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) 2011, 2014 by Delphix. All rights reserved. 24 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 25 * Copyright (c) 2014 RackTop Systems. 26 */ 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_impl.h> 35 #include <sys/dmu_tx.h> 36 #include <sys/arc.h> 37 #include <sys/zio.h> 38 #include <sys/zap.h> 39 #include <sys/zfeature.h> 40 #include <sys/unique.h> 41 #include <sys/zfs_context.h> 42 #include <sys/zfs_ioctl.h> 43 #include <sys/spa.h> 44 #include <sys/zfs_znode.h> 45 #include <sys/zfs_onexit.h> 46 #include <sys/zvol.h> 47 #include <sys/dsl_scan.h> 48 #include <sys/dsl_deadlist.h> 49 #include <sys/dsl_destroy.h> 50 #include <sys/dsl_userhold.h> 51 #include <sys/dsl_bookmark.h> 52 53 /* 54 * The SPA supports block sizes up to 16MB. However, very large blocks 55 * can have an impact on i/o latency (e.g. tying up a spinning disk for 56 * ~300ms), and also potentially on the memory allocator. Therefore, 57 * we do not allow the recordsize to be set larger than zfs_max_recordsize 58 * (default 1MB). Larger blocks can be created by changing this tunable, 59 * and pools with larger blocks can always be imported and used, regardless 60 * of this setting. 61 */ 62 int zfs_max_recordsize = 1 * 1024 * 1024; 63 64 #define SWITCH64(x, y) \ 65 { \ 66 uint64_t __tmp = (x); \ 67 (x) = (y); \ 68 (y) = __tmp; \ 69 } 70 71 #define DS_REF_MAX (1ULL << 62) 72 73 /* 74 * Figure out how much of this delta should be propogated to the dsl_dir 75 * layer. If there's a refreservation, that space has already been 76 * partially accounted for in our ancestors. 77 */ 78 static int64_t 79 parent_delta(dsl_dataset_t *ds, int64_t delta) 80 { 81 uint64_t old_bytes, new_bytes; 82 83 if (ds->ds_reserved == 0) 84 return (delta); 85 86 old_bytes = MAX(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 87 new_bytes = MAX(ds->ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 88 89 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 90 return (new_bytes - old_bytes); 91 } 92 93 void 94 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 95 { 96 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 97 int compressed = BP_GET_PSIZE(bp); 98 int uncompressed = BP_GET_UCSIZE(bp); 99 int64_t delta; 100 101 dprintf_bp(bp, "ds=%p", ds); 102 103 ASSERT(dmu_tx_is_syncing(tx)); 104 /* It could have been compressed away to nothing */ 105 if (BP_IS_HOLE(bp)) 106 return; 107 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 108 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 109 if (ds == NULL) { 110 dsl_pool_mos_diduse_space(tx->tx_pool, 111 used, compressed, uncompressed); 112 return; 113 } 114 115 dmu_buf_will_dirty(ds->ds_dbuf, tx); 116 mutex_enter(&ds->ds_lock); 117 delta = parent_delta(ds, used); 118 ds->ds_phys->ds_referenced_bytes += used; 119 ds->ds_phys->ds_compressed_bytes += compressed; 120 ds->ds_phys->ds_uncompressed_bytes += uncompressed; 121 ds->ds_phys->ds_unique_bytes += used; 122 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) 123 ds->ds_need_large_blocks = B_TRUE; 124 mutex_exit(&ds->ds_lock); 125 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 126 compressed, uncompressed, tx); 127 dsl_dir_transfer_space(ds->ds_dir, used - delta, 128 DD_USED_REFRSRV, DD_USED_HEAD, tx); 129 } 130 131 int 132 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 133 boolean_t async) 134 { 135 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 136 int compressed = BP_GET_PSIZE(bp); 137 int uncompressed = BP_GET_UCSIZE(bp); 138 139 if (BP_IS_HOLE(bp)) 140 return (0); 141 142 ASSERT(dmu_tx_is_syncing(tx)); 143 ASSERT(bp->blk_birth <= tx->tx_txg); 144 145 if (ds == NULL) { 146 dsl_free(tx->tx_pool, tx->tx_txg, bp); 147 dsl_pool_mos_diduse_space(tx->tx_pool, 148 -used, -compressed, -uncompressed); 149 return (used); 150 } 151 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 152 153 ASSERT(!dsl_dataset_is_snapshot(ds)); 154 dmu_buf_will_dirty(ds->ds_dbuf, tx); 155 156 if (bp->blk_birth > ds->ds_phys->ds_prev_snap_txg) { 157 int64_t delta; 158 159 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 160 dsl_free(tx->tx_pool, tx->tx_txg, bp); 161 162 mutex_enter(&ds->ds_lock); 163 ASSERT(ds->ds_phys->ds_unique_bytes >= used || 164 !DS_UNIQUE_IS_ACCURATE(ds)); 165 delta = parent_delta(ds, -used); 166 ds->ds_phys->ds_unique_bytes -= used; 167 mutex_exit(&ds->ds_lock); 168 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 169 delta, -compressed, -uncompressed, tx); 170 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 171 DD_USED_REFRSRV, DD_USED_HEAD, tx); 172 } else { 173 dprintf_bp(bp, "putting on dead list: %s", ""); 174 if (async) { 175 /* 176 * We are here as part of zio's write done callback, 177 * which means we're a zio interrupt thread. We can't 178 * call dsl_deadlist_insert() now because it may block 179 * waiting for I/O. Instead, put bp on the deferred 180 * queue and let dsl_pool_sync() finish the job. 181 */ 182 bplist_append(&ds->ds_pending_deadlist, bp); 183 } else { 184 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 185 } 186 ASSERT3U(ds->ds_prev->ds_object, ==, 187 ds->ds_phys->ds_prev_snap_obj); 188 ASSERT(ds->ds_prev->ds_phys->ds_num_children > 0); 189 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 190 if (ds->ds_prev->ds_phys->ds_next_snap_obj == 191 ds->ds_object && bp->blk_birth > 192 ds->ds_prev->ds_phys->ds_prev_snap_txg) { 193 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 194 mutex_enter(&ds->ds_prev->ds_lock); 195 ds->ds_prev->ds_phys->ds_unique_bytes += used; 196 mutex_exit(&ds->ds_prev->ds_lock); 197 } 198 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 199 dsl_dir_transfer_space(ds->ds_dir, used, 200 DD_USED_HEAD, DD_USED_SNAP, tx); 201 } 202 } 203 mutex_enter(&ds->ds_lock); 204 ASSERT3U(ds->ds_phys->ds_referenced_bytes, >=, used); 205 ds->ds_phys->ds_referenced_bytes -= used; 206 ASSERT3U(ds->ds_phys->ds_compressed_bytes, >=, compressed); 207 ds->ds_phys->ds_compressed_bytes -= compressed; 208 ASSERT3U(ds->ds_phys->ds_uncompressed_bytes, >=, uncompressed); 209 ds->ds_phys->ds_uncompressed_bytes -= uncompressed; 210 mutex_exit(&ds->ds_lock); 211 212 return (used); 213 } 214 215 uint64_t 216 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 217 { 218 uint64_t trysnap = 0; 219 220 if (ds == NULL) 221 return (0); 222 /* 223 * The snapshot creation could fail, but that would cause an 224 * incorrect FALSE return, which would only result in an 225 * overestimation of the amount of space that an operation would 226 * consume, which is OK. 227 * 228 * There's also a small window where we could miss a pending 229 * snapshot, because we could set the sync task in the quiescing 230 * phase. So this should only be used as a guess. 231 */ 232 if (ds->ds_trysnap_txg > 233 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 234 trysnap = ds->ds_trysnap_txg; 235 return (MAX(ds->ds_phys->ds_prev_snap_txg, trysnap)); 236 } 237 238 boolean_t 239 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 240 uint64_t blk_birth) 241 { 242 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 243 (bp != NULL && BP_IS_HOLE(bp))) 244 return (B_FALSE); 245 246 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 247 248 return (B_TRUE); 249 } 250 251 /* ARGSUSED */ 252 static void 253 dsl_dataset_evict(dmu_buf_t *db, void *dsv) 254 { 255 dsl_dataset_t *ds = dsv; 256 257 ASSERT(ds->ds_owner == NULL); 258 259 unique_remove(ds->ds_fsid_guid); 260 261 if (ds->ds_objset != NULL) 262 dmu_objset_evict(ds->ds_objset); 263 264 if (ds->ds_prev) { 265 dsl_dataset_rele(ds->ds_prev, ds); 266 ds->ds_prev = NULL; 267 } 268 269 bplist_destroy(&ds->ds_pending_deadlist); 270 if (ds->ds_phys->ds_deadlist_obj != 0) 271 dsl_deadlist_close(&ds->ds_deadlist); 272 if (ds->ds_dir) 273 dsl_dir_rele(ds->ds_dir, ds); 274 275 ASSERT(!list_link_active(&ds->ds_synced_link)); 276 277 mutex_destroy(&ds->ds_lock); 278 mutex_destroy(&ds->ds_opening_lock); 279 mutex_destroy(&ds->ds_sendstream_lock); 280 refcount_destroy(&ds->ds_longholds); 281 282 kmem_free(ds, sizeof (dsl_dataset_t)); 283 } 284 285 int 286 dsl_dataset_get_snapname(dsl_dataset_t *ds) 287 { 288 dsl_dataset_phys_t *headphys; 289 int err; 290 dmu_buf_t *headdbuf; 291 dsl_pool_t *dp = ds->ds_dir->dd_pool; 292 objset_t *mos = dp->dp_meta_objset; 293 294 if (ds->ds_snapname[0]) 295 return (0); 296 if (ds->ds_phys->ds_next_snap_obj == 0) 297 return (0); 298 299 err = dmu_bonus_hold(mos, ds->ds_dir->dd_phys->dd_head_dataset_obj, 300 FTAG, &headdbuf); 301 if (err != 0) 302 return (err); 303 headphys = headdbuf->db_data; 304 err = zap_value_search(dp->dp_meta_objset, 305 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 306 dmu_buf_rele(headdbuf, FTAG); 307 return (err); 308 } 309 310 int 311 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 312 { 313 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 314 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 315 matchtype_t mt; 316 int err; 317 318 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 319 mt = MT_FIRST; 320 else 321 mt = MT_EXACT; 322 323 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 324 value, mt, NULL, 0, NULL); 325 if (err == ENOTSUP && mt == MT_FIRST) 326 err = zap_lookup(mos, snapobj, name, 8, 1, value); 327 return (err); 328 } 329 330 int 331 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 332 boolean_t adj_cnt) 333 { 334 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 335 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 336 matchtype_t mt; 337 int err; 338 339 dsl_dir_snap_cmtime_update(ds->ds_dir); 340 341 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 342 mt = MT_FIRST; 343 else 344 mt = MT_EXACT; 345 346 err = zap_remove_norm(mos, snapobj, name, mt, tx); 347 if (err == ENOTSUP && mt == MT_FIRST) 348 err = zap_remove(mos, snapobj, name, tx); 349 350 if (err == 0 && adj_cnt) 351 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 352 DD_FIELD_SNAPSHOT_COUNT, tx); 353 354 return (err); 355 } 356 357 int 358 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 359 dsl_dataset_t **dsp) 360 { 361 objset_t *mos = dp->dp_meta_objset; 362 dmu_buf_t *dbuf; 363 dsl_dataset_t *ds; 364 int err; 365 dmu_object_info_t doi; 366 367 ASSERT(dsl_pool_config_held(dp)); 368 369 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 370 if (err != 0) 371 return (err); 372 373 /* Make sure dsobj has the correct object type. */ 374 dmu_object_info_from_db(dbuf, &doi); 375 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 376 dmu_buf_rele(dbuf, tag); 377 return (SET_ERROR(EINVAL)); 378 } 379 380 ds = dmu_buf_get_user(dbuf); 381 if (ds == NULL) { 382 dsl_dataset_t *winner = NULL; 383 384 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 385 ds->ds_dbuf = dbuf; 386 ds->ds_object = dsobj; 387 ds->ds_phys = dbuf->db_data; 388 389 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 390 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 391 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 392 refcount_create(&ds->ds_longholds); 393 394 bplist_create(&ds->ds_pending_deadlist); 395 dsl_deadlist_open(&ds->ds_deadlist, 396 mos, ds->ds_phys->ds_deadlist_obj); 397 398 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 399 offsetof(dmu_sendarg_t, dsa_link)); 400 401 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 402 err = zap_contains(mos, dsobj, DS_FIELD_LARGE_BLOCKS); 403 if (err == 0) 404 ds->ds_large_blocks = B_TRUE; 405 else 406 ASSERT3U(err, ==, ENOENT); 407 } 408 409 if (err == 0) { 410 err = dsl_dir_hold_obj(dp, 411 ds->ds_phys->ds_dir_obj, NULL, ds, &ds->ds_dir); 412 } 413 if (err != 0) { 414 mutex_destroy(&ds->ds_lock); 415 mutex_destroy(&ds->ds_opening_lock); 416 mutex_destroy(&ds->ds_sendstream_lock); 417 refcount_destroy(&ds->ds_longholds); 418 bplist_destroy(&ds->ds_pending_deadlist); 419 dsl_deadlist_close(&ds->ds_deadlist); 420 kmem_free(ds, sizeof (dsl_dataset_t)); 421 dmu_buf_rele(dbuf, tag); 422 return (err); 423 } 424 425 if (!dsl_dataset_is_snapshot(ds)) { 426 ds->ds_snapname[0] = '\0'; 427 if (ds->ds_phys->ds_prev_snap_obj != 0) { 428 err = dsl_dataset_hold_obj(dp, 429 ds->ds_phys->ds_prev_snap_obj, 430 ds, &ds->ds_prev); 431 } 432 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 433 int zaperr = zap_lookup(mos, ds->ds_object, 434 DS_FIELD_BOOKMARK_NAMES, 435 sizeof (ds->ds_bookmarks), 1, 436 &ds->ds_bookmarks); 437 if (zaperr != ENOENT) 438 VERIFY0(zaperr); 439 } 440 } else { 441 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 442 err = dsl_dataset_get_snapname(ds); 443 if (err == 0 && ds->ds_phys->ds_userrefs_obj != 0) { 444 err = zap_count( 445 ds->ds_dir->dd_pool->dp_meta_objset, 446 ds->ds_phys->ds_userrefs_obj, 447 &ds->ds_userrefs); 448 } 449 } 450 451 if (err == 0 && !dsl_dataset_is_snapshot(ds)) { 452 err = dsl_prop_get_int_ds(ds, 453 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 454 &ds->ds_reserved); 455 if (err == 0) { 456 err = dsl_prop_get_int_ds(ds, 457 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 458 &ds->ds_quota); 459 } 460 } else { 461 ds->ds_reserved = ds->ds_quota = 0; 462 } 463 464 if (err != 0 || (winner = dmu_buf_set_user_ie(dbuf, ds, 465 &ds->ds_phys, dsl_dataset_evict)) != NULL) { 466 bplist_destroy(&ds->ds_pending_deadlist); 467 dsl_deadlist_close(&ds->ds_deadlist); 468 if (ds->ds_prev) 469 dsl_dataset_rele(ds->ds_prev, ds); 470 dsl_dir_rele(ds->ds_dir, ds); 471 mutex_destroy(&ds->ds_lock); 472 mutex_destroy(&ds->ds_opening_lock); 473 mutex_destroy(&ds->ds_sendstream_lock); 474 refcount_destroy(&ds->ds_longholds); 475 kmem_free(ds, sizeof (dsl_dataset_t)); 476 if (err != 0) { 477 dmu_buf_rele(dbuf, tag); 478 return (err); 479 } 480 ds = winner; 481 } else { 482 ds->ds_fsid_guid = 483 unique_insert(ds->ds_phys->ds_fsid_guid); 484 } 485 } 486 ASSERT3P(ds->ds_dbuf, ==, dbuf); 487 ASSERT3P(ds->ds_phys, ==, dbuf->db_data); 488 ASSERT(ds->ds_phys->ds_prev_snap_obj != 0 || 489 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 490 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 491 *dsp = ds; 492 return (0); 493 } 494 495 int 496 dsl_dataset_hold(dsl_pool_t *dp, const char *name, 497 void *tag, dsl_dataset_t **dsp) 498 { 499 dsl_dir_t *dd; 500 const char *snapname; 501 uint64_t obj; 502 int err = 0; 503 504 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 505 if (err != 0) 506 return (err); 507 508 ASSERT(dsl_pool_config_held(dp)); 509 obj = dd->dd_phys->dd_head_dataset_obj; 510 if (obj != 0) 511 err = dsl_dataset_hold_obj(dp, obj, tag, dsp); 512 else 513 err = SET_ERROR(ENOENT); 514 515 /* we may be looking for a snapshot */ 516 if (err == 0 && snapname != NULL) { 517 dsl_dataset_t *ds; 518 519 if (*snapname++ != '@') { 520 dsl_dataset_rele(*dsp, tag); 521 dsl_dir_rele(dd, FTAG); 522 return (SET_ERROR(ENOENT)); 523 } 524 525 dprintf("looking for snapshot '%s'\n", snapname); 526 err = dsl_dataset_snap_lookup(*dsp, snapname, &obj); 527 if (err == 0) 528 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 529 dsl_dataset_rele(*dsp, tag); 530 531 if (err == 0) { 532 mutex_enter(&ds->ds_lock); 533 if (ds->ds_snapname[0] == 0) 534 (void) strlcpy(ds->ds_snapname, snapname, 535 sizeof (ds->ds_snapname)); 536 mutex_exit(&ds->ds_lock); 537 *dsp = ds; 538 } 539 } 540 541 dsl_dir_rele(dd, FTAG); 542 return (err); 543 } 544 545 int 546 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 547 void *tag, dsl_dataset_t **dsp) 548 { 549 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 550 if (err != 0) 551 return (err); 552 if (!dsl_dataset_tryown(*dsp, tag)) { 553 dsl_dataset_rele(*dsp, tag); 554 *dsp = NULL; 555 return (SET_ERROR(EBUSY)); 556 } 557 return (0); 558 } 559 560 int 561 dsl_dataset_own(dsl_pool_t *dp, const char *name, 562 void *tag, dsl_dataset_t **dsp) 563 { 564 int err = dsl_dataset_hold(dp, name, tag, dsp); 565 if (err != 0) 566 return (err); 567 if (!dsl_dataset_tryown(*dsp, tag)) { 568 dsl_dataset_rele(*dsp, tag); 569 return (SET_ERROR(EBUSY)); 570 } 571 return (0); 572 } 573 574 /* 575 * See the comment above dsl_pool_hold() for details. In summary, a long 576 * hold is used to prevent destruction of a dataset while the pool hold 577 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 578 * 579 * The dataset and pool must be held when this function is called. After it 580 * is called, the pool hold may be released while the dataset is still held 581 * and accessed. 582 */ 583 void 584 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 585 { 586 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 587 (void) refcount_add(&ds->ds_longholds, tag); 588 } 589 590 void 591 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 592 { 593 (void) refcount_remove(&ds->ds_longholds, tag); 594 } 595 596 /* Return B_TRUE if there are any long holds on this dataset. */ 597 boolean_t 598 dsl_dataset_long_held(dsl_dataset_t *ds) 599 { 600 return (!refcount_is_zero(&ds->ds_longholds)); 601 } 602 603 void 604 dsl_dataset_name(dsl_dataset_t *ds, char *name) 605 { 606 if (ds == NULL) { 607 (void) strcpy(name, "mos"); 608 } else { 609 dsl_dir_name(ds->ds_dir, name); 610 VERIFY0(dsl_dataset_get_snapname(ds)); 611 if (ds->ds_snapname[0]) { 612 (void) strcat(name, "@"); 613 /* 614 * We use a "recursive" mutex so that we 615 * can call dprintf_ds() with ds_lock held. 616 */ 617 if (!MUTEX_HELD(&ds->ds_lock)) { 618 mutex_enter(&ds->ds_lock); 619 (void) strcat(name, ds->ds_snapname); 620 mutex_exit(&ds->ds_lock); 621 } else { 622 (void) strcat(name, ds->ds_snapname); 623 } 624 } 625 } 626 } 627 628 void 629 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 630 { 631 dmu_buf_rele(ds->ds_dbuf, tag); 632 } 633 634 void 635 dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 636 { 637 ASSERT3P(ds->ds_owner, ==, tag); 638 ASSERT(ds->ds_dbuf != NULL); 639 640 mutex_enter(&ds->ds_lock); 641 ds->ds_owner = NULL; 642 mutex_exit(&ds->ds_lock); 643 dsl_dataset_long_rele(ds, tag); 644 dsl_dataset_rele(ds, tag); 645 } 646 647 boolean_t 648 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 649 { 650 boolean_t gotit = FALSE; 651 652 mutex_enter(&ds->ds_lock); 653 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 654 ds->ds_owner = tag; 655 dsl_dataset_long_hold(ds, tag); 656 gotit = TRUE; 657 } 658 mutex_exit(&ds->ds_lock); 659 return (gotit); 660 } 661 662 uint64_t 663 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 664 uint64_t flags, dmu_tx_t *tx) 665 { 666 dsl_pool_t *dp = dd->dd_pool; 667 dmu_buf_t *dbuf; 668 dsl_dataset_phys_t *dsphys; 669 uint64_t dsobj; 670 objset_t *mos = dp->dp_meta_objset; 671 672 if (origin == NULL) 673 origin = dp->dp_origin_snap; 674 675 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 676 ASSERT(origin == NULL || origin->ds_phys->ds_num_children > 0); 677 ASSERT(dmu_tx_is_syncing(tx)); 678 ASSERT(dd->dd_phys->dd_head_dataset_obj == 0); 679 680 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 681 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 682 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 683 dmu_buf_will_dirty(dbuf, tx); 684 dsphys = dbuf->db_data; 685 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 686 dsphys->ds_dir_obj = dd->dd_object; 687 dsphys->ds_flags = flags; 688 dsphys->ds_fsid_guid = unique_create(); 689 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 690 sizeof (dsphys->ds_guid)); 691 dsphys->ds_snapnames_zapobj = 692 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 693 DMU_OT_NONE, 0, tx); 694 dsphys->ds_creation_time = gethrestime_sec(); 695 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 696 697 if (origin == NULL) { 698 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 699 } else { 700 dsl_dataset_t *ohds; /* head of the origin snapshot */ 701 702 dsphys->ds_prev_snap_obj = origin->ds_object; 703 dsphys->ds_prev_snap_txg = 704 origin->ds_phys->ds_creation_txg; 705 dsphys->ds_referenced_bytes = 706 origin->ds_phys->ds_referenced_bytes; 707 dsphys->ds_compressed_bytes = 708 origin->ds_phys->ds_compressed_bytes; 709 dsphys->ds_uncompressed_bytes = 710 origin->ds_phys->ds_uncompressed_bytes; 711 dsphys->ds_bp = origin->ds_phys->ds_bp; 712 713 /* 714 * Inherit flags that describe the dataset's contents 715 * (INCONSISTENT) or properties (Case Insensitive). 716 */ 717 dsphys->ds_flags |= origin->ds_phys->ds_flags & 718 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 719 720 if (origin->ds_large_blocks) 721 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); 722 723 dmu_buf_will_dirty(origin->ds_dbuf, tx); 724 origin->ds_phys->ds_num_children++; 725 726 VERIFY0(dsl_dataset_hold_obj(dp, 727 origin->ds_dir->dd_phys->dd_head_dataset_obj, FTAG, &ohds)); 728 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 729 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 730 dsl_dataset_rele(ohds, FTAG); 731 732 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 733 if (origin->ds_phys->ds_next_clones_obj == 0) { 734 origin->ds_phys->ds_next_clones_obj = 735 zap_create(mos, 736 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 737 } 738 VERIFY0(zap_add_int(mos, 739 origin->ds_phys->ds_next_clones_obj, dsobj, tx)); 740 } 741 742 dmu_buf_will_dirty(dd->dd_dbuf, tx); 743 dd->dd_phys->dd_origin_obj = origin->ds_object; 744 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 745 if (origin->ds_dir->dd_phys->dd_clones == 0) { 746 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 747 origin->ds_dir->dd_phys->dd_clones = 748 zap_create(mos, 749 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 750 } 751 VERIFY0(zap_add_int(mos, 752 origin->ds_dir->dd_phys->dd_clones, dsobj, tx)); 753 } 754 } 755 756 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 757 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 758 759 dmu_buf_rele(dbuf, FTAG); 760 761 dmu_buf_will_dirty(dd->dd_dbuf, tx); 762 dd->dd_phys->dd_head_dataset_obj = dsobj; 763 764 return (dsobj); 765 } 766 767 static void 768 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 769 { 770 objset_t *os; 771 772 VERIFY0(dmu_objset_from_ds(ds, &os)); 773 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 774 dsl_dataset_dirty(ds, tx); 775 } 776 777 uint64_t 778 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 779 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 780 { 781 dsl_pool_t *dp = pdd->dd_pool; 782 uint64_t dsobj, ddobj; 783 dsl_dir_t *dd; 784 785 ASSERT(dmu_tx_is_syncing(tx)); 786 ASSERT(lastname[0] != '@'); 787 788 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 789 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 790 791 dsobj = dsl_dataset_create_sync_dd(dd, origin, 792 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 793 794 dsl_deleg_set_create_perms(dd, tx, cr); 795 796 /* 797 * Since we're creating a new node we know it's a leaf, so we can 798 * initialize the counts if the limit feature is active. 799 */ 800 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 801 uint64_t cnt = 0; 802 objset_t *os = dd->dd_pool->dp_meta_objset; 803 804 dsl_dir_zapify(dd, tx); 805 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 806 sizeof (cnt), 1, &cnt, tx)); 807 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 808 sizeof (cnt), 1, &cnt, tx)); 809 } 810 811 dsl_dir_rele(dd, FTAG); 812 813 /* 814 * If we are creating a clone, make sure we zero out any stale 815 * data from the origin snapshots zil header. 816 */ 817 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 818 dsl_dataset_t *ds; 819 820 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 821 dsl_dataset_zero_zil(ds, tx); 822 dsl_dataset_rele(ds, FTAG); 823 } 824 825 return (dsobj); 826 } 827 828 /* 829 * The unique space in the head dataset can be calculated by subtracting 830 * the space used in the most recent snapshot, that is still being used 831 * in this file system, from the space currently in use. To figure out 832 * the space in the most recent snapshot still in use, we need to take 833 * the total space used in the snapshot and subtract out the space that 834 * has been freed up since the snapshot was taken. 835 */ 836 void 837 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 838 { 839 uint64_t mrs_used; 840 uint64_t dlused, dlcomp, dluncomp; 841 842 ASSERT(!dsl_dataset_is_snapshot(ds)); 843 844 if (ds->ds_phys->ds_prev_snap_obj != 0) 845 mrs_used = ds->ds_prev->ds_phys->ds_referenced_bytes; 846 else 847 mrs_used = 0; 848 849 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 850 851 ASSERT3U(dlused, <=, mrs_used); 852 ds->ds_phys->ds_unique_bytes = 853 ds->ds_phys->ds_referenced_bytes - (mrs_used - dlused); 854 855 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 856 SPA_VERSION_UNIQUE_ACCURATE) 857 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 858 } 859 860 void 861 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 862 dmu_tx_t *tx) 863 { 864 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 865 uint64_t count; 866 int err; 867 868 ASSERT(ds->ds_phys->ds_num_children >= 2); 869 err = zap_remove_int(mos, ds->ds_phys->ds_next_clones_obj, obj, tx); 870 /* 871 * The err should not be ENOENT, but a bug in a previous version 872 * of the code could cause upgrade_clones_cb() to not set 873 * ds_next_snap_obj when it should, leading to a missing entry. 874 * If we knew that the pool was created after 875 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 876 * ENOENT. However, at least we can check that we don't have 877 * too many entries in the next_clones_obj even after failing to 878 * remove this one. 879 */ 880 if (err != ENOENT) 881 VERIFY0(err); 882 ASSERT0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 883 &count)); 884 ASSERT3U(count, <=, ds->ds_phys->ds_num_children - 2); 885 } 886 887 888 blkptr_t * 889 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 890 { 891 return (&ds->ds_phys->ds_bp); 892 } 893 894 void 895 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 896 { 897 ASSERT(dmu_tx_is_syncing(tx)); 898 /* If it's the meta-objset, set dp_meta_rootbp */ 899 if (ds == NULL) { 900 tx->tx_pool->dp_meta_rootbp = *bp; 901 } else { 902 dmu_buf_will_dirty(ds->ds_dbuf, tx); 903 ds->ds_phys->ds_bp = *bp; 904 } 905 } 906 907 spa_t * 908 dsl_dataset_get_spa(dsl_dataset_t *ds) 909 { 910 return (ds->ds_dir->dd_pool->dp_spa); 911 } 912 913 void 914 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 915 { 916 dsl_pool_t *dp; 917 918 if (ds == NULL) /* this is the meta-objset */ 919 return; 920 921 ASSERT(ds->ds_objset != NULL); 922 923 if (ds->ds_phys->ds_next_snap_obj != 0) 924 panic("dirtying snapshot!"); 925 926 dp = ds->ds_dir->dd_pool; 927 928 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 929 /* up the hold count until we can be written out */ 930 dmu_buf_add_ref(ds->ds_dbuf, ds); 931 } 932 } 933 934 boolean_t 935 dsl_dataset_is_dirty(dsl_dataset_t *ds) 936 { 937 for (int t = 0; t < TXG_SIZE; t++) { 938 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 939 ds, t)) 940 return (B_TRUE); 941 } 942 return (B_FALSE); 943 } 944 945 static int 946 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 947 { 948 uint64_t asize; 949 950 if (!dmu_tx_is_syncing(tx)) 951 return (0); 952 953 /* 954 * If there's an fs-only reservation, any blocks that might become 955 * owned by the snapshot dataset must be accommodated by space 956 * outside of the reservation. 957 */ 958 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 959 asize = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 960 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 961 return (SET_ERROR(ENOSPC)); 962 963 /* 964 * Propagate any reserved space for this snapshot to other 965 * snapshot checks in this sync group. 966 */ 967 if (asize > 0) 968 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 969 970 return (0); 971 } 972 973 typedef struct dsl_dataset_snapshot_arg { 974 nvlist_t *ddsa_snaps; 975 nvlist_t *ddsa_props; 976 nvlist_t *ddsa_errors; 977 cred_t *ddsa_cr; 978 } dsl_dataset_snapshot_arg_t; 979 980 int 981 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 982 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 983 { 984 int error; 985 uint64_t value; 986 987 ds->ds_trysnap_txg = tx->tx_txg; 988 989 if (!dmu_tx_is_syncing(tx)) 990 return (0); 991 992 /* 993 * We don't allow multiple snapshots of the same txg. If there 994 * is already one, try again. 995 */ 996 if (ds->ds_phys->ds_prev_snap_txg >= tx->tx_txg) 997 return (SET_ERROR(EAGAIN)); 998 999 /* 1000 * Check for conflicting snapshot name. 1001 */ 1002 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1003 if (error == 0) 1004 return (SET_ERROR(EEXIST)); 1005 if (error != ENOENT) 1006 return (error); 1007 1008 /* 1009 * We don't allow taking snapshots of inconsistent datasets, such as 1010 * those into which we are currently receiving. However, if we are 1011 * creating this snapshot as part of a receive, this check will be 1012 * executed atomically with respect to the completion of the receive 1013 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1014 * case we ignore this, knowing it will be fixed up for us shortly in 1015 * dmu_recv_end_sync(). 1016 */ 1017 if (!recv && DS_IS_INCONSISTENT(ds)) 1018 return (SET_ERROR(EBUSY)); 1019 1020 /* 1021 * Skip the check for temporary snapshots or if we have already checked 1022 * the counts in dsl_dataset_snapshot_check. This means we really only 1023 * check the count here when we're receiving a stream. 1024 */ 1025 if (cnt != 0 && cr != NULL) { 1026 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1027 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1028 if (error != 0) 1029 return (error); 1030 } 1031 1032 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1033 if (error != 0) 1034 return (error); 1035 1036 return (0); 1037 } 1038 1039 static int 1040 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1041 { 1042 dsl_dataset_snapshot_arg_t *ddsa = arg; 1043 dsl_pool_t *dp = dmu_tx_pool(tx); 1044 nvpair_t *pair; 1045 int rv = 0; 1046 1047 /* 1048 * Pre-compute how many total new snapshots will be created for each 1049 * level in the tree and below. This is needed for validating the 1050 * snapshot limit when either taking a recursive snapshot or when 1051 * taking multiple snapshots. 1052 * 1053 * The problem is that the counts are not actually adjusted when 1054 * we are checking, only when we finally sync. For a single snapshot, 1055 * this is easy, the count will increase by 1 at each node up the tree, 1056 * but its more complicated for the recursive/multiple snapshot case. 1057 * 1058 * The dsl_fs_ss_limit_check function does recursively check the count 1059 * at each level up the tree but since it is validating each snapshot 1060 * independently we need to be sure that we are validating the complete 1061 * count for the entire set of snapshots. We do this by rolling up the 1062 * counts for each component of the name into an nvlist and then 1063 * checking each of those cases with the aggregated count. 1064 * 1065 * This approach properly handles not only the recursive snapshot 1066 * case (where we get all of those on the ddsa_snaps list) but also 1067 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1068 * validate the limit on 'a' using a count of 2). 1069 * 1070 * We validate the snapshot names in the third loop and only report 1071 * name errors once. 1072 */ 1073 if (dmu_tx_is_syncing(tx)) { 1074 nvlist_t *cnt_track = NULL; 1075 cnt_track = fnvlist_alloc(); 1076 1077 /* Rollup aggregated counts into the cnt_track list */ 1078 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1079 pair != NULL; 1080 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1081 char *pdelim; 1082 uint64_t val; 1083 char nm[MAXPATHLEN]; 1084 1085 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1086 pdelim = strchr(nm, '@'); 1087 if (pdelim == NULL) 1088 continue; 1089 *pdelim = '\0'; 1090 1091 do { 1092 if (nvlist_lookup_uint64(cnt_track, nm, 1093 &val) == 0) { 1094 /* update existing entry */ 1095 fnvlist_add_uint64(cnt_track, nm, 1096 val + 1); 1097 } else { 1098 /* add to list */ 1099 fnvlist_add_uint64(cnt_track, nm, 1); 1100 } 1101 1102 pdelim = strrchr(nm, '/'); 1103 if (pdelim != NULL) 1104 *pdelim = '\0'; 1105 } while (pdelim != NULL); 1106 } 1107 1108 /* Check aggregated counts at each level */ 1109 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1110 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1111 int error = 0; 1112 char *name; 1113 uint64_t cnt = 0; 1114 dsl_dataset_t *ds; 1115 1116 name = nvpair_name(pair); 1117 cnt = fnvpair_value_uint64(pair); 1118 ASSERT(cnt > 0); 1119 1120 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1121 if (error == 0) { 1122 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1123 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1124 ddsa->ddsa_cr); 1125 dsl_dataset_rele(ds, FTAG); 1126 } 1127 1128 if (error != 0) { 1129 if (ddsa->ddsa_errors != NULL) 1130 fnvlist_add_int32(ddsa->ddsa_errors, 1131 name, error); 1132 rv = error; 1133 /* only report one error for this check */ 1134 break; 1135 } 1136 } 1137 nvlist_free(cnt_track); 1138 } 1139 1140 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1141 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1142 int error = 0; 1143 dsl_dataset_t *ds; 1144 char *name, *atp; 1145 char dsname[MAXNAMELEN]; 1146 1147 name = nvpair_name(pair); 1148 if (strlen(name) >= MAXNAMELEN) 1149 error = SET_ERROR(ENAMETOOLONG); 1150 if (error == 0) { 1151 atp = strchr(name, '@'); 1152 if (atp == NULL) 1153 error = SET_ERROR(EINVAL); 1154 if (error == 0) 1155 (void) strlcpy(dsname, name, atp - name + 1); 1156 } 1157 if (error == 0) 1158 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1159 if (error == 0) { 1160 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1161 error = dsl_dataset_snapshot_check_impl(ds, 1162 atp + 1, tx, B_FALSE, 0, NULL); 1163 dsl_dataset_rele(ds, FTAG); 1164 } 1165 1166 if (error != 0) { 1167 if (ddsa->ddsa_errors != NULL) { 1168 fnvlist_add_int32(ddsa->ddsa_errors, 1169 name, error); 1170 } 1171 rv = error; 1172 } 1173 } 1174 1175 return (rv); 1176 } 1177 1178 void 1179 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1180 dmu_tx_t *tx) 1181 { 1182 static zil_header_t zero_zil; 1183 1184 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1185 dmu_buf_t *dbuf; 1186 dsl_dataset_phys_t *dsphys; 1187 uint64_t dsobj, crtxg; 1188 objset_t *mos = dp->dp_meta_objset; 1189 objset_t *os; 1190 1191 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1192 1193 /* 1194 * If we are on an old pool, the zil must not be active, in which 1195 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1196 */ 1197 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1198 dmu_objset_from_ds(ds, &os) != 0 || 1199 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1200 sizeof (zero_zil)) == 0); 1201 1202 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1203 1204 /* 1205 * The origin's ds_creation_txg has to be < TXG_INITIAL 1206 */ 1207 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1208 crtxg = 1; 1209 else 1210 crtxg = tx->tx_txg; 1211 1212 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1213 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1214 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1215 dmu_buf_will_dirty(dbuf, tx); 1216 dsphys = dbuf->db_data; 1217 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1218 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1219 dsphys->ds_fsid_guid = unique_create(); 1220 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1221 sizeof (dsphys->ds_guid)); 1222 dsphys->ds_prev_snap_obj = ds->ds_phys->ds_prev_snap_obj; 1223 dsphys->ds_prev_snap_txg = ds->ds_phys->ds_prev_snap_txg; 1224 dsphys->ds_next_snap_obj = ds->ds_object; 1225 dsphys->ds_num_children = 1; 1226 dsphys->ds_creation_time = gethrestime_sec(); 1227 dsphys->ds_creation_txg = crtxg; 1228 dsphys->ds_deadlist_obj = ds->ds_phys->ds_deadlist_obj; 1229 dsphys->ds_referenced_bytes = ds->ds_phys->ds_referenced_bytes; 1230 dsphys->ds_compressed_bytes = ds->ds_phys->ds_compressed_bytes; 1231 dsphys->ds_uncompressed_bytes = ds->ds_phys->ds_uncompressed_bytes; 1232 dsphys->ds_flags = ds->ds_phys->ds_flags; 1233 dsphys->ds_bp = ds->ds_phys->ds_bp; 1234 dmu_buf_rele(dbuf, FTAG); 1235 1236 if (ds->ds_large_blocks) 1237 dsl_dataset_activate_large_blocks_sync_impl(dsobj, tx); 1238 1239 ASSERT3U(ds->ds_prev != 0, ==, ds->ds_phys->ds_prev_snap_obj != 0); 1240 if (ds->ds_prev) { 1241 uint64_t next_clones_obj = 1242 ds->ds_prev->ds_phys->ds_next_clones_obj; 1243 ASSERT(ds->ds_prev->ds_phys->ds_next_snap_obj == 1244 ds->ds_object || 1245 ds->ds_prev->ds_phys->ds_num_children > 1); 1246 if (ds->ds_prev->ds_phys->ds_next_snap_obj == ds->ds_object) { 1247 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1248 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, ==, 1249 ds->ds_prev->ds_phys->ds_creation_txg); 1250 ds->ds_prev->ds_phys->ds_next_snap_obj = dsobj; 1251 } else if (next_clones_obj != 0) { 1252 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1253 dsphys->ds_next_snap_obj, tx); 1254 VERIFY0(zap_add_int(mos, 1255 next_clones_obj, dsobj, tx)); 1256 } 1257 } 1258 1259 /* 1260 * If we have a reference-reservation on this dataset, we will 1261 * need to increase the amount of refreservation being charged 1262 * since our unique space is going to zero. 1263 */ 1264 if (ds->ds_reserved) { 1265 int64_t delta; 1266 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1267 delta = MIN(ds->ds_phys->ds_unique_bytes, ds->ds_reserved); 1268 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1269 delta, 0, 0, tx); 1270 } 1271 1272 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1273 ds->ds_phys->ds_deadlist_obj = dsl_deadlist_clone(&ds->ds_deadlist, 1274 UINT64_MAX, ds->ds_phys->ds_prev_snap_obj, tx); 1275 dsl_deadlist_close(&ds->ds_deadlist); 1276 dsl_deadlist_open(&ds->ds_deadlist, mos, ds->ds_phys->ds_deadlist_obj); 1277 dsl_deadlist_add_key(&ds->ds_deadlist, 1278 ds->ds_phys->ds_prev_snap_txg, tx); 1279 1280 ASSERT3U(ds->ds_phys->ds_prev_snap_txg, <, tx->tx_txg); 1281 ds->ds_phys->ds_prev_snap_obj = dsobj; 1282 ds->ds_phys->ds_prev_snap_txg = crtxg; 1283 ds->ds_phys->ds_unique_bytes = 0; 1284 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1285 ds->ds_phys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1286 1287 VERIFY0(zap_add(mos, ds->ds_phys->ds_snapnames_zapobj, 1288 snapname, 8, 1, &dsobj, tx)); 1289 1290 if (ds->ds_prev) 1291 dsl_dataset_rele(ds->ds_prev, ds); 1292 VERIFY0(dsl_dataset_hold_obj(dp, 1293 ds->ds_phys->ds_prev_snap_obj, ds, &ds->ds_prev)); 1294 1295 dsl_scan_ds_snapshotted(ds, tx); 1296 1297 dsl_dir_snap_cmtime_update(ds->ds_dir); 1298 1299 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1300 } 1301 1302 static void 1303 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1304 { 1305 dsl_dataset_snapshot_arg_t *ddsa = arg; 1306 dsl_pool_t *dp = dmu_tx_pool(tx); 1307 nvpair_t *pair; 1308 1309 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1310 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1311 dsl_dataset_t *ds; 1312 char *name, *atp; 1313 char dsname[MAXNAMELEN]; 1314 1315 name = nvpair_name(pair); 1316 atp = strchr(name, '@'); 1317 (void) strlcpy(dsname, name, atp - name + 1); 1318 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1319 1320 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1321 if (ddsa->ddsa_props != NULL) { 1322 dsl_props_set_sync_impl(ds->ds_prev, 1323 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1324 } 1325 dsl_dataset_rele(ds, FTAG); 1326 } 1327 } 1328 1329 /* 1330 * The snapshots must all be in the same pool. 1331 * All-or-nothing: if there are any failures, nothing will be modified. 1332 */ 1333 int 1334 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1335 { 1336 dsl_dataset_snapshot_arg_t ddsa; 1337 nvpair_t *pair; 1338 boolean_t needsuspend; 1339 int error; 1340 spa_t *spa; 1341 char *firstname; 1342 nvlist_t *suspended = NULL; 1343 1344 pair = nvlist_next_nvpair(snaps, NULL); 1345 if (pair == NULL) 1346 return (0); 1347 firstname = nvpair_name(pair); 1348 1349 error = spa_open(firstname, &spa, FTAG); 1350 if (error != 0) 1351 return (error); 1352 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1353 spa_close(spa, FTAG); 1354 1355 if (needsuspend) { 1356 suspended = fnvlist_alloc(); 1357 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1358 pair = nvlist_next_nvpair(snaps, pair)) { 1359 char fsname[MAXNAMELEN]; 1360 char *snapname = nvpair_name(pair); 1361 char *atp; 1362 void *cookie; 1363 1364 atp = strchr(snapname, '@'); 1365 if (atp == NULL) { 1366 error = SET_ERROR(EINVAL); 1367 break; 1368 } 1369 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1370 1371 error = zil_suspend(fsname, &cookie); 1372 if (error != 0) 1373 break; 1374 fnvlist_add_uint64(suspended, fsname, 1375 (uintptr_t)cookie); 1376 } 1377 } 1378 1379 ddsa.ddsa_snaps = snaps; 1380 ddsa.ddsa_props = props; 1381 ddsa.ddsa_errors = errors; 1382 ddsa.ddsa_cr = CRED(); 1383 1384 if (error == 0) { 1385 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1386 dsl_dataset_snapshot_sync, &ddsa, 1387 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1388 } 1389 1390 if (suspended != NULL) { 1391 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1392 pair = nvlist_next_nvpair(suspended, pair)) { 1393 zil_resume((void *)(uintptr_t) 1394 fnvpair_value_uint64(pair)); 1395 } 1396 fnvlist_free(suspended); 1397 } 1398 1399 return (error); 1400 } 1401 1402 typedef struct dsl_dataset_snapshot_tmp_arg { 1403 const char *ddsta_fsname; 1404 const char *ddsta_snapname; 1405 minor_t ddsta_cleanup_minor; 1406 const char *ddsta_htag; 1407 } dsl_dataset_snapshot_tmp_arg_t; 1408 1409 static int 1410 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1411 { 1412 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1413 dsl_pool_t *dp = dmu_tx_pool(tx); 1414 dsl_dataset_t *ds; 1415 int error; 1416 1417 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1418 if (error != 0) 1419 return (error); 1420 1421 /* NULL cred means no limit check for tmp snapshot */ 1422 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1423 tx, B_FALSE, 0, NULL); 1424 if (error != 0) { 1425 dsl_dataset_rele(ds, FTAG); 1426 return (error); 1427 } 1428 1429 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1430 dsl_dataset_rele(ds, FTAG); 1431 return (SET_ERROR(ENOTSUP)); 1432 } 1433 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1434 B_TRUE, tx); 1435 if (error != 0) { 1436 dsl_dataset_rele(ds, FTAG); 1437 return (error); 1438 } 1439 1440 dsl_dataset_rele(ds, FTAG); 1441 return (0); 1442 } 1443 1444 static void 1445 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1446 { 1447 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1448 dsl_pool_t *dp = dmu_tx_pool(tx); 1449 dsl_dataset_t *ds; 1450 1451 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1452 1453 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1454 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1455 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1456 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1457 1458 dsl_dataset_rele(ds, FTAG); 1459 } 1460 1461 int 1462 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1463 minor_t cleanup_minor, const char *htag) 1464 { 1465 dsl_dataset_snapshot_tmp_arg_t ddsta; 1466 int error; 1467 spa_t *spa; 1468 boolean_t needsuspend; 1469 void *cookie; 1470 1471 ddsta.ddsta_fsname = fsname; 1472 ddsta.ddsta_snapname = snapname; 1473 ddsta.ddsta_cleanup_minor = cleanup_minor; 1474 ddsta.ddsta_htag = htag; 1475 1476 error = spa_open(fsname, &spa, FTAG); 1477 if (error != 0) 1478 return (error); 1479 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1480 spa_close(spa, FTAG); 1481 1482 if (needsuspend) { 1483 error = zil_suspend(fsname, &cookie); 1484 if (error != 0) 1485 return (error); 1486 } 1487 1488 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1489 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1490 1491 if (needsuspend) 1492 zil_resume(cookie); 1493 return (error); 1494 } 1495 1496 1497 void 1498 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1499 { 1500 ASSERT(dmu_tx_is_syncing(tx)); 1501 ASSERT(ds->ds_objset != NULL); 1502 ASSERT(ds->ds_phys->ds_next_snap_obj == 0); 1503 1504 /* 1505 * in case we had to change ds_fsid_guid when we opened it, 1506 * sync it out now. 1507 */ 1508 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1509 ds->ds_phys->ds_fsid_guid = ds->ds_fsid_guid; 1510 1511 dmu_objset_sync(ds->ds_objset, zio, tx); 1512 1513 if (ds->ds_need_large_blocks && !ds->ds_large_blocks) { 1514 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); 1515 ds->ds_large_blocks = B_TRUE; 1516 } 1517 } 1518 1519 static void 1520 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1521 { 1522 uint64_t count = 0; 1523 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1524 zap_cursor_t zc; 1525 zap_attribute_t za; 1526 nvlist_t *propval = fnvlist_alloc(); 1527 nvlist_t *val = fnvlist_alloc(); 1528 1529 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1530 1531 /* 1532 * There may be missing entries in ds_next_clones_obj 1533 * due to a bug in a previous version of the code. 1534 * Only trust it if it has the right number of entries. 1535 */ 1536 if (ds->ds_phys->ds_next_clones_obj != 0) { 1537 VERIFY0(zap_count(mos, ds->ds_phys->ds_next_clones_obj, 1538 &count)); 1539 } 1540 if (count != ds->ds_phys->ds_num_children - 1) 1541 goto fail; 1542 for (zap_cursor_init(&zc, mos, ds->ds_phys->ds_next_clones_obj); 1543 zap_cursor_retrieve(&zc, &za) == 0; 1544 zap_cursor_advance(&zc)) { 1545 dsl_dataset_t *clone; 1546 char buf[ZFS_MAXNAMELEN]; 1547 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1548 za.za_first_integer, FTAG, &clone)); 1549 dsl_dir_name(clone->ds_dir, buf); 1550 fnvlist_add_boolean(val, buf); 1551 dsl_dataset_rele(clone, FTAG); 1552 } 1553 zap_cursor_fini(&zc); 1554 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1555 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1556 fail: 1557 nvlist_free(val); 1558 nvlist_free(propval); 1559 } 1560 1561 void 1562 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1563 { 1564 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1565 uint64_t refd, avail, uobjs, aobjs, ratio; 1566 1567 ASSERT(dsl_pool_config_held(dp)); 1568 1569 ratio = ds->ds_phys->ds_compressed_bytes == 0 ? 100 : 1570 (ds->ds_phys->ds_uncompressed_bytes * 100 / 1571 ds->ds_phys->ds_compressed_bytes); 1572 1573 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1574 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1575 ds->ds_phys->ds_uncompressed_bytes); 1576 1577 if (dsl_dataset_is_snapshot(ds)) { 1578 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1579 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1580 ds->ds_phys->ds_unique_bytes); 1581 get_clones_stat(ds, nv); 1582 } else { 1583 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1584 char buf[MAXNAMELEN]; 1585 dsl_dataset_name(ds->ds_prev, buf); 1586 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1587 } 1588 1589 dsl_dir_stats(ds->ds_dir, nv); 1590 } 1591 1592 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1593 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1594 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1595 1596 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1597 ds->ds_phys->ds_creation_time); 1598 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1599 ds->ds_phys->ds_creation_txg); 1600 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1601 ds->ds_quota); 1602 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1603 ds->ds_reserved); 1604 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1605 ds->ds_phys->ds_guid); 1606 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1607 ds->ds_phys->ds_unique_bytes); 1608 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1609 ds->ds_object); 1610 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1611 ds->ds_userrefs); 1612 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1613 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1614 1615 if (ds->ds_phys->ds_prev_snap_obj != 0) { 1616 uint64_t written, comp, uncomp; 1617 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1618 dsl_dataset_t *prev; 1619 1620 int err = dsl_dataset_hold_obj(dp, 1621 ds->ds_phys->ds_prev_snap_obj, FTAG, &prev); 1622 if (err == 0) { 1623 err = dsl_dataset_space_written(prev, ds, &written, 1624 &comp, &uncomp); 1625 dsl_dataset_rele(prev, FTAG); 1626 if (err == 0) { 1627 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1628 written); 1629 } 1630 } 1631 } 1632 } 1633 1634 void 1635 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1636 { 1637 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1638 ASSERT(dsl_pool_config_held(dp)); 1639 1640 stat->dds_creation_txg = ds->ds_phys->ds_creation_txg; 1641 stat->dds_inconsistent = ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT; 1642 stat->dds_guid = ds->ds_phys->ds_guid; 1643 stat->dds_origin[0] = '\0'; 1644 if (dsl_dataset_is_snapshot(ds)) { 1645 stat->dds_is_snapshot = B_TRUE; 1646 stat->dds_num_clones = ds->ds_phys->ds_num_children - 1; 1647 } else { 1648 stat->dds_is_snapshot = B_FALSE; 1649 stat->dds_num_clones = 0; 1650 1651 if (dsl_dir_is_clone(ds->ds_dir)) { 1652 dsl_dataset_t *ods; 1653 1654 VERIFY0(dsl_dataset_hold_obj(dp, 1655 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &ods)); 1656 dsl_dataset_name(ods, stat->dds_origin); 1657 dsl_dataset_rele(ods, FTAG); 1658 } 1659 } 1660 } 1661 1662 uint64_t 1663 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1664 { 1665 return (ds->ds_fsid_guid); 1666 } 1667 1668 void 1669 dsl_dataset_space(dsl_dataset_t *ds, 1670 uint64_t *refdbytesp, uint64_t *availbytesp, 1671 uint64_t *usedobjsp, uint64_t *availobjsp) 1672 { 1673 *refdbytesp = ds->ds_phys->ds_referenced_bytes; 1674 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1675 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) 1676 *availbytesp += ds->ds_reserved - ds->ds_phys->ds_unique_bytes; 1677 if (ds->ds_quota != 0) { 1678 /* 1679 * Adjust available bytes according to refquota 1680 */ 1681 if (*refdbytesp < ds->ds_quota) 1682 *availbytesp = MIN(*availbytesp, 1683 ds->ds_quota - *refdbytesp); 1684 else 1685 *availbytesp = 0; 1686 } 1687 *usedobjsp = BP_GET_FILL(&ds->ds_phys->ds_bp); 1688 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1689 } 1690 1691 boolean_t 1692 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1693 { 1694 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1695 1696 ASSERT(dsl_pool_config_held(dp)); 1697 if (snap == NULL) 1698 return (B_FALSE); 1699 if (ds->ds_phys->ds_bp.blk_birth > 1700 snap->ds_phys->ds_creation_txg) { 1701 objset_t *os, *os_snap; 1702 /* 1703 * It may be that only the ZIL differs, because it was 1704 * reset in the head. Don't count that as being 1705 * modified. 1706 */ 1707 if (dmu_objset_from_ds(ds, &os) != 0) 1708 return (B_TRUE); 1709 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1710 return (B_TRUE); 1711 return (bcmp(&os->os_phys->os_meta_dnode, 1712 &os_snap->os_phys->os_meta_dnode, 1713 sizeof (os->os_phys->os_meta_dnode)) != 0); 1714 } 1715 return (B_FALSE); 1716 } 1717 1718 typedef struct dsl_dataset_rename_snapshot_arg { 1719 const char *ddrsa_fsname; 1720 const char *ddrsa_oldsnapname; 1721 const char *ddrsa_newsnapname; 1722 boolean_t ddrsa_recursive; 1723 dmu_tx_t *ddrsa_tx; 1724 } dsl_dataset_rename_snapshot_arg_t; 1725 1726 /* ARGSUSED */ 1727 static int 1728 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1729 dsl_dataset_t *hds, void *arg) 1730 { 1731 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1732 int error; 1733 uint64_t val; 1734 1735 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1736 if (error != 0) { 1737 /* ignore nonexistent snapshots */ 1738 return (error == ENOENT ? 0 : error); 1739 } 1740 1741 /* new name should not exist */ 1742 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1743 if (error == 0) 1744 error = SET_ERROR(EEXIST); 1745 else if (error == ENOENT) 1746 error = 0; 1747 1748 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1749 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1750 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 1751 error = SET_ERROR(ENAMETOOLONG); 1752 1753 return (error); 1754 } 1755 1756 static int 1757 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1758 { 1759 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1760 dsl_pool_t *dp = dmu_tx_pool(tx); 1761 dsl_dataset_t *hds; 1762 int error; 1763 1764 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1765 if (error != 0) 1766 return (error); 1767 1768 if (ddrsa->ddrsa_recursive) { 1769 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1770 dsl_dataset_rename_snapshot_check_impl, ddrsa, 1771 DS_FIND_CHILDREN); 1772 } else { 1773 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 1774 } 1775 dsl_dataset_rele(hds, FTAG); 1776 return (error); 1777 } 1778 1779 static int 1780 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 1781 dsl_dataset_t *hds, void *arg) 1782 { 1783 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1784 dsl_dataset_t *ds; 1785 uint64_t val; 1786 dmu_tx_t *tx = ddrsa->ddrsa_tx; 1787 int error; 1788 1789 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1790 ASSERT(error == 0 || error == ENOENT); 1791 if (error == ENOENT) { 1792 /* ignore nonexistent snapshots */ 1793 return (0); 1794 } 1795 1796 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 1797 1798 /* log before we change the name */ 1799 spa_history_log_internal_ds(ds, "rename", tx, 1800 "-> @%s", ddrsa->ddrsa_newsnapname); 1801 1802 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 1803 B_FALSE)); 1804 mutex_enter(&ds->ds_lock); 1805 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 1806 mutex_exit(&ds->ds_lock); 1807 VERIFY0(zap_add(dp->dp_meta_objset, hds->ds_phys->ds_snapnames_zapobj, 1808 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 1809 1810 dsl_dataset_rele(ds, FTAG); 1811 return (0); 1812 } 1813 1814 static void 1815 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 1816 { 1817 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1818 dsl_pool_t *dp = dmu_tx_pool(tx); 1819 dsl_dataset_t *hds; 1820 1821 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 1822 ddrsa->ddrsa_tx = tx; 1823 if (ddrsa->ddrsa_recursive) { 1824 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1825 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 1826 DS_FIND_CHILDREN)); 1827 } else { 1828 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 1829 } 1830 dsl_dataset_rele(hds, FTAG); 1831 } 1832 1833 int 1834 dsl_dataset_rename_snapshot(const char *fsname, 1835 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 1836 { 1837 dsl_dataset_rename_snapshot_arg_t ddrsa; 1838 1839 ddrsa.ddrsa_fsname = fsname; 1840 ddrsa.ddrsa_oldsnapname = oldsnapname; 1841 ddrsa.ddrsa_newsnapname = newsnapname; 1842 ddrsa.ddrsa_recursive = recursive; 1843 1844 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 1845 dsl_dataset_rename_snapshot_sync, &ddrsa, 1846 1, ZFS_SPACE_CHECK_RESERVED)); 1847 } 1848 1849 /* 1850 * If we're doing an ownership handoff, we need to make sure that there is 1851 * only one long hold on the dataset. We're not allowed to change anything here 1852 * so we don't permanently release the long hold or regular hold here. We want 1853 * to do this only when syncing to avoid the dataset unexpectedly going away 1854 * when we release the long hold. 1855 */ 1856 static int 1857 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 1858 { 1859 boolean_t held; 1860 1861 if (!dmu_tx_is_syncing(tx)) 1862 return (0); 1863 1864 if (owner != NULL) { 1865 VERIFY3P(ds->ds_owner, ==, owner); 1866 dsl_dataset_long_rele(ds, owner); 1867 } 1868 1869 held = dsl_dataset_long_held(ds); 1870 1871 if (owner != NULL) 1872 dsl_dataset_long_hold(ds, owner); 1873 1874 if (held) 1875 return (SET_ERROR(EBUSY)); 1876 1877 return (0); 1878 } 1879 1880 typedef struct dsl_dataset_rollback_arg { 1881 const char *ddra_fsname; 1882 void *ddra_owner; 1883 nvlist_t *ddra_result; 1884 } dsl_dataset_rollback_arg_t; 1885 1886 static int 1887 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 1888 { 1889 dsl_dataset_rollback_arg_t *ddra = arg; 1890 dsl_pool_t *dp = dmu_tx_pool(tx); 1891 dsl_dataset_t *ds; 1892 int64_t unused_refres_delta; 1893 int error; 1894 1895 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 1896 if (error != 0) 1897 return (error); 1898 1899 /* must not be a snapshot */ 1900 if (dsl_dataset_is_snapshot(ds)) { 1901 dsl_dataset_rele(ds, FTAG); 1902 return (SET_ERROR(EINVAL)); 1903 } 1904 1905 /* must have a most recent snapshot */ 1906 if (ds->ds_phys->ds_prev_snap_txg < TXG_INITIAL) { 1907 dsl_dataset_rele(ds, FTAG); 1908 return (SET_ERROR(EINVAL)); 1909 } 1910 1911 /* must not have any bookmarks after the most recent snapshot */ 1912 nvlist_t *proprequest = fnvlist_alloc(); 1913 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 1914 nvlist_t *bookmarks = fnvlist_alloc(); 1915 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 1916 fnvlist_free(proprequest); 1917 if (error != 0) 1918 return (error); 1919 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 1920 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 1921 nvlist_t *valuenv = 1922 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 1923 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 1924 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 1925 if (createtxg > ds->ds_phys->ds_prev_snap_txg) { 1926 fnvlist_free(bookmarks); 1927 dsl_dataset_rele(ds, FTAG); 1928 return (SET_ERROR(EEXIST)); 1929 } 1930 } 1931 fnvlist_free(bookmarks); 1932 1933 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 1934 if (error != 0) { 1935 dsl_dataset_rele(ds, FTAG); 1936 return (error); 1937 } 1938 1939 /* 1940 * Check if the snap we are rolling back to uses more than 1941 * the refquota. 1942 */ 1943 if (ds->ds_quota != 0 && 1944 ds->ds_prev->ds_phys->ds_referenced_bytes > ds->ds_quota) { 1945 dsl_dataset_rele(ds, FTAG); 1946 return (SET_ERROR(EDQUOT)); 1947 } 1948 1949 /* 1950 * When we do the clone swap, we will temporarily use more space 1951 * due to the refreservation (the head will no longer have any 1952 * unique space, so the entire amount of the refreservation will need 1953 * to be free). We will immediately destroy the clone, freeing 1954 * this space, but the freeing happens over many txg's. 1955 */ 1956 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 1957 ds->ds_phys->ds_unique_bytes); 1958 1959 if (unused_refres_delta > 0 && 1960 unused_refres_delta > 1961 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 1962 dsl_dataset_rele(ds, FTAG); 1963 return (SET_ERROR(ENOSPC)); 1964 } 1965 1966 dsl_dataset_rele(ds, FTAG); 1967 return (0); 1968 } 1969 1970 static void 1971 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 1972 { 1973 dsl_dataset_rollback_arg_t *ddra = arg; 1974 dsl_pool_t *dp = dmu_tx_pool(tx); 1975 dsl_dataset_t *ds, *clone; 1976 uint64_t cloneobj; 1977 char namebuf[ZFS_MAXNAMELEN]; 1978 1979 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 1980 1981 dsl_dataset_name(ds->ds_prev, namebuf); 1982 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 1983 1984 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 1985 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 1986 1987 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 1988 1989 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 1990 dsl_dataset_zero_zil(ds, tx); 1991 1992 dsl_destroy_head_sync_impl(clone, tx); 1993 1994 dsl_dataset_rele(clone, FTAG); 1995 dsl_dataset_rele(ds, FTAG); 1996 } 1997 1998 /* 1999 * Rolls back the given filesystem or volume to the most recent snapshot. 2000 * The name of the most recent snapshot will be returned under key "target" 2001 * in the result nvlist. 2002 * 2003 * If owner != NULL: 2004 * - The existing dataset MUST be owned by the specified owner at entry 2005 * - Upon return, dataset will still be held by the same owner, whether we 2006 * succeed or not. 2007 * 2008 * This mode is required any time the existing filesystem is mounted. See 2009 * notes above zfs_suspend_fs() for further details. 2010 */ 2011 int 2012 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2013 { 2014 dsl_dataset_rollback_arg_t ddra; 2015 2016 ddra.ddra_fsname = fsname; 2017 ddra.ddra_owner = owner; 2018 ddra.ddra_result = result; 2019 2020 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2021 dsl_dataset_rollback_sync, &ddra, 2022 1, ZFS_SPACE_CHECK_RESERVED)); 2023 } 2024 2025 struct promotenode { 2026 list_node_t link; 2027 dsl_dataset_t *ds; 2028 }; 2029 2030 typedef struct dsl_dataset_promote_arg { 2031 const char *ddpa_clonename; 2032 dsl_dataset_t *ddpa_clone; 2033 list_t shared_snaps, origin_snaps, clone_snaps; 2034 dsl_dataset_t *origin_origin; /* origin of the origin */ 2035 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2036 char *err_ds; 2037 cred_t *cr; 2038 } dsl_dataset_promote_arg_t; 2039 2040 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2041 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2042 void *tag); 2043 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2044 2045 static int 2046 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2047 { 2048 dsl_dataset_promote_arg_t *ddpa = arg; 2049 dsl_pool_t *dp = dmu_tx_pool(tx); 2050 dsl_dataset_t *hds; 2051 struct promotenode *snap; 2052 dsl_dataset_t *origin_ds; 2053 int err; 2054 uint64_t unused; 2055 uint64_t ss_mv_cnt; 2056 2057 err = promote_hold(ddpa, dp, FTAG); 2058 if (err != 0) 2059 return (err); 2060 2061 hds = ddpa->ddpa_clone; 2062 2063 if (hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE) { 2064 promote_rele(ddpa, FTAG); 2065 return (SET_ERROR(EXDEV)); 2066 } 2067 2068 /* 2069 * Compute and check the amount of space to transfer. Since this is 2070 * so expensive, don't do the preliminary check. 2071 */ 2072 if (!dmu_tx_is_syncing(tx)) { 2073 promote_rele(ddpa, FTAG); 2074 return (0); 2075 } 2076 2077 snap = list_head(&ddpa->shared_snaps); 2078 origin_ds = snap->ds; 2079 2080 /* compute origin's new unique space */ 2081 snap = list_tail(&ddpa->clone_snaps); 2082 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2083 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2084 origin_ds->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2085 &ddpa->unique, &unused, &unused); 2086 2087 /* 2088 * Walk the snapshots that we are moving 2089 * 2090 * Compute space to transfer. Consider the incremental changes 2091 * to used by each snapshot: 2092 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2093 * So each snapshot gave birth to: 2094 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2095 * So a sequence would look like: 2096 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2097 * Which simplifies to: 2098 * uN + kN + kN-1 + ... + k1 + k0 2099 * Note however, if we stop before we reach the ORIGIN we get: 2100 * uN + kN + kN-1 + ... + kM - uM-1 2101 */ 2102 ss_mv_cnt = 0; 2103 ddpa->used = origin_ds->ds_phys->ds_referenced_bytes; 2104 ddpa->comp = origin_ds->ds_phys->ds_compressed_bytes; 2105 ddpa->uncomp = origin_ds->ds_phys->ds_uncompressed_bytes; 2106 for (snap = list_head(&ddpa->shared_snaps); snap; 2107 snap = list_next(&ddpa->shared_snaps, snap)) { 2108 uint64_t val, dlused, dlcomp, dluncomp; 2109 dsl_dataset_t *ds = snap->ds; 2110 2111 ss_mv_cnt++; 2112 2113 /* 2114 * If there are long holds, we won't be able to evict 2115 * the objset. 2116 */ 2117 if (dsl_dataset_long_held(ds)) { 2118 err = SET_ERROR(EBUSY); 2119 goto out; 2120 } 2121 2122 /* Check that the snapshot name does not conflict */ 2123 VERIFY0(dsl_dataset_get_snapname(ds)); 2124 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2125 if (err == 0) { 2126 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2127 err = SET_ERROR(EEXIST); 2128 goto out; 2129 } 2130 if (err != ENOENT) 2131 goto out; 2132 2133 /* The very first snapshot does not have a deadlist */ 2134 if (ds->ds_phys->ds_prev_snap_obj == 0) 2135 continue; 2136 2137 dsl_deadlist_space(&ds->ds_deadlist, 2138 &dlused, &dlcomp, &dluncomp); 2139 ddpa->used += dlused; 2140 ddpa->comp += dlcomp; 2141 ddpa->uncomp += dluncomp; 2142 } 2143 2144 /* 2145 * If we are a clone of a clone then we never reached ORIGIN, 2146 * so we need to subtract out the clone origin's used space. 2147 */ 2148 if (ddpa->origin_origin) { 2149 ddpa->used -= ddpa->origin_origin->ds_phys->ds_referenced_bytes; 2150 ddpa->comp -= ddpa->origin_origin->ds_phys->ds_compressed_bytes; 2151 ddpa->uncomp -= 2152 ddpa->origin_origin->ds_phys->ds_uncompressed_bytes; 2153 } 2154 2155 /* Check that there is enough space and limit headroom here */ 2156 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2157 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2158 if (err != 0) 2159 goto out; 2160 2161 /* 2162 * Compute the amounts of space that will be used by snapshots 2163 * after the promotion (for both origin and clone). For each, 2164 * it is the amount of space that will be on all of their 2165 * deadlists (that was not born before their new origin). 2166 */ 2167 if (hds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2168 uint64_t space; 2169 2170 /* 2171 * Note, typically this will not be a clone of a clone, 2172 * so dd_origin_txg will be < TXG_INITIAL, so 2173 * these snaplist_space() -> dsl_deadlist_space_range() 2174 * calls will be fast because they do not have to 2175 * iterate over all bps. 2176 */ 2177 snap = list_head(&ddpa->origin_snaps); 2178 err = snaplist_space(&ddpa->shared_snaps, 2179 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2180 if (err != 0) 2181 goto out; 2182 2183 err = snaplist_space(&ddpa->clone_snaps, 2184 snap->ds->ds_dir->dd_origin_txg, &space); 2185 if (err != 0) 2186 goto out; 2187 ddpa->cloneusedsnap += space; 2188 } 2189 if (origin_ds->ds_dir->dd_phys->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2190 err = snaplist_space(&ddpa->origin_snaps, 2191 origin_ds->ds_phys->ds_creation_txg, &ddpa->originusedsnap); 2192 if (err != 0) 2193 goto out; 2194 } 2195 2196 out: 2197 promote_rele(ddpa, FTAG); 2198 return (err); 2199 } 2200 2201 static void 2202 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2203 { 2204 dsl_dataset_promote_arg_t *ddpa = arg; 2205 dsl_pool_t *dp = dmu_tx_pool(tx); 2206 dsl_dataset_t *hds; 2207 struct promotenode *snap; 2208 dsl_dataset_t *origin_ds; 2209 dsl_dataset_t *origin_head; 2210 dsl_dir_t *dd; 2211 dsl_dir_t *odd = NULL; 2212 uint64_t oldnext_obj; 2213 int64_t delta; 2214 2215 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2216 hds = ddpa->ddpa_clone; 2217 2218 ASSERT0(hds->ds_phys->ds_flags & DS_FLAG_NOPROMOTE); 2219 2220 snap = list_head(&ddpa->shared_snaps); 2221 origin_ds = snap->ds; 2222 dd = hds->ds_dir; 2223 2224 snap = list_head(&ddpa->origin_snaps); 2225 origin_head = snap->ds; 2226 2227 /* 2228 * We need to explicitly open odd, since origin_ds's dd will be 2229 * changing. 2230 */ 2231 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2232 NULL, FTAG, &odd)); 2233 2234 /* change origin's next snap */ 2235 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2236 oldnext_obj = origin_ds->ds_phys->ds_next_snap_obj; 2237 snap = list_tail(&ddpa->clone_snaps); 2238 ASSERT3U(snap->ds->ds_phys->ds_prev_snap_obj, ==, origin_ds->ds_object); 2239 origin_ds->ds_phys->ds_next_snap_obj = snap->ds->ds_object; 2240 2241 /* change the origin's next clone */ 2242 if (origin_ds->ds_phys->ds_next_clones_obj) { 2243 dsl_dataset_remove_from_next_clones(origin_ds, 2244 snap->ds->ds_object, tx); 2245 VERIFY0(zap_add_int(dp->dp_meta_objset, 2246 origin_ds->ds_phys->ds_next_clones_obj, 2247 oldnext_obj, tx)); 2248 } 2249 2250 /* change origin */ 2251 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2252 ASSERT3U(dd->dd_phys->dd_origin_obj, ==, origin_ds->ds_object); 2253 dd->dd_phys->dd_origin_obj = odd->dd_phys->dd_origin_obj; 2254 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2255 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2256 odd->dd_phys->dd_origin_obj = origin_ds->ds_object; 2257 origin_head->ds_dir->dd_origin_txg = 2258 origin_ds->ds_phys->ds_creation_txg; 2259 2260 /* change dd_clone entries */ 2261 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2262 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2263 odd->dd_phys->dd_clones, hds->ds_object, tx)); 2264 VERIFY0(zap_add_int(dp->dp_meta_objset, 2265 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2266 hds->ds_object, tx)); 2267 2268 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2269 ddpa->origin_origin->ds_dir->dd_phys->dd_clones, 2270 origin_head->ds_object, tx)); 2271 if (dd->dd_phys->dd_clones == 0) { 2272 dd->dd_phys->dd_clones = zap_create(dp->dp_meta_objset, 2273 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 2274 } 2275 VERIFY0(zap_add_int(dp->dp_meta_objset, 2276 dd->dd_phys->dd_clones, origin_head->ds_object, tx)); 2277 } 2278 2279 /* move snapshots to this dir */ 2280 for (snap = list_head(&ddpa->shared_snaps); snap; 2281 snap = list_next(&ddpa->shared_snaps, snap)) { 2282 dsl_dataset_t *ds = snap->ds; 2283 2284 /* 2285 * Property callbacks are registered to a particular 2286 * dsl_dir. Since ours is changing, evict the objset 2287 * so that they will be unregistered from the old dsl_dir. 2288 */ 2289 if (ds->ds_objset) { 2290 dmu_objset_evict(ds->ds_objset); 2291 ds->ds_objset = NULL; 2292 } 2293 2294 /* move snap name entry */ 2295 VERIFY0(dsl_dataset_get_snapname(ds)); 2296 VERIFY0(dsl_dataset_snap_remove(origin_head, 2297 ds->ds_snapname, tx, B_TRUE)); 2298 VERIFY0(zap_add(dp->dp_meta_objset, 2299 hds->ds_phys->ds_snapnames_zapobj, ds->ds_snapname, 2300 8, 1, &ds->ds_object, tx)); 2301 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2302 DD_FIELD_SNAPSHOT_COUNT, tx); 2303 2304 /* change containing dsl_dir */ 2305 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2306 ASSERT3U(ds->ds_phys->ds_dir_obj, ==, odd->dd_object); 2307 ds->ds_phys->ds_dir_obj = dd->dd_object; 2308 ASSERT3P(ds->ds_dir, ==, odd); 2309 dsl_dir_rele(ds->ds_dir, ds); 2310 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2311 NULL, ds, &ds->ds_dir)); 2312 2313 /* move any clone references */ 2314 if (ds->ds_phys->ds_next_clones_obj && 2315 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2316 zap_cursor_t zc; 2317 zap_attribute_t za; 2318 2319 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2320 ds->ds_phys->ds_next_clones_obj); 2321 zap_cursor_retrieve(&zc, &za) == 0; 2322 zap_cursor_advance(&zc)) { 2323 dsl_dataset_t *cnds; 2324 uint64_t o; 2325 2326 if (za.za_first_integer == oldnext_obj) { 2327 /* 2328 * We've already moved the 2329 * origin's reference. 2330 */ 2331 continue; 2332 } 2333 2334 VERIFY0(dsl_dataset_hold_obj(dp, 2335 za.za_first_integer, FTAG, &cnds)); 2336 o = cnds->ds_dir->dd_phys->dd_head_dataset_obj; 2337 2338 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2339 odd->dd_phys->dd_clones, o, tx)); 2340 VERIFY0(zap_add_int(dp->dp_meta_objset, 2341 dd->dd_phys->dd_clones, o, tx)); 2342 dsl_dataset_rele(cnds, FTAG); 2343 } 2344 zap_cursor_fini(&zc); 2345 } 2346 2347 ASSERT(!dsl_prop_hascb(ds)); 2348 } 2349 2350 /* 2351 * Change space accounting. 2352 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2353 * both be valid, or both be 0 (resulting in delta == 0). This 2354 * is true for each of {clone,origin} independently. 2355 */ 2356 2357 delta = ddpa->cloneusedsnap - 2358 dd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2359 ASSERT3S(delta, >=, 0); 2360 ASSERT3U(ddpa->used, >=, delta); 2361 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2362 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2363 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2364 2365 delta = ddpa->originusedsnap - 2366 odd->dd_phys->dd_used_breakdown[DD_USED_SNAP]; 2367 ASSERT3S(delta, <=, 0); 2368 ASSERT3U(ddpa->used, >=, -delta); 2369 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2370 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2371 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2372 2373 origin_ds->ds_phys->ds_unique_bytes = ddpa->unique; 2374 2375 /* log history record */ 2376 spa_history_log_internal_ds(hds, "promote", tx, ""); 2377 2378 dsl_dir_rele(odd, FTAG); 2379 promote_rele(ddpa, FTAG); 2380 } 2381 2382 /* 2383 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2384 * (exclusive) and last_obj (inclusive). The list will be in reverse 2385 * order (last_obj will be the list_head()). If first_obj == 0, do all 2386 * snapshots back to this dataset's origin. 2387 */ 2388 static int 2389 snaplist_make(dsl_pool_t *dp, 2390 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2391 { 2392 uint64_t obj = last_obj; 2393 2394 list_create(l, sizeof (struct promotenode), 2395 offsetof(struct promotenode, link)); 2396 2397 while (obj != first_obj) { 2398 dsl_dataset_t *ds; 2399 struct promotenode *snap; 2400 int err; 2401 2402 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2403 ASSERT(err != ENOENT); 2404 if (err != 0) 2405 return (err); 2406 2407 if (first_obj == 0) 2408 first_obj = ds->ds_dir->dd_phys->dd_origin_obj; 2409 2410 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2411 snap->ds = ds; 2412 list_insert_tail(l, snap); 2413 obj = ds->ds_phys->ds_prev_snap_obj; 2414 } 2415 2416 return (0); 2417 } 2418 2419 static int 2420 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2421 { 2422 struct promotenode *snap; 2423 2424 *spacep = 0; 2425 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2426 uint64_t used, comp, uncomp; 2427 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2428 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2429 *spacep += used; 2430 } 2431 return (0); 2432 } 2433 2434 static void 2435 snaplist_destroy(list_t *l, void *tag) 2436 { 2437 struct promotenode *snap; 2438 2439 if (l == NULL || !list_link_active(&l->list_head)) 2440 return; 2441 2442 while ((snap = list_tail(l)) != NULL) { 2443 list_remove(l, snap); 2444 dsl_dataset_rele(snap->ds, tag); 2445 kmem_free(snap, sizeof (*snap)); 2446 } 2447 list_destroy(l); 2448 } 2449 2450 static int 2451 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2452 { 2453 int error; 2454 dsl_dir_t *dd; 2455 struct promotenode *snap; 2456 2457 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2458 &ddpa->ddpa_clone); 2459 if (error != 0) 2460 return (error); 2461 dd = ddpa->ddpa_clone->ds_dir; 2462 2463 if (dsl_dataset_is_snapshot(ddpa->ddpa_clone) || 2464 !dsl_dir_is_clone(dd)) { 2465 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2466 return (SET_ERROR(EINVAL)); 2467 } 2468 2469 error = snaplist_make(dp, 0, dd->dd_phys->dd_origin_obj, 2470 &ddpa->shared_snaps, tag); 2471 if (error != 0) 2472 goto out; 2473 2474 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2475 &ddpa->clone_snaps, tag); 2476 if (error != 0) 2477 goto out; 2478 2479 snap = list_head(&ddpa->shared_snaps); 2480 ASSERT3U(snap->ds->ds_object, ==, dd->dd_phys->dd_origin_obj); 2481 error = snaplist_make(dp, dd->dd_phys->dd_origin_obj, 2482 snap->ds->ds_dir->dd_phys->dd_head_dataset_obj, 2483 &ddpa->origin_snaps, tag); 2484 if (error != 0) 2485 goto out; 2486 2487 if (snap->ds->ds_dir->dd_phys->dd_origin_obj != 0) { 2488 error = dsl_dataset_hold_obj(dp, 2489 snap->ds->ds_dir->dd_phys->dd_origin_obj, 2490 tag, &ddpa->origin_origin); 2491 if (error != 0) 2492 goto out; 2493 } 2494 out: 2495 if (error != 0) 2496 promote_rele(ddpa, tag); 2497 return (error); 2498 } 2499 2500 static void 2501 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2502 { 2503 snaplist_destroy(&ddpa->shared_snaps, tag); 2504 snaplist_destroy(&ddpa->clone_snaps, tag); 2505 snaplist_destroy(&ddpa->origin_snaps, tag); 2506 if (ddpa->origin_origin != NULL) 2507 dsl_dataset_rele(ddpa->origin_origin, tag); 2508 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2509 } 2510 2511 /* 2512 * Promote a clone. 2513 * 2514 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2515 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2516 */ 2517 int 2518 dsl_dataset_promote(const char *name, char *conflsnap) 2519 { 2520 dsl_dataset_promote_arg_t ddpa = { 0 }; 2521 uint64_t numsnaps; 2522 int error; 2523 objset_t *os; 2524 2525 /* 2526 * We will modify space proportional to the number of 2527 * snapshots. Compute numsnaps. 2528 */ 2529 error = dmu_objset_hold(name, FTAG, &os); 2530 if (error != 0) 2531 return (error); 2532 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2533 dmu_objset_ds(os)->ds_phys->ds_snapnames_zapobj, &numsnaps); 2534 dmu_objset_rele(os, FTAG); 2535 if (error != 0) 2536 return (error); 2537 2538 ddpa.ddpa_clonename = name; 2539 ddpa.err_ds = conflsnap; 2540 ddpa.cr = CRED(); 2541 2542 return (dsl_sync_task(name, dsl_dataset_promote_check, 2543 dsl_dataset_promote_sync, &ddpa, 2544 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2545 } 2546 2547 int 2548 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2549 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2550 { 2551 int64_t unused_refres_delta; 2552 2553 /* they should both be heads */ 2554 if (dsl_dataset_is_snapshot(clone) || 2555 dsl_dataset_is_snapshot(origin_head)) 2556 return (SET_ERROR(EINVAL)); 2557 2558 /* if we are not forcing, the branch point should be just before them */ 2559 if (!force && clone->ds_prev != origin_head->ds_prev) 2560 return (SET_ERROR(EINVAL)); 2561 2562 /* clone should be the clone (unless they are unrelated) */ 2563 if (clone->ds_prev != NULL && 2564 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2565 origin_head->ds_dir != clone->ds_prev->ds_dir) 2566 return (SET_ERROR(EINVAL)); 2567 2568 /* the clone should be a child of the origin */ 2569 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2570 return (SET_ERROR(EINVAL)); 2571 2572 /* origin_head shouldn't be modified unless 'force' */ 2573 if (!force && 2574 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2575 return (SET_ERROR(ETXTBSY)); 2576 2577 /* origin_head should have no long holds (e.g. is not mounted) */ 2578 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2579 return (SET_ERROR(EBUSY)); 2580 2581 /* check amount of any unconsumed refreservation */ 2582 unused_refres_delta = 2583 (int64_t)MIN(origin_head->ds_reserved, 2584 origin_head->ds_phys->ds_unique_bytes) - 2585 (int64_t)MIN(origin_head->ds_reserved, 2586 clone->ds_phys->ds_unique_bytes); 2587 2588 if (unused_refres_delta > 0 && 2589 unused_refres_delta > 2590 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2591 return (SET_ERROR(ENOSPC)); 2592 2593 /* clone can't be over the head's refquota */ 2594 if (origin_head->ds_quota != 0 && 2595 clone->ds_phys->ds_referenced_bytes > origin_head->ds_quota) 2596 return (SET_ERROR(EDQUOT)); 2597 2598 return (0); 2599 } 2600 2601 void 2602 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2603 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2604 { 2605 dsl_pool_t *dp = dmu_tx_pool(tx); 2606 int64_t unused_refres_delta; 2607 2608 ASSERT(clone->ds_reserved == 0); 2609 ASSERT(origin_head->ds_quota == 0 || 2610 clone->ds_phys->ds_unique_bytes <= origin_head->ds_quota); 2611 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2612 2613 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2614 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2615 2616 if (clone->ds_objset != NULL) { 2617 dmu_objset_evict(clone->ds_objset); 2618 clone->ds_objset = NULL; 2619 } 2620 2621 if (origin_head->ds_objset != NULL) { 2622 dmu_objset_evict(origin_head->ds_objset); 2623 origin_head->ds_objset = NULL; 2624 } 2625 2626 unused_refres_delta = 2627 (int64_t)MIN(origin_head->ds_reserved, 2628 origin_head->ds_phys->ds_unique_bytes) - 2629 (int64_t)MIN(origin_head->ds_reserved, 2630 clone->ds_phys->ds_unique_bytes); 2631 2632 /* 2633 * Reset origin's unique bytes, if it exists. 2634 */ 2635 if (clone->ds_prev) { 2636 dsl_dataset_t *origin = clone->ds_prev; 2637 uint64_t comp, uncomp; 2638 2639 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2640 dsl_deadlist_space_range(&clone->ds_deadlist, 2641 origin->ds_phys->ds_prev_snap_txg, UINT64_MAX, 2642 &origin->ds_phys->ds_unique_bytes, &comp, &uncomp); 2643 } 2644 2645 /* swap blkptrs */ 2646 { 2647 blkptr_t tmp; 2648 tmp = origin_head->ds_phys->ds_bp; 2649 origin_head->ds_phys->ds_bp = clone->ds_phys->ds_bp; 2650 clone->ds_phys->ds_bp = tmp; 2651 } 2652 2653 /* set dd_*_bytes */ 2654 { 2655 int64_t dused, dcomp, duncomp; 2656 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2657 uint64_t odl_used, odl_comp, odl_uncomp; 2658 2659 ASSERT3U(clone->ds_dir->dd_phys-> 2660 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2661 2662 dsl_deadlist_space(&clone->ds_deadlist, 2663 &cdl_used, &cdl_comp, &cdl_uncomp); 2664 dsl_deadlist_space(&origin_head->ds_deadlist, 2665 &odl_used, &odl_comp, &odl_uncomp); 2666 2667 dused = clone->ds_phys->ds_referenced_bytes + cdl_used - 2668 (origin_head->ds_phys->ds_referenced_bytes + odl_used); 2669 dcomp = clone->ds_phys->ds_compressed_bytes + cdl_comp - 2670 (origin_head->ds_phys->ds_compressed_bytes + odl_comp); 2671 duncomp = clone->ds_phys->ds_uncompressed_bytes + 2672 cdl_uncomp - 2673 (origin_head->ds_phys->ds_uncompressed_bytes + odl_uncomp); 2674 2675 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2676 dused, dcomp, duncomp, tx); 2677 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2678 -dused, -dcomp, -duncomp, tx); 2679 2680 /* 2681 * The difference in the space used by snapshots is the 2682 * difference in snapshot space due to the head's 2683 * deadlist (since that's the only thing that's 2684 * changing that affects the snapused). 2685 */ 2686 dsl_deadlist_space_range(&clone->ds_deadlist, 2687 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2688 &cdl_used, &cdl_comp, &cdl_uncomp); 2689 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2690 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2691 &odl_used, &odl_comp, &odl_uncomp); 2692 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2693 DD_USED_HEAD, DD_USED_SNAP, tx); 2694 } 2695 2696 /* swap ds_*_bytes */ 2697 SWITCH64(origin_head->ds_phys->ds_referenced_bytes, 2698 clone->ds_phys->ds_referenced_bytes); 2699 SWITCH64(origin_head->ds_phys->ds_compressed_bytes, 2700 clone->ds_phys->ds_compressed_bytes); 2701 SWITCH64(origin_head->ds_phys->ds_uncompressed_bytes, 2702 clone->ds_phys->ds_uncompressed_bytes); 2703 SWITCH64(origin_head->ds_phys->ds_unique_bytes, 2704 clone->ds_phys->ds_unique_bytes); 2705 2706 /* apply any parent delta for change in unconsumed refreservation */ 2707 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 2708 unused_refres_delta, 0, 0, tx); 2709 2710 /* 2711 * Swap deadlists. 2712 */ 2713 dsl_deadlist_close(&clone->ds_deadlist); 2714 dsl_deadlist_close(&origin_head->ds_deadlist); 2715 SWITCH64(origin_head->ds_phys->ds_deadlist_obj, 2716 clone->ds_phys->ds_deadlist_obj); 2717 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 2718 clone->ds_phys->ds_deadlist_obj); 2719 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 2720 origin_head->ds_phys->ds_deadlist_obj); 2721 2722 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 2723 2724 spa_history_log_internal_ds(clone, "clone swap", tx, 2725 "parent=%s", origin_head->ds_dir->dd_myname); 2726 } 2727 2728 /* 2729 * Given a pool name and a dataset object number in that pool, 2730 * return the name of that dataset. 2731 */ 2732 int 2733 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 2734 { 2735 dsl_pool_t *dp; 2736 dsl_dataset_t *ds; 2737 int error; 2738 2739 error = dsl_pool_hold(pname, FTAG, &dp); 2740 if (error != 0) 2741 return (error); 2742 2743 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 2744 if (error == 0) { 2745 dsl_dataset_name(ds, buf); 2746 dsl_dataset_rele(ds, FTAG); 2747 } 2748 dsl_pool_rele(dp, FTAG); 2749 2750 return (error); 2751 } 2752 2753 int 2754 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 2755 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 2756 { 2757 int error = 0; 2758 2759 ASSERT3S(asize, >, 0); 2760 2761 /* 2762 * *ref_rsrv is the portion of asize that will come from any 2763 * unconsumed refreservation space. 2764 */ 2765 *ref_rsrv = 0; 2766 2767 mutex_enter(&ds->ds_lock); 2768 /* 2769 * Make a space adjustment for reserved bytes. 2770 */ 2771 if (ds->ds_reserved > ds->ds_phys->ds_unique_bytes) { 2772 ASSERT3U(*used, >=, 2773 ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2774 *used -= (ds->ds_reserved - ds->ds_phys->ds_unique_bytes); 2775 *ref_rsrv = 2776 asize - MIN(asize, parent_delta(ds, asize + inflight)); 2777 } 2778 2779 if (!check_quota || ds->ds_quota == 0) { 2780 mutex_exit(&ds->ds_lock); 2781 return (0); 2782 } 2783 /* 2784 * If they are requesting more space, and our current estimate 2785 * is over quota, they get to try again unless the actual 2786 * on-disk is over quota and there are no pending changes (which 2787 * may free up space for us). 2788 */ 2789 if (ds->ds_phys->ds_referenced_bytes + inflight >= ds->ds_quota) { 2790 if (inflight > 0 || 2791 ds->ds_phys->ds_referenced_bytes < ds->ds_quota) 2792 error = SET_ERROR(ERESTART); 2793 else 2794 error = SET_ERROR(EDQUOT); 2795 } 2796 mutex_exit(&ds->ds_lock); 2797 2798 return (error); 2799 } 2800 2801 typedef struct dsl_dataset_set_qr_arg { 2802 const char *ddsqra_name; 2803 zprop_source_t ddsqra_source; 2804 uint64_t ddsqra_value; 2805 } dsl_dataset_set_qr_arg_t; 2806 2807 2808 /* ARGSUSED */ 2809 static int 2810 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 2811 { 2812 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2813 dsl_pool_t *dp = dmu_tx_pool(tx); 2814 dsl_dataset_t *ds; 2815 int error; 2816 uint64_t newval; 2817 2818 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 2819 return (SET_ERROR(ENOTSUP)); 2820 2821 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2822 if (error != 0) 2823 return (error); 2824 2825 if (dsl_dataset_is_snapshot(ds)) { 2826 dsl_dataset_rele(ds, FTAG); 2827 return (SET_ERROR(EINVAL)); 2828 } 2829 2830 error = dsl_prop_predict(ds->ds_dir, 2831 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2832 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2833 if (error != 0) { 2834 dsl_dataset_rele(ds, FTAG); 2835 return (error); 2836 } 2837 2838 if (newval == 0) { 2839 dsl_dataset_rele(ds, FTAG); 2840 return (0); 2841 } 2842 2843 if (newval < ds->ds_phys->ds_referenced_bytes || 2844 newval < ds->ds_reserved) { 2845 dsl_dataset_rele(ds, FTAG); 2846 return (SET_ERROR(ENOSPC)); 2847 } 2848 2849 dsl_dataset_rele(ds, FTAG); 2850 return (0); 2851 } 2852 2853 static void 2854 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 2855 { 2856 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2857 dsl_pool_t *dp = dmu_tx_pool(tx); 2858 dsl_dataset_t *ds; 2859 uint64_t newval; 2860 2861 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2862 2863 dsl_prop_set_sync_impl(ds, 2864 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 2865 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 2866 &ddsqra->ddsqra_value, tx); 2867 2868 VERIFY0(dsl_prop_get_int_ds(ds, 2869 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 2870 2871 if (ds->ds_quota != newval) { 2872 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2873 ds->ds_quota = newval; 2874 } 2875 dsl_dataset_rele(ds, FTAG); 2876 } 2877 2878 int 2879 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 2880 uint64_t refquota) 2881 { 2882 dsl_dataset_set_qr_arg_t ddsqra; 2883 2884 ddsqra.ddsqra_name = dsname; 2885 ddsqra.ddsqra_source = source; 2886 ddsqra.ddsqra_value = refquota; 2887 2888 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 2889 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 2890 } 2891 2892 static int 2893 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 2894 { 2895 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2896 dsl_pool_t *dp = dmu_tx_pool(tx); 2897 dsl_dataset_t *ds; 2898 int error; 2899 uint64_t newval, unique; 2900 2901 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 2902 return (SET_ERROR(ENOTSUP)); 2903 2904 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 2905 if (error != 0) 2906 return (error); 2907 2908 if (dsl_dataset_is_snapshot(ds)) { 2909 dsl_dataset_rele(ds, FTAG); 2910 return (SET_ERROR(EINVAL)); 2911 } 2912 2913 error = dsl_prop_predict(ds->ds_dir, 2914 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2915 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 2916 if (error != 0) { 2917 dsl_dataset_rele(ds, FTAG); 2918 return (error); 2919 } 2920 2921 /* 2922 * If we are doing the preliminary check in open context, the 2923 * space estimates may be inaccurate. 2924 */ 2925 if (!dmu_tx_is_syncing(tx)) { 2926 dsl_dataset_rele(ds, FTAG); 2927 return (0); 2928 } 2929 2930 mutex_enter(&ds->ds_lock); 2931 if (!DS_UNIQUE_IS_ACCURATE(ds)) 2932 dsl_dataset_recalc_head_uniq(ds); 2933 unique = ds->ds_phys->ds_unique_bytes; 2934 mutex_exit(&ds->ds_lock); 2935 2936 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 2937 uint64_t delta = MAX(unique, newval) - 2938 MAX(unique, ds->ds_reserved); 2939 2940 if (delta > 2941 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 2942 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 2943 dsl_dataset_rele(ds, FTAG); 2944 return (SET_ERROR(ENOSPC)); 2945 } 2946 } 2947 2948 dsl_dataset_rele(ds, FTAG); 2949 return (0); 2950 } 2951 2952 void 2953 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 2954 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 2955 { 2956 uint64_t newval; 2957 uint64_t unique; 2958 int64_t delta; 2959 2960 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2961 source, sizeof (value), 1, &value, tx); 2962 2963 VERIFY0(dsl_prop_get_int_ds(ds, 2964 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 2965 2966 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2967 mutex_enter(&ds->ds_dir->dd_lock); 2968 mutex_enter(&ds->ds_lock); 2969 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 2970 unique = ds->ds_phys->ds_unique_bytes; 2971 delta = MAX(0, (int64_t)(newval - unique)) - 2972 MAX(0, (int64_t)(ds->ds_reserved - unique)); 2973 ds->ds_reserved = newval; 2974 mutex_exit(&ds->ds_lock); 2975 2976 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 2977 mutex_exit(&ds->ds_dir->dd_lock); 2978 } 2979 2980 static void 2981 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 2982 { 2983 dsl_dataset_set_qr_arg_t *ddsqra = arg; 2984 dsl_pool_t *dp = dmu_tx_pool(tx); 2985 dsl_dataset_t *ds; 2986 2987 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 2988 dsl_dataset_set_refreservation_sync_impl(ds, 2989 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 2990 dsl_dataset_rele(ds, FTAG); 2991 } 2992 2993 int 2994 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 2995 uint64_t refreservation) 2996 { 2997 dsl_dataset_set_qr_arg_t ddsqra; 2998 2999 ddsqra.ddsqra_name = dsname; 3000 ddsqra.ddsqra_source = source; 3001 ddsqra.ddsqra_value = refreservation; 3002 3003 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3004 dsl_dataset_set_refreservation_sync, &ddsqra, 3005 0, ZFS_SPACE_CHECK_NONE)); 3006 } 3007 3008 /* 3009 * Return (in *usedp) the amount of space written in new that is not 3010 * present in oldsnap. New may be a snapshot or the head. Old must be 3011 * a snapshot before new, in new's filesystem (or its origin). If not then 3012 * fail and return EINVAL. 3013 * 3014 * The written space is calculated by considering two components: First, we 3015 * ignore any freed space, and calculate the written as new's used space 3016 * minus old's used space. Next, we add in the amount of space that was freed 3017 * between the two snapshots, thus reducing new's used space relative to old's. 3018 * Specifically, this is the space that was born before old->ds_creation_txg, 3019 * and freed before new (ie. on new's deadlist or a previous deadlist). 3020 * 3021 * space freed [---------------------] 3022 * snapshots ---O-------O--------O-------O------ 3023 * oldsnap new 3024 */ 3025 int 3026 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3027 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3028 { 3029 int err = 0; 3030 uint64_t snapobj; 3031 dsl_pool_t *dp = new->ds_dir->dd_pool; 3032 3033 ASSERT(dsl_pool_config_held(dp)); 3034 3035 *usedp = 0; 3036 *usedp += new->ds_phys->ds_referenced_bytes; 3037 *usedp -= oldsnap->ds_phys->ds_referenced_bytes; 3038 3039 *compp = 0; 3040 *compp += new->ds_phys->ds_compressed_bytes; 3041 *compp -= oldsnap->ds_phys->ds_compressed_bytes; 3042 3043 *uncompp = 0; 3044 *uncompp += new->ds_phys->ds_uncompressed_bytes; 3045 *uncompp -= oldsnap->ds_phys->ds_uncompressed_bytes; 3046 3047 snapobj = new->ds_object; 3048 while (snapobj != oldsnap->ds_object) { 3049 dsl_dataset_t *snap; 3050 uint64_t used, comp, uncomp; 3051 3052 if (snapobj == new->ds_object) { 3053 snap = new; 3054 } else { 3055 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3056 if (err != 0) 3057 break; 3058 } 3059 3060 if (snap->ds_phys->ds_prev_snap_txg == 3061 oldsnap->ds_phys->ds_creation_txg) { 3062 /* 3063 * The blocks in the deadlist can not be born after 3064 * ds_prev_snap_txg, so get the whole deadlist space, 3065 * which is more efficient (especially for old-format 3066 * deadlists). Unfortunately the deadlist code 3067 * doesn't have enough information to make this 3068 * optimization itself. 3069 */ 3070 dsl_deadlist_space(&snap->ds_deadlist, 3071 &used, &comp, &uncomp); 3072 } else { 3073 dsl_deadlist_space_range(&snap->ds_deadlist, 3074 0, oldsnap->ds_phys->ds_creation_txg, 3075 &used, &comp, &uncomp); 3076 } 3077 *usedp += used; 3078 *compp += comp; 3079 *uncompp += uncomp; 3080 3081 /* 3082 * If we get to the beginning of the chain of snapshots 3083 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3084 * was not a snapshot of/before new. 3085 */ 3086 snapobj = snap->ds_phys->ds_prev_snap_obj; 3087 if (snap != new) 3088 dsl_dataset_rele(snap, FTAG); 3089 if (snapobj == 0) { 3090 err = SET_ERROR(EINVAL); 3091 break; 3092 } 3093 3094 } 3095 return (err); 3096 } 3097 3098 /* 3099 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3100 * lastsnap, and all snapshots in between are deleted. 3101 * 3102 * blocks that would be freed [---------------------------] 3103 * snapshots ---O-------O--------O-------O--------O 3104 * firstsnap lastsnap 3105 * 3106 * This is the set of blocks that were born after the snap before firstsnap, 3107 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3108 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3109 * We calculate this by iterating over the relevant deadlists (from the snap 3110 * after lastsnap, backward to the snap after firstsnap), summing up the 3111 * space on the deadlist that was born after the snap before firstsnap. 3112 */ 3113 int 3114 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3115 dsl_dataset_t *lastsnap, 3116 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3117 { 3118 int err = 0; 3119 uint64_t snapobj; 3120 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3121 3122 ASSERT(dsl_dataset_is_snapshot(firstsnap)); 3123 ASSERT(dsl_dataset_is_snapshot(lastsnap)); 3124 3125 /* 3126 * Check that the snapshots are in the same dsl_dir, and firstsnap 3127 * is before lastsnap. 3128 */ 3129 if (firstsnap->ds_dir != lastsnap->ds_dir || 3130 firstsnap->ds_phys->ds_creation_txg > 3131 lastsnap->ds_phys->ds_creation_txg) 3132 return (SET_ERROR(EINVAL)); 3133 3134 *usedp = *compp = *uncompp = 0; 3135 3136 snapobj = lastsnap->ds_phys->ds_next_snap_obj; 3137 while (snapobj != firstsnap->ds_object) { 3138 dsl_dataset_t *ds; 3139 uint64_t used, comp, uncomp; 3140 3141 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3142 if (err != 0) 3143 break; 3144 3145 dsl_deadlist_space_range(&ds->ds_deadlist, 3146 firstsnap->ds_phys->ds_prev_snap_txg, UINT64_MAX, 3147 &used, &comp, &uncomp); 3148 *usedp += used; 3149 *compp += comp; 3150 *uncompp += uncomp; 3151 3152 snapobj = ds->ds_phys->ds_prev_snap_obj; 3153 ASSERT3U(snapobj, !=, 0); 3154 dsl_dataset_rele(ds, FTAG); 3155 } 3156 return (err); 3157 } 3158 3159 static int 3160 dsl_dataset_activate_large_blocks_check(void *arg, dmu_tx_t *tx) 3161 { 3162 const char *dsname = arg; 3163 dsl_dataset_t *ds; 3164 dsl_pool_t *dp = dmu_tx_pool(tx); 3165 int error = 0; 3166 3167 if (!spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LARGE_BLOCKS)) 3168 return (SET_ERROR(ENOTSUP)); 3169 3170 ASSERT(spa_feature_is_enabled(dp->dp_spa, 3171 SPA_FEATURE_EXTENSIBLE_DATASET)); 3172 3173 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 3174 if (error != 0) 3175 return (error); 3176 3177 if (ds->ds_large_blocks) 3178 error = EALREADY; 3179 dsl_dataset_rele(ds, FTAG); 3180 3181 return (error); 3182 } 3183 3184 void 3185 dsl_dataset_activate_large_blocks_sync_impl(uint64_t dsobj, dmu_tx_t *tx) 3186 { 3187 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 3188 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 3189 uint64_t zero = 0; 3190 3191 spa_feature_incr(spa, SPA_FEATURE_LARGE_BLOCKS, tx); 3192 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 3193 3194 VERIFY0(zap_add(mos, dsobj, DS_FIELD_LARGE_BLOCKS, 3195 sizeof (zero), 1, &zero, tx)); 3196 } 3197 3198 static void 3199 dsl_dataset_activate_large_blocks_sync(void *arg, dmu_tx_t *tx) 3200 { 3201 const char *dsname = arg; 3202 dsl_dataset_t *ds; 3203 3204 VERIFY0(dsl_dataset_hold(dmu_tx_pool(tx), dsname, FTAG, &ds)); 3205 3206 dsl_dataset_activate_large_blocks_sync_impl(ds->ds_object, tx); 3207 ASSERT(!ds->ds_large_blocks); 3208 ds->ds_large_blocks = B_TRUE; 3209 dsl_dataset_rele(ds, FTAG); 3210 } 3211 3212 int 3213 dsl_dataset_activate_large_blocks(const char *dsname) 3214 { 3215 int error; 3216 3217 error = dsl_sync_task(dsname, 3218 dsl_dataset_activate_large_blocks_check, 3219 dsl_dataset_activate_large_blocks_sync, (void *)dsname, 3220 1, ZFS_SPACE_CHECK_RESERVED); 3221 3222 /* 3223 * EALREADY indicates that this dataset already supports large blocks. 3224 */ 3225 if (error == EALREADY) 3226 error = 0; 3227 return (error); 3228 } 3229 3230 /* 3231 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3232 * For example, they could both be snapshots of the same filesystem, and 3233 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3234 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3235 * filesystem. Or 'earlier' could be the origin's origin. 3236 * 3237 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3238 */ 3239 boolean_t 3240 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3241 uint64_t earlier_txg) 3242 { 3243 dsl_pool_t *dp = later->ds_dir->dd_pool; 3244 int error; 3245 boolean_t ret; 3246 3247 ASSERT(dsl_pool_config_held(dp)); 3248 ASSERT(dsl_dataset_is_snapshot(earlier) || earlier_txg != 0); 3249 3250 if (earlier_txg == 0) 3251 earlier_txg = earlier->ds_phys->ds_creation_txg; 3252 3253 if (dsl_dataset_is_snapshot(later) && 3254 earlier_txg >= later->ds_phys->ds_creation_txg) 3255 return (B_FALSE); 3256 3257 if (later->ds_dir == earlier->ds_dir) 3258 return (B_TRUE); 3259 if (!dsl_dir_is_clone(later->ds_dir)) 3260 return (B_FALSE); 3261 3262 if (later->ds_dir->dd_phys->dd_origin_obj == earlier->ds_object) 3263 return (B_TRUE); 3264 dsl_dataset_t *origin; 3265 error = dsl_dataset_hold_obj(dp, 3266 later->ds_dir->dd_phys->dd_origin_obj, FTAG, &origin); 3267 if (error != 0) 3268 return (B_FALSE); 3269 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3270 dsl_dataset_rele(origin, FTAG); 3271 return (ret); 3272 } 3273 3274 3275 void 3276 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3277 { 3278 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3279 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3280 } 3281