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 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 669 <, ZFS_MAX_DATASET_NAME_LEN); 670 /* 671 * We use a "recursive" mutex so that we 672 * can call dprintf_ds() with ds_lock held. 673 */ 674 if (!MUTEX_HELD(&ds->ds_lock)) { 675 mutex_enter(&ds->ds_lock); 676 VERIFY3U(strlcat(name, ds->ds_snapname, 677 ZFS_MAX_DATASET_NAME_LEN), <, 678 ZFS_MAX_DATASET_NAME_LEN); 679 mutex_exit(&ds->ds_lock); 680 } else { 681 VERIFY3U(strlcat(name, ds->ds_snapname, 682 ZFS_MAX_DATASET_NAME_LEN), <, 683 ZFS_MAX_DATASET_NAME_LEN); 684 } 685 } 686 } 687 } 688 689 int 690 dsl_dataset_namelen(dsl_dataset_t *ds) 691 { 692 VERIFY0(dsl_dataset_get_snapname(ds)); 693 mutex_enter(&ds->ds_lock); 694 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 695 mutex_exit(&ds->ds_lock); 696 return (len); 697 } 698 699 void 700 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 701 { 702 dmu_buf_rele(ds->ds_dbuf, tag); 703 } 704 705 void 706 dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 707 { 708 ASSERT3P(ds->ds_owner, ==, tag); 709 ASSERT(ds->ds_dbuf != NULL); 710 711 mutex_enter(&ds->ds_lock); 712 ds->ds_owner = NULL; 713 mutex_exit(&ds->ds_lock); 714 dsl_dataset_long_rele(ds, tag); 715 dsl_dataset_rele(ds, tag); 716 } 717 718 boolean_t 719 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 720 { 721 boolean_t gotit = FALSE; 722 723 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 724 mutex_enter(&ds->ds_lock); 725 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 726 ds->ds_owner = tag; 727 dsl_dataset_long_hold(ds, tag); 728 gotit = TRUE; 729 } 730 mutex_exit(&ds->ds_lock); 731 return (gotit); 732 } 733 734 boolean_t 735 dsl_dataset_has_owner(dsl_dataset_t *ds) 736 { 737 boolean_t rv; 738 mutex_enter(&ds->ds_lock); 739 rv = (ds->ds_owner != NULL); 740 mutex_exit(&ds->ds_lock); 741 return (rv); 742 } 743 744 static void 745 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 746 { 747 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 748 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 749 uint64_t zero = 0; 750 751 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 752 753 spa_feature_incr(spa, f, tx); 754 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 755 756 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 757 sizeof (zero), 1, &zero, tx)); 758 } 759 760 void 761 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 762 { 763 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 764 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 765 766 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 767 768 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 769 spa_feature_decr(spa, f, tx); 770 } 771 772 uint64_t 773 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 774 uint64_t flags, dmu_tx_t *tx) 775 { 776 dsl_pool_t *dp = dd->dd_pool; 777 dmu_buf_t *dbuf; 778 dsl_dataset_phys_t *dsphys; 779 uint64_t dsobj; 780 objset_t *mos = dp->dp_meta_objset; 781 782 if (origin == NULL) 783 origin = dp->dp_origin_snap; 784 785 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 786 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 787 ASSERT(dmu_tx_is_syncing(tx)); 788 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 789 790 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 791 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 792 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 793 dmu_buf_will_dirty(dbuf, tx); 794 dsphys = dbuf->db_data; 795 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 796 dsphys->ds_dir_obj = dd->dd_object; 797 dsphys->ds_flags = flags; 798 dsphys->ds_fsid_guid = unique_create(); 799 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 800 sizeof (dsphys->ds_guid)); 801 dsphys->ds_snapnames_zapobj = 802 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 803 DMU_OT_NONE, 0, tx); 804 dsphys->ds_creation_time = gethrestime_sec(); 805 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 806 807 if (origin == NULL) { 808 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 809 } else { 810 dsl_dataset_t *ohds; /* head of the origin snapshot */ 811 812 dsphys->ds_prev_snap_obj = origin->ds_object; 813 dsphys->ds_prev_snap_txg = 814 dsl_dataset_phys(origin)->ds_creation_txg; 815 dsphys->ds_referenced_bytes = 816 dsl_dataset_phys(origin)->ds_referenced_bytes; 817 dsphys->ds_compressed_bytes = 818 dsl_dataset_phys(origin)->ds_compressed_bytes; 819 dsphys->ds_uncompressed_bytes = 820 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 821 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 822 823 /* 824 * Inherit flags that describe the dataset's contents 825 * (INCONSISTENT) or properties (Case Insensitive). 826 */ 827 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 828 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 829 830 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 831 if (origin->ds_feature_inuse[f]) 832 dsl_dataset_activate_feature(dsobj, f, tx); 833 } 834 835 dmu_buf_will_dirty(origin->ds_dbuf, tx); 836 dsl_dataset_phys(origin)->ds_num_children++; 837 838 VERIFY0(dsl_dataset_hold_obj(dp, 839 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 840 FTAG, &ohds)); 841 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 842 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 843 dsl_dataset_rele(ohds, FTAG); 844 845 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 846 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 847 dsl_dataset_phys(origin)->ds_next_clones_obj = 848 zap_create(mos, 849 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 850 } 851 VERIFY0(zap_add_int(mos, 852 dsl_dataset_phys(origin)->ds_next_clones_obj, 853 dsobj, tx)); 854 } 855 856 dmu_buf_will_dirty(dd->dd_dbuf, tx); 857 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 858 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 859 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 860 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 861 dsl_dir_phys(origin->ds_dir)->dd_clones = 862 zap_create(mos, 863 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 864 } 865 VERIFY0(zap_add_int(mos, 866 dsl_dir_phys(origin->ds_dir)->dd_clones, 867 dsobj, tx)); 868 } 869 } 870 871 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 872 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 873 874 dmu_buf_rele(dbuf, FTAG); 875 876 dmu_buf_will_dirty(dd->dd_dbuf, tx); 877 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 878 879 return (dsobj); 880 } 881 882 static void 883 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 884 { 885 objset_t *os; 886 887 VERIFY0(dmu_objset_from_ds(ds, &os)); 888 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 889 dsl_dataset_dirty(ds, tx); 890 } 891 892 uint64_t 893 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 894 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 895 { 896 dsl_pool_t *dp = pdd->dd_pool; 897 uint64_t dsobj, ddobj; 898 dsl_dir_t *dd; 899 900 ASSERT(dmu_tx_is_syncing(tx)); 901 ASSERT(lastname[0] != '@'); 902 903 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 904 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 905 906 dsobj = dsl_dataset_create_sync_dd(dd, origin, 907 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 908 909 dsl_deleg_set_create_perms(dd, tx, cr); 910 911 /* 912 * Since we're creating a new node we know it's a leaf, so we can 913 * initialize the counts if the limit feature is active. 914 */ 915 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 916 uint64_t cnt = 0; 917 objset_t *os = dd->dd_pool->dp_meta_objset; 918 919 dsl_dir_zapify(dd, tx); 920 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 921 sizeof (cnt), 1, &cnt, tx)); 922 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 923 sizeof (cnt), 1, &cnt, tx)); 924 } 925 926 dsl_dir_rele(dd, FTAG); 927 928 /* 929 * If we are creating a clone, make sure we zero out any stale 930 * data from the origin snapshots zil header. 931 */ 932 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 933 dsl_dataset_t *ds; 934 935 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 936 dsl_dataset_zero_zil(ds, tx); 937 dsl_dataset_rele(ds, FTAG); 938 } 939 940 return (dsobj); 941 } 942 943 /* 944 * The unique space in the head dataset can be calculated by subtracting 945 * the space used in the most recent snapshot, that is still being used 946 * in this file system, from the space currently in use. To figure out 947 * the space in the most recent snapshot still in use, we need to take 948 * the total space used in the snapshot and subtract out the space that 949 * has been freed up since the snapshot was taken. 950 */ 951 void 952 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 953 { 954 uint64_t mrs_used; 955 uint64_t dlused, dlcomp, dluncomp; 956 957 ASSERT(!ds->ds_is_snapshot); 958 959 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 960 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 961 else 962 mrs_used = 0; 963 964 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 965 966 ASSERT3U(dlused, <=, mrs_used); 967 dsl_dataset_phys(ds)->ds_unique_bytes = 968 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 969 970 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 971 SPA_VERSION_UNIQUE_ACCURATE) 972 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 973 } 974 975 void 976 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 977 dmu_tx_t *tx) 978 { 979 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 980 uint64_t count; 981 int err; 982 983 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 984 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 985 obj, tx); 986 /* 987 * The err should not be ENOENT, but a bug in a previous version 988 * of the code could cause upgrade_clones_cb() to not set 989 * ds_next_snap_obj when it should, leading to a missing entry. 990 * If we knew that the pool was created after 991 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 992 * ENOENT. However, at least we can check that we don't have 993 * too many entries in the next_clones_obj even after failing to 994 * remove this one. 995 */ 996 if (err != ENOENT) 997 VERIFY0(err); 998 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 999 &count)); 1000 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 1001 } 1002 1003 1004 blkptr_t * 1005 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 1006 { 1007 return (&dsl_dataset_phys(ds)->ds_bp); 1008 } 1009 1010 spa_t * 1011 dsl_dataset_get_spa(dsl_dataset_t *ds) 1012 { 1013 return (ds->ds_dir->dd_pool->dp_spa); 1014 } 1015 1016 void 1017 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1018 { 1019 dsl_pool_t *dp; 1020 1021 if (ds == NULL) /* this is the meta-objset */ 1022 return; 1023 1024 ASSERT(ds->ds_objset != NULL); 1025 1026 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1027 panic("dirtying snapshot!"); 1028 1029 dp = ds->ds_dir->dd_pool; 1030 1031 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1032 /* up the hold count until we can be written out */ 1033 dmu_buf_add_ref(ds->ds_dbuf, ds); 1034 } 1035 } 1036 1037 boolean_t 1038 dsl_dataset_is_dirty(dsl_dataset_t *ds) 1039 { 1040 for (int t = 0; t < TXG_SIZE; t++) { 1041 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1042 ds, t)) 1043 return (B_TRUE); 1044 } 1045 return (B_FALSE); 1046 } 1047 1048 static int 1049 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1050 { 1051 uint64_t asize; 1052 1053 if (!dmu_tx_is_syncing(tx)) 1054 return (0); 1055 1056 /* 1057 * If there's an fs-only reservation, any blocks that might become 1058 * owned by the snapshot dataset must be accommodated by space 1059 * outside of the reservation. 1060 */ 1061 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1062 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1063 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1064 return (SET_ERROR(ENOSPC)); 1065 1066 /* 1067 * Propagate any reserved space for this snapshot to other 1068 * snapshot checks in this sync group. 1069 */ 1070 if (asize > 0) 1071 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1072 1073 return (0); 1074 } 1075 1076 typedef struct dsl_dataset_snapshot_arg { 1077 nvlist_t *ddsa_snaps; 1078 nvlist_t *ddsa_props; 1079 nvlist_t *ddsa_errors; 1080 cred_t *ddsa_cr; 1081 } dsl_dataset_snapshot_arg_t; 1082 1083 int 1084 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1085 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1086 { 1087 int error; 1088 uint64_t value; 1089 1090 ds->ds_trysnap_txg = tx->tx_txg; 1091 1092 if (!dmu_tx_is_syncing(tx)) 1093 return (0); 1094 1095 /* 1096 * We don't allow multiple snapshots of the same txg. If there 1097 * is already one, try again. 1098 */ 1099 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1100 return (SET_ERROR(EAGAIN)); 1101 1102 /* 1103 * Check for conflicting snapshot name. 1104 */ 1105 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1106 if (error == 0) 1107 return (SET_ERROR(EEXIST)); 1108 if (error != ENOENT) 1109 return (error); 1110 1111 /* 1112 * We don't allow taking snapshots of inconsistent datasets, such as 1113 * those into which we are currently receiving. However, if we are 1114 * creating this snapshot as part of a receive, this check will be 1115 * executed atomically with respect to the completion of the receive 1116 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1117 * case we ignore this, knowing it will be fixed up for us shortly in 1118 * dmu_recv_end_sync(). 1119 */ 1120 if (!recv && DS_IS_INCONSISTENT(ds)) 1121 return (SET_ERROR(EBUSY)); 1122 1123 /* 1124 * Skip the check for temporary snapshots or if we have already checked 1125 * the counts in dsl_dataset_snapshot_check. This means we really only 1126 * check the count here when we're receiving a stream. 1127 */ 1128 if (cnt != 0 && cr != NULL) { 1129 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1130 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1131 if (error != 0) 1132 return (error); 1133 } 1134 1135 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1136 if (error != 0) 1137 return (error); 1138 1139 return (0); 1140 } 1141 1142 static int 1143 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1144 { 1145 dsl_dataset_snapshot_arg_t *ddsa = arg; 1146 dsl_pool_t *dp = dmu_tx_pool(tx); 1147 nvpair_t *pair; 1148 int rv = 0; 1149 1150 /* 1151 * Pre-compute how many total new snapshots will be created for each 1152 * level in the tree and below. This is needed for validating the 1153 * snapshot limit when either taking a recursive snapshot or when 1154 * taking multiple snapshots. 1155 * 1156 * The problem is that the counts are not actually adjusted when 1157 * we are checking, only when we finally sync. For a single snapshot, 1158 * this is easy, the count will increase by 1 at each node up the tree, 1159 * but its more complicated for the recursive/multiple snapshot case. 1160 * 1161 * The dsl_fs_ss_limit_check function does recursively check the count 1162 * at each level up the tree but since it is validating each snapshot 1163 * independently we need to be sure that we are validating the complete 1164 * count for the entire set of snapshots. We do this by rolling up the 1165 * counts for each component of the name into an nvlist and then 1166 * checking each of those cases with the aggregated count. 1167 * 1168 * This approach properly handles not only the recursive snapshot 1169 * case (where we get all of those on the ddsa_snaps list) but also 1170 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1171 * validate the limit on 'a' using a count of 2). 1172 * 1173 * We validate the snapshot names in the third loop and only report 1174 * name errors once. 1175 */ 1176 if (dmu_tx_is_syncing(tx)) { 1177 nvlist_t *cnt_track = NULL; 1178 cnt_track = fnvlist_alloc(); 1179 1180 /* Rollup aggregated counts into the cnt_track list */ 1181 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1182 pair != NULL; 1183 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1184 char *pdelim; 1185 uint64_t val; 1186 char nm[MAXPATHLEN]; 1187 1188 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1189 pdelim = strchr(nm, '@'); 1190 if (pdelim == NULL) 1191 continue; 1192 *pdelim = '\0'; 1193 1194 do { 1195 if (nvlist_lookup_uint64(cnt_track, nm, 1196 &val) == 0) { 1197 /* update existing entry */ 1198 fnvlist_add_uint64(cnt_track, nm, 1199 val + 1); 1200 } else { 1201 /* add to list */ 1202 fnvlist_add_uint64(cnt_track, nm, 1); 1203 } 1204 1205 pdelim = strrchr(nm, '/'); 1206 if (pdelim != NULL) 1207 *pdelim = '\0'; 1208 } while (pdelim != NULL); 1209 } 1210 1211 /* Check aggregated counts at each level */ 1212 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1213 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1214 int error = 0; 1215 char *name; 1216 uint64_t cnt = 0; 1217 dsl_dataset_t *ds; 1218 1219 name = nvpair_name(pair); 1220 cnt = fnvpair_value_uint64(pair); 1221 ASSERT(cnt > 0); 1222 1223 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1224 if (error == 0) { 1225 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1226 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1227 ddsa->ddsa_cr); 1228 dsl_dataset_rele(ds, FTAG); 1229 } 1230 1231 if (error != 0) { 1232 if (ddsa->ddsa_errors != NULL) 1233 fnvlist_add_int32(ddsa->ddsa_errors, 1234 name, error); 1235 rv = error; 1236 /* only report one error for this check */ 1237 break; 1238 } 1239 } 1240 nvlist_free(cnt_track); 1241 } 1242 1243 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1244 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1245 int error = 0; 1246 dsl_dataset_t *ds; 1247 char *name, *atp; 1248 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1249 1250 name = nvpair_name(pair); 1251 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1252 error = SET_ERROR(ENAMETOOLONG); 1253 if (error == 0) { 1254 atp = strchr(name, '@'); 1255 if (atp == NULL) 1256 error = SET_ERROR(EINVAL); 1257 if (error == 0) 1258 (void) strlcpy(dsname, name, atp - name + 1); 1259 } 1260 if (error == 0) 1261 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1262 if (error == 0) { 1263 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1264 error = dsl_dataset_snapshot_check_impl(ds, 1265 atp + 1, tx, B_FALSE, 0, NULL); 1266 dsl_dataset_rele(ds, FTAG); 1267 } 1268 1269 if (error != 0) { 1270 if (ddsa->ddsa_errors != NULL) { 1271 fnvlist_add_int32(ddsa->ddsa_errors, 1272 name, error); 1273 } 1274 rv = error; 1275 } 1276 } 1277 1278 return (rv); 1279 } 1280 1281 void 1282 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1283 dmu_tx_t *tx) 1284 { 1285 static zil_header_t zero_zil; 1286 1287 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1288 dmu_buf_t *dbuf; 1289 dsl_dataset_phys_t *dsphys; 1290 uint64_t dsobj, crtxg; 1291 objset_t *mos = dp->dp_meta_objset; 1292 objset_t *os; 1293 1294 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1295 1296 /* 1297 * If we are on an old pool, the zil must not be active, in which 1298 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1299 */ 1300 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1301 dmu_objset_from_ds(ds, &os) != 0 || 1302 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1303 sizeof (zero_zil)) == 0); 1304 1305 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1306 1307 /* 1308 * The origin's ds_creation_txg has to be < TXG_INITIAL 1309 */ 1310 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1311 crtxg = 1; 1312 else 1313 crtxg = tx->tx_txg; 1314 1315 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1316 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1317 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1318 dmu_buf_will_dirty(dbuf, tx); 1319 dsphys = dbuf->db_data; 1320 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1321 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1322 dsphys->ds_fsid_guid = unique_create(); 1323 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1324 sizeof (dsphys->ds_guid)); 1325 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1326 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1327 dsphys->ds_next_snap_obj = ds->ds_object; 1328 dsphys->ds_num_children = 1; 1329 dsphys->ds_creation_time = gethrestime_sec(); 1330 dsphys->ds_creation_txg = crtxg; 1331 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1332 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1333 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1334 dsphys->ds_uncompressed_bytes = 1335 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1336 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1337 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1338 dmu_buf_rele(dbuf, FTAG); 1339 1340 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1341 if (ds->ds_feature_inuse[f]) 1342 dsl_dataset_activate_feature(dsobj, f, tx); 1343 } 1344 1345 ASSERT3U(ds->ds_prev != 0, ==, 1346 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1347 if (ds->ds_prev) { 1348 uint64_t next_clones_obj = 1349 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1350 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1351 ds->ds_object || 1352 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1353 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1354 ds->ds_object) { 1355 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1356 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1357 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1358 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1359 } else if (next_clones_obj != 0) { 1360 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1361 dsphys->ds_next_snap_obj, tx); 1362 VERIFY0(zap_add_int(mos, 1363 next_clones_obj, dsobj, tx)); 1364 } 1365 } 1366 1367 /* 1368 * If we have a reference-reservation on this dataset, we will 1369 * need to increase the amount of refreservation being charged 1370 * since our unique space is going to zero. 1371 */ 1372 if (ds->ds_reserved) { 1373 int64_t delta; 1374 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1375 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1376 ds->ds_reserved); 1377 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1378 delta, 0, 0, tx); 1379 } 1380 1381 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1382 dsl_dataset_phys(ds)->ds_deadlist_obj = 1383 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1384 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1385 dsl_deadlist_close(&ds->ds_deadlist); 1386 dsl_deadlist_open(&ds->ds_deadlist, mos, 1387 dsl_dataset_phys(ds)->ds_deadlist_obj); 1388 dsl_deadlist_add_key(&ds->ds_deadlist, 1389 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1390 1391 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1392 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1393 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1394 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1395 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1396 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1397 1398 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1399 snapname, 8, 1, &dsobj, tx)); 1400 1401 if (ds->ds_prev) 1402 dsl_dataset_rele(ds->ds_prev, ds); 1403 VERIFY0(dsl_dataset_hold_obj(dp, 1404 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1405 1406 dsl_scan_ds_snapshotted(ds, tx); 1407 1408 dsl_dir_snap_cmtime_update(ds->ds_dir); 1409 1410 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1411 } 1412 1413 static void 1414 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1415 { 1416 dsl_dataset_snapshot_arg_t *ddsa = arg; 1417 dsl_pool_t *dp = dmu_tx_pool(tx); 1418 nvpair_t *pair; 1419 1420 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1421 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1422 dsl_dataset_t *ds; 1423 char *name, *atp; 1424 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1425 1426 name = nvpair_name(pair); 1427 atp = strchr(name, '@'); 1428 (void) strlcpy(dsname, name, atp - name + 1); 1429 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1430 1431 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1432 if (ddsa->ddsa_props != NULL) { 1433 dsl_props_set_sync_impl(ds->ds_prev, 1434 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1435 } 1436 dsl_dataset_rele(ds, FTAG); 1437 } 1438 } 1439 1440 /* 1441 * The snapshots must all be in the same pool. 1442 * All-or-nothing: if there are any failures, nothing will be modified. 1443 */ 1444 int 1445 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1446 { 1447 dsl_dataset_snapshot_arg_t ddsa; 1448 nvpair_t *pair; 1449 boolean_t needsuspend; 1450 int error; 1451 spa_t *spa; 1452 char *firstname; 1453 nvlist_t *suspended = NULL; 1454 1455 pair = nvlist_next_nvpair(snaps, NULL); 1456 if (pair == NULL) 1457 return (0); 1458 firstname = nvpair_name(pair); 1459 1460 error = spa_open(firstname, &spa, FTAG); 1461 if (error != 0) 1462 return (error); 1463 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1464 spa_close(spa, FTAG); 1465 1466 if (needsuspend) { 1467 suspended = fnvlist_alloc(); 1468 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1469 pair = nvlist_next_nvpair(snaps, pair)) { 1470 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1471 char *snapname = nvpair_name(pair); 1472 char *atp; 1473 void *cookie; 1474 1475 atp = strchr(snapname, '@'); 1476 if (atp == NULL) { 1477 error = SET_ERROR(EINVAL); 1478 break; 1479 } 1480 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1481 1482 error = zil_suspend(fsname, &cookie); 1483 if (error != 0) 1484 break; 1485 fnvlist_add_uint64(suspended, fsname, 1486 (uintptr_t)cookie); 1487 } 1488 } 1489 1490 ddsa.ddsa_snaps = snaps; 1491 ddsa.ddsa_props = props; 1492 ddsa.ddsa_errors = errors; 1493 ddsa.ddsa_cr = CRED(); 1494 1495 if (error == 0) { 1496 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1497 dsl_dataset_snapshot_sync, &ddsa, 1498 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1499 } 1500 1501 if (suspended != NULL) { 1502 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1503 pair = nvlist_next_nvpair(suspended, pair)) { 1504 zil_resume((void *)(uintptr_t) 1505 fnvpair_value_uint64(pair)); 1506 } 1507 fnvlist_free(suspended); 1508 } 1509 1510 return (error); 1511 } 1512 1513 typedef struct dsl_dataset_snapshot_tmp_arg { 1514 const char *ddsta_fsname; 1515 const char *ddsta_snapname; 1516 minor_t ddsta_cleanup_minor; 1517 const char *ddsta_htag; 1518 } dsl_dataset_snapshot_tmp_arg_t; 1519 1520 static int 1521 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1522 { 1523 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1524 dsl_pool_t *dp = dmu_tx_pool(tx); 1525 dsl_dataset_t *ds; 1526 int error; 1527 1528 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1529 if (error != 0) 1530 return (error); 1531 1532 /* NULL cred means no limit check for tmp snapshot */ 1533 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1534 tx, B_FALSE, 0, NULL); 1535 if (error != 0) { 1536 dsl_dataset_rele(ds, FTAG); 1537 return (error); 1538 } 1539 1540 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1541 dsl_dataset_rele(ds, FTAG); 1542 return (SET_ERROR(ENOTSUP)); 1543 } 1544 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1545 B_TRUE, tx); 1546 if (error != 0) { 1547 dsl_dataset_rele(ds, FTAG); 1548 return (error); 1549 } 1550 1551 dsl_dataset_rele(ds, FTAG); 1552 return (0); 1553 } 1554 1555 static void 1556 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1557 { 1558 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1559 dsl_pool_t *dp = dmu_tx_pool(tx); 1560 dsl_dataset_t *ds; 1561 1562 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1563 1564 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1565 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1566 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1567 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1568 1569 dsl_dataset_rele(ds, FTAG); 1570 } 1571 1572 int 1573 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1574 minor_t cleanup_minor, const char *htag) 1575 { 1576 dsl_dataset_snapshot_tmp_arg_t ddsta; 1577 int error; 1578 spa_t *spa; 1579 boolean_t needsuspend; 1580 void *cookie; 1581 1582 ddsta.ddsta_fsname = fsname; 1583 ddsta.ddsta_snapname = snapname; 1584 ddsta.ddsta_cleanup_minor = cleanup_minor; 1585 ddsta.ddsta_htag = htag; 1586 1587 error = spa_open(fsname, &spa, FTAG); 1588 if (error != 0) 1589 return (error); 1590 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1591 spa_close(spa, FTAG); 1592 1593 if (needsuspend) { 1594 error = zil_suspend(fsname, &cookie); 1595 if (error != 0) 1596 return (error); 1597 } 1598 1599 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1600 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1601 1602 if (needsuspend) 1603 zil_resume(cookie); 1604 return (error); 1605 } 1606 1607 1608 void 1609 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1610 { 1611 ASSERT(dmu_tx_is_syncing(tx)); 1612 ASSERT(ds->ds_objset != NULL); 1613 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1614 1615 /* 1616 * in case we had to change ds_fsid_guid when we opened it, 1617 * sync it out now. 1618 */ 1619 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1620 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1621 1622 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1623 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1624 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1625 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1626 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1627 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1628 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1629 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1630 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1631 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1632 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1633 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1634 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1635 } 1636 1637 dmu_objset_sync(ds->ds_objset, zio, tx); 1638 1639 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1640 if (ds->ds_feature_activation_needed[f]) { 1641 if (ds->ds_feature_inuse[f]) 1642 continue; 1643 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1644 ds->ds_feature_inuse[f] = B_TRUE; 1645 } 1646 } 1647 } 1648 1649 static void 1650 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1651 { 1652 uint64_t count = 0; 1653 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1654 zap_cursor_t zc; 1655 zap_attribute_t za; 1656 nvlist_t *propval = fnvlist_alloc(); 1657 nvlist_t *val = fnvlist_alloc(); 1658 1659 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1660 1661 /* 1662 * There may be missing entries in ds_next_clones_obj 1663 * due to a bug in a previous version of the code. 1664 * Only trust it if it has the right number of entries. 1665 */ 1666 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1667 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1668 &count)); 1669 } 1670 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1671 goto fail; 1672 for (zap_cursor_init(&zc, mos, 1673 dsl_dataset_phys(ds)->ds_next_clones_obj); 1674 zap_cursor_retrieve(&zc, &za) == 0; 1675 zap_cursor_advance(&zc)) { 1676 dsl_dataset_t *clone; 1677 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1678 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1679 za.za_first_integer, FTAG, &clone)); 1680 dsl_dir_name(clone->ds_dir, buf); 1681 fnvlist_add_boolean(val, buf); 1682 dsl_dataset_rele(clone, FTAG); 1683 } 1684 zap_cursor_fini(&zc); 1685 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1686 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1687 fail: 1688 nvlist_free(val); 1689 nvlist_free(propval); 1690 } 1691 1692 static void 1693 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1694 { 1695 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1696 1697 if (dsl_dataset_has_resume_receive_state(ds)) { 1698 char *str; 1699 void *packed; 1700 uint8_t *compressed; 1701 uint64_t val; 1702 nvlist_t *token_nv = fnvlist_alloc(); 1703 size_t packed_size, compressed_size; 1704 1705 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1706 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1707 fnvlist_add_uint64(token_nv, "fromguid", val); 1708 } 1709 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1710 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1711 fnvlist_add_uint64(token_nv, "object", val); 1712 } 1713 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1714 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1715 fnvlist_add_uint64(token_nv, "offset", val); 1716 } 1717 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1718 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1719 fnvlist_add_uint64(token_nv, "bytes", val); 1720 } 1721 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1722 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1723 fnvlist_add_uint64(token_nv, "toguid", val); 1724 } 1725 char buf[256]; 1726 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1727 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1728 fnvlist_add_string(token_nv, "toname", buf); 1729 } 1730 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1731 DS_FIELD_RESUME_EMBEDOK) == 0) { 1732 fnvlist_add_boolean(token_nv, "embedok"); 1733 } 1734 packed = fnvlist_pack(token_nv, &packed_size); 1735 fnvlist_free(token_nv); 1736 compressed = kmem_alloc(packed_size, KM_SLEEP); 1737 1738 compressed_size = gzip_compress(packed, compressed, 1739 packed_size, packed_size, 6); 1740 1741 zio_cksum_t cksum; 1742 fletcher_4_native(compressed, compressed_size, NULL, &cksum); 1743 1744 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1745 for (int i = 0; i < compressed_size; i++) { 1746 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1747 } 1748 str[compressed_size * 2] = '\0'; 1749 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1750 ZFS_SEND_RESUME_TOKEN_VERSION, 1751 (longlong_t)cksum.zc_word[0], 1752 (longlong_t)packed_size, str); 1753 dsl_prop_nvlist_add_string(nv, 1754 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1755 kmem_free(packed, packed_size); 1756 kmem_free(str, compressed_size * 2 + 1); 1757 kmem_free(compressed, packed_size); 1758 strfree(propval); 1759 } 1760 } 1761 1762 void 1763 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1764 { 1765 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1766 uint64_t refd, avail, uobjs, aobjs, ratio; 1767 1768 ASSERT(dsl_pool_config_held(dp)); 1769 1770 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1771 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1772 dsl_dataset_phys(ds)->ds_compressed_bytes); 1773 1774 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1775 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1776 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1777 1778 if (ds->ds_is_snapshot) { 1779 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1780 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1781 dsl_dataset_phys(ds)->ds_unique_bytes); 1782 get_clones_stat(ds, nv); 1783 } else { 1784 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1785 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1786 dsl_dataset_name(ds->ds_prev, buf); 1787 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1788 } 1789 1790 dsl_dir_stats(ds->ds_dir, nv); 1791 } 1792 1793 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1794 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1795 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1796 1797 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1798 dsl_dataset_phys(ds)->ds_creation_time); 1799 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1800 dsl_dataset_phys(ds)->ds_creation_txg); 1801 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1802 ds->ds_quota); 1803 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1804 ds->ds_reserved); 1805 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1806 dsl_dataset_phys(ds)->ds_guid); 1807 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1808 dsl_dataset_phys(ds)->ds_unique_bytes); 1809 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1810 ds->ds_object); 1811 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1812 ds->ds_userrefs); 1813 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1814 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1815 1816 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1817 uint64_t written, comp, uncomp; 1818 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1819 dsl_dataset_t *prev; 1820 1821 int err = dsl_dataset_hold_obj(dp, 1822 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1823 if (err == 0) { 1824 err = dsl_dataset_space_written(prev, ds, &written, 1825 &comp, &uncomp); 1826 dsl_dataset_rele(prev, FTAG); 1827 if (err == 0) { 1828 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1829 written); 1830 } 1831 } 1832 } 1833 1834 if (!dsl_dataset_is_snapshot(ds)) { 1835 /* 1836 * A failed "newfs" (e.g. full) resumable receive leaves 1837 * the stats set on this dataset. Check here for the prop. 1838 */ 1839 get_receive_resume_stats(ds, nv); 1840 1841 /* 1842 * A failed incremental resumable receive leaves the 1843 * stats set on our child named "%recv". Check the child 1844 * for the prop. 1845 */ 1846 /* 6 extra bytes for /%recv */ 1847 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1848 dsl_dataset_t *recv_ds; 1849 dsl_dataset_name(ds, recvname); 1850 if (strlcat(recvname, "/", sizeof (recvname)) < 1851 sizeof (recvname) && 1852 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 1853 sizeof (recvname) && 1854 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1855 get_receive_resume_stats(recv_ds, nv); 1856 dsl_dataset_rele(recv_ds, FTAG); 1857 } 1858 } 1859 } 1860 1861 void 1862 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1863 { 1864 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1865 ASSERT(dsl_pool_config_held(dp)); 1866 1867 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1868 stat->dds_inconsistent = 1869 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1870 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1871 stat->dds_origin[0] = '\0'; 1872 if (ds->ds_is_snapshot) { 1873 stat->dds_is_snapshot = B_TRUE; 1874 stat->dds_num_clones = 1875 dsl_dataset_phys(ds)->ds_num_children - 1; 1876 } else { 1877 stat->dds_is_snapshot = B_FALSE; 1878 stat->dds_num_clones = 0; 1879 1880 if (dsl_dir_is_clone(ds->ds_dir)) { 1881 dsl_dataset_t *ods; 1882 1883 VERIFY0(dsl_dataset_hold_obj(dp, 1884 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1885 FTAG, &ods)); 1886 dsl_dataset_name(ods, stat->dds_origin); 1887 dsl_dataset_rele(ods, FTAG); 1888 } 1889 } 1890 } 1891 1892 uint64_t 1893 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1894 { 1895 return (ds->ds_fsid_guid); 1896 } 1897 1898 void 1899 dsl_dataset_space(dsl_dataset_t *ds, 1900 uint64_t *refdbytesp, uint64_t *availbytesp, 1901 uint64_t *usedobjsp, uint64_t *availobjsp) 1902 { 1903 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1904 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1905 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1906 *availbytesp += 1907 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1908 if (ds->ds_quota != 0) { 1909 /* 1910 * Adjust available bytes according to refquota 1911 */ 1912 if (*refdbytesp < ds->ds_quota) 1913 *availbytesp = MIN(*availbytesp, 1914 ds->ds_quota - *refdbytesp); 1915 else 1916 *availbytesp = 0; 1917 } 1918 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1919 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1920 } 1921 1922 boolean_t 1923 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1924 { 1925 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1926 1927 ASSERT(dsl_pool_config_held(dp)); 1928 if (snap == NULL) 1929 return (B_FALSE); 1930 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1931 dsl_dataset_phys(snap)->ds_creation_txg) { 1932 objset_t *os, *os_snap; 1933 /* 1934 * It may be that only the ZIL differs, because it was 1935 * reset in the head. Don't count that as being 1936 * modified. 1937 */ 1938 if (dmu_objset_from_ds(ds, &os) != 0) 1939 return (B_TRUE); 1940 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1941 return (B_TRUE); 1942 return (bcmp(&os->os_phys->os_meta_dnode, 1943 &os_snap->os_phys->os_meta_dnode, 1944 sizeof (os->os_phys->os_meta_dnode)) != 0); 1945 } 1946 return (B_FALSE); 1947 } 1948 1949 typedef struct dsl_dataset_rename_snapshot_arg { 1950 const char *ddrsa_fsname; 1951 const char *ddrsa_oldsnapname; 1952 const char *ddrsa_newsnapname; 1953 boolean_t ddrsa_recursive; 1954 dmu_tx_t *ddrsa_tx; 1955 } dsl_dataset_rename_snapshot_arg_t; 1956 1957 /* ARGSUSED */ 1958 static int 1959 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1960 dsl_dataset_t *hds, void *arg) 1961 { 1962 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1963 int error; 1964 uint64_t val; 1965 1966 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1967 if (error != 0) { 1968 /* ignore nonexistent snapshots */ 1969 return (error == ENOENT ? 0 : error); 1970 } 1971 1972 /* new name should not exist */ 1973 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1974 if (error == 0) 1975 error = SET_ERROR(EEXIST); 1976 else if (error == ENOENT) 1977 error = 0; 1978 1979 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1980 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1981 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 1982 error = SET_ERROR(ENAMETOOLONG); 1983 1984 return (error); 1985 } 1986 1987 static int 1988 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1989 { 1990 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1991 dsl_pool_t *dp = dmu_tx_pool(tx); 1992 dsl_dataset_t *hds; 1993 int error; 1994 1995 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1996 if (error != 0) 1997 return (error); 1998 1999 if (ddrsa->ddrsa_recursive) { 2000 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2001 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2002 DS_FIND_CHILDREN); 2003 } else { 2004 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2005 } 2006 dsl_dataset_rele(hds, FTAG); 2007 return (error); 2008 } 2009 2010 static int 2011 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2012 dsl_dataset_t *hds, void *arg) 2013 { 2014 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2015 dsl_dataset_t *ds; 2016 uint64_t val; 2017 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2018 int error; 2019 2020 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2021 ASSERT(error == 0 || error == ENOENT); 2022 if (error == ENOENT) { 2023 /* ignore nonexistent snapshots */ 2024 return (0); 2025 } 2026 2027 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2028 2029 /* log before we change the name */ 2030 spa_history_log_internal_ds(ds, "rename", tx, 2031 "-> @%s", ddrsa->ddrsa_newsnapname); 2032 2033 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2034 B_FALSE)); 2035 mutex_enter(&ds->ds_lock); 2036 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2037 mutex_exit(&ds->ds_lock); 2038 VERIFY0(zap_add(dp->dp_meta_objset, 2039 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2040 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2041 2042 dsl_dataset_rele(ds, FTAG); 2043 return (0); 2044 } 2045 2046 static void 2047 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2048 { 2049 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2050 dsl_pool_t *dp = dmu_tx_pool(tx); 2051 dsl_dataset_t *hds; 2052 2053 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2054 ddrsa->ddrsa_tx = tx; 2055 if (ddrsa->ddrsa_recursive) { 2056 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2057 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2058 DS_FIND_CHILDREN)); 2059 } else { 2060 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2061 } 2062 dsl_dataset_rele(hds, FTAG); 2063 } 2064 2065 int 2066 dsl_dataset_rename_snapshot(const char *fsname, 2067 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2068 { 2069 dsl_dataset_rename_snapshot_arg_t ddrsa; 2070 2071 ddrsa.ddrsa_fsname = fsname; 2072 ddrsa.ddrsa_oldsnapname = oldsnapname; 2073 ddrsa.ddrsa_newsnapname = newsnapname; 2074 ddrsa.ddrsa_recursive = recursive; 2075 2076 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2077 dsl_dataset_rename_snapshot_sync, &ddrsa, 2078 1, ZFS_SPACE_CHECK_RESERVED)); 2079 } 2080 2081 /* 2082 * If we're doing an ownership handoff, we need to make sure that there is 2083 * only one long hold on the dataset. We're not allowed to change anything here 2084 * so we don't permanently release the long hold or regular hold here. We want 2085 * to do this only when syncing to avoid the dataset unexpectedly going away 2086 * when we release the long hold. 2087 */ 2088 static int 2089 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2090 { 2091 boolean_t held; 2092 2093 if (!dmu_tx_is_syncing(tx)) 2094 return (0); 2095 2096 if (owner != NULL) { 2097 VERIFY3P(ds->ds_owner, ==, owner); 2098 dsl_dataset_long_rele(ds, owner); 2099 } 2100 2101 held = dsl_dataset_long_held(ds); 2102 2103 if (owner != NULL) 2104 dsl_dataset_long_hold(ds, owner); 2105 2106 if (held) 2107 return (SET_ERROR(EBUSY)); 2108 2109 return (0); 2110 } 2111 2112 typedef struct dsl_dataset_rollback_arg { 2113 const char *ddra_fsname; 2114 void *ddra_owner; 2115 nvlist_t *ddra_result; 2116 } dsl_dataset_rollback_arg_t; 2117 2118 static int 2119 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2120 { 2121 dsl_dataset_rollback_arg_t *ddra = arg; 2122 dsl_pool_t *dp = dmu_tx_pool(tx); 2123 dsl_dataset_t *ds; 2124 int64_t unused_refres_delta; 2125 int error; 2126 2127 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2128 if (error != 0) 2129 return (error); 2130 2131 /* must not be a snapshot */ 2132 if (ds->ds_is_snapshot) { 2133 dsl_dataset_rele(ds, FTAG); 2134 return (SET_ERROR(EINVAL)); 2135 } 2136 2137 /* must have a most recent snapshot */ 2138 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2139 dsl_dataset_rele(ds, FTAG); 2140 return (SET_ERROR(EINVAL)); 2141 } 2142 2143 /* must not have any bookmarks after the most recent snapshot */ 2144 nvlist_t *proprequest = fnvlist_alloc(); 2145 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2146 nvlist_t *bookmarks = fnvlist_alloc(); 2147 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2148 fnvlist_free(proprequest); 2149 if (error != 0) 2150 return (error); 2151 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2152 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2153 nvlist_t *valuenv = 2154 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2155 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2156 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2157 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2158 fnvlist_free(bookmarks); 2159 dsl_dataset_rele(ds, FTAG); 2160 return (SET_ERROR(EEXIST)); 2161 } 2162 } 2163 fnvlist_free(bookmarks); 2164 2165 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2166 if (error != 0) { 2167 dsl_dataset_rele(ds, FTAG); 2168 return (error); 2169 } 2170 2171 /* 2172 * Check if the snap we are rolling back to uses more than 2173 * the refquota. 2174 */ 2175 if (ds->ds_quota != 0 && 2176 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2177 dsl_dataset_rele(ds, FTAG); 2178 return (SET_ERROR(EDQUOT)); 2179 } 2180 2181 /* 2182 * When we do the clone swap, we will temporarily use more space 2183 * due to the refreservation (the head will no longer have any 2184 * unique space, so the entire amount of the refreservation will need 2185 * to be free). We will immediately destroy the clone, freeing 2186 * this space, but the freeing happens over many txg's. 2187 */ 2188 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2189 dsl_dataset_phys(ds)->ds_unique_bytes); 2190 2191 if (unused_refres_delta > 0 && 2192 unused_refres_delta > 2193 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2194 dsl_dataset_rele(ds, FTAG); 2195 return (SET_ERROR(ENOSPC)); 2196 } 2197 2198 dsl_dataset_rele(ds, FTAG); 2199 return (0); 2200 } 2201 2202 static void 2203 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2204 { 2205 dsl_dataset_rollback_arg_t *ddra = arg; 2206 dsl_pool_t *dp = dmu_tx_pool(tx); 2207 dsl_dataset_t *ds, *clone; 2208 uint64_t cloneobj; 2209 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2210 2211 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2212 2213 dsl_dataset_name(ds->ds_prev, namebuf); 2214 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2215 2216 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2217 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2218 2219 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2220 2221 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2222 dsl_dataset_zero_zil(ds, tx); 2223 2224 dsl_destroy_head_sync_impl(clone, tx); 2225 2226 dsl_dataset_rele(clone, FTAG); 2227 dsl_dataset_rele(ds, FTAG); 2228 } 2229 2230 /* 2231 * Rolls back the given filesystem or volume to the most recent snapshot. 2232 * The name of the most recent snapshot will be returned under key "target" 2233 * in the result nvlist. 2234 * 2235 * If owner != NULL: 2236 * - The existing dataset MUST be owned by the specified owner at entry 2237 * - Upon return, dataset will still be held by the same owner, whether we 2238 * succeed or not. 2239 * 2240 * This mode is required any time the existing filesystem is mounted. See 2241 * notes above zfs_suspend_fs() for further details. 2242 */ 2243 int 2244 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2245 { 2246 dsl_dataset_rollback_arg_t ddra; 2247 2248 ddra.ddra_fsname = fsname; 2249 ddra.ddra_owner = owner; 2250 ddra.ddra_result = result; 2251 2252 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2253 dsl_dataset_rollback_sync, &ddra, 2254 1, ZFS_SPACE_CHECK_RESERVED)); 2255 } 2256 2257 struct promotenode { 2258 list_node_t link; 2259 dsl_dataset_t *ds; 2260 }; 2261 2262 typedef struct dsl_dataset_promote_arg { 2263 const char *ddpa_clonename; 2264 dsl_dataset_t *ddpa_clone; 2265 list_t shared_snaps, origin_snaps, clone_snaps; 2266 dsl_dataset_t *origin_origin; /* origin of the origin */ 2267 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2268 char *err_ds; 2269 cred_t *cr; 2270 } dsl_dataset_promote_arg_t; 2271 2272 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2273 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2274 void *tag); 2275 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2276 2277 static int 2278 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2279 { 2280 dsl_dataset_promote_arg_t *ddpa = arg; 2281 dsl_pool_t *dp = dmu_tx_pool(tx); 2282 dsl_dataset_t *hds; 2283 struct promotenode *snap; 2284 dsl_dataset_t *origin_ds; 2285 int err; 2286 uint64_t unused; 2287 uint64_t ss_mv_cnt; 2288 size_t max_snap_len; 2289 2290 err = promote_hold(ddpa, dp, FTAG); 2291 if (err != 0) 2292 return (err); 2293 2294 hds = ddpa->ddpa_clone; 2295 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2296 2297 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2298 promote_rele(ddpa, FTAG); 2299 return (SET_ERROR(EXDEV)); 2300 } 2301 2302 /* 2303 * Compute and check the amount of space to transfer. Since this is 2304 * so expensive, don't do the preliminary check. 2305 */ 2306 if (!dmu_tx_is_syncing(tx)) { 2307 promote_rele(ddpa, FTAG); 2308 return (0); 2309 } 2310 2311 snap = list_head(&ddpa->shared_snaps); 2312 origin_ds = snap->ds; 2313 2314 /* compute origin's new unique space */ 2315 snap = list_tail(&ddpa->clone_snaps); 2316 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2317 origin_ds->ds_object); 2318 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2319 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2320 &ddpa->unique, &unused, &unused); 2321 2322 /* 2323 * Walk the snapshots that we are moving 2324 * 2325 * Compute space to transfer. Consider the incremental changes 2326 * to used by each snapshot: 2327 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2328 * So each snapshot gave birth to: 2329 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2330 * So a sequence would look like: 2331 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2332 * Which simplifies to: 2333 * uN + kN + kN-1 + ... + k1 + k0 2334 * Note however, if we stop before we reach the ORIGIN we get: 2335 * uN + kN + kN-1 + ... + kM - uM-1 2336 */ 2337 ss_mv_cnt = 0; 2338 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2339 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2340 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2341 for (snap = list_head(&ddpa->shared_snaps); snap; 2342 snap = list_next(&ddpa->shared_snaps, snap)) { 2343 uint64_t val, dlused, dlcomp, dluncomp; 2344 dsl_dataset_t *ds = snap->ds; 2345 2346 ss_mv_cnt++; 2347 2348 /* 2349 * If there are long holds, we won't be able to evict 2350 * the objset. 2351 */ 2352 if (dsl_dataset_long_held(ds)) { 2353 err = SET_ERROR(EBUSY); 2354 goto out; 2355 } 2356 2357 /* Check that the snapshot name does not conflict */ 2358 VERIFY0(dsl_dataset_get_snapname(ds)); 2359 if (strlen(ds->ds_snapname) >= max_snap_len) { 2360 err = SET_ERROR(ENAMETOOLONG); 2361 goto out; 2362 } 2363 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2364 if (err == 0) { 2365 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2366 err = SET_ERROR(EEXIST); 2367 goto out; 2368 } 2369 if (err != ENOENT) 2370 goto out; 2371 2372 /* The very first snapshot does not have a deadlist */ 2373 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2374 continue; 2375 2376 dsl_deadlist_space(&ds->ds_deadlist, 2377 &dlused, &dlcomp, &dluncomp); 2378 ddpa->used += dlused; 2379 ddpa->comp += dlcomp; 2380 ddpa->uncomp += dluncomp; 2381 } 2382 2383 /* 2384 * If we are a clone of a clone then we never reached ORIGIN, 2385 * so we need to subtract out the clone origin's used space. 2386 */ 2387 if (ddpa->origin_origin) { 2388 ddpa->used -= 2389 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2390 ddpa->comp -= 2391 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2392 ddpa->uncomp -= 2393 dsl_dataset_phys(ddpa->origin_origin)-> 2394 ds_uncompressed_bytes; 2395 } 2396 2397 /* Check that there is enough space and limit headroom here */ 2398 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2399 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2400 if (err != 0) 2401 goto out; 2402 2403 /* 2404 * Compute the amounts of space that will be used by snapshots 2405 * after the promotion (for both origin and clone). For each, 2406 * it is the amount of space that will be on all of their 2407 * deadlists (that was not born before their new origin). 2408 */ 2409 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2410 uint64_t space; 2411 2412 /* 2413 * Note, typically this will not be a clone of a clone, 2414 * so dd_origin_txg will be < TXG_INITIAL, so 2415 * these snaplist_space() -> dsl_deadlist_space_range() 2416 * calls will be fast because they do not have to 2417 * iterate over all bps. 2418 */ 2419 snap = list_head(&ddpa->origin_snaps); 2420 err = snaplist_space(&ddpa->shared_snaps, 2421 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2422 if (err != 0) 2423 goto out; 2424 2425 err = snaplist_space(&ddpa->clone_snaps, 2426 snap->ds->ds_dir->dd_origin_txg, &space); 2427 if (err != 0) 2428 goto out; 2429 ddpa->cloneusedsnap += space; 2430 } 2431 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2432 DD_FLAG_USED_BREAKDOWN) { 2433 err = snaplist_space(&ddpa->origin_snaps, 2434 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2435 &ddpa->originusedsnap); 2436 if (err != 0) 2437 goto out; 2438 } 2439 2440 out: 2441 promote_rele(ddpa, FTAG); 2442 return (err); 2443 } 2444 2445 static void 2446 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2447 { 2448 dsl_dataset_promote_arg_t *ddpa = arg; 2449 dsl_pool_t *dp = dmu_tx_pool(tx); 2450 dsl_dataset_t *hds; 2451 struct promotenode *snap; 2452 dsl_dataset_t *origin_ds; 2453 dsl_dataset_t *origin_head; 2454 dsl_dir_t *dd; 2455 dsl_dir_t *odd = NULL; 2456 uint64_t oldnext_obj; 2457 int64_t delta; 2458 2459 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2460 hds = ddpa->ddpa_clone; 2461 2462 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2463 2464 snap = list_head(&ddpa->shared_snaps); 2465 origin_ds = snap->ds; 2466 dd = hds->ds_dir; 2467 2468 snap = list_head(&ddpa->origin_snaps); 2469 origin_head = snap->ds; 2470 2471 /* 2472 * We need to explicitly open odd, since origin_ds's dd will be 2473 * changing. 2474 */ 2475 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2476 NULL, FTAG, &odd)); 2477 2478 /* change origin's next snap */ 2479 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2480 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2481 snap = list_tail(&ddpa->clone_snaps); 2482 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2483 origin_ds->ds_object); 2484 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2485 2486 /* change the origin's next clone */ 2487 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2488 dsl_dataset_remove_from_next_clones(origin_ds, 2489 snap->ds->ds_object, tx); 2490 VERIFY0(zap_add_int(dp->dp_meta_objset, 2491 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2492 oldnext_obj, tx)); 2493 } 2494 2495 /* change origin */ 2496 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2497 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2498 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2499 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2500 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2501 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2502 origin_head->ds_dir->dd_origin_txg = 2503 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2504 2505 /* change dd_clone entries */ 2506 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2507 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2508 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2509 VERIFY0(zap_add_int(dp->dp_meta_objset, 2510 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2511 hds->ds_object, tx)); 2512 2513 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2514 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2515 origin_head->ds_object, tx)); 2516 if (dsl_dir_phys(dd)->dd_clones == 0) { 2517 dsl_dir_phys(dd)->dd_clones = 2518 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2519 DMU_OT_NONE, 0, tx); 2520 } 2521 VERIFY0(zap_add_int(dp->dp_meta_objset, 2522 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2523 } 2524 2525 /* move snapshots to this dir */ 2526 for (snap = list_head(&ddpa->shared_snaps); snap; 2527 snap = list_next(&ddpa->shared_snaps, snap)) { 2528 dsl_dataset_t *ds = snap->ds; 2529 2530 /* 2531 * Property callbacks are registered to a particular 2532 * dsl_dir. Since ours is changing, evict the objset 2533 * so that they will be unregistered from the old dsl_dir. 2534 */ 2535 if (ds->ds_objset) { 2536 dmu_objset_evict(ds->ds_objset); 2537 ds->ds_objset = NULL; 2538 } 2539 2540 /* move snap name entry */ 2541 VERIFY0(dsl_dataset_get_snapname(ds)); 2542 VERIFY0(dsl_dataset_snap_remove(origin_head, 2543 ds->ds_snapname, tx, B_TRUE)); 2544 VERIFY0(zap_add(dp->dp_meta_objset, 2545 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2546 8, 1, &ds->ds_object, tx)); 2547 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2548 DD_FIELD_SNAPSHOT_COUNT, tx); 2549 2550 /* change containing dsl_dir */ 2551 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2552 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2553 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2554 ASSERT3P(ds->ds_dir, ==, odd); 2555 dsl_dir_rele(ds->ds_dir, ds); 2556 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2557 NULL, ds, &ds->ds_dir)); 2558 2559 /* move any clone references */ 2560 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2561 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2562 zap_cursor_t zc; 2563 zap_attribute_t za; 2564 2565 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2566 dsl_dataset_phys(ds)->ds_next_clones_obj); 2567 zap_cursor_retrieve(&zc, &za) == 0; 2568 zap_cursor_advance(&zc)) { 2569 dsl_dataset_t *cnds; 2570 uint64_t o; 2571 2572 if (za.za_first_integer == oldnext_obj) { 2573 /* 2574 * We've already moved the 2575 * origin's reference. 2576 */ 2577 continue; 2578 } 2579 2580 VERIFY0(dsl_dataset_hold_obj(dp, 2581 za.za_first_integer, FTAG, &cnds)); 2582 o = dsl_dir_phys(cnds->ds_dir)-> 2583 dd_head_dataset_obj; 2584 2585 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2586 dsl_dir_phys(odd)->dd_clones, o, tx)); 2587 VERIFY0(zap_add_int(dp->dp_meta_objset, 2588 dsl_dir_phys(dd)->dd_clones, o, tx)); 2589 dsl_dataset_rele(cnds, FTAG); 2590 } 2591 zap_cursor_fini(&zc); 2592 } 2593 2594 ASSERT(!dsl_prop_hascb(ds)); 2595 } 2596 2597 /* 2598 * Change space accounting. 2599 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2600 * both be valid, or both be 0 (resulting in delta == 0). This 2601 * is true for each of {clone,origin} independently. 2602 */ 2603 2604 delta = ddpa->cloneusedsnap - 2605 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2606 ASSERT3S(delta, >=, 0); 2607 ASSERT3U(ddpa->used, >=, delta); 2608 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2609 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2610 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2611 2612 delta = ddpa->originusedsnap - 2613 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2614 ASSERT3S(delta, <=, 0); 2615 ASSERT3U(ddpa->used, >=, -delta); 2616 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2617 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2618 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2619 2620 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2621 2622 /* log history record */ 2623 spa_history_log_internal_ds(hds, "promote", tx, ""); 2624 2625 dsl_dir_rele(odd, FTAG); 2626 promote_rele(ddpa, FTAG); 2627 } 2628 2629 /* 2630 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2631 * (exclusive) and last_obj (inclusive). The list will be in reverse 2632 * order (last_obj will be the list_head()). If first_obj == 0, do all 2633 * snapshots back to this dataset's origin. 2634 */ 2635 static int 2636 snaplist_make(dsl_pool_t *dp, 2637 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2638 { 2639 uint64_t obj = last_obj; 2640 2641 list_create(l, sizeof (struct promotenode), 2642 offsetof(struct promotenode, link)); 2643 2644 while (obj != first_obj) { 2645 dsl_dataset_t *ds; 2646 struct promotenode *snap; 2647 int err; 2648 2649 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2650 ASSERT(err != ENOENT); 2651 if (err != 0) 2652 return (err); 2653 2654 if (first_obj == 0) 2655 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2656 2657 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2658 snap->ds = ds; 2659 list_insert_tail(l, snap); 2660 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2661 } 2662 2663 return (0); 2664 } 2665 2666 static int 2667 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2668 { 2669 struct promotenode *snap; 2670 2671 *spacep = 0; 2672 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2673 uint64_t used, comp, uncomp; 2674 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2675 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2676 *spacep += used; 2677 } 2678 return (0); 2679 } 2680 2681 static void 2682 snaplist_destroy(list_t *l, void *tag) 2683 { 2684 struct promotenode *snap; 2685 2686 if (l == NULL || !list_link_active(&l->list_head)) 2687 return; 2688 2689 while ((snap = list_tail(l)) != NULL) { 2690 list_remove(l, snap); 2691 dsl_dataset_rele(snap->ds, tag); 2692 kmem_free(snap, sizeof (*snap)); 2693 } 2694 list_destroy(l); 2695 } 2696 2697 static int 2698 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2699 { 2700 int error; 2701 dsl_dir_t *dd; 2702 struct promotenode *snap; 2703 2704 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2705 &ddpa->ddpa_clone); 2706 if (error != 0) 2707 return (error); 2708 dd = ddpa->ddpa_clone->ds_dir; 2709 2710 if (ddpa->ddpa_clone->ds_is_snapshot || 2711 !dsl_dir_is_clone(dd)) { 2712 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2713 return (SET_ERROR(EINVAL)); 2714 } 2715 2716 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2717 &ddpa->shared_snaps, tag); 2718 if (error != 0) 2719 goto out; 2720 2721 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2722 &ddpa->clone_snaps, tag); 2723 if (error != 0) 2724 goto out; 2725 2726 snap = list_head(&ddpa->shared_snaps); 2727 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2728 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2729 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2730 &ddpa->origin_snaps, tag); 2731 if (error != 0) 2732 goto out; 2733 2734 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2735 error = dsl_dataset_hold_obj(dp, 2736 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2737 tag, &ddpa->origin_origin); 2738 if (error != 0) 2739 goto out; 2740 } 2741 out: 2742 if (error != 0) 2743 promote_rele(ddpa, tag); 2744 return (error); 2745 } 2746 2747 static void 2748 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2749 { 2750 snaplist_destroy(&ddpa->shared_snaps, tag); 2751 snaplist_destroy(&ddpa->clone_snaps, tag); 2752 snaplist_destroy(&ddpa->origin_snaps, tag); 2753 if (ddpa->origin_origin != NULL) 2754 dsl_dataset_rele(ddpa->origin_origin, tag); 2755 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2756 } 2757 2758 /* 2759 * Promote a clone. 2760 * 2761 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2762 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 2763 */ 2764 int 2765 dsl_dataset_promote(const char *name, char *conflsnap) 2766 { 2767 dsl_dataset_promote_arg_t ddpa = { 0 }; 2768 uint64_t numsnaps; 2769 int error; 2770 objset_t *os; 2771 2772 /* 2773 * We will modify space proportional to the number of 2774 * snapshots. Compute numsnaps. 2775 */ 2776 error = dmu_objset_hold(name, FTAG, &os); 2777 if (error != 0) 2778 return (error); 2779 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2780 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2781 &numsnaps); 2782 dmu_objset_rele(os, FTAG); 2783 if (error != 0) 2784 return (error); 2785 2786 ddpa.ddpa_clonename = name; 2787 ddpa.err_ds = conflsnap; 2788 ddpa.cr = CRED(); 2789 2790 return (dsl_sync_task(name, dsl_dataset_promote_check, 2791 dsl_dataset_promote_sync, &ddpa, 2792 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2793 } 2794 2795 int 2796 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2797 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2798 { 2799 /* 2800 * "slack" factor for received datasets with refquota set on them. 2801 * See the bottom of this function for details on its use. 2802 */ 2803 uint64_t refquota_slack = DMU_MAX_ACCESS * spa_asize_inflation; 2804 int64_t unused_refres_delta; 2805 2806 /* they should both be heads */ 2807 if (clone->ds_is_snapshot || 2808 origin_head->ds_is_snapshot) 2809 return (SET_ERROR(EINVAL)); 2810 2811 /* if we are not forcing, the branch point should be just before them */ 2812 if (!force && clone->ds_prev != origin_head->ds_prev) 2813 return (SET_ERROR(EINVAL)); 2814 2815 /* clone should be the clone (unless they are unrelated) */ 2816 if (clone->ds_prev != NULL && 2817 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2818 origin_head->ds_dir != clone->ds_prev->ds_dir) 2819 return (SET_ERROR(EINVAL)); 2820 2821 /* the clone should be a child of the origin */ 2822 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2823 return (SET_ERROR(EINVAL)); 2824 2825 /* origin_head shouldn't be modified unless 'force' */ 2826 if (!force && 2827 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2828 return (SET_ERROR(ETXTBSY)); 2829 2830 /* origin_head should have no long holds (e.g. is not mounted) */ 2831 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2832 return (SET_ERROR(EBUSY)); 2833 2834 /* check amount of any unconsumed refreservation */ 2835 unused_refres_delta = 2836 (int64_t)MIN(origin_head->ds_reserved, 2837 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2838 (int64_t)MIN(origin_head->ds_reserved, 2839 dsl_dataset_phys(clone)->ds_unique_bytes); 2840 2841 if (unused_refres_delta > 0 && 2842 unused_refres_delta > 2843 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2844 return (SET_ERROR(ENOSPC)); 2845 2846 /* 2847 * The clone can't be too much over the head's refquota. 2848 * 2849 * To ensure that the entire refquota can be used, we allow one 2850 * transaction to exceed the the refquota. Therefore, this check 2851 * needs to also allow for the space referenced to be more than the 2852 * refquota. The maximum amount of space that one transaction can use 2853 * on disk is DMU_MAX_ACCESS * spa_asize_inflation. Allowing this 2854 * overage ensures that we are able to receive a filesystem that 2855 * exceeds the refquota on the source system. 2856 * 2857 * So that overage is the refquota_slack we use below. 2858 */ 2859 if (origin_head->ds_quota != 0 && 2860 dsl_dataset_phys(clone)->ds_referenced_bytes > 2861 origin_head->ds_quota + refquota_slack) 2862 return (SET_ERROR(EDQUOT)); 2863 2864 return (0); 2865 } 2866 2867 void 2868 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2869 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2870 { 2871 dsl_pool_t *dp = dmu_tx_pool(tx); 2872 int64_t unused_refres_delta; 2873 2874 ASSERT(clone->ds_reserved == 0); 2875 /* 2876 * NOTE: On DEBUG kernels there could be a race between this and 2877 * the check function if spa_asize_inflation is adjusted... 2878 */ 2879 ASSERT(origin_head->ds_quota == 0 || 2880 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota + 2881 DMU_MAX_ACCESS * spa_asize_inflation); 2882 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2883 2884 /* 2885 * Swap per-dataset feature flags. 2886 */ 2887 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2888 if (!(spa_feature_table[f].fi_flags & 2889 ZFEATURE_FLAG_PER_DATASET)) { 2890 ASSERT(!clone->ds_feature_inuse[f]); 2891 ASSERT(!origin_head->ds_feature_inuse[f]); 2892 continue; 2893 } 2894 2895 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 2896 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 2897 2898 if (clone_inuse) { 2899 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 2900 clone->ds_feature_inuse[f] = B_FALSE; 2901 } 2902 if (origin_head_inuse) { 2903 dsl_dataset_deactivate_feature(origin_head->ds_object, 2904 f, tx); 2905 origin_head->ds_feature_inuse[f] = B_FALSE; 2906 } 2907 if (clone_inuse) { 2908 dsl_dataset_activate_feature(origin_head->ds_object, 2909 f, tx); 2910 origin_head->ds_feature_inuse[f] = B_TRUE; 2911 } 2912 if (origin_head_inuse) { 2913 dsl_dataset_activate_feature(clone->ds_object, f, tx); 2914 clone->ds_feature_inuse[f] = B_TRUE; 2915 } 2916 } 2917 2918 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2919 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2920 2921 if (clone->ds_objset != NULL) { 2922 dmu_objset_evict(clone->ds_objset); 2923 clone->ds_objset = NULL; 2924 } 2925 2926 if (origin_head->ds_objset != NULL) { 2927 dmu_objset_evict(origin_head->ds_objset); 2928 origin_head->ds_objset = NULL; 2929 } 2930 2931 unused_refres_delta = 2932 (int64_t)MIN(origin_head->ds_reserved, 2933 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2934 (int64_t)MIN(origin_head->ds_reserved, 2935 dsl_dataset_phys(clone)->ds_unique_bytes); 2936 2937 /* 2938 * Reset origin's unique bytes, if it exists. 2939 */ 2940 if (clone->ds_prev) { 2941 dsl_dataset_t *origin = clone->ds_prev; 2942 uint64_t comp, uncomp; 2943 2944 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2945 dsl_deadlist_space_range(&clone->ds_deadlist, 2946 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 2947 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 2948 } 2949 2950 /* swap blkptrs */ 2951 { 2952 blkptr_t tmp; 2953 tmp = dsl_dataset_phys(origin_head)->ds_bp; 2954 dsl_dataset_phys(origin_head)->ds_bp = 2955 dsl_dataset_phys(clone)->ds_bp; 2956 dsl_dataset_phys(clone)->ds_bp = tmp; 2957 } 2958 2959 /* set dd_*_bytes */ 2960 { 2961 int64_t dused, dcomp, duncomp; 2962 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2963 uint64_t odl_used, odl_comp, odl_uncomp; 2964 2965 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 2966 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2967 2968 dsl_deadlist_space(&clone->ds_deadlist, 2969 &cdl_used, &cdl_comp, &cdl_uncomp); 2970 dsl_deadlist_space(&origin_head->ds_deadlist, 2971 &odl_used, &odl_comp, &odl_uncomp); 2972 2973 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 2974 cdl_used - 2975 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 2976 odl_used); 2977 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 2978 cdl_comp - 2979 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 2980 odl_comp); 2981 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 2982 cdl_uncomp - 2983 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 2984 odl_uncomp); 2985 2986 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2987 dused, dcomp, duncomp, tx); 2988 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2989 -dused, -dcomp, -duncomp, tx); 2990 2991 /* 2992 * The difference in the space used by snapshots is the 2993 * difference in snapshot space due to the head's 2994 * deadlist (since that's the only thing that's 2995 * changing that affects the snapused). 2996 */ 2997 dsl_deadlist_space_range(&clone->ds_deadlist, 2998 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2999 &cdl_used, &cdl_comp, &cdl_uncomp); 3000 dsl_deadlist_space_range(&origin_head->ds_deadlist, 3001 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 3002 &odl_used, &odl_comp, &odl_uncomp); 3003 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 3004 DD_USED_HEAD, DD_USED_SNAP, tx); 3005 } 3006 3007 /* swap ds_*_bytes */ 3008 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 3009 dsl_dataset_phys(clone)->ds_referenced_bytes); 3010 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 3011 dsl_dataset_phys(clone)->ds_compressed_bytes); 3012 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 3013 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 3014 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 3015 dsl_dataset_phys(clone)->ds_unique_bytes); 3016 3017 /* apply any parent delta for change in unconsumed refreservation */ 3018 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 3019 unused_refres_delta, 0, 0, tx); 3020 3021 /* 3022 * Swap deadlists. 3023 */ 3024 dsl_deadlist_close(&clone->ds_deadlist); 3025 dsl_deadlist_close(&origin_head->ds_deadlist); 3026 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3027 dsl_dataset_phys(clone)->ds_deadlist_obj); 3028 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3029 dsl_dataset_phys(clone)->ds_deadlist_obj); 3030 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3031 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3032 3033 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3034 3035 spa_history_log_internal_ds(clone, "clone swap", tx, 3036 "parent=%s", origin_head->ds_dir->dd_myname); 3037 } 3038 3039 /* 3040 * Given a pool name and a dataset object number in that pool, 3041 * return the name of that dataset. 3042 */ 3043 int 3044 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3045 { 3046 dsl_pool_t *dp; 3047 dsl_dataset_t *ds; 3048 int error; 3049 3050 error = dsl_pool_hold(pname, FTAG, &dp); 3051 if (error != 0) 3052 return (error); 3053 3054 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3055 if (error == 0) { 3056 dsl_dataset_name(ds, buf); 3057 dsl_dataset_rele(ds, FTAG); 3058 } 3059 dsl_pool_rele(dp, FTAG); 3060 3061 return (error); 3062 } 3063 3064 int 3065 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3066 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3067 { 3068 int error = 0; 3069 3070 ASSERT3S(asize, >, 0); 3071 3072 /* 3073 * *ref_rsrv is the portion of asize that will come from any 3074 * unconsumed refreservation space. 3075 */ 3076 *ref_rsrv = 0; 3077 3078 mutex_enter(&ds->ds_lock); 3079 /* 3080 * Make a space adjustment for reserved bytes. 3081 */ 3082 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3083 ASSERT3U(*used, >=, 3084 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3085 *used -= 3086 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3087 *ref_rsrv = 3088 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3089 } 3090 3091 if (!check_quota || ds->ds_quota == 0) { 3092 mutex_exit(&ds->ds_lock); 3093 return (0); 3094 } 3095 /* 3096 * If they are requesting more space, and our current estimate 3097 * is over quota, they get to try again unless the actual 3098 * on-disk is over quota and there are no pending changes (which 3099 * may free up space for us). 3100 */ 3101 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3102 ds->ds_quota) { 3103 if (inflight > 0 || 3104 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3105 error = SET_ERROR(ERESTART); 3106 else 3107 error = SET_ERROR(EDQUOT); 3108 } 3109 mutex_exit(&ds->ds_lock); 3110 3111 return (error); 3112 } 3113 3114 typedef struct dsl_dataset_set_qr_arg { 3115 const char *ddsqra_name; 3116 zprop_source_t ddsqra_source; 3117 uint64_t ddsqra_value; 3118 } dsl_dataset_set_qr_arg_t; 3119 3120 3121 /* ARGSUSED */ 3122 static int 3123 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3124 { 3125 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3126 dsl_pool_t *dp = dmu_tx_pool(tx); 3127 dsl_dataset_t *ds; 3128 int error; 3129 uint64_t newval; 3130 3131 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3132 return (SET_ERROR(ENOTSUP)); 3133 3134 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3135 if (error != 0) 3136 return (error); 3137 3138 if (ds->ds_is_snapshot) { 3139 dsl_dataset_rele(ds, FTAG); 3140 return (SET_ERROR(EINVAL)); 3141 } 3142 3143 error = dsl_prop_predict(ds->ds_dir, 3144 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3145 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3146 if (error != 0) { 3147 dsl_dataset_rele(ds, FTAG); 3148 return (error); 3149 } 3150 3151 if (newval == 0) { 3152 dsl_dataset_rele(ds, FTAG); 3153 return (0); 3154 } 3155 3156 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3157 newval < ds->ds_reserved) { 3158 dsl_dataset_rele(ds, FTAG); 3159 return (SET_ERROR(ENOSPC)); 3160 } 3161 3162 dsl_dataset_rele(ds, FTAG); 3163 return (0); 3164 } 3165 3166 static void 3167 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3168 { 3169 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3170 dsl_pool_t *dp = dmu_tx_pool(tx); 3171 dsl_dataset_t *ds; 3172 uint64_t newval; 3173 3174 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3175 3176 dsl_prop_set_sync_impl(ds, 3177 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3178 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3179 &ddsqra->ddsqra_value, tx); 3180 3181 VERIFY0(dsl_prop_get_int_ds(ds, 3182 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3183 3184 if (ds->ds_quota != newval) { 3185 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3186 ds->ds_quota = newval; 3187 } 3188 dsl_dataset_rele(ds, FTAG); 3189 } 3190 3191 int 3192 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3193 uint64_t refquota) 3194 { 3195 dsl_dataset_set_qr_arg_t ddsqra; 3196 3197 ddsqra.ddsqra_name = dsname; 3198 ddsqra.ddsqra_source = source; 3199 ddsqra.ddsqra_value = refquota; 3200 3201 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3202 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3203 } 3204 3205 static int 3206 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3207 { 3208 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3209 dsl_pool_t *dp = dmu_tx_pool(tx); 3210 dsl_dataset_t *ds; 3211 int error; 3212 uint64_t newval, unique; 3213 3214 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3215 return (SET_ERROR(ENOTSUP)); 3216 3217 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3218 if (error != 0) 3219 return (error); 3220 3221 if (ds->ds_is_snapshot) { 3222 dsl_dataset_rele(ds, FTAG); 3223 return (SET_ERROR(EINVAL)); 3224 } 3225 3226 error = dsl_prop_predict(ds->ds_dir, 3227 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3228 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3229 if (error != 0) { 3230 dsl_dataset_rele(ds, FTAG); 3231 return (error); 3232 } 3233 3234 /* 3235 * If we are doing the preliminary check in open context, the 3236 * space estimates may be inaccurate. 3237 */ 3238 if (!dmu_tx_is_syncing(tx)) { 3239 dsl_dataset_rele(ds, FTAG); 3240 return (0); 3241 } 3242 3243 mutex_enter(&ds->ds_lock); 3244 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3245 dsl_dataset_recalc_head_uniq(ds); 3246 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3247 mutex_exit(&ds->ds_lock); 3248 3249 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3250 uint64_t delta = MAX(unique, newval) - 3251 MAX(unique, ds->ds_reserved); 3252 3253 if (delta > 3254 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3255 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3256 dsl_dataset_rele(ds, FTAG); 3257 return (SET_ERROR(ENOSPC)); 3258 } 3259 } 3260 3261 dsl_dataset_rele(ds, FTAG); 3262 return (0); 3263 } 3264 3265 void 3266 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3267 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3268 { 3269 uint64_t newval; 3270 uint64_t unique; 3271 int64_t delta; 3272 3273 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3274 source, sizeof (value), 1, &value, tx); 3275 3276 VERIFY0(dsl_prop_get_int_ds(ds, 3277 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3278 3279 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3280 mutex_enter(&ds->ds_dir->dd_lock); 3281 mutex_enter(&ds->ds_lock); 3282 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3283 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3284 delta = MAX(0, (int64_t)(newval - unique)) - 3285 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3286 ds->ds_reserved = newval; 3287 mutex_exit(&ds->ds_lock); 3288 3289 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3290 mutex_exit(&ds->ds_dir->dd_lock); 3291 } 3292 3293 static void 3294 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3295 { 3296 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3297 dsl_pool_t *dp = dmu_tx_pool(tx); 3298 dsl_dataset_t *ds; 3299 3300 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3301 dsl_dataset_set_refreservation_sync_impl(ds, 3302 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3303 dsl_dataset_rele(ds, FTAG); 3304 } 3305 3306 int 3307 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3308 uint64_t refreservation) 3309 { 3310 dsl_dataset_set_qr_arg_t ddsqra; 3311 3312 ddsqra.ddsqra_name = dsname; 3313 ddsqra.ddsqra_source = source; 3314 ddsqra.ddsqra_value = refreservation; 3315 3316 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3317 dsl_dataset_set_refreservation_sync, &ddsqra, 3318 0, ZFS_SPACE_CHECK_NONE)); 3319 } 3320 3321 /* 3322 * Return (in *usedp) the amount of space written in new that is not 3323 * present in oldsnap. New may be a snapshot or the head. Old must be 3324 * a snapshot before new, in new's filesystem (or its origin). If not then 3325 * fail and return EINVAL. 3326 * 3327 * The written space is calculated by considering two components: First, we 3328 * ignore any freed space, and calculate the written as new's used space 3329 * minus old's used space. Next, we add in the amount of space that was freed 3330 * between the two snapshots, thus reducing new's used space relative to old's. 3331 * Specifically, this is the space that was born before old->ds_creation_txg, 3332 * and freed before new (ie. on new's deadlist or a previous deadlist). 3333 * 3334 * space freed [---------------------] 3335 * snapshots ---O-------O--------O-------O------ 3336 * oldsnap new 3337 */ 3338 int 3339 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3340 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3341 { 3342 int err = 0; 3343 uint64_t snapobj; 3344 dsl_pool_t *dp = new->ds_dir->dd_pool; 3345 3346 ASSERT(dsl_pool_config_held(dp)); 3347 3348 *usedp = 0; 3349 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3350 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3351 3352 *compp = 0; 3353 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3354 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3355 3356 *uncompp = 0; 3357 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3358 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3359 3360 snapobj = new->ds_object; 3361 while (snapobj != oldsnap->ds_object) { 3362 dsl_dataset_t *snap; 3363 uint64_t used, comp, uncomp; 3364 3365 if (snapobj == new->ds_object) { 3366 snap = new; 3367 } else { 3368 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3369 if (err != 0) 3370 break; 3371 } 3372 3373 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3374 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3375 /* 3376 * The blocks in the deadlist can not be born after 3377 * ds_prev_snap_txg, so get the whole deadlist space, 3378 * which is more efficient (especially for old-format 3379 * deadlists). Unfortunately the deadlist code 3380 * doesn't have enough information to make this 3381 * optimization itself. 3382 */ 3383 dsl_deadlist_space(&snap->ds_deadlist, 3384 &used, &comp, &uncomp); 3385 } else { 3386 dsl_deadlist_space_range(&snap->ds_deadlist, 3387 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3388 &used, &comp, &uncomp); 3389 } 3390 *usedp += used; 3391 *compp += comp; 3392 *uncompp += uncomp; 3393 3394 /* 3395 * If we get to the beginning of the chain of snapshots 3396 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3397 * was not a snapshot of/before new. 3398 */ 3399 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3400 if (snap != new) 3401 dsl_dataset_rele(snap, FTAG); 3402 if (snapobj == 0) { 3403 err = SET_ERROR(EINVAL); 3404 break; 3405 } 3406 3407 } 3408 return (err); 3409 } 3410 3411 /* 3412 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3413 * lastsnap, and all snapshots in between are deleted. 3414 * 3415 * blocks that would be freed [---------------------------] 3416 * snapshots ---O-------O--------O-------O--------O 3417 * firstsnap lastsnap 3418 * 3419 * This is the set of blocks that were born after the snap before firstsnap, 3420 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3421 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3422 * We calculate this by iterating over the relevant deadlists (from the snap 3423 * after lastsnap, backward to the snap after firstsnap), summing up the 3424 * space on the deadlist that was born after the snap before firstsnap. 3425 */ 3426 int 3427 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3428 dsl_dataset_t *lastsnap, 3429 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3430 { 3431 int err = 0; 3432 uint64_t snapobj; 3433 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3434 3435 ASSERT(firstsnap->ds_is_snapshot); 3436 ASSERT(lastsnap->ds_is_snapshot); 3437 3438 /* 3439 * Check that the snapshots are in the same dsl_dir, and firstsnap 3440 * is before lastsnap. 3441 */ 3442 if (firstsnap->ds_dir != lastsnap->ds_dir || 3443 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3444 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3445 return (SET_ERROR(EINVAL)); 3446 3447 *usedp = *compp = *uncompp = 0; 3448 3449 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3450 while (snapobj != firstsnap->ds_object) { 3451 dsl_dataset_t *ds; 3452 uint64_t used, comp, uncomp; 3453 3454 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3455 if (err != 0) 3456 break; 3457 3458 dsl_deadlist_space_range(&ds->ds_deadlist, 3459 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3460 &used, &comp, &uncomp); 3461 *usedp += used; 3462 *compp += comp; 3463 *uncompp += uncomp; 3464 3465 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3466 ASSERT3U(snapobj, !=, 0); 3467 dsl_dataset_rele(ds, FTAG); 3468 } 3469 return (err); 3470 } 3471 3472 /* 3473 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3474 * For example, they could both be snapshots of the same filesystem, and 3475 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3476 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3477 * filesystem. Or 'earlier' could be the origin's origin. 3478 * 3479 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3480 */ 3481 boolean_t 3482 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3483 uint64_t earlier_txg) 3484 { 3485 dsl_pool_t *dp = later->ds_dir->dd_pool; 3486 int error; 3487 boolean_t ret; 3488 3489 ASSERT(dsl_pool_config_held(dp)); 3490 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3491 3492 if (earlier_txg == 0) 3493 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3494 3495 if (later->ds_is_snapshot && 3496 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3497 return (B_FALSE); 3498 3499 if (later->ds_dir == earlier->ds_dir) 3500 return (B_TRUE); 3501 if (!dsl_dir_is_clone(later->ds_dir)) 3502 return (B_FALSE); 3503 3504 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3505 return (B_TRUE); 3506 dsl_dataset_t *origin; 3507 error = dsl_dataset_hold_obj(dp, 3508 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3509 if (error != 0) 3510 return (B_FALSE); 3511 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3512 dsl_dataset_rele(origin, FTAG); 3513 return (ret); 3514 } 3515 3516 void 3517 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3518 { 3519 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3520 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3521 } 3522 3523 boolean_t 3524 dsl_dataset_is_zapified(dsl_dataset_t *ds) 3525 { 3526 dmu_object_info_t doi; 3527 3528 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3529 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3530 } 3531 3532 boolean_t 3533 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3534 { 3535 return (dsl_dataset_is_zapified(ds) && 3536 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3537 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3538 } 3539