1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2013 by Delphix. All rights reserved. 24 * Copyright (c) 2012, Joyent, Inc. All rights reserved. 25 */ 26 27 #include <sys/dmu_objset.h> 28 #include <sys/dsl_dataset.h> 29 #include <sys/dsl_dir.h> 30 #include <sys/dsl_prop.h> 31 #include <sys/dsl_synctask.h> 32 #include <sys/dmu_traverse.h> 33 #include <sys/dmu_impl.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/zfeature.h> 39 #include <sys/unique.h> 40 #include <sys/zfs_context.h> 41 #include <sys/zfs_ioctl.h> 42 #include <sys/spa.h> 43 #include <sys/zfs_znode.h> 44 #include <sys/zfs_onexit.h> 45 #include <sys/zvol.h> 46 #include <sys/dsl_scan.h> 47 #include <sys/dsl_deadlist.h> 48 #include <sys/dsl_destroy.h> 49 #include <sys/dsl_userhold.h> 50 51 #define SWITCH64(x, y) \ 52 { \ 53 uint64_t __tmp = (x); \ 54 (x) = (y); \ 55 (y) = __tmp; \ 56 } 57 58 #define DS_REF_MAX (1ULL << 62) 59 60 #define DSL_DEADLIST_BLOCKSIZE SPA_MAXBLOCKSIZE 61 62 /* 63 * Figure out how much of this delta should be propogated to the dsl_dir 64 * layer. If there's a refreservation, that space has already been 65 * partially accounted for in our ancestors. 66 */ 67 static int64_t 68 parent_delta(dsl_dataset_t *ds, int64_t delta) 69 { 70 uint64_t old_bytes, new_bytes; 71 72 if (ds->ds_reserved == 0) 73 return (delta); 74 75 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 76 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 77 78 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 79 return (new_bytes - old_bytes); 80 } 81 82 void 83 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 84 { 85 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 86 int compressed = BP_GET_PSIZE(bp); 87 int uncompressed = BP_GET_UCSIZE(bp); 88 int64_t delta; 89 90 dprintf_bp(bp, "ds=%p", ds); 91 92 ASSERT(dmu_tx_is_syncing(tx)); 93 /* It could have been compressed away to nothing */ 94 if (BP_IS_HOLE(bp)) 95 return; 96 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 97 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 98 if (ds == NULL) { 99 dsl_pool_mos_diduse_space(tx->tx_pool, 100 used, compressed, uncompressed); 101 return; 102 } 103 dmu_buf_will_dirty(ds->ds_dbuf, tx); 104 105 mutex_enter(&ds->ds_dir->dd_lock); 106 mutex_enter(&ds->ds_lock); 107 delta = parent_delta(ds, used); 108 ds->ds_phys->ds_referenced_bytes += used; 109 ds->ds_phys->ds_compressed_bytes += compressed; 110 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 111 ds->ds_phys->ds_unique_bytes += used; 112 mutex_exit(&ds->ds_lock); 113 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 114 compressed, uncompressed, tx); 115 dsl_dir_transfer_space(ds->ds_dir, used - delta, 116 DD_USED_REFRSRV, DD_USED_HEAD, tx); 117 mutex_exit(&ds->ds_dir->dd_lock); 118 } 119 120 int 121 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 122 boolean_t async) 123 { 124 if (BP_IS_HOLE(bp)) 125 return (0); 126 127 ASSERT(dmu_tx_is_syncing(tx)); 128 ASSERT(bp->blk_birth <= tx->tx_txg); 129 130 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 131 int compressed = BP_GET_PSIZE(bp); 132 int uncompressed = BP_GET_UCSIZE(bp); 133 134 ASSERT(used > 0); 135 if (ds == NULL) { 136 dsl_free(tx->tx_pool, tx->tx_txg, bp); 137 dsl_pool_mos_diduse_space(tx->tx_pool, 138 -used, -compressed, -uncompressed); 139 return (used); 140 } 141 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 142 143 ASSERT(!dsl_dataset_is_snapshot(ds)); 144 dmu_buf_will_dirty(ds->ds_dbuf, tx); 145 146 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 147 int64_t delta; 148 149 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 150 dsl_free(tx->tx_pool, tx->tx_txg, bp); 151 152 mutex_enter(&ds->ds_dir->dd_lock); 153 mutex_enter(&ds->ds_lock); 154 ASSERT(ds->ds_phys->ds_unique_bytes >= used || 155 !DS_UNIQUE_IS_ACCURATE(ds)); 156 delta = parent_delta(ds, -used); 157 ds->ds_phys->ds_unique_bytes -= used; 158 mutex_exit(&ds->ds_lock); 159 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 160 delta, -compressed, -uncompressed, tx); 161 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 162 DD_USED_REFRSRV, DD_USED_HEAD, tx); 163 mutex_exit(&ds->ds_dir->dd_lock); 164 } else { 165 dprintf_bp(bp, "putting on dead list: %s", ""); 166 if (async) { 167 /* 168 * We are here as part of zio's write done callback, 169 * which means we're a zio interrupt thread. We can't 170 * call dsl_deadlist_insert() now because it may block 171 * waiting for I/O. Instead, put bp on the deferred 172 * queue and let dsl_pool_sync() finish the job. 173 */ 174 bplist_append(&ds->ds_pending_deadlist, bp); 175 } else { 176 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 177 } 178 ASSERT3U(ds->ds_prev->ds_object, ==, 179 ds->ds_phys->ds_prev_snap_obj); 180 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 181 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 182 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 183 ds->ds_object && bp->blk_birth > 184 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 185 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 186 mutex_enter(&ds->ds_prev->ds_lock); 187 ds->ds_prev->ds_phys->ds_unique_bytes += used; 188 mutex_exit(&ds->ds_prev->ds_lock); 189 } 190 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 191 dsl_dir_transfer_space(ds->ds_dir, used, 192 DD_USED_HEAD, DD_USED_SNAP, tx); 193 } 194 } 195 mutex_enter(&ds->ds_lock); 196 ASSERT3U(ds->ds_phys->ds_referenced_bytes, >=, used); 197 ds->ds_phys->ds_referenced_bytes -= used; 198 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 199 ds->ds_phys->ds_compressed_bytes -= compressed; 200 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 201 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 202 mutex_exit(&ds->ds_lock); 203 204 return (used); 205 } 206 207 uint64_t 208 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 209 { 210 uint64_t trysnap = 0; 211 212 if (ds == NULL) 213 return (0); 214 /* 215 * The snapshot creation could fail, but that would cause an 216 * incorrect FALSE return, which would only result in an 217 * overestimation of the amount of space that an operation would 218 * consume, which is OK. 219 * 220 * There's also a small window where we could miss a pending 221 * snapshot, because we could set the sync task in the quiescing 222 * phase. So this should only be used as a guess. 223 */ 224 if (ds->ds_trysnap_txg > 225 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 226 trysnap = ds->ds_trysnap_txg; 227 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 228 } 229 230 boolean_t 231 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 232 uint64_t blk_birth) 233 { 234 if (blk_birth <= dsl_dataset_prev_snap_txg(ds)) 235 return (B_FALSE); 236 237 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 238 239 return (B_TRUE); 240 } 241 242 /* ARGSUSED */ 243 static void 244 dsl_dataset_evict(dmu_buf_t *db, void *dsv) 245 { 246 dsl_dataset_t *ds = dsv; 247 248 ASSERT(ds->ds_owner == NULL); 249 250 unique_remove(ds->ds_fsid_guid); 251 252 if (ds->ds_objset != NULL) 253 dmu_objset_evict(ds->ds_objset); 254 255 if (ds->ds_prev) { 256 dsl_dataset_rele(ds->ds_prev, ds); 257 ds->ds_prev = NULL; 258 } 259 260 bplist_destroy(&ds->ds_pending_deadlist); 261 if (ds->ds_phys->ds_deadlist_obj != 0) 262 dsl_deadlist_close(&ds->ds_deadlist); 263 if (ds->ds_dir) 264 dsl_dir_rele(ds->ds_dir, ds); 265 266 ASSERT(!list_link_active(&ds->ds_synced_link)); 267 268 mutex_destroy(&ds->ds_lock); 269 mutex_destroy(&ds->ds_opening_lock); 270 refcount_destroy(&ds->ds_longholds); 271 272 kmem_free(ds, sizeof (dsl_dataset_t)); 273 } 274 275 int 276 dsl_dataset_get_snapname(dsl_dataset_t *ds) 277 { 278 dsl_dataset_phys_t *headphys; 279 int err; 280 dmu_buf_t *headdbuf; 281 dsl_pool_t *dp = ds->ds_dir->dd_pool; 282 objset_t *mos = dp->dp_meta_objset; 283 284 if (ds->ds_snapname[0]) 285 return (0); 286 if (ds->ds_phys->ds_next_snap_obj == 0) 287 return (0); 288 289 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 290 FTAG, &headdbuf); 291 if (err != 0) 292 return (err); 293 headphys = headdbuf->db_data; 294 err = zap_value_search(dp->dp_meta_objset, 295 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 296 dmu_buf_rele(headdbuf, FTAG); 297 return (err); 298 } 299 300 int 301 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 302 { 303 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 304 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 305 matchtype_t mt; 306 int err; 307 308 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 309 mt = MT_FIRST; 310 else 311 mt = MT_EXACT; 312 313 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 314 value, mt, NULL, 0, NULL); 315 if (err == ENOTSUP && mt == MT_FIRST) 316 err = zap_lookup(mos, snapobj, name, 8, 1, value); 317 return (err); 318 } 319 320 int 321 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx) 322 { 323 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 324 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 325 matchtype_t mt; 326 int err; 327 328 dsl_dir_snap_cmtime_update(ds->ds_dir); 329 330 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 331 mt = MT_FIRST; 332 else 333 mt = MT_EXACT; 334 335 err = zap_remove_norm(mos, snapobj, name, mt, tx); 336 if (err == ENOTSUP && mt == MT_FIRST) 337 err = zap_remove(mos, snapobj, name, tx); 338 return (err); 339 } 340 341 int 342 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 343 dsl_dataset_t **dsp) 344 { 345 objset_t *mos = dp->dp_meta_objset; 346 dmu_buf_t *dbuf; 347 dsl_dataset_t *ds; 348 int err; 349 dmu_object_info_t doi; 350 351 ASSERT(dsl_pool_config_held(dp)); 352 353 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 354 if (err != 0) 355 return (err); 356 357 /* Make sure dsobj has the correct object type. */ 358 dmu_object_info_from_db(dbuf, &doi); 359 if (doi.doi_type != DMU_OT_DSL_DATASET) { 360 dmu_buf_rele(dbuf, tag); 361 return (SET_ERROR(EINVAL)); 362 } 363 364 ds = dmu_buf_get_user(dbuf); 365 if (ds == NULL) { 366 dsl_dataset_t *winner = NULL; 367 368 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 369 ds->ds_dbuf = dbuf; 370 ds->ds_object = dsobj; 371 ds->ds_phys = dbuf->db_data; 372 373 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 374 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 375 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 376 refcount_create(&ds->ds_longholds); 377 378 bplist_create(&ds->ds_pending_deadlist); 379 dsl_deadlist_open(&ds->ds_deadlist, 380 mos, ds->ds_phys->ds_deadlist_obj); 381 382 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 383 offsetof(dmu_sendarg_t, dsa_link)); 384 385 if (err == 0) { 386 err = dsl_dir_hold_obj(dp, 387 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 388 } 389 if (err != 0) { 390 mutex_destroy(&ds->ds_lock); 391 mutex_destroy(&ds->ds_opening_lock); 392 refcount_destroy(&ds->ds_longholds); 393 bplist_destroy(&ds->ds_pending_deadlist); 394 dsl_deadlist_close(&ds->ds_deadlist); 395 kmem_free(ds, sizeof (dsl_dataset_t)); 396 dmu_buf_rele(dbuf, tag); 397 return (err); 398 } 399 400 if (!dsl_dataset_is_snapshot(ds)) { 401 ds->ds_snapname[0] = '\0'; 402 if (ds->ds_phys->ds_prev_snap_obj != 0) { 403 err = dsl_dataset_hold_obj(dp, 404 ds->ds_phys->ds_prev_snap_obj, 405 ds, &ds->ds_prev); 406 } 407 } else { 408 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 409 err = dsl_dataset_get_snapname(ds); 410 if (err == 0 && ds->ds_phys->ds_userrefs_obj != 0) { 411 err = zap_count( 412 ds->ds_dir->dd_pool->dp_meta_objset, 413 ds->ds_phys->ds_userrefs_obj, 414 &ds->ds_userrefs); 415 } 416 } 417 418 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 419 err = dsl_prop_get_int_ds(ds, 420 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 421 &ds->ds_reserved); 422 if (err == 0) { 423 err = dsl_prop_get_int_ds(ds, 424 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 425 &ds->ds_quota); 426 } 427 } else { 428 ds->ds_reserved = ds->ds_quota = 0; 429 } 430 431 if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds, 432 &ds->ds_phys, dsl_dataset_evict)) != NULL) { 433 bplist_destroy(&ds->ds_pending_deadlist); 434 dsl_deadlist_close(&ds->ds_deadlist); 435 if (ds->ds_prev) 436 dsl_dataset_rele(ds->ds_prev, ds); 437 dsl_dir_rele(ds->ds_dir, ds); 438 mutex_destroy(&ds->ds_lock); 439 mutex_destroy(&ds->ds_opening_lock); 440 refcount_destroy(&ds->ds_longholds); 441 kmem_free(ds, sizeof (dsl_dataset_t)); 442 if (err != 0) { 443 dmu_buf_rele(dbuf, tag); 444 return (err); 445 } 446 ds = winner; 447 } else { 448 ds->ds_fsid_guid = 449 unique_insert(ds->ds_phys->ds_fsid_guid); 450 } 451 } 452 ASSERT3P(ds->ds_dbuf, ==, dbuf); 453 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 454 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || 455 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 456 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 457 *dsp = ds; 458 return (0); 459 } 460 461 int 462 dsl_dataset_hold(dsl_pool_t *dp, const char *name, 463 void *tag, dsl_dataset_t **dsp) 464 { 465 dsl_dir_t *dd; 466 const char *snapname; 467 uint64_t obj; 468 int err = 0; 469 470 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 471 if (err != 0) 472 return (err); 473 474 ASSERT(dsl_pool_config_held(dp)); 475 obj = dd->dd_phys->dd_head_dataset_obj; 476 if (obj != 0) 477 err = dsl_dataset_hold_obj(dp, obj, tag, dsp); 478 else 479 err = SET_ERROR(ENOENT); 480 481 /* we may be looking for a snapshot */ 482 if (err == 0 && snapname != NULL) { 483 dsl_dataset_t *ds; 484 485 if (*snapname++ != '@') { 486 dsl_dataset_rele(*dsp, tag); 487 dsl_dir_rele(dd, FTAG); 488 return (SET_ERROR(ENOENT)); 489 } 490 491 dprintf("looking for snapshot '%s'\n", snapname); 492 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 493 if (err == 0) 494 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 495 dsl_dataset_rele(*dsp, tag); 496 497 if (err == 0) { 498 mutex_enter(&ds->ds_lock); 499 if (ds->ds_snapname[0] == 0) 500 (void) strlcpy(ds->ds_snapname, snapname, 501 sizeof (ds->ds_snapname)); 502 mutex_exit(&ds->ds_lock); 503 *dsp = ds; 504 } 505 } 506 507 dsl_dir_rele(dd, FTAG); 508 return (err); 509 } 510 511 int 512 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 513 void *tag, dsl_dataset_t **dsp) 514 { 515 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 516 if (err != 0) 517 return (err); 518 if (!dsl_dataset_tryown(*dsp, tag)) { 519 dsl_dataset_rele(*dsp, tag); 520 *dsp = NULL; 521 return (SET_ERROR(EBUSY)); 522 } 523 return (0); 524 } 525 526 int 527 dsl_dataset_own(dsl_pool_t *dp, const char *name, 528 void *tag, dsl_dataset_t **dsp) 529 { 530 int err = dsl_dataset_hold(dp, name, tag, dsp); 531 if (err != 0) 532 return (err); 533 if (!dsl_dataset_tryown(*dsp, tag)) { 534 dsl_dataset_rele(*dsp, tag); 535 return (SET_ERROR(EBUSY)); 536 } 537 return (0); 538 } 539 540 /* 541 * See the comment above dsl_pool_hold() for details. In summary, a long 542 * hold is used to prevent destruction of a dataset while the pool hold 543 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 544 * 545 * The dataset and pool must be held when this function is called. After it 546 * is called, the pool hold may be released while the dataset is still held 547 * and accessed. 548 */ 549 void 550 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 551 { 552 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 553 (void) refcount_add(&ds->ds_longholds, tag); 554 } 555 556 void 557 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 558 { 559 (void) refcount_remove(&ds->ds_longholds, tag); 560 } 561 562 /* Return B_TRUE if there are any long holds on this dataset. */ 563 boolean_t 564 dsl_dataset_long_held(dsl_dataset_t *ds) 565 { 566 return (!refcount_is_zero(&ds->ds_longholds)); 567 } 568 569 void 570 dsl_dataset_name(dsl_dataset_t *ds, char *name) 571 { 572 if (ds == NULL) { 573 (void) strcpy(name, "mos"); 574 } else { 575 dsl_dir_name(ds->ds_dir, name); 576 VERIFY0(dsl_dataset_get_snapname(ds)); 577 if (ds->ds_snapname[0]) { 578 (void) strcat(name, "@"); 579 /* 580 * We use a "recursive" mutex so that we 581 * can call dprintf_ds() with ds_lock held. 582 */ 583 if (!MUTEX_HELD(&ds->ds_lock)) { 584 mutex_enter(&ds->ds_lock); 585 (void) strcat(name, ds->ds_snapname); 586 mutex_exit(&ds->ds_lock); 587 } else { 588 (void) strcat(name, ds->ds_snapname); 589 } 590 } 591 } 592 } 593 594 static int 595 dsl_dataset_namelen(dsl_dataset_t *ds) 596 { 597 int result; 598 599 if (ds == NULL) { 600 result = 3; /* "mos" */ 601 } else { 602 result = dsl_dir_namelen(ds->ds_dir); 603 VERIFY0(dsl_dataset_get_snapname(ds)); 604 if (ds->ds_snapname[0]) { 605 ++result; /* adding one for the @-sign */ 606 if (!MUTEX_HELD(&ds->ds_lock)) { 607 mutex_enter(&ds->ds_lock); 608 result += strlen(ds->ds_snapname); 609 mutex_exit(&ds->ds_lock); 610 } else { 611 result += strlen(ds->ds_snapname); 612 } 613 } 614 } 615 616 return (result); 617 } 618 619 void 620 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 621 { 622 dmu_buf_rele(ds->ds_dbuf, tag); 623 } 624 625 void 626 dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 627 { 628 ASSERT(ds->ds_owner == tag && ds->ds_dbuf != NULL); 629 630 mutex_enter(&ds->ds_lock); 631 ds->ds_owner = NULL; 632 mutex_exit(&ds->ds_lock); 633 dsl_dataset_long_rele(ds, tag); 634 if (ds->ds_dbuf != NULL) 635 dsl_dataset_rele(ds, tag); 636 else 637 dsl_dataset_evict(NULL, ds); 638 } 639 640 boolean_t 641 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 642 { 643 boolean_t gotit = FALSE; 644 645 mutex_enter(&ds->ds_lock); 646 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 647 ds->ds_owner = tag; 648 dsl_dataset_long_hold(ds, tag); 649 gotit = TRUE; 650 } 651 mutex_exit(&ds->ds_lock); 652 return (gotit); 653 } 654 655 uint64_t 656 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 657 uint64_t flags, dmu_tx_t *tx) 658 { 659 dsl_pool_t *dp = dd->dd_pool; 660 dmu_buf_t *dbuf; 661 dsl_dataset_phys_t *dsphys; 662 uint64_t dsobj; 663 objset_t *mos = dp->dp_meta_objset; 664 665 if (origin == NULL) 666 origin = dp->dp_origin_snap; 667 668 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 669 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 670 ASSERT(dmu_tx_is_syncing(tx)); 671 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 672 673 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 674 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 675 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 676 dmu_buf_will_dirty(dbuf, tx); 677 dsphys = dbuf->db_data; 678 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 679 dsphys->ds_dir_obj = dd->dd_object; 680 dsphys->ds_flags = flags; 681 dsphys->ds_fsid_guid = unique_create(); 682 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 683 sizeof (dsphys->ds_guid)); 684 dsphys->ds_snapnames_zapobj = 685 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 686 DMU_OT_NONE, 0, tx); 687 dsphys->ds_creation_time = gethrestime_sec(); 688 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 689 690 if (origin == NULL) { 691 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 692 } else { 693 dsl_dataset_t *ohds; /* head of the origin snapshot */ 694 695 dsphys->ds_prev_snap_obj = origin->ds_object; 696 dsphys->ds_prev_snap_txg = 697 origin->ds_phys->ds_creation_txg; 698 dsphys->ds_referenced_bytes = 699 origin->ds_phys->ds_referenced_bytes; 700 dsphys->ds_compressed_bytes = 701 origin->ds_phys->ds_compressed_bytes; 702 dsphys->ds_uncompressed_bytes = 703 origin->ds_phys->ds_uncompressed_bytes; 704 dsphys->ds_bp = origin->ds_phys->ds_bp; 705 dsphys->ds_flags |= origin->ds_phys->ds_flags; 706 707 dmu_buf_will_dirty(origin->ds_dbuf, tx); 708 origin->ds_phys->ds_num_children++; 709 710 VERIFY0(dsl_dataset_hold_obj(dp, 711 origin->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ohds)); 712 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 713 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 714 dsl_dataset_rele(ohds, FTAG); 715 716 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 717 if (origin->ds_phys->ds_next_clones_obj == 0) { 718 origin->ds_phys->ds_next_clones_obj = 719 zap_create(mos, 720 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 721 } 722 VERIFY0(zap_add_int(mos, 723 origin->ds_phys->ds_next_clones_obj, dsobj, tx)); 724 } 725 726 dmu_buf_will_dirty(dd->dd_dbuf, tx); 727 dd->dd_phys->dd_origin_obj = origin->ds_object; 728 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 729 if (origin->ds_dir->dd_phys->dd_clones == 0) { 730 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 731 origin->ds_dir->dd_phys->dd_clones = 732 zap_create(mos, 733 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 734 } 735 VERIFY0(zap_add_int(mos, 736 origin->ds_dir->dd_phys->dd_clones, dsobj, tx)); 737 } 738 } 739 740 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 741 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 742 743 dmu_buf_rele(dbuf, FTAG); 744 745 dmu_buf_will_dirty(dd->dd_dbuf, tx); 746 dd->dd_phys->dd_head_dataset_obj = dsobj; 747 748 return (dsobj); 749 } 750 751 static void 752 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 753 { 754 objset_t *os; 755 756 VERIFY0(dmu_objset_from_ds(ds, &os)); 757 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 758 dsl_dataset_dirty(ds, tx); 759 } 760 761 uint64_t 762 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 763 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 764 { 765 dsl_pool_t *dp = pdd->dd_pool; 766 uint64_t dsobj, ddobj; 767 dsl_dir_t *dd; 768 769 ASSERT(dmu_tx_is_syncing(tx)); 770 ASSERT(lastname[0] != '@'); 771 772 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 773 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 774 775 dsobj = dsl_dataset_create_sync_dd(dd, origin, 776 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 777 778 dsl_deleg_set_create_perms(dd, tx, cr); 779 780 dsl_dir_rele(dd, FTAG); 781 782 /* 783 * If we are creating a clone, make sure we zero out any stale 784 * data from the origin snapshots zil header. 785 */ 786 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 787 dsl_dataset_t *ds; 788 789 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 790 dsl_dataset_zero_zil(ds, tx); 791 dsl_dataset_rele(ds, FTAG); 792 } 793 794 return (dsobj); 795 } 796 797 /* 798 * The unique space in the head dataset can be calculated by subtracting 799 * the space used in the most recent snapshot, that is still being used 800 * in this file system, from the space currently in use. To figure out 801 * the space in the most recent snapshot still in use, we need to take 802 * the total space used in the snapshot and subtract out the space that 803 * has been freed up since the snapshot was taken. 804 */ 805 void 806 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 807 { 808 uint64_t mrs_used; 809 uint64_t dlused, dlcomp, dluncomp; 810 811 ASSERT(!dsl_dataset_is_snapshot(ds)); 812 813 if (ds->ds_phys->ds_prev_snap_obj != 0) 814 mrs_used = ds->ds_prev->ds_phys->ds_referenced_bytes; 815 else 816 mrs_used = 0; 817 818 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 819 820 ASSERT3U(dlused, <=, mrs_used); 821 ds->ds_phys->ds_unique_bytes = 822 ds->ds_phys->ds_referenced_bytes - (mrs_used - dlused); 823 824 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 825 SPA_VERSION_UNIQUE_ACCURATE) 826 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 827 } 828 829 void 830 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 831 dmu_tx_t *tx) 832 { 833 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 834 uint64_t count; 835 int err; 836 837 ASSERT(ds->ds_phys->ds_num_children >= 2); 838 err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx); 839 /* 840 * The err should not be ENOENT, but a bug in a previous version 841 * of the code could cause upgrade_clones_cb() to not set 842 * ds_next_snap_obj when it should, leading to a missing entry. 843 * If we knew that the pool was created after 844 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 845 * ENOENT. However, at least we can check that we don't have 846 * too many entries in the next_clones_obj even after failing to 847 * remove this one. 848 */ 849 if (err != ENOENT) 850 VERIFY0(err); 851 ASSERT0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 852 &count)); 853 ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2); 854 } 855 856 857 blkptr_t * 858 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 859 { 860 return (&ds->ds_phys->ds_bp); 861 } 862 863 void 864 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 865 { 866 ASSERT(dmu_tx_is_syncing(tx)); 867 /* If it's the meta-objset, set dp_meta_rootbp */ 868 if (ds == NULL) { 869 tx->tx_pool->dp_meta_rootbp = *bp; 870 } else { 871 dmu_buf_will_dirty(ds->ds_dbuf, tx); 872 ds->ds_phys->ds_bp = *bp; 873 } 874 } 875 876 spa_t * 877 dsl_dataset_get_spa(dsl_dataset_t *ds) 878 { 879 return (ds->ds_dir->dd_pool->dp_spa); 880 } 881 882 void 883 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 884 { 885 dsl_pool_t *dp; 886 887 if (ds == NULL) /* this is the meta-objset */ 888 return; 889 890 ASSERT(ds->ds_objset != NULL); 891 892 if (ds->ds_phys->ds_next_snap_obj != 0) 893 panic("dirtying snapshot!"); 894 895 dp = ds->ds_dir->dd_pool; 896 897 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 898 /* up the hold count until we can be written out */ 899 dmu_buf_add_ref(ds->ds_dbuf, ds); 900 } 901 } 902 903 boolean_t 904 dsl_dataset_is_dirty(dsl_dataset_t *ds) 905 { 906 for (int t = 0; t < TXG_SIZE; t++) { 907 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 908 ds, t)) 909 return (B_TRUE); 910 } 911 return (B_FALSE); 912 } 913 914 static int 915 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 916 { 917 uint64_t asize; 918 919 if (!dmu_tx_is_syncing(tx)) 920 return (0); 921 922 /* 923 * If there's an fs-only reservation, any blocks that might become 924 * owned by the snapshot dataset must be accommodated by space 925 * outside of the reservation. 926 */ 927 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 928 asize = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 929 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 930 return (SET_ERROR(ENOSPC)); 931 932 /* 933 * Propagate any reserved space for this snapshot to other 934 * snapshot checks in this sync group. 935 */ 936 if (asize > 0) 937 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 938 939 return (0); 940 } 941 942 typedef struct dsl_dataset_snapshot_arg { 943 nvlist_t *ddsa_snaps; 944 nvlist_t *ddsa_props; 945 nvlist_t *ddsa_errors; 946 } dsl_dataset_snapshot_arg_t; 947 948 int 949 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 950 dmu_tx_t *tx) 951 { 952 int error; 953 uint64_t value; 954 955 ds->ds_trysnap_txg = tx->tx_txg; 956 957 if (!dmu_tx_is_syncing(tx)) 958 return (0); 959 960 /* 961 * We don't allow multiple snapshots of the same txg. If there 962 * is already one, try again. 963 */ 964 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 965 return (SET_ERROR(EAGAIN)); 966 967 /* 968 * Check for conflicting snapshot name. 969 */ 970 error = dsl_dataset_snap_lookup(ds, snapname, &value); 971 if (error == 0) 972 return (SET_ERROR(EEXIST)); 973 if (error != ENOENT) 974 return (error); 975 976 error = dsl_dataset_snapshot_reserve_space(ds, tx); 977 if (error != 0) 978 return (error); 979 980 return (0); 981 } 982 983 static int 984 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 985 { 986 dsl_dataset_snapshot_arg_t *ddsa = arg; 987 dsl_pool_t *dp = dmu_tx_pool(tx); 988 nvpair_t *pair; 989 int rv = 0; 990 991 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 992 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 993 int error = 0; 994 dsl_dataset_t *ds; 995 char *name, *atp; 996 char dsname[MAXNAMELEN]; 997 998 name = nvpair_name(pair); 999 if (strlen(name) >= MAXNAMELEN) 1000 error = SET_ERROR(ENAMETOOLONG); 1001 if (error == 0) { 1002 atp = strchr(name, '@'); 1003 if (atp == NULL) 1004 error = SET_ERROR(EINVAL); 1005 if (error == 0) 1006 (void) strlcpy(dsname, name, atp - name + 1); 1007 } 1008 if (error == 0) 1009 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1010 if (error == 0) { 1011 error = dsl_dataset_snapshot_check_impl(ds, 1012 atp + 1, tx); 1013 dsl_dataset_rele(ds, FTAG); 1014 } 1015 1016 if (error != 0) { 1017 if (ddsa->ddsa_errors != NULL) { 1018 fnvlist_add_int32(ddsa->ddsa_errors, 1019 name, error); 1020 } 1021 rv = error; 1022 } 1023 } 1024 return (rv); 1025 } 1026 1027 void 1028 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1029 dmu_tx_t *tx) 1030 { 1031 static zil_header_t zero_zil; 1032 1033 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1034 dmu_buf_t *dbuf; 1035 dsl_dataset_phys_t *dsphys; 1036 uint64_t dsobj, crtxg; 1037 objset_t *mos = dp->dp_meta_objset; 1038 objset_t *os; 1039 1040 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1041 1042 /* 1043 * If we are on an old pool, the zil must not be active, in which 1044 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1045 */ 1046 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1047 dmu_objset_from_ds(ds, &os) != 0 || 1048 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1049 sizeof (zero_zil)) == 0); 1050 1051 1052 /* 1053 * The origin's ds_creation_txg has to be < TXG_INITIAL 1054 */ 1055 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1056 crtxg = 1; 1057 else 1058 crtxg = tx->tx_txg; 1059 1060 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1061 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1062 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1063 dmu_buf_will_dirty(dbuf, tx); 1064 dsphys = dbuf->db_data; 1065 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1066 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1067 dsphys->ds_fsid_guid = unique_create(); 1068 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1069 sizeof (dsphys->ds_guid)); 1070 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1071 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1072 dsphys->ds_next_snap_obj = ds->ds_object; 1073 dsphys->ds_num_children = 1; 1074 dsphys->ds_creation_time = gethrestime_sec(); 1075 dsphys->ds_creation_txg = crtxg; 1076 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1077 dsphys->ds_referenced_bytes = ds->ds_phys->ds_referenced_bytes; 1078 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1079 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1080 dsphys->ds_flags = ds->ds_phys->ds_flags; 1081 dsphys->ds_bp = ds->ds_phys->ds_bp; 1082 dmu_buf_rele(dbuf, FTAG); 1083 1084 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1085 if (ds->ds_prev) { 1086 uint64_t next_clones_obj = 1087 ds->ds_prev->ds_phys->ds_next_clones_obj; 1088 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1089 ds->ds_object || 1090 ds->ds_prev->ds_phys->ds_num_children > 1); 1091 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1092 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1093 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1094 ds->ds_prev->ds_phys->ds_creation_txg); 1095 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1096 } else if (next_clones_obj != 0) { 1097 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1098 dsphys->ds_next_snap_obj, tx); 1099 VERIFY0(zap_add_int(mos, 1100 next_clones_obj, dsobj, tx)); 1101 } 1102 } 1103 1104 /* 1105 * If we have a reference-reservation on this dataset, we will 1106 * need to increase the amount of refreservation being charged 1107 * since our unique space is going to zero. 1108 */ 1109 if (ds->ds_reserved) { 1110 int64_t delta; 1111 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1112 delta = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 1113 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1114 delta, 0, 0, tx); 1115 } 1116 1117 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1118 ds->ds_phys->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist, 1119 UINT64_MAX, ds->ds_phys->ds_prev_snap_obj, tx); 1120 dsl_deadlist_close(&ds->ds_deadlist); 1121 dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj); 1122 dsl_deadlist_add_key(&ds->ds_deadlist, 1123 ds->ds_phys->ds_prev_snap_txg, tx); 1124 1125 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1126 ds->ds_phys->ds_prev_snap_obj = dsobj; 1127 ds->ds_phys->ds_prev_snap_txg = crtxg; 1128 ds->ds_phys->ds_unique_bytes = 0; 1129 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1130 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1131 1132 VERIFY0(zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1133 snapname, 8, 1, &dsobj, tx)); 1134 1135 if (ds->ds_prev) 1136 dsl_dataset_rele(ds->ds_prev, ds); 1137 VERIFY0(dsl_dataset_hold_obj(dp, 1138 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1139 1140 dsl_scan_ds_snapshotted(ds, tx); 1141 1142 dsl_dir_snap_cmtime_update(ds->ds_dir); 1143 1144 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1145 } 1146 1147 static void 1148 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1149 { 1150 dsl_dataset_snapshot_arg_t *ddsa = arg; 1151 dsl_pool_t *dp = dmu_tx_pool(tx); 1152 nvpair_t *pair; 1153 1154 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1155 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1156 dsl_dataset_t *ds; 1157 char *name, *atp; 1158 char dsname[MAXNAMELEN]; 1159 1160 name = nvpair_name(pair); 1161 atp = strchr(name, '@'); 1162 (void) strlcpy(dsname, name, atp - name + 1); 1163 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1164 1165 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1166 if (ddsa->ddsa_props != NULL) { 1167 dsl_props_set_sync_impl(ds->ds_prev, 1168 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1169 } 1170 dsl_dataset_rele(ds, FTAG); 1171 } 1172 } 1173 1174 /* 1175 * The snapshots must all be in the same pool. 1176 * All-or-nothing: if there are any failures, nothing will be modified. 1177 */ 1178 int 1179 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1180 { 1181 dsl_dataset_snapshot_arg_t ddsa; 1182 nvpair_t *pair; 1183 boolean_t needsuspend; 1184 int error; 1185 spa_t *spa; 1186 char *firstname; 1187 nvlist_t *suspended = NULL; 1188 1189 pair = nvlist_next_nvpair(snaps, NULL); 1190 if (pair == NULL) 1191 return (0); 1192 firstname = nvpair_name(pair); 1193 1194 error = spa_open(firstname, &spa, FTAG); 1195 if (error != 0) 1196 return (error); 1197 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1198 spa_close(spa, FTAG); 1199 1200 if (needsuspend) { 1201 suspended = fnvlist_alloc(); 1202 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1203 pair = nvlist_next_nvpair(snaps, pair)) { 1204 char fsname[MAXNAMELEN]; 1205 char *snapname = nvpair_name(pair); 1206 char *atp; 1207 void *cookie; 1208 1209 atp = strchr(snapname, '@'); 1210 if (atp == NULL) { 1211 error = SET_ERROR(EINVAL); 1212 break; 1213 } 1214 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1215 1216 error = zil_suspend(fsname, &cookie); 1217 if (error != 0) 1218 break; 1219 fnvlist_add_uint64(suspended, fsname, 1220 (uintptr_t)cookie); 1221 } 1222 } 1223 1224 ddsa.ddsa_snaps = snaps; 1225 ddsa.ddsa_props = props; 1226 ddsa.ddsa_errors = errors; 1227 1228 if (error == 0) { 1229 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1230 dsl_dataset_snapshot_sync, &ddsa, 1231 fnvlist_num_pairs(snaps) * 3); 1232 } 1233 1234 if (suspended != NULL) { 1235 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1236 pair = nvlist_next_nvpair(suspended, pair)) { 1237 zil_resume((void *)(uintptr_t) 1238 fnvpair_value_uint64(pair)); 1239 } 1240 fnvlist_free(suspended); 1241 } 1242 1243 return (error); 1244 } 1245 1246 typedef struct dsl_dataset_snapshot_tmp_arg { 1247 const char *ddsta_fsname; 1248 const char *ddsta_snapname; 1249 minor_t ddsta_cleanup_minor; 1250 const char *ddsta_htag; 1251 } dsl_dataset_snapshot_tmp_arg_t; 1252 1253 static int 1254 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1255 { 1256 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1257 dsl_pool_t *dp = dmu_tx_pool(tx); 1258 dsl_dataset_t *ds; 1259 int error; 1260 1261 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1262 if (error != 0) 1263 return (error); 1264 1265 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, tx); 1266 if (error != 0) { 1267 dsl_dataset_rele(ds, FTAG); 1268 return (error); 1269 } 1270 1271 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1272 dsl_dataset_rele(ds, FTAG); 1273 return (SET_ERROR(ENOTSUP)); 1274 } 1275 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1276 B_TRUE, tx); 1277 if (error != 0) { 1278 dsl_dataset_rele(ds, FTAG); 1279 return (error); 1280 } 1281 1282 dsl_dataset_rele(ds, FTAG); 1283 return (0); 1284 } 1285 1286 static void 1287 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1288 { 1289 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1290 dsl_pool_t *dp = dmu_tx_pool(tx); 1291 dsl_dataset_t *ds; 1292 1293 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1294 1295 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1296 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1297 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1298 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1299 1300 dsl_dataset_rele(ds, FTAG); 1301 } 1302 1303 int 1304 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1305 minor_t cleanup_minor, const char *htag) 1306 { 1307 dsl_dataset_snapshot_tmp_arg_t ddsta; 1308 int error; 1309 spa_t *spa; 1310 boolean_t needsuspend; 1311 void *cookie; 1312 1313 ddsta.ddsta_fsname = fsname; 1314 ddsta.ddsta_snapname = snapname; 1315 ddsta.ddsta_cleanup_minor = cleanup_minor; 1316 ddsta.ddsta_htag = htag; 1317 1318 error = spa_open(fsname, &spa, FTAG); 1319 if (error != 0) 1320 return (error); 1321 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1322 spa_close(spa, FTAG); 1323 1324 if (needsuspend) { 1325 error = zil_suspend(fsname, &cookie); 1326 if (error != 0) 1327 return (error); 1328 } 1329 1330 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1331 dsl_dataset_snapshot_tmp_sync, &ddsta, 3); 1332 1333 if (needsuspend) 1334 zil_resume(cookie); 1335 return (error); 1336 } 1337 1338 1339 void 1340 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1341 { 1342 ASSERT(dmu_tx_is_syncing(tx)); 1343 ASSERT(ds->ds_objset != NULL); 1344 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1345 1346 /* 1347 * in case we had to change ds_fsid_guid when we opened it, 1348 * sync it out now. 1349 */ 1350 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1351 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1352 1353 dmu_objset_sync(ds->ds_objset, zio, tx); 1354 } 1355 1356 static void 1357 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1358 { 1359 uint64_t count = 0; 1360 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1361 zap_cursor_t zc; 1362 zap_attribute_t za; 1363 nvlist_t *propval = fnvlist_alloc(); 1364 nvlist_t *val = fnvlist_alloc(); 1365 1366 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1367 1368 /* 1369 * There may be missing entries in ds_next_clones_obj 1370 * due to a bug in a previous version of the code. 1371 * Only trust it if it has the right number of entries. 1372 */ 1373 if (ds->ds_phys->ds_next_clones_obj != 0) { 1374 ASSERT0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 1375 &count)); 1376 } 1377 if (count != ds->ds_phys->ds_num_children - 1) 1378 goto fail; 1379 for (zap_cursor_init(&zc, mos, ds->ds_phys->ds_next_clones_obj); 1380 zap_cursor_retrieve(&zc, &za) == 0; 1381 zap_cursor_advance(&zc)) { 1382 dsl_dataset_t *clone; 1383 char buf[ZFS_MAXNAMELEN]; 1384 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1385 za.za_first_integer, FTAG, &clone)); 1386 dsl_dir_name(clone->ds_dir, buf); 1387 fnvlist_add_boolean(val, buf); 1388 dsl_dataset_rele(clone, FTAG); 1389 } 1390 zap_cursor_fini(&zc); 1391 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1392 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1393 fail: 1394 nvlist_free(val); 1395 nvlist_free(propval); 1396 } 1397 1398 void 1399 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1400 { 1401 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1402 uint64_t refd, avail, uobjs, aobjs, ratio; 1403 1404 ASSERT(dsl_pool_config_held(dp)); 1405 1406 ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1407 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1408 ds->ds_phys->ds_compressed_bytes); 1409 1410 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1411 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1412 ds->ds_phys->ds_uncompressed_bytes); 1413 1414 if (dsl_dataset_is_snapshot(ds)) { 1415 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1416 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1417 ds->ds_phys->ds_unique_bytes); 1418 get_clones_stat(ds, nv); 1419 } else { 1420 dsl_dir_stats(ds->ds_dir, nv); 1421 } 1422 1423 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1424 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1425 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1426 1427 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1428 ds->ds_phys->ds_creation_time); 1429 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1430 ds->ds_phys->ds_creation_txg); 1431 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1432 ds->ds_quota); 1433 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1434 ds->ds_reserved); 1435 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1436 ds->ds_phys->ds_guid); 1437 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1438 ds->ds_phys->ds_unique_bytes); 1439 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1440 ds->ds_object); 1441 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1442 ds->ds_userrefs); 1443 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1444 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1445 1446 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1447 uint64_t written, comp, uncomp; 1448 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1449 dsl_dataset_t *prev; 1450 1451 int err = dsl_dataset_hold_obj(dp, 1452 ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 1453 if (err == 0) { 1454 err = dsl_dataset_space_written(prev, ds, &written, 1455 &comp, &uncomp); 1456 dsl_dataset_rele(prev, FTAG); 1457 if (err == 0) { 1458 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1459 written); 1460 } 1461 } 1462 } 1463 } 1464 1465 void 1466 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1467 { 1468 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1469 ASSERT(dsl_pool_config_held(dp)); 1470 1471 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1472 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1473 stat->dds_guid = ds->ds_phys->ds_guid; 1474 stat->dds_origin[0] = '\0'; 1475 if (dsl_dataset_is_snapshot(ds)) { 1476 stat->dds_is_snapshot = B_TRUE; 1477 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1478 } else { 1479 stat->dds_is_snapshot = B_FALSE; 1480 stat->dds_num_clones = 0; 1481 1482 if (dsl_dir_is_clone(ds->ds_dir)) { 1483 dsl_dataset_t *ods; 1484 1485 VERIFY0(dsl_dataset_hold_obj(dp, 1486 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1487 dsl_dataset_name(ods, stat->dds_origin); 1488 dsl_dataset_rele(ods, FTAG); 1489 } 1490 } 1491 } 1492 1493 uint64_t 1494 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1495 { 1496 return (ds->ds_fsid_guid); 1497 } 1498 1499 void 1500 dsl_dataset_space(dsl_dataset_t *ds, 1501 uint64_t *refdbytesp, uint64_t *availbytesp, 1502 uint64_t *usedobjsp, uint64_t *availobjsp) 1503 { 1504 *refdbytesp = ds->ds_phys->ds_referenced_bytes; 1505 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1506 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1507 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1508 if (ds->ds_quota != 0) { 1509 /* 1510 * Adjust available bytes according to refquota 1511 */ 1512 if (*refdbytesp < ds->ds_quota) 1513 *availbytesp = MIN(*availbytesp, 1514 ds->ds_quota - *refdbytesp); 1515 else 1516 *availbytesp = 0; 1517 } 1518 *usedobjsp = ds->ds_phys->ds_bp.blk_fill; 1519 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1520 } 1521 1522 boolean_t 1523 dsl_dataset_modified_since_lastsnap(dsl_dataset_t *ds) 1524 { 1525 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1526 1527 ASSERT(dsl_pool_config_held(dp)); 1528 if (ds->ds_prev == NULL) 1529 return (B_FALSE); 1530 if (ds->ds_phys->ds_bp.blk_birth > 1531 ds->ds_prev->ds_phys->ds_creation_txg) { 1532 objset_t *os, *os_prev; 1533 /* 1534 * It may be that only the ZIL differs, because it was 1535 * reset in the head. Don't count that as being 1536 * modified. 1537 */ 1538 if (dmu_objset_from_ds(ds, &os) != 0) 1539 return (B_TRUE); 1540 if (dmu_objset_from_ds(ds->ds_prev, &os_prev) != 0) 1541 return (B_TRUE); 1542 return (bcmp(&os->os_phys->os_meta_dnode, 1543 &os_prev->os_phys->os_meta_dnode, 1544 sizeof (os->os_phys->os_meta_dnode)) != 0); 1545 } 1546 return (B_FALSE); 1547 } 1548 1549 typedef struct dsl_dataset_rename_snapshot_arg { 1550 const char *ddrsa_fsname; 1551 const char *ddrsa_oldsnapname; 1552 const char *ddrsa_newsnapname; 1553 boolean_t ddrsa_recursive; 1554 dmu_tx_t *ddrsa_tx; 1555 } dsl_dataset_rename_snapshot_arg_t; 1556 1557 /* ARGSUSED */ 1558 static int 1559 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1560 dsl_dataset_t *hds, void *arg) 1561 { 1562 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1563 int error; 1564 uint64_t val; 1565 1566 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1567 if (error != 0) { 1568 /* ignore nonexistent snapshots */ 1569 return (error == ENOENT ? 0 : error); 1570 } 1571 1572 /* new name should not exist */ 1573 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1574 if (error == 0) 1575 error = SET_ERROR(EEXIST); 1576 else if (error == ENOENT) 1577 error = 0; 1578 1579 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1580 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1581 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 1582 error = SET_ERROR(ENAMETOOLONG); 1583 1584 return (error); 1585 } 1586 1587 static int 1588 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1589 { 1590 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1591 dsl_pool_t *dp = dmu_tx_pool(tx); 1592 dsl_dataset_t *hds; 1593 int error; 1594 1595 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1596 if (error != 0) 1597 return (error); 1598 1599 if (ddrsa->ddrsa_recursive) { 1600 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1601 dsl_dataset_rename_snapshot_check_impl, ddrsa, 1602 DS_FIND_CHILDREN); 1603 } else { 1604 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 1605 } 1606 dsl_dataset_rele(hds, FTAG); 1607 return (error); 1608 } 1609 1610 static int 1611 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 1612 dsl_dataset_t *hds, void *arg) 1613 { 1614 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1615 dsl_dataset_t *ds; 1616 uint64_t val; 1617 dmu_tx_t *tx = ddrsa->ddrsa_tx; 1618 int error; 1619 1620 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1621 ASSERT(error == 0 || error == ENOENT); 1622 if (error == ENOENT) { 1623 /* ignore nonexistent snapshots */ 1624 return (0); 1625 } 1626 1627 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 1628 1629 /* log before we change the name */ 1630 spa_history_log_internal_ds(ds, "rename", tx, 1631 "-> @%s", ddrsa->ddrsa_newsnapname); 1632 1633 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx)); 1634 mutex_enter(&ds->ds_lock); 1635 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 1636 mutex_exit(&ds->ds_lock); 1637 VERIFY0(zap_add(dp->dp_meta_objset, hds->ds_phys->ds_snapnames_zapobj, 1638 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 1639 1640 dsl_dataset_rele(ds, FTAG); 1641 return (0); 1642 } 1643 1644 static void 1645 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 1646 { 1647 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1648 dsl_pool_t *dp = dmu_tx_pool(tx); 1649 dsl_dataset_t *hds; 1650 1651 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 1652 ddrsa->ddrsa_tx = tx; 1653 if (ddrsa->ddrsa_recursive) { 1654 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1655 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 1656 DS_FIND_CHILDREN)); 1657 } else { 1658 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 1659 } 1660 dsl_dataset_rele(hds, FTAG); 1661 } 1662 1663 int 1664 dsl_dataset_rename_snapshot(const char *fsname, 1665 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 1666 { 1667 dsl_dataset_rename_snapshot_arg_t ddrsa; 1668 1669 ddrsa.ddrsa_fsname = fsname; 1670 ddrsa.ddrsa_oldsnapname = oldsnapname; 1671 ddrsa.ddrsa_newsnapname = newsnapname; 1672 ddrsa.ddrsa_recursive = recursive; 1673 1674 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 1675 dsl_dataset_rename_snapshot_sync, &ddrsa, 1)); 1676 } 1677 1678 static int 1679 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 1680 { 1681 const char *fsname = arg; 1682 dsl_pool_t *dp = dmu_tx_pool(tx); 1683 dsl_dataset_t *ds; 1684 int64_t unused_refres_delta; 1685 int error; 1686 1687 error = dsl_dataset_hold(dp, fsname, FTAG, &ds); 1688 if (error != 0) 1689 return (error); 1690 1691 /* must not be a snapshot */ 1692 if (dsl_dataset_is_snapshot(ds)) { 1693 dsl_dataset_rele(ds, FTAG); 1694 return (SET_ERROR(EINVAL)); 1695 } 1696 1697 /* must have a most recent snapshot */ 1698 if (ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) { 1699 dsl_dataset_rele(ds, FTAG); 1700 return (SET_ERROR(EINVAL)); 1701 } 1702 1703 if (dsl_dataset_long_held(ds)) { 1704 dsl_dataset_rele(ds, FTAG); 1705 return (SET_ERROR(EBUSY)); 1706 } 1707 1708 /* 1709 * Check if the snap we are rolling back to uses more than 1710 * the refquota. 1711 */ 1712 if (ds->ds_quota != 0 && 1713 ds->ds_prev->ds_phys->ds_referenced_bytes > ds->ds_quota) { 1714 dsl_dataset_rele(ds, FTAG); 1715 return (SET_ERROR(EDQUOT)); 1716 } 1717 1718 /* 1719 * When we do the clone swap, we will temporarily use more space 1720 * due to the refreservation (the head will no longer have any 1721 * unique space, so the entire amount of the refreservation will need 1722 * to be free). We will immediately destroy the clone, freeing 1723 * this space, but the freeing happens over many txg's. 1724 */ 1725 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 1726 ds->ds_phys->ds_unique_bytes); 1727 1728 if (unused_refres_delta > 0 && 1729 unused_refres_delta > 1730 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 1731 dsl_dataset_rele(ds, FTAG); 1732 return (SET_ERROR(ENOSPC)); 1733 } 1734 1735 dsl_dataset_rele(ds, FTAG); 1736 return (0); 1737 } 1738 1739 static void 1740 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 1741 { 1742 const char *fsname = arg; 1743 dsl_pool_t *dp = dmu_tx_pool(tx); 1744 dsl_dataset_t *ds, *clone; 1745 uint64_t cloneobj; 1746 1747 VERIFY0(dsl_dataset_hold(dp, fsname, FTAG, &ds)); 1748 1749 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 1750 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 1751 1752 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 1753 1754 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 1755 dsl_dataset_zero_zil(ds, tx); 1756 1757 dsl_destroy_head_sync_impl(clone, tx); 1758 1759 dsl_dataset_rele(clone, FTAG); 1760 dsl_dataset_rele(ds, FTAG); 1761 } 1762 1763 int 1764 dsl_dataset_rollback(const char *fsname) 1765 { 1766 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 1767 dsl_dataset_rollback_sync, (void *)fsname, 1)); 1768 } 1769 1770 struct promotenode { 1771 list_node_t link; 1772 dsl_dataset_t *ds; 1773 }; 1774 1775 typedef struct dsl_dataset_promote_arg { 1776 const char *ddpa_clonename; 1777 dsl_dataset_t *ddpa_clone; 1778 list_t shared_snaps, origin_snaps, clone_snaps; 1779 dsl_dataset_t *origin_origin; /* origin of the origin */ 1780 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 1781 char *err_ds; 1782 } dsl_dataset_promote_arg_t; 1783 1784 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 1785 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 1786 void *tag); 1787 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 1788 1789 static int 1790 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 1791 { 1792 dsl_dataset_promote_arg_t *ddpa = arg; 1793 dsl_pool_t *dp = dmu_tx_pool(tx); 1794 dsl_dataset_t *hds; 1795 struct promotenode *snap; 1796 dsl_dataset_t *origin_ds; 1797 int err; 1798 uint64_t unused; 1799 1800 err = promote_hold(ddpa, dp, FTAG); 1801 if (err != 0) 1802 return (err); 1803 1804 hds = ddpa->ddpa_clone; 1805 1806 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { 1807 promote_rele(ddpa, FTAG); 1808 return (SET_ERROR(EXDEV)); 1809 } 1810 1811 /* 1812 * Compute and check the amount of space to transfer. Since this is 1813 * so expensive, don't do the preliminary check. 1814 */ 1815 if (!dmu_tx_is_syncing(tx)) { 1816 promote_rele(ddpa, FTAG); 1817 return (0); 1818 } 1819 1820 snap = list_head(&ddpa->shared_snaps); 1821 origin_ds = snap->ds; 1822 1823 /* compute origin's new unique space */ 1824 snap = list_tail(&ddpa->clone_snaps); 1825 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 1826 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 1827 origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, 1828 &ddpa->unique, &unused, &unused); 1829 1830 /* 1831 * Walk the snapshots that we are moving 1832 * 1833 * Compute space to transfer. Consider the incremental changes 1834 * to used by each snapshot: 1835 * (my used) = (prev's used) + (blocks born) - (blocks killed) 1836 * So each snapshot gave birth to: 1837 * (blocks born) = (my used) - (prev's used) + (blocks killed) 1838 * So a sequence would look like: 1839 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 1840 * Which simplifies to: 1841 * uN + kN + kN-1 + ... + k1 + k0 1842 * Note however, if we stop before we reach the ORIGIN we get: 1843 * uN + kN + kN-1 + ... + kM - uM-1 1844 */ 1845 ddpa->used = origin_ds->ds_phys->ds_referenced_bytes; 1846 ddpa->comp = origin_ds->ds_phys->ds_compressed_bytes; 1847 ddpa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 1848 for (snap = list_head(&ddpa->shared_snaps); snap; 1849 snap = list_next(&ddpa->shared_snaps, snap)) { 1850 uint64_t val, dlused, dlcomp, dluncomp; 1851 dsl_dataset_t *ds = snap->ds; 1852 1853 /* 1854 * If there are long holds, we won't be able to evict 1855 * the objset. 1856 */ 1857 if (dsl_dataset_long_held(ds)) { 1858 err = SET_ERROR(EBUSY); 1859 goto out; 1860 } 1861 1862 /* Check that the snapshot name does not conflict */ 1863 VERIFY0(dsl_dataset_get_snapname(ds)); 1864 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 1865 if (err == 0) { 1866 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 1867 err = SET_ERROR(EEXIST); 1868 goto out; 1869 } 1870 if (err != ENOENT) 1871 goto out; 1872 1873 /* The very first snapshot does not have a deadlist */ 1874 if (ds->ds_phys->ds_prev_snap_obj == 0) 1875 continue; 1876 1877 dsl_deadlist_space(&ds->ds_deadlist, 1878 &dlused, &dlcomp, &dluncomp); 1879 ddpa->used += dlused; 1880 ddpa->comp += dlcomp; 1881 ddpa->uncomp += dluncomp; 1882 } 1883 1884 /* 1885 * If we are a clone of a clone then we never reached ORIGIN, 1886 * so we need to subtract out the clone origin's used space. 1887 */ 1888 if (ddpa->origin_origin) { 1889 ddpa->used -= ddpa->origin_origin->ds_phys->ds_referenced_bytes; 1890 ddpa->comp -= ddpa->origin_origin->ds_phys->ds_compressed_bytes; 1891 ddpa->uncomp -= 1892 ddpa->origin_origin->ds_phys->ds_uncompressed_bytes; 1893 } 1894 1895 /* Check that there is enough space here */ 1896 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 1897 ddpa->used); 1898 if (err != 0) 1899 goto out; 1900 1901 /* 1902 * Compute the amounts of space that will be used by snapshots 1903 * after the promotion (for both origin and clone). For each, 1904 * it is the amount of space that will be on all of their 1905 * deadlists (that was not born before their new origin). 1906 */ 1907 if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 1908 uint64_t space; 1909 1910 /* 1911 * Note, typically this will not be a clone of a clone, 1912 * so dd_origin_txg will be < TXG_INITIAL, so 1913 * these snaplist_space() -> dsl_deadlist_space_range() 1914 * calls will be fast because they do not have to 1915 * iterate over all bps. 1916 */ 1917 snap = list_head(&ddpa->origin_snaps); 1918 err = snaplist_space(&ddpa->shared_snaps, 1919 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 1920 if (err != 0) 1921 goto out; 1922 1923 err = snaplist_space(&ddpa->clone_snaps, 1924 snap->ds->ds_dir->dd_origin_txg, &space); 1925 if (err != 0) 1926 goto out; 1927 ddpa->cloneusedsnap += space; 1928 } 1929 if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 1930 err = snaplist_space(&ddpa->origin_snaps, 1931 origin_ds->ds_phys->ds_creation_txg, &ddpa->originusedsnap); 1932 if (err != 0) 1933 goto out; 1934 } 1935 1936 out: 1937 promote_rele(ddpa, FTAG); 1938 return (err); 1939 } 1940 1941 static void 1942 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 1943 { 1944 dsl_dataset_promote_arg_t *ddpa = arg; 1945 dsl_pool_t *dp = dmu_tx_pool(tx); 1946 dsl_dataset_t *hds; 1947 struct promotenode *snap; 1948 dsl_dataset_t *origin_ds; 1949 dsl_dataset_t *origin_head; 1950 dsl_dir_t *dd; 1951 dsl_dir_t *odd = NULL; 1952 uint64_t oldnext_obj; 1953 int64_t delta; 1954 1955 VERIFY0(promote_hold(ddpa, dp, FTAG)); 1956 hds = ddpa->ddpa_clone; 1957 1958 ASSERT0(hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE); 1959 1960 snap = list_head(&ddpa->shared_snaps); 1961 origin_ds = snap->ds; 1962 dd = hds->ds_dir; 1963 1964 snap = list_head(&ddpa->origin_snaps); 1965 origin_head = snap->ds; 1966 1967 /* 1968 * We need to explicitly open odd, since origin_ds's dd will be 1969 * changing. 1970 */ 1971 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 1972 NULL, FTAG, &odd)); 1973 1974 /* change origin's next snap */ 1975 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 1976 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; 1977 snap = list_tail(&ddpa->clone_snaps); 1978 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 1979 origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; 1980 1981 /* change the origin's next clone */ 1982 if (origin_ds->ds_phys->ds_next_clones_obj) { 1983 dsl_dataset_remove_from_next_clones(origin_ds, 1984 snap->ds->ds_object, tx); 1985 VERIFY0(zap_add_int(dp->dp_meta_objset, 1986 origin_ds->ds_phys->ds_next_clones_obj, 1987 oldnext_obj, tx)); 1988 } 1989 1990 /* change origin */ 1991 dmu_buf_will_dirty(dd->dd_dbuf, tx); 1992 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 1993 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 1994 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 1995 dmu_buf_will_dirty(odd->dd_dbuf, tx); 1996 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 1997 origin_head->ds_dir->dd_origin_txg = 1998 origin_ds->ds_phys->ds_creation_txg; 1999 2000 /* change dd_clone entries */ 2001 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2002 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2003 odd->dd_phys->dd_clones, hds->ds_object, tx)); 2004 VERIFY0(zap_add_int(dp->dp_meta_objset, 2005 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2006 hds->ds_object, tx)); 2007 2008 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2009 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2010 origin_head->ds_object, tx)); 2011 if (dd->dd_phys->dd_clones == 0) { 2012 dd->dd_phys->dd_clones = zap_create(dp->dp_meta_objset, 2013 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 2014 } 2015 VERIFY0(zap_add_int(dp->dp_meta_objset, 2016 dd->dd_phys->dd_clones, origin_head->ds_object, tx)); 2017 } 2018 2019 /* move snapshots to this dir */ 2020 for (snap = list_head(&ddpa->shared_snaps); snap; 2021 snap = list_next(&ddpa->shared_snaps, snap)) { 2022 dsl_dataset_t *ds = snap->ds; 2023 2024 /* 2025 * Property callbacks are registered to a particular 2026 * dsl_dir. Since ours is changing, evict the objset 2027 * so that they will be unregistered from the old dsl_dir. 2028 */ 2029 if (ds->ds_objset) { 2030 dmu_objset_evict(ds->ds_objset); 2031 ds->ds_objset = NULL; 2032 } 2033 2034 /* move snap name entry */ 2035 VERIFY0(dsl_dataset_get_snapname(ds)); 2036 VERIFY0(dsl_dataset_snap_remove(origin_head, 2037 ds->ds_snapname, tx)); 2038 VERIFY0(zap_add(dp->dp_meta_objset, 2039 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2040 8, 1, &ds->ds_object, tx)); 2041 2042 /* change containing dsl_dir */ 2043 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2044 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2045 ds->ds_phys->ds_dir_obj = dd->dd_object; 2046 ASSERT3P(ds->ds_dir, ==, odd); 2047 dsl_dir_rele(ds->ds_dir, ds); 2048 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2049 NULL, ds, &ds->ds_dir)); 2050 2051 /* move any clone references */ 2052 if (ds->ds_phys->ds_next_clones_obj && 2053 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2054 zap_cursor_t zc; 2055 zap_attribute_t za; 2056 2057 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2058 ds->ds_phys->ds_next_clones_obj); 2059 zap_cursor_retrieve(&zc, &za) == 0; 2060 zap_cursor_advance(&zc)) { 2061 dsl_dataset_t *cnds; 2062 uint64_t o; 2063 2064 if (za.za_first_integer == oldnext_obj) { 2065 /* 2066 * We've already moved the 2067 * origin's reference. 2068 */ 2069 continue; 2070 } 2071 2072 VERIFY0(dsl_dataset_hold_obj(dp, 2073 za.za_first_integer, FTAG, &cnds)); 2074 o = cnds->ds_dir->dd_phys->dd_head_dataset_obj; 2075 2076 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2077 odd->dd_phys->dd_clones, o, tx)); 2078 VERIFY0(zap_add_int(dp->dp_meta_objset, 2079 dd->dd_phys->dd_clones, o, tx)); 2080 dsl_dataset_rele(cnds, FTAG); 2081 } 2082 zap_cursor_fini(&zc); 2083 } 2084 2085 ASSERT(!dsl_prop_hascb(ds)); 2086 } 2087 2088 /* 2089 * Change space accounting. 2090 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2091 * both be valid, or both be 0 (resulting in delta == 0). This 2092 * is true for each of {clone,origin} independently. 2093 */ 2094 2095 delta = ddpa->cloneusedsnap - 2096 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2097 ASSERT3S(delta, >=, 0); 2098 ASSERT3U(ddpa->used, >=, delta); 2099 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2100 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2101 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2102 2103 delta = ddpa->originusedsnap - 2104 odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2105 ASSERT3S(delta, <=, 0); 2106 ASSERT3U(ddpa->used, >=, -delta); 2107 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2108 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2109 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2110 2111 origin_ds->ds_phys->ds_unique_bytes = ddpa->unique; 2112 2113 /* log history record */ 2114 spa_history_log_internal_ds(hds, "promote", tx, ""); 2115 2116 dsl_dir_rele(odd, FTAG); 2117 promote_rele(ddpa, FTAG); 2118 } 2119 2120 /* 2121 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2122 * (exclusive) and last_obj (inclusive). The list will be in reverse 2123 * order (last_obj will be the list_head()). If first_obj == 0, do all 2124 * snapshots back to this dataset's origin. 2125 */ 2126 static int 2127 snaplist_make(dsl_pool_t *dp, 2128 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2129 { 2130 uint64_t obj = last_obj; 2131 2132 list_create(l, sizeof (struct promotenode), 2133 offsetof(struct promotenode, link)); 2134 2135 while (obj != first_obj) { 2136 dsl_dataset_t *ds; 2137 struct promotenode *snap; 2138 int err; 2139 2140 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2141 ASSERT(err != ENOENT); 2142 if (err != 0) 2143 return (err); 2144 2145 if (first_obj == 0) 2146 first_obj = ds->ds_dir->dd_phys->dd_origin_obj; 2147 2148 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2149 snap->ds = ds; 2150 list_insert_tail(l, snap); 2151 obj = ds->ds_phys->ds_prev_snap_obj; 2152 } 2153 2154 return (0); 2155 } 2156 2157 static int 2158 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2159 { 2160 struct promotenode *snap; 2161 2162 *spacep = 0; 2163 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2164 uint64_t used, comp, uncomp; 2165 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2166 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2167 *spacep += used; 2168 } 2169 return (0); 2170 } 2171 2172 static void 2173 snaplist_destroy(list_t *l, void *tag) 2174 { 2175 struct promotenode *snap; 2176 2177 if (l == NULL || !list_link_active(&l->list_head)) 2178 return; 2179 2180 while ((snap = list_tail(l)) != NULL) { 2181 list_remove(l, snap); 2182 dsl_dataset_rele(snap->ds, tag); 2183 kmem_free(snap, sizeof (*snap)); 2184 } 2185 list_destroy(l); 2186 } 2187 2188 static int 2189 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2190 { 2191 int error; 2192 dsl_dir_t *dd; 2193 struct promotenode *snap; 2194 2195 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2196 &ddpa->ddpa_clone); 2197 if (error != 0) 2198 return (error); 2199 dd = ddpa->ddpa_clone->ds_dir; 2200 2201 if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) || 2202 !dsl_dir_is_clone(dd)) { 2203 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2204 return (SET_ERROR(EINVAL)); 2205 } 2206 2207 error = snaplist_make(dp, 0, dd->dd_phys->dd_origin_obj, 2208 &ddpa->shared_snaps, tag); 2209 if (error != 0) 2210 goto out; 2211 2212 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2213 &ddpa->clone_snaps, tag); 2214 if (error != 0) 2215 goto out; 2216 2217 snap = list_head(&ddpa->shared_snaps); 2218 ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); 2219 error = snaplist_make(dp, dd->dd_phys->dd_origin_obj, 2220 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, 2221 &ddpa->origin_snaps, tag); 2222 if (error != 0) 2223 goto out; 2224 2225 if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) { 2226 error = dsl_dataset_hold_obj(dp, 2227 snap->ds->ds_dir->dd_phys->dd_origin_obj, 2228 tag, &ddpa->origin_origin); 2229 if (error != 0) 2230 goto out; 2231 } 2232 out: 2233 if (error != 0) 2234 promote_rele(ddpa, tag); 2235 return (error); 2236 } 2237 2238 static void 2239 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2240 { 2241 snaplist_destroy(&ddpa->shared_snaps, tag); 2242 snaplist_destroy(&ddpa->clone_snaps, tag); 2243 snaplist_destroy(&ddpa->origin_snaps, tag); 2244 if (ddpa->origin_origin != NULL) 2245 dsl_dataset_rele(ddpa->origin_origin, tag); 2246 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2247 } 2248 2249 /* 2250 * Promote a clone. 2251 * 2252 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2253 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2254 */ 2255 int 2256 dsl_dataset_promote(const char *name, char *conflsnap) 2257 { 2258 dsl_dataset_promote_arg_t ddpa = { 0 }; 2259 uint64_t numsnaps; 2260 int error; 2261 objset_t *os; 2262 2263 /* 2264 * We will modify space proportional to the number of 2265 * snapshots. Compute numsnaps. 2266 */ 2267 error = dmu_objset_hold(name, FTAG, &os); 2268 if (error != 0) 2269 return (error); 2270 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2271 dmu_objset_ds(os)->ds_phys->ds_snapnames_zapobj, &numsnaps); 2272 dmu_objset_rele(os, FTAG); 2273 if (error != 0) 2274 return (error); 2275 2276 ddpa.ddpa_clonename = name; 2277 ddpa.err_ds = conflsnap; 2278 2279 return (dsl_sync_task(name, dsl_dataset_promote_check, 2280 dsl_dataset_promote_sync, &ddpa, 2 + numsnaps)); 2281 } 2282 2283 int 2284 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2285 dsl_dataset_t *origin_head, boolean_t force) 2286 { 2287 int64_t unused_refres_delta; 2288 2289 /* they should both be heads */ 2290 if (dsl_dataset_is_snapshot(clone) || 2291 dsl_dataset_is_snapshot(origin_head)) 2292 return (SET_ERROR(EINVAL)); 2293 2294 /* the branch point should be just before them */ 2295 if (clone->ds_prev != origin_head->ds_prev) 2296 return (SET_ERROR(EINVAL)); 2297 2298 /* clone should be the clone (unless they are unrelated) */ 2299 if (clone->ds_prev != NULL && 2300 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2301 origin_head->ds_object != 2302 clone->ds_prev->ds_phys->ds_next_snap_obj) 2303 return (SET_ERROR(EINVAL)); 2304 2305 /* the clone should be a child of the origin */ 2306 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2307 return (SET_ERROR(EINVAL)); 2308 2309 /* origin_head shouldn't be modified unless 'force' */ 2310 if (!force && dsl_dataset_modified_since_lastsnap(origin_head)) 2311 return (SET_ERROR(ETXTBSY)); 2312 2313 /* origin_head should have no long holds (e.g. is not mounted) */ 2314 if (dsl_dataset_long_held(origin_head)) 2315 return (SET_ERROR(EBUSY)); 2316 2317 /* check amount of any unconsumed refreservation */ 2318 unused_refres_delta = 2319 (int64_t)MIN(origin_head->ds_reserved, 2320 origin_head->ds_phys->ds_unique_bytes) - 2321 (int64_t)MIN(origin_head->ds_reserved, 2322 clone->ds_phys->ds_unique_bytes); 2323 2324 if (unused_refres_delta > 0 && 2325 unused_refres_delta > 2326 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2327 return (SET_ERROR(ENOSPC)); 2328 2329 /* clone can't be over the head's refquota */ 2330 if (origin_head->ds_quota != 0 && 2331 clone->ds_phys->ds_referenced_bytes > origin_head->ds_quota) 2332 return (SET_ERROR(EDQUOT)); 2333 2334 return (0); 2335 } 2336 2337 void 2338 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2339 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2340 { 2341 dsl_pool_t *dp = dmu_tx_pool(tx); 2342 int64_t unused_refres_delta; 2343 2344 ASSERT(clone->ds_reserved == 0); 2345 ASSERT(origin_head->ds_quota == 0 || 2346 clone->ds_phys->ds_unique_bytes <= origin_head->ds_quota); 2347 2348 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2349 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2350 2351 if (clone->ds_objset != NULL) { 2352 dmu_objset_evict(clone->ds_objset); 2353 clone->ds_objset = NULL; 2354 } 2355 2356 if (origin_head->ds_objset != NULL) { 2357 dmu_objset_evict(origin_head->ds_objset); 2358 origin_head->ds_objset = NULL; 2359 } 2360 2361 unused_refres_delta = 2362 (int64_t)MIN(origin_head->ds_reserved, 2363 origin_head->ds_phys->ds_unique_bytes) - 2364 (int64_t)MIN(origin_head->ds_reserved, 2365 clone->ds_phys->ds_unique_bytes); 2366 2367 /* 2368 * Reset origin's unique bytes, if it exists. 2369 */ 2370 if (clone->ds_prev) { 2371 dsl_dataset_t *origin = clone->ds_prev; 2372 uint64_t comp, uncomp; 2373 2374 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2375 dsl_deadlist_space_range(&clone->ds_deadlist, 2376 origin->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2377 &origin->ds_phys->ds_unique_bytes, &comp, &uncomp); 2378 } 2379 2380 /* swap blkptrs */ 2381 { 2382 blkptr_t tmp; 2383 tmp = origin_head->ds_phys->ds_bp; 2384 origin_head->ds_phys->ds_bp = clone->ds_phys->ds_bp; 2385 clone->ds_phys->ds_bp = tmp; 2386 } 2387 2388 /* set dd_*_bytes */ 2389 { 2390 int64_t dused, dcomp, duncomp; 2391 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2392 uint64_t odl_used, odl_comp, odl_uncomp; 2393 2394 ASSERT3U(clone->ds_dir->dd_phys-> 2395 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2396 2397 dsl_deadlist_space(&clone->ds_deadlist, 2398 &cdl_used, &cdl_comp, &cdl_uncomp); 2399 dsl_deadlist_space(&origin_head->ds_deadlist, 2400 &odl_used, &odl_comp, &odl_uncomp); 2401 2402 dused = clone->ds_phys->ds_referenced_bytes + cdl_used - 2403 (origin_head->ds_phys->ds_referenced_bytes + odl_used); 2404 dcomp = clone->ds_phys->ds_compressed_bytes + cdl_comp - 2405 (origin_head->ds_phys->ds_compressed_bytes + odl_comp); 2406 duncomp = clone->ds_phys->ds_uncompressed_bytes + 2407 cdl_uncomp - 2408 (origin_head->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2409 2410 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2411 dused, dcomp, duncomp, tx); 2412 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2413 -dused, -dcomp, -duncomp, tx); 2414 2415 /* 2416 * The difference in the space used by snapshots is the 2417 * difference in snapshot space due to the head's 2418 * deadlist (since that's the only thing that's 2419 * changing that affects the snapused). 2420 */ 2421 dsl_deadlist_space_range(&clone->ds_deadlist, 2422 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2423 &cdl_used, &cdl_comp, &cdl_uncomp); 2424 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2425 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2426 &odl_used, &odl_comp, &odl_uncomp); 2427 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2428 DD_USED_HEAD, DD_USED_SNAP, tx); 2429 } 2430 2431 /* swap ds_*_bytes */ 2432 SWITCH64(origin_head->ds_phys->ds_referenced_bytes, 2433 clone->ds_phys->ds_referenced_bytes); 2434 SWITCH64(origin_head->ds_phys->ds_compressed_bytes, 2435 clone->ds_phys->ds_compressed_bytes); 2436 SWITCH64(origin_head->ds_phys->ds_uncompressed_bytes, 2437 clone->ds_phys->ds_uncompressed_bytes); 2438 SWITCH64(origin_head->ds_phys->ds_unique_bytes, 2439 clone->ds_phys->ds_unique_bytes); 2440 2441 /* apply any parent delta for change in unconsumed refreservation */ 2442 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 2443 unused_refres_delta, 0, 0, tx); 2444 2445 /* 2446 * Swap deadlists. 2447 */ 2448 dsl_deadlist_close(&clone->ds_deadlist); 2449 dsl_deadlist_close(&origin_head->ds_deadlist); 2450 SWITCH64(origin_head->ds_phys->ds_deadlist_obj, 2451 clone->ds_phys->ds_deadlist_obj); 2452 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 2453 clone->ds_phys->ds_deadlist_obj); 2454 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 2455 origin_head->ds_phys->ds_deadlist_obj); 2456 2457 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 2458 2459 spa_history_log_internal_ds(clone, "clone swap", tx, 2460 "parent=%s", origin_head->ds_dir->dd_myname); 2461 } 2462 2463 /* 2464 * Given a pool name and a dataset object number in that pool, 2465 * return the name of that dataset. 2466 */ 2467 int 2468 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2469 { 2470 dsl_pool_t *dp; 2471 dsl_dataset_t *ds; 2472 int error; 2473 2474 error = dsl_pool_hold(pname, FTAG, &dp); 2475 if (error != 0) 2476 return (error); 2477 2478 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 2479 if (error == 0) { 2480 dsl_dataset_name(ds, buf); 2481 dsl_dataset_rele(ds, FTAG); 2482 } 2483 dsl_pool_rele(dp, FTAG); 2484 2485 return (error); 2486 } 2487 2488 int 2489 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2490 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2491 { 2492 int error = 0; 2493 2494 ASSERT3S(asize, >, 0); 2495 2496 /* 2497 * *ref_rsrv is the portion of asize that will come from any 2498 * unconsumed refreservation space. 2499 */ 2500 *ref_rsrv = 0; 2501 2502 mutex_enter(&ds->ds_lock); 2503 /* 2504 * Make a space adjustment for reserved bytes. 2505 */ 2506 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2507 ASSERT3U(*used, >=, 2508 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2509 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2510 *ref_rsrv = 2511 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2512 } 2513 2514 if (!check_quota || ds->ds_quota == 0) { 2515 mutex_exit(&ds->ds_lock); 2516 return (0); 2517 } 2518 /* 2519 * If they are requesting more space, and our current estimate 2520 * is over quota, they get to try again unless the actual 2521 * on-disk is over quota and there are no pending changes (which 2522 * may free up space for us). 2523 */ 2524 if (ds->ds_phys->ds_referenced_bytes + inflight >= ds->ds_quota) { 2525 if (inflight > 0 || 2526 ds->ds_phys->ds_referenced_bytes < ds->ds_quota) 2527 error = SET_ERROR(ERESTART); 2528 else 2529 error = SET_ERROR(EDQUOT); 2530 } 2531 mutex_exit(&ds->ds_lock); 2532 2533 return (error); 2534 } 2535 2536 typedef struct dsl_dataset_set_qr_arg { 2537 const char *ddsqra_name; 2538 zprop_source_t ddsqra_source; 2539 uint64_t ddsqra_value; 2540 } dsl_dataset_set_qr_arg_t; 2541 2542 2543 /* ARGSUSED */ 2544 static int 2545 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 2546 { 2547 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2548 dsl_pool_t *dp = dmu_tx_pool(tx); 2549 dsl_dataset_t *ds; 2550 int error; 2551 uint64_t newval; 2552 2553 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 2554 return (SET_ERROR(ENOTSUP)); 2555 2556 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2557 if (error != 0) 2558 return (error); 2559 2560 if (dsl_dataset_is_snapshot(ds)) { 2561 dsl_dataset_rele(ds, FTAG); 2562 return (SET_ERROR(EINVAL)); 2563 } 2564 2565 error = dsl_prop_predict(ds->ds_dir, 2566 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2567 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2568 if (error != 0) { 2569 dsl_dataset_rele(ds, FTAG); 2570 return (error); 2571 } 2572 2573 if (newval == 0) { 2574 dsl_dataset_rele(ds, FTAG); 2575 return (0); 2576 } 2577 2578 if (newval < ds->ds_phys->ds_referenced_bytes || 2579 newval < ds->ds_reserved) { 2580 dsl_dataset_rele(ds, FTAG); 2581 return (SET_ERROR(ENOSPC)); 2582 } 2583 2584 dsl_dataset_rele(ds, FTAG); 2585 return (0); 2586 } 2587 2588 static void 2589 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 2590 { 2591 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2592 dsl_pool_t *dp = dmu_tx_pool(tx); 2593 dsl_dataset_t *ds; 2594 uint64_t newval; 2595 2596 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2597 2598 dsl_prop_set_sync_impl(ds, 2599 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2600 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 2601 &ddsqra->ddsqra_value, tx); 2602 2603 VERIFY0(dsl_prop_get_int_ds(ds, 2604 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 2605 2606 if (ds->ds_quota != newval) { 2607 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2608 ds->ds_quota = newval; 2609 } 2610 dsl_dataset_rele(ds, FTAG); 2611 } 2612 2613 int 2614 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 2615 uint64_t refquota) 2616 { 2617 dsl_dataset_set_qr_arg_t ddsqra; 2618 2619 ddsqra.ddsqra_name = dsname; 2620 ddsqra.ddsqra_source = source; 2621 ddsqra.ddsqra_value = refquota; 2622 2623 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 2624 dsl_dataset_set_refquota_sync, &ddsqra, 0)); 2625 } 2626 2627 static int 2628 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 2629 { 2630 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2631 dsl_pool_t *dp = dmu_tx_pool(tx); 2632 dsl_dataset_t *ds; 2633 int error; 2634 uint64_t newval, unique; 2635 2636 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 2637 return (SET_ERROR(ENOTSUP)); 2638 2639 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2640 if (error != 0) 2641 return (error); 2642 2643 if (dsl_dataset_is_snapshot(ds)) { 2644 dsl_dataset_rele(ds, FTAG); 2645 return (SET_ERROR(EINVAL)); 2646 } 2647 2648 error = dsl_prop_predict(ds->ds_dir, 2649 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2650 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2651 if (error != 0) { 2652 dsl_dataset_rele(ds, FTAG); 2653 return (error); 2654 } 2655 2656 /* 2657 * If we are doing the preliminary check in open context, the 2658 * space estimates may be inaccurate. 2659 */ 2660 if (!dmu_tx_is_syncing(tx)) { 2661 dsl_dataset_rele(ds, FTAG); 2662 return (0); 2663 } 2664 2665 mutex_enter(&ds->ds_lock); 2666 if (!DS_UNIQUE_IS_ACCURATE(ds)) 2667 dsl_dataset_recalc_head_uniq(ds); 2668 unique = ds->ds_phys->ds_unique_bytes; 2669 mutex_exit(&ds->ds_lock); 2670 2671 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 2672 uint64_t delta = MAX(unique, newval) - 2673 MAX(unique, ds->ds_reserved); 2674 2675 if (delta > 2676 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 2677 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 2678 dsl_dataset_rele(ds, FTAG); 2679 return (SET_ERROR(ENOSPC)); 2680 } 2681 } 2682 2683 dsl_dataset_rele(ds, FTAG); 2684 return (0); 2685 } 2686 2687 void 2688 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 2689 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 2690 { 2691 uint64_t newval; 2692 uint64_t unique; 2693 int64_t delta; 2694 2695 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2696 source, sizeof (value), 1, &value, tx); 2697 2698 VERIFY0(dsl_prop_get_int_ds(ds, 2699 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 2700 2701 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2702 mutex_enter(&ds->ds_dir->dd_lock); 2703 mutex_enter(&ds->ds_lock); 2704 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 2705 unique = ds->ds_phys->ds_unique_bytes; 2706 delta = MAX(0, (int64_t)(newval - unique)) - 2707 MAX(0, (int64_t)(ds->ds_reserved - unique)); 2708 ds->ds_reserved = newval; 2709 mutex_exit(&ds->ds_lock); 2710 2711 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 2712 mutex_exit(&ds->ds_dir->dd_lock); 2713 } 2714 2715 static void 2716 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 2717 { 2718 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2719 dsl_pool_t *dp = dmu_tx_pool(tx); 2720 dsl_dataset_t *ds; 2721 2722 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2723 dsl_dataset_set_refreservation_sync_impl(ds, 2724 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 2725 dsl_dataset_rele(ds, FTAG); 2726 } 2727 2728 int 2729 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 2730 uint64_t refreservation) 2731 { 2732 dsl_dataset_set_qr_arg_t ddsqra; 2733 2734 ddsqra.ddsqra_name = dsname; 2735 ddsqra.ddsqra_source = source; 2736 ddsqra.ddsqra_value = refreservation; 2737 2738 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 2739 dsl_dataset_set_refreservation_sync, &ddsqra, 0)); 2740 } 2741 2742 /* 2743 * Return (in *usedp) the amount of space written in new that is not 2744 * present in oldsnap. New may be a snapshot or the head. Old must be 2745 * a snapshot before new, in new's filesystem (or its origin). If not then 2746 * fail and return EINVAL. 2747 * 2748 * The written space is calculated by considering two components: First, we 2749 * ignore any freed space, and calculate the written as new's used space 2750 * minus old's used space. Next, we add in the amount of space that was freed 2751 * between the two snapshots, thus reducing new's used space relative to old's. 2752 * Specifically, this is the space that was born before old->ds_creation_txg, 2753 * and freed before new (ie. on new's deadlist or a previous deadlist). 2754 * 2755 * space freed [---------------------] 2756 * snapshots ---O-------O--------O-------O------ 2757 * oldsnap new 2758 */ 2759 int 2760 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 2761 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 2762 { 2763 int err = 0; 2764 uint64_t snapobj; 2765 dsl_pool_t *dp = new->ds_dir->dd_pool; 2766 2767 ASSERT(dsl_pool_config_held(dp)); 2768 2769 *usedp = 0; 2770 *usedp += new->ds_phys->ds_referenced_bytes; 2771 *usedp -= oldsnap->ds_phys->ds_referenced_bytes; 2772 2773 *compp = 0; 2774 *compp += new->ds_phys->ds_compressed_bytes; 2775 *compp -= oldsnap->ds_phys->ds_compressed_bytes; 2776 2777 *uncompp = 0; 2778 *uncompp += new->ds_phys->ds_uncompressed_bytes; 2779 *uncompp -= oldsnap->ds_phys->ds_uncompressed_bytes; 2780 2781 snapobj = new->ds_object; 2782 while (snapobj != oldsnap->ds_object) { 2783 dsl_dataset_t *snap; 2784 uint64_t used, comp, uncomp; 2785 2786 if (snapobj == new->ds_object) { 2787 snap = new; 2788 } else { 2789 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 2790 if (err != 0) 2791 break; 2792 } 2793 2794 if (snap->ds_phys->ds_prev_snap_txg == 2795 oldsnap->ds_phys->ds_creation_txg) { 2796 /* 2797 * The blocks in the deadlist can not be born after 2798 * ds_prev_snap_txg, so get the whole deadlist space, 2799 * which is more efficient (especially for old-format 2800 * deadlists). Unfortunately the deadlist code 2801 * doesn't have enough information to make this 2802 * optimization itself. 2803 */ 2804 dsl_deadlist_space(&snap->ds_deadlist, 2805 &used, &comp, &uncomp); 2806 } else { 2807 dsl_deadlist_space_range(&snap->ds_deadlist, 2808 0, oldsnap->ds_phys->ds_creation_txg, 2809 &used, &comp, &uncomp); 2810 } 2811 *usedp += used; 2812 *compp += comp; 2813 *uncompp += uncomp; 2814 2815 /* 2816 * If we get to the beginning of the chain of snapshots 2817 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 2818 * was not a snapshot of/before new. 2819 */ 2820 snapobj = snap->ds_phys->ds_prev_snap_obj; 2821 if (snap != new) 2822 dsl_dataset_rele(snap, FTAG); 2823 if (snapobj == 0) { 2824 err = SET_ERROR(EINVAL); 2825 break; 2826 } 2827 2828 } 2829 return (err); 2830 } 2831 2832 /* 2833 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 2834 * lastsnap, and all snapshots in between are deleted. 2835 * 2836 * blocks that would be freed [---------------------------] 2837 * snapshots ---O-------O--------O-------O--------O 2838 * firstsnap lastsnap 2839 * 2840 * This is the set of blocks that were born after the snap before firstsnap, 2841 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 2842 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 2843 * We calculate this by iterating over the relevant deadlists (from the snap 2844 * after lastsnap, backward to the snap after firstsnap), summing up the 2845 * space on the deadlist that was born after the snap before firstsnap. 2846 */ 2847 int 2848 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 2849 dsl_dataset_t *lastsnap, 2850 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 2851 { 2852 int err = 0; 2853 uint64_t snapobj; 2854 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 2855 2856 ASSERT(dsl_dataset_is_snapshot(firstsnap)); 2857 ASSERT(dsl_dataset_is_snapshot(lastsnap)); 2858 2859 /* 2860 * Check that the snapshots are in the same dsl_dir, and firstsnap 2861 * is before lastsnap. 2862 */ 2863 if (firstsnap->ds_dir != lastsnap->ds_dir || 2864 firstsnap->ds_phys->ds_creation_txg > 2865 lastsnap->ds_phys->ds_creation_txg) 2866 return (SET_ERROR(EINVAL)); 2867 2868 *usedp = *compp = *uncompp = 0; 2869 2870 snapobj = lastsnap->ds_phys->ds_next_snap_obj; 2871 while (snapobj != firstsnap->ds_object) { 2872 dsl_dataset_t *ds; 2873 uint64_t used, comp, uncomp; 2874 2875 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 2876 if (err != 0) 2877 break; 2878 2879 dsl_deadlist_space_range(&ds->ds_deadlist, 2880 firstsnap->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2881 &used, &comp, &uncomp); 2882 *usedp += used; 2883 *compp += comp; 2884 *uncompp += uncomp; 2885 2886 snapobj = ds->ds_phys->ds_prev_snap_obj; 2887 ASSERT3U(snapobj, !=, 0); 2888 dsl_dataset_rele(ds, FTAG); 2889 } 2890 return (err); 2891 } 2892 2893 /* 2894 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 2895 * For example, they could both be snapshots of the same filesystem, and 2896 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 2897 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 2898 * filesystem. Or 'earlier' could be the origin's origin. 2899 */ 2900 boolean_t 2901 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier) 2902 { 2903 dsl_pool_t *dp = later->ds_dir->dd_pool; 2904 int error; 2905 boolean_t ret; 2906 2907 ASSERT(dsl_pool_config_held(dp)); 2908 2909 if (earlier->ds_phys->ds_creation_txg >= 2910 later->ds_phys->ds_creation_txg) 2911 return (B_FALSE); 2912 2913 if (later->ds_dir == earlier->ds_dir) 2914 return (B_TRUE); 2915 if (!dsl_dir_is_clone(later->ds_dir)) 2916 return (B_FALSE); 2917 2918 if (later->ds_dir->dd_phys->dd_origin_obj == earlier->ds_object) 2919 return (B_TRUE); 2920 dsl_dataset_t *origin; 2921 error = dsl_dataset_hold_obj(dp, 2922 later->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin); 2923 if (error != 0) 2924 return (B_FALSE); 2925 ret = dsl_dataset_is_before(origin, earlier); 2926 dsl_dataset_rele(origin, FTAG); 2927 return (ret); 2928 } 2929