877 } 878 879 /* 880 * Destroy 'snapname' in all descendants of 'fsname'. 881 */ 882 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy 883 int 884 dsl_snapshots_destroy(char *fsname, char *snapname) 885 { 886 int err; 887 struct destroyarg da; 888 dsl_sync_task_t *dst; 889 spa_t *spa; 890 891 err = spa_open(fsname, &spa, FTAG); 892 if (err) 893 return (err); 894 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 895 da.snapname = snapname; 896 da.failed = fsname; 897 898 err = dmu_objset_find(fsname, 899 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); 900 901 if (err == 0) 902 err = dsl_sync_task_group_wait(da.dstg); 903 904 for (dst = list_head(&da.dstg->dstg_tasks); dst; 905 dst = list_next(&da.dstg->dstg_tasks, dst)) { 906 dsl_dataset_t *ds = dst->dst_arg1; 907 /* 908 * Return the file system name that triggered the error 909 */ 910 if (dst->dst_err) { 911 dsl_dataset_name(ds, fsname); 912 *strchr(fsname, '@') = '\0'; 913 } 914 dsl_dataset_disown(ds, da.dstg); 915 } 916 917 dsl_sync_task_group_destroy(da.dstg); 918 spa_close(spa, FTAG); 919 return (err); 920 } 921 922 /* 923 * ds must be opened as OWNER. On return (whether successful or not), 924 * ds will be closed and caller can no longer dereference it. 925 */ 926 int 927 dsl_dataset_destroy(dsl_dataset_t *ds, void *tag) 928 { 929 int err; 930 dsl_sync_task_group_t *dstg; 931 objset_t *os; 932 dsl_dir_t *dd; 933 uint64_t obj; 934 935 if (dsl_dataset_is_snapshot(ds)) { 936 /* Destroying a snapshot is simpler */ 937 dsl_dataset_make_exclusive(ds, tag); 938 939 if (ds->ds_user_ptr) { 940 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 941 ds->ds_user_ptr = NULL; 942 } 943 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 944 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, 945 ds, tag, 0); 946 goto out; 947 } 948 949 dd = ds->ds_dir; 950 951 /* 952 * Check for errors and mark this ds as inconsistent, in 953 * case we crash while freeing the objects. 954 */ 955 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, 956 dsl_dataset_destroy_begin_sync, ds, NULL, 0); 957 if (err) 958 goto out; 959 960 err = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); 961 if (err) 962 goto out; 963 964 /* 965 * remove the objects in open context, so that we won't 966 * have too much to do in syncing context. 967 */ 968 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 969 ds->ds_phys->ds_prev_snap_txg)) { 970 /* 971 * Ignore errors, if there is not enough disk space 972 * we will deal with it in dsl_dataset_destroy_sync(). 973 */ 974 (void) dmu_free_object(os, obj); 975 } 976 977 dmu_objset_close(os); 978 if (err != ESRCH) 979 goto out; 980 981 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 982 err = dsl_dir_open_obj(dd->dd_pool, dd->dd_object, NULL, FTAG, &dd); 983 rw_exit(&dd->dd_pool->dp_config_rwlock); 984 985 if (err) 986 goto out; 987 988 if (ds->ds_user_ptr) { 989 /* 990 * We need to sync out all in-flight IO before we try 991 * to evict (the dataset evict func is trying to clear 992 * the cached entries for this dataset in the ARC). 993 */ 994 txg_wait_synced(dd->dd_pool, 0); 995 } 996 997 /* 998 * Blow away the dsl_dir + head dataset. 999 */ 1000 dsl_dataset_make_exclusive(ds, tag); 1001 if (ds->ds_user_ptr) { 1002 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 1003 ds->ds_user_ptr = NULL; 1004 } 1005 dstg = dsl_sync_task_group_create(ds->ds_dir->dd_pool); 1006 dsl_sync_task_create(dstg, dsl_dataset_destroy_check, 1007 dsl_dataset_destroy_sync, ds, tag, 0); 1008 dsl_sync_task_create(dstg, dsl_dir_destroy_check, 1009 dsl_dir_destroy_sync, dd, FTAG, 0); 1010 err = dsl_sync_task_group_wait(dstg); 1011 dsl_sync_task_group_destroy(dstg); 1012 /* if it is successful, dsl_dir_destroy_sync will close the dd */ 1013 if (err) 1014 dsl_dir_close(dd, FTAG); 1015 out: 1016 dsl_dataset_disown(ds, tag); 1017 return (err); 1018 } 1019 1020 int 1021 dsl_dataset_rollback(dsl_dataset_t *ds, dmu_objset_type_t ost) 1022 { 1023 int err; 1024 1025 ASSERT(ds->ds_owner); 1026 1027 dsl_dataset_make_exclusive(ds, ds->ds_owner); 1028 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 1029 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, 1030 ds, &ost, 0); 1031 /* drop exclusive access */ 1032 mutex_enter(&ds->ds_lock); 1033 rw_exit(&ds->ds_rwlock); 1034 cv_broadcast(&ds->ds_exclusive_cv); 1035 mutex_exit(&ds->ds_lock); 1036 return (err); 1037 } 1038 1039 void * 1040 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, 1041 void *p, dsl_dataset_evict_func_t func) 1042 { 1043 void *old; 1044 1045 mutex_enter(&ds->ds_lock); 1046 old = ds->ds_user_ptr; 1047 if (old == NULL) { 1048 ds->ds_user_ptr = p; 1049 ds->ds_user_evict_func = func; 1050 } 1051 mutex_exit(&ds->ds_lock); 1052 return (old); 1053 } 1054 1055 void * 1056 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) 1057 { 1058 return (ds->ds_user_ptr); 1059 } 1060 1061 1062 blkptr_t * 1063 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1064 { 1065 return (&ds->ds_phys->ds_bp); 1066 } 1067 1068 void 1069 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1070 { 1071 ASSERT(dmu_tx_is_syncing(tx)); 1072 /* If it's the meta-objset, set dp_meta_rootbp */ 1073 if (ds == NULL) { 1074 tx->tx_pool->dp_meta_rootbp = *bp; 1075 } else { 1076 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1077 ds->ds_phys->ds_bp = *bp; 1078 } 1079 } 1080 1081 spa_t * 1082 dsl_dataset_get_spa(dsl_dataset_t *ds) 1083 { 1084 return (ds->ds_dir->dd_pool->dp_spa); 1085 } 1086 1087 void 1088 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1089 { 1090 dsl_pool_t *dp; 1091 1092 if (ds == NULL) /* this is the meta-objset */ 1093 return; 1094 1095 ASSERT(ds->ds_user_ptr != NULL); 1096 1097 if (ds->ds_phys->ds_next_snap_obj != 0) 1098 panic("dirtying snapshot!"); 1099 1100 dp = ds->ds_dir->dd_pool; 1101 1102 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { 1103 /* up the hold count until we can be written out */ 1104 dmu_buf_add_ref(ds->ds_dbuf, ds); 1105 } 1106 } 1107 1108 /* 1109 * The unique space in the head dataset can be calculated by subtracting 1110 * the space used in the most recent snapshot, that is still being used 1111 * in this file system, from the space currently in use. To figure out 1112 * the space in the most recent snapshot still in use, we need to take 1113 * the total space used in the snapshot and subtract out the space that 1114 * has been freed up since the snapshot was taken. 1115 */ 1116 static void 1117 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1118 { 1119 uint64_t mrs_used; 1120 uint64_t dlused, dlcomp, dluncomp; 1121 1122 ASSERT(ds->ds_object == ds->ds_dir->dd_phys->dd_head_dataset_obj); 1123 1124 if (ds->ds_phys->ds_prev_snap_obj != 0) 1125 mrs_used = ds->ds_prev->ds_phys->ds_used_bytes; 1126 else 1127 mrs_used = 0; 1128 1129 VERIFY(0 == bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, 1130 &dluncomp)); 1131 1132 ASSERT3U(dlused, <=, mrs_used); 1133 ds->ds_phys->ds_unique_bytes = 1134 ds->ds_phys->ds_used_bytes - (mrs_used - dlused); 1135 1136 if (!DS_UNIQUE_IS_ACCURATE(ds) && 1137 spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1138 SPA_VERSION_UNIQUE_ACCURATE) 1139 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1140 } 1141 1142 static uint64_t 1143 dsl_dataset_unique(dsl_dataset_t *ds) 1144 { 1145 if (!DS_UNIQUE_IS_ACCURATE(ds) && !dsl_dataset_is_snapshot(ds)) 1146 dsl_dataset_recalc_head_uniq(ds); 1147 1148 return (ds->ds_phys->ds_unique_bytes); 1149 } 1150 1151 struct killarg { 1152 dsl_dataset_t *ds; 1153 zio_t *zio; 1154 dmu_tx_t *tx; 1155 }; 1156 1157 /* ARGSUSED */ 1158 static int 1159 kill_blkptr(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb, 1160 const dnode_phys_t *dnp, void *arg) 1161 { 1162 struct killarg *ka = arg; 1163 1164 if (bp == NULL) 1165 return (0); 1166 1167 if ((zb->zb_level == -1ULL && zb->zb_blkid != 0) || 1168 (zb->zb_object != 0 && dnp == NULL)) { 1169 /* 1170 * It's a block in the intent log. It has no 1171 * accounting, so just free it. 1172 */ 1173 VERIFY3U(0, ==, dsl_free(ka->zio, ka->tx->tx_pool, 1174 ka->tx->tx_txg, bp, NULL, NULL, ARC_NOWAIT)); 1175 } else { 1176 ASSERT3U(bp->blk_birth, >, ka->ds->ds_phys->ds_prev_snap_txg); 1177 (void) dsl_dataset_block_kill(ka->ds, bp, ka->zio, ka->tx); 1178 } 1179 1180 return (0); 1181 } 1182 1183 /* ARGSUSED */ 1184 static int 1185 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) 1186 { 1187 dsl_dataset_t *ds = arg1; 1188 dmu_objset_type_t *ost = arg2; 1189 1190 /* 1191 * We can only roll back to emptyness if it is a ZPL objset. 1192 */ 1193 if (*ost != DMU_OST_ZFS && ds->ds_phys->ds_prev_snap_txg == 0) 1194 return (EINVAL); 1195 1196 /* 1197 * This must not be a snapshot. 1198 */ 1199 if (ds->ds_phys->ds_next_snap_obj != 0) 1200 return (EINVAL); 1201 1202 /* 1203 * If we made changes this txg, traverse_dataset won't find 1204 * them. Try again. 1205 */ 1206 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1207 return (EAGAIN); 1208 1209 return (0); 1210 } 1211 1212 /* ARGSUSED */ 1213 static void 1214 dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1215 { 1216 dsl_dataset_t *ds = arg1; 1217 dmu_objset_type_t *ost = arg2; 1218 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1219 1220 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1221 1222 if (ds->ds_user_ptr != NULL) { 1223 /* 1224 * We need to make sure that the objset_impl_t is reopened after 1225 * we do the rollback, otherwise it will have the wrong 1226 * objset_phys_t. Normally this would happen when this 1227 * dataset-open is closed, thus causing the 1228 * dataset to be immediately evicted. But when doing "zfs recv 1229 * -F", we reopen the objset before that, so that there is no 1230 * window where the dataset is closed and inconsistent. 1231 */ 1232 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 1233 ds->ds_user_ptr = NULL; 1234 } 1235 1236 /* Transfer space that was freed since last snap back to the head. */ 1237 { 1238 uint64_t used; 1239 1240 VERIFY(0 == bplist_space_birthrange(&ds->ds_deadlist, 1241 ds->ds_origin_txg, UINT64_MAX, &used)); 1242 dsl_dir_transfer_space(ds->ds_dir, used, 1243 DD_USED_SNAP, DD_USED_HEAD, tx); 1244 } 1245 1246 /* Zero out the deadlist. */ 1247 bplist_close(&ds->ds_deadlist); 1248 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1249 ds->ds_phys->ds_deadlist_obj = 1250 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1251 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1252 ds->ds_phys->ds_deadlist_obj)); 1253 1254 { 1255 /* 1256 * Free blkptrs that we gave birth to - this covers 1257 * claimed but not played log blocks too. 1258 */ 1259 zio_t *zio; 1260 struct killarg ka; 1261 1262 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, 1263 ZIO_FLAG_MUSTSUCCEED); 1264 ka.ds = ds; 1265 ka.zio = zio; 1266 ka.tx = tx; 1267 (void) traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1268 TRAVERSE_POST, kill_blkptr, &ka); 1269 (void) zio_wait(zio); 1270 } 1271 1272 ASSERT(!(ds->ds_phys->ds_flags & DS_FLAG_UNIQUE_ACCURATE) || 1273 ds->ds_phys->ds_unique_bytes == 0); 1274 1275 if (ds->ds_prev && ds->ds_prev != ds->ds_dir->dd_pool->dp_origin_snap) { 1276 /* Change our contents to that of the prev snapshot */ 1277 1278 ASSERT3U(ds->ds_prev->ds_object, ==, 1279 ds->ds_phys->ds_prev_snap_obj); 1280 ASSERT3U(ds->ds_phys->ds_used_bytes, <=, 1281 ds->ds_prev->ds_phys->ds_used_bytes); 1282 1283 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; 1284 ds->ds_phys->ds_used_bytes = 1285 ds->ds_prev->ds_phys->ds_used_bytes; 1286 ds->ds_phys->ds_compressed_bytes = 1287 ds->ds_prev->ds_phys->ds_compressed_bytes; 1288 ds->ds_phys->ds_uncompressed_bytes = 1289 ds->ds_prev->ds_phys->ds_uncompressed_bytes; 1290 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; 1291 1292 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1293 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1294 ds->ds_prev->ds_phys->ds_unique_bytes = 0; 1295 } 1296 } else { 1297 objset_impl_t *osi; 1298 1299 ASSERT3U(ds->ds_phys->ds_used_bytes, ==, 0); 1300 ASSERT3U(ds->ds_phys->ds_compressed_bytes, ==, 0); 1301 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, ==, 0); 1302 1303 bzero(&ds->ds_phys->ds_bp, sizeof (blkptr_t)); 1304 ds->ds_phys->ds_flags = 0; 1305 ds->ds_phys->ds_unique_bytes = 0; 1306 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1307 SPA_VERSION_UNIQUE_ACCURATE) 1308 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1309 1310 osi = dmu_objset_create_impl(ds->ds_dir->dd_pool->dp_spa, ds, 1311 &ds->ds_phys->ds_bp, *ost, tx); 1312 #ifdef _KERNEL 1313 zfs_create_fs(&osi->os, kcred, NULL, tx); 1314 #endif 1315 } 1316 1317 spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, 1318 tx, cr, "dataset = %llu", ds->ds_object); 1319 } 1320 1321 /* ARGSUSED */ 1322 static int 1323 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) 1324 { 1325 dsl_dataset_t *ds = arg1; 1326 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1327 uint64_t count; 1328 int err; 1329 1330 /* 1331 * Can't delete a head dataset if there are snapshots of it. 1332 * (Except if the only snapshots are from the branch we cloned 1333 * from.) 1334 */ 1335 if (ds->ds_prev != NULL && 1336 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1337 return (EINVAL); 1338 1339 /* 1340 * This is really a dsl_dir thing, but check it here so that 1341 * we'll be less likely to leave this dataset inconsistent & 1342 * nearly destroyed. 1343 */ 1344 err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count); 1345 if (err) 1346 return (err); 1347 if (count != 0) 1348 return (EEXIST); 1349 1350 return (0); 1351 } 1352 1353 /* ARGSUSED */ 1354 static void 1355 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1356 { 1357 dsl_dataset_t *ds = arg1; 1358 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1359 1360 /* Mark it as inconsistent on-disk, in case we crash */ 1361 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1362 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 1363 1364 spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, 1365 cr, "dataset = %llu", ds->ds_object); 1366 } 1367 1368 /* ARGSUSED */ 1369 int 1370 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) 1371 { 1372 dsl_dataset_t *ds = arg1; 1373 1374 /* we have an owner hold, so noone else can destroy us */ 1375 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 1376 1377 /* Can't delete a branch point. */ 1378 if (ds->ds_phys->ds_num_children > 1) 1379 return (EEXIST); 1380 1381 /* 1382 * Can't delete a head dataset if there are snapshots of it. 1383 * (Except if the only snapshots are from the branch we cloned 1384 * from.) 1385 */ 1386 if (ds->ds_prev != NULL && 1387 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1388 return (EINVAL); 1389 1390 /* 1391 * If we made changes this txg, traverse_dsl_dataset won't find 1392 * them. Try again. 1393 */ 1394 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1395 return (EAGAIN); 1396 1397 /* XXX we should do some i/o error checking... */ 1398 return (0); 1399 } 1400 1401 struct refsarg { 1402 kmutex_t lock; 1403 boolean_t gone; 1404 kcondvar_t cv; 1405 }; 1406 1407 /* ARGSUSED */ 1408 static void 1409 dsl_dataset_refs_gone(dmu_buf_t *db, void *argv) 1410 { 1411 struct refsarg *arg = argv; 1412 1413 mutex_enter(&arg->lock); 1414 arg->gone = TRUE; 1415 cv_signal(&arg->cv); 1416 mutex_exit(&arg->lock); 1417 } 1418 1419 static void 1420 dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag) 1421 { 1422 struct refsarg arg; 1423 1424 mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL); 1425 cv_init(&arg.cv, NULL, CV_DEFAULT, NULL); 1426 arg.gone = FALSE; 1427 (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys, 1428 dsl_dataset_refs_gone); 1429 dmu_buf_rele(ds->ds_dbuf, tag); 1430 mutex_enter(&arg.lock); 1431 while (!arg.gone) 1432 cv_wait(&arg.cv, &arg.lock); 1433 ASSERT(arg.gone); 1434 mutex_exit(&arg.lock); 1435 ds->ds_dbuf = NULL; 1436 ds->ds_phys = NULL; 1437 mutex_destroy(&arg.lock); 1438 cv_destroy(&arg.cv); 1439 } 1440 1441 void 1442 dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) 1443 { 1444 dsl_dataset_t *ds = arg1; 1445 zio_t *zio; 1446 int err; 1447 int after_branch_point = FALSE; 1448 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1449 objset_t *mos = dp->dp_meta_objset; 1450 dsl_dataset_t *ds_prev = NULL; 1451 uint64_t obj; 1452 1453 ASSERT(ds->ds_owner); 1454 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 1455 ASSERT(ds->ds_prev == NULL || 1456 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); 1457 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); 1458 1459 /* signal any waiters that this dataset is going away */ 1460 mutex_enter(&ds->ds_lock); 1461 ds->ds_owner = dsl_reaper; 1462 cv_broadcast(&ds->ds_exclusive_cv); 1463 mutex_exit(&ds->ds_lock); 1464 1465 /* Remove our reservation */ 1466 if (ds->ds_reserved != 0) { 1467 uint64_t val = 0; 1468 dsl_dataset_set_reservation_sync(ds, &val, cr, tx); 1469 ASSERT3U(ds->ds_reserved, ==, 0); 1470 } 1471 1472 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1473 1474 dsl_pool_ds_destroyed(ds, tx); 1475 1476 obj = ds->ds_object; 1477 1478 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1479 if (ds->ds_prev) { 1480 ds_prev = ds->ds_prev; 1481 } else { 1482 VERIFY(0 == dsl_dataset_hold_obj(dp, 1483 ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev)); 1484 } 1485 after_branch_point = 1486 (ds_prev->ds_phys->ds_next_snap_obj != obj); 1487 1488 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); 1489 if (after_branch_point && 1490 ds_prev->ds_phys->ds_next_clones_obj != 0) { 1491 VERIFY(0 == zap_remove_int(mos, 1492 ds_prev->ds_phys->ds_next_clones_obj, obj, tx)); 1493 if (ds->ds_phys->ds_next_snap_obj != 0) { 1494 VERIFY(0 == zap_add_int(mos, 1495 ds_prev->ds_phys->ds_next_clones_obj, 1496 ds->ds_phys->ds_next_snap_obj, tx)); 1497 } 1498 } 1499 if (after_branch_point && 1500 ds->ds_phys->ds_next_snap_obj == 0) { 1501 /* This clone is toast. */ 1502 ASSERT(ds_prev->ds_phys->ds_num_children > 1); 1503 ds_prev->ds_phys->ds_num_children--; 1504 } else if (!after_branch_point) { 1505 ds_prev->ds_phys->ds_next_snap_obj = 1506 ds->ds_phys->ds_next_snap_obj; 1507 } 1508 } 1509 1510 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1511 1512 if (ds->ds_phys->ds_next_snap_obj != 0) { 1513 blkptr_t bp; 1514 dsl_dataset_t *ds_next; 1515 uint64_t itor = 0; 1516 uint64_t old_unique; 1517 int64_t used = 0, compressed = 0, uncompressed = 0; 1518 1519 VERIFY(0 == dsl_dataset_hold_obj(dp, 1520 ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next)); 1521 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); 1522 1523 old_unique = dsl_dataset_unique(ds_next); 1524 1525 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); 1526 ds_next->ds_phys->ds_prev_snap_obj = 1527 ds->ds_phys->ds_prev_snap_obj; 1528 ds_next->ds_phys->ds_prev_snap_txg = 1529 ds->ds_phys->ds_prev_snap_txg; 1530 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1531 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); 1532 1533 /* 1534 * Transfer to our deadlist (which will become next's 1535 * new deadlist) any entries from next's current 1536 * deadlist which were born before prev, and free the 1537 * other entries. 1538 * 1539 * XXX we're doing this long task with the config lock held 1540 */ 1541 while (bplist_iterate(&ds_next->ds_deadlist, &itor, &bp) == 0) { 1542 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { 1543 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, 1544 &bp, tx)); 1545 if (ds_prev && !after_branch_point && 1546 bp.blk_birth > 1547 ds_prev->ds_phys->ds_prev_snap_txg) { 1548 ds_prev->ds_phys->ds_unique_bytes += 1549 bp_get_dasize(dp->dp_spa, &bp); 1550 } 1551 } else { 1552 used += bp_get_dasize(dp->dp_spa, &bp); 1553 compressed += BP_GET_PSIZE(&bp); 1554 uncompressed += BP_GET_UCSIZE(&bp); 1555 /* XXX check return value? */ 1556 (void) dsl_free(zio, dp, tx->tx_txg, 1557 &bp, NULL, NULL, ARC_NOWAIT); 1558 } 1559 } 1560 1561 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); 1562 1563 /* change snapused */ 1564 dsl_dir_diduse_space(ds->ds_dir, DD_USED_SNAP, 1565 -used, -compressed, -uncompressed, tx); 1566 1567 /* free next's deadlist */ 1568 bplist_close(&ds_next->ds_deadlist); 1569 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); 1570 1571 /* set next's deadlist to our deadlist */ 1572 bplist_close(&ds->ds_deadlist); 1573 ds_next->ds_phys->ds_deadlist_obj = 1574 ds->ds_phys->ds_deadlist_obj; 1575 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, 1576 ds_next->ds_phys->ds_deadlist_obj)); 1577 ds->ds_phys->ds_deadlist_obj = 0; 1578 1579 if (ds_next->ds_phys->ds_next_snap_obj != 0) { 1580 /* 1581 * Update next's unique to include blocks which 1582 * were previously shared by only this snapshot 1583 * and it. Those blocks will be born after the 1584 * prev snap and before this snap, and will have 1585 * died after the next snap and before the one 1586 * after that (ie. be on the snap after next's 1587 * deadlist). 1588 * 1589 * XXX we're doing this long task with the 1590 * config lock held 1591 */ 1592 dsl_dataset_t *ds_after_next; 1593 uint64_t space; 1594 1595 VERIFY(0 == dsl_dataset_hold_obj(dp, 1596 ds_next->ds_phys->ds_next_snap_obj, 1597 FTAG, &ds_after_next)); 1598 1599 VERIFY(0 == 1600 bplist_space_birthrange(&ds_after_next->ds_deadlist, 1601 ds->ds_phys->ds_prev_snap_txg, 1602 ds->ds_phys->ds_creation_txg, &space)); 1603 ds_next->ds_phys->ds_unique_bytes += space; 1604 1605 dsl_dataset_rele(ds_after_next, FTAG); 1606 ASSERT3P(ds_next->ds_prev, ==, NULL); 1607 } else { 1608 ASSERT3P(ds_next->ds_prev, ==, ds); 1609 dsl_dataset_drop_ref(ds_next->ds_prev, ds_next); 1610 ds_next->ds_prev = NULL; 1611 if (ds_prev) { 1612 VERIFY(0 == dsl_dataset_get_ref(dp, 1613 ds->ds_phys->ds_prev_snap_obj, 1614 ds_next, &ds_next->ds_prev)); 1615 } 1616 1617 dsl_dataset_recalc_head_uniq(ds_next); 1618 1619 /* 1620 * Reduce the amount of our unconsmed refreservation 1621 * being charged to our parent by the amount of 1622 * new unique data we have gained. 1623 */ 1624 if (old_unique < ds_next->ds_reserved) { 1625 int64_t mrsdelta; 1626 uint64_t new_unique = 1627 ds_next->ds_phys->ds_unique_bytes; 1628 1629 ASSERT(old_unique <= new_unique); 1630 mrsdelta = MIN(new_unique - old_unique, 1631 ds_next->ds_reserved - old_unique); 1632 dsl_dir_diduse_space(ds->ds_dir, 1633 DD_USED_REFRSRV, -mrsdelta, 0, 0, tx); 1634 } 1635 } 1636 dsl_dataset_rele(ds_next, FTAG); 1637 } else { 1638 /* 1639 * There's no next snapshot, so this is a head dataset. 1640 * Destroy the deadlist. Unless it's a clone, the 1641 * deadlist should be empty. (If it's a clone, it's 1642 * safe to ignore the deadlist contents.) 1643 */ 1644 struct killarg ka; 1645 1646 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); 1647 bplist_close(&ds->ds_deadlist); 1648 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1649 ds->ds_phys->ds_deadlist_obj = 0; 1650 1651 /* 1652 * Free everything that we point to (that's born after 1653 * the previous snapshot, if we are a clone) 1654 * 1655 * NB: this should be very quick, because we already 1656 * freed all the objects in open context. 1657 */ 1658 ka.ds = ds; 1659 ka.zio = zio; 1660 ka.tx = tx; 1661 err = traverse_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1662 TRAVERSE_POST, kill_blkptr, &ka); 1663 ASSERT3U(err, ==, 0); 1664 ASSERT(spa_version(dp->dp_spa) < SPA_VERSION_UNIQUE_ACCURATE || 1665 ds->ds_phys->ds_unique_bytes == 0); 1666 } 1667 1668 err = zio_wait(zio); 1669 ASSERT3U(err, ==, 0); 1670 1671 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { 1672 /* Erase the link in the dir */ 1673 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 1674 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; 1675 ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0); 1676 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); 1677 ASSERT(err == 0); 1678 } else { 1679 /* remove from snapshot namespace */ 1680 dsl_dataset_t *ds_head; 1681 ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0); 1682 VERIFY(0 == dsl_dataset_hold_obj(dp, 1683 ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head)); 1684 VERIFY(0 == dsl_dataset_get_snapname(ds)); 1685 #ifdef ZFS_DEBUG 1686 { 1687 uint64_t val; 1688 1689 err = dsl_dataset_snap_lookup(ds_head, 1690 ds->ds_snapname, &val); 1691 ASSERT3U(err, ==, 0); 1692 ASSERT3U(val, ==, obj); 1693 } 1694 #endif 1695 err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx); 1696 ASSERT(err == 0); 1697 dsl_dataset_rele(ds_head, FTAG); 1698 } 1699 1700 if (ds_prev && ds->ds_prev != ds_prev) 1701 dsl_dataset_rele(ds_prev, FTAG); 1702 1703 spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); 1704 spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, 1705 cr, "dataset = %llu", ds->ds_object); 1706 1707 if (ds->ds_phys->ds_next_clones_obj != 0) { 1708 uint64_t count; 1709 ASSERT(0 == zap_count(mos, 1710 ds->ds_phys->ds_next_clones_obj, &count) && count == 0); 1711 VERIFY(0 == dmu_object_free(mos, 1712 ds->ds_phys->ds_next_clones_obj, tx)); 1713 } 1714 if (ds->ds_phys->ds_props_obj != 0) 1715 VERIFY(0 == zap_destroy(mos, ds->ds_phys->ds_props_obj, tx)); 1716 dsl_dir_close(ds->ds_dir, ds); 1717 ds->ds_dir = NULL; 1718 dsl_dataset_drain_refs(ds, tag); 1719 VERIFY(0 == dmu_object_free(mos, obj, tx)); 1720 } 1721 1722 static int 1723 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1724 { 1725 uint64_t asize; 1726 1727 if (!dmu_tx_is_syncing(tx)) 1728 return (0); 1729 1730 /* 1731 * If there's an fs-only reservation, any blocks that might become 1732 * owned by the snapshot dataset must be accommodated by space 1733 * outside of the reservation. 1734 */ 1735 asize = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1736 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, FALSE)) 1737 return (ENOSPC); 1738 1739 /* 1740 * Propogate any reserved space for this snapshot to other 1741 * snapshot checks in this sync group. 1742 */ 1743 if (asize > 0) 1744 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1745 1746 return (0); 1747 } 1748 1749 /* ARGSUSED */ 1750 int 1751 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 1752 { 1753 dsl_dataset_t *ds = arg1; 1754 const char *snapname = arg2; 1755 int err; 1756 uint64_t value; 1757 1758 /* 1759 * We don't allow multiple snapshots of the same txg. If there 1760 * is already one, try again. 1761 */ 1762 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 1763 return (EAGAIN); 1764 1765 /* 1766 * Check for conflicting name snapshot name. 1767 */ 1768 err = dsl_dataset_snap_lookup(ds, snapname, &value); 1769 if (err == 0) 1770 return (EEXIST); 1771 if (err != ENOENT) 1772 return (err); 1773 1774 /* 1775 * Check that the dataset's name is not too long. Name consists 1776 * of the dataset's length + 1 for the @-sign + snapshot name's length 1777 */ 1778 if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) 1779 return (ENAMETOOLONG); 1780 1781 err = dsl_dataset_snapshot_reserve_space(ds, tx); 1782 if (err) 1783 return (err); 1784 1785 ds->ds_trysnap_txg = tx->tx_txg; 1786 return (0); 1787 } 1788 1789 void 1790 dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1791 { 1792 dsl_dataset_t *ds = arg1; 1793 const char *snapname = arg2; 1794 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1795 dmu_buf_t *dbuf; 1796 dsl_dataset_phys_t *dsphys; 1797 uint64_t dsobj, crtxg; 1798 objset_t *mos = dp->dp_meta_objset; 1799 int err; 1800 1801 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1802 1803 /* 1804 * The origin's ds_creation_txg has to be < TXG_INITIAL 1805 */ 1806 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1807 crtxg = 1; 1808 else 1809 crtxg = tx->tx_txg; 1810 1811 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1812 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1813 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1814 dmu_buf_will_dirty(dbuf, tx); 1815 dsphys = dbuf->db_data; 1816 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1817 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1818 dsphys->ds_fsid_guid = unique_create(); 1819 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1820 sizeof (dsphys->ds_guid)); 1821 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1822 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1823 dsphys->ds_next_snap_obj = ds->ds_object; 1824 dsphys->ds_num_children = 1; 1825 dsphys->ds_creation_time = gethrestime_sec(); 1826 dsphys->ds_creation_txg = crtxg; 1827 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1828 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; 1829 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1830 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1831 dsphys->ds_flags = ds->ds_phys->ds_flags; 1832 dsphys->ds_bp = ds->ds_phys->ds_bp; 1833 dmu_buf_rele(dbuf, FTAG); 1834 1835 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1836 if (ds->ds_prev) { 1837 uint64_t next_clones_obj = 1838 ds->ds_prev->ds_phys->ds_next_clones_obj; 1839 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1840 ds->ds_object || 1841 ds->ds_prev->ds_phys->ds_num_children > 1); 1842 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1843 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1844 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1845 ds->ds_prev->ds_phys->ds_creation_txg); 1846 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1847 } else if (next_clones_obj != 0) { 1848 VERIFY3U(0, ==, zap_remove_int(mos, 1849 next_clones_obj, dsphys->ds_next_snap_obj, tx)); 1850 VERIFY3U(0, ==, zap_add_int(mos, 1851 next_clones_obj, dsobj, tx)); 1852 } 1853 } 1854 1855 /* 1856 * If we have a reference-reservation on this dataset, we will 1857 * need to increase the amount of refreservation being charged 1858 * since our unique space is going to zero. 1859 */ 1860 if (ds->ds_reserved) { 1861 int64_t add = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1862 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1863 add, 0, 0, tx); 1864 } 1865 1866 bplist_close(&ds->ds_deadlist); 1867 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1868 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1869 ds->ds_phys->ds_prev_snap_obj = dsobj; 1870 ds->ds_phys->ds_prev_snap_txg = crtxg; 1871 ds->ds_phys->ds_unique_bytes = 0; 1872 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1873 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1874 ds->ds_phys->ds_deadlist_obj = 1875 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1876 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1877 ds->ds_phys->ds_deadlist_obj)); 1878 1879 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); 1880 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1881 snapname, 8, 1, &dsobj, tx); 1882 ASSERT(err == 0); 1883 1884 if (ds->ds_prev) 1885 dsl_dataset_drop_ref(ds->ds_prev, ds); 1886 VERIFY(0 == dsl_dataset_get_ref(dp, 1887 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1888 1889 dsl_pool_ds_snapshotted(ds, tx); 1890 1891 spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, 1892 "dataset = %llu", dsobj); 1893 } 1894 1895 void 1896 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1897 { 1898 ASSERT(dmu_tx_is_syncing(tx)); 1899 ASSERT(ds->ds_user_ptr != NULL); 1900 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1901 1902 /* 1903 * in case we had to change ds_fsid_guid when we opened it, 1904 * sync it out now. 1905 */ 1906 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1907 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1908 1909 dsl_dir_dirty(ds->ds_dir, tx); 1910 dmu_objset_sync(ds->ds_user_ptr, zio, tx); 1911 } 1912 1913 void 1914 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1915 { 1916 uint64_t refd, avail, uobjs, aobjs; 1917 1918 dsl_dir_stats(ds->ds_dir, nv); 1919 1920 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1921 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1922 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1923 1924 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1925 ds->ds_phys->ds_creation_time); 1926 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1927 ds->ds_phys->ds_creation_txg); 1928 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1929 ds->ds_quota); 1930 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1931 ds->ds_reserved); 1932 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1933 ds->ds_phys->ds_guid); 1934 1935 if (ds->ds_phys->ds_next_snap_obj) { 1936 /* 1937 * This is a snapshot; override the dd's space used with 1938 * our unique space and compression ratio. 1939 */ 1940 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1941 ds->ds_phys->ds_unique_bytes); 1942 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 1943 ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1944 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1945 ds->ds_phys->ds_compressed_bytes)); 1946 } 1947 } 1948 1949 void 1950 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1951 { 1952 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1953 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1954 stat->dds_guid = ds->ds_phys->ds_guid; 1955 if (ds->ds_phys->ds_next_snap_obj) { 1956 stat->dds_is_snapshot = B_TRUE; 1957 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1958 } else { 1959 stat->dds_is_snapshot = B_FALSE; 1960 stat->dds_num_clones = 0; 1961 } 1962 1963 /* clone origin is really a dsl_dir thing... */ 1964 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); 1965 if (dsl_dir_is_clone(ds->ds_dir)) { 1966 dsl_dataset_t *ods; 1967 1968 VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool, 1969 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1970 dsl_dataset_name(ods, stat->dds_origin); 1971 dsl_dataset_drop_ref(ods, FTAG); 1972 } else { 1973 stat->dds_origin[0] = '\0'; 1974 } 1975 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); 1976 } 1977 1978 uint64_t 1979 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1980 { 1981 return (ds->ds_fsid_guid); 1982 } 1983 1984 void 1985 dsl_dataset_space(dsl_dataset_t *ds, 1986 uint64_t *refdbytesp, uint64_t *availbytesp, 1987 uint64_t *usedobjsp, uint64_t *availobjsp) 1988 { 1989 *refdbytesp = ds->ds_phys->ds_used_bytes; 1990 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1991 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1992 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1993 if (ds->ds_quota != 0) { 1994 /* 1995 * Adjust available bytes according to refquota 1996 */ 1997 if (*refdbytesp < ds->ds_quota) 1998 *availbytesp = MIN(*availbytesp, 1999 ds->ds_quota - *refdbytesp); 2000 else 2001 *availbytesp = 0; 2002 } 2003 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 2004 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 2005 } 2006 2007 boolean_t 2008 dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) 2009 { 2010 dsl_pool_t *dp = ds->ds_dir->dd_pool; 2011 2012 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 2013 dsl_pool_sync_context(dp)); 2014 if (ds->ds_prev == NULL) 2015 return (B_FALSE); 2016 if (ds->ds_phys->ds_bp.blk_birth > 2017 ds->ds_prev->ds_phys->ds_creation_txg) 2018 return (B_TRUE); 2019 return (B_FALSE); 2020 } 2021 2022 /* ARGSUSED */ 2023 static int 2024 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) 2025 { 2026 dsl_dataset_t *ds = arg1; 2027 char *newsnapname = arg2; 2028 dsl_dir_t *dd = ds->ds_dir; 2029 dsl_dataset_t *hds; 2030 uint64_t val; 2031 int err; 2032 2033 err = dsl_dataset_hold_obj(dd->dd_pool, 2034 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds); 2035 if (err) 2036 return (err); 2037 2038 /* new name better not be in use */ 2039 err = dsl_dataset_snap_lookup(hds, newsnapname, &val); 2040 dsl_dataset_rele(hds, FTAG); 2041 2042 if (err == 0) 2043 err = EEXIST; 2044 else if (err == ENOENT) 2045 err = 0; 2046 2047 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 2048 if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) 2049 err = ENAMETOOLONG; 2050 2051 return (err); 2052 } 2053 2054 static void 2055 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, 2056 cred_t *cr, dmu_tx_t *tx) 2057 { 2058 dsl_dataset_t *ds = arg1; 2059 const char *newsnapname = arg2; 2060 dsl_dir_t *dd = ds->ds_dir; 2061 objset_t *mos = dd->dd_pool->dp_meta_objset; 2062 dsl_dataset_t *hds; 2063 int err; 2064 2065 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); 2066 2067 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, 2068 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds)); 2069 2070 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2071 err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx); 2072 ASSERT3U(err, ==, 0); 2073 mutex_enter(&ds->ds_lock); 2074 (void) strcpy(ds->ds_snapname, newsnapname); 2075 mutex_exit(&ds->ds_lock); 2076 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, 2077 ds->ds_snapname, 8, 1, &ds->ds_object, tx); 2078 ASSERT3U(err, ==, 0); 2079 2080 spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, 2081 cr, "dataset = %llu", ds->ds_object); 2082 dsl_dataset_rele(hds, FTAG); 2083 } 2084 2085 struct renamesnaparg { 2086 dsl_sync_task_group_t *dstg; 2087 char failed[MAXPATHLEN]; 2088 char *oldsnap; 2089 char *newsnap; 2090 }; 2091 2092 static int 2093 dsl_snapshot_rename_one(char *name, void *arg) 2094 { 2095 struct renamesnaparg *ra = arg; 2096 dsl_dataset_t *ds = NULL; 2097 char *cp; 2098 int err; 2099 2100 cp = name + strlen(name); 2101 *cp = '@'; 2102 (void) strcpy(cp + 1, ra->oldsnap); 2103 2104 /* 2105 * For recursive snapshot renames the parent won't be changing 2106 * so we just pass name for both the to/from argument. 2107 */ 2108 err = zfs_secpolicy_rename_perms(name, name, CRED()); 2109 if (err == ENOENT) { 2110 return (0); 2111 } else if (err) { 2112 (void) strcpy(ra->failed, name); 2113 return (err); 2114 } 2115 2116 #ifdef _KERNEL 2117 /* 2118 * For all filesystems undergoing rename, we'll need to unmount it. 2119 */ 2120 (void) zfs_unmount_snap(name, NULL); 2121 #endif 2122 err = dsl_dataset_hold(name, ra->dstg, &ds); 2123 *cp = '\0'; 2124 if (err == ENOENT) { 2125 return (0); 2126 } else if (err) { 2127 (void) strcpy(ra->failed, name); 2128 return (err); 2129 } 2130 2131 dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, 2132 dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); 2133 2134 return (0); 2135 } 2136 2137 static int 2138 dsl_recursive_rename(char *oldname, const char *newname) 2139 { 2140 int err; 2141 struct renamesnaparg *ra; 2142 dsl_sync_task_t *dst; 2143 spa_t *spa; 2144 char *cp, *fsname = spa_strdup(oldname); 2145 int len = strlen(oldname); 2146 2147 /* truncate the snapshot name to get the fsname */ 2148 cp = strchr(fsname, '@'); 2149 *cp = '\0'; 2150 2151 err = spa_open(fsname, &spa, FTAG); 2152 if (err) { 2153 kmem_free(fsname, len + 1); 2154 return (err); 2155 } 2156 ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP); 2157 ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 2158 2159 ra->oldsnap = strchr(oldname, '@') + 1; 2160 ra->newsnap = strchr(newname, '@') + 1; 2161 *ra->failed = '\0'; 2162 2163 err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, 2164 DS_FIND_CHILDREN); 2165 kmem_free(fsname, len + 1); 2166 2167 if (err == 0) { 2168 err = dsl_sync_task_group_wait(ra->dstg); 2169 } 2170 2171 for (dst = list_head(&ra->dstg->dstg_tasks); dst; 2172 dst = list_next(&ra->dstg->dstg_tasks, dst)) { 2173 dsl_dataset_t *ds = dst->dst_arg1; 2174 if (dst->dst_err) { 2175 dsl_dir_name(ds->ds_dir, ra->failed); 2176 (void) strcat(ra->failed, "@"); 2177 (void) strcat(ra->failed, ra->newsnap); 2178 } 2179 dsl_dataset_rele(ds, ra->dstg); 2180 } 2181 2182 if (err) 2183 (void) strcpy(oldname, ra->failed); 2184 2185 dsl_sync_task_group_destroy(ra->dstg); 2186 kmem_free(ra, sizeof (struct renamesnaparg)); 2187 spa_close(spa, FTAG); 2188 return (err); 2189 } 2190 2191 static int 2192 dsl_valid_rename(char *oldname, void *arg) 2193 { 2194 int delta = *(int *)arg; 2195 2196 if (strlen(oldname) + delta >= MAXNAMELEN) 2197 return (ENAMETOOLONG); 2198 2199 return (0); 2200 } 2201 2202 #pragma weak dmu_objset_rename = dsl_dataset_rename 2203 int 2204 dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive) 2205 { 2206 dsl_dir_t *dd; 2207 dsl_dataset_t *ds; 2208 const char *tail; 2209 int err; 2210 2211 err = dsl_dir_open(oldname, FTAG, &dd, &tail); 2212 if (err) 2213 return (err); 2214 /* 2215 * If there are more than 2 references there may be holds 2216 * hanging around that haven't been cleared out yet. 2217 */ 2218 if (dmu_buf_refcount(dd->dd_dbuf) > 2) 2219 txg_wait_synced(dd->dd_pool, 0); 2220 if (tail == NULL) { 2221 int delta = strlen(newname) - strlen(oldname); 2222 2223 /* if we're growing, validate child name lengths */ 2224 if (delta > 0) 2225 err = dmu_objset_find(oldname, dsl_valid_rename, 2226 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); 2227 2228 if (!err) 2229 err = dsl_dir_rename(dd, newname); 2230 dsl_dir_close(dd, FTAG); 2231 return (err); 2232 } 2233 if (tail[0] != '@') { 2234 /* the name ended in a nonexistant component */ 2235 dsl_dir_close(dd, FTAG); 2236 return (ENOENT); 2237 } 2238 2239 dsl_dir_close(dd, FTAG); 2240 2241 /* new name must be snapshot in same filesystem */ 2242 tail = strchr(newname, '@'); 2243 if (tail == NULL) 2244 return (EINVAL); 2245 tail++; 2246 if (strncmp(oldname, newname, tail - newname) != 0) 2247 return (EXDEV); 2248 2249 if (recursive) { 2250 err = dsl_recursive_rename(oldname, newname); 2251 } else { 2252 err = dsl_dataset_hold(oldname, FTAG, &ds); 2253 if (err) 2254 return (err); 2255 2256 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2257 dsl_dataset_snapshot_rename_check, 2258 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); 2259 2260 dsl_dataset_rele(ds, FTAG); 2261 } 2262 2263 return (err); 2264 } 2265 2266 struct promotenode { 2267 list_node_t link; 2268 dsl_dataset_t *ds; 2269 }; 2270 2271 struct promotearg { 2272 list_t shared_snaps, origin_snaps, clone_snaps; 2273 dsl_dataset_t *origin_origin, *origin_head; 2274 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2275 }; 2276 2277 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2278 2279 /* ARGSUSED */ 2280 static int 2281 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) 2282 { 2283 dsl_dataset_t *hds = arg1; 2284 struct promotearg *pa = arg2; 2285 struct promotenode *snap = list_head(&pa->shared_snaps); 2286 dsl_dataset_t *origin_ds = snap->ds; 2287 int err; 2288 2289 /* Check that it is a real clone */ 2290 if (!dsl_dir_is_clone(hds->ds_dir)) 2291 return (EINVAL); 2292 2293 /* Since this is so expensive, don't do the preliminary check */ 2294 if (!dmu_tx_is_syncing(tx)) 2295 return (0); 2296 2297 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) 2298 return (EXDEV); 2299 2300 /* compute origin's new unique space */ 2301 snap = list_tail(&pa->clone_snaps); 2302 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2303 err = bplist_space_birthrange(&snap->ds->ds_deadlist, 2304 origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, &pa->unique); 2305 if (err) 2306 return (err); 2307 2308 /* 2309 * Walk the snapshots that we are moving 2310 * 2311 * Compute space to transfer. Consider the incremental changes 2312 * to used for each snapshot: 2313 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2314 * So each snapshot gave birth to: 2315 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2316 * So a sequence would look like: 2317 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2318 * Which simplifies to: 2319 * uN + kN + kN-1 + ... + k1 + k0 2320 * Note however, if we stop before we reach the ORIGIN we get: 2321 * uN + kN + kN-1 + ... + kM - uM-1 2322 */ 2323 pa->used = origin_ds->ds_phys->ds_used_bytes; 2324 pa->comp = origin_ds->ds_phys->ds_compressed_bytes; 2325 pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 2326 for (snap = list_head(&pa->shared_snaps); snap; 2327 snap = list_next(&pa->shared_snaps, snap)) { 2328 uint64_t val, dlused, dlcomp, dluncomp; 2329 dsl_dataset_t *ds = snap->ds; 2330 2331 /* Check that the snapshot name does not conflict */ 2332 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2333 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2334 if (err == 0) 2335 return (EEXIST); 2336 if (err != ENOENT) 2337 return (err); 2338 2339 /* The very first snapshot does not have a deadlist */ 2340 if (ds->ds_phys->ds_prev_snap_obj == 0) 2341 continue; 2342 2343 if (err = bplist_space(&ds->ds_deadlist, 2344 &dlused, &dlcomp, &dluncomp)) 2345 return (err); 2346 pa->used += dlused; 2347 pa->comp += dlcomp; 2348 pa->uncomp += dluncomp; 2349 } 2350 2351 /* 2352 * If we are a clone of a clone then we never reached ORIGIN, 2353 * so we need to subtract out the clone origin's used space. 2354 */ 2355 if (pa->origin_origin) { 2356 pa->used -= pa->origin_origin->ds_phys->ds_used_bytes; 2357 pa->comp -= pa->origin_origin->ds_phys->ds_compressed_bytes; 2358 pa->uncomp -= pa->origin_origin->ds_phys->ds_uncompressed_bytes; 2359 } 2360 2361 /* Check that there is enough space here */ 2362 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2363 pa->used); 2364 if (err) 2365 return (err); 2366 2367 /* 2368 * Compute the amounts of space that will be used by snapshots 2369 * after the promotion (for both origin and clone). For each, 2370 * it is the amount of space that will be on all of their 2371 * deadlists (that was not born before their new origin). 2372 */ 2373 if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2374 uint64_t space; 2375 2376 /* 2377 * Note, typically this will not be a clone of a clone, 2378 * so snap->ds->ds_origin_txg will be < TXG_INITIAL, so 2379 * these snaplist_space() -> bplist_space_birthrange() 2380 * calls will be fast because they do not have to 2381 * iterate over all bps. 2382 */ 2383 snap = list_head(&pa->origin_snaps); 2384 err = snaplist_space(&pa->shared_snaps, 2385 snap->ds->ds_origin_txg, &pa->cloneusedsnap); 2386 if (err) 2387 return (err); 2388 2389 err = snaplist_space(&pa->clone_snaps, 2390 snap->ds->ds_origin_txg, &space); 2391 if (err) 2392 return (err); 2393 pa->cloneusedsnap += space; 2394 } 2395 if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2396 err = snaplist_space(&pa->origin_snaps, 2397 origin_ds->ds_phys->ds_creation_txg, &pa->originusedsnap); 2398 if (err) 2399 return (err); 2400 } 2401 2402 return (0); 2403 } 2404 2405 static void 2406 dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2407 { 2408 dsl_dataset_t *hds = arg1; 2409 struct promotearg *pa = arg2; 2410 struct promotenode *snap = list_head(&pa->shared_snaps); 2411 dsl_dataset_t *origin_ds = snap->ds; 2412 dsl_dataset_t *origin_head; 2413 dsl_dir_t *dd = hds->ds_dir; 2414 dsl_pool_t *dp = hds->ds_dir->dd_pool; 2415 dsl_dir_t *odd = NULL; 2416 uint64_t oldnext_obj; 2417 int64_t delta; 2418 2419 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); 2420 2421 snap = list_head(&pa->origin_snaps); 2422 origin_head = snap->ds; 2423 2424 /* 2425 * We need to explicitly open odd, since origin_ds's dd will be 2426 * changing. 2427 */ 2428 VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object, 2429 NULL, FTAG, &odd)); 2430 2431 /* change origin's next snap */ 2432 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2433 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; 2434 snap = list_tail(&pa->clone_snaps); 2435 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2436 origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; 2437 2438 /* change the origin's next clone */ 2439 if (origin_ds->ds_phys->ds_next_clones_obj) { 2440 VERIFY3U(0, ==, zap_remove_int(dp->dp_meta_objset, 2441 origin_ds->ds_phys->ds_next_clones_obj, 2442 origin_ds->ds_phys->ds_next_snap_obj, tx)); 2443 VERIFY3U(0, ==, zap_add_int(dp->dp_meta_objset, 2444 origin_ds->ds_phys->ds_next_clones_obj, 2445 oldnext_obj, tx)); 2446 } 2447 2448 /* change origin */ 2449 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2450 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 2451 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 2452 hds->ds_origin_txg = origin_head->ds_origin_txg; 2453 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2454 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 2455 origin_head->ds_origin_txg = origin_ds->ds_phys->ds_creation_txg; 2456 2457 /* move snapshots to this dir */ 2458 for (snap = list_head(&pa->shared_snaps); snap; 2459 snap = list_next(&pa->shared_snaps, snap)) { 2460 dsl_dataset_t *ds = snap->ds; 2461 2462 /* unregister props as dsl_dir is changing */ 2463 if (ds->ds_user_ptr) { 2464 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 2465 ds->ds_user_ptr = NULL; 2466 } 2467 /* move snap name entry */ 2468 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2469 VERIFY(0 == dsl_dataset_snap_remove(origin_head, 2470 ds->ds_snapname, tx)); 2471 VERIFY(0 == zap_add(dp->dp_meta_objset, 2472 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2473 8, 1, &ds->ds_object, tx)); 2474 /* change containing dsl_dir */ 2475 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2476 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2477 ds->ds_phys->ds_dir_obj = dd->dd_object; 2478 ASSERT3P(ds->ds_dir, ==, odd); 2479 dsl_dir_close(ds->ds_dir, ds); 2480 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, 2481 NULL, ds, &ds->ds_dir)); 2482 2483 ASSERT3U(dsl_prop_numcb(ds), ==, 0); 2484 } 2485 2486 /* 2487 * Change space accounting. 2488 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2489 * both be valid, or both be 0 (resulting in delta == 0). This 2490 * is true for each of {clone,origin} independently. 2491 */ 2492 2493 delta = pa->cloneusedsnap - 2494 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2495 ASSERT3S(delta, >=, 0); 2496 ASSERT3U(pa->used, >=, delta); 2497 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2498 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2499 pa->used - delta, pa->comp, pa->uncomp, tx); 2500 2501 delta = pa->originusedsnap - 2502 odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2503 ASSERT3S(delta, <=, 0); 2504 ASSERT3U(pa->used, >=, -delta); 2505 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2506 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2507 -pa->used - delta, -pa->comp, -pa->uncomp, tx); 2508 2509 origin_ds->ds_phys->ds_unique_bytes = pa->unique; 2510 2511 /* log history record */ 2512 spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, 2513 cr, "dataset = %llu", hds->ds_object); 2514 2515 dsl_dir_close(odd, FTAG); 2516 } 2517 2518 static char *snaplist_tag = "snaplist"; 2519 /* 2520 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2521 * (exclusive) and last_obj (inclusive). The list will be in reverse 2522 * order (last_obj will be the list_head()). If first_obj == 0, do all 2523 * snapshots back to this dataset's origin. 2524 */ 2525 static int 2526 snaplist_make(dsl_pool_t *dp, boolean_t own, 2527 uint64_t first_obj, uint64_t last_obj, list_t *l) 2528 { 2529 uint64_t obj = last_obj; 2530 2531 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock)); 2532 2533 list_create(l, sizeof (struct promotenode), 2534 offsetof(struct promotenode, link)); 2535 2536 while (obj != first_obj) { 2537 dsl_dataset_t *ds; 2538 struct promotenode *snap; 2539 int err; 2540 2541 if (own) { 2542 err = dsl_dataset_own_obj(dp, obj, 2543 0, snaplist_tag, &ds); 2544 if (err == 0) 2545 dsl_dataset_make_exclusive(ds, snaplist_tag); 2546 } else { 2547 err = dsl_dataset_hold_obj(dp, obj, snaplist_tag, &ds); 2548 } 2549 if (err == ENOENT) { 2550 /* lost race with snapshot destroy */ 2551 struct promotenode *last = list_tail(l); 2552 ASSERT(obj != last->ds->ds_phys->ds_prev_snap_obj); 2553 obj = last->ds->ds_phys->ds_prev_snap_obj; 2554 continue; 2555 } else if (err) { 2556 return (err); 2557 } 2558 2559 if (first_obj == 0) 2560 first_obj = ds->ds_dir->dd_phys->dd_origin_obj; 2561 2562 snap = kmem_alloc(sizeof (struct promotenode), KM_SLEEP); 2563 snap->ds = ds; 2564 list_insert_tail(l, snap); 2565 obj = ds->ds_phys->ds_prev_snap_obj; 2566 } 2567 2568 return (0); 2569 } 2570 2571 static int 2572 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2573 { 2574 struct promotenode *snap; 2575 2576 *spacep = 0; 2577 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2578 uint64_t used; 2579 int err = bplist_space_birthrange(&snap->ds->ds_deadlist, 2580 mintxg, UINT64_MAX, &used); 2581 if (err) 2582 return (err); 2583 *spacep += used; 2584 } 2585 return (0); 2586 } 2587 2588 static void 2589 snaplist_destroy(list_t *l, boolean_t own) 2590 { 2591 struct promotenode *snap; 2592 2593 if (!list_link_active(&l->list_head)) 2594 return; 2595 2596 while ((snap = list_tail(l)) != NULL) { 2597 list_remove(l, snap); 2598 if (own) 2599 dsl_dataset_disown(snap->ds, snaplist_tag); 2600 else 2601 dsl_dataset_rele(snap->ds, snaplist_tag); 2602 kmem_free(snap, sizeof (struct promotenode)); 2603 } 2604 list_destroy(l); 2605 } 2606 2607 /* 2608 * Promote a clone. Nomenclature note: 2609 * "clone" or "cds": the original clone which is being promoted 2610 * "origin" or "ods": the snapshot which is originally clone's origin 2611 * "origin head" or "ohds": the dataset which is the head 2612 * (filesystem/volume) for the origin 2613 * "origin origin": the origin of the origin's filesystem (typically 2614 * NULL, indicating that the clone is not a clone of a clone). 2615 */ 2616 int 2617 dsl_dataset_promote(const char *name) 2618 { 2619 dsl_dataset_t *ds; 2620 dsl_dir_t *dd; 2621 dsl_pool_t *dp; 2622 dmu_object_info_t doi; 2623 struct promotearg pa = { 0 }; 2624 struct promotenode *snap; 2625 int err; 2626 2627 err = dsl_dataset_hold(name, FTAG, &ds); 2628 if (err) 2629 return (err); 2630 dd = ds->ds_dir; 2631 dp = dd->dd_pool; 2632 2633 err = dmu_object_info(dp->dp_meta_objset, 2634 ds->ds_phys->ds_snapnames_zapobj, &doi); 2635 if (err) { 2636 dsl_dataset_rele(ds, FTAG); 2637 return (err); 2638 } 2639 2640 if (dsl_dataset_is_snapshot(ds) || dd->dd_phys->dd_origin_obj == 0) { 2641 dsl_dataset_rele(ds, FTAG); 2642 return (EINVAL); 2643 } 2644 2645 /* 2646 * We are going to inherit all the snapshots taken before our 2647 * origin (i.e., our new origin will be our parent's origin). 2648 * Take ownership of them so that we can rename them into our 2649 * namespace. 2650 */ 2651 rw_enter(&dp->dp_config_rwlock, RW_READER); 2652 2653 err = snaplist_make(dp, B_TRUE, 0, dd->dd_phys->dd_origin_obj, 2654 &pa.shared_snaps); 2655 if (err != 0) 2656 goto out; 2657 2658 err = snaplist_make(dp, B_FALSE, 0, ds->ds_object, &pa.clone_snaps); 2659 if (err != 0) 2660 goto out; 2661 2662 snap = list_head(&pa.shared_snaps); 2663 ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); 2664 err = snaplist_make(dp, B_FALSE, dd->dd_phys->dd_origin_obj, 2665 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, &pa.origin_snaps); 2666 if (err != 0) 2667 goto out; 2668 2669 if (dsl_dir_is_clone(snap->ds->ds_dir)) { 2670 err = dsl_dataset_own_obj(dp, 2671 snap->ds->ds_dir->dd_phys->dd_origin_obj, 2672 0, FTAG, &pa.origin_origin); 2673 if (err != 0) 2674 goto out; 2675 } 2676 2677 out: 2678 rw_exit(&dp->dp_config_rwlock); 2679 2680 /* 2681 * Add in 128x the snapnames zapobj size, since we will be moving 2682 * a bunch of snapnames to the promoted ds, and dirtying their 2683 * bonus buffers. 2684 */ 2685 if (err == 0) { 2686 err = dsl_sync_task_do(dp, dsl_dataset_promote_check, 2687 dsl_dataset_promote_sync, ds, &pa, 2688 2 + 2 * doi.doi_physical_blks); 2689 } 2690 2691 snaplist_destroy(&pa.shared_snaps, B_TRUE); 2692 snaplist_destroy(&pa.clone_snaps, B_FALSE); 2693 snaplist_destroy(&pa.origin_snaps, B_FALSE); 2694 if (pa.origin_origin) 2695 dsl_dataset_disown(pa.origin_origin, FTAG); 2696 dsl_dataset_rele(ds, FTAG); 2697 return (err); 2698 } 2699 2700 struct cloneswaparg { 2701 dsl_dataset_t *cds; /* clone dataset */ 2702 dsl_dataset_t *ohds; /* origin's head dataset */ 2703 boolean_t force; 2704 int64_t unused_refres_delta; /* change in unconsumed refreservation */ 2705 }; 2706 2707 /* ARGSUSED */ 2708 static int 2709 dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx) 2710 { 2711 struct cloneswaparg *csa = arg1; 2712 2713 /* they should both be heads */ 2714 if (dsl_dataset_is_snapshot(csa->cds) || 2715 dsl_dataset_is_snapshot(csa->ohds)) 2716 return (EINVAL); 2717 2718 /* the branch point should be just before them */ 2719 if (csa->cds->ds_prev != csa->ohds->ds_prev) 2720 return (EINVAL); 2721 2722 /* cds should be the clone */ 2723 if (csa->cds->ds_prev->ds_phys->ds_next_snap_obj != 2724 csa->ohds->ds_object) 2725 return (EINVAL); 2726 2727 /* the clone should be a child of the origin */ 2728 if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir) 2729 return (EINVAL); 2730 2731 /* ohds shouldn't be modified unless 'force' */ 2732 if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds)) 2733 return (ETXTBSY); 2734 2735 /* adjust amount of any unconsumed refreservation */ 2736 csa->unused_refres_delta = 2737 (int64_t)MIN(csa->ohds->ds_reserved, 2738 csa->ohds->ds_phys->ds_unique_bytes) - 2739 (int64_t)MIN(csa->ohds->ds_reserved, 2740 csa->cds->ds_phys->ds_unique_bytes); 2741 2742 if (csa->unused_refres_delta > 0 && 2743 csa->unused_refres_delta > 2744 dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE)) 2745 return (ENOSPC); 2746 2747 return (0); 2748 } 2749 2750 /* ARGSUSED */ 2751 static void 2752 dsl_dataset_clone_swap_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2753 { 2754 struct cloneswaparg *csa = arg1; 2755 dsl_pool_t *dp = csa->cds->ds_dir->dd_pool; 2756 2757 ASSERT(csa->cds->ds_reserved == 0); 2758 ASSERT(csa->cds->ds_quota == csa->ohds->ds_quota); 2759 2760 dmu_buf_will_dirty(csa->cds->ds_dbuf, tx); 2761 dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx); 2762 dmu_buf_will_dirty(csa->cds->ds_prev->ds_dbuf, tx); 2763 2764 if (csa->cds->ds_user_ptr != NULL) { 2765 csa->cds->ds_user_evict_func(csa->cds, csa->cds->ds_user_ptr); 2766 csa->cds->ds_user_ptr = NULL; 2767 } 2768 2769 if (csa->ohds->ds_user_ptr != NULL) { 2770 csa->ohds->ds_user_evict_func(csa->ohds, 2771 csa->ohds->ds_user_ptr); 2772 csa->ohds->ds_user_ptr = NULL; 2773 } 2774 2775 /* reset origin's unique bytes */ 2776 VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, 2777 csa->cds->ds_prev->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2778 &csa->cds->ds_prev->ds_phys->ds_unique_bytes)); 2779 2780 /* swap blkptrs */ 2781 { 2782 blkptr_t tmp; 2783 tmp = csa->ohds->ds_phys->ds_bp; 2784 csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp; 2785 csa->cds->ds_phys->ds_bp = tmp; 2786 } 2787 2788 /* set dd_*_bytes */ 2789 { 2790 int64_t dused, dcomp, duncomp; 2791 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2792 uint64_t odl_used, odl_comp, odl_uncomp; 2793 2794 ASSERT3U(csa->cds->ds_dir->dd_phys-> 2795 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2796 2797 VERIFY(0 == bplist_space(&csa->cds->ds_deadlist, &cdl_used, 2798 &cdl_comp, &cdl_uncomp)); 2799 VERIFY(0 == bplist_space(&csa->ohds->ds_deadlist, &odl_used, 2800 &odl_comp, &odl_uncomp)); 2801 2802 dused = csa->cds->ds_phys->ds_used_bytes + cdl_used - 2803 (csa->ohds->ds_phys->ds_used_bytes + odl_used); 2804 dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp - 2805 (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp); 2806 duncomp = csa->cds->ds_phys->ds_uncompressed_bytes + 2807 cdl_uncomp - 2808 (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2809 2810 dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_HEAD, 2811 dused, dcomp, duncomp, tx); 2812 dsl_dir_diduse_space(csa->cds->ds_dir, DD_USED_HEAD, 2813 -dused, -dcomp, -duncomp, tx); 2814 2815 /* 2816 * The difference in the space used by snapshots is the 2817 * difference in snapshot space due to the head's 2818 * deadlist (since that's the only thing that's 2819 * changing that affects the snapused). 2820 */ 2821 VERIFY(0 == bplist_space_birthrange(&csa->cds->ds_deadlist, 2822 csa->ohds->ds_origin_txg, UINT64_MAX, &cdl_used)); 2823 VERIFY(0 == bplist_space_birthrange(&csa->ohds->ds_deadlist, 2824 csa->ohds->ds_origin_txg, UINT64_MAX, &odl_used)); 2825 dsl_dir_transfer_space(csa->ohds->ds_dir, cdl_used - odl_used, 2826 DD_USED_HEAD, DD_USED_SNAP, tx); 2827 } 2828 2829 #define SWITCH64(x, y) \ 2830 { \ 2831 uint64_t __tmp = (x); \ 2832 (x) = (y); \ 2833 (y) = __tmp; \ 2834 } 2835 2836 /* swap ds_*_bytes */ 2837 SWITCH64(csa->ohds->ds_phys->ds_used_bytes, 2838 csa->cds->ds_phys->ds_used_bytes); 2839 SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes, 2840 csa->cds->ds_phys->ds_compressed_bytes); 2841 SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes, 2842 csa->cds->ds_phys->ds_uncompressed_bytes); 2843 SWITCH64(csa->ohds->ds_phys->ds_unique_bytes, 2844 csa->cds->ds_phys->ds_unique_bytes); 2845 2846 /* apply any parent delta for change in unconsumed refreservation */ 2847 dsl_dir_diduse_space(csa->ohds->ds_dir, DD_USED_REFRSRV, 2848 csa->unused_refres_delta, 0, 0, tx); 2849 2850 /* swap deadlists */ 2851 bplist_close(&csa->cds->ds_deadlist); 2852 bplist_close(&csa->ohds->ds_deadlist); 2853 SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj, 2854 csa->cds->ds_phys->ds_deadlist_obj); 2855 VERIFY(0 == bplist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset, 2856 csa->cds->ds_phys->ds_deadlist_obj)); 2857 VERIFY(0 == bplist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset, 2858 csa->ohds->ds_phys->ds_deadlist_obj)); 2859 2860 dsl_pool_ds_clone_swapped(csa->ohds, csa->cds, tx); 2861 } 2862 2863 /* 2864 * Swap 'clone' with its origin head file system. Used at the end 2865 * of "online recv" to swizzle the file system to the new version. 2866 */ 2867 int 2868 dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, 2869 boolean_t force) 2870 { 2871 struct cloneswaparg csa; 2872 int error; 2873 2874 ASSERT(clone->ds_owner); 2875 ASSERT(origin_head->ds_owner); 2876 retry: 2877 /* Need exclusive access for the swap */ 2878 rw_enter(&clone->ds_rwlock, RW_WRITER); 2879 if (!rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) { 2880 rw_exit(&clone->ds_rwlock); 2881 rw_enter(&origin_head->ds_rwlock, RW_WRITER); 2882 if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) { 2883 rw_exit(&origin_head->ds_rwlock); 2884 goto retry; 2885 } 2886 } 2887 csa.cds = clone; 2888 csa.ohds = origin_head; 2889 csa.force = force; 2890 error = dsl_sync_task_do(clone->ds_dir->dd_pool, 2891 dsl_dataset_clone_swap_check, 2892 dsl_dataset_clone_swap_sync, &csa, NULL, 9); 2893 return (error); 2894 } 2895 2896 /* 2897 * Given a pool name and a dataset object number in that pool, 2898 * return the name of that dataset. 2899 */ 2900 int 2901 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2902 { 2903 spa_t *spa; 2904 dsl_pool_t *dp; 2905 dsl_dataset_t *ds; 2906 int error; 2907 2908 if ((error = spa_open(pname, &spa, FTAG)) != 0) 2909 return (error); 2910 dp = spa_get_dsl(spa); 2911 rw_enter(&dp->dp_config_rwlock, RW_READER); 2912 if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) { 2913 dsl_dataset_name(ds, buf); 2914 dsl_dataset_rele(ds, FTAG); 2915 } 2916 rw_exit(&dp->dp_config_rwlock); 2917 spa_close(spa, FTAG); 2918 2919 return (error); 2920 } 2921 2922 int 2923 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2924 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2925 { 2926 int error = 0; 2927 2928 ASSERT3S(asize, >, 0); 2929 2930 /* 2931 * *ref_rsrv is the portion of asize that will come from any 2932 * unconsumed refreservation space. 2933 */ 2934 *ref_rsrv = 0; 2935 2936 mutex_enter(&ds->ds_lock); 2937 /* 2938 * Make a space adjustment for reserved bytes. 2939 */ 2940 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2941 ASSERT3U(*used, >=, 2942 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2943 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2944 *ref_rsrv = 2945 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2946 } 2947 2948 if (!check_quota || ds->ds_quota == 0) { 2949 mutex_exit(&ds->ds_lock); 2950 return (0); 2951 } 2952 /* 2953 * If they are requesting more space, and our current estimate 2954 * is over quota, they get to try again unless the actual 2955 * on-disk is over quota and there are no pending changes (which 2956 * may free up space for us). 2957 */ 2958 if (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) { 2959 if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota) 2960 error = ERESTART; 2961 else 2962 error = EDQUOT; 2963 } 2964 mutex_exit(&ds->ds_lock); 2965 2966 return (error); 2967 } 2968 2969 /* ARGSUSED */ 2970 static int 2971 dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) 2972 { 2973 dsl_dataset_t *ds = arg1; 2974 uint64_t *quotap = arg2; 2975 uint64_t new_quota = *quotap; 2976 2977 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA) 2978 return (ENOTSUP); 2979 2980 if (new_quota == 0) 2981 return (0); 2982 2983 if (new_quota < ds->ds_phys->ds_used_bytes || 2984 new_quota < ds->ds_reserved) 2985 return (ENOSPC); 2986 2987 return (0); 2988 } 2989 2990 /* ARGSUSED */ 2991 void 2992 dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2993 { 2994 dsl_dataset_t *ds = arg1; 2995 uint64_t *quotap = arg2; 2996 uint64_t new_quota = *quotap; 2997 2998 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2999 3000 ds->ds_quota = new_quota; 3001 3002 dsl_prop_set_uint64_sync(ds->ds_dir, "refquota", new_quota, cr, tx); 3003 3004 spa_history_internal_log(LOG_DS_REFQUOTA, ds->ds_dir->dd_pool->dp_spa, 3005 tx, cr, "%lld dataset = %llu ", 3006 (longlong_t)new_quota, ds->ds_object); 3007 } 3008 3009 int 3010 dsl_dataset_set_quota(const char *dsname, uint64_t quota) 3011 { 3012 dsl_dataset_t *ds; 3013 int err; 3014 3015 err = dsl_dataset_hold(dsname, FTAG, &ds); 3016 if (err) 3017 return (err); 3018 3019 if (quota != ds->ds_quota) { 3020 /* 3021 * If someone removes a file, then tries to set the quota, we 3022 * want to make sure the file freeing takes effect. 3023 */ 3024 txg_wait_open(ds->ds_dir->dd_pool, 0); 3025 3026 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 3027 dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync, 3028 ds, "a, 0); 3029 } 3030 dsl_dataset_rele(ds, FTAG); 3031 return (err); 3032 } 3033 3034 static int 3035 dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) 3036 { 3037 dsl_dataset_t *ds = arg1; 3038 uint64_t *reservationp = arg2; 3039 uint64_t new_reservation = *reservationp; 3040 uint64_t unique; 3041 3042 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < 3043 SPA_VERSION_REFRESERVATION) 3044 return (ENOTSUP); 3045 3046 if (dsl_dataset_is_snapshot(ds)) 3047 return (EINVAL); 3048 3049 /* 3050 * If we are doing the preliminary check in open context, the 3051 * space estimates may be inaccurate. 3052 */ 3053 if (!dmu_tx_is_syncing(tx)) 3054 return (0); 3055 3056 mutex_enter(&ds->ds_lock); 3057 unique = dsl_dataset_unique(ds); 3058 mutex_exit(&ds->ds_lock); 3059 3060 if (MAX(unique, new_reservation) > MAX(unique, ds->ds_reserved)) { 3061 uint64_t delta = MAX(unique, new_reservation) - 3062 MAX(unique, ds->ds_reserved); 3063 3064 if (delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 3065 return (ENOSPC); 3066 if (ds->ds_quota > 0 && 3067 new_reservation > ds->ds_quota) 3068 return (ENOSPC); 3069 } 3070 3071 return (0); 3072 } 3073 3074 /* ARGSUSED */ 3075 static void 3076 dsl_dataset_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, 3077 dmu_tx_t *tx) 3078 { 3079 dsl_dataset_t *ds = arg1; 3080 uint64_t *reservationp = arg2; 3081 uint64_t new_reservation = *reservationp; 3082 uint64_t unique; 3083 int64_t delta; 3084 3085 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3086 3087 mutex_enter(&ds->ds_dir->dd_lock); 3088 mutex_enter(&ds->ds_lock); 3089 unique = dsl_dataset_unique(ds); 3090 delta = MAX(0, (int64_t)(new_reservation - unique)) - 3091 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3092 ds->ds_reserved = new_reservation; 3093 mutex_exit(&ds->ds_lock); 3094 3095 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3096 mutex_exit(&ds->ds_dir->dd_lock); 3097 dsl_prop_set_uint64_sync(ds->ds_dir, "refreservation", 3098 new_reservation, cr, tx); 3099 3100 spa_history_internal_log(LOG_DS_REFRESERV, 3101 ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu", 3102 (longlong_t)new_reservation, ds->ds_object); 3103 } 3104 3105 int 3106 dsl_dataset_set_reservation(const char *dsname, uint64_t reservation) 3107 { 3108 dsl_dataset_t *ds; 3109 int err; 3110 3111 err = dsl_dataset_hold(dsname, FTAG, &ds); 3112 if (err) 3113 return (err); 3114 3115 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 3116 dsl_dataset_set_reservation_check, 3117 dsl_dataset_set_reservation_sync, ds, &reservation, 0); 3118 dsl_dataset_rele(ds, FTAG); 3119 return (err); 3120 } 3121