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