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