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 */ 28 29 #include <sys/dmu_objset.h> 30 #include <sys/dsl_dataset.h> 31 #include <sys/dsl_dir.h> 32 #include <sys/dsl_prop.h> 33 #include <sys/dsl_synctask.h> 34 #include <sys/dmu_traverse.h> 35 #include <sys/dmu_impl.h> 36 #include <sys/dmu_tx.h> 37 #include <sys/arc.h> 38 #include <sys/zio.h> 39 #include <sys/zap.h> 40 #include <sys/zfeature.h> 41 #include <sys/unique.h> 42 #include <sys/zfs_context.h> 43 #include <sys/zfs_ioctl.h> 44 #include <sys/spa.h> 45 #include <sys/zfs_znode.h> 46 #include <sys/zfs_onexit.h> 47 #include <sys/zvol.h> 48 #include <sys/dsl_scan.h> 49 #include <sys/dsl_deadlist.h> 50 #include <sys/dsl_destroy.h> 51 #include <sys/dsl_userhold.h> 52 #include <sys/dsl_bookmark.h> 53 #include <sys/dmu_send.h> 54 #include <sys/zio_checksum.h> 55 #include <sys/zio_compress.h> 56 #include <zfs_fletcher.h> 57 58 /* 59 * The SPA supports block sizes up to 16MB. However, very large blocks 60 * can have an impact on i/o latency (e.g. tying up a spinning disk for 61 * ~300ms), and also potentially on the memory allocator. Therefore, 62 * we do not allow the recordsize to be set larger than zfs_max_recordsize 63 * (default 1MB). Larger blocks can be created by changing this tunable, 64 * and pools with larger blocks can always be imported and used, regardless 65 * of this setting. 66 */ 67 int zfs_max_recordsize = 1 * 1024 * 1024; 68 69 #define SWITCH64(x, y) \ 70 { \ 71 uint64_t __tmp = (x); \ 72 (x) = (y); \ 73 (y) = __tmp; \ 74 } 75 76 #define DS_REF_MAX (1ULL << 62) 77 78 extern inline dsl_dataset_phys_t *dsl_dataset_phys(dsl_dataset_t *ds); 79 80 /* 81 * Figure out how much of this delta should be propogated to the dsl_dir 82 * layer. If there's a refreservation, that space has already been 83 * partially accounted for in our ancestors. 84 */ 85 static int64_t 86 parent_delta(dsl_dataset_t *ds, int64_t delta) 87 { 88 dsl_dataset_phys_t *ds_phys; 89 uint64_t old_bytes, new_bytes; 90 91 if (ds->ds_reserved == 0) 92 return (delta); 93 94 ds_phys = dsl_dataset_phys(ds); 95 old_bytes = MAX(ds_phys->ds_unique_bytes, ds->ds_reserved); 96 new_bytes = MAX(ds_phys->ds_unique_bytes + delta, ds->ds_reserved); 97 98 ASSERT3U(ABS((int64_t)(new_bytes - old_bytes)), <=, ABS(delta)); 99 return (new_bytes - old_bytes); 100 } 101 102 void 103 dsl_dataset_block_born(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx) 104 { 105 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 106 int compressed = BP_GET_PSIZE(bp); 107 int uncompressed = BP_GET_UCSIZE(bp); 108 int64_t delta; 109 110 dprintf_bp(bp, "ds=%p", ds); 111 112 ASSERT(dmu_tx_is_syncing(tx)); 113 /* It could have been compressed away to nothing */ 114 if (BP_IS_HOLE(bp)) 115 return; 116 ASSERT(BP_GET_TYPE(bp) != DMU_OT_NONE); 117 ASSERT(DMU_OT_IS_VALID(BP_GET_TYPE(bp))); 118 if (ds == NULL) { 119 dsl_pool_mos_diduse_space(tx->tx_pool, 120 used, compressed, uncompressed); 121 return; 122 } 123 124 dmu_buf_will_dirty(ds->ds_dbuf, tx); 125 mutex_enter(&ds->ds_lock); 126 delta = parent_delta(ds, used); 127 dsl_dataset_phys(ds)->ds_referenced_bytes += used; 128 dsl_dataset_phys(ds)->ds_compressed_bytes += compressed; 129 dsl_dataset_phys(ds)->ds_uncompressed_bytes += uncompressed; 130 dsl_dataset_phys(ds)->ds_unique_bytes += used; 131 if (BP_GET_LSIZE(bp) > SPA_OLD_MAXBLOCKSIZE) { 132 ds->ds_feature_activation_needed[SPA_FEATURE_LARGE_BLOCKS] = 133 B_TRUE; 134 } 135 mutex_exit(&ds->ds_lock); 136 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, delta, 137 compressed, uncompressed, tx); 138 dsl_dir_transfer_space(ds->ds_dir, used - delta, 139 DD_USED_REFRSRV, DD_USED_HEAD, tx); 140 } 141 142 int 143 dsl_dataset_block_kill(dsl_dataset_t *ds, const blkptr_t *bp, dmu_tx_t *tx, 144 boolean_t async) 145 { 146 int used = bp_get_dsize_sync(tx->tx_pool->dp_spa, bp); 147 int compressed = BP_GET_PSIZE(bp); 148 int uncompressed = BP_GET_UCSIZE(bp); 149 150 if (BP_IS_HOLE(bp)) 151 return (0); 152 153 ASSERT(dmu_tx_is_syncing(tx)); 154 ASSERT(bp->blk_birth <= tx->tx_txg); 155 156 if (ds == NULL) { 157 dsl_free(tx->tx_pool, tx->tx_txg, bp); 158 dsl_pool_mos_diduse_space(tx->tx_pool, 159 -used, -compressed, -uncompressed); 160 return (used); 161 } 162 ASSERT3P(tx->tx_pool, ==, ds->ds_dir->dd_pool); 163 164 ASSERT(!ds->ds_is_snapshot); 165 dmu_buf_will_dirty(ds->ds_dbuf, tx); 166 167 if (bp->blk_birth > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 168 int64_t delta; 169 170 dprintf_bp(bp, "freeing ds=%llu", ds->ds_object); 171 dsl_free(tx->tx_pool, tx->tx_txg, bp); 172 173 mutex_enter(&ds->ds_lock); 174 ASSERT(dsl_dataset_phys(ds)->ds_unique_bytes >= used || 175 !DS_UNIQUE_IS_ACCURATE(ds)); 176 delta = parent_delta(ds, -used); 177 dsl_dataset_phys(ds)->ds_unique_bytes -= used; 178 mutex_exit(&ds->ds_lock); 179 dsl_dir_diduse_space(ds->ds_dir, DD_USED_HEAD, 180 delta, -compressed, -uncompressed, tx); 181 dsl_dir_transfer_space(ds->ds_dir, -used - delta, 182 DD_USED_REFRSRV, DD_USED_HEAD, tx); 183 } else { 184 dprintf_bp(bp, "putting on dead list: %s", ""); 185 if (async) { 186 /* 187 * We are here as part of zio's write done callback, 188 * which means we're a zio interrupt thread. We can't 189 * call dsl_deadlist_insert() now because it may block 190 * waiting for I/O. Instead, put bp on the deferred 191 * queue and let dsl_pool_sync() finish the job. 192 */ 193 bplist_append(&ds->ds_pending_deadlist, bp); 194 } else { 195 dsl_deadlist_insert(&ds->ds_deadlist, bp, tx); 196 } 197 ASSERT3U(ds->ds_prev->ds_object, ==, 198 dsl_dataset_phys(ds)->ds_prev_snap_obj); 199 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_num_children > 0); 200 /* if (bp->blk_birth > prev prev snap txg) prev unique += bs */ 201 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 202 ds->ds_object && bp->blk_birth > 203 dsl_dataset_phys(ds->ds_prev)->ds_prev_snap_txg) { 204 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 205 mutex_enter(&ds->ds_prev->ds_lock); 206 dsl_dataset_phys(ds->ds_prev)->ds_unique_bytes += used; 207 mutex_exit(&ds->ds_prev->ds_lock); 208 } 209 if (bp->blk_birth > ds->ds_dir->dd_origin_txg) { 210 dsl_dir_transfer_space(ds->ds_dir, used, 211 DD_USED_HEAD, DD_USED_SNAP, tx); 212 } 213 } 214 mutex_enter(&ds->ds_lock); 215 ASSERT3U(dsl_dataset_phys(ds)->ds_referenced_bytes, >=, used); 216 dsl_dataset_phys(ds)->ds_referenced_bytes -= used; 217 ASSERT3U(dsl_dataset_phys(ds)->ds_compressed_bytes, >=, compressed); 218 dsl_dataset_phys(ds)->ds_compressed_bytes -= compressed; 219 ASSERT3U(dsl_dataset_phys(ds)->ds_uncompressed_bytes, >=, uncompressed); 220 dsl_dataset_phys(ds)->ds_uncompressed_bytes -= uncompressed; 221 mutex_exit(&ds->ds_lock); 222 223 return (used); 224 } 225 226 uint64_t 227 dsl_dataset_prev_snap_txg(dsl_dataset_t *ds) 228 { 229 uint64_t trysnap = 0; 230 231 if (ds == NULL) 232 return (0); 233 /* 234 * The snapshot creation could fail, but that would cause an 235 * incorrect FALSE return, which would only result in an 236 * overestimation of the amount of space that an operation would 237 * consume, which is OK. 238 * 239 * There's also a small window where we could miss a pending 240 * snapshot, because we could set the sync task in the quiescing 241 * phase. So this should only be used as a guess. 242 */ 243 if (ds->ds_trysnap_txg > 244 spa_last_synced_txg(ds->ds_dir->dd_pool->dp_spa)) 245 trysnap = ds->ds_trysnap_txg; 246 return (MAX(dsl_dataset_phys(ds)->ds_prev_snap_txg, trysnap)); 247 } 248 249 boolean_t 250 dsl_dataset_block_freeable(dsl_dataset_t *ds, const blkptr_t *bp, 251 uint64_t blk_birth) 252 { 253 if (blk_birth <= dsl_dataset_prev_snap_txg(ds) || 254 (bp != NULL && BP_IS_HOLE(bp))) 255 return (B_FALSE); 256 257 ddt_prefetch(dsl_dataset_get_spa(ds), bp); 258 259 return (B_TRUE); 260 } 261 262 static void 263 dsl_dataset_evict(void *dbu) 264 { 265 dsl_dataset_t *ds = dbu; 266 267 ASSERT(ds->ds_owner == NULL); 268 269 ds->ds_dbuf = NULL; 270 271 unique_remove(ds->ds_fsid_guid); 272 273 if (ds->ds_objset != NULL) 274 dmu_objset_evict(ds->ds_objset); 275 276 if (ds->ds_prev) { 277 dsl_dataset_rele(ds->ds_prev, ds); 278 ds->ds_prev = NULL; 279 } 280 281 bplist_destroy(&ds->ds_pending_deadlist); 282 if (ds->ds_deadlist.dl_os != NULL) 283 dsl_deadlist_close(&ds->ds_deadlist); 284 if (ds->ds_dir) 285 dsl_dir_async_rele(ds->ds_dir, ds); 286 287 ASSERT(!list_link_active(&ds->ds_synced_link)); 288 289 mutex_destroy(&ds->ds_lock); 290 mutex_destroy(&ds->ds_opening_lock); 291 mutex_destroy(&ds->ds_sendstream_lock); 292 refcount_destroy(&ds->ds_longholds); 293 294 kmem_free(ds, sizeof (dsl_dataset_t)); 295 } 296 297 int 298 dsl_dataset_get_snapname(dsl_dataset_t *ds) 299 { 300 dsl_dataset_phys_t *headphys; 301 int err; 302 dmu_buf_t *headdbuf; 303 dsl_pool_t *dp = ds->ds_dir->dd_pool; 304 objset_t *mos = dp->dp_meta_objset; 305 306 if (ds->ds_snapname[0]) 307 return (0); 308 if (dsl_dataset_phys(ds)->ds_next_snap_obj == 0) 309 return (0); 310 311 err = dmu_bonus_hold(mos, dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj, 312 FTAG, &headdbuf); 313 if (err != 0) 314 return (err); 315 headphys = headdbuf->db_data; 316 err = zap_value_search(dp->dp_meta_objset, 317 headphys->ds_snapnames_zapobj, ds->ds_object, 0, ds->ds_snapname); 318 dmu_buf_rele(headdbuf, FTAG); 319 return (err); 320 } 321 322 int 323 dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name, uint64_t *value) 324 { 325 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 326 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 327 matchtype_t mt; 328 int err; 329 330 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 331 mt = MT_FIRST; 332 else 333 mt = MT_EXACT; 334 335 err = zap_lookup_norm(mos, snapobj, name, 8, 1, 336 value, mt, NULL, 0, NULL); 337 if (err == ENOTSUP && mt == MT_FIRST) 338 err = zap_lookup(mos, snapobj, name, 8, 1, value); 339 return (err); 340 } 341 342 int 343 dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx, 344 boolean_t adj_cnt) 345 { 346 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 347 uint64_t snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 348 matchtype_t mt; 349 int err; 350 351 dsl_dir_snap_cmtime_update(ds->ds_dir); 352 353 if (dsl_dataset_phys(ds)->ds_flags & DS_FLAG_CI_DATASET) 354 mt = MT_FIRST; 355 else 356 mt = MT_EXACT; 357 358 err = zap_remove_norm(mos, snapobj, name, mt, tx); 359 if (err == ENOTSUP && mt == MT_FIRST) 360 err = zap_remove(mos, snapobj, name, tx); 361 362 if (err == 0 && adj_cnt) 363 dsl_fs_ss_count_adjust(ds->ds_dir, -1, 364 DD_FIELD_SNAPSHOT_COUNT, tx); 365 366 return (err); 367 } 368 369 boolean_t 370 dsl_dataset_try_add_ref(dsl_pool_t *dp, dsl_dataset_t *ds, void *tag) 371 { 372 dmu_buf_t *dbuf = ds->ds_dbuf; 373 boolean_t result = B_FALSE; 374 375 if (dbuf != NULL && dmu_buf_try_add_ref(dbuf, dp->dp_meta_objset, 376 ds->ds_object, DMU_BONUS_BLKID, tag)) { 377 378 if (ds == dmu_buf_get_user(dbuf)) 379 result = B_TRUE; 380 else 381 dmu_buf_rele(dbuf, tag); 382 } 383 384 return (result); 385 } 386 387 int 388 dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag, 389 dsl_dataset_t **dsp) 390 { 391 objset_t *mos = dp->dp_meta_objset; 392 dmu_buf_t *dbuf; 393 dsl_dataset_t *ds; 394 int err; 395 dmu_object_info_t doi; 396 397 ASSERT(dsl_pool_config_held(dp)); 398 399 err = dmu_bonus_hold(mos, dsobj, tag, &dbuf); 400 if (err != 0) 401 return (err); 402 403 /* Make sure dsobj has the correct object type. */ 404 dmu_object_info_from_db(dbuf, &doi); 405 if (doi.doi_bonus_type != DMU_OT_DSL_DATASET) { 406 dmu_buf_rele(dbuf, tag); 407 return (SET_ERROR(EINVAL)); 408 } 409 410 ds = dmu_buf_get_user(dbuf); 411 if (ds == NULL) { 412 dsl_dataset_t *winner = NULL; 413 414 ds = kmem_zalloc(sizeof (dsl_dataset_t), KM_SLEEP); 415 ds->ds_dbuf = dbuf; 416 ds->ds_object = dsobj; 417 ds->ds_is_snapshot = dsl_dataset_phys(ds)->ds_num_children != 0; 418 419 mutex_init(&ds->ds_lock, NULL, MUTEX_DEFAULT, NULL); 420 mutex_init(&ds->ds_opening_lock, NULL, MUTEX_DEFAULT, NULL); 421 mutex_init(&ds->ds_sendstream_lock, NULL, MUTEX_DEFAULT, NULL); 422 refcount_create(&ds->ds_longholds); 423 424 bplist_create(&ds->ds_pending_deadlist); 425 dsl_deadlist_open(&ds->ds_deadlist, 426 mos, dsl_dataset_phys(ds)->ds_deadlist_obj); 427 428 list_create(&ds->ds_sendstreams, sizeof (dmu_sendarg_t), 429 offsetof(dmu_sendarg_t, dsa_link)); 430 431 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 432 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 433 if (!(spa_feature_table[f].fi_flags & 434 ZFEATURE_FLAG_PER_DATASET)) 435 continue; 436 err = zap_contains(mos, dsobj, 437 spa_feature_table[f].fi_guid); 438 if (err == 0) { 439 ds->ds_feature_inuse[f] = B_TRUE; 440 } else { 441 ASSERT3U(err, ==, ENOENT); 442 err = 0; 443 } 444 } 445 } 446 447 err = dsl_dir_hold_obj(dp, 448 dsl_dataset_phys(ds)->ds_dir_obj, NULL, ds, &ds->ds_dir); 449 if (err != 0) { 450 mutex_destroy(&ds->ds_lock); 451 mutex_destroy(&ds->ds_opening_lock); 452 mutex_destroy(&ds->ds_sendstream_lock); 453 refcount_destroy(&ds->ds_longholds); 454 bplist_destroy(&ds->ds_pending_deadlist); 455 dsl_deadlist_close(&ds->ds_deadlist); 456 kmem_free(ds, sizeof (dsl_dataset_t)); 457 dmu_buf_rele(dbuf, tag); 458 return (err); 459 } 460 461 if (!ds->ds_is_snapshot) { 462 ds->ds_snapname[0] = '\0'; 463 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 464 err = dsl_dataset_hold_obj(dp, 465 dsl_dataset_phys(ds)->ds_prev_snap_obj, 466 ds, &ds->ds_prev); 467 } 468 if (doi.doi_type == DMU_OTN_ZAP_METADATA) { 469 int zaperr = zap_lookup(mos, ds->ds_object, 470 DS_FIELD_BOOKMARK_NAMES, 471 sizeof (ds->ds_bookmarks), 1, 472 &ds->ds_bookmarks); 473 if (zaperr != ENOENT) 474 VERIFY0(zaperr); 475 } 476 } else { 477 if (zfs_flags & ZFS_DEBUG_SNAPNAMES) 478 err = dsl_dataset_get_snapname(ds); 479 if (err == 0 && 480 dsl_dataset_phys(ds)->ds_userrefs_obj != 0) { 481 err = zap_count( 482 ds->ds_dir->dd_pool->dp_meta_objset, 483 dsl_dataset_phys(ds)->ds_userrefs_obj, 484 &ds->ds_userrefs); 485 } 486 } 487 488 if (err == 0 && !ds->ds_is_snapshot) { 489 err = dsl_prop_get_int_ds(ds, 490 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 491 &ds->ds_reserved); 492 if (err == 0) { 493 err = dsl_prop_get_int_ds(ds, 494 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 495 &ds->ds_quota); 496 } 497 } else { 498 ds->ds_reserved = ds->ds_quota = 0; 499 } 500 501 dmu_buf_init_user(&ds->ds_dbu, dsl_dataset_evict, &ds->ds_dbuf); 502 if (err == 0) 503 winner = dmu_buf_set_user_ie(dbuf, &ds->ds_dbu); 504 505 if (err != 0 || winner != NULL) { 506 bplist_destroy(&ds->ds_pending_deadlist); 507 dsl_deadlist_close(&ds->ds_deadlist); 508 if (ds->ds_prev) 509 dsl_dataset_rele(ds->ds_prev, ds); 510 dsl_dir_rele(ds->ds_dir, ds); 511 mutex_destroy(&ds->ds_lock); 512 mutex_destroy(&ds->ds_opening_lock); 513 mutex_destroy(&ds->ds_sendstream_lock); 514 refcount_destroy(&ds->ds_longholds); 515 kmem_free(ds, sizeof (dsl_dataset_t)); 516 if (err != 0) { 517 dmu_buf_rele(dbuf, tag); 518 return (err); 519 } 520 ds = winner; 521 } else { 522 ds->ds_fsid_guid = 523 unique_insert(dsl_dataset_phys(ds)->ds_fsid_guid); 524 } 525 } 526 ASSERT3P(ds->ds_dbuf, ==, dbuf); 527 ASSERT3P(dsl_dataset_phys(ds), ==, dbuf->db_data); 528 ASSERT(dsl_dataset_phys(ds)->ds_prev_snap_obj != 0 || 529 spa_version(dp->dp_spa) < SPA_VERSION_ORIGIN || 530 dp->dp_origin_snap == NULL || ds == dp->dp_origin_snap); 531 *dsp = ds; 532 return (0); 533 } 534 535 int 536 dsl_dataset_hold(dsl_pool_t *dp, const char *name, 537 void *tag, dsl_dataset_t **dsp) 538 { 539 dsl_dir_t *dd; 540 const char *snapname; 541 uint64_t obj; 542 int err = 0; 543 dsl_dataset_t *ds; 544 545 err = dsl_dir_hold(dp, name, FTAG, &dd, &snapname); 546 if (err != 0) 547 return (err); 548 549 ASSERT(dsl_pool_config_held(dp)); 550 obj = dsl_dir_phys(dd)->dd_head_dataset_obj; 551 if (obj != 0) 552 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 553 else 554 err = SET_ERROR(ENOENT); 555 556 /* we may be looking for a snapshot */ 557 if (err == 0 && snapname != NULL) { 558 dsl_dataset_t *snap_ds; 559 560 if (*snapname++ != '@') { 561 dsl_dataset_rele(ds, tag); 562 dsl_dir_rele(dd, FTAG); 563 return (SET_ERROR(ENOENT)); 564 } 565 566 dprintf("looking for snapshot '%s'\n", snapname); 567 err = dsl_dataset_snap_lookup(ds, snapname, &obj); 568 if (err == 0) 569 err = dsl_dataset_hold_obj(dp, obj, tag, &snap_ds); 570 dsl_dataset_rele(ds, tag); 571 572 if (err == 0) { 573 mutex_enter(&snap_ds->ds_lock); 574 if (snap_ds->ds_snapname[0] == 0) 575 (void) strlcpy(snap_ds->ds_snapname, snapname, 576 sizeof (snap_ds->ds_snapname)); 577 mutex_exit(&snap_ds->ds_lock); 578 ds = snap_ds; 579 } 580 } 581 if (err == 0) 582 *dsp = ds; 583 dsl_dir_rele(dd, FTAG); 584 return (err); 585 } 586 587 int 588 dsl_dataset_own_obj(dsl_pool_t *dp, uint64_t dsobj, 589 void *tag, dsl_dataset_t **dsp) 590 { 591 int err = dsl_dataset_hold_obj(dp, dsobj, tag, dsp); 592 if (err != 0) 593 return (err); 594 if (!dsl_dataset_tryown(*dsp, tag)) { 595 dsl_dataset_rele(*dsp, tag); 596 *dsp = NULL; 597 return (SET_ERROR(EBUSY)); 598 } 599 return (0); 600 } 601 602 int 603 dsl_dataset_own(dsl_pool_t *dp, const char *name, 604 void *tag, dsl_dataset_t **dsp) 605 { 606 int err = dsl_dataset_hold(dp, name, tag, dsp); 607 if (err != 0) 608 return (err); 609 if (!dsl_dataset_tryown(*dsp, tag)) { 610 dsl_dataset_rele(*dsp, tag); 611 return (SET_ERROR(EBUSY)); 612 } 613 return (0); 614 } 615 616 /* 617 * See the comment above dsl_pool_hold() for details. In summary, a long 618 * hold is used to prevent destruction of a dataset while the pool hold 619 * is dropped, allowing other concurrent operations (e.g. spa_sync()). 620 * 621 * The dataset and pool must be held when this function is called. After it 622 * is called, the pool hold may be released while the dataset is still held 623 * and accessed. 624 */ 625 void 626 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag) 627 { 628 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 629 (void) refcount_add(&ds->ds_longholds, tag); 630 } 631 632 void 633 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag) 634 { 635 (void) refcount_remove(&ds->ds_longholds, tag); 636 } 637 638 /* Return B_TRUE if there are any long holds on this dataset. */ 639 boolean_t 640 dsl_dataset_long_held(dsl_dataset_t *ds) 641 { 642 return (!refcount_is_zero(&ds->ds_longholds)); 643 } 644 645 void 646 dsl_dataset_name(dsl_dataset_t *ds, char *name) 647 { 648 if (ds == NULL) { 649 (void) strcpy(name, "mos"); 650 } else { 651 dsl_dir_name(ds->ds_dir, name); 652 VERIFY0(dsl_dataset_get_snapname(ds)); 653 if (ds->ds_snapname[0]) { 654 VERIFY3U(strlcat(name, "@", ZFS_MAX_DATASET_NAME_LEN), 655 <, ZFS_MAX_DATASET_NAME_LEN); 656 /* 657 * We use a "recursive" mutex so that we 658 * can call dprintf_ds() with ds_lock held. 659 */ 660 if (!MUTEX_HELD(&ds->ds_lock)) { 661 mutex_enter(&ds->ds_lock); 662 VERIFY3U(strlcat(name, ds->ds_snapname, 663 ZFS_MAX_DATASET_NAME_LEN), <, 664 ZFS_MAX_DATASET_NAME_LEN); 665 mutex_exit(&ds->ds_lock); 666 } else { 667 VERIFY3U(strlcat(name, ds->ds_snapname, 668 ZFS_MAX_DATASET_NAME_LEN), <, 669 ZFS_MAX_DATASET_NAME_LEN); 670 } 671 } 672 } 673 } 674 675 int 676 dsl_dataset_namelen(dsl_dataset_t *ds) 677 { 678 VERIFY0(dsl_dataset_get_snapname(ds)); 679 mutex_enter(&ds->ds_lock); 680 int len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname); 681 mutex_exit(&ds->ds_lock); 682 return (len); 683 } 684 685 void 686 dsl_dataset_rele(dsl_dataset_t *ds, void *tag) 687 { 688 dmu_buf_rele(ds->ds_dbuf, tag); 689 } 690 691 void 692 dsl_dataset_disown(dsl_dataset_t *ds, void *tag) 693 { 694 ASSERT3P(ds->ds_owner, ==, tag); 695 ASSERT(ds->ds_dbuf != NULL); 696 697 mutex_enter(&ds->ds_lock); 698 ds->ds_owner = NULL; 699 mutex_exit(&ds->ds_lock); 700 dsl_dataset_long_rele(ds, tag); 701 dsl_dataset_rele(ds, tag); 702 } 703 704 boolean_t 705 dsl_dataset_tryown(dsl_dataset_t *ds, void *tag) 706 { 707 boolean_t gotit = FALSE; 708 709 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 710 mutex_enter(&ds->ds_lock); 711 if (ds->ds_owner == NULL && !DS_IS_INCONSISTENT(ds)) { 712 ds->ds_owner = tag; 713 dsl_dataset_long_hold(ds, tag); 714 gotit = TRUE; 715 } 716 mutex_exit(&ds->ds_lock); 717 return (gotit); 718 } 719 720 boolean_t 721 dsl_dataset_has_owner(dsl_dataset_t *ds) 722 { 723 boolean_t rv; 724 mutex_enter(&ds->ds_lock); 725 rv = (ds->ds_owner != NULL); 726 mutex_exit(&ds->ds_lock); 727 return (rv); 728 } 729 730 static void 731 dsl_dataset_activate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 732 { 733 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 734 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 735 uint64_t zero = 0; 736 737 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 738 739 spa_feature_incr(spa, f, tx); 740 dmu_object_zapify(mos, dsobj, DMU_OT_DSL_DATASET, tx); 741 742 VERIFY0(zap_add(mos, dsobj, spa_feature_table[f].fi_guid, 743 sizeof (zero), 1, &zero, tx)); 744 } 745 746 void 747 dsl_dataset_deactivate_feature(uint64_t dsobj, spa_feature_t f, dmu_tx_t *tx) 748 { 749 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 750 objset_t *mos = dmu_tx_pool(tx)->dp_meta_objset; 751 752 VERIFY(spa_feature_table[f].fi_flags & ZFEATURE_FLAG_PER_DATASET); 753 754 VERIFY0(zap_remove(mos, dsobj, spa_feature_table[f].fi_guid, tx)); 755 spa_feature_decr(spa, f, tx); 756 } 757 758 uint64_t 759 dsl_dataset_create_sync_dd(dsl_dir_t *dd, dsl_dataset_t *origin, 760 uint64_t flags, dmu_tx_t *tx) 761 { 762 dsl_pool_t *dp = dd->dd_pool; 763 dmu_buf_t *dbuf; 764 dsl_dataset_phys_t *dsphys; 765 uint64_t dsobj; 766 objset_t *mos = dp->dp_meta_objset; 767 768 if (origin == NULL) 769 origin = dp->dp_origin_snap; 770 771 ASSERT(origin == NULL || origin->ds_dir->dd_pool == dp); 772 ASSERT(origin == NULL || dsl_dataset_phys(origin)->ds_num_children > 0); 773 ASSERT(dmu_tx_is_syncing(tx)); 774 ASSERT(dsl_dir_phys(dd)->dd_head_dataset_obj == 0); 775 776 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 777 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 778 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 779 dmu_buf_will_dirty(dbuf, tx); 780 dsphys = dbuf->db_data; 781 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 782 dsphys->ds_dir_obj = dd->dd_object; 783 dsphys->ds_flags = flags; 784 dsphys->ds_fsid_guid = unique_create(); 785 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 786 sizeof (dsphys->ds_guid)); 787 dsphys->ds_snapnames_zapobj = 788 zap_create_norm(mos, U8_TEXTPREP_TOUPPER, DMU_OT_DSL_DS_SNAP_MAP, 789 DMU_OT_NONE, 0, tx); 790 dsphys->ds_creation_time = gethrestime_sec(); 791 dsphys->ds_creation_txg = tx->tx_txg == TXG_INITIAL ? 1 : tx->tx_txg; 792 793 if (origin == NULL) { 794 dsphys->ds_deadlist_obj = dsl_deadlist_alloc(mos, tx); 795 } else { 796 dsl_dataset_t *ohds; /* head of the origin snapshot */ 797 798 dsphys->ds_prev_snap_obj = origin->ds_object; 799 dsphys->ds_prev_snap_txg = 800 dsl_dataset_phys(origin)->ds_creation_txg; 801 dsphys->ds_referenced_bytes = 802 dsl_dataset_phys(origin)->ds_referenced_bytes; 803 dsphys->ds_compressed_bytes = 804 dsl_dataset_phys(origin)->ds_compressed_bytes; 805 dsphys->ds_uncompressed_bytes = 806 dsl_dataset_phys(origin)->ds_uncompressed_bytes; 807 dsphys->ds_bp = dsl_dataset_phys(origin)->ds_bp; 808 809 /* 810 * Inherit flags that describe the dataset's contents 811 * (INCONSISTENT) or properties (Case Insensitive). 812 */ 813 dsphys->ds_flags |= dsl_dataset_phys(origin)->ds_flags & 814 (DS_FLAG_INCONSISTENT | DS_FLAG_CI_DATASET); 815 816 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 817 if (origin->ds_feature_inuse[f]) 818 dsl_dataset_activate_feature(dsobj, f, tx); 819 } 820 821 dmu_buf_will_dirty(origin->ds_dbuf, tx); 822 dsl_dataset_phys(origin)->ds_num_children++; 823 824 VERIFY0(dsl_dataset_hold_obj(dp, 825 dsl_dir_phys(origin->ds_dir)->dd_head_dataset_obj, 826 FTAG, &ohds)); 827 dsphys->ds_deadlist_obj = dsl_deadlist_clone(&ohds->ds_deadlist, 828 dsphys->ds_prev_snap_txg, dsphys->ds_prev_snap_obj, tx); 829 dsl_dataset_rele(ohds, FTAG); 830 831 if (spa_version(dp->dp_spa) >= SPA_VERSION_NEXT_CLONES) { 832 if (dsl_dataset_phys(origin)->ds_next_clones_obj == 0) { 833 dsl_dataset_phys(origin)->ds_next_clones_obj = 834 zap_create(mos, 835 DMU_OT_NEXT_CLONES, DMU_OT_NONE, 0, tx); 836 } 837 VERIFY0(zap_add_int(mos, 838 dsl_dataset_phys(origin)->ds_next_clones_obj, 839 dsobj, tx)); 840 } 841 842 dmu_buf_will_dirty(dd->dd_dbuf, tx); 843 dsl_dir_phys(dd)->dd_origin_obj = origin->ds_object; 844 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 845 if (dsl_dir_phys(origin->ds_dir)->dd_clones == 0) { 846 dmu_buf_will_dirty(origin->ds_dir->dd_dbuf, tx); 847 dsl_dir_phys(origin->ds_dir)->dd_clones = 848 zap_create(mos, 849 DMU_OT_DSL_CLONES, DMU_OT_NONE, 0, tx); 850 } 851 VERIFY0(zap_add_int(mos, 852 dsl_dir_phys(origin->ds_dir)->dd_clones, 853 dsobj, tx)); 854 } 855 } 856 857 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 858 dsphys->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 859 860 dmu_buf_rele(dbuf, FTAG); 861 862 dmu_buf_will_dirty(dd->dd_dbuf, tx); 863 dsl_dir_phys(dd)->dd_head_dataset_obj = dsobj; 864 865 return (dsobj); 866 } 867 868 static void 869 dsl_dataset_zero_zil(dsl_dataset_t *ds, dmu_tx_t *tx) 870 { 871 objset_t *os; 872 873 VERIFY0(dmu_objset_from_ds(ds, &os)); 874 bzero(&os->os_zil_header, sizeof (os->os_zil_header)); 875 dsl_dataset_dirty(ds, tx); 876 } 877 878 uint64_t 879 dsl_dataset_create_sync(dsl_dir_t *pdd, const char *lastname, 880 dsl_dataset_t *origin, uint64_t flags, cred_t *cr, dmu_tx_t *tx) 881 { 882 dsl_pool_t *dp = pdd->dd_pool; 883 uint64_t dsobj, ddobj; 884 dsl_dir_t *dd; 885 886 ASSERT(dmu_tx_is_syncing(tx)); 887 ASSERT(lastname[0] != '@'); 888 889 ddobj = dsl_dir_create_sync(dp, pdd, lastname, tx); 890 VERIFY0(dsl_dir_hold_obj(dp, ddobj, lastname, FTAG, &dd)); 891 892 dsobj = dsl_dataset_create_sync_dd(dd, origin, 893 flags & ~DS_CREATE_FLAG_NODIRTY, tx); 894 895 dsl_deleg_set_create_perms(dd, tx, cr); 896 897 /* 898 * Since we're creating a new node we know it's a leaf, so we can 899 * initialize the counts if the limit feature is active. 900 */ 901 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_FS_SS_LIMIT)) { 902 uint64_t cnt = 0; 903 objset_t *os = dd->dd_pool->dp_meta_objset; 904 905 dsl_dir_zapify(dd, tx); 906 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_FILESYSTEM_COUNT, 907 sizeof (cnt), 1, &cnt, tx)); 908 VERIFY0(zap_add(os, dd->dd_object, DD_FIELD_SNAPSHOT_COUNT, 909 sizeof (cnt), 1, &cnt, tx)); 910 } 911 912 dsl_dir_rele(dd, FTAG); 913 914 /* 915 * If we are creating a clone, make sure we zero out any stale 916 * data from the origin snapshots zil header. 917 */ 918 if (origin != NULL && !(flags & DS_CREATE_FLAG_NODIRTY)) { 919 dsl_dataset_t *ds; 920 921 VERIFY0(dsl_dataset_hold_obj(dp, dsobj, FTAG, &ds)); 922 dsl_dataset_zero_zil(ds, tx); 923 dsl_dataset_rele(ds, FTAG); 924 } 925 926 return (dsobj); 927 } 928 929 /* 930 * The unique space in the head dataset can be calculated by subtracting 931 * the space used in the most recent snapshot, that is still being used 932 * in this file system, from the space currently in use. To figure out 933 * the space in the most recent snapshot still in use, we need to take 934 * the total space used in the snapshot and subtract out the space that 935 * has been freed up since the snapshot was taken. 936 */ 937 void 938 dsl_dataset_recalc_head_uniq(dsl_dataset_t *ds) 939 { 940 uint64_t mrs_used; 941 uint64_t dlused, dlcomp, dluncomp; 942 943 ASSERT(!ds->ds_is_snapshot); 944 945 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) 946 mrs_used = dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes; 947 else 948 mrs_used = 0; 949 950 dsl_deadlist_space(&ds->ds_deadlist, &dlused, &dlcomp, &dluncomp); 951 952 ASSERT3U(dlused, <=, mrs_used); 953 dsl_dataset_phys(ds)->ds_unique_bytes = 954 dsl_dataset_phys(ds)->ds_referenced_bytes - (mrs_used - dlused); 955 956 if (spa_version(ds->ds_dir->dd_pool->dp_spa) >= 957 SPA_VERSION_UNIQUE_ACCURATE) 958 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 959 } 960 961 void 962 dsl_dataset_remove_from_next_clones(dsl_dataset_t *ds, uint64_t obj, 963 dmu_tx_t *tx) 964 { 965 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 966 uint64_t count; 967 int err; 968 969 ASSERT(dsl_dataset_phys(ds)->ds_num_children >= 2); 970 err = zap_remove_int(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 971 obj, tx); 972 /* 973 * The err should not be ENOENT, but a bug in a previous version 974 * of the code could cause upgrade_clones_cb() to not set 975 * ds_next_snap_obj when it should, leading to a missing entry. 976 * If we knew that the pool was created after 977 * SPA_VERSION_NEXT_CLONES, we could assert that it isn't 978 * ENOENT. However, at least we can check that we don't have 979 * too many entries in the next_clones_obj even after failing to 980 * remove this one. 981 */ 982 if (err != ENOENT) 983 VERIFY0(err); 984 ASSERT0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 985 &count)); 986 ASSERT3U(count, <=, dsl_dataset_phys(ds)->ds_num_children - 2); 987 } 988 989 990 blkptr_t * 991 dsl_dataset_get_blkptr(dsl_dataset_t *ds) 992 { 993 return (&dsl_dataset_phys(ds)->ds_bp); 994 } 995 996 void 997 dsl_dataset_set_blkptr(dsl_dataset_t *ds, blkptr_t *bp, dmu_tx_t *tx) 998 { 999 ASSERT(dmu_tx_is_syncing(tx)); 1000 /* If it's the meta-objset, set dp_meta_rootbp */ 1001 if (ds == NULL) { 1002 tx->tx_pool->dp_meta_rootbp = *bp; 1003 } else { 1004 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1005 dsl_dataset_phys(ds)->ds_bp = *bp; 1006 } 1007 } 1008 1009 spa_t * 1010 dsl_dataset_get_spa(dsl_dataset_t *ds) 1011 { 1012 return (ds->ds_dir->dd_pool->dp_spa); 1013 } 1014 1015 void 1016 dsl_dataset_dirty(dsl_dataset_t *ds, dmu_tx_t *tx) 1017 { 1018 dsl_pool_t *dp; 1019 1020 if (ds == NULL) /* this is the meta-objset */ 1021 return; 1022 1023 ASSERT(ds->ds_objset != NULL); 1024 1025 if (dsl_dataset_phys(ds)->ds_next_snap_obj != 0) 1026 panic("dirtying snapshot!"); 1027 1028 dp = ds->ds_dir->dd_pool; 1029 1030 if (txg_list_add(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1031 /* up the hold count until we can be written out */ 1032 dmu_buf_add_ref(ds->ds_dbuf, ds); 1033 } 1034 } 1035 1036 boolean_t 1037 dsl_dataset_is_dirty(dsl_dataset_t *ds) 1038 { 1039 for (int t = 0; t < TXG_SIZE; t++) { 1040 if (txg_list_member(&ds->ds_dir->dd_pool->dp_dirty_datasets, 1041 ds, t)) 1042 return (B_TRUE); 1043 } 1044 return (B_FALSE); 1045 } 1046 1047 static int 1048 dsl_dataset_snapshot_reserve_space(dsl_dataset_t *ds, dmu_tx_t *tx) 1049 { 1050 uint64_t asize; 1051 1052 if (!dmu_tx_is_syncing(tx)) 1053 return (0); 1054 1055 /* 1056 * If there's an fs-only reservation, any blocks that might become 1057 * owned by the snapshot dataset must be accommodated by space 1058 * outside of the reservation. 1059 */ 1060 ASSERT(ds->ds_reserved == 0 || DS_UNIQUE_IS_ACCURATE(ds)); 1061 asize = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, ds->ds_reserved); 1062 if (asize > dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) 1063 return (SET_ERROR(ENOSPC)); 1064 1065 /* 1066 * Propagate any reserved space for this snapshot to other 1067 * snapshot checks in this sync group. 1068 */ 1069 if (asize > 0) 1070 dsl_dir_willuse_space(ds->ds_dir, asize, tx); 1071 1072 return (0); 1073 } 1074 1075 typedef struct dsl_dataset_snapshot_arg { 1076 nvlist_t *ddsa_snaps; 1077 nvlist_t *ddsa_props; 1078 nvlist_t *ddsa_errors; 1079 cred_t *ddsa_cr; 1080 } dsl_dataset_snapshot_arg_t; 1081 1082 int 1083 dsl_dataset_snapshot_check_impl(dsl_dataset_t *ds, const char *snapname, 1084 dmu_tx_t *tx, boolean_t recv, uint64_t cnt, cred_t *cr) 1085 { 1086 int error; 1087 uint64_t value; 1088 1089 ds->ds_trysnap_txg = tx->tx_txg; 1090 1091 if (!dmu_tx_is_syncing(tx)) 1092 return (0); 1093 1094 /* 1095 * We don't allow multiple snapshots of the same txg. If there 1096 * is already one, try again. 1097 */ 1098 if (dsl_dataset_phys(ds)->ds_prev_snap_txg >= tx->tx_txg) 1099 return (SET_ERROR(EAGAIN)); 1100 1101 /* 1102 * Check for conflicting snapshot name. 1103 */ 1104 error = dsl_dataset_snap_lookup(ds, snapname, &value); 1105 if (error == 0) 1106 return (SET_ERROR(EEXIST)); 1107 if (error != ENOENT) 1108 return (error); 1109 1110 /* 1111 * We don't allow taking snapshots of inconsistent datasets, such as 1112 * those into which we are currently receiving. However, if we are 1113 * creating this snapshot as part of a receive, this check will be 1114 * executed atomically with respect to the completion of the receive 1115 * itself but prior to the clearing of DS_FLAG_INCONSISTENT; in this 1116 * case we ignore this, knowing it will be fixed up for us shortly in 1117 * dmu_recv_end_sync(). 1118 */ 1119 if (!recv && DS_IS_INCONSISTENT(ds)) 1120 return (SET_ERROR(EBUSY)); 1121 1122 /* 1123 * Skip the check for temporary snapshots or if we have already checked 1124 * the counts in dsl_dataset_snapshot_check. This means we really only 1125 * check the count here when we're receiving a stream. 1126 */ 1127 if (cnt != 0 && cr != NULL) { 1128 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1129 ZFS_PROP_SNAPSHOT_LIMIT, NULL, cr); 1130 if (error != 0) 1131 return (error); 1132 } 1133 1134 error = dsl_dataset_snapshot_reserve_space(ds, tx); 1135 if (error != 0) 1136 return (error); 1137 1138 return (0); 1139 } 1140 1141 static int 1142 dsl_dataset_snapshot_check(void *arg, dmu_tx_t *tx) 1143 { 1144 dsl_dataset_snapshot_arg_t *ddsa = arg; 1145 dsl_pool_t *dp = dmu_tx_pool(tx); 1146 nvpair_t *pair; 1147 int rv = 0; 1148 1149 /* 1150 * Pre-compute how many total new snapshots will be created for each 1151 * level in the tree and below. This is needed for validating the 1152 * snapshot limit when either taking a recursive snapshot or when 1153 * taking multiple snapshots. 1154 * 1155 * The problem is that the counts are not actually adjusted when 1156 * we are checking, only when we finally sync. For a single snapshot, 1157 * this is easy, the count will increase by 1 at each node up the tree, 1158 * but its more complicated for the recursive/multiple snapshot case. 1159 * 1160 * The dsl_fs_ss_limit_check function does recursively check the count 1161 * at each level up the tree but since it is validating each snapshot 1162 * independently we need to be sure that we are validating the complete 1163 * count for the entire set of snapshots. We do this by rolling up the 1164 * counts for each component of the name into an nvlist and then 1165 * checking each of those cases with the aggregated count. 1166 * 1167 * This approach properly handles not only the recursive snapshot 1168 * case (where we get all of those on the ddsa_snaps list) but also 1169 * the sibling case (e.g. snapshot a/b and a/c so that we will also 1170 * validate the limit on 'a' using a count of 2). 1171 * 1172 * We validate the snapshot names in the third loop and only report 1173 * name errors once. 1174 */ 1175 if (dmu_tx_is_syncing(tx)) { 1176 nvlist_t *cnt_track = NULL; 1177 cnt_track = fnvlist_alloc(); 1178 1179 /* Rollup aggregated counts into the cnt_track list */ 1180 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1181 pair != NULL; 1182 pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1183 char *pdelim; 1184 uint64_t val; 1185 char nm[MAXPATHLEN]; 1186 1187 (void) strlcpy(nm, nvpair_name(pair), sizeof (nm)); 1188 pdelim = strchr(nm, '@'); 1189 if (pdelim == NULL) 1190 continue; 1191 *pdelim = '\0'; 1192 1193 do { 1194 if (nvlist_lookup_uint64(cnt_track, nm, 1195 &val) == 0) { 1196 /* update existing entry */ 1197 fnvlist_add_uint64(cnt_track, nm, 1198 val + 1); 1199 } else { 1200 /* add to list */ 1201 fnvlist_add_uint64(cnt_track, nm, 1); 1202 } 1203 1204 pdelim = strrchr(nm, '/'); 1205 if (pdelim != NULL) 1206 *pdelim = '\0'; 1207 } while (pdelim != NULL); 1208 } 1209 1210 /* Check aggregated counts at each level */ 1211 for (pair = nvlist_next_nvpair(cnt_track, NULL); 1212 pair != NULL; pair = nvlist_next_nvpair(cnt_track, pair)) { 1213 int error = 0; 1214 char *name; 1215 uint64_t cnt = 0; 1216 dsl_dataset_t *ds; 1217 1218 name = nvpair_name(pair); 1219 cnt = fnvpair_value_uint64(pair); 1220 ASSERT(cnt > 0); 1221 1222 error = dsl_dataset_hold(dp, name, FTAG, &ds); 1223 if (error == 0) { 1224 error = dsl_fs_ss_limit_check(ds->ds_dir, cnt, 1225 ZFS_PROP_SNAPSHOT_LIMIT, NULL, 1226 ddsa->ddsa_cr); 1227 dsl_dataset_rele(ds, FTAG); 1228 } 1229 1230 if (error != 0) { 1231 if (ddsa->ddsa_errors != NULL) 1232 fnvlist_add_int32(ddsa->ddsa_errors, 1233 name, error); 1234 rv = error; 1235 /* only report one error for this check */ 1236 break; 1237 } 1238 } 1239 nvlist_free(cnt_track); 1240 } 1241 1242 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1243 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1244 int error = 0; 1245 dsl_dataset_t *ds; 1246 char *name, *atp; 1247 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1248 1249 name = nvpair_name(pair); 1250 if (strlen(name) >= ZFS_MAX_DATASET_NAME_LEN) 1251 error = SET_ERROR(ENAMETOOLONG); 1252 if (error == 0) { 1253 atp = strchr(name, '@'); 1254 if (atp == NULL) 1255 error = SET_ERROR(EINVAL); 1256 if (error == 0) 1257 (void) strlcpy(dsname, name, atp - name + 1); 1258 } 1259 if (error == 0) 1260 error = dsl_dataset_hold(dp, dsname, FTAG, &ds); 1261 if (error == 0) { 1262 /* passing 0/NULL skips dsl_fs_ss_limit_check */ 1263 error = dsl_dataset_snapshot_check_impl(ds, 1264 atp + 1, tx, B_FALSE, 0, NULL); 1265 dsl_dataset_rele(ds, FTAG); 1266 } 1267 1268 if (error != 0) { 1269 if (ddsa->ddsa_errors != NULL) { 1270 fnvlist_add_int32(ddsa->ddsa_errors, 1271 name, error); 1272 } 1273 rv = error; 1274 } 1275 } 1276 1277 return (rv); 1278 } 1279 1280 void 1281 dsl_dataset_snapshot_sync_impl(dsl_dataset_t *ds, const char *snapname, 1282 dmu_tx_t *tx) 1283 { 1284 static zil_header_t zero_zil; 1285 1286 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1287 dmu_buf_t *dbuf; 1288 dsl_dataset_phys_t *dsphys; 1289 uint64_t dsobj, crtxg; 1290 objset_t *mos = dp->dp_meta_objset; 1291 objset_t *os; 1292 1293 ASSERT(RRW_WRITE_HELD(&dp->dp_config_rwlock)); 1294 1295 /* 1296 * If we are on an old pool, the zil must not be active, in which 1297 * case it will be zeroed. Usually zil_suspend() accomplishes this. 1298 */ 1299 ASSERT(spa_version(dmu_tx_pool(tx)->dp_spa) >= SPA_VERSION_FAST_SNAP || 1300 dmu_objset_from_ds(ds, &os) != 0 || 1301 bcmp(&os->os_phys->os_zil_header, &zero_zil, 1302 sizeof (zero_zil)) == 0); 1303 1304 dsl_fs_ss_count_adjust(ds->ds_dir, 1, DD_FIELD_SNAPSHOT_COUNT, tx); 1305 1306 /* 1307 * The origin's ds_creation_txg has to be < TXG_INITIAL 1308 */ 1309 if (strcmp(snapname, ORIGIN_DIR_NAME) == 0) 1310 crtxg = 1; 1311 else 1312 crtxg = tx->tx_txg; 1313 1314 dsobj = dmu_object_alloc(mos, DMU_OT_DSL_DATASET, 0, 1315 DMU_OT_DSL_DATASET, sizeof (dsl_dataset_phys_t), tx); 1316 VERIFY0(dmu_bonus_hold(mos, dsobj, FTAG, &dbuf)); 1317 dmu_buf_will_dirty(dbuf, tx); 1318 dsphys = dbuf->db_data; 1319 bzero(dsphys, sizeof (dsl_dataset_phys_t)); 1320 dsphys->ds_dir_obj = ds->ds_dir->dd_object; 1321 dsphys->ds_fsid_guid = unique_create(); 1322 (void) random_get_pseudo_bytes((void*)&dsphys->ds_guid, 1323 sizeof (dsphys->ds_guid)); 1324 dsphys->ds_prev_snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 1325 dsphys->ds_prev_snap_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; 1326 dsphys->ds_next_snap_obj = ds->ds_object; 1327 dsphys->ds_num_children = 1; 1328 dsphys->ds_creation_time = gethrestime_sec(); 1329 dsphys->ds_creation_txg = crtxg; 1330 dsphys->ds_deadlist_obj = dsl_dataset_phys(ds)->ds_deadlist_obj; 1331 dsphys->ds_referenced_bytes = dsl_dataset_phys(ds)->ds_referenced_bytes; 1332 dsphys->ds_compressed_bytes = dsl_dataset_phys(ds)->ds_compressed_bytes; 1333 dsphys->ds_uncompressed_bytes = 1334 dsl_dataset_phys(ds)->ds_uncompressed_bytes; 1335 dsphys->ds_flags = dsl_dataset_phys(ds)->ds_flags; 1336 dsphys->ds_bp = dsl_dataset_phys(ds)->ds_bp; 1337 dmu_buf_rele(dbuf, FTAG); 1338 1339 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1340 if (ds->ds_feature_inuse[f]) 1341 dsl_dataset_activate_feature(dsobj, f, tx); 1342 } 1343 1344 ASSERT3U(ds->ds_prev != 0, ==, 1345 dsl_dataset_phys(ds)->ds_prev_snap_obj != 0); 1346 if (ds->ds_prev) { 1347 uint64_t next_clones_obj = 1348 dsl_dataset_phys(ds->ds_prev)->ds_next_clones_obj; 1349 ASSERT(dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1350 ds->ds_object || 1351 dsl_dataset_phys(ds->ds_prev)->ds_num_children > 1); 1352 if (dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj == 1353 ds->ds_object) { 1354 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1355 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, ==, 1356 dsl_dataset_phys(ds->ds_prev)->ds_creation_txg); 1357 dsl_dataset_phys(ds->ds_prev)->ds_next_snap_obj = dsobj; 1358 } else if (next_clones_obj != 0) { 1359 dsl_dataset_remove_from_next_clones(ds->ds_prev, 1360 dsphys->ds_next_snap_obj, tx); 1361 VERIFY0(zap_add_int(mos, 1362 next_clones_obj, dsobj, tx)); 1363 } 1364 } 1365 1366 /* 1367 * If we have a reference-reservation on this dataset, we will 1368 * need to increase the amount of refreservation being charged 1369 * since our unique space is going to zero. 1370 */ 1371 if (ds->ds_reserved) { 1372 int64_t delta; 1373 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 1374 delta = MIN(dsl_dataset_phys(ds)->ds_unique_bytes, 1375 ds->ds_reserved); 1376 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, 1377 delta, 0, 0, tx); 1378 } 1379 1380 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1381 dsl_dataset_phys(ds)->ds_deadlist_obj = 1382 dsl_deadlist_clone(&ds->ds_deadlist, UINT64_MAX, 1383 dsl_dataset_phys(ds)->ds_prev_snap_obj, tx); 1384 dsl_deadlist_close(&ds->ds_deadlist); 1385 dsl_deadlist_open(&ds->ds_deadlist, mos, 1386 dsl_dataset_phys(ds)->ds_deadlist_obj); 1387 dsl_deadlist_add_key(&ds->ds_deadlist, 1388 dsl_dataset_phys(ds)->ds_prev_snap_txg, tx); 1389 1390 ASSERT3U(dsl_dataset_phys(ds)->ds_prev_snap_txg, <, tx->tx_txg); 1391 dsl_dataset_phys(ds)->ds_prev_snap_obj = dsobj; 1392 dsl_dataset_phys(ds)->ds_prev_snap_txg = crtxg; 1393 dsl_dataset_phys(ds)->ds_unique_bytes = 0; 1394 if (spa_version(dp->dp_spa) >= SPA_VERSION_UNIQUE_ACCURATE) 1395 dsl_dataset_phys(ds)->ds_flags |= DS_FLAG_UNIQUE_ACCURATE; 1396 1397 VERIFY0(zap_add(mos, dsl_dataset_phys(ds)->ds_snapnames_zapobj, 1398 snapname, 8, 1, &dsobj, tx)); 1399 1400 if (ds->ds_prev) 1401 dsl_dataset_rele(ds->ds_prev, ds); 1402 VERIFY0(dsl_dataset_hold_obj(dp, 1403 dsl_dataset_phys(ds)->ds_prev_snap_obj, ds, &ds->ds_prev)); 1404 1405 dsl_scan_ds_snapshotted(ds, tx); 1406 1407 dsl_dir_snap_cmtime_update(ds->ds_dir); 1408 1409 spa_history_log_internal_ds(ds->ds_prev, "snapshot", tx, ""); 1410 } 1411 1412 static void 1413 dsl_dataset_snapshot_sync(void *arg, dmu_tx_t *tx) 1414 { 1415 dsl_dataset_snapshot_arg_t *ddsa = arg; 1416 dsl_pool_t *dp = dmu_tx_pool(tx); 1417 nvpair_t *pair; 1418 1419 for (pair = nvlist_next_nvpair(ddsa->ddsa_snaps, NULL); 1420 pair != NULL; pair = nvlist_next_nvpair(ddsa->ddsa_snaps, pair)) { 1421 dsl_dataset_t *ds; 1422 char *name, *atp; 1423 char dsname[ZFS_MAX_DATASET_NAME_LEN]; 1424 1425 name = nvpair_name(pair); 1426 atp = strchr(name, '@'); 1427 (void) strlcpy(dsname, name, atp - name + 1); 1428 VERIFY0(dsl_dataset_hold(dp, dsname, FTAG, &ds)); 1429 1430 dsl_dataset_snapshot_sync_impl(ds, atp + 1, tx); 1431 if (ddsa->ddsa_props != NULL) { 1432 dsl_props_set_sync_impl(ds->ds_prev, 1433 ZPROP_SRC_LOCAL, ddsa->ddsa_props, tx); 1434 } 1435 dsl_dataset_rele(ds, FTAG); 1436 } 1437 } 1438 1439 /* 1440 * The snapshots must all be in the same pool. 1441 * All-or-nothing: if there are any failures, nothing will be modified. 1442 */ 1443 int 1444 dsl_dataset_snapshot(nvlist_t *snaps, nvlist_t *props, nvlist_t *errors) 1445 { 1446 dsl_dataset_snapshot_arg_t ddsa; 1447 nvpair_t *pair; 1448 boolean_t needsuspend; 1449 int error; 1450 spa_t *spa; 1451 char *firstname; 1452 nvlist_t *suspended = NULL; 1453 1454 pair = nvlist_next_nvpair(snaps, NULL); 1455 if (pair == NULL) 1456 return (0); 1457 firstname = nvpair_name(pair); 1458 1459 error = spa_open(firstname, &spa, FTAG); 1460 if (error != 0) 1461 return (error); 1462 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1463 spa_close(spa, FTAG); 1464 1465 if (needsuspend) { 1466 suspended = fnvlist_alloc(); 1467 for (pair = nvlist_next_nvpair(snaps, NULL); pair != NULL; 1468 pair = nvlist_next_nvpair(snaps, pair)) { 1469 char fsname[ZFS_MAX_DATASET_NAME_LEN]; 1470 char *snapname = nvpair_name(pair); 1471 char *atp; 1472 void *cookie; 1473 1474 atp = strchr(snapname, '@'); 1475 if (atp == NULL) { 1476 error = SET_ERROR(EINVAL); 1477 break; 1478 } 1479 (void) strlcpy(fsname, snapname, atp - snapname + 1); 1480 1481 error = zil_suspend(fsname, &cookie); 1482 if (error != 0) 1483 break; 1484 fnvlist_add_uint64(suspended, fsname, 1485 (uintptr_t)cookie); 1486 } 1487 } 1488 1489 ddsa.ddsa_snaps = snaps; 1490 ddsa.ddsa_props = props; 1491 ddsa.ddsa_errors = errors; 1492 ddsa.ddsa_cr = CRED(); 1493 1494 if (error == 0) { 1495 error = dsl_sync_task(firstname, dsl_dataset_snapshot_check, 1496 dsl_dataset_snapshot_sync, &ddsa, 1497 fnvlist_num_pairs(snaps) * 3, ZFS_SPACE_CHECK_NORMAL); 1498 } 1499 1500 if (suspended != NULL) { 1501 for (pair = nvlist_next_nvpair(suspended, NULL); pair != NULL; 1502 pair = nvlist_next_nvpair(suspended, pair)) { 1503 zil_resume((void *)(uintptr_t) 1504 fnvpair_value_uint64(pair)); 1505 } 1506 fnvlist_free(suspended); 1507 } 1508 1509 return (error); 1510 } 1511 1512 typedef struct dsl_dataset_snapshot_tmp_arg { 1513 const char *ddsta_fsname; 1514 const char *ddsta_snapname; 1515 minor_t ddsta_cleanup_minor; 1516 const char *ddsta_htag; 1517 } dsl_dataset_snapshot_tmp_arg_t; 1518 1519 static int 1520 dsl_dataset_snapshot_tmp_check(void *arg, dmu_tx_t *tx) 1521 { 1522 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1523 dsl_pool_t *dp = dmu_tx_pool(tx); 1524 dsl_dataset_t *ds; 1525 int error; 1526 1527 error = dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds); 1528 if (error != 0) 1529 return (error); 1530 1531 /* NULL cred means no limit check for tmp snapshot */ 1532 error = dsl_dataset_snapshot_check_impl(ds, ddsta->ddsta_snapname, 1533 tx, B_FALSE, 0, NULL); 1534 if (error != 0) { 1535 dsl_dataset_rele(ds, FTAG); 1536 return (error); 1537 } 1538 1539 if (spa_version(dp->dp_spa) < SPA_VERSION_USERREFS) { 1540 dsl_dataset_rele(ds, FTAG); 1541 return (SET_ERROR(ENOTSUP)); 1542 } 1543 error = dsl_dataset_user_hold_check_one(NULL, ddsta->ddsta_htag, 1544 B_TRUE, tx); 1545 if (error != 0) { 1546 dsl_dataset_rele(ds, FTAG); 1547 return (error); 1548 } 1549 1550 dsl_dataset_rele(ds, FTAG); 1551 return (0); 1552 } 1553 1554 static void 1555 dsl_dataset_snapshot_tmp_sync(void *arg, dmu_tx_t *tx) 1556 { 1557 dsl_dataset_snapshot_tmp_arg_t *ddsta = arg; 1558 dsl_pool_t *dp = dmu_tx_pool(tx); 1559 dsl_dataset_t *ds; 1560 1561 VERIFY0(dsl_dataset_hold(dp, ddsta->ddsta_fsname, FTAG, &ds)); 1562 1563 dsl_dataset_snapshot_sync_impl(ds, ddsta->ddsta_snapname, tx); 1564 dsl_dataset_user_hold_sync_one(ds->ds_prev, ddsta->ddsta_htag, 1565 ddsta->ddsta_cleanup_minor, gethrestime_sec(), tx); 1566 dsl_destroy_snapshot_sync_impl(ds->ds_prev, B_TRUE, tx); 1567 1568 dsl_dataset_rele(ds, FTAG); 1569 } 1570 1571 int 1572 dsl_dataset_snapshot_tmp(const char *fsname, const char *snapname, 1573 minor_t cleanup_minor, const char *htag) 1574 { 1575 dsl_dataset_snapshot_tmp_arg_t ddsta; 1576 int error; 1577 spa_t *spa; 1578 boolean_t needsuspend; 1579 void *cookie; 1580 1581 ddsta.ddsta_fsname = fsname; 1582 ddsta.ddsta_snapname = snapname; 1583 ddsta.ddsta_cleanup_minor = cleanup_minor; 1584 ddsta.ddsta_htag = htag; 1585 1586 error = spa_open(fsname, &spa, FTAG); 1587 if (error != 0) 1588 return (error); 1589 needsuspend = (spa_version(spa) < SPA_VERSION_FAST_SNAP); 1590 spa_close(spa, FTAG); 1591 1592 if (needsuspend) { 1593 error = zil_suspend(fsname, &cookie); 1594 if (error != 0) 1595 return (error); 1596 } 1597 1598 error = dsl_sync_task(fsname, dsl_dataset_snapshot_tmp_check, 1599 dsl_dataset_snapshot_tmp_sync, &ddsta, 3, ZFS_SPACE_CHECK_RESERVED); 1600 1601 if (needsuspend) 1602 zil_resume(cookie); 1603 return (error); 1604 } 1605 1606 1607 void 1608 dsl_dataset_sync(dsl_dataset_t *ds, zio_t *zio, dmu_tx_t *tx) 1609 { 1610 ASSERT(dmu_tx_is_syncing(tx)); 1611 ASSERT(ds->ds_objset != NULL); 1612 ASSERT(dsl_dataset_phys(ds)->ds_next_snap_obj == 0); 1613 1614 /* 1615 * in case we had to change ds_fsid_guid when we opened it, 1616 * sync it out now. 1617 */ 1618 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1619 dsl_dataset_phys(ds)->ds_fsid_guid = ds->ds_fsid_guid; 1620 1621 if (ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] != 0) { 1622 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1623 ds->ds_object, DS_FIELD_RESUME_OBJECT, 8, 1, 1624 &ds->ds_resume_object[tx->tx_txg & TXG_MASK], tx)); 1625 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1626 ds->ds_object, DS_FIELD_RESUME_OFFSET, 8, 1, 1627 &ds->ds_resume_offset[tx->tx_txg & TXG_MASK], tx)); 1628 VERIFY0(zap_update(tx->tx_pool->dp_meta_objset, 1629 ds->ds_object, DS_FIELD_RESUME_BYTES, 8, 1, 1630 &ds->ds_resume_bytes[tx->tx_txg & TXG_MASK], tx)); 1631 ds->ds_resume_object[tx->tx_txg & TXG_MASK] = 0; 1632 ds->ds_resume_offset[tx->tx_txg & TXG_MASK] = 0; 1633 ds->ds_resume_bytes[tx->tx_txg & TXG_MASK] = 0; 1634 } 1635 1636 dmu_objset_sync(ds->ds_objset, zio, tx); 1637 1638 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 1639 if (ds->ds_feature_activation_needed[f]) { 1640 if (ds->ds_feature_inuse[f]) 1641 continue; 1642 dsl_dataset_activate_feature(ds->ds_object, f, tx); 1643 ds->ds_feature_inuse[f] = B_TRUE; 1644 } 1645 } 1646 } 1647 1648 static void 1649 get_clones_stat(dsl_dataset_t *ds, nvlist_t *nv) 1650 { 1651 uint64_t count = 0; 1652 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 1653 zap_cursor_t zc; 1654 zap_attribute_t za; 1655 nvlist_t *propval = fnvlist_alloc(); 1656 nvlist_t *val = fnvlist_alloc(); 1657 1658 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool)); 1659 1660 /* 1661 * There may be missing entries in ds_next_clones_obj 1662 * due to a bug in a previous version of the code. 1663 * Only trust it if it has the right number of entries. 1664 */ 1665 if (dsl_dataset_phys(ds)->ds_next_clones_obj != 0) { 1666 VERIFY0(zap_count(mos, dsl_dataset_phys(ds)->ds_next_clones_obj, 1667 &count)); 1668 } 1669 if (count != dsl_dataset_phys(ds)->ds_num_children - 1) 1670 goto fail; 1671 for (zap_cursor_init(&zc, mos, 1672 dsl_dataset_phys(ds)->ds_next_clones_obj); 1673 zap_cursor_retrieve(&zc, &za) == 0; 1674 zap_cursor_advance(&zc)) { 1675 dsl_dataset_t *clone; 1676 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1677 VERIFY0(dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 1678 za.za_first_integer, FTAG, &clone)); 1679 dsl_dir_name(clone->ds_dir, buf); 1680 fnvlist_add_boolean(val, buf); 1681 dsl_dataset_rele(clone, FTAG); 1682 } 1683 zap_cursor_fini(&zc); 1684 fnvlist_add_nvlist(propval, ZPROP_VALUE, val); 1685 fnvlist_add_nvlist(nv, zfs_prop_to_name(ZFS_PROP_CLONES), propval); 1686 fail: 1687 nvlist_free(val); 1688 nvlist_free(propval); 1689 } 1690 1691 static void 1692 get_receive_resume_stats(dsl_dataset_t *ds, nvlist_t *nv) 1693 { 1694 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1695 1696 if (dsl_dataset_has_resume_receive_state(ds)) { 1697 char *str; 1698 void *packed; 1699 uint8_t *compressed; 1700 uint64_t val; 1701 nvlist_t *token_nv = fnvlist_alloc(); 1702 size_t packed_size, compressed_size; 1703 1704 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1705 DS_FIELD_RESUME_FROMGUID, sizeof (val), 1, &val) == 0) { 1706 fnvlist_add_uint64(token_nv, "fromguid", val); 1707 } 1708 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1709 DS_FIELD_RESUME_OBJECT, sizeof (val), 1, &val) == 0) { 1710 fnvlist_add_uint64(token_nv, "object", val); 1711 } 1712 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1713 DS_FIELD_RESUME_OFFSET, sizeof (val), 1, &val) == 0) { 1714 fnvlist_add_uint64(token_nv, "offset", val); 1715 } 1716 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1717 DS_FIELD_RESUME_BYTES, sizeof (val), 1, &val) == 0) { 1718 fnvlist_add_uint64(token_nv, "bytes", val); 1719 } 1720 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1721 DS_FIELD_RESUME_TOGUID, sizeof (val), 1, &val) == 0) { 1722 fnvlist_add_uint64(token_nv, "toguid", val); 1723 } 1724 char buf[256]; 1725 if (zap_lookup(dp->dp_meta_objset, ds->ds_object, 1726 DS_FIELD_RESUME_TONAME, 1, sizeof (buf), buf) == 0) { 1727 fnvlist_add_string(token_nv, "toname", buf); 1728 } 1729 if (zap_contains(dp->dp_meta_objset, ds->ds_object, 1730 DS_FIELD_RESUME_EMBEDOK) == 0) { 1731 fnvlist_add_boolean(token_nv, "embedok"); 1732 } 1733 packed = fnvlist_pack(token_nv, &packed_size); 1734 fnvlist_free(token_nv); 1735 compressed = kmem_alloc(packed_size, KM_SLEEP); 1736 1737 compressed_size = gzip_compress(packed, compressed, 1738 packed_size, packed_size, 6); 1739 1740 zio_cksum_t cksum; 1741 fletcher_4_native(compressed, compressed_size, &cksum); 1742 1743 str = kmem_alloc(compressed_size * 2 + 1, KM_SLEEP); 1744 for (int i = 0; i < compressed_size; i++) { 1745 (void) sprintf(str + i * 2, "%02x", compressed[i]); 1746 } 1747 str[compressed_size * 2] = '\0'; 1748 char *propval = kmem_asprintf("%u-%llx-%llx-%s", 1749 ZFS_SEND_RESUME_TOKEN_VERSION, 1750 (longlong_t)cksum.zc_word[0], 1751 (longlong_t)packed_size, str); 1752 dsl_prop_nvlist_add_string(nv, 1753 ZFS_PROP_RECEIVE_RESUME_TOKEN, propval); 1754 kmem_free(packed, packed_size); 1755 kmem_free(str, compressed_size * 2 + 1); 1756 kmem_free(compressed, packed_size); 1757 strfree(propval); 1758 } 1759 } 1760 1761 void 1762 dsl_dataset_stats(dsl_dataset_t *ds, nvlist_t *nv) 1763 { 1764 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1765 uint64_t refd, avail, uobjs, aobjs, ratio; 1766 1767 ASSERT(dsl_pool_config_held(dp)); 1768 1769 ratio = dsl_dataset_phys(ds)->ds_compressed_bytes == 0 ? 100 : 1770 (dsl_dataset_phys(ds)->ds_uncompressed_bytes * 100 / 1771 dsl_dataset_phys(ds)->ds_compressed_bytes); 1772 1773 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRATIO, ratio); 1774 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_LOGICALREFERENCED, 1775 dsl_dataset_phys(ds)->ds_uncompressed_bytes); 1776 1777 if (ds->ds_is_snapshot) { 1778 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_COMPRESSRATIO, ratio); 1779 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USED, 1780 dsl_dataset_phys(ds)->ds_unique_bytes); 1781 get_clones_stat(ds, nv); 1782 } else { 1783 if (ds->ds_prev != NULL && ds->ds_prev != dp->dp_origin_snap) { 1784 char buf[ZFS_MAX_DATASET_NAME_LEN]; 1785 dsl_dataset_name(ds->ds_prev, buf); 1786 dsl_prop_nvlist_add_string(nv, ZFS_PROP_PREV_SNAP, buf); 1787 } 1788 1789 dsl_dir_stats(ds->ds_dir, nv); 1790 } 1791 1792 dsl_dataset_space(ds, &refd, &avail, &uobjs, &aobjs); 1793 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_AVAILABLE, avail); 1794 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFERENCED, refd); 1795 1796 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATION, 1797 dsl_dataset_phys(ds)->ds_creation_time); 1798 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_CREATETXG, 1799 dsl_dataset_phys(ds)->ds_creation_txg); 1800 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFQUOTA, 1801 ds->ds_quota); 1802 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_REFRESERVATION, 1803 ds->ds_reserved); 1804 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_GUID, 1805 dsl_dataset_phys(ds)->ds_guid); 1806 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_UNIQUE, 1807 dsl_dataset_phys(ds)->ds_unique_bytes); 1808 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_OBJSETID, 1809 ds->ds_object); 1810 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERREFS, 1811 ds->ds_userrefs); 1812 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_DEFER_DESTROY, 1813 DS_IS_DEFER_DESTROY(ds) ? 1 : 0); 1814 1815 if (dsl_dataset_phys(ds)->ds_prev_snap_obj != 0) { 1816 uint64_t written, comp, uncomp; 1817 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1818 dsl_dataset_t *prev; 1819 1820 int err = dsl_dataset_hold_obj(dp, 1821 dsl_dataset_phys(ds)->ds_prev_snap_obj, FTAG, &prev); 1822 if (err == 0) { 1823 err = dsl_dataset_space_written(prev, ds, &written, 1824 &comp, &uncomp); 1825 dsl_dataset_rele(prev, FTAG); 1826 if (err == 0) { 1827 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_WRITTEN, 1828 written); 1829 } 1830 } 1831 } 1832 1833 if (!dsl_dataset_is_snapshot(ds)) { 1834 /* 1835 * A failed "newfs" (e.g. full) resumable receive leaves 1836 * the stats set on this dataset. Check here for the prop. 1837 */ 1838 get_receive_resume_stats(ds, nv); 1839 1840 /* 1841 * A failed incremental resumable receive leaves the 1842 * stats set on our child named "%recv". Check the child 1843 * for the prop. 1844 */ 1845 /* 6 extra bytes for /%recv */ 1846 char recvname[ZFS_MAX_DATASET_NAME_LEN + 6]; 1847 dsl_dataset_t *recv_ds; 1848 dsl_dataset_name(ds, recvname); 1849 if (strlcat(recvname, "/", sizeof (recvname)) < 1850 sizeof (recvname) && 1851 strlcat(recvname, recv_clone_name, sizeof (recvname)) < 1852 sizeof (recvname) && 1853 dsl_dataset_hold(dp, recvname, FTAG, &recv_ds) == 0) { 1854 get_receive_resume_stats(recv_ds, nv); 1855 dsl_dataset_rele(recv_ds, FTAG); 1856 } 1857 } 1858 } 1859 1860 void 1861 dsl_dataset_fast_stat(dsl_dataset_t *ds, dmu_objset_stats_t *stat) 1862 { 1863 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1864 ASSERT(dsl_pool_config_held(dp)); 1865 1866 stat->dds_creation_txg = dsl_dataset_phys(ds)->ds_creation_txg; 1867 stat->dds_inconsistent = 1868 dsl_dataset_phys(ds)->ds_flags & DS_FLAG_INCONSISTENT; 1869 stat->dds_guid = dsl_dataset_phys(ds)->ds_guid; 1870 stat->dds_origin[0] = '\0'; 1871 if (ds->ds_is_snapshot) { 1872 stat->dds_is_snapshot = B_TRUE; 1873 stat->dds_num_clones = 1874 dsl_dataset_phys(ds)->ds_num_children - 1; 1875 } else { 1876 stat->dds_is_snapshot = B_FALSE; 1877 stat->dds_num_clones = 0; 1878 1879 if (dsl_dir_is_clone(ds->ds_dir)) { 1880 dsl_dataset_t *ods; 1881 1882 VERIFY0(dsl_dataset_hold_obj(dp, 1883 dsl_dir_phys(ds->ds_dir)->dd_origin_obj, 1884 FTAG, &ods)); 1885 dsl_dataset_name(ods, stat->dds_origin); 1886 dsl_dataset_rele(ods, FTAG); 1887 } 1888 } 1889 } 1890 1891 uint64_t 1892 dsl_dataset_fsid_guid(dsl_dataset_t *ds) 1893 { 1894 return (ds->ds_fsid_guid); 1895 } 1896 1897 void 1898 dsl_dataset_space(dsl_dataset_t *ds, 1899 uint64_t *refdbytesp, uint64_t *availbytesp, 1900 uint64_t *usedobjsp, uint64_t *availobjsp) 1901 { 1902 *refdbytesp = dsl_dataset_phys(ds)->ds_referenced_bytes; 1903 *availbytesp = dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE); 1904 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) 1905 *availbytesp += 1906 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes; 1907 if (ds->ds_quota != 0) { 1908 /* 1909 * Adjust available bytes according to refquota 1910 */ 1911 if (*refdbytesp < ds->ds_quota) 1912 *availbytesp = MIN(*availbytesp, 1913 ds->ds_quota - *refdbytesp); 1914 else 1915 *availbytesp = 0; 1916 } 1917 *usedobjsp = BP_GET_FILL(&dsl_dataset_phys(ds)->ds_bp); 1918 *availobjsp = DN_MAX_OBJECT - *usedobjsp; 1919 } 1920 1921 boolean_t 1922 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap) 1923 { 1924 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1925 1926 ASSERT(dsl_pool_config_held(dp)); 1927 if (snap == NULL) 1928 return (B_FALSE); 1929 if (dsl_dataset_phys(ds)->ds_bp.blk_birth > 1930 dsl_dataset_phys(snap)->ds_creation_txg) { 1931 objset_t *os, *os_snap; 1932 /* 1933 * It may be that only the ZIL differs, because it was 1934 * reset in the head. Don't count that as being 1935 * modified. 1936 */ 1937 if (dmu_objset_from_ds(ds, &os) != 0) 1938 return (B_TRUE); 1939 if (dmu_objset_from_ds(snap, &os_snap) != 0) 1940 return (B_TRUE); 1941 return (bcmp(&os->os_phys->os_meta_dnode, 1942 &os_snap->os_phys->os_meta_dnode, 1943 sizeof (os->os_phys->os_meta_dnode)) != 0); 1944 } 1945 return (B_FALSE); 1946 } 1947 1948 typedef struct dsl_dataset_rename_snapshot_arg { 1949 const char *ddrsa_fsname; 1950 const char *ddrsa_oldsnapname; 1951 const char *ddrsa_newsnapname; 1952 boolean_t ddrsa_recursive; 1953 dmu_tx_t *ddrsa_tx; 1954 } dsl_dataset_rename_snapshot_arg_t; 1955 1956 /* ARGSUSED */ 1957 static int 1958 dsl_dataset_rename_snapshot_check_impl(dsl_pool_t *dp, 1959 dsl_dataset_t *hds, void *arg) 1960 { 1961 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1962 int error; 1963 uint64_t val; 1964 1965 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 1966 if (error != 0) { 1967 /* ignore nonexistent snapshots */ 1968 return (error == ENOENT ? 0 : error); 1969 } 1970 1971 /* new name should not exist */ 1972 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_newsnapname, &val); 1973 if (error == 0) 1974 error = SET_ERROR(EEXIST); 1975 else if (error == ENOENT) 1976 error = 0; 1977 1978 /* dataset name + 1 for the "@" + the new snapshot name must fit */ 1979 if (dsl_dir_namelen(hds->ds_dir) + 1 + 1980 strlen(ddrsa->ddrsa_newsnapname) >= ZFS_MAX_DATASET_NAME_LEN) 1981 error = SET_ERROR(ENAMETOOLONG); 1982 1983 return (error); 1984 } 1985 1986 static int 1987 dsl_dataset_rename_snapshot_check(void *arg, dmu_tx_t *tx) 1988 { 1989 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 1990 dsl_pool_t *dp = dmu_tx_pool(tx); 1991 dsl_dataset_t *hds; 1992 int error; 1993 1994 error = dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds); 1995 if (error != 0) 1996 return (error); 1997 1998 if (ddrsa->ddrsa_recursive) { 1999 error = dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2000 dsl_dataset_rename_snapshot_check_impl, ddrsa, 2001 DS_FIND_CHILDREN); 2002 } else { 2003 error = dsl_dataset_rename_snapshot_check_impl(dp, hds, ddrsa); 2004 } 2005 dsl_dataset_rele(hds, FTAG); 2006 return (error); 2007 } 2008 2009 static int 2010 dsl_dataset_rename_snapshot_sync_impl(dsl_pool_t *dp, 2011 dsl_dataset_t *hds, void *arg) 2012 { 2013 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2014 dsl_dataset_t *ds; 2015 uint64_t val; 2016 dmu_tx_t *tx = ddrsa->ddrsa_tx; 2017 int error; 2018 2019 error = dsl_dataset_snap_lookup(hds, ddrsa->ddrsa_oldsnapname, &val); 2020 ASSERT(error == 0 || error == ENOENT); 2021 if (error == ENOENT) { 2022 /* ignore nonexistent snapshots */ 2023 return (0); 2024 } 2025 2026 VERIFY0(dsl_dataset_hold_obj(dp, val, FTAG, &ds)); 2027 2028 /* log before we change the name */ 2029 spa_history_log_internal_ds(ds, "rename", tx, 2030 "-> @%s", ddrsa->ddrsa_newsnapname); 2031 2032 VERIFY0(dsl_dataset_snap_remove(hds, ddrsa->ddrsa_oldsnapname, tx, 2033 B_FALSE)); 2034 mutex_enter(&ds->ds_lock); 2035 (void) strcpy(ds->ds_snapname, ddrsa->ddrsa_newsnapname); 2036 mutex_exit(&ds->ds_lock); 2037 VERIFY0(zap_add(dp->dp_meta_objset, 2038 dsl_dataset_phys(hds)->ds_snapnames_zapobj, 2039 ds->ds_snapname, 8, 1, &ds->ds_object, tx)); 2040 2041 dsl_dataset_rele(ds, FTAG); 2042 return (0); 2043 } 2044 2045 static void 2046 dsl_dataset_rename_snapshot_sync(void *arg, dmu_tx_t *tx) 2047 { 2048 dsl_dataset_rename_snapshot_arg_t *ddrsa = arg; 2049 dsl_pool_t *dp = dmu_tx_pool(tx); 2050 dsl_dataset_t *hds; 2051 2052 VERIFY0(dsl_dataset_hold(dp, ddrsa->ddrsa_fsname, FTAG, &hds)); 2053 ddrsa->ddrsa_tx = tx; 2054 if (ddrsa->ddrsa_recursive) { 2055 VERIFY0(dmu_objset_find_dp(dp, hds->ds_dir->dd_object, 2056 dsl_dataset_rename_snapshot_sync_impl, ddrsa, 2057 DS_FIND_CHILDREN)); 2058 } else { 2059 VERIFY0(dsl_dataset_rename_snapshot_sync_impl(dp, hds, ddrsa)); 2060 } 2061 dsl_dataset_rele(hds, FTAG); 2062 } 2063 2064 int 2065 dsl_dataset_rename_snapshot(const char *fsname, 2066 const char *oldsnapname, const char *newsnapname, boolean_t recursive) 2067 { 2068 dsl_dataset_rename_snapshot_arg_t ddrsa; 2069 2070 ddrsa.ddrsa_fsname = fsname; 2071 ddrsa.ddrsa_oldsnapname = oldsnapname; 2072 ddrsa.ddrsa_newsnapname = newsnapname; 2073 ddrsa.ddrsa_recursive = recursive; 2074 2075 return (dsl_sync_task(fsname, dsl_dataset_rename_snapshot_check, 2076 dsl_dataset_rename_snapshot_sync, &ddrsa, 2077 1, ZFS_SPACE_CHECK_RESERVED)); 2078 } 2079 2080 /* 2081 * If we're doing an ownership handoff, we need to make sure that there is 2082 * only one long hold on the dataset. We're not allowed to change anything here 2083 * so we don't permanently release the long hold or regular hold here. We want 2084 * to do this only when syncing to avoid the dataset unexpectedly going away 2085 * when we release the long hold. 2086 */ 2087 static int 2088 dsl_dataset_handoff_check(dsl_dataset_t *ds, void *owner, dmu_tx_t *tx) 2089 { 2090 boolean_t held; 2091 2092 if (!dmu_tx_is_syncing(tx)) 2093 return (0); 2094 2095 if (owner != NULL) { 2096 VERIFY3P(ds->ds_owner, ==, owner); 2097 dsl_dataset_long_rele(ds, owner); 2098 } 2099 2100 held = dsl_dataset_long_held(ds); 2101 2102 if (owner != NULL) 2103 dsl_dataset_long_hold(ds, owner); 2104 2105 if (held) 2106 return (SET_ERROR(EBUSY)); 2107 2108 return (0); 2109 } 2110 2111 typedef struct dsl_dataset_rollback_arg { 2112 const char *ddra_fsname; 2113 void *ddra_owner; 2114 nvlist_t *ddra_result; 2115 } dsl_dataset_rollback_arg_t; 2116 2117 static int 2118 dsl_dataset_rollback_check(void *arg, dmu_tx_t *tx) 2119 { 2120 dsl_dataset_rollback_arg_t *ddra = arg; 2121 dsl_pool_t *dp = dmu_tx_pool(tx); 2122 dsl_dataset_t *ds; 2123 int64_t unused_refres_delta; 2124 int error; 2125 2126 error = dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds); 2127 if (error != 0) 2128 return (error); 2129 2130 /* must not be a snapshot */ 2131 if (ds->ds_is_snapshot) { 2132 dsl_dataset_rele(ds, FTAG); 2133 return (SET_ERROR(EINVAL)); 2134 } 2135 2136 /* must have a most recent snapshot */ 2137 if (dsl_dataset_phys(ds)->ds_prev_snap_txg < TXG_INITIAL) { 2138 dsl_dataset_rele(ds, FTAG); 2139 return (SET_ERROR(EINVAL)); 2140 } 2141 2142 /* must not have any bookmarks after the most recent snapshot */ 2143 nvlist_t *proprequest = fnvlist_alloc(); 2144 fnvlist_add_boolean(proprequest, zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2145 nvlist_t *bookmarks = fnvlist_alloc(); 2146 error = dsl_get_bookmarks_impl(ds, proprequest, bookmarks); 2147 fnvlist_free(proprequest); 2148 if (error != 0) 2149 return (error); 2150 for (nvpair_t *pair = nvlist_next_nvpair(bookmarks, NULL); 2151 pair != NULL; pair = nvlist_next_nvpair(bookmarks, pair)) { 2152 nvlist_t *valuenv = 2153 fnvlist_lookup_nvlist(fnvpair_value_nvlist(pair), 2154 zfs_prop_to_name(ZFS_PROP_CREATETXG)); 2155 uint64_t createtxg = fnvlist_lookup_uint64(valuenv, "value"); 2156 if (createtxg > dsl_dataset_phys(ds)->ds_prev_snap_txg) { 2157 fnvlist_free(bookmarks); 2158 dsl_dataset_rele(ds, FTAG); 2159 return (SET_ERROR(EEXIST)); 2160 } 2161 } 2162 fnvlist_free(bookmarks); 2163 2164 error = dsl_dataset_handoff_check(ds, ddra->ddra_owner, tx); 2165 if (error != 0) { 2166 dsl_dataset_rele(ds, FTAG); 2167 return (error); 2168 } 2169 2170 /* 2171 * Check if the snap we are rolling back to uses more than 2172 * the refquota. 2173 */ 2174 if (ds->ds_quota != 0 && 2175 dsl_dataset_phys(ds->ds_prev)->ds_referenced_bytes > ds->ds_quota) { 2176 dsl_dataset_rele(ds, FTAG); 2177 return (SET_ERROR(EDQUOT)); 2178 } 2179 2180 /* 2181 * When we do the clone swap, we will temporarily use more space 2182 * due to the refreservation (the head will no longer have any 2183 * unique space, so the entire amount of the refreservation will need 2184 * to be free). We will immediately destroy the clone, freeing 2185 * this space, but the freeing happens over many txg's. 2186 */ 2187 unused_refres_delta = (int64_t)MIN(ds->ds_reserved, 2188 dsl_dataset_phys(ds)->ds_unique_bytes); 2189 2190 if (unused_refres_delta > 0 && 2191 unused_refres_delta > 2192 dsl_dir_space_available(ds->ds_dir, NULL, 0, TRUE)) { 2193 dsl_dataset_rele(ds, FTAG); 2194 return (SET_ERROR(ENOSPC)); 2195 } 2196 2197 dsl_dataset_rele(ds, FTAG); 2198 return (0); 2199 } 2200 2201 static void 2202 dsl_dataset_rollback_sync(void *arg, dmu_tx_t *tx) 2203 { 2204 dsl_dataset_rollback_arg_t *ddra = arg; 2205 dsl_pool_t *dp = dmu_tx_pool(tx); 2206 dsl_dataset_t *ds, *clone; 2207 uint64_t cloneobj; 2208 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 2209 2210 VERIFY0(dsl_dataset_hold(dp, ddra->ddra_fsname, FTAG, &ds)); 2211 2212 dsl_dataset_name(ds->ds_prev, namebuf); 2213 fnvlist_add_string(ddra->ddra_result, "target", namebuf); 2214 2215 cloneobj = dsl_dataset_create_sync(ds->ds_dir, "%rollback", 2216 ds->ds_prev, DS_CREATE_FLAG_NODIRTY, kcred, tx); 2217 2218 VERIFY0(dsl_dataset_hold_obj(dp, cloneobj, FTAG, &clone)); 2219 2220 dsl_dataset_clone_swap_sync_impl(clone, ds, tx); 2221 dsl_dataset_zero_zil(ds, tx); 2222 2223 dsl_destroy_head_sync_impl(clone, tx); 2224 2225 dsl_dataset_rele(clone, FTAG); 2226 dsl_dataset_rele(ds, FTAG); 2227 } 2228 2229 /* 2230 * Rolls back the given filesystem or volume to the most recent snapshot. 2231 * The name of the most recent snapshot will be returned under key "target" 2232 * in the result nvlist. 2233 * 2234 * If owner != NULL: 2235 * - The existing dataset MUST be owned by the specified owner at entry 2236 * - Upon return, dataset will still be held by the same owner, whether we 2237 * succeed or not. 2238 * 2239 * This mode is required any time the existing filesystem is mounted. See 2240 * notes above zfs_suspend_fs() for further details. 2241 */ 2242 int 2243 dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result) 2244 { 2245 dsl_dataset_rollback_arg_t ddra; 2246 2247 ddra.ddra_fsname = fsname; 2248 ddra.ddra_owner = owner; 2249 ddra.ddra_result = result; 2250 2251 return (dsl_sync_task(fsname, dsl_dataset_rollback_check, 2252 dsl_dataset_rollback_sync, &ddra, 2253 1, ZFS_SPACE_CHECK_RESERVED)); 2254 } 2255 2256 struct promotenode { 2257 list_node_t link; 2258 dsl_dataset_t *ds; 2259 }; 2260 2261 typedef struct dsl_dataset_promote_arg { 2262 const char *ddpa_clonename; 2263 dsl_dataset_t *ddpa_clone; 2264 list_t shared_snaps, origin_snaps, clone_snaps; 2265 dsl_dataset_t *origin_origin; /* origin of the origin */ 2266 uint64_t used, comp, uncomp, unique, cloneusedsnap, originusedsnap; 2267 char *err_ds; 2268 cred_t *cr; 2269 } dsl_dataset_promote_arg_t; 2270 2271 static int snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep); 2272 static int promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, 2273 void *tag); 2274 static void promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag); 2275 2276 static int 2277 dsl_dataset_promote_check(void *arg, dmu_tx_t *tx) 2278 { 2279 dsl_dataset_promote_arg_t *ddpa = arg; 2280 dsl_pool_t *dp = dmu_tx_pool(tx); 2281 dsl_dataset_t *hds; 2282 struct promotenode *snap; 2283 dsl_dataset_t *origin_ds; 2284 int err; 2285 uint64_t unused; 2286 uint64_t ss_mv_cnt; 2287 size_t max_snap_len; 2288 2289 err = promote_hold(ddpa, dp, FTAG); 2290 if (err != 0) 2291 return (err); 2292 2293 hds = ddpa->ddpa_clone; 2294 max_snap_len = MAXNAMELEN - strlen(ddpa->ddpa_clonename) - 1; 2295 2296 if (dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE) { 2297 promote_rele(ddpa, FTAG); 2298 return (SET_ERROR(EXDEV)); 2299 } 2300 2301 /* 2302 * Compute and check the amount of space to transfer. Since this is 2303 * so expensive, don't do the preliminary check. 2304 */ 2305 if (!dmu_tx_is_syncing(tx)) { 2306 promote_rele(ddpa, FTAG); 2307 return (0); 2308 } 2309 2310 snap = list_head(&ddpa->shared_snaps); 2311 origin_ds = snap->ds; 2312 2313 /* compute origin's new unique space */ 2314 snap = list_tail(&ddpa->clone_snaps); 2315 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2316 origin_ds->ds_object); 2317 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2318 dsl_dataset_phys(origin_ds)->ds_prev_snap_txg, UINT64_MAX, 2319 &ddpa->unique, &unused, &unused); 2320 2321 /* 2322 * Walk the snapshots that we are moving 2323 * 2324 * Compute space to transfer. Consider the incremental changes 2325 * to used by each snapshot: 2326 * (my used) = (prev's used) + (blocks born) - (blocks killed) 2327 * So each snapshot gave birth to: 2328 * (blocks born) = (my used) - (prev's used) + (blocks killed) 2329 * So a sequence would look like: 2330 * (uN - u(N-1) + kN) + ... + (u1 - u0 + k1) + (u0 - 0 + k0) 2331 * Which simplifies to: 2332 * uN + kN + kN-1 + ... + k1 + k0 2333 * Note however, if we stop before we reach the ORIGIN we get: 2334 * uN + kN + kN-1 + ... + kM - uM-1 2335 */ 2336 ss_mv_cnt = 0; 2337 ddpa->used = dsl_dataset_phys(origin_ds)->ds_referenced_bytes; 2338 ddpa->comp = dsl_dataset_phys(origin_ds)->ds_compressed_bytes; 2339 ddpa->uncomp = dsl_dataset_phys(origin_ds)->ds_uncompressed_bytes; 2340 for (snap = list_head(&ddpa->shared_snaps); snap; 2341 snap = list_next(&ddpa->shared_snaps, snap)) { 2342 uint64_t val, dlused, dlcomp, dluncomp; 2343 dsl_dataset_t *ds = snap->ds; 2344 2345 ss_mv_cnt++; 2346 2347 /* 2348 * If there are long holds, we won't be able to evict 2349 * the objset. 2350 */ 2351 if (dsl_dataset_long_held(ds)) { 2352 err = SET_ERROR(EBUSY); 2353 goto out; 2354 } 2355 2356 /* Check that the snapshot name does not conflict */ 2357 VERIFY0(dsl_dataset_get_snapname(ds)); 2358 if (strlen(ds->ds_snapname) >= max_snap_len) { 2359 err = SET_ERROR(ENAMETOOLONG); 2360 goto out; 2361 } 2362 err = dsl_dataset_snap_lookup(hds, ds->ds_snapname, &val); 2363 if (err == 0) { 2364 (void) strcpy(ddpa->err_ds, snap->ds->ds_snapname); 2365 err = SET_ERROR(EEXIST); 2366 goto out; 2367 } 2368 if (err != ENOENT) 2369 goto out; 2370 2371 /* The very first snapshot does not have a deadlist */ 2372 if (dsl_dataset_phys(ds)->ds_prev_snap_obj == 0) 2373 continue; 2374 2375 dsl_deadlist_space(&ds->ds_deadlist, 2376 &dlused, &dlcomp, &dluncomp); 2377 ddpa->used += dlused; 2378 ddpa->comp += dlcomp; 2379 ddpa->uncomp += dluncomp; 2380 } 2381 2382 /* 2383 * If we are a clone of a clone then we never reached ORIGIN, 2384 * so we need to subtract out the clone origin's used space. 2385 */ 2386 if (ddpa->origin_origin) { 2387 ddpa->used -= 2388 dsl_dataset_phys(ddpa->origin_origin)->ds_referenced_bytes; 2389 ddpa->comp -= 2390 dsl_dataset_phys(ddpa->origin_origin)->ds_compressed_bytes; 2391 ddpa->uncomp -= 2392 dsl_dataset_phys(ddpa->origin_origin)-> 2393 ds_uncompressed_bytes; 2394 } 2395 2396 /* Check that there is enough space and limit headroom here */ 2397 err = dsl_dir_transfer_possible(origin_ds->ds_dir, hds->ds_dir, 2398 0, ss_mv_cnt, ddpa->used, ddpa->cr); 2399 if (err != 0) 2400 goto out; 2401 2402 /* 2403 * Compute the amounts of space that will be used by snapshots 2404 * after the promotion (for both origin and clone). For each, 2405 * it is the amount of space that will be on all of their 2406 * deadlists (that was not born before their new origin). 2407 */ 2408 if (dsl_dir_phys(hds->ds_dir)->dd_flags & DD_FLAG_USED_BREAKDOWN) { 2409 uint64_t space; 2410 2411 /* 2412 * Note, typically this will not be a clone of a clone, 2413 * so dd_origin_txg will be < TXG_INITIAL, so 2414 * these snaplist_space() -> dsl_deadlist_space_range() 2415 * calls will be fast because they do not have to 2416 * iterate over all bps. 2417 */ 2418 snap = list_head(&ddpa->origin_snaps); 2419 err = snaplist_space(&ddpa->shared_snaps, 2420 snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap); 2421 if (err != 0) 2422 goto out; 2423 2424 err = snaplist_space(&ddpa->clone_snaps, 2425 snap->ds->ds_dir->dd_origin_txg, &space); 2426 if (err != 0) 2427 goto out; 2428 ddpa->cloneusedsnap += space; 2429 } 2430 if (dsl_dir_phys(origin_ds->ds_dir)->dd_flags & 2431 DD_FLAG_USED_BREAKDOWN) { 2432 err = snaplist_space(&ddpa->origin_snaps, 2433 dsl_dataset_phys(origin_ds)->ds_creation_txg, 2434 &ddpa->originusedsnap); 2435 if (err != 0) 2436 goto out; 2437 } 2438 2439 out: 2440 promote_rele(ddpa, FTAG); 2441 return (err); 2442 } 2443 2444 static void 2445 dsl_dataset_promote_sync(void *arg, dmu_tx_t *tx) 2446 { 2447 dsl_dataset_promote_arg_t *ddpa = arg; 2448 dsl_pool_t *dp = dmu_tx_pool(tx); 2449 dsl_dataset_t *hds; 2450 struct promotenode *snap; 2451 dsl_dataset_t *origin_ds; 2452 dsl_dataset_t *origin_head; 2453 dsl_dir_t *dd; 2454 dsl_dir_t *odd = NULL; 2455 uint64_t oldnext_obj; 2456 int64_t delta; 2457 2458 VERIFY0(promote_hold(ddpa, dp, FTAG)); 2459 hds = ddpa->ddpa_clone; 2460 2461 ASSERT0(dsl_dataset_phys(hds)->ds_flags & DS_FLAG_NOPROMOTE); 2462 2463 snap = list_head(&ddpa->shared_snaps); 2464 origin_ds = snap->ds; 2465 dd = hds->ds_dir; 2466 2467 snap = list_head(&ddpa->origin_snaps); 2468 origin_head = snap->ds; 2469 2470 /* 2471 * We need to explicitly open odd, since origin_ds's dd will be 2472 * changing. 2473 */ 2474 VERIFY0(dsl_dir_hold_obj(dp, origin_ds->ds_dir->dd_object, 2475 NULL, FTAG, &odd)); 2476 2477 /* change origin's next snap */ 2478 dmu_buf_will_dirty(origin_ds->ds_dbuf, tx); 2479 oldnext_obj = dsl_dataset_phys(origin_ds)->ds_next_snap_obj; 2480 snap = list_tail(&ddpa->clone_snaps); 2481 ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==, 2482 origin_ds->ds_object); 2483 dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object; 2484 2485 /* change the origin's next clone */ 2486 if (dsl_dataset_phys(origin_ds)->ds_next_clones_obj) { 2487 dsl_dataset_remove_from_next_clones(origin_ds, 2488 snap->ds->ds_object, tx); 2489 VERIFY0(zap_add_int(dp->dp_meta_objset, 2490 dsl_dataset_phys(origin_ds)->ds_next_clones_obj, 2491 oldnext_obj, tx)); 2492 } 2493 2494 /* change origin */ 2495 dmu_buf_will_dirty(dd->dd_dbuf, tx); 2496 ASSERT3U(dsl_dir_phys(dd)->dd_origin_obj, ==, origin_ds->ds_object); 2497 dsl_dir_phys(dd)->dd_origin_obj = dsl_dir_phys(odd)->dd_origin_obj; 2498 dd->dd_origin_txg = origin_head->ds_dir->dd_origin_txg; 2499 dmu_buf_will_dirty(odd->dd_dbuf, tx); 2500 dsl_dir_phys(odd)->dd_origin_obj = origin_ds->ds_object; 2501 origin_head->ds_dir->dd_origin_txg = 2502 dsl_dataset_phys(origin_ds)->ds_creation_txg; 2503 2504 /* change dd_clone entries */ 2505 if (spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2506 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2507 dsl_dir_phys(odd)->dd_clones, hds->ds_object, tx)); 2508 VERIFY0(zap_add_int(dp->dp_meta_objset, 2509 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2510 hds->ds_object, tx)); 2511 2512 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2513 dsl_dir_phys(ddpa->origin_origin->ds_dir)->dd_clones, 2514 origin_head->ds_object, tx)); 2515 if (dsl_dir_phys(dd)->dd_clones == 0) { 2516 dsl_dir_phys(dd)->dd_clones = 2517 zap_create(dp->dp_meta_objset, DMU_OT_DSL_CLONES, 2518 DMU_OT_NONE, 0, tx); 2519 } 2520 VERIFY0(zap_add_int(dp->dp_meta_objset, 2521 dsl_dir_phys(dd)->dd_clones, origin_head->ds_object, tx)); 2522 } 2523 2524 /* move snapshots to this dir */ 2525 for (snap = list_head(&ddpa->shared_snaps); snap; 2526 snap = list_next(&ddpa->shared_snaps, snap)) { 2527 dsl_dataset_t *ds = snap->ds; 2528 2529 /* 2530 * Property callbacks are registered to a particular 2531 * dsl_dir. Since ours is changing, evict the objset 2532 * so that they will be unregistered from the old dsl_dir. 2533 */ 2534 if (ds->ds_objset) { 2535 dmu_objset_evict(ds->ds_objset); 2536 ds->ds_objset = NULL; 2537 } 2538 2539 /* move snap name entry */ 2540 VERIFY0(dsl_dataset_get_snapname(ds)); 2541 VERIFY0(dsl_dataset_snap_remove(origin_head, 2542 ds->ds_snapname, tx, B_TRUE)); 2543 VERIFY0(zap_add(dp->dp_meta_objset, 2544 dsl_dataset_phys(hds)->ds_snapnames_zapobj, ds->ds_snapname, 2545 8, 1, &ds->ds_object, tx)); 2546 dsl_fs_ss_count_adjust(hds->ds_dir, 1, 2547 DD_FIELD_SNAPSHOT_COUNT, tx); 2548 2549 /* change containing dsl_dir */ 2550 dmu_buf_will_dirty(ds->ds_dbuf, tx); 2551 ASSERT3U(dsl_dataset_phys(ds)->ds_dir_obj, ==, odd->dd_object); 2552 dsl_dataset_phys(ds)->ds_dir_obj = dd->dd_object; 2553 ASSERT3P(ds->ds_dir, ==, odd); 2554 dsl_dir_rele(ds->ds_dir, ds); 2555 VERIFY0(dsl_dir_hold_obj(dp, dd->dd_object, 2556 NULL, ds, &ds->ds_dir)); 2557 2558 /* move any clone references */ 2559 if (dsl_dataset_phys(ds)->ds_next_clones_obj && 2560 spa_version(dp->dp_spa) >= SPA_VERSION_DIR_CLONES) { 2561 zap_cursor_t zc; 2562 zap_attribute_t za; 2563 2564 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2565 dsl_dataset_phys(ds)->ds_next_clones_obj); 2566 zap_cursor_retrieve(&zc, &za) == 0; 2567 zap_cursor_advance(&zc)) { 2568 dsl_dataset_t *cnds; 2569 uint64_t o; 2570 2571 if (za.za_first_integer == oldnext_obj) { 2572 /* 2573 * We've already moved the 2574 * origin's reference. 2575 */ 2576 continue; 2577 } 2578 2579 VERIFY0(dsl_dataset_hold_obj(dp, 2580 za.za_first_integer, FTAG, &cnds)); 2581 o = dsl_dir_phys(cnds->ds_dir)-> 2582 dd_head_dataset_obj; 2583 2584 VERIFY0(zap_remove_int(dp->dp_meta_objset, 2585 dsl_dir_phys(odd)->dd_clones, o, tx)); 2586 VERIFY0(zap_add_int(dp->dp_meta_objset, 2587 dsl_dir_phys(dd)->dd_clones, o, tx)); 2588 dsl_dataset_rele(cnds, FTAG); 2589 } 2590 zap_cursor_fini(&zc); 2591 } 2592 2593 ASSERT(!dsl_prop_hascb(ds)); 2594 } 2595 2596 /* 2597 * Change space accounting. 2598 * Note, pa->*usedsnap and dd_used_breakdown[SNAP] will either 2599 * both be valid, or both be 0 (resulting in delta == 0). This 2600 * is true for each of {clone,origin} independently. 2601 */ 2602 2603 delta = ddpa->cloneusedsnap - 2604 dsl_dir_phys(dd)->dd_used_breakdown[DD_USED_SNAP]; 2605 ASSERT3S(delta, >=, 0); 2606 ASSERT3U(ddpa->used, >=, delta); 2607 dsl_dir_diduse_space(dd, DD_USED_SNAP, delta, 0, 0, tx); 2608 dsl_dir_diduse_space(dd, DD_USED_HEAD, 2609 ddpa->used - delta, ddpa->comp, ddpa->uncomp, tx); 2610 2611 delta = ddpa->originusedsnap - 2612 dsl_dir_phys(odd)->dd_used_breakdown[DD_USED_SNAP]; 2613 ASSERT3S(delta, <=, 0); 2614 ASSERT3U(ddpa->used, >=, -delta); 2615 dsl_dir_diduse_space(odd, DD_USED_SNAP, delta, 0, 0, tx); 2616 dsl_dir_diduse_space(odd, DD_USED_HEAD, 2617 -ddpa->used - delta, -ddpa->comp, -ddpa->uncomp, tx); 2618 2619 dsl_dataset_phys(origin_ds)->ds_unique_bytes = ddpa->unique; 2620 2621 /* log history record */ 2622 spa_history_log_internal_ds(hds, "promote", tx, ""); 2623 2624 dsl_dir_rele(odd, FTAG); 2625 promote_rele(ddpa, FTAG); 2626 } 2627 2628 /* 2629 * Make a list of dsl_dataset_t's for the snapshots between first_obj 2630 * (exclusive) and last_obj (inclusive). The list will be in reverse 2631 * order (last_obj will be the list_head()). If first_obj == 0, do all 2632 * snapshots back to this dataset's origin. 2633 */ 2634 static int 2635 snaplist_make(dsl_pool_t *dp, 2636 uint64_t first_obj, uint64_t last_obj, list_t *l, void *tag) 2637 { 2638 uint64_t obj = last_obj; 2639 2640 list_create(l, sizeof (struct promotenode), 2641 offsetof(struct promotenode, link)); 2642 2643 while (obj != first_obj) { 2644 dsl_dataset_t *ds; 2645 struct promotenode *snap; 2646 int err; 2647 2648 err = dsl_dataset_hold_obj(dp, obj, tag, &ds); 2649 ASSERT(err != ENOENT); 2650 if (err != 0) 2651 return (err); 2652 2653 if (first_obj == 0) 2654 first_obj = dsl_dir_phys(ds->ds_dir)->dd_origin_obj; 2655 2656 snap = kmem_alloc(sizeof (*snap), KM_SLEEP); 2657 snap->ds = ds; 2658 list_insert_tail(l, snap); 2659 obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 2660 } 2661 2662 return (0); 2663 } 2664 2665 static int 2666 snaplist_space(list_t *l, uint64_t mintxg, uint64_t *spacep) 2667 { 2668 struct promotenode *snap; 2669 2670 *spacep = 0; 2671 for (snap = list_head(l); snap; snap = list_next(l, snap)) { 2672 uint64_t used, comp, uncomp; 2673 dsl_deadlist_space_range(&snap->ds->ds_deadlist, 2674 mintxg, UINT64_MAX, &used, &comp, &uncomp); 2675 *spacep += used; 2676 } 2677 return (0); 2678 } 2679 2680 static void 2681 snaplist_destroy(list_t *l, void *tag) 2682 { 2683 struct promotenode *snap; 2684 2685 if (l == NULL || !list_link_active(&l->list_head)) 2686 return; 2687 2688 while ((snap = list_tail(l)) != NULL) { 2689 list_remove(l, snap); 2690 dsl_dataset_rele(snap->ds, tag); 2691 kmem_free(snap, sizeof (*snap)); 2692 } 2693 list_destroy(l); 2694 } 2695 2696 static int 2697 promote_hold(dsl_dataset_promote_arg_t *ddpa, dsl_pool_t *dp, void *tag) 2698 { 2699 int error; 2700 dsl_dir_t *dd; 2701 struct promotenode *snap; 2702 2703 error = dsl_dataset_hold(dp, ddpa->ddpa_clonename, tag, 2704 &ddpa->ddpa_clone); 2705 if (error != 0) 2706 return (error); 2707 dd = ddpa->ddpa_clone->ds_dir; 2708 2709 if (ddpa->ddpa_clone->ds_is_snapshot || 2710 !dsl_dir_is_clone(dd)) { 2711 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2712 return (SET_ERROR(EINVAL)); 2713 } 2714 2715 error = snaplist_make(dp, 0, dsl_dir_phys(dd)->dd_origin_obj, 2716 &ddpa->shared_snaps, tag); 2717 if (error != 0) 2718 goto out; 2719 2720 error = snaplist_make(dp, 0, ddpa->ddpa_clone->ds_object, 2721 &ddpa->clone_snaps, tag); 2722 if (error != 0) 2723 goto out; 2724 2725 snap = list_head(&ddpa->shared_snaps); 2726 ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj); 2727 error = snaplist_make(dp, dsl_dir_phys(dd)->dd_origin_obj, 2728 dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj, 2729 &ddpa->origin_snaps, tag); 2730 if (error != 0) 2731 goto out; 2732 2733 if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) { 2734 error = dsl_dataset_hold_obj(dp, 2735 dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj, 2736 tag, &ddpa->origin_origin); 2737 if (error != 0) 2738 goto out; 2739 } 2740 out: 2741 if (error != 0) 2742 promote_rele(ddpa, tag); 2743 return (error); 2744 } 2745 2746 static void 2747 promote_rele(dsl_dataset_promote_arg_t *ddpa, void *tag) 2748 { 2749 snaplist_destroy(&ddpa->shared_snaps, tag); 2750 snaplist_destroy(&ddpa->clone_snaps, tag); 2751 snaplist_destroy(&ddpa->origin_snaps, tag); 2752 if (ddpa->origin_origin != NULL) 2753 dsl_dataset_rele(ddpa->origin_origin, tag); 2754 dsl_dataset_rele(ddpa->ddpa_clone, tag); 2755 } 2756 2757 /* 2758 * Promote a clone. 2759 * 2760 * If it fails due to a conflicting snapshot name, "conflsnap" will be filled 2761 * in with the name. (It must be at least ZFS_MAX_DATASET_NAME_LEN bytes long.) 2762 */ 2763 int 2764 dsl_dataset_promote(const char *name, char *conflsnap) 2765 { 2766 dsl_dataset_promote_arg_t ddpa = { 0 }; 2767 uint64_t numsnaps; 2768 int error; 2769 objset_t *os; 2770 2771 /* 2772 * We will modify space proportional to the number of 2773 * snapshots. Compute numsnaps. 2774 */ 2775 error = dmu_objset_hold(name, FTAG, &os); 2776 if (error != 0) 2777 return (error); 2778 error = zap_count(dmu_objset_pool(os)->dp_meta_objset, 2779 dsl_dataset_phys(dmu_objset_ds(os))->ds_snapnames_zapobj, 2780 &numsnaps); 2781 dmu_objset_rele(os, FTAG); 2782 if (error != 0) 2783 return (error); 2784 2785 ddpa.ddpa_clonename = name; 2786 ddpa.err_ds = conflsnap; 2787 ddpa.cr = CRED(); 2788 2789 return (dsl_sync_task(name, dsl_dataset_promote_check, 2790 dsl_dataset_promote_sync, &ddpa, 2791 2 + numsnaps, ZFS_SPACE_CHECK_RESERVED)); 2792 } 2793 2794 int 2795 dsl_dataset_clone_swap_check_impl(dsl_dataset_t *clone, 2796 dsl_dataset_t *origin_head, boolean_t force, void *owner, dmu_tx_t *tx) 2797 { 2798 int64_t unused_refres_delta; 2799 2800 /* they should both be heads */ 2801 if (clone->ds_is_snapshot || 2802 origin_head->ds_is_snapshot) 2803 return (SET_ERROR(EINVAL)); 2804 2805 /* if we are not forcing, the branch point should be just before them */ 2806 if (!force && clone->ds_prev != origin_head->ds_prev) 2807 return (SET_ERROR(EINVAL)); 2808 2809 /* clone should be the clone (unless they are unrelated) */ 2810 if (clone->ds_prev != NULL && 2811 clone->ds_prev != clone->ds_dir->dd_pool->dp_origin_snap && 2812 origin_head->ds_dir != clone->ds_prev->ds_dir) 2813 return (SET_ERROR(EINVAL)); 2814 2815 /* the clone should be a child of the origin */ 2816 if (clone->ds_dir->dd_parent != origin_head->ds_dir) 2817 return (SET_ERROR(EINVAL)); 2818 2819 /* origin_head shouldn't be modified unless 'force' */ 2820 if (!force && 2821 dsl_dataset_modified_since_snap(origin_head, origin_head->ds_prev)) 2822 return (SET_ERROR(ETXTBSY)); 2823 2824 /* origin_head should have no long holds (e.g. is not mounted) */ 2825 if (dsl_dataset_handoff_check(origin_head, owner, tx)) 2826 return (SET_ERROR(EBUSY)); 2827 2828 /* check amount of any unconsumed refreservation */ 2829 unused_refres_delta = 2830 (int64_t)MIN(origin_head->ds_reserved, 2831 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2832 (int64_t)MIN(origin_head->ds_reserved, 2833 dsl_dataset_phys(clone)->ds_unique_bytes); 2834 2835 if (unused_refres_delta > 0 && 2836 unused_refres_delta > 2837 dsl_dir_space_available(origin_head->ds_dir, NULL, 0, TRUE)) 2838 return (SET_ERROR(ENOSPC)); 2839 2840 /* clone can't be over the head's refquota */ 2841 if (origin_head->ds_quota != 0 && 2842 dsl_dataset_phys(clone)->ds_referenced_bytes > 2843 origin_head->ds_quota) 2844 return (SET_ERROR(EDQUOT)); 2845 2846 return (0); 2847 } 2848 2849 void 2850 dsl_dataset_clone_swap_sync_impl(dsl_dataset_t *clone, 2851 dsl_dataset_t *origin_head, dmu_tx_t *tx) 2852 { 2853 dsl_pool_t *dp = dmu_tx_pool(tx); 2854 int64_t unused_refres_delta; 2855 2856 ASSERT(clone->ds_reserved == 0); 2857 ASSERT(origin_head->ds_quota == 0 || 2858 dsl_dataset_phys(clone)->ds_unique_bytes <= origin_head->ds_quota); 2859 ASSERT3P(clone->ds_prev, ==, origin_head->ds_prev); 2860 2861 /* 2862 * Swap per-dataset feature flags. 2863 */ 2864 for (spa_feature_t f = 0; f < SPA_FEATURES; f++) { 2865 if (!(spa_feature_table[f].fi_flags & 2866 ZFEATURE_FLAG_PER_DATASET)) { 2867 ASSERT(!clone->ds_feature_inuse[f]); 2868 ASSERT(!origin_head->ds_feature_inuse[f]); 2869 continue; 2870 } 2871 2872 boolean_t clone_inuse = clone->ds_feature_inuse[f]; 2873 boolean_t origin_head_inuse = origin_head->ds_feature_inuse[f]; 2874 2875 if (clone_inuse) { 2876 dsl_dataset_deactivate_feature(clone->ds_object, f, tx); 2877 clone->ds_feature_inuse[f] = B_FALSE; 2878 } 2879 if (origin_head_inuse) { 2880 dsl_dataset_deactivate_feature(origin_head->ds_object, 2881 f, tx); 2882 origin_head->ds_feature_inuse[f] = B_FALSE; 2883 } 2884 if (clone_inuse) { 2885 dsl_dataset_activate_feature(origin_head->ds_object, 2886 f, tx); 2887 origin_head->ds_feature_inuse[f] = B_TRUE; 2888 } 2889 if (origin_head_inuse) { 2890 dsl_dataset_activate_feature(clone->ds_object, f, tx); 2891 clone->ds_feature_inuse[f] = B_TRUE; 2892 } 2893 } 2894 2895 dmu_buf_will_dirty(clone->ds_dbuf, tx); 2896 dmu_buf_will_dirty(origin_head->ds_dbuf, tx); 2897 2898 if (clone->ds_objset != NULL) { 2899 dmu_objset_evict(clone->ds_objset); 2900 clone->ds_objset = NULL; 2901 } 2902 2903 if (origin_head->ds_objset != NULL) { 2904 dmu_objset_evict(origin_head->ds_objset); 2905 origin_head->ds_objset = NULL; 2906 } 2907 2908 unused_refres_delta = 2909 (int64_t)MIN(origin_head->ds_reserved, 2910 dsl_dataset_phys(origin_head)->ds_unique_bytes) - 2911 (int64_t)MIN(origin_head->ds_reserved, 2912 dsl_dataset_phys(clone)->ds_unique_bytes); 2913 2914 /* 2915 * Reset origin's unique bytes, if it exists. 2916 */ 2917 if (clone->ds_prev) { 2918 dsl_dataset_t *origin = clone->ds_prev; 2919 uint64_t comp, uncomp; 2920 2921 dmu_buf_will_dirty(origin->ds_dbuf, tx); 2922 dsl_deadlist_space_range(&clone->ds_deadlist, 2923 dsl_dataset_phys(origin)->ds_prev_snap_txg, UINT64_MAX, 2924 &dsl_dataset_phys(origin)->ds_unique_bytes, &comp, &uncomp); 2925 } 2926 2927 /* swap blkptrs */ 2928 { 2929 blkptr_t tmp; 2930 tmp = dsl_dataset_phys(origin_head)->ds_bp; 2931 dsl_dataset_phys(origin_head)->ds_bp = 2932 dsl_dataset_phys(clone)->ds_bp; 2933 dsl_dataset_phys(clone)->ds_bp = tmp; 2934 } 2935 2936 /* set dd_*_bytes */ 2937 { 2938 int64_t dused, dcomp, duncomp; 2939 uint64_t cdl_used, cdl_comp, cdl_uncomp; 2940 uint64_t odl_used, odl_comp, odl_uncomp; 2941 2942 ASSERT3U(dsl_dir_phys(clone->ds_dir)-> 2943 dd_used_breakdown[DD_USED_SNAP], ==, 0); 2944 2945 dsl_deadlist_space(&clone->ds_deadlist, 2946 &cdl_used, &cdl_comp, &cdl_uncomp); 2947 dsl_deadlist_space(&origin_head->ds_deadlist, 2948 &odl_used, &odl_comp, &odl_uncomp); 2949 2950 dused = dsl_dataset_phys(clone)->ds_referenced_bytes + 2951 cdl_used - 2952 (dsl_dataset_phys(origin_head)->ds_referenced_bytes + 2953 odl_used); 2954 dcomp = dsl_dataset_phys(clone)->ds_compressed_bytes + 2955 cdl_comp - 2956 (dsl_dataset_phys(origin_head)->ds_compressed_bytes + 2957 odl_comp); 2958 duncomp = dsl_dataset_phys(clone)->ds_uncompressed_bytes + 2959 cdl_uncomp - 2960 (dsl_dataset_phys(origin_head)->ds_uncompressed_bytes + 2961 odl_uncomp); 2962 2963 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_HEAD, 2964 dused, dcomp, duncomp, tx); 2965 dsl_dir_diduse_space(clone->ds_dir, DD_USED_HEAD, 2966 -dused, -dcomp, -duncomp, tx); 2967 2968 /* 2969 * The difference in the space used by snapshots is the 2970 * difference in snapshot space due to the head's 2971 * deadlist (since that's the only thing that's 2972 * changing that affects the snapused). 2973 */ 2974 dsl_deadlist_space_range(&clone->ds_deadlist, 2975 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2976 &cdl_used, &cdl_comp, &cdl_uncomp); 2977 dsl_deadlist_space_range(&origin_head->ds_deadlist, 2978 origin_head->ds_dir->dd_origin_txg, UINT64_MAX, 2979 &odl_used, &odl_comp, &odl_uncomp); 2980 dsl_dir_transfer_space(origin_head->ds_dir, cdl_used - odl_used, 2981 DD_USED_HEAD, DD_USED_SNAP, tx); 2982 } 2983 2984 /* swap ds_*_bytes */ 2985 SWITCH64(dsl_dataset_phys(origin_head)->ds_referenced_bytes, 2986 dsl_dataset_phys(clone)->ds_referenced_bytes); 2987 SWITCH64(dsl_dataset_phys(origin_head)->ds_compressed_bytes, 2988 dsl_dataset_phys(clone)->ds_compressed_bytes); 2989 SWITCH64(dsl_dataset_phys(origin_head)->ds_uncompressed_bytes, 2990 dsl_dataset_phys(clone)->ds_uncompressed_bytes); 2991 SWITCH64(dsl_dataset_phys(origin_head)->ds_unique_bytes, 2992 dsl_dataset_phys(clone)->ds_unique_bytes); 2993 2994 /* apply any parent delta for change in unconsumed refreservation */ 2995 dsl_dir_diduse_space(origin_head->ds_dir, DD_USED_REFRSRV, 2996 unused_refres_delta, 0, 0, tx); 2997 2998 /* 2999 * Swap deadlists. 3000 */ 3001 dsl_deadlist_close(&clone->ds_deadlist); 3002 dsl_deadlist_close(&origin_head->ds_deadlist); 3003 SWITCH64(dsl_dataset_phys(origin_head)->ds_deadlist_obj, 3004 dsl_dataset_phys(clone)->ds_deadlist_obj); 3005 dsl_deadlist_open(&clone->ds_deadlist, dp->dp_meta_objset, 3006 dsl_dataset_phys(clone)->ds_deadlist_obj); 3007 dsl_deadlist_open(&origin_head->ds_deadlist, dp->dp_meta_objset, 3008 dsl_dataset_phys(origin_head)->ds_deadlist_obj); 3009 3010 dsl_scan_ds_clone_swapped(origin_head, clone, tx); 3011 3012 spa_history_log_internal_ds(clone, "clone swap", tx, 3013 "parent=%s", origin_head->ds_dir->dd_myname); 3014 } 3015 3016 /* 3017 * Given a pool name and a dataset object number in that pool, 3018 * return the name of that dataset. 3019 */ 3020 int 3021 dsl_dsobj_to_dsname(char *pname, uint64_t obj, char *buf) 3022 { 3023 dsl_pool_t *dp; 3024 dsl_dataset_t *ds; 3025 int error; 3026 3027 error = dsl_pool_hold(pname, FTAG, &dp); 3028 if (error != 0) 3029 return (error); 3030 3031 error = dsl_dataset_hold_obj(dp, obj, FTAG, &ds); 3032 if (error == 0) { 3033 dsl_dataset_name(ds, buf); 3034 dsl_dataset_rele(ds, FTAG); 3035 } 3036 dsl_pool_rele(dp, FTAG); 3037 3038 return (error); 3039 } 3040 3041 int 3042 dsl_dataset_check_quota(dsl_dataset_t *ds, boolean_t check_quota, 3043 uint64_t asize, uint64_t inflight, uint64_t *used, uint64_t *ref_rsrv) 3044 { 3045 int error = 0; 3046 3047 ASSERT3S(asize, >, 0); 3048 3049 /* 3050 * *ref_rsrv is the portion of asize that will come from any 3051 * unconsumed refreservation space. 3052 */ 3053 *ref_rsrv = 0; 3054 3055 mutex_enter(&ds->ds_lock); 3056 /* 3057 * Make a space adjustment for reserved bytes. 3058 */ 3059 if (ds->ds_reserved > dsl_dataset_phys(ds)->ds_unique_bytes) { 3060 ASSERT3U(*used, >=, 3061 ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3062 *used -= 3063 (ds->ds_reserved - dsl_dataset_phys(ds)->ds_unique_bytes); 3064 *ref_rsrv = 3065 asize - MIN(asize, parent_delta(ds, asize + inflight)); 3066 } 3067 3068 if (!check_quota || ds->ds_quota == 0) { 3069 mutex_exit(&ds->ds_lock); 3070 return (0); 3071 } 3072 /* 3073 * If they are requesting more space, and our current estimate 3074 * is over quota, they get to try again unless the actual 3075 * on-disk is over quota and there are no pending changes (which 3076 * may free up space for us). 3077 */ 3078 if (dsl_dataset_phys(ds)->ds_referenced_bytes + inflight >= 3079 ds->ds_quota) { 3080 if (inflight > 0 || 3081 dsl_dataset_phys(ds)->ds_referenced_bytes < ds->ds_quota) 3082 error = SET_ERROR(ERESTART); 3083 else 3084 error = SET_ERROR(EDQUOT); 3085 } 3086 mutex_exit(&ds->ds_lock); 3087 3088 return (error); 3089 } 3090 3091 typedef struct dsl_dataset_set_qr_arg { 3092 const char *ddsqra_name; 3093 zprop_source_t ddsqra_source; 3094 uint64_t ddsqra_value; 3095 } dsl_dataset_set_qr_arg_t; 3096 3097 3098 /* ARGSUSED */ 3099 static int 3100 dsl_dataset_set_refquota_check(void *arg, dmu_tx_t *tx) 3101 { 3102 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3103 dsl_pool_t *dp = dmu_tx_pool(tx); 3104 dsl_dataset_t *ds; 3105 int error; 3106 uint64_t newval; 3107 3108 if (spa_version(dp->dp_spa) < SPA_VERSION_REFQUOTA) 3109 return (SET_ERROR(ENOTSUP)); 3110 3111 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3112 if (error != 0) 3113 return (error); 3114 3115 if (ds->ds_is_snapshot) { 3116 dsl_dataset_rele(ds, FTAG); 3117 return (SET_ERROR(EINVAL)); 3118 } 3119 3120 error = dsl_prop_predict(ds->ds_dir, 3121 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3122 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3123 if (error != 0) { 3124 dsl_dataset_rele(ds, FTAG); 3125 return (error); 3126 } 3127 3128 if (newval == 0) { 3129 dsl_dataset_rele(ds, FTAG); 3130 return (0); 3131 } 3132 3133 if (newval < dsl_dataset_phys(ds)->ds_referenced_bytes || 3134 newval < ds->ds_reserved) { 3135 dsl_dataset_rele(ds, FTAG); 3136 return (SET_ERROR(ENOSPC)); 3137 } 3138 3139 dsl_dataset_rele(ds, FTAG); 3140 return (0); 3141 } 3142 3143 static void 3144 dsl_dataset_set_refquota_sync(void *arg, dmu_tx_t *tx) 3145 { 3146 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3147 dsl_pool_t *dp = dmu_tx_pool(tx); 3148 dsl_dataset_t *ds; 3149 uint64_t newval; 3150 3151 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3152 3153 dsl_prop_set_sync_impl(ds, 3154 zfs_prop_to_name(ZFS_PROP_REFQUOTA), 3155 ddsqra->ddsqra_source, sizeof (ddsqra->ddsqra_value), 1, 3156 &ddsqra->ddsqra_value, tx); 3157 3158 VERIFY0(dsl_prop_get_int_ds(ds, 3159 zfs_prop_to_name(ZFS_PROP_REFQUOTA), &newval)); 3160 3161 if (ds->ds_quota != newval) { 3162 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3163 ds->ds_quota = newval; 3164 } 3165 dsl_dataset_rele(ds, FTAG); 3166 } 3167 3168 int 3169 dsl_dataset_set_refquota(const char *dsname, zprop_source_t source, 3170 uint64_t refquota) 3171 { 3172 dsl_dataset_set_qr_arg_t ddsqra; 3173 3174 ddsqra.ddsqra_name = dsname; 3175 ddsqra.ddsqra_source = source; 3176 ddsqra.ddsqra_value = refquota; 3177 3178 return (dsl_sync_task(dsname, dsl_dataset_set_refquota_check, 3179 dsl_dataset_set_refquota_sync, &ddsqra, 0, ZFS_SPACE_CHECK_NONE)); 3180 } 3181 3182 static int 3183 dsl_dataset_set_refreservation_check(void *arg, dmu_tx_t *tx) 3184 { 3185 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3186 dsl_pool_t *dp = dmu_tx_pool(tx); 3187 dsl_dataset_t *ds; 3188 int error; 3189 uint64_t newval, unique; 3190 3191 if (spa_version(dp->dp_spa) < SPA_VERSION_REFRESERVATION) 3192 return (SET_ERROR(ENOTSUP)); 3193 3194 error = dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds); 3195 if (error != 0) 3196 return (error); 3197 3198 if (ds->ds_is_snapshot) { 3199 dsl_dataset_rele(ds, FTAG); 3200 return (SET_ERROR(EINVAL)); 3201 } 3202 3203 error = dsl_prop_predict(ds->ds_dir, 3204 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3205 ddsqra->ddsqra_source, ddsqra->ddsqra_value, &newval); 3206 if (error != 0) { 3207 dsl_dataset_rele(ds, FTAG); 3208 return (error); 3209 } 3210 3211 /* 3212 * If we are doing the preliminary check in open context, the 3213 * space estimates may be inaccurate. 3214 */ 3215 if (!dmu_tx_is_syncing(tx)) { 3216 dsl_dataset_rele(ds, FTAG); 3217 return (0); 3218 } 3219 3220 mutex_enter(&ds->ds_lock); 3221 if (!DS_UNIQUE_IS_ACCURATE(ds)) 3222 dsl_dataset_recalc_head_uniq(ds); 3223 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3224 mutex_exit(&ds->ds_lock); 3225 3226 if (MAX(unique, newval) > MAX(unique, ds->ds_reserved)) { 3227 uint64_t delta = MAX(unique, newval) - 3228 MAX(unique, ds->ds_reserved); 3229 3230 if (delta > 3231 dsl_dir_space_available(ds->ds_dir, NULL, 0, B_TRUE) || 3232 (ds->ds_quota > 0 && newval > ds->ds_quota)) { 3233 dsl_dataset_rele(ds, FTAG); 3234 return (SET_ERROR(ENOSPC)); 3235 } 3236 } 3237 3238 dsl_dataset_rele(ds, FTAG); 3239 return (0); 3240 } 3241 3242 void 3243 dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds, 3244 zprop_source_t source, uint64_t value, dmu_tx_t *tx) 3245 { 3246 uint64_t newval; 3247 uint64_t unique; 3248 int64_t delta; 3249 3250 dsl_prop_set_sync_impl(ds, zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 3251 source, sizeof (value), 1, &value, tx); 3252 3253 VERIFY0(dsl_prop_get_int_ds(ds, 3254 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &newval)); 3255 3256 dmu_buf_will_dirty(ds->ds_dbuf, tx); 3257 mutex_enter(&ds->ds_dir->dd_lock); 3258 mutex_enter(&ds->ds_lock); 3259 ASSERT(DS_UNIQUE_IS_ACCURATE(ds)); 3260 unique = dsl_dataset_phys(ds)->ds_unique_bytes; 3261 delta = MAX(0, (int64_t)(newval - unique)) - 3262 MAX(0, (int64_t)(ds->ds_reserved - unique)); 3263 ds->ds_reserved = newval; 3264 mutex_exit(&ds->ds_lock); 3265 3266 dsl_dir_diduse_space(ds->ds_dir, DD_USED_REFRSRV, delta, 0, 0, tx); 3267 mutex_exit(&ds->ds_dir->dd_lock); 3268 } 3269 3270 static void 3271 dsl_dataset_set_refreservation_sync(void *arg, dmu_tx_t *tx) 3272 { 3273 dsl_dataset_set_qr_arg_t *ddsqra = arg; 3274 dsl_pool_t *dp = dmu_tx_pool(tx); 3275 dsl_dataset_t *ds; 3276 3277 VERIFY0(dsl_dataset_hold(dp, ddsqra->ddsqra_name, FTAG, &ds)); 3278 dsl_dataset_set_refreservation_sync_impl(ds, 3279 ddsqra->ddsqra_source, ddsqra->ddsqra_value, tx); 3280 dsl_dataset_rele(ds, FTAG); 3281 } 3282 3283 int 3284 dsl_dataset_set_refreservation(const char *dsname, zprop_source_t source, 3285 uint64_t refreservation) 3286 { 3287 dsl_dataset_set_qr_arg_t ddsqra; 3288 3289 ddsqra.ddsqra_name = dsname; 3290 ddsqra.ddsqra_source = source; 3291 ddsqra.ddsqra_value = refreservation; 3292 3293 return (dsl_sync_task(dsname, dsl_dataset_set_refreservation_check, 3294 dsl_dataset_set_refreservation_sync, &ddsqra, 3295 0, ZFS_SPACE_CHECK_NONE)); 3296 } 3297 3298 /* 3299 * Return (in *usedp) the amount of space written in new that is not 3300 * present in oldsnap. New may be a snapshot or the head. Old must be 3301 * a snapshot before new, in new's filesystem (or its origin). If not then 3302 * fail and return EINVAL. 3303 * 3304 * The written space is calculated by considering two components: First, we 3305 * ignore any freed space, and calculate the written as new's used space 3306 * minus old's used space. Next, we add in the amount of space that was freed 3307 * between the two snapshots, thus reducing new's used space relative to old's. 3308 * Specifically, this is the space that was born before old->ds_creation_txg, 3309 * and freed before new (ie. on new's deadlist or a previous deadlist). 3310 * 3311 * space freed [---------------------] 3312 * snapshots ---O-------O--------O-------O------ 3313 * oldsnap new 3314 */ 3315 int 3316 dsl_dataset_space_written(dsl_dataset_t *oldsnap, dsl_dataset_t *new, 3317 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3318 { 3319 int err = 0; 3320 uint64_t snapobj; 3321 dsl_pool_t *dp = new->ds_dir->dd_pool; 3322 3323 ASSERT(dsl_pool_config_held(dp)); 3324 3325 *usedp = 0; 3326 *usedp += dsl_dataset_phys(new)->ds_referenced_bytes; 3327 *usedp -= dsl_dataset_phys(oldsnap)->ds_referenced_bytes; 3328 3329 *compp = 0; 3330 *compp += dsl_dataset_phys(new)->ds_compressed_bytes; 3331 *compp -= dsl_dataset_phys(oldsnap)->ds_compressed_bytes; 3332 3333 *uncompp = 0; 3334 *uncompp += dsl_dataset_phys(new)->ds_uncompressed_bytes; 3335 *uncompp -= dsl_dataset_phys(oldsnap)->ds_uncompressed_bytes; 3336 3337 snapobj = new->ds_object; 3338 while (snapobj != oldsnap->ds_object) { 3339 dsl_dataset_t *snap; 3340 uint64_t used, comp, uncomp; 3341 3342 if (snapobj == new->ds_object) { 3343 snap = new; 3344 } else { 3345 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap); 3346 if (err != 0) 3347 break; 3348 } 3349 3350 if (dsl_dataset_phys(snap)->ds_prev_snap_txg == 3351 dsl_dataset_phys(oldsnap)->ds_creation_txg) { 3352 /* 3353 * The blocks in the deadlist can not be born after 3354 * ds_prev_snap_txg, so get the whole deadlist space, 3355 * which is more efficient (especially for old-format 3356 * deadlists). Unfortunately the deadlist code 3357 * doesn't have enough information to make this 3358 * optimization itself. 3359 */ 3360 dsl_deadlist_space(&snap->ds_deadlist, 3361 &used, &comp, &uncomp); 3362 } else { 3363 dsl_deadlist_space_range(&snap->ds_deadlist, 3364 0, dsl_dataset_phys(oldsnap)->ds_creation_txg, 3365 &used, &comp, &uncomp); 3366 } 3367 *usedp += used; 3368 *compp += comp; 3369 *uncompp += uncomp; 3370 3371 /* 3372 * If we get to the beginning of the chain of snapshots 3373 * (ds_prev_snap_obj == 0) before oldsnap, then oldsnap 3374 * was not a snapshot of/before new. 3375 */ 3376 snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj; 3377 if (snap != new) 3378 dsl_dataset_rele(snap, FTAG); 3379 if (snapobj == 0) { 3380 err = SET_ERROR(EINVAL); 3381 break; 3382 } 3383 3384 } 3385 return (err); 3386 } 3387 3388 /* 3389 * Return (in *usedp) the amount of space that will be reclaimed if firstsnap, 3390 * lastsnap, and all snapshots in between are deleted. 3391 * 3392 * blocks that would be freed [---------------------------] 3393 * snapshots ---O-------O--------O-------O--------O 3394 * firstsnap lastsnap 3395 * 3396 * This is the set of blocks that were born after the snap before firstsnap, 3397 * (birth > firstsnap->prev_snap_txg) and died before the snap after the 3398 * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist). 3399 * We calculate this by iterating over the relevant deadlists (from the snap 3400 * after lastsnap, backward to the snap after firstsnap), summing up the 3401 * space on the deadlist that was born after the snap before firstsnap. 3402 */ 3403 int 3404 dsl_dataset_space_wouldfree(dsl_dataset_t *firstsnap, 3405 dsl_dataset_t *lastsnap, 3406 uint64_t *usedp, uint64_t *compp, uint64_t *uncompp) 3407 { 3408 int err = 0; 3409 uint64_t snapobj; 3410 dsl_pool_t *dp = firstsnap->ds_dir->dd_pool; 3411 3412 ASSERT(firstsnap->ds_is_snapshot); 3413 ASSERT(lastsnap->ds_is_snapshot); 3414 3415 /* 3416 * Check that the snapshots are in the same dsl_dir, and firstsnap 3417 * is before lastsnap. 3418 */ 3419 if (firstsnap->ds_dir != lastsnap->ds_dir || 3420 dsl_dataset_phys(firstsnap)->ds_creation_txg > 3421 dsl_dataset_phys(lastsnap)->ds_creation_txg) 3422 return (SET_ERROR(EINVAL)); 3423 3424 *usedp = *compp = *uncompp = 0; 3425 3426 snapobj = dsl_dataset_phys(lastsnap)->ds_next_snap_obj; 3427 while (snapobj != firstsnap->ds_object) { 3428 dsl_dataset_t *ds; 3429 uint64_t used, comp, uncomp; 3430 3431 err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &ds); 3432 if (err != 0) 3433 break; 3434 3435 dsl_deadlist_space_range(&ds->ds_deadlist, 3436 dsl_dataset_phys(firstsnap)->ds_prev_snap_txg, UINT64_MAX, 3437 &used, &comp, &uncomp); 3438 *usedp += used; 3439 *compp += comp; 3440 *uncompp += uncomp; 3441 3442 snapobj = dsl_dataset_phys(ds)->ds_prev_snap_obj; 3443 ASSERT3U(snapobj, !=, 0); 3444 dsl_dataset_rele(ds, FTAG); 3445 } 3446 return (err); 3447 } 3448 3449 /* 3450 * Return TRUE if 'earlier' is an earlier snapshot in 'later's timeline. 3451 * For example, they could both be snapshots of the same filesystem, and 3452 * 'earlier' is before 'later'. Or 'earlier' could be the origin of 3453 * 'later's filesystem. Or 'earlier' could be an older snapshot in the origin's 3454 * filesystem. Or 'earlier' could be the origin's origin. 3455 * 3456 * If non-zero, earlier_txg is used instead of earlier's ds_creation_txg. 3457 */ 3458 boolean_t 3459 dsl_dataset_is_before(dsl_dataset_t *later, dsl_dataset_t *earlier, 3460 uint64_t earlier_txg) 3461 { 3462 dsl_pool_t *dp = later->ds_dir->dd_pool; 3463 int error; 3464 boolean_t ret; 3465 3466 ASSERT(dsl_pool_config_held(dp)); 3467 ASSERT(earlier->ds_is_snapshot || earlier_txg != 0); 3468 3469 if (earlier_txg == 0) 3470 earlier_txg = dsl_dataset_phys(earlier)->ds_creation_txg; 3471 3472 if (later->ds_is_snapshot && 3473 earlier_txg >= dsl_dataset_phys(later)->ds_creation_txg) 3474 return (B_FALSE); 3475 3476 if (later->ds_dir == earlier->ds_dir) 3477 return (B_TRUE); 3478 if (!dsl_dir_is_clone(later->ds_dir)) 3479 return (B_FALSE); 3480 3481 if (dsl_dir_phys(later->ds_dir)->dd_origin_obj == earlier->ds_object) 3482 return (B_TRUE); 3483 dsl_dataset_t *origin; 3484 error = dsl_dataset_hold_obj(dp, 3485 dsl_dir_phys(later->ds_dir)->dd_origin_obj, FTAG, &origin); 3486 if (error != 0) 3487 return (B_FALSE); 3488 ret = dsl_dataset_is_before(origin, earlier, earlier_txg); 3489 dsl_dataset_rele(origin, FTAG); 3490 return (ret); 3491 } 3492 3493 void 3494 dsl_dataset_zapify(dsl_dataset_t *ds, dmu_tx_t *tx) 3495 { 3496 objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset; 3497 dmu_object_zapify(mos, ds->ds_object, DMU_OT_DSL_DATASET, tx); 3498 } 3499 3500 boolean_t 3501 dsl_dataset_is_zapified(dsl_dataset_t *ds) 3502 { 3503 dmu_object_info_t doi; 3504 3505 dmu_object_info_from_db(ds->ds_dbuf, &doi); 3506 return (doi.doi_type == DMU_OTN_ZAP_METADATA); 3507 } 3508 3509 boolean_t 3510 dsl_dataset_has_resume_receive_state(dsl_dataset_t *ds) 3511 { 3512 return (dsl_dataset_is_zapified(ds) && 3513 zap_contains(ds->ds_dir->dd_pool->dp_meta_objset, 3514 ds->ds_object, DS_FIELD_RESUME_TOGUID) == 0); 3515 } 3516