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, 2015 by Delphix. All rights reserved. 24 * Copyright (c) 2014, Joyent, Inc. All rights reserved. 25 * Copyright (c) 2014 RackTop Systems. 26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 27 * Copyright (c) 2014 Integros [integros.com] 28 * Copyright 2016, OmniTI Computer Consulting, Inc. All rights reserved. 29 */ 30 31 #include <sys/dmu_objset.h> 32 #include <sys/dsl_dataset.h> 33 #include <sys/dsl_dir.h> 34 #include <sys/dsl_prop.h> 35 #include <sys/dsl_synctask.h> 36 #include <sys/dmu_traverse.h> 37 #include <sys/dmu_impl.h> 38 #include <sys/dmu_tx.h> 39 #include <sys/arc.h> 40 #include <sys/zio.h> 41 #include <sys/zap.h> 42 #include <sys/zfeature.h> 43 #include <sys/unique.h> 44 #include <sys/zfs_context.h> 45 #include <sys/zfs_ioctl.h> 46 #include <sys/spa.h> 47 #include <sys/zfs_znode.h> 48 #include <sys/zfs_onexit.h> 49 #include <sys/zvol.h> 50 #include <sys/dsl_scan.h> 51 #include <sys/dsl_deadlist.h> 52 #include <sys/dsl_destroy.h> 53 #include <sys/dsl_userhold.h> 54 #include <sys/dsl_bookmark.h> 55 #include <sys/dmu_send.h> 56 #include <sys/zio_checksum.h> 57 #include <sys/zio_compress.h> 58 #include <zfs_fletcher.h> 59 60 /* 61 * The SPA supports block sizes up to 16MB. However, very large blocks 62 * can have an impact on i/o latency (e.g. tying up a spinning disk for 63 * ~300ms), and also potentially on the memory allocator. Therefore, 64 * we do not allow the recordsize to be set larger than zfs_max_recordsize 65 * (default 1MB). Larger blocks can be created by changing this tunable, 66 * and pools with larger blocks can always be imported and used, regardless 67 * of this setting. 68 */ 69 int zfs_max_recordsize = 1 * 1024 * 1024; 70 71 #define SWITCH64(x, y) \ 72 { \ 73 uint64_t __tmp = (x); \ 74 (x) = (y); \ 75 (y) = __tmp; \ 76 } 77 78 #define DS_REF_MAX (1ULL << 62) 79 80 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 81 82 extern int spa_asize_inflation; 83 84 /* 85 * Figure out how much of this delta should be propogated to the dsl_dir 86 * layer. If there's a refreservation, that space has already been 87 * partially accounted for in our ancestors. 88 */ 89 static int64_t 90 parent_delta(dsl_dataset_t *ds, int64_t delta) 91 { 92 dsl_dataset_phys_t *ds_phys; 93 uint64_t old_bytes, new_bytes; 94 95 if (ds->ds_reserved == 0) 96 return (delta); 97 98 ds_phys = dsl_dataset_phys(ds); 99 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 100 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 101 102 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 103 return (new_bytes - old_bytes); 104 } 105 106 void 107 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 108 { 109 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 110 int compressed = BP_GET_PSIZE(bp); 111 int uncompressed = BP_GET_UCSIZE(bp); 112 int64_t delta; 113 114 dprintf_bp(bp, "ds=%p", ds); 115 116 ASSERT(dmu_tx_is_syncing(tx)); 117 /* It could have been compressed away to nothing */ 118 if (BP_IS_HOLE(bp)) 119 return; 120 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 121 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 122 if (ds == NULL) { 123 dsl_pool_mos_diduse_space(tx->tx_pool, 124 used, compressed, uncompressed); 125 return; 126 } 127 128 dmu_buf_will_dirty(ds->ds_dbuf, tx); 129 mutex_enter(&ds->ds_lock); 130 delta = parent_delta(ds, used); 131 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 132 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 133 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 134 dsl_dataset_phys(ds)->ds_unique_bytes += used; 135 136 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 137 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 138 B_TRUE; 139 } 140 141 spa_feature_t f = zio_checksum_to_feature(BP_GET_CHECKSUM(bp)); 142 if (f != SPA_FEATURE_NONE) 143 ds->ds_feature_activation_needed[f] = B_TRUE; 144 145 mutex_exit(&ds->ds_lock); 146 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 147 compressed, uncompressed, tx); 148 dsl_dir_transfer_space(ds->ds_dir, used - delta, 149 DD_USED_REFRSRV, DD_USED_HEAD, tx); 150 } 151 152 int 153 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 154 boolean_t async) 155 { 156 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 157 int compressed = BP_GET_PSIZE(bp); 158 int uncompressed = BP_GET_UCSIZE(bp); 159 160 if (BP_IS_HOLE(bp)) 161 return (0); 162 163 ASSERT(dmu_tx_is_syncing(tx)); 164 ASSERT(bp->blk_birth <= tx->tx_txg); 165 166 if (ds == NULL) { 167 dsl_free(tx->tx_pool, tx->tx_txg, bp); 168 dsl_pool_mos_diduse_space(tx->tx_pool, 169 -used, -compressed, -uncompressed); 170 return (used); 171 } 172 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 173 174 ASSERT(!ds->ds_is_snapshot); 175 dmu_buf_will_dirty(ds->ds_dbuf, tx); 176 177 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 178 int64_t delta; 179 180 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 181 dsl_free(tx->tx_pool, tx->tx_txg, bp); 182 183 mutex_enter(&ds->ds_lock); 184 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 185 !DS_UNIQUE_IS_ACCURATE(ds)); 186 delta = parent_delta(ds, -used); 187 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 188 mutex_exit(&ds->ds_lock); 189 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 190 delta, -compressed, -uncompressed, tx); 191 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 192 DD_USED_REFRSRV, DD_USED_HEAD, tx); 193 } else { 194 dprintf_bp(bp, "putting on dead list: %s", ""); 195 if (async) { 196 /* 197 * We are here as part of zio's write done callback, 198 * which means we're a zio interrupt thread. We can't 199 * call dsl_deadlist_insert() now because it may block 200 * waiting for I/O. Instead, put bp on the deferred 201 * queue and let dsl_pool_sync() finish the job. 202 */ 203 bplist_append(&ds->ds_pending_deadlist, bp); 204 } else { 205 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 206 } 207 ASSERT3U(ds->ds_prev->ds_object, ==, 208 dsl_dataset_phys(ds)->ds_prev_snap_obj); 209 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 210 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 211 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 212 ds->ds_object && bp->blk_birth > 213 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 214 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 215 mutex_enter(&ds->ds_prev->ds_lock); 216 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 217 mutex_exit(&ds->ds_prev->ds_lock); 218 } 219 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 220 dsl_dir_transfer_space(ds->ds_dir, used, 221 DD_USED_HEAD, DD_USED_SNAP, tx); 222 } 223 } 224 mutex_enter(&ds->ds_lock); 225 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 226 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 227 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 228 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 229 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 230 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 231 mutex_exit(&ds->ds_lock); 232 233 return (used); 234 } 235 236 uint64_t 237 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 238 { 239 uint64_t trysnap = 0; 240 241 if (ds == NULL) 242 return (0); 243 /* 244 * The snapshot creation could fail, but that would cause an 245 * incorrect FALSE return, which would only result in an 246 * overestimation of the amount of space that an operation would 247 * consume, which is OK. 248 * 249 * There's also a small window where we could miss a pending 250 * snapshot, because we could set the sync task in the quiescing 251 * phase. So this should only be used as a guess. 252 */ 253 if (ds->ds_trysnap_txg > 254 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 255 trysnap = ds->ds_trysnap_txg; 256 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 257 } 258 259 boolean_t 260 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 261 uint64_t blk_birth) 262 { 263 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 264 (bp != NULL && BP_IS_HOLE(bp))) 265 return (B_FALSE); 266 267 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 268 269 return (B_TRUE); 270 } 271 272 static void 273 dsl_dataset_evict(void *dbu) 274 { 275 dsl_dataset_t *ds = dbu; 276 277 ASSERT(ds->ds_owner == NULL); 278 279 ds->ds_dbuf = NULL; 280 281 unique_remove(ds->ds_fsid_guid); 282 283 if (ds->ds_objset != NULL) 284 dmu_objset_evict(ds->ds_objset); 285 286 if (ds->ds_prev) { 287 dsl_dataset_rele(ds->ds_prev, ds); 288 ds->ds_prev = NULL; 289 } 290 291 bplist_destroy(&ds->ds_pending_deadlist); 292 if (ds->ds_deadlist.dl_os != NULL) 293 dsl_deadlist_close(&ds->ds_deadlist); 294 if (ds->ds_dir) 295 dsl_dir_async_rele(ds->ds_dir, ds); 296 297 ASSERT(!list_link_active(&ds->ds_synced_link)); 298 299 list_destroy(&ds->ds_prop_cbs); 300 mutex_destroy(&ds->ds_lock); 301 mutex_destroy(&ds->ds_opening_lock); 302 mutex_destroy(&ds->ds_sendstream_lock); 303 refcount_destroy(&ds->ds_longholds); 304 305 kmem_free(ds, sizeof (dsl_dataset_t)); 306 } 307 308 int 309 dsl_dataset_get_snapname(dsl_dataset_t *ds) 310 { 311 dsl_dataset_phys_t *headphys; 312 int err; 313 dmu_buf_t *headdbuf; 314 dsl_pool_t *dp = ds->ds_dir->dd_pool; 315 objset_t *mos = dp->dp_meta_objset; 316 317 if (ds->ds_snapname[0]) 318 return (0); 319 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 320 return (0); 321 322 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 323 FTAG, &headdbuf); 324 if (err != 0) 325 return (err); 326 headphys = headdbuf->db_data; 327 err = zap_value_search(dp->dp_meta_objset, 328 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 329 dmu_buf_rele(headdbuf, FTAG); 330 return (err); 331 } 332 333 int 334 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 335 { 336 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 337 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 338 matchtype_t mt; 339 int err; 340 341 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 342 mt = MT_FIRST; 343 else 344 mt = MT_EXACT; 345 346 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 347 value, mt, NULL, 0, NULL); 348 if (err == ENOTSUP && mt == MT_FIRST) 349 err = zap_lookup(mos, snapobj, name, 8, 1, value); 350 return (err); 351 } 352 353 int 354 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 355 boolean_t adj_cnt) 356 { 357 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 358 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 359 matchtype_t mt; 360 int err; 361 362 dsl_dir_snap_cmtime_update(ds->ds_dir); 363 364 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 365 mt = MT_FIRST; 366 else 367 mt = MT_EXACT; 368 369 err = zap_remove_norm(mos, snapobj, name, mt, tx); 370 if (err == ENOTSUP && mt == MT_FIRST) 371 err = zap_remove(mos, snapobj, name, tx); 372 373 if (err == 0 && adj_cnt) 374 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 375 DD_FIELD_SNAPSHOT_COUNT, tx); 376 377 return (err); 378 } 379 380 boolean_t 381 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 382 { 383 dmu_buf_t *dbuf = ds->ds_dbuf; 384 boolean_t result = B_FALSE; 385 386 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 387 ds->ds_object, DMU_BONUS_BLKID, tag)) { 388 389 if (ds == dmu_buf_get_user(dbuf)) 390 result = B_TRUE; 391 else 392 dmu_buf_rele(dbuf, tag); 393 } 394 395 return (result); 396 } 397 398 int 399 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 400 dsl_dataset_t **dsp) 401 { 402 objset_t *mos = dp->dp_meta_objset; 403 dmu_buf_t *dbuf; 404 dsl_dataset_t *ds; 405 int err; 406 dmu_object_info_t doi; 407 408 ASSERT(dsl_pool_config_held(dp)); 409 410 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 411 if (err != 0) 412 return (err); 413 414 /* Make sure dsobj has the correct object type. */ 415 dmu_object_info_from_db(dbuf, &doi); 416 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 417 dmu_buf_rele(dbuf, tag); 418 return (SET_ERROR(EINVAL)); 419 } 420 421 ds = dmu_buf_get_user(dbuf); 422 if (ds == NULL) { 423 dsl_dataset_t *winner = NULL; 424 425 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 426 ds->ds_dbuf = dbuf; 427 ds->ds_object = dsobj; 428 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 429 430 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 431 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 432 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 433 refcount_create(&ds->ds_longholds); 434 435 bplist_create(&ds->ds_pending_deadlist); 436 dsl_deadlist_open(&ds->ds_deadlist, 437 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 438 439 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 440 offsetof(dmu_sendarg_t, dsa_link)); 441 442 list_create(&ds->ds_prop_cbs, sizeof (dsl_prop_cb_record_t), 443 offsetof(dsl_prop_cb_record_t, cbr_ds_node)); 444 445 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 446 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 447 if (!(spa_feature_table[f].fi_flags & 448 ZFEATURE_FLAG_PER_DATASET)) 449 continue; 450 err = zap_contains(mos, dsobj, 451 spa_feature_table[f].fi_guid); 452 if (err == 0) { 453 ds->ds_feature_inuse[f] = B_TRUE; 454 } else { 455 ASSERT3U(err, ==, ENOENT); 456 err = 0; 457 } 458 } 459 } 460 461 err = dsl_dir_hold_obj(dp, 462 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 463 if (err != 0) { 464 mutex_destroy(&ds->ds_lock); 465 mutex_destroy(&ds->ds_opening_lock); 466 mutex_destroy(&ds->ds_sendstream_lock); 467 refcount_destroy(&ds->ds_longholds); 468 bplist_destroy(&ds->ds_pending_deadlist); 469 dsl_deadlist_close(&ds->ds_deadlist); 470 kmem_free(ds, sizeof (dsl_dataset_t)); 471 dmu_buf_rele(dbuf, tag); 472 return (err); 473 } 474 475 if (!ds->ds_is_snapshot) { 476 ds->ds_snapname[0] = '\0'; 477 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 478 err = dsl_dataset_hold_obj(dp, 479 dsl_dataset_phys(ds)->ds_prev_snap_obj, 480 ds, &ds->ds_prev); 481 } 482 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 483 int zaperr = zap_lookup(mos, ds->ds_object, 484 DS_FIELD_BOOKMARK_NAMES, 485 sizeof (ds->ds_bookmarks), 1, 486 &ds->ds_bookmarks); 487 if (zaperr != ENOENT) 488 VERIFY0(zaperr); 489 } 490 } else { 491 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 492 err = dsl_dataset_get_snapname(ds); 493 if (err == 0 && 494 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 495 err = zap_count( 496 ds->ds_dir->dd_pool->dp_meta_objset, 497 dsl_dataset_phys(ds)->ds_userrefs_obj, 498 &ds->ds_userrefs); 499 } 500 } 501 502 if (err == 0 && !ds->ds_is_snapshot) { 503 err = dsl_prop_get_int_ds(ds, 504 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 505 &ds->ds_reserved); 506 if (err == 0) { 507 err = dsl_prop_get_int_ds(ds, 508 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 509 &ds->ds_quota); 510 } 511 } else { 512 ds->ds_reserved = ds->ds_quota = 0; 513 } 514 515 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 516 if (err == 0) 517 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 518 519 if (err != 0 || winner != NULL) { 520 bplist_destroy(&ds->ds_pending_deadlist); 521 dsl_deadlist_close(&ds->ds_deadlist); 522 if (ds->ds_prev) 523 dsl_dataset_rele(ds->ds_prev, ds); 524 dsl_dir_rele(ds->ds_dir, ds); 525 mutex_destroy(&ds->ds_lock); 526 mutex_destroy(&ds->ds_opening_lock); 527 mutex_destroy(&ds->ds_sendstream_lock); 528 refcount_destroy(&ds->ds_longholds); 529 kmem_free(ds, sizeof (dsl_dataset_t)); 530 if (err != 0) { 531 dmu_buf_rele(dbuf, tag); 532 return (err); 533 } 534 ds = winner; 535 } else { 536 ds->ds_fsid_guid = 537 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 538 } 539 } 540 ASSERT3P(ds->ds_dbuf, ==, dbuf); 541 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 542 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 543 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 544 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 545 *dsp = ds; 546 return (0); 547 } 548 549 int 550 dsl_dataset_hold(dsl_pool_t *dp, const char *name, 551 void *tag, dsl_dataset_t **dsp) 552 { 553 dsl_dir_t *dd; 554 const char *snapname; 555 uint64_t obj; 556 int err = 0; 557 dsl_dataset_t *ds; 558 559 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 560 if (err != 0) 561 return (err); 562 563 ASSERT(dsl_pool_config_held(dp)); 564 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 565 if (obj != 0) 566 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 567 else 568 err = SET_ERROR(ENOENT); 569 570 /* we may be looking for a snapshot */ 571 if (err == 0 && snapname != NULL) { 572 dsl_dataset_t *snap_ds; 573 574 if (*snapname++ != '@') { 575 dsl_dataset_rele(ds, tag); 576 dsl_dir_rele(dd, FTAG); 577 return (SET_ERROR(ENOENT)); 578 } 579 580 dprintf("looking for snapshot '%s'\n", snapname); 581 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 582 if (err == 0) 583 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 584 dsl_dataset_rele(ds, tag); 585 586 if (err == 0) { 587 mutex_enter(&snap_ds->ds_lock); 588 if (snap_ds->ds_snapname[0] == 0) 589 (void) strlcpy(snap_ds->ds_snapname, snapname, 590 sizeof (snap_ds->ds_snapname)); 591 mutex_exit(&snap_ds->ds_lock); 592 ds = snap_ds; 593 } 594 } 595 if (err == 0) 596 *dsp = ds; 597 dsl_dir_rele(dd, FTAG); 598 return (err); 599 } 600 601 int 602 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 603 void *tag, dsl_dataset_t **dsp) 604 { 605 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 606 if (err != 0) 607 return (err); 608 if (!dsl_dataset_tryown(*dsp, tag)) { 609 dsl_dataset_rele(*dsp, tag); 610 *dsp = NULL; 611 return (SET_ERROR(EBUSY)); 612 } 613 return (0); 614 } 615 616 int 617 dsl_dataset_own(dsl_pool_t *dp, const char *name, 618 void *tag, dsl_dataset_t **dsp) 619 { 620 int err = dsl_dataset_hold(dp, name, tag, dsp); 621 if (err != 0) 622 return (err); 623 if (!dsl_dataset_tryown(*dsp, tag)) { 624 dsl_dataset_rele(*dsp, tag); 625 return (SET_ERROR(EBUSY)); 626 } 627 return (0); 628 } 629 630 /* 631 * See the comment above dsl_pool_hold() for details. In summary, a long 632 * hold is used to prevent destruction of a dataset while the pool hold 633 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 634 * 635 * The dataset and pool must be held when this function is called. After it 636 * is called, the pool hold may be released while the dataset is still held 637 * and accessed. 638 */ 639 void 640 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 641 { 642 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 643 (void) refcount_add(&ds->ds_longholds, tag); 644 } 645 646 void 647 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 648 { 649 (void) refcount_remove(&ds->ds_longholds, tag); 650 } 651 652 /* Return B_TRUE if there are any long holds on this dataset. */ 653 boolean_t 654 dsl_dataset_long_held(dsl_dataset_t *ds) 655 { 656 return (!refcount_is_zero(&ds->ds_longholds)); 657 } 658 659 void 660 dsl_dataset_name(dsl_dataset_t *ds, char *name) 661 { 662 if (ds == NULL) { 663 (void) strcpy(name, "mos"); 664 } else { 665 dsl_dir_name(ds->ds_dir, name); 666 VERIFY0(dsl_dataset_get_snapname(ds)); 667 if (ds->ds_snapname[0]) { 668 (void) strcat(name, "@"); 669 /* 670 * We use a "recursive" mutex so that we 671 * can call dprintf_ds() with ds_lock held. 672 */ 673 if (!MUTEX_HELD(&ds->ds_lock)) { 674 mutex_enter(&ds->ds_lock); 675 (void) strcat(name, ds->ds_snapname); 676 mutex_exit(&ds->ds_lock); 677 } else { 678 (void) strcat(name, ds->ds_snapname); 679 } 680 } 681 } 682 } 683 684 void 685 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 686 { 687 dmu_buf_rele(ds->ds_dbuf, tag); 688 } 689 690 void 691 dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 692 { 693 ASSERT3P(ds->ds_owner, ==, tag); 694 ASSERT(ds->ds_dbuf != NULL); 695 696 mutex_enter(&ds->ds_lock); 697 ds->ds_owner = NULL; 698 mutex_exit(&ds->ds_lock); 699 dsl_dataset_long_rele(ds, tag); 700 dsl_dataset_rele(ds, tag); 701 } 702 703 boolean_t 704 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 705 { 706 boolean_t gotit = FALSE; 707 708 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 709 mutex_enter(&ds->ds_lock); 710 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 711 ds->ds_owner = tag; 712 dsl_dataset_long_hold(ds, tag); 713 gotit = TRUE; 714 } 715 mutex_exit(&ds->ds_lock); 716 return (gotit); 717 } 718 719 boolean_t 720 dsl_dataset_has_owner(dsl_dataset_t *ds) 721 { 722 boolean_t rv; 723 mutex_enter(&ds->ds_lock); 724 rv = (ds->ds_owner != NULL); 725 mutex_exit(&ds->ds_lock); 726 return (rv); 727 } 728 729 static void 730 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 731 { 732 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 733 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 734 uint64_t zero = 0; 735 736 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 737 738 spa_feature_incr(spa, f, tx); 739 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 740 741 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 742 sizeof (zero), 1, &zero, tx)); 743 } 744 745 void 746 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 747 { 748 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 749 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 750 751 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 752 753 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 754 spa_feature_decr(spa, f, tx); 755 } 756 757 uint64_t 758 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 759 uint64_t flags, dmu_tx_t *tx) 760 { 761 dsl_pool_t *dp = dd->dd_pool; 762 dmu_buf_t *dbuf; 763 dsl_dataset_phys_t *dsphys; 764 uint64_t dsobj; 765 objset_t *mos = dp->dp_meta_objset; 766 767 if (origin == NULL) 768 origin = dp->dp_origin_snap; 769 770 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 771 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 772 ASSERT(dmu_tx_is_syncing(tx)); 773 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 774 775 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 776 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 777 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 778 dmu_buf_will_dirty(dbuf, tx); 779 dsphys = dbuf->db_data; 780 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 781 dsphys->ds_dir_obj = dd->dd_object; 782 dsphys->ds_flags = flags; 783 dsphys->ds_fsid_guid = unique_create(); 784 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 785 sizeof (dsphys->ds_guid)); 786 dsphys->ds_snapnames_zapobj = 787 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 788 DMU_OT_NONE, 0, tx); 789 dsphys->ds_creation_time = gethrestime_sec(); 790 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 791 792 if (origin == NULL) { 793 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 794 } else { 795 dsl_dataset_t *ohds; /* head of the origin snapshot */ 796 797 dsphys->ds_prev_snap_obj = origin->ds_object; 798 dsphys->ds_prev_snap_txg = 799 dsl_dataset_phys(origin)->ds_creation_txg; 800 dsphys->ds_referenced_bytes = 801 dsl_dataset_phys(origin)->ds_referenced_bytes; 802 dsphys->ds_compressed_bytes = 803 dsl_dataset_phys(origin)->ds_compressed_bytes; 804 dsphys->ds_uncompressed_bytes = 805 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 806 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 807 808 /* 809 * Inherit flags that describe the dataset's contents 810 * (INCONSISTENT) or properties (Case Insensitive). 811 */ 812 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 813 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 814 815 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 816 if (origin->ds_feature_inuse[f]) 817 dsl_dataset_activate_feature(dsobj, f, tx); 818 } 819 820 dmu_buf_will_dirty(origin->ds_dbuf, tx); 821 dsl_dataset_phys(origin)->ds_num_children++; 822 823 VERIFY0(dsl_dataset_hold_obj(dp, 824 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 825 FTAG, &ohds)); 826 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 827 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 828 dsl_dataset_rele(ohds, FTAG); 829 830 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 831 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 832 dsl_dataset_phys(origin)->ds_next_clones_obj = 833 zap_create(mos, 834 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 835 } 836 VERIFY0(zap_add_int(mos, 837 dsl_dataset_phys(origin)->ds_next_clones_obj, 838 dsobj, tx)); 839 } 840 841 dmu_buf_will_dirty(dd->dd_dbuf, tx); 842 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 843 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 844 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 845 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 846 dsl_dir_phys(origin->ds_dir)->dd_clones = 847 zap_create(mos, 848 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 849 } 850 VERIFY0(zap_add_int(mos, 851 dsl_dir_phys(origin->ds_dir)->dd_clones, 852 dsobj, tx)); 853 } 854 } 855 856 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 857 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 858 859 dmu_buf_rele(dbuf, FTAG); 860 861 dmu_buf_will_dirty(dd->dd_dbuf, tx); 862 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 863 864 return (dsobj); 865 } 866 867 static void 868 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 869 { 870 objset_t *os; 871 872 VERIFY0(dmu_objset_from_ds(ds, &os)); 873 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 874 dsl_dataset_dirty(ds, tx); 875 } 876 877 uint64_t 878 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 879 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 880 { 881 dsl_pool_t *dp = pdd->dd_pool; 882 uint64_t dsobj, ddobj; 883 dsl_dir_t *dd; 884 885 ASSERT(dmu_tx_is_syncing(tx)); 886 ASSERT(lastname[0] != '@'); 887 888 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 889 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 890 891 dsobj = dsl_dataset_create_sync_dd(dd, origin, 892 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 893 894 dsl_deleg_set_create_perms(dd, tx, cr); 895 896 /* 897 * Since we're creating a new node we know it's a leaf, so we can 898 * initialize the counts if the limit feature is active. 899 */ 900 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 901 uint64_t cnt = 0; 902 objset_t *os = dd->dd_pool->dp_meta_objset; 903 904 dsl_dir_zapify(dd, tx); 905 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 906 sizeof (cnt), 1, &cnt, tx)); 907 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 908 sizeof (cnt), 1, &cnt, tx)); 909 } 910 911 dsl_dir_rele(dd, FTAG); 912 913 /* 914 * If we are creating a clone, make sure we zero out any stale 915 * data from the origin snapshots zil header. 916 */ 917 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 918 dsl_dataset_t *ds; 919 920 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 921 dsl_dataset_zero_zil(ds, tx); 922 dsl_dataset_rele(ds, FTAG); 923 } 924 925 return (dsobj); 926 } 927 928 /* 929 * The unique space in the head dataset can be calculated by subtracting 930 * the space used in the most recent snapshot, that is still being used 931 * in this file system, from the space currently in use. To figure out 932 * the space in the most recent snapshot still in use, we need to take 933 * the total space used in the snapshot and subtract out the space that 934 * has been freed up since the snapshot was taken. 935 */ 936 void 937 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 938 { 939 uint64_t mrs_used; 940 uint64_t dlused, dlcomp, dluncomp; 941 942 ASSERT(!ds->ds_is_snapshot); 943 944 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 945 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 946 else 947 mrs_used = 0; 948 949 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 950 951 ASSERT3U(dlused, <=, mrs_used); 952 dsl_dataset_phys(ds)->ds_unique_bytes = 953 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 954 955 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 956 SPA_VERSION_UNIQUE_ACCURATE) 957 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 958 } 959 960 void 961 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 962 dmu_tx_t *tx) 963 { 964 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 965 uint64_t count; 966 int err; 967 968 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 969 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 970 obj, tx); 971 /* 972 * The err should not be ENOENT, but a bug in a previous version 973 * of the code could cause upgrade_clones_cb() to not set 974 * ds_next_snap_obj when it should, leading to a missing entry. 975 * If we knew that the pool was created after 976 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 977 * ENOENT. However, at least we can check that we don't have 978 * too many entries in the next_clones_obj even after failing to 979 * remove this one. 980 */ 981 if (err != ENOENT) 982 VERIFY0(err); 983 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 984 &count)); 985 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 986 } 987 988 989 blkptr_t * 990 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 991 { 992 return (&dsl_dataset_phys(ds)->ds_bp); 993 } 994 995 void 996 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 997 { 998 ASSERT(dmu_tx_is_syncing(tx)); 999 /* If it's the meta-objset, set dp_meta_rootbp */ 1000 if (ds == NULL) { 1001 tx->tx_pool->dp_meta_rootbp = *bp; 1002 } else { 1003 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1004 dsl_dataset_phys(ds)->ds_bp = *bp; 1005 } 1006 } 1007 1008 spa_t * 1009 dsl_dataset_get_spa(dsl_dataset_t *ds) 1010 { 1011 return (ds->ds_dir->dd_pool->dp_spa); 1012 } 1013 1014 void 1015 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1016 { 1017 dsl_pool_t *dp; 1018 1019 if (ds == NULL) /* this is the meta-objset */ 1020 return; 1021 1022 ASSERT(ds->ds_objset != NULL); 1023 1024 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1025 panic("dirtying snapshot!"); 1026 1027 dp = ds->ds_dir->dd_pool; 1028 1029 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1030 /* up the hold count until we can be written out */ 1031 dmu_buf_add_ref(ds->ds_dbuf, ds); 1032 } 1033 } 1034 1035 boolean_t 1036 dsl_dataset_is_dirty(dsl_dataset_t *ds) 1037 { 1038 for (int t = 0; t < TXG_SIZE; t++) { 1039 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1040 ds, t)) 1041 return (B_TRUE); 1042 } 1043 return (B_FALSE); 1044 } 1045 1046 static int 1047 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1048 { 1049 uint64_t asize; 1050 1051 if (!dmu_tx_is_syncing(tx)) 1052 return (0); 1053 1054 /* 1055 * If there's an fs-only reservation, any blocks that might become 1056 * owned by the snapshot dataset must be accommodated by space 1057 * outside of the reservation. 1058 */ 1059 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1060 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1061 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1062 return (SET_ERROR(ENOSPC)); 1063 1064 /* 1065 * Propagate any reserved space for this snapshot to other 1066 * snapshot checks in this sync group. 1067 */ 1068 if (asize > 0) 1069 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1070 1071 return (0); 1072 } 1073 1074 typedef struct dsl_dataset_snapshot_arg { 1075 nvlist_t *ddsa_snaps; 1076 nvlist_t *ddsa_props; 1077 nvlist_t *ddsa_errors; 1078 cred_t *ddsa_cr; 1079 } dsl_dataset_snapshot_arg_t; 1080 1081 int 1082 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1083 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1084 { 1085 int error; 1086 uint64_t value; 1087 1088 ds->ds_trysnap_txg = tx->tx_txg; 1089 1090 if (!dmu_tx_is_syncing(tx)) 1091 return (0); 1092 1093 /* 1094 * We don't allow multiple snapshots of the same txg. If there 1095 * is already one, try again. 1096 */ 1097 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1098 return (SET_ERROR(EAGAIN)); 1099 1100 /* 1101 * Check for conflicting snapshot name. 1102 */ 1103 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1104 if (error == 0) 1105 return (SET_ERROR(EEXIST)); 1106 if (error != ENOENT) 1107 return (error); 1108 1109 /* 1110 * We don't allow taking snapshots of inconsistent datasets, such as 1111 * those into which we are currently receiving. However, if we are 1112 * creating this snapshot as part of a receive, this check will be 1113 * executed atomically with respect to the completion of the receive 1114 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1115 * case we ignore this, knowing it will be fixed up for us shortly in 1116 * dmu_recv_end_sync(). 1117 */ 1118 if (!recv && DS_IS_INCONSISTENT(ds)) 1119 return (SET_ERROR(EBUSY)); 1120 1121 /* 1122 * Skip the check for temporary snapshots or if we have already checked 1123 * the counts in dsl_dataset_snapshot_check. This means we really only 1124 * check the count here when we're receiving a stream. 1125 */ 1126 if (cnt != 0 && cr != NULL) { 1127 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1128 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1129 if (error != 0) 1130 return (error); 1131 } 1132 1133 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1134 if (error != 0) 1135 return (error); 1136 1137 return (0); 1138 } 1139 1140 static int 1141 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1142 { 1143 dsl_dataset_snapshot_arg_t *ddsa = arg; 1144 dsl_pool_t *dp = dmu_tx_pool(tx); 1145 nvpair_t *pair; 1146 int rv = 0; 1147 1148 /* 1149 * Pre-compute how many total new snapshots will be created for each 1150 * level in the tree and below. This is needed for validating the 1151 * snapshot limit when either taking a recursive snapshot or when 1152 * taking multiple snapshots. 1153 * 1154 * The problem is that the counts are not actually adjusted when 1155 * we are checking, only when we finally sync. For a single snapshot, 1156 * this is easy, the count will increase by 1 at each node up the tree, 1157 * but its more complicated for the recursive/multiple snapshot case. 1158 * 1159 * The dsl_fs_ss_limit_check function does recursively check the count 1160 * at each level up the tree but since it is validating each snapshot 1161 * independently we need to be sure that we are validating the complete 1162 * count for the entire set of snapshots. We do this by rolling up the 1163 * counts for each component of the name into an nvlist and then 1164 * checking each of those cases with the aggregated count. 1165 * 1166 * This approach properly handles not only the recursive snapshot 1167 * case (where we get all of those on the ddsa_snaps list) but also 1168 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1169 * validate the limit on 'a' using a count of 2). 1170 * 1171 * We validate the snapshot names in the third loop and only report 1172 * name errors once. 1173 */ 1174 if (dmu_tx_is_syncing(tx)) { 1175 nvlist_t *cnt_track = NULL; 1176 cnt_track = fnvlist_alloc(); 1177 1178 /* Rollup aggregated counts into the cnt_track list */ 1179 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1180 pair != NULL; 1181 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1182 char *pdelim; 1183 uint64_t val; 1184 char nm[MAXPATHLEN]; 1185 1186 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1187 pdelim = strchr(nm, '@'); 1188 if (pdelim == NULL) 1189 continue; 1190 *pdelim = '\0'; 1191 1192 do { 1193 if (nvlist_lookup_uint64(cnt_track, nm, 1194 &val) == 0) { 1195 /* update existing entry */ 1196 fnvlist_add_uint64(cnt_track, nm, 1197 val + 1); 1198 } else { 1199 /* add to list */ 1200 fnvlist_add_uint64(cnt_track, nm, 1); 1201 } 1202 1203 pdelim = strrchr(nm, '/'); 1204 if (pdelim != NULL) 1205 *pdelim = '\0'; 1206 } while (pdelim != NULL); 1207 } 1208 1209 /* Check aggregated counts at each level */ 1210 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1211 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1212 int error = 0; 1213 char *name; 1214 uint64_t cnt = 0; 1215 dsl_dataset_t *ds; 1216 1217 name = nvpair_name(pair); 1218 cnt = fnvpair_value_uint64(pair); 1219 ASSERT(cnt > 0); 1220 1221 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1222 if (error == 0) { 1223 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1224 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1225 ddsa->ddsa_cr); 1226 dsl_dataset_rele(ds, FTAG); 1227 } 1228 1229 if (error != 0) { 1230 if (ddsa->ddsa_errors != NULL) 1231 fnvlist_add_int32(ddsa->ddsa_errors, 1232 name, error); 1233 rv = error; 1234 /* only report one error for this check */ 1235 break; 1236 } 1237 } 1238 nvlist_free(cnt_track); 1239 } 1240 1241 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1242 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1243 int error = 0; 1244 dsl_dataset_t *ds; 1245 char *name, *atp; 1246 char dsname[MAXNAMELEN]; 1247 1248 name = nvpair_name(pair); 1249 if (strlen(name) >= MAXNAMELEN) 1250 error = SET_ERROR(ENAMETOOLONG); 1251 if (error == 0) { 1252 atp = strchr(name, '@'); 1253 if (atp == NULL) 1254 error = SET_ERROR(EINVAL); 1255 if (error == 0) 1256 (void) strlcpy(dsname, name, atp - name + 1); 1257 } 1258 if (error == 0) 1259 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1260 if (error == 0) { 1261 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1262 error = dsl_dataset_snapshot_check_impl(ds, 1263 atp + 1, tx, B_FALSE, 0, NULL); 1264 dsl_dataset_rele(ds, FTAG); 1265 } 1266 1267 if (error != 0) { 1268 if (ddsa->ddsa_errors != NULL) { 1269 fnvlist_add_int32(ddsa->ddsa_errors, 1270 name, error); 1271 } 1272 rv = error; 1273 } 1274 } 1275 1276 return (rv); 1277 } 1278 1279 void 1280 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1281 dmu_tx_t *tx) 1282 { 1283 static zil_header_t zero_zil; 1284 1285 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1286 dmu_buf_t *dbuf; 1287 dsl_dataset_phys_t *dsphys; 1288 uint64_t dsobj, crtxg; 1289 objset_t *mos = dp->dp_meta_objset; 1290 objset_t *os; 1291 1292 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1293 1294 /* 1295 * If we are on an old pool, the zil must not be active, in which 1296 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1297 */ 1298 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1299 dmu_objset_from_ds(ds, &os) != 0 || 1300 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1301 sizeof (zero_zil)) == 0); 1302 1303 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1304 1305 /* 1306 * The origin's ds_creation_txg has to be < TXG_INITIAL 1307 */ 1308 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1309 crtxg = 1; 1310 else 1311 crtxg = tx->tx_txg; 1312 1313 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1314 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1315 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1316 dmu_buf_will_dirty(dbuf, tx); 1317 dsphys = dbuf->db_data; 1318 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1319 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1320 dsphys->ds_fsid_guid = unique_create(); 1321 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1322 sizeof (dsphys->ds_guid)); 1323 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1324 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1325 dsphys->ds_next_snap_obj = ds->ds_object; 1326 dsphys->ds_num_children = 1; 1327 dsphys->ds_creation_time = gethrestime_sec(); 1328 dsphys->ds_creation_txg = crtxg; 1329 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1330 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1331 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1332 dsphys->ds_uncompressed_bytes = 1333 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1334 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1335 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1336 dmu_buf_rele(dbuf, FTAG); 1337 1338 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1339 if (ds->ds_feature_inuse[f]) 1340 dsl_dataset_activate_feature(dsobj, f, tx); 1341 } 1342 1343 ASSERT3U(ds->ds_prev != 0, ==, 1344 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1345 if (ds->ds_prev) { 1346 uint64_t next_clones_obj = 1347 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1348 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1349 ds->ds_object || 1350 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1351 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1352 ds->ds_object) { 1353 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1354 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1355 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1356 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1357 } else if (next_clones_obj != 0) { 1358 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1359 dsphys->ds_next_snap_obj, tx); 1360 VERIFY0(zap_add_int(mos, 1361 next_clones_obj, dsobj, tx)); 1362 } 1363 } 1364 1365 /* 1366 * If we have a reference-reservation on this dataset, we will 1367 * need to increase the amount of refreservation being charged 1368 * since our unique space is going to zero. 1369 */ 1370 if (ds->ds_reserved) { 1371 int64_t delta; 1372 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1373 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1374 ds->ds_reserved); 1375 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1376 delta, 0, 0, tx); 1377 } 1378 1379 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1380 dsl_dataset_phys(ds)->ds_deadlist_obj = 1381 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1382 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1383 dsl_deadlist_close(&ds->ds_deadlist); 1384 dsl_deadlist_open(&ds->ds_deadlist, mos, 1385 dsl_dataset_phys(ds)->ds_deadlist_obj); 1386 dsl_deadlist_add_key(&ds->ds_deadlist, 1387 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1388 1389 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1390 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1391 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1392 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1393 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1394 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1395 1396 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1397 snapname, 8, 1, &dsobj, tx)); 1398 1399 if (ds->ds_prev) 1400 dsl_dataset_rele(ds->ds_prev, ds); 1401 VERIFY0(dsl_dataset_hold_obj(dp, 1402 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1403 1404 dsl_scan_ds_snapshotted(ds, tx); 1405 1406 dsl_dir_snap_cmtime_update(ds->ds_dir); 1407 1408 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1409 } 1410 1411 static void 1412 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1413 { 1414 dsl_dataset_snapshot_arg_t *ddsa = arg; 1415 dsl_pool_t *dp = dmu_tx_pool(tx); 1416 nvpair_t *pair; 1417 1418 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1419 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1420 dsl_dataset_t *ds; 1421 char *name, *atp; 1422 char dsname[MAXNAMELEN]; 1423 1424 name = nvpair_name(pair); 1425 atp = strchr(name, '@'); 1426 (void) strlcpy(dsname, name, atp - name + 1); 1427 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1428 1429 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1430 if (ddsa->ddsa_props != NULL) { 1431 dsl_props_set_sync_impl(ds->ds_prev, 1432 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1433 } 1434 dsl_dataset_rele(ds, FTAG); 1435 } 1436 } 1437 1438 /* 1439 * The snapshots must all be in the same pool. 1440 * All-or-nothing: if there are any failures, nothing will be modified. 1441 */ 1442 int 1443 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1444 { 1445 dsl_dataset_snapshot_arg_t ddsa; 1446 nvpair_t *pair; 1447 boolean_t needsuspend; 1448 int error; 1449 spa_t *spa; 1450 char *firstname; 1451 nvlist_t *suspended = NULL; 1452 1453 pair = nvlist_next_nvpair(snaps, NULL); 1454 if (pair == NULL) 1455 return (0); 1456 firstname = nvpair_name(pair); 1457 1458 error = spa_open(firstname, &spa, FTAG); 1459 if (error != 0) 1460 return (error); 1461 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1462 spa_close(spa, FTAG); 1463 1464 if (needsuspend) { 1465 suspended = fnvlist_alloc(); 1466 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1467 pair = nvlist_next_nvpair(snaps, pair)) { 1468 char fsname[MAXNAMELEN]; 1469 char *snapname = nvpair_name(pair); 1470 char *atp; 1471 void *cookie; 1472 1473 atp = strchr(snapname, '@'); 1474 if (atp == NULL) { 1475 error = SET_ERROR(EINVAL); 1476 break; 1477 } 1478 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1479 1480 error = zil_suspend(fsname, &cookie); 1481 if (error != 0) 1482 break; 1483 fnvlist_add_uint64(suspended, fsname, 1484 (uintptr_t)cookie); 1485 } 1486 } 1487 1488 ddsa.ddsa_snaps = snaps; 1489 ddsa.ddsa_props = props; 1490 ddsa.ddsa_errors = errors; 1491 ddsa.ddsa_cr = CRED(); 1492 1493 if (error == 0) { 1494 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1495 dsl_dataset_snapshot_sync, &ddsa, 1496 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1497 } 1498 1499 if (suspended != NULL) { 1500 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1501 pair = nvlist_next_nvpair(suspended, pair)) { 1502 zil_resume((void *)(uintptr_t) 1503 fnvpair_value_uint64(pair)); 1504 } 1505 fnvlist_free(suspended); 1506 } 1507 1508 return (error); 1509 } 1510 1511 typedef struct dsl_dataset_snapshot_tmp_arg { 1512 const char *ddsta_fsname; 1513 const char *ddsta_snapname; 1514 minor_t ddsta_cleanup_minor; 1515 const char *ddsta_htag; 1516 } dsl_dataset_snapshot_tmp_arg_t; 1517 1518 static int 1519 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1520 { 1521 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1522 dsl_pool_t *dp = dmu_tx_pool(tx); 1523 dsl_dataset_t *ds; 1524 int error; 1525 1526 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1527 if (error != 0) 1528 return (error); 1529 1530 /* NULL cred means no limit check for tmp snapshot */ 1531 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1532 tx, B_FALSE, 0, NULL); 1533 if (error != 0) { 1534 dsl_dataset_rele(ds, FTAG); 1535 return (error); 1536 } 1537 1538 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1539 dsl_dataset_rele(ds, FTAG); 1540 return (SET_ERROR(ENOTSUP)); 1541 } 1542 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1543 B_TRUE, tx); 1544 if (error != 0) { 1545 dsl_dataset_rele(ds, FTAG); 1546 return (error); 1547 } 1548 1549 dsl_dataset_rele(ds, FTAG); 1550 return (0); 1551 } 1552 1553 static void 1554 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1555 { 1556 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1557 dsl_pool_t *dp = dmu_tx_pool(tx); 1558 dsl_dataset_t *ds; 1559 1560 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1561 1562 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1563 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1564 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1565 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1566 1567 dsl_dataset_rele(ds, FTAG); 1568 } 1569 1570 int 1571 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1572 minor_t cleanup_minor, const char *htag) 1573 { 1574 dsl_dataset_snapshot_tmp_arg_t ddsta; 1575 int error; 1576 spa_t *spa; 1577 boolean_t needsuspend; 1578 void *cookie; 1579 1580 ddsta.ddsta_fsname = fsname; 1581 ddsta.ddsta_snapname = snapname; 1582 ddsta.ddsta_cleanup_minor = cleanup_minor; 1583 ddsta.ddsta_htag = htag; 1584 1585 error = spa_open(fsname, &spa, FTAG); 1586 if (error != 0) 1587 return (error); 1588 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1589 spa_close(spa, FTAG); 1590 1591 if (needsuspend) { 1592 error = zil_suspend(fsname, &cookie); 1593 if (error != 0) 1594 return (error); 1595 } 1596 1597 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1598 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1599 1600 if (needsuspend) 1601 zil_resume(cookie); 1602 return (error); 1603 } 1604 1605 1606 void 1607 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1608 { 1609 ASSERT(dmu_tx_is_syncing(tx)); 1610 ASSERT(ds->ds_objset != NULL); 1611 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1612 1613 /* 1614 * in case we had to change ds_fsid_guid when we opened it, 1615 * sync it out now. 1616 */ 1617 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1618 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1619 1620 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1621 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1622 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1623 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1624 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1625 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1626 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1627 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1628 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1629 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1630 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1631 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1632 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1633 } 1634 1635 dmu_objset_sync(ds->ds_objset, zio, tx); 1636 1637 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1638 if (ds->ds_feature_activation_needed[f]) { 1639 if (ds->ds_feature_inuse[f]) 1640 continue; 1641 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1642 ds->ds_feature_inuse[f] = B_TRUE; 1643 } 1644 } 1645 } 1646 1647 static void 1648 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1649 { 1650 uint64_t count = 0; 1651 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1652 zap_cursor_t zc; 1653 zap_attribute_t za; 1654 nvlist_t *propval = fnvlist_alloc(); 1655 nvlist_t *val = fnvlist_alloc(); 1656 1657 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1658 1659 /* 1660 * There may be missing entries in ds_next_clones_obj 1661 * due to a bug in a previous version of the code. 1662 * Only trust it if it has the right number of entries. 1663 */ 1664 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1665 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1666 &count)); 1667 } 1668 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1669 goto fail; 1670 for (zap_cursor_init(&zc, mos, 1671 dsl_dataset_phys(ds)->ds_next_clones_obj); 1672 zap_cursor_retrieve(&zc, &za) == 0; 1673 zap_cursor_advance(&zc)) { 1674 dsl_dataset_t *clone; 1675 char buf[ZFS_MAXNAMELEN]; 1676 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1677 za.za_first_integer, FTAG, &clone)); 1678 dsl_dir_name(clone->ds_dir, buf); 1679 fnvlist_add_boolean(val, buf); 1680 dsl_dataset_rele(clone, FTAG); 1681 } 1682 zap_cursor_fini(&zc); 1683 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1684 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1685 fail: 1686 nvlist_free(val); 1687 nvlist_free(propval); 1688 } 1689 1690 static void 1691 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1692 { 1693 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1694 1695 if (dsl_dataset_has_resume_receive_state(ds)) { 1696 char *str; 1697 void *packed; 1698 uint8_t *compressed; 1699 uint64_t val; 1700 nvlist_t *token_nv = fnvlist_alloc(); 1701 size_t packed_size, compressed_size; 1702 1703 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1704 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1705 fnvlist_add_uint64(token_nv, "fromguid", val); 1706 } 1707 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1708 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1709 fnvlist_add_uint64(token_nv, "object", val); 1710 } 1711 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1712 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1713 fnvlist_add_uint64(token_nv, "offset", val); 1714 } 1715 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1716 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1717 fnvlist_add_uint64(token_nv, "bytes", val); 1718 } 1719 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1720 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1721 fnvlist_add_uint64(token_nv, "toguid", val); 1722 } 1723 char buf[256]; 1724 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1725 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1726 fnvlist_add_string(token_nv, "toname", buf); 1727 } 1728 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1729 DS_FIELD_RESUME_EMBEDOK) == 0) { 1730 fnvlist_add_boolean(token_nv, "embedok"); 1731 } 1732 packed = fnvlist_pack(token_nv, &packed_size); 1733 fnvlist_free(token_nv); 1734 compressed = kmem_alloc(packed_size, KM_SLEEP); 1735 1736 compressed_size = gzip_compress(packed, compressed, 1737 packed_size, packed_size, 6); 1738 1739 zio_cksum_t cksum; 1740 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1741 1742 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1743 for (int i = 0; i < compressed_size; i++) { 1744 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1745 } 1746 str[compressed_size * 2] = '\0'; 1747 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1748 ZFS_SEND_RESUME_TOKEN_VERSION, 1749 (longlong_t)cksum.zc_word[0], 1750 (longlong_t)packed_size, str); 1751 dsl_prop_nvlist_add_string(nv, 1752 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1753 kmem_free(packed, packed_size); 1754 kmem_free(str, compressed_size * 2 + 1); 1755 kmem_free(compressed, packed_size); 1756 strfree(propval); 1757 } 1758 } 1759 1760 void 1761 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1762 { 1763 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1764 uint64_t refd, avail, uobjs, aobjs, ratio; 1765 1766 ASSERT(dsl_pool_config_held(dp)); 1767 1768 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1769 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1770 dsl_dataset_phys(ds)->ds_compressed_bytes); 1771 1772 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1773 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1774 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1775 1776 if (ds->ds_is_snapshot) { 1777 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1778 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1779 dsl_dataset_phys(ds)->ds_unique_bytes); 1780 get_clones_stat(ds, nv); 1781 } else { 1782 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1783 char buf[MAXNAMELEN]; 1784 dsl_dataset_name(ds->ds_prev, buf); 1785 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1786 } 1787 1788 dsl_dir_stats(ds->ds_dir, nv); 1789 } 1790 1791 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1792 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1793 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1794 1795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1796 dsl_dataset_phys(ds)->ds_creation_time); 1797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1798 dsl_dataset_phys(ds)->ds_creation_txg); 1799 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1800 ds->ds_quota); 1801 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1802 ds->ds_reserved); 1803 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1804 dsl_dataset_phys(ds)->ds_guid); 1805 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1806 dsl_dataset_phys(ds)->ds_unique_bytes); 1807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1808 ds->ds_object); 1809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1810 ds->ds_userrefs); 1811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1812 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1813 1814 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1815 uint64_t written, comp, uncomp; 1816 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1817 dsl_dataset_t *prev; 1818 1819 int err = dsl_dataset_hold_obj(dp, 1820 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1821 if (err == 0) { 1822 err = dsl_dataset_space_written(prev, ds, &written, 1823 &comp, &uncomp); 1824 dsl_dataset_rele(prev, FTAG); 1825 if (err == 0) { 1826 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1827 written); 1828 } 1829 } 1830 } 1831 1832 if (!dsl_dataset_is_snapshot(ds)) { 1833 /* 1834 * A failed "newfs" (e.g. full) resumable receive leaves 1835 * the stats set on this dataset. Check here for the prop. 1836 */ 1837 get_receive_resume_stats(ds, nv); 1838 1839 /* 1840 * A failed incremental resumable receive leaves the 1841 * stats set on our child named "%recv". Check the child 1842 * for the prop. 1843 */ 1844 char recvname[ZFS_MAXNAMELEN]; 1845 dsl_dataset_t *recv_ds; 1846 dsl_dataset_name(ds, recvname); 1847 (void) strcat(recvname, "/"); 1848 (void) strcat(recvname, recv_clone_name); 1849 if (dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1850 get_receive_resume_stats(recv_ds, nv); 1851 dsl_dataset_rele(recv_ds, FTAG); 1852 } 1853 } 1854 } 1855 1856 void 1857 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1858 { 1859 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1860 ASSERT(dsl_pool_config_held(dp)); 1861 1862 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1863 stat->dds_inconsistent = 1864 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1865 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1866 stat->dds_origin[0] = '\0'; 1867 if (ds->ds_is_snapshot) { 1868 stat->dds_is_snapshot = B_TRUE; 1869 stat->dds_num_clones = 1870 dsl_dataset_phys(ds)->ds_num_children - 1; 1871 } else { 1872 stat->dds_is_snapshot = B_FALSE; 1873 stat->dds_num_clones = 0; 1874 1875 if (dsl_dir_is_clone(ds->ds_dir)) { 1876 dsl_dataset_t *ods; 1877 1878 VERIFY0(dsl_dataset_hold_obj(dp, 1879 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1880 FTAG, &ods)); 1881 dsl_dataset_name(ods, stat->dds_origin); 1882 dsl_dataset_rele(ods, FTAG); 1883 } 1884 } 1885 } 1886 1887 uint64_t 1888 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1889 { 1890 return (ds->ds_fsid_guid); 1891 } 1892 1893 void 1894 dsl_dataset_space(dsl_dataset_t *ds, 1895 uint64_t *refdbytesp, uint64_t *availbytesp, 1896 uint64_t *usedobjsp, uint64_t *availobjsp) 1897 { 1898 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1899 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1900 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1901 *availbytesp += 1902 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1903 if (ds->ds_quota != 0) { 1904 /* 1905 * Adjust available bytes according to refquota 1906 */ 1907 if (*refdbytesp < ds->ds_quota) 1908 *availbytesp = MIN(*availbytesp, 1909 ds->ds_quota - *refdbytesp); 1910 else 1911 *availbytesp = 0; 1912 } 1913 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1914 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1915 } 1916 1917 boolean_t 1918 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1919 { 1920 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1921 1922 ASSERT(dsl_pool_config_held(dp)); 1923 if (snap == NULL) 1924 return (B_FALSE); 1925 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1926 dsl_dataset_phys(snap)->ds_creation_txg) { 1927 objset_t *os, *os_snap; 1928 /* 1929 * It may be that only the ZIL differs, because it was 1930 * reset in the head. Don't count that as being 1931 * modified. 1932 */ 1933 if (dmu_objset_from_ds(ds, &os) != 0) 1934 return (B_TRUE); 1935 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1936 return (B_TRUE); 1937 return (bcmp(&os->os_phys->os_meta_dnode, 1938 &os_snap->os_phys->os_meta_dnode, 1939 sizeof (os->os_phys->os_meta_dnode)) != 0); 1940 } 1941 return (B_FALSE); 1942 } 1943 1944 typedef struct dsl_dataset_rename_snapshot_arg { 1945 const char *ddrsa_fsname; 1946 const char *ddrsa_oldsnapname; 1947 const char *ddrsa_newsnapname; 1948 boolean_t ddrsa_recursive; 1949 dmu_tx_t *ddrsa_tx; 1950 } dsl_dataset_rename_snapshot_arg_t; 1951 1952 /* ARGSUSED */ 1953 static int 1954 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1955 dsl_dataset_t *hds, void *arg) 1956 { 1957 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1958 int error; 1959 uint64_t val; 1960 1961 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1962 if (error != 0) { 1963 /* ignore nonexistent snapshots */ 1964 return (error == ENOENT ? 0 : error); 1965 } 1966 1967 /* new name should not exist */ 1968 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1969 if (error == 0) 1970 error = SET_ERROR(EEXIST); 1971 else if (error == ENOENT) 1972 error = 0; 1973 1974 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1975 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1976 strlen(ddrsa->ddrsa_newsnapname) >= MAXNAMELEN) 1977 error = SET_ERROR(ENAMETOOLONG); 1978 1979 return (error); 1980 } 1981 1982 static int 1983 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1984 { 1985 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1986 dsl_pool_t *dp = dmu_tx_pool(tx); 1987 dsl_dataset_t *hds; 1988 int error; 1989 1990 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1991 if (error != 0) 1992 return (error); 1993 1994 if (ddrsa->ddrsa_recursive) { 1995 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 1996 dsl_dataset_rename_snapshot_check_impl, ddrsa, 1997 DS_FIND_CHILDREN); 1998 } else { 1999 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2000 } 2001 dsl_dataset_rele(hds, FTAG); 2002 return (error); 2003 } 2004 2005 static int 2006 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2007 dsl_dataset_t *hds, void *arg) 2008 { 2009 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2010 dsl_dataset_t *ds; 2011 uint64_t val; 2012 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2013 int error; 2014 2015 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2016 ASSERT(error == 0 || error == ENOENT); 2017 if (error == ENOENT) { 2018 /* ignore nonexistent snapshots */ 2019 return (0); 2020 } 2021 2022 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2023 2024 /* log before we change the name */ 2025 spa_history_log_internal_ds(ds, "rename", tx, 2026 "-> @%s", ddrsa->ddrsa_newsnapname); 2027 2028 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2029 B_FALSE)); 2030 mutex_enter(&ds->ds_lock); 2031 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2032 mutex_exit(&ds->ds_lock); 2033 VERIFY0(zap_add(dp->dp_meta_objset, 2034 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2035 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2036 2037 dsl_dataset_rele(ds, FTAG); 2038 return (0); 2039 } 2040 2041 static void 2042 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2043 { 2044 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2045 dsl_pool_t *dp = dmu_tx_pool(tx); 2046 dsl_dataset_t *hds; 2047 2048 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2049 ddrsa->ddrsa_tx = tx; 2050 if (ddrsa->ddrsa_recursive) { 2051 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2052 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2053 DS_FIND_CHILDREN)); 2054 } else { 2055 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2056 } 2057 dsl_dataset_rele(hds, FTAG); 2058 } 2059 2060 int 2061 dsl_dataset_rename_snapshot(const char *fsname, 2062 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2063 { 2064 dsl_dataset_rename_snapshot_arg_t ddrsa; 2065 2066 ddrsa.ddrsa_fsname = fsname; 2067 ddrsa.ddrsa_oldsnapname = oldsnapname; 2068 ddrsa.ddrsa_newsnapname = newsnapname; 2069 ddrsa.ddrsa_recursive = recursive; 2070 2071 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2072 dsl_dataset_rename_snapshot_sync, &ddrsa, 2073 1, ZFS_SPACE_CHECK_RESERVED)); 2074 } 2075 2076 /* 2077 * If we're doing an ownership handoff, we need to make sure that there is 2078 * only one long hold on the dataset. We're not allowed to change anything here 2079 * so we don't permanently release the long hold or regular hold here. We want 2080 * to do this only when syncing to avoid the dataset unexpectedly going away 2081 * when we release the long hold. 2082 */ 2083 static int 2084 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2085 { 2086 boolean_t held; 2087 2088 if (!dmu_tx_is_syncing(tx)) 2089 return (0); 2090 2091 if (owner != NULL) { 2092 VERIFY3P(ds->ds_owner, ==, owner); 2093 dsl_dataset_long_rele(ds, owner); 2094 } 2095 2096 held = dsl_dataset_long_held(ds); 2097 2098 if (owner != NULL) 2099 dsl_dataset_long_hold(ds, owner); 2100 2101 if (held) 2102 return (SET_ERROR(EBUSY)); 2103 2104 return (0); 2105 } 2106 2107 typedef struct dsl_dataset_rollback_arg { 2108 const char *ddra_fsname; 2109 void *ddra_owner; 2110 nvlist_t *ddra_result; 2111 } dsl_dataset_rollback_arg_t; 2112 2113 static int 2114 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2115 { 2116 dsl_dataset_rollback_arg_t *ddra = arg; 2117 dsl_pool_t *dp = dmu_tx_pool(tx); 2118 dsl_dataset_t *ds; 2119 int64_t unused_refres_delta; 2120 int error; 2121 2122 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2123 if (error != 0) 2124 return (error); 2125 2126 /* must not be a snapshot */ 2127 if (ds->ds_is_snapshot) { 2128 dsl_dataset_rele(ds, FTAG); 2129 return (SET_ERROR(EINVAL)); 2130 } 2131 2132 /* must have a most recent snapshot */ 2133 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2134 dsl_dataset_rele(ds, FTAG); 2135 return (SET_ERROR(EINVAL)); 2136 } 2137 2138 /* must not have any bookmarks after the most recent snapshot */ 2139 nvlist_t *proprequest = fnvlist_alloc(); 2140 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2141 nvlist_t *bookmarks = fnvlist_alloc(); 2142 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2143 fnvlist_free(proprequest); 2144 if (error != 0) 2145 return (error); 2146 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2147 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2148 nvlist_t *valuenv = 2149 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2150 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2151 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2152 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2153 fnvlist_free(bookmarks); 2154 dsl_dataset_rele(ds, FTAG); 2155 return (SET_ERROR(EEXIST)); 2156 } 2157 } 2158 fnvlist_free(bookmarks); 2159 2160 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2161 if (error != 0) { 2162 dsl_dataset_rele(ds, FTAG); 2163 return (error); 2164 } 2165 2166 /* 2167 * Check if the snap we are rolling back to uses more than 2168 * the refquota. 2169 */ 2170 if (ds->ds_quota != 0 && 2171 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2172 dsl_dataset_rele(ds, FTAG); 2173 return (SET_ERROR(EDQUOT)); 2174 } 2175 2176 /* 2177 * When we do the clone swap, we will temporarily use more space 2178 * due to the refreservation (the head will no longer have any 2179 * unique space, so the entire amount of the refreservation will need 2180 * to be free). We will immediately destroy the clone, freeing 2181 * this space, but the freeing happens over many txg's. 2182 */ 2183 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2184 dsl_dataset_phys(ds)->ds_unique_bytes); 2185 2186 if (unused_refres_delta > 0 && 2187 unused_refres_delta > 2188 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2189 dsl_dataset_rele(ds, FTAG); 2190 return (SET_ERROR(ENOSPC)); 2191 } 2192 2193 dsl_dataset_rele(ds, FTAG); 2194 return (0); 2195 } 2196 2197 static void 2198 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2199 { 2200 dsl_dataset_rollback_arg_t *ddra = arg; 2201 dsl_pool_t *dp = dmu_tx_pool(tx); 2202 dsl_dataset_t *ds, *clone; 2203 uint64_t cloneobj; 2204 char namebuf[ZFS_MAXNAMELEN]; 2205 2206 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2207 2208 dsl_dataset_name(ds->ds_prev, namebuf); 2209 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2210 2211 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2212 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2213 2214 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2215 2216 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2217 dsl_dataset_zero_zil(ds, tx); 2218 2219 dsl_destroy_head_sync_impl(clone, tx); 2220 2221 dsl_dataset_rele(clone, FTAG); 2222 dsl_dataset_rele(ds, FTAG); 2223 } 2224 2225 /* 2226 * Rolls back the given filesystem or volume to the most recent snapshot. 2227 * The name of the most recent snapshot will be returned under key "target" 2228 * in the result nvlist. 2229 * 2230 * If owner != NULL: 2231 * - The existing dataset MUST be owned by the specified owner at entry 2232 * - Upon return, dataset will still be held by the same owner, whether we 2233 * succeed or not. 2234 * 2235 * This mode is required any time the existing filesystem is mounted. See 2236 * notes above zfs_suspend_fs() for further details. 2237 */ 2238 int 2239 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2240 { 2241 dsl_dataset_rollback_arg_t ddra; 2242 2243 ddra.ddra_fsname = fsname; 2244 ddra.ddra_owner = owner; 2245 ddra.ddra_result = result; 2246 2247 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2248 dsl_dataset_rollback_sync, &ddra, 2249 1, ZFS_SPACE_CHECK_RESERVED)); 2250 } 2251 2252 struct promotenode { 2253 list_node_t link; 2254 dsl_dataset_t *ds; 2255 }; 2256 2257 typedef struct dsl_dataset_promote_arg { 2258 const char *ddpa_clonename; 2259 dsl_dataset_t *ddpa_clone; 2260 list_t shared_snaps, origin_snaps, clone_snaps; 2261 dsl_dataset_t *origin_origin; /* origin of the origin */ 2262 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2263 char *err_ds; 2264 cred_t *cr; 2265 } dsl_dataset_promote_arg_t; 2266 2267 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2268 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2269 void *tag); 2270 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2271 2272 static int 2273 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2274 { 2275 dsl_dataset_promote_arg_t *ddpa = arg; 2276 dsl_pool_t *dp = dmu_tx_pool(tx); 2277 dsl_dataset_t *hds; 2278 struct promotenode *snap; 2279 dsl_dataset_t *origin_ds; 2280 int err; 2281 uint64_t unused; 2282 uint64_t ss_mv_cnt; 2283 size_t max_snap_len; 2284 2285 err = promote_hold(ddpa, dp, FTAG); 2286 if (err != 0) 2287 return (err); 2288 2289 hds = ddpa->ddpa_clone; 2290 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2291 2292 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2293 promote_rele(ddpa, FTAG); 2294 return (SET_ERROR(EXDEV)); 2295 } 2296 2297 /* 2298 * Compute and check the amount of space to transfer. Since this is 2299 * so expensive, don't do the preliminary check. 2300 */ 2301 if (!dmu_tx_is_syncing(tx)) { 2302 promote_rele(ddpa, FTAG); 2303 return (0); 2304 } 2305 2306 snap = list_head(&ddpa->shared_snaps); 2307 origin_ds = snap->ds; 2308 2309 /* compute origin's new unique space */ 2310 snap = list_tail(&ddpa->clone_snaps); 2311 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2312 origin_ds->ds_object); 2313 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2314 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2315 &ddpa->unique, &unused, &unused); 2316 2317 /* 2318 * Walk the snapshots that we are moving 2319 * 2320 * Compute space to transfer. Consider the incremental changes 2321 * to used by each snapshot: 2322 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2323 * So each snapshot gave birth to: 2324 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2325 * So a sequence would look like: 2326 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2327 * Which simplifies to: 2328 * uN + kN + kN-1 + ... + k1 + k0 2329 * Note however, if we stop before we reach the ORIGIN we get: 2330 * uN + kN + kN-1 + ... + kM - uM-1 2331 */ 2332 ss_mv_cnt = 0; 2333 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2334 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2335 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2336 for (snap = list_head(&ddpa->shared_snaps); snap; 2337 snap = list_next(&ddpa->shared_snaps, snap)) { 2338 uint64_t val, dlused, dlcomp, dluncomp; 2339 dsl_dataset_t *ds = snap->ds; 2340 2341 ss_mv_cnt++; 2342 2343 /* 2344 * If there are long holds, we won't be able to evict 2345 * the objset. 2346 */ 2347 if (dsl_dataset_long_held(ds)) { 2348 err = SET_ERROR(EBUSY); 2349 goto out; 2350 } 2351 2352 /* Check that the snapshot name does not conflict */ 2353 VERIFY0(dsl_dataset_get_snapname(ds)); 2354 if (strlen(ds->ds_snapname) >= max_snap_len) { 2355 err = SET_ERROR(ENAMETOOLONG); 2356 goto out; 2357 } 2358 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2359 if (err == 0) { 2360 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2361 err = SET_ERROR(EEXIST); 2362 goto out; 2363 } 2364 if (err != ENOENT) 2365 goto out; 2366 2367 /* The very first snapshot does not have a deadlist */ 2368 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2369 continue; 2370 2371 dsl_deadlist_space(&ds->ds_deadlist, 2372 &dlused, &dlcomp, &dluncomp); 2373 ddpa->used += dlused; 2374 ddpa->comp += dlcomp; 2375 ddpa->uncomp += dluncomp; 2376 } 2377 2378 /* 2379 * If we are a clone of a clone then we never reached ORIGIN, 2380 * so we need to subtract out the clone origin's used space. 2381 */ 2382 if (ddpa->origin_origin) { 2383 ddpa->used -= 2384 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2385 ddpa->comp -= 2386 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2387 ddpa->uncomp -= 2388 dsl_dataset_phys(ddpa->origin_origin)-> 2389 ds_uncompressed_bytes; 2390 } 2391 2392 /* Check that there is enough space and limit headroom here */ 2393 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2394 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2395 if (err != 0) 2396 goto out; 2397 2398 /* 2399 * Compute the amounts of space that will be used by snapshots 2400 * after the promotion (for both origin and clone). For each, 2401 * it is the amount of space that will be on all of their 2402 * deadlists (that was not born before their new origin). 2403 */ 2404 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2405 uint64_t space; 2406 2407 /* 2408 * Note, typically this will not be a clone of a clone, 2409 * so dd_origin_txg will be < TXG_INITIAL, so 2410 * these snaplist_space() -> dsl_deadlist_space_range() 2411 * calls will be fast because they do not have to 2412 * iterate over all bps. 2413 */ 2414 snap = list_head(&ddpa->origin_snaps); 2415 err = snaplist_space(&ddpa->shared_snaps, 2416 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2417 if (err != 0) 2418 goto out; 2419 2420 err = snaplist_space(&ddpa->clone_snaps, 2421 snap->ds->ds_dir->dd_origin_txg, &space); 2422 if (err != 0) 2423 goto out; 2424 ddpa->cloneusedsnap += space; 2425 } 2426 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2427 DD_FLAG_USED_BREAKDOWN) { 2428 err = snaplist_space(&ddpa->origin_snaps, 2429 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2430 &ddpa->originusedsnap); 2431 if (err != 0) 2432 goto out; 2433 } 2434 2435 out: 2436 promote_rele(ddpa, FTAG); 2437 return (err); 2438 } 2439 2440 static void 2441 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2442 { 2443 dsl_dataset_promote_arg_t *ddpa = arg; 2444 dsl_pool_t *dp = dmu_tx_pool(tx); 2445 dsl_dataset_t *hds; 2446 struct promotenode *snap; 2447 dsl_dataset_t *origin_ds; 2448 dsl_dataset_t *origin_head; 2449 dsl_dir_t *dd; 2450 dsl_dir_t *odd = NULL; 2451 uint64_t oldnext_obj; 2452 int64_t delta; 2453 2454 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2455 hds = ddpa->ddpa_clone; 2456 2457 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2458 2459 snap = list_head(&ddpa->shared_snaps); 2460 origin_ds = snap->ds; 2461 dd = hds->ds_dir; 2462 2463 snap = list_head(&ddpa->origin_snaps); 2464 origin_head = snap->ds; 2465 2466 /* 2467 * We need to explicitly open odd, since origin_ds's dd will be 2468 * changing. 2469 */ 2470 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2471 NULL, FTAG, &odd)); 2472 2473 /* change origin's next snap */ 2474 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2475 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2476 snap = list_tail(&ddpa->clone_snaps); 2477 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2478 origin_ds->ds_object); 2479 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2480 2481 /* change the origin's next clone */ 2482 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2483 dsl_dataset_remove_from_next_clones(origin_ds, 2484 snap->ds->ds_object, tx); 2485 VERIFY0(zap_add_int(dp->dp_meta_objset, 2486 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2487 oldnext_obj, tx)); 2488 } 2489 2490 /* change origin */ 2491 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2492 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2493 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2494 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2495 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2496 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2497 origin_head->ds_dir->dd_origin_txg = 2498 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2499 2500 /* change dd_clone entries */ 2501 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2502 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2503 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2504 VERIFY0(zap_add_int(dp->dp_meta_objset, 2505 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2506 hds->ds_object, tx)); 2507 2508 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2509 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2510 origin_head->ds_object, tx)); 2511 if (dsl_dir_phys(dd)->dd_clones == 0) { 2512 dsl_dir_phys(dd)->dd_clones = 2513 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2514 DMU_OT_NONE, 0, tx); 2515 } 2516 VERIFY0(zap_add_int(dp->dp_meta_objset, 2517 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2518 } 2519 2520 /* move snapshots to this dir */ 2521 for (snap = list_head(&ddpa->shared_snaps); snap; 2522 snap = list_next(&ddpa->shared_snaps, snap)) { 2523 dsl_dataset_t *ds = snap->ds; 2524 2525 /* 2526 * Property callbacks are registered to a particular 2527 * dsl_dir. Since ours is changing, evict the objset 2528 * so that they will be unregistered from the old dsl_dir. 2529 */ 2530 if (ds->ds_objset) { 2531 dmu_objset_evict(ds->ds_objset); 2532 ds->ds_objset = NULL; 2533 } 2534 2535 /* move snap name entry */ 2536 VERIFY0(dsl_dataset_get_snapname(ds)); 2537 VERIFY0(dsl_dataset_snap_remove(origin_head, 2538 ds->ds_snapname, tx, B_TRUE)); 2539 VERIFY0(zap_add(dp->dp_meta_objset, 2540 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2541 8, 1, &ds->ds_object, tx)); 2542 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2543 DD_FIELD_SNAPSHOT_COUNT, tx); 2544 2545 /* change containing dsl_dir */ 2546 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2547 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2548 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2549 ASSERT3P(ds->ds_dir, ==, odd); 2550 dsl_dir_rele(ds->ds_dir, ds); 2551 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2552 NULL, ds, &ds->ds_dir)); 2553 2554 /* move any clone references */ 2555 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2556 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2557 zap_cursor_t zc; 2558 zap_attribute_t za; 2559 2560 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2561 dsl_dataset_phys(ds)->ds_next_clones_obj); 2562 zap_cursor_retrieve(&zc, &za) == 0; 2563 zap_cursor_advance(&zc)) { 2564 dsl_dataset_t *cnds; 2565 uint64_t o; 2566 2567 if (za.za_first_integer == oldnext_obj) { 2568 /* 2569 * We've already moved the 2570 * origin's reference. 2571 */ 2572 continue; 2573 } 2574 2575 VERIFY0(dsl_dataset_hold_obj(dp, 2576 za.za_first_integer, FTAG, &cnds)); 2577 o = dsl_dir_phys(cnds->ds_dir)-> 2578 dd_head_dataset_obj; 2579 2580 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2581 dsl_dir_phys(odd)->dd_clones, o, tx)); 2582 VERIFY0(zap_add_int(dp->dp_meta_objset, 2583 dsl_dir_phys(dd)->dd_clones, o, tx)); 2584 dsl_dataset_rele(cnds, FTAG); 2585 } 2586 zap_cursor_fini(&zc); 2587 } 2588 2589 ASSERT(!dsl_prop_hascb(ds)); 2590 } 2591 2592 /* 2593 * Change space accounting. 2594 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2595 * both be valid, or both be 0 (resulting in delta == 0). This 2596 * is true for each of {clone,origin} independently. 2597 */ 2598 2599 delta = ddpa->cloneusedsnap - 2600 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2601 ASSERT3S(delta, >=, 0); 2602 ASSERT3U(ddpa->used, >=, delta); 2603 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2604 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2605 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2606 2607 delta = ddpa->originusedsnap - 2608 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2609 ASSERT3S(delta, <=, 0); 2610 ASSERT3U(ddpa->used, >=, -delta); 2611 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2612 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2613 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2614 2615 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2616 2617 /* log history record */ 2618 spa_history_log_internal_ds(hds, "promote", tx, ""); 2619 2620 dsl_dir_rele(odd, FTAG); 2621 promote_rele(ddpa, FTAG); 2622 } 2623 2624 /* 2625 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2626 * (exclusive) and last_obj (inclusive). The list will be in reverse 2627 * order (last_obj will be the list_head()). If first_obj == 0, do all 2628 * snapshots back to this dataset's origin. 2629 */ 2630 static int 2631 snaplist_make(dsl_pool_t *dp, 2632 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2633 { 2634 uint64_t obj = last_obj; 2635 2636 list_create(l, sizeof (struct promotenode), 2637 offsetof(struct promotenode, link)); 2638 2639 while (obj != first_obj) { 2640 dsl_dataset_t *ds; 2641 struct promotenode *snap; 2642 int err; 2643 2644 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2645 ASSERT(err != ENOENT); 2646 if (err != 0) 2647 return (err); 2648 2649 if (first_obj == 0) 2650 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2651 2652 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2653 snap->ds = ds; 2654 list_insert_tail(l, snap); 2655 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2656 } 2657 2658 return (0); 2659 } 2660 2661 static int 2662 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2663 { 2664 struct promotenode *snap; 2665 2666 *spacep = 0; 2667 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2668 uint64_t used, comp, uncomp; 2669 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2670 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2671 *spacep += used; 2672 } 2673 return (0); 2674 } 2675 2676 static void 2677 snaplist_destroy(list_t *l, void *tag) 2678 { 2679 struct promotenode *snap; 2680 2681 if (l == NULL || !list_link_active(&l->list_head)) 2682 return; 2683 2684 while ((snap = list_tail(l)) != NULL) { 2685 list_remove(l, snap); 2686 dsl_dataset_rele(snap->ds, tag); 2687 kmem_free(snap, sizeof (*snap)); 2688 } 2689 list_destroy(l); 2690 } 2691 2692 static int 2693 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2694 { 2695 int error; 2696 dsl_dir_t *dd; 2697 struct promotenode *snap; 2698 2699 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2700 &ddpa->ddpa_clone); 2701 if (error != 0) 2702 return (error); 2703 dd = ddpa->ddpa_clone->ds_dir; 2704 2705 if (ddpa->ddpa_clone->ds_is_snapshot || 2706 !dsl_dir_is_clone(dd)) { 2707 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2708 return (SET_ERROR(EINVAL)); 2709 } 2710 2711 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2712 &ddpa->shared_snaps, tag); 2713 if (error != 0) 2714 goto out; 2715 2716 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2717 &ddpa->clone_snaps, tag); 2718 if (error != 0) 2719 goto out; 2720 2721 snap = list_head(&ddpa->shared_snaps); 2722 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2723 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2724 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2725 &ddpa->origin_snaps, tag); 2726 if (error != 0) 2727 goto out; 2728 2729 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2730 error = dsl_dataset_hold_obj(dp, 2731 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2732 tag, &ddpa->origin_origin); 2733 if (error != 0) 2734 goto out; 2735 } 2736 out: 2737 if (error != 0) 2738 promote_rele(ddpa, tag); 2739 return (error); 2740 } 2741 2742 static void 2743 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2744 { 2745 snaplist_destroy(&ddpa->shared_snaps, tag); 2746 snaplist_destroy(&ddpa->clone_snaps, tag); 2747 snaplist_destroy(&ddpa->origin_snaps, tag); 2748 if (ddpa->origin_origin != NULL) 2749 dsl_dataset_rele(ddpa->origin_origin, tag); 2750 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2751 } 2752 2753 /* 2754 * Promote a clone. 2755 * 2756 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2757 * in with the name. (It must be at least MAXNAMELEN bytes long.) 2758 */ 2759 int 2760 dsl_dataset_promote(const char *name, char *conflsnap) 2761 { 2762 dsl_dataset_promote_arg_t ddpa = { 0 }; 2763 uint64_t numsnaps; 2764 int error; 2765 objset_t *os; 2766 2767 /* 2768 * We will modify space proportional to the number of 2769 * snapshots. Compute numsnaps. 2770 */ 2771 error = dmu_objset_hold(name, FTAG, &os); 2772 if (error != 0) 2773 return (error); 2774 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2775 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2776 &numsnaps); 2777 dmu_objset_rele(os, FTAG); 2778 if (error != 0) 2779 return (error); 2780 2781 ddpa.ddpa_clonename = name; 2782 ddpa.err_ds = conflsnap; 2783 ddpa.cr = CRED(); 2784 2785 return (dsl_sync_task(name, dsl_dataset_promote_check, 2786 dsl_dataset_promote_sync, &ddpa, 2787 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2788 } 2789 2790 int 2791 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2792 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2793 { 2794 /* 2795 * "slack" factor for received datasets with refquota set on them. 2796 * See the bottom of this function for details on its use. 2797 */ 2798 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 2799 int64_t unused_refres_delta; 2800 2801 /* they should both be heads */ 2802 if (clone->ds_is_snapshot || 2803 origin_head->ds_is_snapshot) 2804 return (SET_ERROR(EINVAL)); 2805 2806 /* if we are not forcing, the branch point should be just before them */ 2807 if (!force && clone->ds_prev != origin_head->ds_prev) 2808 return (SET_ERROR(EINVAL)); 2809 2810 /* clone should be the clone (unless they are unrelated) */ 2811 if (clone->ds_prev != NULL && 2812 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2813 origin_head->ds_dir != clone->ds_prev->ds_dir) 2814 return (SET_ERROR(EINVAL)); 2815 2816 /* the clone should be a child of the origin */ 2817 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2818 return (SET_ERROR(EINVAL)); 2819 2820 /* origin_head shouldn't be modified unless 'force' */ 2821 if (!force && 2822 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2823 return (SET_ERROR(ETXTBSY)); 2824 2825 /* origin_head should have no long holds (e.g. is not mounted) */ 2826 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2827 return (SET_ERROR(EBUSY)); 2828 2829 /* check amount of any unconsumed refreservation */ 2830 unused_refres_delta = 2831 (int64_t)MIN(origin_head->ds_reserved, 2832 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2833 (int64_t)MIN(origin_head->ds_reserved, 2834 dsl_dataset_phys(clone)->ds_unique_bytes); 2835 2836 if (unused_refres_delta > 0 && 2837 unused_refres_delta > 2838 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2839 return (SET_ERROR(ENOSPC)); 2840 2841 /* 2842 * The clone can't be too much over the head's refquota. 2843 * 2844 * To ensure that the entire refquota can be used, we allow one 2845 * transaction to exceed the the refquota. Therefore, this check 2846 * needs to also allow for the space referenced to be more than the 2847 * refquota. The maximum amount of space that one transaction can use 2848 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 2849 * overage ensures that we are able to receive a filesystem that 2850 * exceeds the refquota on the source system. 2851 * 2852 * So that overage is the refquota_slack we use below. 2853 */ 2854 if (origin_head->ds_quota != 0 && 2855 dsl_dataset_phys(clone)->ds_referenced_bytes > 2856 origin_head->ds_quota + refquota_slack) 2857 return (SET_ERROR(EDQUOT)); 2858 2859 return (0); 2860 } 2861 2862 void 2863 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2864 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2865 { 2866 dsl_pool_t *dp = dmu_tx_pool(tx); 2867 int64_t unused_refres_delta; 2868 2869 ASSERT(clone->ds_reserved == 0); 2870 /* 2871 * NOTE: On DEBUG kernels there could be a race between this and 2872 * the check function if spa_asize_inflation is adjusted... 2873 */ 2874 ASSERT(origin_head->ds_quota == 0 || 2875 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 2876 DMU_MAX_ACCESS * spa_asize_inflation); 2877 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2878 2879 /* 2880 * Swap per-dataset feature flags. 2881 */ 2882 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2883 if (!(spa_feature_table[f].fi_flags & 2884 ZFEATURE_FLAG_PER_DATASET)) { 2885 ASSERT(!clone->ds_feature_inuse[f]); 2886 ASSERT(!origin_head->ds_feature_inuse[f]); 2887 continue; 2888 } 2889 2890 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 2891 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 2892 2893 if (clone_inuse) { 2894 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 2895 clone->ds_feature_inuse[f] = B_FALSE; 2896 } 2897 if (origin_head_inuse) { 2898 dsl_dataset_deactivate_feature(origin_head->ds_object, 2899 f, tx); 2900 origin_head->ds_feature_inuse[f] = B_FALSE; 2901 } 2902 if (clone_inuse) { 2903 dsl_dataset_activate_feature(origin_head->ds_object, 2904 f, tx); 2905 origin_head->ds_feature_inuse[f] = B_TRUE; 2906 } 2907 if (origin_head_inuse) { 2908 dsl_dataset_activate_feature(clone->ds_object, f, tx); 2909 clone->ds_feature_inuse[f] = B_TRUE; 2910 } 2911 } 2912 2913 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2914 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2915 2916 if (clone->ds_objset != NULL) { 2917 dmu_objset_evict(clone->ds_objset); 2918 clone->ds_objset = NULL; 2919 } 2920 2921 if (origin_head->ds_objset != NULL) { 2922 dmu_objset_evict(origin_head->ds_objset); 2923 origin_head->ds_objset = NULL; 2924 } 2925 2926 unused_refres_delta = 2927 (int64_t)MIN(origin_head->ds_reserved, 2928 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2929 (int64_t)MIN(origin_head->ds_reserved, 2930 dsl_dataset_phys(clone)->ds_unique_bytes); 2931 2932 /* 2933 * Reset origin's unique bytes, if it exists. 2934 */ 2935 if (clone->ds_prev) { 2936 dsl_dataset_t *origin = clone->ds_prev; 2937 uint64_t comp, uncomp; 2938 2939 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2940 dsl_deadlist_space_range(&clone->ds_deadlist, 2941 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 2942 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 2943 } 2944 2945 /* swap blkptrs */ 2946 { 2947 blkptr_t tmp; 2948 tmp = dsl_dataset_phys(origin_head)->ds_bp; 2949 dsl_dataset_phys(origin_head)->ds_bp = 2950 dsl_dataset_phys(clone)->ds_bp; 2951 dsl_dataset_phys(clone)->ds_bp = tmp; 2952 } 2953 2954 /* set dd_*_bytes */ 2955 { 2956 int64_t dused, dcomp, duncomp; 2957 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2958 uint64_t odl_used, odl_comp, odl_uncomp; 2959 2960 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 2961 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2962 2963 dsl_deadlist_space(&clone->ds_deadlist, 2964 &cdl_used, &cdl_comp, &cdl_uncomp); 2965 dsl_deadlist_space(&origin_head->ds_deadlist, 2966 &odl_used, &odl_comp, &odl_uncomp); 2967 2968 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 2969 cdl_used - 2970 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 2971 odl_used); 2972 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 2973 cdl_comp - 2974 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 2975 odl_comp); 2976 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 2977 cdl_uncomp - 2978 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 2979 odl_uncomp); 2980 2981 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2982 dused, dcomp, duncomp, tx); 2983 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2984 -dused, -dcomp, -duncomp, tx); 2985 2986 /* 2987 * The difference in the space used by snapshots is the 2988 * difference in snapshot space due to the head's 2989 * deadlist (since that's the only thing that's 2990 * changing that affects the snapused). 2991 */ 2992 dsl_deadlist_space_range(&clone->ds_deadlist, 2993 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2994 &cdl_used, &cdl_comp, &cdl_uncomp); 2995 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2996 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2997 &odl_used, &odl_comp, &odl_uncomp); 2998 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2999 DD_USED_HEAD, DD_USED_SNAP, tx); 3000 } 3001 3002 /* swap ds_*_bytes */ 3003 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3004 dsl_dataset_phys(clone)->ds_referenced_bytes); 3005 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3006 dsl_dataset_phys(clone)->ds_compressed_bytes); 3007 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3008 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3009 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3010 dsl_dataset_phys(clone)->ds_unique_bytes); 3011 3012 /* apply any parent delta for change in unconsumed refreservation */ 3013 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3014 unused_refres_delta, 0, 0, tx); 3015 3016 /* 3017 * Swap deadlists. 3018 */ 3019 dsl_deadlist_close(&clone->ds_deadlist); 3020 dsl_deadlist_close(&origin_head->ds_deadlist); 3021 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3022 dsl_dataset_phys(clone)->ds_deadlist_obj); 3023 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3024 dsl_dataset_phys(clone)->ds_deadlist_obj); 3025 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3026 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3027 3028 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3029 3030 spa_history_log_internal_ds(clone, "clone swap", tx, 3031 "parent=%s", origin_head->ds_dir->dd_myname); 3032 } 3033 3034 /* 3035 * Given a pool name and a dataset object number in that pool, 3036 * return the name of that dataset. 3037 */ 3038 int 3039 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3040 { 3041 dsl_pool_t *dp; 3042 dsl_dataset_t *ds; 3043 int error; 3044 3045 error = dsl_pool_hold(pname, FTAG, &dp); 3046 if (error != 0) 3047 return (error); 3048 3049 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3050 if (error == 0) { 3051 dsl_dataset_name(ds, buf); 3052 dsl_dataset_rele(ds, FTAG); 3053 } 3054 dsl_pool_rele(dp, FTAG); 3055 3056 return (error); 3057 } 3058 3059 int 3060 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3061 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3062 { 3063 int error = 0; 3064 3065 ASSERT3S(asize, >, 0); 3066 3067 /* 3068 * *ref_rsrv is the portion of asize that will come from any 3069 * unconsumed refreservation space. 3070 */ 3071 *ref_rsrv = 0; 3072 3073 mutex_enter(&ds->ds_lock); 3074 /* 3075 * Make a space adjustment for reserved bytes. 3076 */ 3077 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3078 ASSERT3U(*used, >=, 3079 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3080 *used -= 3081 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3082 *ref_rsrv = 3083 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3084 } 3085 3086 if (!check_quota || ds->ds_quota == 0) { 3087 mutex_exit(&ds->ds_lock); 3088 return (0); 3089 } 3090 /* 3091 * If they are requesting more space, and our current estimate 3092 * is over quota, they get to try again unless the actual 3093 * on-disk is over quota and there are no pending changes (which 3094 * may free up space for us). 3095 */ 3096 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3097 ds->ds_quota) { 3098 if (inflight > 0 || 3099 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3100 error = SET_ERROR(ERESTART); 3101 else 3102 error = SET_ERROR(EDQUOT); 3103 } 3104 mutex_exit(&ds->ds_lock); 3105 3106 return (error); 3107 } 3108 3109 typedef struct dsl_dataset_set_qr_arg { 3110 const char *ddsqra_name; 3111 zprop_source_t ddsqra_source; 3112 uint64_t ddsqra_value; 3113 } dsl_dataset_set_qr_arg_t; 3114 3115 3116 /* ARGSUSED */ 3117 static int 3118 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3119 { 3120 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3121 dsl_pool_t *dp = dmu_tx_pool(tx); 3122 dsl_dataset_t *ds; 3123 int error; 3124 uint64_t newval; 3125 3126 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3127 return (SET_ERROR(ENOTSUP)); 3128 3129 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3130 if (error != 0) 3131 return (error); 3132 3133 if (ds->ds_is_snapshot) { 3134 dsl_dataset_rele(ds, FTAG); 3135 return (SET_ERROR(EINVAL)); 3136 } 3137 3138 error = dsl_prop_predict(ds->ds_dir, 3139 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3140 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3141 if (error != 0) { 3142 dsl_dataset_rele(ds, FTAG); 3143 return (error); 3144 } 3145 3146 if (newval == 0) { 3147 dsl_dataset_rele(ds, FTAG); 3148 return (0); 3149 } 3150 3151 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3152 newval < ds->ds_reserved) { 3153 dsl_dataset_rele(ds, FTAG); 3154 return (SET_ERROR(ENOSPC)); 3155 } 3156 3157 dsl_dataset_rele(ds, FTAG); 3158 return (0); 3159 } 3160 3161 static void 3162 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3163 { 3164 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3165 dsl_pool_t *dp = dmu_tx_pool(tx); 3166 dsl_dataset_t *ds; 3167 uint64_t newval; 3168 3169 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3170 3171 dsl_prop_set_sync_impl(ds, 3172 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3173 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3174 &ddsqra->ddsqra_value, tx); 3175 3176 VERIFY0(dsl_prop_get_int_ds(ds, 3177 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3178 3179 if (ds->ds_quota != newval) { 3180 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3181 ds->ds_quota = newval; 3182 } 3183 dsl_dataset_rele(ds, FTAG); 3184 } 3185 3186 int 3187 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3188 uint64_t refquota) 3189 { 3190 dsl_dataset_set_qr_arg_t ddsqra; 3191 3192 ddsqra.ddsqra_name = dsname; 3193 ddsqra.ddsqra_source = source; 3194 ddsqra.ddsqra_value = refquota; 3195 3196 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3197 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3198 } 3199 3200 static int 3201 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3202 { 3203 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3204 dsl_pool_t *dp = dmu_tx_pool(tx); 3205 dsl_dataset_t *ds; 3206 int error; 3207 uint64_t newval, unique; 3208 3209 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3210 return (SET_ERROR(ENOTSUP)); 3211 3212 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3213 if (error != 0) 3214 return (error); 3215 3216 if (ds->ds_is_snapshot) { 3217 dsl_dataset_rele(ds, FTAG); 3218 return (SET_ERROR(EINVAL)); 3219 } 3220 3221 error = dsl_prop_predict(ds->ds_dir, 3222 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3223 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3224 if (error != 0) { 3225 dsl_dataset_rele(ds, FTAG); 3226 return (error); 3227 } 3228 3229 /* 3230 * If we are doing the preliminary check in open context, the 3231 * space estimates may be inaccurate. 3232 */ 3233 if (!dmu_tx_is_syncing(tx)) { 3234 dsl_dataset_rele(ds, FTAG); 3235 return (0); 3236 } 3237 3238 mutex_enter(&ds->ds_lock); 3239 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3240 dsl_dataset_recalc_head_uniq(ds); 3241 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3242 mutex_exit(&ds->ds_lock); 3243 3244 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3245 uint64_t delta = MAX(unique, newval) - 3246 MAX(unique, ds->ds_reserved); 3247 3248 if (delta > 3249 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3250 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3251 dsl_dataset_rele(ds, FTAG); 3252 return (SET_ERROR(ENOSPC)); 3253 } 3254 } 3255 3256 dsl_dataset_rele(ds, FTAG); 3257 return (0); 3258 } 3259 3260 void 3261 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3262 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3263 { 3264 uint64_t newval; 3265 uint64_t unique; 3266 int64_t delta; 3267 3268 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3269 source, sizeof (value), 1, &value, tx); 3270 3271 VERIFY0(dsl_prop_get_int_ds(ds, 3272 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3273 3274 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3275 mutex_enter(&ds->ds_dir->dd_lock); 3276 mutex_enter(&ds->ds_lock); 3277 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3278 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3279 delta = MAX(0, (int64_t)(newval - unique)) - 3280 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3281 ds->ds_reserved = newval; 3282 mutex_exit(&ds->ds_lock); 3283 3284 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3285 mutex_exit(&ds->ds_dir->dd_lock); 3286 } 3287 3288 static void 3289 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3290 { 3291 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3292 dsl_pool_t *dp = dmu_tx_pool(tx); 3293 dsl_dataset_t *ds; 3294 3295 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3296 dsl_dataset_set_refreservation_sync_impl(ds, 3297 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3298 dsl_dataset_rele(ds, FTAG); 3299 } 3300 3301 int 3302 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3303 uint64_t refreservation) 3304 { 3305 dsl_dataset_set_qr_arg_t ddsqra; 3306 3307 ddsqra.ddsqra_name = dsname; 3308 ddsqra.ddsqra_source = source; 3309 ddsqra.ddsqra_value = refreservation; 3310 3311 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3312 dsl_dataset_set_refreservation_sync, &ddsqra, 3313 0, ZFS_SPACE_CHECK_NONE)); 3314 } 3315 3316 /* 3317 * Return (in *usedp) the amount of space written in new that is not 3318 * present in oldsnap. New may be a snapshot or the head. Old must be 3319 * a snapshot before new, in new's filesystem (or its origin). If not then 3320 * fail and return EINVAL. 3321 * 3322 * The written space is calculated by considering two components: First, we 3323 * ignore any freed space, and calculate the written as new's used space 3324 * minus old's used space. Next, we add in the amount of space that was freed 3325 * between the two snapshots, thus reducing new's used space relative to old's. 3326 * Specifically, this is the space that was born before old->ds_creation_txg, 3327 * and freed before new (ie. on new's deadlist or a previous deadlist). 3328 * 3329 * space freed [---------------------] 3330 * snapshots ---O-------O--------O-------O------ 3331 * oldsnap new 3332 */ 3333 int 3334 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3335 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3336 { 3337 int err = 0; 3338 uint64_t snapobj; 3339 dsl_pool_t *dp = new->ds_dir->dd_pool; 3340 3341 ASSERT(dsl_pool_config_held(dp)); 3342 3343 *usedp = 0; 3344 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3345 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3346 3347 *compp = 0; 3348 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3349 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3350 3351 *uncompp = 0; 3352 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3353 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3354 3355 snapobj = new->ds_object; 3356 while (snapobj != oldsnap->ds_object) { 3357 dsl_dataset_t *snap; 3358 uint64_t used, comp, uncomp; 3359 3360 if (snapobj == new->ds_object) { 3361 snap = new; 3362 } else { 3363 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3364 if (err != 0) 3365 break; 3366 } 3367 3368 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3369 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3370 /* 3371 * The blocks in the deadlist can not be born after 3372 * ds_prev_snap_txg, so get the whole deadlist space, 3373 * which is more efficient (especially for old-format 3374 * deadlists). Unfortunately the deadlist code 3375 * doesn't have enough information to make this 3376 * optimization itself. 3377 */ 3378 dsl_deadlist_space(&snap->ds_deadlist, 3379 &used, &comp, &uncomp); 3380 } else { 3381 dsl_deadlist_space_range(&snap->ds_deadlist, 3382 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3383 &used, &comp, &uncomp); 3384 } 3385 *usedp += used; 3386 *compp += comp; 3387 *uncompp += uncomp; 3388 3389 /* 3390 * If we get to the beginning of the chain of snapshots 3391 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3392 * was not a snapshot of/before new. 3393 */ 3394 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3395 if (snap != new) 3396 dsl_dataset_rele(snap, FTAG); 3397 if (snapobj == 0) { 3398 err = SET_ERROR(EINVAL); 3399 break; 3400 } 3401 3402 } 3403 return (err); 3404 } 3405 3406 /* 3407 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3408 * lastsnap, and all snapshots in between are deleted. 3409 * 3410 * blocks that would be freed [---------------------------] 3411 * snapshots ---O-------O--------O-------O--------O 3412 * firstsnap lastsnap 3413 * 3414 * This is the set of blocks that were born after the snap before firstsnap, 3415 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3416 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3417 * We calculate this by iterating over the relevant deadlists (from the snap 3418 * after lastsnap, backward to the snap after firstsnap), summing up the 3419 * space on the deadlist that was born after the snap before firstsnap. 3420 */ 3421 int 3422 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3423 dsl_dataset_t *lastsnap, 3424 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3425 { 3426 int err = 0; 3427 uint64_t snapobj; 3428 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3429 3430 ASSERT(firstsnap->ds_is_snapshot); 3431 ASSERT(lastsnap->ds_is_snapshot); 3432 3433 /* 3434 * Check that the snapshots are in the same dsl_dir, and firstsnap 3435 * is before lastsnap. 3436 */ 3437 if (firstsnap->ds_dir != lastsnap->ds_dir || 3438 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3439 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3440 return (SET_ERROR(EINVAL)); 3441 3442 *usedp = *compp = *uncompp = 0; 3443 3444 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3445 while (snapobj != firstsnap->ds_object) { 3446 dsl_dataset_t *ds; 3447 uint64_t used, comp, uncomp; 3448 3449 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3450 if (err != 0) 3451 break; 3452 3453 dsl_deadlist_space_range(&ds->ds_deadlist, 3454 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3455 &used, &comp, &uncomp); 3456 *usedp += used; 3457 *compp += comp; 3458 *uncompp += uncomp; 3459 3460 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3461 ASSERT3U(snapobj, !=, 0); 3462 dsl_dataset_rele(ds, FTAG); 3463 } 3464 return (err); 3465 } 3466 3467 /* 3468 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3469 * For example, they could both be snapshots of the same filesystem, and 3470 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3471 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3472 * filesystem. Or 'earlier' could be the origin's origin. 3473 * 3474 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3475 */ 3476 boolean_t 3477 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3478 uint64_t earlier_txg) 3479 { 3480 dsl_pool_t *dp = later->ds_dir->dd_pool; 3481 int error; 3482 boolean_t ret; 3483 3484 ASSERT(dsl_pool_config_held(dp)); 3485 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3486 3487 if (earlier_txg == 0) 3488 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3489 3490 if (later->ds_is_snapshot && 3491 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3492 return (B_FALSE); 3493 3494 if (later->ds_dir == earlier->ds_dir) 3495 return (B_TRUE); 3496 if (!dsl_dir_is_clone(later->ds_dir)) 3497 return (B_FALSE); 3498 3499 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3500 return (B_TRUE); 3501 dsl_dataset_t *origin; 3502 error = dsl_dataset_hold_obj(dp, 3503 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3504 if (error != 0) 3505 return (B_FALSE); 3506 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3507 dsl_dataset_rele(origin, FTAG); 3508 return (ret); 3509 } 3510 3511 void 3512 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3513 { 3514 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3515 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3516 } 3517 3518 boolean_t 3519 dsl_dataset_is_zapified(dsl_dataset_t *ds) 3520 { 3521 dmu_object_info_t doi; 3522 3523 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3524 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3525 } 3526 3527 boolean_t 3528 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3529 { 3530 return (dsl_dataset_is_zapified(ds) && 3531 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3532 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3533 } 3534