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