1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/dmu_objset.h> 29 #include <sys/dsl_dataset.h> 30 #include <sys/dsl_dir.h> 31 #include <sys/dsl_prop.h> 32 #include <sys/dsl_synctask.h> 33 #include <sys/dmu_traverse.h> 34 #include <sys/dmu_tx.h> 35 #include <sys/arc.h> 36 #include <sys/zio.h> 37 #include <sys/zap.h> 38 #include <sys/unique.h> 39 #include <sys/zfs_context.h> 40 #include <sys/zfs_ioctl.h> 41 #include <sys/spa.h> 42 #include <sys/sunddi.h> 43 44 static char *dsl_reaper = "the grim reaper"; 45 46 static dsl_checkfunc_t dsl_dataset_destroy_begin_check; 47 static dsl_syncfunc_t dsl_dataset_destroy_begin_sync; 48 static dsl_checkfunc_t dsl_dataset_rollback_check; 49 static dsl_syncfunc_t dsl_dataset_rollback_sync; 50 static dsl_syncfunc_t dsl_dataset_set_reservation_sync; 51 52 #define DS_REF_MAX (1ULL << 62) 53 54 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 55 56 #define DSL_DATASET_IS_DESTROYED(ds) ((ds)->ds_owner == dsl_reaper) 57 58 static void dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag); 59 60 /* 61 * Figure out how much of this delta should be propogated to the dsl_dir 62 * layer. If there's a refreservation, that space has already been 63 * partially accounted for in our ancestors. 64 */ 65 static int64_t 66 parent_delta(dsl_dataset_t *ds, int64_t delta) 67 { 68 uint64_t old_bytes, new_bytes; 69 70 if (ds->ds_reserved == 0) 71 return (delta); 72 73 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 74 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 75 76 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 77 return (new_bytes - old_bytes); 78 } 79 80 void 81 dsl_dataset_block_born(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 82 { 83 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 84 int compressed = BP_GET_PSIZE(bp); 85 int uncompressed = BP_GET_UCSIZE(bp); 86 int64_t delta; 87 88 dprintf_bp(bp, "born, ds=%p\n", ds); 89 90 ASSERT(dmu_tx_is_syncing(tx)); 91 /* It could have been compressed away to nothing */ 92 if (BP_IS_HOLE(bp)) 93 return; 94 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 95 ASSERT3U(BP_GET_TYPE(bp), <, DMU_OT_NUMTYPES); 96 if (ds == NULL) { 97 /* 98 * Account for the meta-objset space in its placeholder 99 * dsl_dir. 100 */ 101 ASSERT3U(compressed, ==, uncompressed); /* it's all metadata */ 102 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 103 used, compressed, uncompressed, tx); 104 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 105 return; 106 } 107 dmu_buf_will_dirty(ds->ds_dbuf, tx); 108 mutex_enter(&ds->ds_lock); 109 delta = parent_delta(ds, used); 110 ds->ds_phys->ds_used_bytes += used; 111 ds->ds_phys->ds_compressed_bytes += compressed; 112 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 113 ds->ds_phys->ds_unique_bytes += used; 114 mutex_exit(&ds->ds_lock); 115 dsl_dir_diduse_space(ds->ds_dir, delta, compressed, uncompressed, tx); 116 } 117 118 void 119 dsl_dataset_block_kill(dsl_dataset_t *ds, blkptr_t *bp, zio_t *pio, 120 dmu_tx_t *tx) 121 { 122 int used = bp_get_dasize(tx->tx_pool->dp_spa, bp); 123 int compressed = BP_GET_PSIZE(bp); 124 int uncompressed = BP_GET_UCSIZE(bp); 125 126 ASSERT(dmu_tx_is_syncing(tx)); 127 /* No block pointer => nothing to free */ 128 if (BP_IS_HOLE(bp)) 129 return; 130 131 ASSERT(used > 0); 132 if (ds == NULL) { 133 int err; 134 /* 135 * Account for the meta-objset space in its placeholder 136 * dataset. 137 */ 138 err = arc_free(pio, tx->tx_pool->dp_spa, 139 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); 140 ASSERT(err == 0); 141 142 dsl_dir_diduse_space(tx->tx_pool->dp_mos_dir, 143 -used, -compressed, -uncompressed, tx); 144 dsl_dir_dirty(tx->tx_pool->dp_mos_dir, tx); 145 return; 146 } 147 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 148 149 dmu_buf_will_dirty(ds->ds_dbuf, tx); 150 151 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 152 int err; 153 int64_t delta; 154 155 dprintf_bp(bp, "freeing: %s", ""); 156 err = arc_free(pio, tx->tx_pool->dp_spa, 157 tx->tx_txg, bp, NULL, NULL, pio ? ARC_NOWAIT: ARC_WAIT); 158 ASSERT(err == 0); 159 160 mutex_enter(&ds->ds_lock); 161 ASSERT(ds->ds_phys->ds_unique_bytes >= used || 162 !DS_UNIQUE_IS_ACCURATE(ds)); 163 delta = parent_delta(ds, -used); 164 ds->ds_phys->ds_unique_bytes -= used; 165 mutex_exit(&ds->ds_lock); 166 dsl_dir_diduse_space(ds->ds_dir, 167 delta, -compressed, -uncompressed, tx); 168 } else { 169 dprintf_bp(bp, "putting on dead list: %s", ""); 170 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, bp, tx)); 171 ASSERT3U(ds->ds_prev->ds_object, ==, 172 ds->ds_phys->ds_prev_snap_obj); 173 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 174 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 175 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 176 ds->ds_object && bp->blk_birth > 177 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 178 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 179 mutex_enter(&ds->ds_prev->ds_lock); 180 ds->ds_prev->ds_phys->ds_unique_bytes += used; 181 mutex_exit(&ds->ds_prev->ds_lock); 182 } 183 } 184 mutex_enter(&ds->ds_lock); 185 ASSERT3U(ds->ds_phys->ds_used_bytes, >=, used); 186 ds->ds_phys->ds_used_bytes -= used; 187 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 188 ds->ds_phys->ds_compressed_bytes -= compressed; 189 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 190 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 191 mutex_exit(&ds->ds_lock); 192 } 193 194 uint64_t 195 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 196 { 197 uint64_t trysnap = 0; 198 199 if (ds == NULL) 200 return (0); 201 /* 202 * The snapshot creation could fail, but that would cause an 203 * incorrect FALSE return, which would only result in an 204 * overestimation of the amount of space that an operation would 205 * consume, which is OK. 206 * 207 * There's also a small window where we could miss a pending 208 * snapshot, because we could set the sync task in the quiescing 209 * phase. So this should only be used as a guess. 210 */ 211 if (ds->ds_trysnap_txg > 212 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 213 trysnap = ds->ds_trysnap_txg; 214 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 215 } 216 217 int 218 dsl_dataset_block_freeable(dsl_dataset_t *ds, uint64_t blk_birth) 219 { 220 return (blk_birth > dsl_dataset_prev_snap_txg(ds)); 221 } 222 223 /* ARGSUSED */ 224 static void 225 dsl_dataset_evict(dmu_buf_t *db, void *dsv) 226 { 227 dsl_dataset_t *ds = dsv; 228 229 ASSERT(ds->ds_owner == NULL || DSL_DATASET_IS_DESTROYED(ds)); 230 231 dprintf_ds(ds, "evicting %s\n", ""); 232 233 unique_remove(ds->ds_fsid_guid); 234 235 if (ds->ds_user_ptr != NULL) 236 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 237 238 if (ds->ds_prev) { 239 dsl_dataset_drop_ref(ds->ds_prev, ds); 240 ds->ds_prev = NULL; 241 } 242 243 bplist_close(&ds->ds_deadlist); 244 if (ds->ds_dir) 245 dsl_dir_close(ds->ds_dir, ds); 246 247 ASSERT(!list_link_active(&ds->ds_synced_link)); 248 249 mutex_destroy(&ds->ds_lock); 250 mutex_destroy(&ds->ds_opening_lock); 251 mutex_destroy(&ds->ds_deadlist.bpl_lock); 252 rw_destroy(&ds->ds_rwlock); 253 cv_destroy(&ds->ds_exclusive_cv); 254 255 kmem_free(ds, sizeof (dsl_dataset_t)); 256 } 257 258 static int 259 dsl_dataset_get_snapname(dsl_dataset_t *ds) 260 { 261 dsl_dataset_phys_t *headphys; 262 int err; 263 dmu_buf_t *headdbuf; 264 dsl_pool_t *dp = ds->ds_dir->dd_pool; 265 objset_t *mos = dp->dp_meta_objset; 266 267 if (ds->ds_snapname[0]) 268 return (0); 269 if (ds->ds_phys->ds_next_snap_obj == 0) 270 return (0); 271 272 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 273 FTAG, &headdbuf); 274 if (err) 275 return (err); 276 headphys = headdbuf->db_data; 277 err = zap_value_search(dp->dp_meta_objset, 278 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 279 dmu_buf_rele(headdbuf, FTAG); 280 return (err); 281 } 282 283 static int 284 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 285 { 286 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 287 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 288 matchtype_t mt; 289 int err; 290 291 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 292 mt = MT_FIRST; 293 else 294 mt = MT_EXACT; 295 296 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 297 value, mt, NULL, 0, NULL); 298 if (err == ENOTSUP && mt == MT_FIRST) 299 err = zap_lookup(mos, snapobj, name, 8, 1, value); 300 return (err); 301 } 302 303 static int 304 dsl_dataset_snap_remove(dsl_dataset_t *ds, char *name, dmu_tx_t *tx) 305 { 306 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 307 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 308 matchtype_t mt; 309 int err; 310 311 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 312 mt = MT_FIRST; 313 else 314 mt = MT_EXACT; 315 316 err = zap_remove_norm(mos, snapobj, name, mt, tx); 317 if (err == ENOTSUP && mt == MT_FIRST) 318 err = zap_remove(mos, snapobj, name, tx); 319 return (err); 320 } 321 322 static int 323 dsl_dataset_get_ref(dsl_pool_t *dp, uint64_t dsobj, void *tag, 324 dsl_dataset_t **dsp) 325 { 326 objset_t *mos = dp->dp_meta_objset; 327 dmu_buf_t *dbuf; 328 dsl_dataset_t *ds; 329 int err; 330 331 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 332 dsl_pool_sync_context(dp)); 333 334 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 335 if (err) 336 return (err); 337 ds = dmu_buf_get_user(dbuf); 338 if (ds == NULL) { 339 dsl_dataset_t *winner; 340 341 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 342 ds->ds_dbuf = dbuf; 343 ds->ds_object = dsobj; 344 ds->ds_phys = dbuf->db_data; 345 346 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 347 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 348 mutex_init(&ds->ds_deadlist.bpl_lock, NULL, MUTEX_DEFAULT, 349 NULL); 350 rw_init(&ds->ds_rwlock, 0, 0, 0); 351 cv_init(&ds->ds_exclusive_cv, NULL, CV_DEFAULT, NULL); 352 353 err = bplist_open(&ds->ds_deadlist, 354 mos, ds->ds_phys->ds_deadlist_obj); 355 if (err == 0) { 356 err = dsl_dir_open_obj(dp, 357 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 358 } 359 if (err) { 360 /* 361 * we don't really need to close the blist if we 362 * just opened it. 363 */ 364 mutex_destroy(&ds->ds_lock); 365 mutex_destroy(&ds->ds_opening_lock); 366 mutex_destroy(&ds->ds_deadlist.bpl_lock); 367 rw_destroy(&ds->ds_rwlock); 368 cv_destroy(&ds->ds_exclusive_cv); 369 kmem_free(ds, sizeof (dsl_dataset_t)); 370 dmu_buf_rele(dbuf, tag); 371 return (err); 372 } 373 374 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == dsobj) { 375 ds->ds_snapname[0] = '\0'; 376 if (ds->ds_phys->ds_prev_snap_obj) { 377 err = dsl_dataset_get_ref(dp, 378 ds->ds_phys->ds_prev_snap_obj, 379 ds, &ds->ds_prev); 380 } 381 } else if (zfs_flags & ZFS_DEBUG_SNAPNAMES) { 382 err = dsl_dataset_get_snapname(ds); 383 } 384 385 if (!dsl_dataset_is_snapshot(ds)) { 386 /* 387 * In sync context, we're called with either no lock 388 * or with the write lock. If we're not syncing, 389 * we're always called with the read lock held. 390 */ 391 boolean_t need_lock = 392 !RW_WRITE_HELD(&dp->dp_config_rwlock) && 393 dsl_pool_sync_context(dp); 394 395 if (need_lock) 396 rw_enter(&dp->dp_config_rwlock, RW_READER); 397 398 err = dsl_prop_get_ds_locked(ds->ds_dir, 399 "refreservation", sizeof (uint64_t), 1, 400 &ds->ds_reserved, NULL); 401 if (err == 0) { 402 err = dsl_prop_get_ds_locked(ds->ds_dir, 403 "refquota", sizeof (uint64_t), 1, 404 &ds->ds_quota, NULL); 405 } 406 407 if (need_lock) 408 rw_exit(&dp->dp_config_rwlock); 409 } else { 410 ds->ds_reserved = ds->ds_quota = 0; 411 } 412 413 if (err == 0) { 414 winner = dmu_buf_set_user_ie(dbuf, ds, &ds->ds_phys, 415 dsl_dataset_evict); 416 } 417 if (err || winner) { 418 bplist_close(&ds->ds_deadlist); 419 if (ds->ds_prev) 420 dsl_dataset_drop_ref(ds->ds_prev, ds); 421 dsl_dir_close(ds->ds_dir, ds); 422 mutex_destroy(&ds->ds_lock); 423 mutex_destroy(&ds->ds_opening_lock); 424 mutex_destroy(&ds->ds_deadlist.bpl_lock); 425 rw_destroy(&ds->ds_rwlock); 426 cv_destroy(&ds->ds_exclusive_cv); 427 kmem_free(ds, sizeof (dsl_dataset_t)); 428 if (err) { 429 dmu_buf_rele(dbuf, tag); 430 return (err); 431 } 432 ds = winner; 433 } else { 434 ds->ds_fsid_guid = 435 unique_insert(ds->ds_phys->ds_fsid_guid); 436 } 437 } 438 ASSERT3P(ds->ds_dbuf, ==, dbuf); 439 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 440 mutex_enter(&ds->ds_lock); 441 if (!dsl_pool_sync_context(dp) && DSL_DATASET_IS_DESTROYED(ds)) { 442 mutex_exit(&ds->ds_lock); 443 dmu_buf_rele(ds->ds_dbuf, tag); 444 return (ENOENT); 445 } 446 mutex_exit(&ds->ds_lock); 447 *dsp = ds; 448 return (0); 449 } 450 451 static int 452 dsl_dataset_hold_ref(dsl_dataset_t *ds, void *tag) 453 { 454 dsl_pool_t *dp = ds->ds_dir->dd_pool; 455 456 /* 457 * In syncing context we don't want the rwlock lock: there 458 * may be an existing writer waiting for sync phase to 459 * finish. We don't need to worry about such writers, since 460 * sync phase is single-threaded, so the writer can't be 461 * doing anything while we are active. 462 */ 463 if (dsl_pool_sync_context(dp)) { 464 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 465 return (0); 466 } 467 468 /* 469 * Normal users will hold the ds_rwlock as a READER until they 470 * are finished (i.e., call dsl_dataset_rele()). "Owners" will 471 * drop their READER lock after they set the ds_owner field. 472 * 473 * If the dataset is being destroyed, the destroy thread will 474 * obtain a WRITER lock for exclusive access after it's done its 475 * open-context work and then change the ds_owner to 476 * dsl_reaper once destruction is assured. So threads 477 * may block here temporarily, until the "destructability" of 478 * the dataset is determined. 479 */ 480 ASSERT(!RW_WRITE_HELD(&dp->dp_config_rwlock)); 481 mutex_enter(&ds->ds_lock); 482 while (!rw_tryenter(&ds->ds_rwlock, RW_READER)) { 483 rw_exit(&dp->dp_config_rwlock); 484 cv_wait(&ds->ds_exclusive_cv, &ds->ds_lock); 485 if (DSL_DATASET_IS_DESTROYED(ds)) { 486 mutex_exit(&ds->ds_lock); 487 dsl_dataset_drop_ref(ds, tag); 488 rw_enter(&dp->dp_config_rwlock, RW_READER); 489 return (ENOENT); 490 } 491 rw_enter(&dp->dp_config_rwlock, RW_READER); 492 } 493 mutex_exit(&ds->ds_lock); 494 return (0); 495 } 496 497 int 498 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 499 dsl_dataset_t **dsp) 500 { 501 int err = dsl_dataset_get_ref(dp, dsobj, tag, dsp); 502 503 if (err) 504 return (err); 505 return (dsl_dataset_hold_ref(*dsp, tag)); 506 } 507 508 int 509 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, int flags, void *owner, 510 dsl_dataset_t **dsp) 511 { 512 int err = dsl_dataset_hold_obj(dp, dsobj, owner, dsp); 513 514 ASSERT(DS_MODE_TYPE(flags) != DS_MODE_USER); 515 516 if (err) 517 return (err); 518 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 519 dsl_dataset_rele(*dsp, owner); 520 return (EBUSY); 521 } 522 return (0); 523 } 524 525 int 526 dsl_dataset_hold(const char *name, void *tag, dsl_dataset_t **dsp) 527 { 528 dsl_dir_t *dd; 529 dsl_pool_t *dp; 530 const char *snapname; 531 uint64_t obj; 532 int err = 0; 533 534 err = dsl_dir_open_spa(NULL, name, FTAG, &dd, &snapname); 535 if (err) 536 return (err); 537 538 dp = dd->dd_pool; 539 obj = dd->dd_phys->dd_head_dataset_obj; 540 rw_enter(&dp->dp_config_rwlock, RW_READER); 541 if (obj) 542 err = dsl_dataset_get_ref(dp, obj, tag, dsp); 543 else 544 err = ENOENT; 545 if (err) 546 goto out; 547 548 err = dsl_dataset_hold_ref(*dsp, tag); 549 550 /* we may be looking for a snapshot */ 551 if (err == 0 && snapname != NULL) { 552 dsl_dataset_t *ds = NULL; 553 554 if (*snapname++ != '@') { 555 dsl_dataset_rele(*dsp, tag); 556 err = ENOENT; 557 goto out; 558 } 559 560 dprintf("looking for snapshot '%s'\n", snapname); 561 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 562 if (err == 0) 563 err = dsl_dataset_get_ref(dp, obj, tag, &ds); 564 dsl_dataset_rele(*dsp, tag); 565 566 ASSERT3U((err == 0), ==, (ds != NULL)); 567 568 if (ds) { 569 mutex_enter(&ds->ds_lock); 570 if (ds->ds_snapname[0] == 0) 571 (void) strlcpy(ds->ds_snapname, snapname, 572 sizeof (ds->ds_snapname)); 573 mutex_exit(&ds->ds_lock); 574 err = dsl_dataset_hold_ref(ds, tag); 575 *dsp = err ? NULL : ds; 576 } 577 } 578 out: 579 rw_exit(&dp->dp_config_rwlock); 580 dsl_dir_close(dd, FTAG); 581 return (err); 582 } 583 584 int 585 dsl_dataset_own(const char *name, int flags, void *owner, dsl_dataset_t **dsp) 586 { 587 int err = dsl_dataset_hold(name, owner, dsp); 588 if (err) 589 return (err); 590 if ((*dsp)->ds_phys->ds_num_children > 0 && 591 !DS_MODE_IS_READONLY(flags)) { 592 dsl_dataset_rele(*dsp, owner); 593 return (EROFS); 594 } 595 if (!dsl_dataset_tryown(*dsp, DS_MODE_IS_INCONSISTENT(flags), owner)) { 596 dsl_dataset_rele(*dsp, owner); 597 return (EBUSY); 598 } 599 return (0); 600 } 601 602 void 603 dsl_dataset_name(dsl_dataset_t *ds, char *name) 604 { 605 if (ds == NULL) { 606 (void) strcpy(name, "mos"); 607 } else { 608 dsl_dir_name(ds->ds_dir, name); 609 VERIFY(0 == dsl_dataset_get_snapname(ds)); 610 if (ds->ds_snapname[0]) { 611 (void) strcat(name, "@"); 612 /* 613 * We use a "recursive" mutex so that we 614 * can call dprintf_ds() with ds_lock held. 615 */ 616 if (!MUTEX_HELD(&ds->ds_lock)) { 617 mutex_enter(&ds->ds_lock); 618 (void) strcat(name, ds->ds_snapname); 619 mutex_exit(&ds->ds_lock); 620 } else { 621 (void) strcat(name, ds->ds_snapname); 622 } 623 } 624 } 625 } 626 627 static int 628 dsl_dataset_namelen(dsl_dataset_t *ds) 629 { 630 int result; 631 632 if (ds == NULL) { 633 result = 3; /* "mos" */ 634 } else { 635 result = dsl_dir_namelen(ds->ds_dir); 636 VERIFY(0 == dsl_dataset_get_snapname(ds)); 637 if (ds->ds_snapname[0]) { 638 ++result; /* adding one for the @-sign */ 639 if (!MUTEX_HELD(&ds->ds_lock)) { 640 mutex_enter(&ds->ds_lock); 641 result += strlen(ds->ds_snapname); 642 mutex_exit(&ds->ds_lock); 643 } else { 644 result += strlen(ds->ds_snapname); 645 } 646 } 647 } 648 649 return (result); 650 } 651 652 static void 653 dsl_dataset_drop_ref(dsl_dataset_t *ds, void *tag) 654 { 655 dmu_buf_rele(ds->ds_dbuf, tag); 656 } 657 658 void 659 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 660 { 661 ASSERT(ds->ds_owner != tag); 662 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) { 663 rw_exit(&ds->ds_rwlock); 664 } 665 dsl_dataset_drop_ref(ds, tag); 666 } 667 668 void 669 dsl_dataset_disown(dsl_dataset_t *ds, void *owner) 670 { 671 ASSERT((ds->ds_owner == owner && ds->ds_dbuf) || 672 (DSL_DATASET_IS_DESTROYED(ds) && ds->ds_dbuf == NULL)); 673 674 mutex_enter(&ds->ds_lock); 675 ds->ds_owner = NULL; 676 if (RW_WRITE_HELD(&ds->ds_rwlock)) { 677 rw_exit(&ds->ds_rwlock); 678 cv_broadcast(&ds->ds_exclusive_cv); 679 } 680 mutex_exit(&ds->ds_lock); 681 if (ds->ds_dbuf) 682 dsl_dataset_drop_ref(ds, owner); 683 else 684 dsl_dataset_evict(ds->ds_dbuf, ds); 685 } 686 687 boolean_t 688 dsl_dataset_tryown(dsl_dataset_t *ds, boolean_t inconsistentok, void *owner) 689 { 690 boolean_t gotit = FALSE; 691 692 mutex_enter(&ds->ds_lock); 693 if (ds->ds_owner == NULL && 694 (!DS_IS_INCONSISTENT(ds) || inconsistentok)) { 695 ds->ds_owner = owner; 696 if (!dsl_pool_sync_context(ds->ds_dir->dd_pool)) 697 rw_exit(&ds->ds_rwlock); 698 gotit = TRUE; 699 } 700 mutex_exit(&ds->ds_lock); 701 return (gotit); 702 } 703 704 void 705 dsl_dataset_make_exclusive(dsl_dataset_t *ds, void *owner) 706 { 707 ASSERT3P(owner, ==, ds->ds_owner); 708 if (!RW_WRITE_HELD(&ds->ds_rwlock)) 709 rw_enter(&ds->ds_rwlock, RW_WRITER); 710 } 711 712 void 713 dsl_dataset_create_root(dsl_pool_t *dp, uint64_t *ddobjp, dmu_tx_t *tx) 714 { 715 objset_t *mos = dp->dp_meta_objset; 716 dmu_buf_t *dbuf; 717 dsl_dataset_phys_t *dsphys; 718 dsl_dataset_t *ds; 719 uint64_t dsobj; 720 dsl_dir_t *dd; 721 722 dsl_dir_create_root(mos, ddobjp, tx); 723 VERIFY(0 == dsl_dir_open_obj(dp, *ddobjp, NULL, FTAG, &dd)); 724 725 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 726 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 727 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 728 dmu_buf_will_dirty(dbuf, tx); 729 dsphys = dbuf->db_data; 730 dsphys->ds_dir_obj = dd->dd_object; 731 dsphys->ds_fsid_guid = unique_create(); 732 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 733 sizeof (dsphys->ds_guid)); 734 dsphys->ds_snapnames_zapobj = 735 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 736 DMU_OT_NONE, 0, tx); 737 dsphys->ds_creation_time = gethrestime_sec(); 738 dsphys->ds_creation_txg = tx->tx_txg; 739 dsphys->ds_deadlist_obj = 740 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 741 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 742 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 743 dmu_buf_rele(dbuf, FTAG); 744 745 dmu_buf_will_dirty(dd->dd_dbuf, tx); 746 dd->dd_phys->dd_head_dataset_obj = dsobj; 747 dsl_dir_close(dd, FTAG); 748 749 VERIFY(0 == dsl_dataset_get_ref(dp, dsobj, FTAG, &ds)); 750 (void) dmu_objset_create_impl(dp->dp_spa, ds, 751 &ds->ds_phys->ds_bp, DMU_OST_ZFS, tx); 752 dsl_dataset_drop_ref(ds, FTAG); 753 } 754 755 uint64_t 756 dsl_dataset_create_sync_impl(dsl_dir_t *dd, dsl_dataset_t *origin, 757 uint64_t flags, dmu_tx_t *tx) 758 { 759 dsl_pool_t *dp = dd->dd_pool; 760 dmu_buf_t *dbuf; 761 dsl_dataset_phys_t *dsphys; 762 uint64_t dsobj; 763 objset_t *mos = dp->dp_meta_objset; 764 765 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 766 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 767 ASSERT(dmu_tx_is_syncing(tx)); 768 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 769 770 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 771 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 772 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 773 dmu_buf_will_dirty(dbuf, tx); 774 dsphys = dbuf->db_data; 775 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 776 dsphys->ds_dir_obj = dd->dd_object; 777 dsphys->ds_flags = flags; 778 dsphys->ds_fsid_guid = unique_create(); 779 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 780 sizeof (dsphys->ds_guid)); 781 dsphys->ds_snapnames_zapobj = 782 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 783 DMU_OT_NONE, 0, tx); 784 dsphys->ds_creation_time = gethrestime_sec(); 785 dsphys->ds_creation_txg = tx->tx_txg; 786 dsphys->ds_deadlist_obj = 787 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 788 789 if (origin) { 790 dsphys->ds_prev_snap_obj = origin->ds_object; 791 dsphys->ds_prev_snap_txg = 792 origin->ds_phys->ds_creation_txg; 793 dsphys->ds_used_bytes = 794 origin->ds_phys->ds_used_bytes; 795 dsphys->ds_compressed_bytes = 796 origin->ds_phys->ds_compressed_bytes; 797 dsphys->ds_uncompressed_bytes = 798 origin->ds_phys->ds_uncompressed_bytes; 799 dsphys->ds_bp = origin->ds_phys->ds_bp; 800 dsphys->ds_flags |= origin->ds_phys->ds_flags; 801 802 dmu_buf_will_dirty(origin->ds_dbuf, tx); 803 origin->ds_phys->ds_num_children++; 804 805 dmu_buf_will_dirty(dd->dd_dbuf, tx); 806 dd->dd_phys->dd_origin_obj = origin->ds_object; 807 } 808 809 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 810 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 811 812 dmu_buf_rele(dbuf, FTAG); 813 814 dmu_buf_will_dirty(dd->dd_dbuf, tx); 815 dd->dd_phys->dd_head_dataset_obj = dsobj; 816 817 return (dsobj); 818 } 819 820 uint64_t 821 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 822 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 823 { 824 dsl_pool_t *dp = pdd->dd_pool; 825 uint64_t dsobj, ddobj; 826 dsl_dir_t *dd; 827 828 ASSERT(lastname[0] != '@'); 829 830 ddobj = dsl_dir_create_sync(pdd, lastname, tx); 831 VERIFY(0 == dsl_dir_open_obj(dp, ddobj, lastname, FTAG, &dd)); 832 833 dsobj = dsl_dataset_create_sync_impl(dd, origin, flags, tx); 834 835 dsl_deleg_set_create_perms(dd, tx, cr); 836 837 dsl_dir_close(dd, FTAG); 838 839 return (dsobj); 840 } 841 842 struct destroyarg { 843 dsl_sync_task_group_t *dstg; 844 char *snapname; 845 char *failed; 846 }; 847 848 static int 849 dsl_snapshot_destroy_one(char *name, void *arg) 850 { 851 struct destroyarg *da = arg; 852 dsl_dataset_t *ds; 853 char *cp; 854 int err; 855 856 (void) strcat(name, "@"); 857 (void) strcat(name, da->snapname); 858 err = dsl_dataset_own(name, DS_MODE_READONLY | DS_MODE_INCONSISTENT, 859 da->dstg, &ds); 860 cp = strchr(name, '@'); 861 *cp = '\0'; 862 if (err == 0) { 863 dsl_dataset_make_exclusive(ds, da->dstg); 864 dsl_sync_task_create(da->dstg, dsl_dataset_destroy_check, 865 dsl_dataset_destroy_sync, ds, da->dstg, 0); 866 } else if (err == ENOENT) { 867 err = 0; 868 } else { 869 (void) strcpy(da->failed, name); 870 } 871 return (err); 872 } 873 874 /* 875 * Destroy 'snapname' in all descendants of 'fsname'. 876 */ 877 #pragma weak dmu_snapshots_destroy = dsl_snapshots_destroy 878 int 879 dsl_snapshots_destroy(char *fsname, char *snapname) 880 { 881 int err; 882 struct destroyarg da; 883 dsl_sync_task_t *dst; 884 spa_t *spa; 885 886 err = spa_open(fsname, &spa, FTAG); 887 if (err) 888 return (err); 889 da.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 890 da.snapname = snapname; 891 da.failed = fsname; 892 893 err = dmu_objset_find(fsname, 894 dsl_snapshot_destroy_one, &da, DS_FIND_CHILDREN); 895 896 if (err == 0) 897 err = dsl_sync_task_group_wait(da.dstg); 898 899 for (dst = list_head(&da.dstg->dstg_tasks); dst; 900 dst = list_next(&da.dstg->dstg_tasks, dst)) { 901 dsl_dataset_t *ds = dst->dst_arg1; 902 /* 903 * Return the file system name that triggered the error 904 */ 905 if (dst->dst_err) { 906 dsl_dataset_name(ds, fsname); 907 *strchr(fsname, '@') = '\0'; 908 } 909 dsl_dataset_disown(ds, da.dstg); 910 } 911 912 dsl_sync_task_group_destroy(da.dstg); 913 spa_close(spa, FTAG); 914 return (err); 915 } 916 917 /* 918 * ds must be opened as OWNER. On return (whether successful or not), 919 * ds will be closed and caller can no longer dereference it. 920 */ 921 int 922 dsl_dataset_destroy(dsl_dataset_t *ds, void *tag) 923 { 924 int err; 925 dsl_sync_task_group_t *dstg; 926 objset_t *os; 927 dsl_dir_t *dd; 928 uint64_t obj; 929 930 if (dsl_dataset_is_snapshot(ds)) { 931 /* Destroying a snapshot is simpler */ 932 dsl_dataset_make_exclusive(ds, tag); 933 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 934 dsl_dataset_destroy_check, dsl_dataset_destroy_sync, 935 ds, tag, 0); 936 goto out; 937 } 938 939 dd = ds->ds_dir; 940 941 /* 942 * Check for errors and mark this ds as inconsistent, in 943 * case we crash while freeing the objects. 944 */ 945 err = dsl_sync_task_do(dd->dd_pool, dsl_dataset_destroy_begin_check, 946 dsl_dataset_destroy_begin_sync, ds, NULL, 0); 947 if (err) 948 goto out; 949 950 err = dmu_objset_open_ds(ds, DMU_OST_ANY, &os); 951 if (err) 952 goto out; 953 954 /* 955 * remove the objects in open context, so that we won't 956 * have too much to do in syncing context. 957 */ 958 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 959 ds->ds_phys->ds_prev_snap_txg)) { 960 dmu_tx_t *tx = dmu_tx_create(os); 961 dmu_tx_hold_free(tx, obj, 0, DMU_OBJECT_END); 962 dmu_tx_hold_bonus(tx, obj); 963 err = dmu_tx_assign(tx, TXG_WAIT); 964 if (err) { 965 /* 966 * Perhaps there is not enough disk 967 * space. Just deal with it from 968 * dsl_dataset_destroy_sync(). 969 */ 970 dmu_tx_abort(tx); 971 continue; 972 } 973 VERIFY(0 == dmu_object_free(os, obj, tx)); 974 dmu_tx_commit(tx); 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 ASSERT(ds->ds_owner); 1024 1025 return (dsl_sync_task_do(ds->ds_dir->dd_pool, 1026 dsl_dataset_rollback_check, dsl_dataset_rollback_sync, 1027 ds, &ost, 0)); 1028 } 1029 1030 void * 1031 dsl_dataset_set_user_ptr(dsl_dataset_t *ds, 1032 void *p, dsl_dataset_evict_func_t func) 1033 { 1034 void *old; 1035 1036 mutex_enter(&ds->ds_lock); 1037 old = ds->ds_user_ptr; 1038 if (old == NULL) { 1039 ds->ds_user_ptr = p; 1040 ds->ds_user_evict_func = func; 1041 } 1042 mutex_exit(&ds->ds_lock); 1043 return (old); 1044 } 1045 1046 void * 1047 dsl_dataset_get_user_ptr(dsl_dataset_t *ds) 1048 { 1049 return (ds->ds_user_ptr); 1050 } 1051 1052 1053 blkptr_t * 1054 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1055 { 1056 return (&ds->ds_phys->ds_bp); 1057 } 1058 1059 void 1060 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 1061 { 1062 ASSERT(dmu_tx_is_syncing(tx)); 1063 /* If it's the meta-objset, set dp_meta_rootbp */ 1064 if (ds == NULL) { 1065 tx->tx_pool->dp_meta_rootbp = *bp; 1066 } else { 1067 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1068 ds->ds_phys->ds_bp = *bp; 1069 } 1070 } 1071 1072 spa_t * 1073 dsl_dataset_get_spa(dsl_dataset_t *ds) 1074 { 1075 return (ds->ds_dir->dd_pool->dp_spa); 1076 } 1077 1078 void 1079 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1080 { 1081 dsl_pool_t *dp; 1082 1083 if (ds == NULL) /* this is the meta-objset */ 1084 return; 1085 1086 ASSERT(ds->ds_user_ptr != NULL); 1087 1088 if (ds->ds_phys->ds_next_snap_obj != 0) 1089 panic("dirtying snapshot!"); 1090 1091 dp = ds->ds_dir->dd_pool; 1092 1093 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg) == 0) { 1094 /* up the hold count until we can be written out */ 1095 dmu_buf_add_ref(ds->ds_dbuf, ds); 1096 } 1097 } 1098 1099 /* 1100 * The unique space in the head dataset can be calculated by subtracting 1101 * the space used in the most recent snapshot, that is still being used 1102 * in this file system, from the space currently in use. To figure out 1103 * the space in the most recent snapshot still in use, we need to take 1104 * the total space used in the snapshot and subtract out the space that 1105 * has been freed up since the snapshot was taken. 1106 */ 1107 static void 1108 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 1109 { 1110 uint64_t mrs_used; 1111 uint64_t dlused, dlcomp, dluncomp; 1112 1113 ASSERT(ds->ds_object == ds->ds_dir->dd_phys->dd_head_dataset_obj); 1114 1115 if (ds->ds_phys->ds_prev_snap_obj != 0) 1116 mrs_used = ds->ds_prev->ds_phys->ds_used_bytes; 1117 else 1118 mrs_used = 0; 1119 1120 VERIFY(0 == bplist_space(&ds->ds_deadlist, &dlused, &dlcomp, 1121 &dluncomp)); 1122 1123 ASSERT3U(dlused, <=, mrs_used); 1124 ds->ds_phys->ds_unique_bytes = 1125 ds->ds_phys->ds_used_bytes - (mrs_used - dlused); 1126 1127 if (!DS_UNIQUE_IS_ACCURATE(ds) && 1128 spa_version(ds->ds_dir->dd_pool->dp_spa) >= 1129 SPA_VERSION_UNIQUE_ACCURATE) 1130 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1131 } 1132 1133 static uint64_t 1134 dsl_dataset_unique(dsl_dataset_t *ds) 1135 { 1136 if (!DS_UNIQUE_IS_ACCURATE(ds) && !dsl_dataset_is_snapshot(ds)) 1137 dsl_dataset_recalc_head_uniq(ds); 1138 1139 return (ds->ds_phys->ds_unique_bytes); 1140 } 1141 1142 struct killarg { 1143 int64_t *usedp; 1144 int64_t *compressedp; 1145 int64_t *uncompressedp; 1146 zio_t *zio; 1147 dmu_tx_t *tx; 1148 }; 1149 1150 static int 1151 kill_blkptr(traverse_blk_cache_t *bc, spa_t *spa, void *arg) 1152 { 1153 struct killarg *ka = arg; 1154 blkptr_t *bp = &bc->bc_blkptr; 1155 1156 ASSERT3U(bc->bc_errno, ==, 0); 1157 1158 /* 1159 * Since this callback is not called concurrently, no lock is 1160 * needed on the accounting values. 1161 */ 1162 *ka->usedp += bp_get_dasize(spa, bp); 1163 *ka->compressedp += BP_GET_PSIZE(bp); 1164 *ka->uncompressedp += BP_GET_UCSIZE(bp); 1165 /* XXX check for EIO? */ 1166 (void) arc_free(ka->zio, spa, ka->tx->tx_txg, bp, NULL, NULL, 1167 ARC_NOWAIT); 1168 return (0); 1169 } 1170 1171 /* ARGSUSED */ 1172 static int 1173 dsl_dataset_rollback_check(void *arg1, void *arg2, dmu_tx_t *tx) 1174 { 1175 dsl_dataset_t *ds = arg1; 1176 dmu_objset_type_t *ost = arg2; 1177 1178 /* 1179 * We can only roll back to emptyness if it is a ZPL objset. 1180 */ 1181 if (*ost != DMU_OST_ZFS && ds->ds_phys->ds_prev_snap_txg == 0) 1182 return (EINVAL); 1183 1184 /* 1185 * This must not be a snapshot. 1186 */ 1187 if (ds->ds_phys->ds_next_snap_obj != 0) 1188 return (EINVAL); 1189 1190 /* 1191 * If we made changes this txg, traverse_dsl_dataset won't find 1192 * them. Try again. 1193 */ 1194 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1195 return (EAGAIN); 1196 1197 return (0); 1198 } 1199 1200 /* ARGSUSED */ 1201 static void 1202 dsl_dataset_rollback_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1203 { 1204 dsl_dataset_t *ds = arg1; 1205 dmu_objset_type_t *ost = arg2; 1206 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1207 1208 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1209 1210 /* 1211 * Before the roll back destroy the zil. 1212 */ 1213 if (ds->ds_user_ptr != NULL) { 1214 zil_rollback_destroy( 1215 ((objset_impl_t *)ds->ds_user_ptr)->os_zil, tx); 1216 1217 /* 1218 * We need to make sure that the objset_impl_t is reopened after 1219 * we do the rollback, otherwise it will have the wrong 1220 * objset_phys_t. Normally this would happen when this 1221 * dataset-open is closed, thus causing the 1222 * dataset to be immediately evicted. But when doing "zfs recv 1223 * -F", we reopen the objset before that, so that there is no 1224 * window where the dataset is closed and inconsistent. 1225 */ 1226 ds->ds_user_evict_func(ds, ds->ds_user_ptr); 1227 ds->ds_user_ptr = NULL; 1228 } 1229 1230 /* Zero out the deadlist. */ 1231 bplist_close(&ds->ds_deadlist); 1232 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1233 ds->ds_phys->ds_deadlist_obj = 1234 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1235 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1236 ds->ds_phys->ds_deadlist_obj)); 1237 1238 { 1239 /* Free blkptrs that we gave birth to */ 1240 zio_t *zio; 1241 int64_t used = 0, compressed = 0, uncompressed = 0; 1242 struct killarg ka; 1243 int64_t delta; 1244 1245 zio = zio_root(tx->tx_pool->dp_spa, NULL, NULL, 1246 ZIO_FLAG_MUSTSUCCEED); 1247 ka.usedp = &used; 1248 ka.compressedp = &compressed; 1249 ka.uncompressedp = &uncompressed; 1250 ka.zio = zio; 1251 ka.tx = tx; 1252 (void) traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1253 ADVANCE_POST, kill_blkptr, &ka); 1254 (void) zio_wait(zio); 1255 1256 /* only deduct space beyond any refreservation */ 1257 delta = parent_delta(ds, -used); 1258 dsl_dir_diduse_space(ds->ds_dir, 1259 delta, -compressed, -uncompressed, tx); 1260 } 1261 1262 if (ds->ds_prev) { 1263 /* Change our contents to that of the prev snapshot */ 1264 ASSERT3U(ds->ds_prev->ds_object, ==, 1265 ds->ds_phys->ds_prev_snap_obj); 1266 ds->ds_phys->ds_bp = ds->ds_prev->ds_phys->ds_bp; 1267 ds->ds_phys->ds_used_bytes = 1268 ds->ds_prev->ds_phys->ds_used_bytes; 1269 ds->ds_phys->ds_compressed_bytes = 1270 ds->ds_prev->ds_phys->ds_compressed_bytes; 1271 ds->ds_phys->ds_uncompressed_bytes = 1272 ds->ds_prev->ds_phys->ds_uncompressed_bytes; 1273 ds->ds_phys->ds_flags = ds->ds_prev->ds_phys->ds_flags; 1274 ds->ds_phys->ds_unique_bytes = 0; 1275 1276 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1277 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1278 ds->ds_prev->ds_phys->ds_unique_bytes = 0; 1279 } 1280 } else { 1281 /* Zero out our contents, recreate objset */ 1282 bzero(&ds->ds_phys->ds_bp, sizeof (blkptr_t)); 1283 ds->ds_phys->ds_used_bytes = 0; 1284 ds->ds_phys->ds_compressed_bytes = 0; 1285 ds->ds_phys->ds_uncompressed_bytes = 0; 1286 ds->ds_phys->ds_flags = 0; 1287 ds->ds_phys->ds_unique_bytes = 0; 1288 (void) dmu_objset_create_impl(ds->ds_dir->dd_pool->dp_spa, ds, 1289 &ds->ds_phys->ds_bp, *ost, tx); 1290 } 1291 1292 spa_history_internal_log(LOG_DS_ROLLBACK, ds->ds_dir->dd_pool->dp_spa, 1293 tx, cr, "dataset = %llu", ds->ds_object); 1294 } 1295 1296 /* ARGSUSED */ 1297 static int 1298 dsl_dataset_destroy_begin_check(void *arg1, void *arg2, dmu_tx_t *tx) 1299 { 1300 dsl_dataset_t *ds = arg1; 1301 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1302 uint64_t count; 1303 int err; 1304 1305 /* 1306 * Can't delete a head dataset if there are snapshots of it. 1307 * (Except if the only snapshots are from the branch we cloned 1308 * from.) 1309 */ 1310 if (ds->ds_prev != NULL && 1311 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1312 return (EINVAL); 1313 1314 /* 1315 * This is really a dsl_dir thing, but check it here so that 1316 * we'll be less likely to leave this dataset inconsistent & 1317 * nearly destroyed. 1318 */ 1319 err = zap_count(mos, ds->ds_dir->dd_phys->dd_child_dir_zapobj, &count); 1320 if (err) 1321 return (err); 1322 if (count != 0) 1323 return (EEXIST); 1324 1325 return (0); 1326 } 1327 1328 /* ARGSUSED */ 1329 static void 1330 dsl_dataset_destroy_begin_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1331 { 1332 dsl_dataset_t *ds = arg1; 1333 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1334 1335 /* Mark it as inconsistent on-disk, in case we crash */ 1336 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1337 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 1338 1339 spa_history_internal_log(LOG_DS_DESTROY_BEGIN, dp->dp_spa, tx, 1340 cr, "dataset = %llu", ds->ds_object); 1341 } 1342 1343 /* ARGSUSED */ 1344 int 1345 dsl_dataset_destroy_check(void *arg1, void *arg2, dmu_tx_t *tx) 1346 { 1347 dsl_dataset_t *ds = arg1; 1348 1349 /* we have an owner hold, so noone else can destroy us */ 1350 ASSERT(!DSL_DATASET_IS_DESTROYED(ds)); 1351 1352 /* Can't delete a branch point. */ 1353 if (ds->ds_phys->ds_num_children > 1) 1354 return (EEXIST); 1355 1356 /* 1357 * Can't delete a head dataset if there are snapshots of it. 1358 * (Except if the only snapshots are from the branch we cloned 1359 * from.) 1360 */ 1361 if (ds->ds_prev != NULL && 1362 ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) 1363 return (EINVAL); 1364 1365 /* 1366 * If we made changes this txg, traverse_dsl_dataset won't find 1367 * them. Try again. 1368 */ 1369 if (ds->ds_phys->ds_bp.blk_birth >= tx->tx_txg) 1370 return (EAGAIN); 1371 1372 /* XXX we should do some i/o error checking... */ 1373 return (0); 1374 } 1375 1376 struct refsarg { 1377 kmutex_t lock; 1378 boolean_t gone; 1379 kcondvar_t cv; 1380 }; 1381 1382 /* ARGSUSED */ 1383 static void 1384 dsl_dataset_refs_gone(dmu_buf_t *db, void *argv) 1385 { 1386 struct refsarg *arg = argv; 1387 1388 mutex_enter(&arg->lock); 1389 arg->gone = TRUE; 1390 cv_signal(&arg->cv); 1391 mutex_exit(&arg->lock); 1392 } 1393 1394 static void 1395 dsl_dataset_drain_refs(dsl_dataset_t *ds, void *tag) 1396 { 1397 struct refsarg arg; 1398 1399 mutex_init(&arg.lock, NULL, MUTEX_DEFAULT, NULL); 1400 cv_init(&arg.cv, NULL, CV_DEFAULT, NULL); 1401 arg.gone = FALSE; 1402 (void) dmu_buf_update_user(ds->ds_dbuf, ds, &arg, &ds->ds_phys, 1403 dsl_dataset_refs_gone); 1404 dmu_buf_rele(ds->ds_dbuf, tag); 1405 mutex_enter(&arg.lock); 1406 while (!arg.gone) 1407 cv_wait(&arg.cv, &arg.lock); 1408 ASSERT(arg.gone); 1409 mutex_exit(&arg.lock); 1410 ds->ds_dbuf = NULL; 1411 ds->ds_phys = NULL; 1412 mutex_destroy(&arg.lock); 1413 cv_destroy(&arg.cv); 1414 } 1415 1416 void 1417 dsl_dataset_destroy_sync(void *arg1, void *tag, cred_t *cr, dmu_tx_t *tx) 1418 { 1419 dsl_dataset_t *ds = arg1; 1420 int64_t used = 0, compressed = 0, uncompressed = 0; 1421 zio_t *zio; 1422 int err; 1423 int after_branch_point = FALSE; 1424 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1425 objset_t *mos = dp->dp_meta_objset; 1426 dsl_dataset_t *ds_prev = NULL; 1427 uint64_t obj; 1428 1429 ASSERT(ds->ds_owner); 1430 ASSERT3U(ds->ds_phys->ds_num_children, <=, 1); 1431 ASSERT(ds->ds_prev == NULL || 1432 ds->ds_prev->ds_phys->ds_next_snap_obj != ds->ds_object); 1433 ASSERT3U(ds->ds_phys->ds_bp.blk_birth, <=, tx->tx_txg); 1434 1435 /* signal any waiters that this dataset is going away */ 1436 mutex_enter(&ds->ds_lock); 1437 ds->ds_owner = dsl_reaper; 1438 cv_broadcast(&ds->ds_exclusive_cv); 1439 mutex_exit(&ds->ds_lock); 1440 1441 /* Remove our reservation */ 1442 if (ds->ds_reserved != 0) { 1443 uint64_t val = 0; 1444 dsl_dataset_set_reservation_sync(ds, &val, cr, tx); 1445 ASSERT3U(ds->ds_reserved, ==, 0); 1446 } 1447 1448 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1449 1450 obj = ds->ds_object; 1451 1452 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1453 if (ds->ds_prev) { 1454 ds_prev = ds->ds_prev; 1455 } else { 1456 VERIFY(0 == dsl_dataset_hold_obj(dp, 1457 ds->ds_phys->ds_prev_snap_obj, FTAG, &ds_prev)); 1458 } 1459 after_branch_point = 1460 (ds_prev->ds_phys->ds_next_snap_obj != obj); 1461 1462 dmu_buf_will_dirty(ds_prev->ds_dbuf, tx); 1463 if (after_branch_point && 1464 ds->ds_phys->ds_next_snap_obj == 0) { 1465 /* This clone is toast. */ 1466 ASSERT(ds_prev->ds_phys->ds_num_children > 1); 1467 ds_prev->ds_phys->ds_num_children--; 1468 } else if (!after_branch_point) { 1469 ds_prev->ds_phys->ds_next_snap_obj = 1470 ds->ds_phys->ds_next_snap_obj; 1471 } 1472 } 1473 1474 zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1475 1476 if (ds->ds_phys->ds_next_snap_obj != 0) { 1477 blkptr_t bp; 1478 dsl_dataset_t *ds_next; 1479 uint64_t itor = 0; 1480 uint64_t old_unique; 1481 1482 spa_scrub_restart(dp->dp_spa, tx->tx_txg); 1483 1484 VERIFY(0 == dsl_dataset_hold_obj(dp, 1485 ds->ds_phys->ds_next_snap_obj, FTAG, &ds_next)); 1486 ASSERT3U(ds_next->ds_phys->ds_prev_snap_obj, ==, obj); 1487 1488 old_unique = dsl_dataset_unique(ds_next); 1489 1490 dmu_buf_will_dirty(ds_next->ds_dbuf, tx); 1491 ds_next->ds_phys->ds_prev_snap_obj = 1492 ds->ds_phys->ds_prev_snap_obj; 1493 ds_next->ds_phys->ds_prev_snap_txg = 1494 ds->ds_phys->ds_prev_snap_txg; 1495 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1496 ds_prev ? ds_prev->ds_phys->ds_creation_txg : 0); 1497 1498 /* 1499 * Transfer to our deadlist (which will become next's 1500 * new deadlist) any entries from next's current 1501 * deadlist which were born before prev, and free the 1502 * other entries. 1503 * 1504 * XXX we're doing this long task with the config lock held 1505 */ 1506 while (bplist_iterate(&ds_next->ds_deadlist, &itor, &bp) == 0) { 1507 if (bp.blk_birth <= ds->ds_phys->ds_prev_snap_txg) { 1508 VERIFY(0 == bplist_enqueue(&ds->ds_deadlist, 1509 &bp, tx)); 1510 if (ds_prev && !after_branch_point && 1511 bp.blk_birth > 1512 ds_prev->ds_phys->ds_prev_snap_txg) { 1513 ds_prev->ds_phys->ds_unique_bytes += 1514 bp_get_dasize(dp->dp_spa, &bp); 1515 } 1516 } else { 1517 used += bp_get_dasize(dp->dp_spa, &bp); 1518 compressed += BP_GET_PSIZE(&bp); 1519 uncompressed += BP_GET_UCSIZE(&bp); 1520 /* XXX check return value? */ 1521 (void) arc_free(zio, dp->dp_spa, tx->tx_txg, 1522 &bp, NULL, NULL, ARC_NOWAIT); 1523 } 1524 } 1525 1526 /* free next's deadlist */ 1527 bplist_close(&ds_next->ds_deadlist); 1528 bplist_destroy(mos, ds_next->ds_phys->ds_deadlist_obj, tx); 1529 1530 /* set next's deadlist to our deadlist */ 1531 bplist_close(&ds->ds_deadlist); 1532 ds_next->ds_phys->ds_deadlist_obj = 1533 ds->ds_phys->ds_deadlist_obj; 1534 VERIFY(0 == bplist_open(&ds_next->ds_deadlist, mos, 1535 ds_next->ds_phys->ds_deadlist_obj)); 1536 ds->ds_phys->ds_deadlist_obj = 0; 1537 1538 if (ds_next->ds_phys->ds_next_snap_obj != 0) { 1539 /* 1540 * Update next's unique to include blocks which 1541 * were previously shared by only this snapshot 1542 * and it. Those blocks will be born after the 1543 * prev snap and before this snap, and will have 1544 * died after the next snap and before the one 1545 * after that (ie. be on the snap after next's 1546 * deadlist). 1547 * 1548 * XXX we're doing this long task with the 1549 * config lock held 1550 */ 1551 dsl_dataset_t *ds_after_next; 1552 1553 VERIFY(0 == dsl_dataset_hold_obj(dp, 1554 ds_next->ds_phys->ds_next_snap_obj, 1555 FTAG, &ds_after_next)); 1556 itor = 0; 1557 while (bplist_iterate(&ds_after_next->ds_deadlist, 1558 &itor, &bp) == 0) { 1559 if (bp.blk_birth > 1560 ds->ds_phys->ds_prev_snap_txg && 1561 bp.blk_birth <= 1562 ds->ds_phys->ds_creation_txg) { 1563 ds_next->ds_phys->ds_unique_bytes += 1564 bp_get_dasize(dp->dp_spa, &bp); 1565 } 1566 } 1567 1568 dsl_dataset_rele(ds_after_next, FTAG); 1569 ASSERT3P(ds_next->ds_prev, ==, NULL); 1570 } else { 1571 ASSERT3P(ds_next->ds_prev, ==, ds); 1572 dsl_dataset_drop_ref(ds_next->ds_prev, ds_next); 1573 ds_next->ds_prev = NULL; 1574 if (ds_prev) { 1575 VERIFY(0 == dsl_dataset_get_ref(dp, 1576 ds->ds_phys->ds_prev_snap_obj, 1577 ds_next, &ds_next->ds_prev)); 1578 } 1579 1580 dsl_dataset_recalc_head_uniq(ds_next); 1581 1582 /* 1583 * Reduce the amount of our unconsmed refreservation 1584 * being charged to our parent by the amount of 1585 * new unique data we have gained. 1586 */ 1587 if (old_unique < ds_next->ds_reserved) { 1588 int64_t mrsdelta; 1589 uint64_t new_unique = 1590 ds_next->ds_phys->ds_unique_bytes; 1591 1592 ASSERT(old_unique <= new_unique); 1593 mrsdelta = MIN(new_unique - old_unique, 1594 ds_next->ds_reserved - old_unique); 1595 dsl_dir_diduse_space(ds->ds_dir, -mrsdelta, 1596 0, 0, tx); 1597 } 1598 } 1599 dsl_dataset_rele(ds_next, FTAG); 1600 1601 /* 1602 * NB: unique_bytes might not be accurate for the head objset. 1603 * Before SPA_VERSION 9, we didn't update its value when we 1604 * deleted the most recent snapshot. 1605 */ 1606 ASSERT3U(used, ==, ds->ds_phys->ds_unique_bytes); 1607 } else { 1608 /* 1609 * There's no next snapshot, so this is a head dataset. 1610 * Destroy the deadlist. Unless it's a clone, the 1611 * deadlist should be empty. (If it's a clone, it's 1612 * safe to ignore the deadlist contents.) 1613 */ 1614 struct killarg ka; 1615 1616 ASSERT(after_branch_point || bplist_empty(&ds->ds_deadlist)); 1617 bplist_close(&ds->ds_deadlist); 1618 bplist_destroy(mos, ds->ds_phys->ds_deadlist_obj, tx); 1619 ds->ds_phys->ds_deadlist_obj = 0; 1620 1621 /* 1622 * Free everything that we point to (that's born after 1623 * the previous snapshot, if we are a clone) 1624 * 1625 * XXX we're doing this long task with the config lock held 1626 */ 1627 ka.usedp = &used; 1628 ka.compressedp = &compressed; 1629 ka.uncompressedp = &uncompressed; 1630 ka.zio = zio; 1631 ka.tx = tx; 1632 err = traverse_dsl_dataset(ds, ds->ds_phys->ds_prev_snap_txg, 1633 ADVANCE_POST, kill_blkptr, &ka); 1634 ASSERT3U(err, ==, 0); 1635 ASSERT(spa_version(dp->dp_spa) < 1636 SPA_VERSION_UNIQUE_ACCURATE || 1637 used == ds->ds_phys->ds_unique_bytes); 1638 } 1639 1640 err = zio_wait(zio); 1641 ASSERT3U(err, ==, 0); 1642 1643 dsl_dir_diduse_space(ds->ds_dir, -used, -compressed, -uncompressed, tx); 1644 1645 if (ds->ds_dir->dd_phys->dd_head_dataset_obj == ds->ds_object) { 1646 /* Erase the link in the dir */ 1647 dmu_buf_will_dirty(ds->ds_dir->dd_dbuf, tx); 1648 ds->ds_dir->dd_phys->dd_head_dataset_obj = 0; 1649 ASSERT(ds->ds_phys->ds_snapnames_zapobj != 0); 1650 err = zap_destroy(mos, ds->ds_phys->ds_snapnames_zapobj, tx); 1651 ASSERT(err == 0); 1652 } else { 1653 /* remove from snapshot namespace */ 1654 dsl_dataset_t *ds_head; 1655 ASSERT(ds->ds_phys->ds_snapnames_zapobj == 0); 1656 VERIFY(0 == dsl_dataset_hold_obj(dp, 1657 ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ds_head)); 1658 VERIFY(0 == dsl_dataset_get_snapname(ds)); 1659 #ifdef ZFS_DEBUG 1660 { 1661 uint64_t val; 1662 1663 err = dsl_dataset_snap_lookup(ds_head, 1664 ds->ds_snapname, &val); 1665 ASSERT3U(err, ==, 0); 1666 ASSERT3U(val, ==, obj); 1667 } 1668 #endif 1669 err = dsl_dataset_snap_remove(ds_head, ds->ds_snapname, tx); 1670 ASSERT(err == 0); 1671 dsl_dataset_rele(ds_head, FTAG); 1672 } 1673 1674 if (ds_prev && ds->ds_prev != ds_prev) 1675 dsl_dataset_rele(ds_prev, FTAG); 1676 1677 spa_prop_clear_bootfs(dp->dp_spa, ds->ds_object, tx); 1678 spa_history_internal_log(LOG_DS_DESTROY, dp->dp_spa, tx, 1679 cr, "dataset = %llu", ds->ds_object); 1680 1681 dsl_dir_close(ds->ds_dir, ds); 1682 ds->ds_dir = NULL; 1683 dsl_dataset_drain_refs(ds, tag); 1684 VERIFY(0 == dmu_object_free(mos, obj, tx)); 1685 } 1686 1687 static int 1688 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1689 { 1690 uint64_t asize; 1691 1692 if (!dmu_tx_is_syncing(tx)) 1693 return (0); 1694 1695 /* 1696 * If there's an fs-only reservation, any blocks that might become 1697 * owned by the snapshot dataset must be accommodated by space 1698 * outside of the reservation. 1699 */ 1700 asize = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1701 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, FALSE)) 1702 return (ENOSPC); 1703 1704 /* 1705 * Propogate any reserved space for this snapshot to other 1706 * snapshot checks in this sync group. 1707 */ 1708 if (asize > 0) 1709 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1710 1711 return (0); 1712 } 1713 1714 /* ARGSUSED */ 1715 int 1716 dsl_dataset_snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 1717 { 1718 dsl_dataset_t *ds = arg1; 1719 const char *snapname = arg2; 1720 int err; 1721 uint64_t value; 1722 1723 /* 1724 * We don't allow multiple snapshots of the same txg. If there 1725 * is already one, try again. 1726 */ 1727 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 1728 return (EAGAIN); 1729 1730 /* 1731 * Check for conflicting name snapshot name. 1732 */ 1733 err = dsl_dataset_snap_lookup(ds, snapname, &value); 1734 if (err == 0) 1735 return (EEXIST); 1736 if (err != ENOENT) 1737 return (err); 1738 1739 /* 1740 * Check that the dataset's name is not too long. Name consists 1741 * of the dataset's length + 1 for the @-sign + snapshot name's length 1742 */ 1743 if (dsl_dataset_namelen(ds) + 1 + strlen(snapname) >= MAXNAMELEN) 1744 return (ENAMETOOLONG); 1745 1746 err = dsl_dataset_snapshot_reserve_space(ds, tx); 1747 if (err) 1748 return (err); 1749 1750 ds->ds_trysnap_txg = tx->tx_txg; 1751 return (0); 1752 } 1753 1754 void 1755 dsl_dataset_snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1756 { 1757 dsl_dataset_t *ds = arg1; 1758 const char *snapname = arg2; 1759 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1760 dmu_buf_t *dbuf; 1761 dsl_dataset_phys_t *dsphys; 1762 uint64_t dsobj; 1763 objset_t *mos = dp->dp_meta_objset; 1764 int err; 1765 1766 spa_scrub_restart(dp->dp_spa, tx->tx_txg); 1767 ASSERT(RW_WRITE_HELD(&dp->dp_config_rwlock)); 1768 1769 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1770 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1771 VERIFY(0 == dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1772 dmu_buf_will_dirty(dbuf, tx); 1773 dsphys = dbuf->db_data; 1774 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1775 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1776 dsphys->ds_fsid_guid = unique_create(); 1777 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1778 sizeof (dsphys->ds_guid)); 1779 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1780 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1781 dsphys->ds_next_snap_obj = ds->ds_object; 1782 dsphys->ds_num_children = 1; 1783 dsphys->ds_creation_time = gethrestime_sec(); 1784 dsphys->ds_creation_txg = tx->tx_txg; 1785 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1786 dsphys->ds_used_bytes = ds->ds_phys->ds_used_bytes; 1787 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1788 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1789 dsphys->ds_flags = ds->ds_phys->ds_flags; 1790 dsphys->ds_bp = ds->ds_phys->ds_bp; 1791 dmu_buf_rele(dbuf, FTAG); 1792 1793 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1794 if (ds->ds_prev) { 1795 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1796 ds->ds_object || 1797 ds->ds_prev->ds_phys->ds_num_children > 1); 1798 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1799 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1800 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1801 ds->ds_prev->ds_phys->ds_creation_txg); 1802 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1803 } 1804 } 1805 1806 /* 1807 * If we have a reference-reservation on this dataset, we will 1808 * need to increase the amount of refreservation being charged 1809 * since our unique space is going to zero. 1810 */ 1811 if (ds->ds_reserved) { 1812 int64_t add = MIN(dsl_dataset_unique(ds), ds->ds_reserved); 1813 dsl_dir_diduse_space(ds->ds_dir, add, 0, 0, tx); 1814 } 1815 1816 bplist_close(&ds->ds_deadlist); 1817 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1818 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1819 ds->ds_phys->ds_prev_snap_obj = dsobj; 1820 ds->ds_phys->ds_prev_snap_txg = tx->tx_txg; 1821 ds->ds_phys->ds_unique_bytes = 0; 1822 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1823 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1824 ds->ds_phys->ds_deadlist_obj = 1825 bplist_create(mos, DSL_DEADLIST_BLOCKSIZE, tx); 1826 VERIFY(0 == bplist_open(&ds->ds_deadlist, mos, 1827 ds->ds_phys->ds_deadlist_obj)); 1828 1829 dprintf("snap '%s' -> obj %llu\n", snapname, dsobj); 1830 err = zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1831 snapname, 8, 1, &dsobj, tx); 1832 ASSERT(err == 0); 1833 1834 if (ds->ds_prev) 1835 dsl_dataset_drop_ref(ds->ds_prev, ds); 1836 VERIFY(0 == dsl_dataset_get_ref(dp, 1837 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1838 1839 spa_history_internal_log(LOG_DS_SNAPSHOT, dp->dp_spa, tx, cr, 1840 "dataset = %llu", dsobj); 1841 } 1842 1843 void 1844 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1845 { 1846 ASSERT(dmu_tx_is_syncing(tx)); 1847 ASSERT(ds->ds_user_ptr != NULL); 1848 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1849 1850 /* 1851 * in case we had to change ds_fsid_guid when we opened it, 1852 * sync it out now. 1853 */ 1854 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1855 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1856 1857 dsl_dir_dirty(ds->ds_dir, tx); 1858 dmu_objset_sync(ds->ds_user_ptr, zio, tx); 1859 } 1860 1861 void 1862 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1863 { 1864 uint64_t refd, avail, uobjs, aobjs; 1865 1866 dsl_dir_stats(ds->ds_dir, nv); 1867 1868 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1870 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1871 1872 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1873 ds->ds_phys->ds_creation_time); 1874 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1875 ds->ds_phys->ds_creation_txg); 1876 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1877 ds->ds_quota); 1878 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1879 ds->ds_reserved); 1880 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1881 ds->ds_phys->ds_guid); 1882 1883 if (ds->ds_phys->ds_next_snap_obj) { 1884 /* 1885 * This is a snapshot; override the dd's space used with 1886 * our unique space and compression ratio. 1887 */ 1888 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1889 ds->ds_phys->ds_unique_bytes); 1890 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, 1891 ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1892 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1893 ds->ds_phys->ds_compressed_bytes)); 1894 } 1895 } 1896 1897 void 1898 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1899 { 1900 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1901 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1902 stat->dds_guid = ds->ds_phys->ds_guid; 1903 if (ds->ds_phys->ds_next_snap_obj) { 1904 stat->dds_is_snapshot = B_TRUE; 1905 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1906 } 1907 1908 /* clone origin is really a dsl_dir thing... */ 1909 rw_enter(&ds->ds_dir->dd_pool->dp_config_rwlock, RW_READER); 1910 if (ds->ds_dir->dd_phys->dd_origin_obj) { 1911 dsl_dataset_t *ods; 1912 1913 VERIFY(0 == dsl_dataset_get_ref(ds->ds_dir->dd_pool, 1914 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1915 dsl_dataset_name(ods, stat->dds_origin); 1916 dsl_dataset_drop_ref(ods, FTAG); 1917 } 1918 rw_exit(&ds->ds_dir->dd_pool->dp_config_rwlock); 1919 } 1920 1921 uint64_t 1922 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1923 { 1924 return (ds->ds_fsid_guid); 1925 } 1926 1927 void 1928 dsl_dataset_space(dsl_dataset_t *ds, 1929 uint64_t *refdbytesp, uint64_t *availbytesp, 1930 uint64_t *usedobjsp, uint64_t *availobjsp) 1931 { 1932 *refdbytesp = ds->ds_phys->ds_used_bytes; 1933 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1934 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1935 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1936 if (ds->ds_quota != 0) { 1937 /* 1938 * Adjust available bytes according to refquota 1939 */ 1940 if (*refdbytesp < ds->ds_quota) 1941 *availbytesp = MIN(*availbytesp, 1942 ds->ds_quota - *refdbytesp); 1943 else 1944 *availbytesp = 0; 1945 } 1946 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 1947 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1948 } 1949 1950 boolean_t 1951 dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) 1952 { 1953 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1954 1955 ASSERT(RW_LOCK_HELD(&dp->dp_config_rwlock) || 1956 dsl_pool_sync_context(dp)); 1957 if (ds->ds_prev == NULL) 1958 return (B_FALSE); 1959 if (ds->ds_phys->ds_bp.blk_birth > 1960 ds->ds_prev->ds_phys->ds_creation_txg) 1961 return (B_TRUE); 1962 return (B_FALSE); 1963 } 1964 1965 /* ARGSUSED */ 1966 static int 1967 dsl_dataset_snapshot_rename_check(void *arg1, void *arg2, dmu_tx_t *tx) 1968 { 1969 dsl_dataset_t *ds = arg1; 1970 char *newsnapname = arg2; 1971 dsl_dir_t *dd = ds->ds_dir; 1972 dsl_dataset_t *hds; 1973 uint64_t val; 1974 int err; 1975 1976 err = dsl_dataset_hold_obj(dd->dd_pool, 1977 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds); 1978 if (err) 1979 return (err); 1980 1981 /* new name better not be in use */ 1982 err = dsl_dataset_snap_lookup(hds, newsnapname, &val); 1983 dsl_dataset_rele(hds, FTAG); 1984 1985 if (err == 0) 1986 err = EEXIST; 1987 else if (err == ENOENT) 1988 err = 0; 1989 1990 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1991 if (dsl_dir_namelen(ds->ds_dir) + 1 + strlen(newsnapname) >= MAXNAMELEN) 1992 err = ENAMETOOLONG; 1993 1994 return (err); 1995 } 1996 1997 static void 1998 dsl_dataset_snapshot_rename_sync(void *arg1, void *arg2, 1999 cred_t *cr, dmu_tx_t *tx) 2000 { 2001 dsl_dataset_t *ds = arg1; 2002 const char *newsnapname = arg2; 2003 dsl_dir_t *dd = ds->ds_dir; 2004 objset_t *mos = dd->dd_pool->dp_meta_objset; 2005 dsl_dataset_t *hds; 2006 int err; 2007 2008 ASSERT(ds->ds_phys->ds_next_snap_obj != 0); 2009 2010 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, 2011 dd->dd_phys->dd_head_dataset_obj, FTAG, &hds)); 2012 2013 VERIFY(0 == dsl_dataset_get_snapname(ds)); 2014 err = dsl_dataset_snap_remove(hds, ds->ds_snapname, tx); 2015 ASSERT3U(err, ==, 0); 2016 mutex_enter(&ds->ds_lock); 2017 (void) strcpy(ds->ds_snapname, newsnapname); 2018 mutex_exit(&ds->ds_lock); 2019 err = zap_add(mos, hds->ds_phys->ds_snapnames_zapobj, 2020 ds->ds_snapname, 8, 1, &ds->ds_object, tx); 2021 ASSERT3U(err, ==, 0); 2022 2023 spa_history_internal_log(LOG_DS_RENAME, dd->dd_pool->dp_spa, tx, 2024 cr, "dataset = %llu", ds->ds_object); 2025 dsl_dataset_rele(hds, FTAG); 2026 } 2027 2028 struct renamesnaparg { 2029 dsl_sync_task_group_t *dstg; 2030 char failed[MAXPATHLEN]; 2031 char *oldsnap; 2032 char *newsnap; 2033 }; 2034 2035 static int 2036 dsl_snapshot_rename_one(char *name, void *arg) 2037 { 2038 struct renamesnaparg *ra = arg; 2039 dsl_dataset_t *ds = NULL; 2040 char *cp; 2041 int err; 2042 2043 cp = name + strlen(name); 2044 *cp = '@'; 2045 (void) strcpy(cp + 1, ra->oldsnap); 2046 2047 /* 2048 * For recursive snapshot renames the parent won't be changing 2049 * so we just pass name for both the to/from argument. 2050 */ 2051 if (err = zfs_secpolicy_rename_perms(name, name, CRED())) { 2052 (void) strcpy(ra->failed, name); 2053 return (err); 2054 } 2055 2056 #ifdef _KERNEL 2057 /* 2058 * For all filesystems undergoing rename, we'll need to unmount it. 2059 */ 2060 (void) zfs_unmount_snap(name, NULL); 2061 #endif 2062 err = dsl_dataset_hold(name, ra->dstg, &ds); 2063 *cp = '\0'; 2064 if (err == ENOENT) { 2065 return (0); 2066 } else if (err) { 2067 (void) strcpy(ra->failed, name); 2068 return (err); 2069 } 2070 2071 dsl_sync_task_create(ra->dstg, dsl_dataset_snapshot_rename_check, 2072 dsl_dataset_snapshot_rename_sync, ds, ra->newsnap, 0); 2073 2074 return (0); 2075 } 2076 2077 static int 2078 dsl_recursive_rename(char *oldname, const char *newname) 2079 { 2080 int err; 2081 struct renamesnaparg *ra; 2082 dsl_sync_task_t *dst; 2083 spa_t *spa; 2084 char *cp, *fsname = spa_strdup(oldname); 2085 int len = strlen(oldname); 2086 2087 /* truncate the snapshot name to get the fsname */ 2088 cp = strchr(fsname, '@'); 2089 *cp = '\0'; 2090 2091 err = spa_open(fsname, &spa, FTAG); 2092 if (err) { 2093 kmem_free(fsname, len + 1); 2094 return (err); 2095 } 2096 ra = kmem_alloc(sizeof (struct renamesnaparg), KM_SLEEP); 2097 ra->dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 2098 2099 ra->oldsnap = strchr(oldname, '@') + 1; 2100 ra->newsnap = strchr(newname, '@') + 1; 2101 *ra->failed = '\0'; 2102 2103 err = dmu_objset_find(fsname, dsl_snapshot_rename_one, ra, 2104 DS_FIND_CHILDREN); 2105 kmem_free(fsname, len + 1); 2106 2107 if (err == 0) { 2108 err = dsl_sync_task_group_wait(ra->dstg); 2109 } 2110 2111 for (dst = list_head(&ra->dstg->dstg_tasks); dst; 2112 dst = list_next(&ra->dstg->dstg_tasks, dst)) { 2113 dsl_dataset_t *ds = dst->dst_arg1; 2114 if (dst->dst_err) { 2115 dsl_dir_name(ds->ds_dir, ra->failed); 2116 (void) strcat(ra->failed, "@"); 2117 (void) strcat(ra->failed, ra->newsnap); 2118 } 2119 dsl_dataset_rele(ds, ra->dstg); 2120 } 2121 2122 if (err) 2123 (void) strcpy(oldname, ra->failed); 2124 2125 dsl_sync_task_group_destroy(ra->dstg); 2126 kmem_free(ra, sizeof (struct renamesnaparg)); 2127 spa_close(spa, FTAG); 2128 return (err); 2129 } 2130 2131 static int 2132 dsl_valid_rename(char *oldname, void *arg) 2133 { 2134 int delta = *(int *)arg; 2135 2136 if (strlen(oldname) + delta >= MAXNAMELEN) 2137 return (ENAMETOOLONG); 2138 2139 return (0); 2140 } 2141 2142 #pragma weak dmu_objset_rename = dsl_dataset_rename 2143 int 2144 dsl_dataset_rename(char *oldname, const char *newname, boolean_t recursive) 2145 { 2146 dsl_dir_t *dd; 2147 dsl_dataset_t *ds; 2148 const char *tail; 2149 int err; 2150 2151 err = dsl_dir_open(oldname, FTAG, &dd, &tail); 2152 if (err) 2153 return (err); 2154 if (tail == NULL) { 2155 int delta = strlen(newname) - strlen(oldname); 2156 2157 /* if we're growing, validate child size lengths */ 2158 if (delta > 0) 2159 err = dmu_objset_find(oldname, dsl_valid_rename, 2160 &delta, DS_FIND_CHILDREN | DS_FIND_SNAPSHOTS); 2161 2162 if (!err) 2163 err = dsl_dir_rename(dd, newname); 2164 dsl_dir_close(dd, FTAG); 2165 return (err); 2166 } 2167 if (tail[0] != '@') { 2168 /* the name ended in a nonexistant component */ 2169 dsl_dir_close(dd, FTAG); 2170 return (ENOENT); 2171 } 2172 2173 dsl_dir_close(dd, FTAG); 2174 2175 /* new name must be snapshot in same filesystem */ 2176 tail = strchr(newname, '@'); 2177 if (tail == NULL) 2178 return (EINVAL); 2179 tail++; 2180 if (strncmp(oldname, newname, tail - newname) != 0) 2181 return (EXDEV); 2182 2183 if (recursive) { 2184 err = dsl_recursive_rename(oldname, newname); 2185 } else { 2186 err = dsl_dataset_hold(oldname, FTAG, &ds); 2187 if (err) 2188 return (err); 2189 2190 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2191 dsl_dataset_snapshot_rename_check, 2192 dsl_dataset_snapshot_rename_sync, ds, (char *)tail, 1); 2193 2194 dsl_dataset_rele(ds, FTAG); 2195 } 2196 2197 return (err); 2198 } 2199 2200 struct promotedsarg { 2201 list_node_t link; 2202 dsl_dataset_t *ds; 2203 }; 2204 2205 struct promotearg { 2206 list_t snap_list; 2207 dsl_dataset_t *clone_origin, *old_head; 2208 uint64_t used, comp, uncomp, unique; 2209 uint64_t newnext_obj; 2210 }; 2211 2212 /* ARGSUSED */ 2213 static int 2214 dsl_dataset_promote_check(void *arg1, void *arg2, dmu_tx_t *tx) 2215 { 2216 dsl_dataset_t *hds = arg1; 2217 struct promotearg *pa = arg2; 2218 struct promotedsarg *snap = list_head(&pa->snap_list); 2219 dsl_pool_t *dp = hds->ds_dir->dd_pool; 2220 dsl_dataset_t *origin_ds = snap->ds; 2221 dsl_dataset_t *newnext_ds; 2222 char *name; 2223 uint64_t itor = 0; 2224 blkptr_t bp; 2225 int err; 2226 2227 /* Check that it is a clone */ 2228 if (hds->ds_dir->dd_phys->dd_origin_obj == 0) 2229 return (EINVAL); 2230 2231 /* Since this is so expensive, don't do the preliminary check */ 2232 if (!dmu_tx_is_syncing(tx)) 2233 return (0); 2234 2235 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) 2236 return (EXDEV); 2237 2238 /* find origin's new next ds */ 2239 newnext_ds = hds; 2240 while (newnext_ds->ds_phys->ds_prev_snap_obj != origin_ds->ds_object) { 2241 dsl_dataset_t *prev; 2242 2243 err = dsl_dataset_hold_obj(dp, 2244 newnext_ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 2245 if (newnext_ds != hds) 2246 dsl_dataset_rele(newnext_ds, FTAG); 2247 if (err) 2248 return (err); 2249 newnext_ds = prev; 2250 } 2251 pa->newnext_obj = newnext_ds->ds_object; 2252 2253 /* compute origin's new unique space */ 2254 pa->unique = 0; 2255 while ((err = bplist_iterate(&newnext_ds->ds_deadlist, 2256 &itor, &bp)) == 0) { 2257 if (bp.blk_birth > origin_ds->ds_phys->ds_prev_snap_txg) 2258 pa->unique += bp_get_dasize(dp->dp_spa, &bp); 2259 } 2260 if (newnext_ds != hds) 2261 dsl_dataset_rele(newnext_ds, FTAG); 2262 if (err != ENOENT) 2263 return (err); 2264 2265 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2266 2267 /* 2268 * Walk the snapshots that we are moving 2269 * 2270 * Compute space to transfer. Each snapshot gave birth to: 2271 * (my used) - (prev's used) + (deadlist's used) 2272 * So a sequence would look like: 2273 * uN - u(N-1) + dN + ... + u1 - u0 + d1 + u0 - 0 + d0 2274 * Which simplifies to: 2275 * uN + dN + ... + d1 + d0 2276 * Note however, if we stop before we reach the ORIGIN we get: 2277 * uN + dN + ... + dM - uM-1 2278 */ 2279 pa->used = origin_ds->ds_phys->ds_used_bytes; 2280 pa->comp = origin_ds->ds_phys->ds_compressed_bytes; 2281 pa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 2282 do { 2283 uint64_t val, dlused, dlcomp, dluncomp; 2284 dsl_dataset_t *ds = snap->ds; 2285 2286 /* Check that the snapshot name does not conflict */ 2287 dsl_dataset_name(ds, name); 2288 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2289 if (err == 0) 2290 err = EEXIST; 2291 if (err != ENOENT) 2292 break; 2293 err = 0; 2294 2295 /* The very first snapshot does not have a deadlist */ 2296 if (ds->ds_phys->ds_prev_snap_obj != 0) { 2297 if (err = bplist_space(&ds->ds_deadlist, 2298 &dlused, &dlcomp, &dluncomp)) 2299 break; 2300 pa->used += dlused; 2301 pa->comp += dlcomp; 2302 pa->uncomp += dluncomp; 2303 } 2304 } while (snap = list_next(&pa->snap_list, snap)); 2305 2306 /* 2307 * If we are a clone of a clone then we never reached ORIGIN, 2308 * so we need to subtract out the clone origin's used space. 2309 */ 2310 if (pa->clone_origin) { 2311 pa->used -= pa->clone_origin->ds_phys->ds_used_bytes; 2312 pa->comp -= pa->clone_origin->ds_phys->ds_compressed_bytes; 2313 pa->uncomp -= pa->clone_origin->ds_phys->ds_uncompressed_bytes; 2314 } 2315 2316 kmem_free(name, MAXPATHLEN); 2317 2318 /* Check that there is enough space here */ 2319 if (err == 0) { 2320 dsl_dir_t *odd = origin_ds->ds_dir; 2321 err = dsl_dir_transfer_possible(odd, hds->ds_dir, pa->used); 2322 } 2323 2324 return (err); 2325 } 2326 2327 static void 2328 dsl_dataset_promote_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2329 { 2330 dsl_dataset_t *hds = arg1; 2331 struct promotearg *pa = arg2; 2332 struct promotedsarg *snap = list_head(&pa->snap_list); 2333 dsl_dataset_t *origin_ds = snap->ds; 2334 dsl_dir_t *dd = hds->ds_dir; 2335 dsl_pool_t *dp = hds->ds_dir->dd_pool; 2336 dsl_dir_t *odd = NULL; 2337 char *name; 2338 2339 ASSERT(0 == (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE)); 2340 2341 /* 2342 * We need to explicitly open odd, since origin_ds's dd will be 2343 * changing. 2344 */ 2345 VERIFY(0 == dsl_dir_open_obj(dp, origin_ds->ds_dir->dd_object, 2346 NULL, FTAG, &odd)); 2347 2348 /* change origin's next snap */ 2349 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2350 origin_ds->ds_phys->ds_next_snap_obj = pa->newnext_obj; 2351 2352 /* change origin */ 2353 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2354 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 2355 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 2356 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2357 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 2358 2359 /* move snapshots to this dir */ 2360 name = kmem_alloc(MAXPATHLEN, KM_SLEEP); 2361 do { 2362 dsl_dataset_t *ds = snap->ds; 2363 2364 /* move snap name entry */ 2365 dsl_dataset_name(ds, name); 2366 VERIFY(0 == dsl_dataset_snap_remove(pa->old_head, 2367 ds->ds_snapname, tx)); 2368 VERIFY(0 == zap_add(dp->dp_meta_objset, 2369 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2370 8, 1, &ds->ds_object, tx)); 2371 2372 /* change containing dsl_dir */ 2373 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2374 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2375 ds->ds_phys->ds_dir_obj = dd->dd_object; 2376 ASSERT3P(ds->ds_dir, ==, odd); 2377 dsl_dir_close(ds->ds_dir, ds); 2378 VERIFY(0 == dsl_dir_open_obj(dp, dd->dd_object, 2379 NULL, ds, &ds->ds_dir)); 2380 2381 ASSERT3U(dsl_prop_numcb(ds), ==, 0); 2382 } while (snap = list_next(&pa->snap_list, snap)); 2383 2384 /* change space accounting */ 2385 dsl_dir_diduse_space(odd, -pa->used, -pa->comp, -pa->uncomp, tx); 2386 dsl_dir_diduse_space(dd, pa->used, pa->comp, pa->uncomp, tx); 2387 origin_ds->ds_phys->ds_unique_bytes = pa->unique; 2388 2389 /* log history record */ 2390 spa_history_internal_log(LOG_DS_PROMOTE, dd->dd_pool->dp_spa, tx, 2391 cr, "dataset = %llu", hds->ds_object); 2392 2393 dsl_dir_close(odd, FTAG); 2394 kmem_free(name, MAXPATHLEN); 2395 } 2396 2397 int 2398 dsl_dataset_promote(const char *name) 2399 { 2400 dsl_dataset_t *ds; 2401 dsl_dir_t *dd; 2402 dsl_pool_t *dp; 2403 dmu_object_info_t doi; 2404 struct promotearg pa; 2405 struct promotedsarg *snap; 2406 uint64_t snap_obj; 2407 uint64_t last_snap = 0; 2408 int err; 2409 2410 err = dsl_dataset_hold(name, FTAG, &ds); 2411 if (err) 2412 return (err); 2413 dd = ds->ds_dir; 2414 dp = dd->dd_pool; 2415 2416 err = dmu_object_info(dp->dp_meta_objset, 2417 ds->ds_phys->ds_snapnames_zapobj, &doi); 2418 if (err) { 2419 dsl_dataset_rele(ds, FTAG); 2420 return (err); 2421 } 2422 2423 /* 2424 * We are going to inherit all the snapshots taken before our 2425 * origin (i.e., our new origin will be our parent's origin). 2426 * Take ownership of them so that we can rename them into our 2427 * namespace. 2428 */ 2429 pa.clone_origin = NULL; 2430 list_create(&pa.snap_list, 2431 sizeof (struct promotedsarg), offsetof(struct promotedsarg, link)); 2432 rw_enter(&dp->dp_config_rwlock, RW_READER); 2433 ASSERT(dd->dd_phys->dd_origin_obj != 0); 2434 snap_obj = dd->dd_phys->dd_origin_obj; 2435 while (snap_obj) { 2436 snap = kmem_alloc(sizeof (struct promotedsarg), KM_SLEEP); 2437 err = dsl_dataset_own_obj(dp, snap_obj, 0, FTAG, &snap->ds); 2438 if (err == ENOENT) { 2439 /* lost race with snapshot destroy */ 2440 struct promotedsarg *last = list_tail(&pa.snap_list); 2441 ASSERT(snap_obj != last->ds->ds_phys->ds_prev_snap_obj); 2442 snap_obj = last->ds->ds_phys->ds_prev_snap_obj; 2443 kmem_free(snap, sizeof (struct promotedsarg)); 2444 continue; 2445 } else if (err) { 2446 kmem_free(snap, sizeof (struct promotedsarg)); 2447 rw_exit(&dp->dp_config_rwlock); 2448 goto out; 2449 } 2450 /* 2451 * We could be a clone of a clone. If we reach our 2452 * parent's branch point, we're done. 2453 */ 2454 if (last_snap && 2455 snap->ds->ds_phys->ds_next_snap_obj != last_snap) { 2456 pa.clone_origin = snap->ds; 2457 kmem_free(snap, sizeof (struct promotedsarg)); 2458 snap_obj = 0; 2459 } else { 2460 list_insert_tail(&pa.snap_list, snap); 2461 last_snap = snap_obj; 2462 snap_obj = snap->ds->ds_phys->ds_prev_snap_obj; 2463 } 2464 } 2465 snap = list_head(&pa.snap_list); 2466 ASSERT(snap != NULL); 2467 err = dsl_dataset_hold_obj(dp, 2468 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &pa.old_head); 2469 rw_exit(&dp->dp_config_rwlock); 2470 2471 if (err) 2472 goto out; 2473 2474 /* 2475 * Add in 128x the snapnames zapobj size, since we will be moving 2476 * a bunch of snapnames to the promoted ds, and dirtying their 2477 * bonus buffers. 2478 */ 2479 err = dsl_sync_task_do(dp, dsl_dataset_promote_check, 2480 dsl_dataset_promote_sync, ds, &pa, 2 + 2 * doi.doi_physical_blks); 2481 2482 dsl_dataset_rele(pa.old_head, FTAG); 2483 out: 2484 while ((snap = list_tail(&pa.snap_list)) != NULL) { 2485 list_remove(&pa.snap_list, snap); 2486 dsl_dataset_disown(snap->ds, FTAG); 2487 kmem_free(snap, sizeof (struct promotedsarg)); 2488 } 2489 list_destroy(&pa.snap_list); 2490 if (pa.clone_origin) 2491 dsl_dataset_disown(pa.clone_origin, FTAG); 2492 dsl_dataset_rele(ds, FTAG); 2493 return (err); 2494 } 2495 2496 struct cloneswaparg { 2497 dsl_dataset_t *cds; /* clone dataset */ 2498 dsl_dataset_t *ohds; /* origin's head dataset */ 2499 boolean_t force; 2500 int64_t unused_refres_delta; /* change in unconsumed refreservation */ 2501 }; 2502 2503 /* ARGSUSED */ 2504 static int 2505 dsl_dataset_clone_swap_check(void *arg1, void *arg2, dmu_tx_t *tx) 2506 { 2507 struct cloneswaparg *csa = arg1; 2508 2509 /* they should both be heads */ 2510 if (dsl_dataset_is_snapshot(csa->cds) || 2511 dsl_dataset_is_snapshot(csa->ohds)) 2512 return (EINVAL); 2513 2514 /* the branch point should be just before them */ 2515 if (csa->cds->ds_prev != csa->ohds->ds_prev) 2516 return (EINVAL); 2517 2518 /* cds should be the clone */ 2519 if (csa->cds->ds_prev->ds_phys->ds_next_snap_obj != 2520 csa->ohds->ds_object) 2521 return (EINVAL); 2522 2523 /* the clone should be a child of the origin */ 2524 if (csa->cds->ds_dir->dd_parent != csa->ohds->ds_dir) 2525 return (EINVAL); 2526 2527 /* ohds shouldn't be modified unless 'force' */ 2528 if (!csa->force && dsl_dataset_modified_since_lastsnap(csa->ohds)) 2529 return (ETXTBSY); 2530 2531 /* adjust amount of any unconsumed refreservation */ 2532 csa->unused_refres_delta = 2533 (int64_t)MIN(csa->ohds->ds_reserved, 2534 csa->ohds->ds_phys->ds_unique_bytes) - 2535 (int64_t)MIN(csa->ohds->ds_reserved, 2536 csa->cds->ds_phys->ds_unique_bytes); 2537 2538 if (csa->unused_refres_delta > 0 && 2539 csa->unused_refres_delta > 2540 dsl_dir_space_available(csa->ohds->ds_dir, NULL, 0, TRUE)) 2541 return (ENOSPC); 2542 2543 return (0); 2544 } 2545 2546 /* ARGSUSED */ 2547 static void 2548 dsl_dataset_clone_swap_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2549 { 2550 struct cloneswaparg *csa = arg1; 2551 dsl_pool_t *dp = csa->cds->ds_dir->dd_pool; 2552 uint64_t itor = 0; 2553 blkptr_t bp; 2554 uint64_t unique = 0; 2555 int err; 2556 2557 ASSERT(csa->cds->ds_reserved == 0); 2558 ASSERT(csa->cds->ds_quota == csa->ohds->ds_quota); 2559 2560 dmu_buf_will_dirty(csa->cds->ds_dbuf, tx); 2561 dmu_buf_will_dirty(csa->ohds->ds_dbuf, tx); 2562 dmu_buf_will_dirty(csa->cds->ds_prev->ds_dbuf, tx); 2563 2564 if (csa->cds->ds_user_ptr != NULL) { 2565 csa->cds->ds_user_evict_func(csa->cds, csa->cds->ds_user_ptr); 2566 csa->cds->ds_user_ptr = NULL; 2567 } 2568 2569 if (csa->ohds->ds_user_ptr != NULL) { 2570 csa->ohds->ds_user_evict_func(csa->ohds, 2571 csa->ohds->ds_user_ptr); 2572 csa->ohds->ds_user_ptr = NULL; 2573 } 2574 2575 /* compute unique space */ 2576 while ((err = bplist_iterate(&csa->cds->ds_deadlist, 2577 &itor, &bp)) == 0) { 2578 if (bp.blk_birth > csa->cds->ds_prev->ds_phys->ds_prev_snap_txg) 2579 unique += bp_get_dasize(dp->dp_spa, &bp); 2580 } 2581 VERIFY(err == ENOENT); 2582 2583 /* reset origin's unique bytes */ 2584 csa->cds->ds_prev->ds_phys->ds_unique_bytes = unique; 2585 2586 /* swap blkptrs */ 2587 { 2588 blkptr_t tmp; 2589 tmp = csa->ohds->ds_phys->ds_bp; 2590 csa->ohds->ds_phys->ds_bp = csa->cds->ds_phys->ds_bp; 2591 csa->cds->ds_phys->ds_bp = tmp; 2592 } 2593 2594 /* set dd_*_bytes */ 2595 { 2596 int64_t dused, dcomp, duncomp; 2597 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2598 uint64_t odl_used, odl_comp, odl_uncomp; 2599 2600 VERIFY(0 == bplist_space(&csa->cds->ds_deadlist, &cdl_used, 2601 &cdl_comp, &cdl_uncomp)); 2602 VERIFY(0 == bplist_space(&csa->ohds->ds_deadlist, &odl_used, 2603 &odl_comp, &odl_uncomp)); 2604 dused = csa->cds->ds_phys->ds_used_bytes + cdl_used - 2605 (csa->ohds->ds_phys->ds_used_bytes + odl_used); 2606 dcomp = csa->cds->ds_phys->ds_compressed_bytes + cdl_comp - 2607 (csa->ohds->ds_phys->ds_compressed_bytes + odl_comp); 2608 duncomp = csa->cds->ds_phys->ds_uncompressed_bytes + 2609 cdl_uncomp - 2610 (csa->ohds->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2611 2612 dsl_dir_diduse_space(csa->ohds->ds_dir, 2613 dused, dcomp, duncomp, tx); 2614 dsl_dir_diduse_space(csa->cds->ds_dir, 2615 -dused, -dcomp, -duncomp, tx); 2616 } 2617 2618 #define SWITCH64(x, y) \ 2619 { \ 2620 uint64_t __tmp = (x); \ 2621 (x) = (y); \ 2622 (y) = __tmp; \ 2623 } 2624 2625 /* swap ds_*_bytes */ 2626 SWITCH64(csa->ohds->ds_phys->ds_used_bytes, 2627 csa->cds->ds_phys->ds_used_bytes); 2628 SWITCH64(csa->ohds->ds_phys->ds_compressed_bytes, 2629 csa->cds->ds_phys->ds_compressed_bytes); 2630 SWITCH64(csa->ohds->ds_phys->ds_uncompressed_bytes, 2631 csa->cds->ds_phys->ds_uncompressed_bytes); 2632 SWITCH64(csa->ohds->ds_phys->ds_unique_bytes, 2633 csa->cds->ds_phys->ds_unique_bytes); 2634 2635 /* apply any parent delta for change in unconsumed refreservation */ 2636 dsl_dir_diduse_space(csa->ohds->ds_dir, csa->unused_refres_delta, 2637 0, 0, tx); 2638 2639 /* swap deadlists */ 2640 bplist_close(&csa->cds->ds_deadlist); 2641 bplist_close(&csa->ohds->ds_deadlist); 2642 SWITCH64(csa->ohds->ds_phys->ds_deadlist_obj, 2643 csa->cds->ds_phys->ds_deadlist_obj); 2644 VERIFY(0 == bplist_open(&csa->cds->ds_deadlist, dp->dp_meta_objset, 2645 csa->cds->ds_phys->ds_deadlist_obj)); 2646 VERIFY(0 == bplist_open(&csa->ohds->ds_deadlist, dp->dp_meta_objset, 2647 csa->ohds->ds_phys->ds_deadlist_obj)); 2648 } 2649 2650 /* 2651 * Swap 'clone' with its origin head file system. Used at the end 2652 * of "online recv" to swizzle the file system to the new version. 2653 */ 2654 int 2655 dsl_dataset_clone_swap(dsl_dataset_t *clone, dsl_dataset_t *origin_head, 2656 boolean_t force) 2657 { 2658 struct cloneswaparg csa; 2659 int error; 2660 2661 ASSERT(clone->ds_owner); 2662 ASSERT(origin_head->ds_owner); 2663 retry: 2664 /* Need exclusive access for the swap */ 2665 rw_enter(&clone->ds_rwlock, RW_WRITER); 2666 if (!rw_tryenter(&origin_head->ds_rwlock, RW_WRITER)) { 2667 rw_exit(&clone->ds_rwlock); 2668 rw_enter(&origin_head->ds_rwlock, RW_WRITER); 2669 if (!rw_tryenter(&clone->ds_rwlock, RW_WRITER)) { 2670 rw_exit(&origin_head->ds_rwlock); 2671 goto retry; 2672 } 2673 } 2674 csa.cds = clone; 2675 csa.ohds = origin_head; 2676 csa.force = force; 2677 error = dsl_sync_task_do(clone->ds_dir->dd_pool, 2678 dsl_dataset_clone_swap_check, 2679 dsl_dataset_clone_swap_sync, &csa, NULL, 9); 2680 return (error); 2681 } 2682 2683 /* 2684 * Given a pool name and a dataset object number in that pool, 2685 * return the name of that dataset. 2686 */ 2687 int 2688 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2689 { 2690 spa_t *spa; 2691 dsl_pool_t *dp; 2692 dsl_dataset_t *ds; 2693 int error; 2694 2695 if ((error = spa_open(pname, &spa, FTAG)) != 0) 2696 return (error); 2697 dp = spa_get_dsl(spa); 2698 rw_enter(&dp->dp_config_rwlock, RW_READER); 2699 if ((error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds)) == 0) { 2700 dsl_dataset_name(ds, buf); 2701 dsl_dataset_rele(ds, FTAG); 2702 } 2703 rw_exit(&dp->dp_config_rwlock); 2704 spa_close(spa, FTAG); 2705 2706 return (error); 2707 } 2708 2709 int 2710 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2711 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2712 { 2713 int error = 0; 2714 2715 ASSERT3S(asize, >, 0); 2716 2717 /* 2718 * *ref_rsrv is the portion of asize that will come from any 2719 * unconsumed refreservation space. 2720 */ 2721 *ref_rsrv = 0; 2722 2723 mutex_enter(&ds->ds_lock); 2724 /* 2725 * Make a space adjustment for reserved bytes. 2726 */ 2727 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2728 ASSERT3U(*used, >=, 2729 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2730 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2731 *ref_rsrv = 2732 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2733 } 2734 2735 if (!check_quota || ds->ds_quota == 0) { 2736 mutex_exit(&ds->ds_lock); 2737 return (0); 2738 } 2739 /* 2740 * If they are requesting more space, and our current estimate 2741 * is over quota, they get to try again unless the actual 2742 * on-disk is over quota and there are no pending changes (which 2743 * may free up space for us). 2744 */ 2745 if (ds->ds_phys->ds_used_bytes + inflight >= ds->ds_quota) { 2746 if (inflight > 0 || ds->ds_phys->ds_used_bytes < ds->ds_quota) 2747 error = ERESTART; 2748 else 2749 error = EDQUOT; 2750 } 2751 mutex_exit(&ds->ds_lock); 2752 2753 return (error); 2754 } 2755 2756 /* ARGSUSED */ 2757 static int 2758 dsl_dataset_set_quota_check(void *arg1, void *arg2, dmu_tx_t *tx) 2759 { 2760 dsl_dataset_t *ds = arg1; 2761 uint64_t *quotap = arg2; 2762 uint64_t new_quota = *quotap; 2763 2764 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < SPA_VERSION_REFQUOTA) 2765 return (ENOTSUP); 2766 2767 if (new_quota == 0) 2768 return (0); 2769 2770 if (new_quota < ds->ds_phys->ds_used_bytes || 2771 new_quota < ds->ds_reserved) 2772 return (ENOSPC); 2773 2774 return (0); 2775 } 2776 2777 /* ARGSUSED */ 2778 void 2779 dsl_dataset_set_quota_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 2780 { 2781 dsl_dataset_t *ds = arg1; 2782 uint64_t *quotap = arg2; 2783 uint64_t new_quota = *quotap; 2784 2785 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2786 2787 ds->ds_quota = new_quota; 2788 2789 dsl_prop_set_uint64_sync(ds->ds_dir, "refquota", new_quota, cr, tx); 2790 2791 spa_history_internal_log(LOG_DS_REFQUOTA, ds->ds_dir->dd_pool->dp_spa, 2792 tx, cr, "%lld dataset = %llu ", 2793 (longlong_t)new_quota, ds->ds_object); 2794 } 2795 2796 int 2797 dsl_dataset_set_quota(const char *dsname, uint64_t quota) 2798 { 2799 dsl_dataset_t *ds; 2800 int err; 2801 2802 err = dsl_dataset_hold(dsname, FTAG, &ds); 2803 if (err) 2804 return (err); 2805 2806 if (quota != ds->ds_quota) { 2807 /* 2808 * If someone removes a file, then tries to set the quota, we 2809 * want to make sure the file freeing takes effect. 2810 */ 2811 txg_wait_open(ds->ds_dir->dd_pool, 0); 2812 2813 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2814 dsl_dataset_set_quota_check, dsl_dataset_set_quota_sync, 2815 ds, "a, 0); 2816 } 2817 dsl_dataset_rele(ds, FTAG); 2818 return (err); 2819 } 2820 2821 static int 2822 dsl_dataset_set_reservation_check(void *arg1, void *arg2, dmu_tx_t *tx) 2823 { 2824 dsl_dataset_t *ds = arg1; 2825 uint64_t *reservationp = arg2; 2826 uint64_t new_reservation = *reservationp; 2827 int64_t delta; 2828 uint64_t unique; 2829 2830 if (new_reservation > INT64_MAX) 2831 return (EOVERFLOW); 2832 2833 if (spa_version(ds->ds_dir->dd_pool->dp_spa) < 2834 SPA_VERSION_REFRESERVATION) 2835 return (ENOTSUP); 2836 2837 if (dsl_dataset_is_snapshot(ds)) 2838 return (EINVAL); 2839 2840 /* 2841 * If we are doing the preliminary check in open context, the 2842 * space estimates may be inaccurate. 2843 */ 2844 if (!dmu_tx_is_syncing(tx)) 2845 return (0); 2846 2847 mutex_enter(&ds->ds_lock); 2848 unique = dsl_dataset_unique(ds); 2849 delta = MAX(unique, new_reservation) - MAX(unique, ds->ds_reserved); 2850 mutex_exit(&ds->ds_lock); 2851 2852 if (delta > 0 && 2853 delta > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 2854 return (ENOSPC); 2855 if (delta > 0 && ds->ds_quota > 0 && 2856 new_reservation > ds->ds_quota) 2857 return (ENOSPC); 2858 2859 return (0); 2860 } 2861 2862 /* ARGSUSED */ 2863 static void 2864 dsl_dataset_set_reservation_sync(void *arg1, void *arg2, cred_t *cr, 2865 dmu_tx_t *tx) 2866 { 2867 dsl_dataset_t *ds = arg1; 2868 uint64_t *reservationp = arg2; 2869 uint64_t new_reservation = *reservationp; 2870 uint64_t unique; 2871 int64_t delta; 2872 2873 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2874 2875 mutex_enter(&ds->ds_lock); 2876 unique = dsl_dataset_unique(ds); 2877 delta = MAX(0, (int64_t)(new_reservation - unique)) - 2878 MAX(0, (int64_t)(ds->ds_reserved - unique)); 2879 ds->ds_reserved = new_reservation; 2880 mutex_exit(&ds->ds_lock); 2881 2882 dsl_prop_set_uint64_sync(ds->ds_dir, "refreservation", 2883 new_reservation, cr, tx); 2884 2885 dsl_dir_diduse_space(ds->ds_dir, delta, 0, 0, tx); 2886 2887 spa_history_internal_log(LOG_DS_REFRESERV, 2888 ds->ds_dir->dd_pool->dp_spa, tx, cr, "%lld dataset = %llu", 2889 (longlong_t)new_reservation, 2890 ds->ds_dir->dd_phys->dd_head_dataset_obj); 2891 } 2892 2893 int 2894 dsl_dataset_set_reservation(const char *dsname, uint64_t reservation) 2895 { 2896 dsl_dataset_t *ds; 2897 int err; 2898 2899 err = dsl_dataset_hold(dsname, FTAG, &ds); 2900 if (err) 2901 return (err); 2902 2903 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 2904 dsl_dataset_set_reservation_check, 2905 dsl_dataset_set_reservation_sync, ds, &reservation, 0); 2906 dsl_dataset_rele(ds, FTAG); 2907 return (err); 2908 } 2909