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