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 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2012, 2017 by Delphix. All rights reserved. 25 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 26 * Copyright 2019 Joyent, Inc. 27 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 28 * Copyright (c) 2015, STRATO AG, Inc. All rights reserved. 29 * Copyright (c) 2014 Integros [integros.com] 30 * Copyright 2017 Nexenta Systems, Inc. 31 * Copyright (c) 2017 Open-E, Inc. All Rights Reserved. 32 */ 33 34 /* Portions Copyright 2010 Robert Milkowski */ 35 36 #include <sys/zfeature.h> 37 #include <sys/cred.h> 38 #include <sys/zfs_context.h> 39 #include <sys/dmu_objset.h> 40 #include <sys/dsl_dir.h> 41 #include <sys/dsl_dataset.h> 42 #include <sys/dsl_prop.h> 43 #include <sys/dsl_pool.h> 44 #include <sys/dsl_synctask.h> 45 #include <sys/dsl_deleg.h> 46 #include <sys/dnode.h> 47 #include <sys/dbuf.h> 48 #include <sys/zvol.h> 49 #include <sys/dmu_tx.h> 50 #include <sys/zap.h> 51 #include <sys/zil.h> 52 #include <sys/dmu_impl.h> 53 #include <sys/zfs_ioctl.h> 54 #include <sys/sa.h> 55 #include <sys/zfs_onexit.h> 56 #include <sys/dsl_destroy.h> 57 #include <sys/vdev.h> 58 #include <sys/zfeature.h> 59 #include <sys/spa_impl.h> 60 #include <sys/dmu_recv.h> 61 #include <sys/zfs_project.h> 62 #include "zfs_namecheck.h" 63 64 /* 65 * Needed to close a window in dnode_move() that allows the objset to be freed 66 * before it can be safely accessed. 67 */ 68 krwlock_t os_lock; 69 70 /* 71 * Tunable to overwrite the maximum number of threads for the parallization 72 * of dmu_objset_find_dp, needed to speed up the import of pools with many 73 * datasets. 74 * Default is 4 times the number of leaf vdevs. 75 */ 76 int dmu_find_threads = 0; 77 78 /* 79 * Backfill lower metadnode objects after this many have been freed. 80 * Backfilling negatively impacts object creation rates, so only do it 81 * if there are enough holes to fill. 82 */ 83 int dmu_rescan_dnode_threshold = 131072; 84 85 static char *upgrade_tag = "upgrade_tag"; 86 87 static void dmu_objset_find_dp_cb(void *arg); 88 89 static void dmu_objset_upgrade(objset_t *os, dmu_objset_upgrade_cb_t cb); 90 static void dmu_objset_upgrade_stop(objset_t *os); 91 92 void 93 dmu_objset_init(void) 94 { 95 rw_init(&os_lock, NULL, RW_DEFAULT, NULL); 96 } 97 98 void 99 dmu_objset_fini(void) 100 { 101 rw_destroy(&os_lock); 102 } 103 104 spa_t * 105 dmu_objset_spa(objset_t *os) 106 { 107 return (os->os_spa); 108 } 109 110 zilog_t * 111 dmu_objset_zil(objset_t *os) 112 { 113 return (os->os_zil); 114 } 115 116 dsl_pool_t * 117 dmu_objset_pool(objset_t *os) 118 { 119 dsl_dataset_t *ds; 120 121 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir) 122 return (ds->ds_dir->dd_pool); 123 else 124 return (spa_get_dsl(os->os_spa)); 125 } 126 127 dsl_dataset_t * 128 dmu_objset_ds(objset_t *os) 129 { 130 return (os->os_dsl_dataset); 131 } 132 133 dmu_objset_type_t 134 dmu_objset_type(objset_t *os) 135 { 136 return (os->os_phys->os_type); 137 } 138 139 void 140 dmu_objset_name(objset_t *os, char *buf) 141 { 142 dsl_dataset_name(os->os_dsl_dataset, buf); 143 } 144 145 uint64_t 146 dmu_objset_id(objset_t *os) 147 { 148 dsl_dataset_t *ds = os->os_dsl_dataset; 149 150 return (ds ? ds->ds_object : 0); 151 } 152 153 uint64_t 154 dmu_objset_dnodesize(objset_t *os) 155 { 156 return (os->os_dnodesize); 157 } 158 159 zfs_sync_type_t 160 dmu_objset_syncprop(objset_t *os) 161 { 162 return (os->os_sync); 163 } 164 165 zfs_logbias_op_t 166 dmu_objset_logbias(objset_t *os) 167 { 168 return (os->os_logbias); 169 } 170 171 static void 172 checksum_changed_cb(void *arg, uint64_t newval) 173 { 174 objset_t *os = arg; 175 176 /* 177 * Inheritance should have been done by now. 178 */ 179 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 180 181 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 182 } 183 184 static void 185 compression_changed_cb(void *arg, uint64_t newval) 186 { 187 objset_t *os = arg; 188 189 /* 190 * Inheritance and range checking should have been done by now. 191 */ 192 ASSERT(newval != ZIO_COMPRESS_INHERIT); 193 194 os->os_compress = zio_compress_select(os->os_spa, newval, 195 ZIO_COMPRESS_ON); 196 } 197 198 static void 199 copies_changed_cb(void *arg, uint64_t newval) 200 { 201 objset_t *os = arg; 202 203 /* 204 * Inheritance and range checking should have been done by now. 205 */ 206 ASSERT(newval > 0); 207 ASSERT(newval <= spa_max_replication(os->os_spa)); 208 209 os->os_copies = newval; 210 } 211 212 static void 213 dedup_changed_cb(void *arg, uint64_t newval) 214 { 215 objset_t *os = arg; 216 spa_t *spa = os->os_spa; 217 enum zio_checksum checksum; 218 219 /* 220 * Inheritance should have been done by now. 221 */ 222 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 223 224 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF); 225 226 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK; 227 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY); 228 } 229 230 static void 231 primary_cache_changed_cb(void *arg, uint64_t newval) 232 { 233 objset_t *os = arg; 234 235 /* 236 * Inheritance and range checking should have been done by now. 237 */ 238 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 239 newval == ZFS_CACHE_METADATA); 240 241 os->os_primary_cache = newval; 242 } 243 244 static void 245 secondary_cache_changed_cb(void *arg, uint64_t newval) 246 { 247 objset_t *os = arg; 248 249 /* 250 * Inheritance and range checking should have been done by now. 251 */ 252 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 253 newval == ZFS_CACHE_METADATA); 254 255 os->os_secondary_cache = newval; 256 } 257 258 static void 259 sync_changed_cb(void *arg, uint64_t newval) 260 { 261 objset_t *os = arg; 262 263 /* 264 * Inheritance and range checking should have been done by now. 265 */ 266 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS || 267 newval == ZFS_SYNC_DISABLED); 268 269 os->os_sync = newval; 270 if (os->os_zil) 271 zil_set_sync(os->os_zil, newval); 272 } 273 274 static void 275 redundant_metadata_changed_cb(void *arg, uint64_t newval) 276 { 277 objset_t *os = arg; 278 279 /* 280 * Inheritance and range checking should have been done by now. 281 */ 282 ASSERT(newval == ZFS_REDUNDANT_METADATA_ALL || 283 newval == ZFS_REDUNDANT_METADATA_MOST); 284 285 os->os_redundant_metadata = newval; 286 } 287 288 static void 289 dnodesize_changed_cb(void *arg, uint64_t newval) 290 { 291 objset_t *os = arg; 292 293 switch (newval) { 294 case ZFS_DNSIZE_LEGACY: 295 os->os_dnodesize = DNODE_MIN_SIZE; 296 break; 297 case ZFS_DNSIZE_AUTO: 298 /* 299 * Choose a dnode size that will work well for most 300 * workloads if the user specified "auto". Future code 301 * improvements could dynamically select a dnode size 302 * based on observed workload patterns. 303 */ 304 os->os_dnodesize = DNODE_MIN_SIZE * 2; 305 break; 306 case ZFS_DNSIZE_1K: 307 case ZFS_DNSIZE_2K: 308 case ZFS_DNSIZE_4K: 309 case ZFS_DNSIZE_8K: 310 case ZFS_DNSIZE_16K: 311 os->os_dnodesize = newval; 312 break; 313 } 314 } 315 316 static void 317 smallblk_changed_cb(void *arg, uint64_t newval) 318 { 319 objset_t *os = arg; 320 321 /* 322 * Inheritance and range checking should have been done by now. 323 */ 324 ASSERT(newval <= SPA_OLD_MAXBLOCKSIZE); 325 ASSERT(ISP2(newval)); 326 327 os->os_zpl_special_smallblock = newval; 328 } 329 330 static void 331 logbias_changed_cb(void *arg, uint64_t newval) 332 { 333 objset_t *os = arg; 334 335 ASSERT(newval == ZFS_LOGBIAS_LATENCY || 336 newval == ZFS_LOGBIAS_THROUGHPUT); 337 os->os_logbias = newval; 338 if (os->os_zil) 339 zil_set_logbias(os->os_zil, newval); 340 } 341 342 static void 343 recordsize_changed_cb(void *arg, uint64_t newval) 344 { 345 objset_t *os = arg; 346 347 os->os_recordsize = newval; 348 } 349 350 void 351 dmu_objset_byteswap(void *buf, size_t size) 352 { 353 objset_phys_t *osp = buf; 354 355 ASSERT(size == OBJSET_PHYS_SIZE_V1 || size == OBJSET_PHYS_SIZE_V2 || 356 size == sizeof (objset_phys_t)); 357 dnode_byteswap(&osp->os_meta_dnode); 358 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 359 osp->os_type = BSWAP_64(osp->os_type); 360 osp->os_flags = BSWAP_64(osp->os_flags); 361 if (size >= OBJSET_PHYS_SIZE_V2) { 362 dnode_byteswap(&osp->os_userused_dnode); 363 dnode_byteswap(&osp->os_groupused_dnode); 364 if (size >= sizeof (objset_phys_t)) 365 dnode_byteswap(&osp->os_projectused_dnode); 366 } 367 } 368 369 /* 370 * The hash is a CRC-based hash of the objset_t pointer and the object number. 371 */ 372 static uint64_t 373 dnode_hash(const objset_t *os, uint64_t obj) 374 { 375 uintptr_t osv = (uintptr_t)os; 376 uint64_t crc = -1ULL; 377 378 ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 379 /* 380 * The low 6 bits of the pointer don't have much entropy, because 381 * the objset_t is larger than 2^6 bytes long. 382 */ 383 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 384 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 385 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 386 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 16)) & 0xFF]; 387 388 crc ^= (osv>>14) ^ (obj>>24); 389 390 return (crc); 391 } 392 393 unsigned int 394 dnode_multilist_index_func(multilist_t *ml, void *obj) 395 { 396 dnode_t *dn = obj; 397 return (dnode_hash(dn->dn_objset, dn->dn_object) % 398 multilist_get_num_sublists(ml)); 399 } 400 401 /* 402 * Instantiates the objset_t in-memory structure corresponding to the 403 * objset_phys_t that's pointed to by the specified blkptr_t. 404 */ 405 int 406 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 407 objset_t **osp) 408 { 409 objset_t *os; 410 int i, err; 411 412 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 413 414 #if 0 415 /* 416 * The $ORIGIN dataset (if it exists) doesn't have an associated 417 * objset, so there's no reason to open it. The $ORIGIN dataset 418 * will not exist on pools older than SPA_VERSION_ORIGIN. 419 */ 420 if (ds != NULL && spa_get_dsl(spa) != NULL && 421 spa_get_dsl(spa)->dp_origin_snap != NULL) { 422 ASSERT3P(ds->ds_dir, !=, 423 spa_get_dsl(spa)->dp_origin_snap->ds_dir); 424 } 425 #endif 426 427 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP); 428 os->os_dsl_dataset = ds; 429 os->os_spa = spa; 430 os->os_rootbp = bp; 431 if (!BP_IS_HOLE(os->os_rootbp)) { 432 arc_flags_t aflags = ARC_FLAG_WAIT; 433 zbookmark_phys_t zb; 434 int size; 435 enum zio_flag zio_flags = ZIO_FLAG_CANFAIL; 436 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 437 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 438 439 if (DMU_OS_IS_L2CACHEABLE(os)) 440 aflags |= ARC_FLAG_L2CACHE; 441 442 if (ds != NULL && ds->ds_dir->dd_crypto_obj != 0) { 443 ASSERT3U(BP_GET_COMPRESS(bp), ==, ZIO_COMPRESS_OFF); 444 ASSERT(BP_IS_AUTHENTICATED(bp)); 445 zio_flags |= ZIO_FLAG_RAW; 446 } 447 448 dprintf_bp(os->os_rootbp, "reading %s", ""); 449 err = arc_read(NULL, spa, os->os_rootbp, 450 arc_getbuf_func, &os->os_phys_buf, 451 ZIO_PRIORITY_SYNC_READ, zio_flags, &aflags, &zb); 452 if (err != 0) { 453 kmem_free(os, sizeof (objset_t)); 454 /* convert checksum errors into IO errors */ 455 if (err == ECKSUM) 456 err = SET_ERROR(EIO); 457 return (err); 458 } 459 460 if (spa_version(spa) < SPA_VERSION_USERSPACE) 461 size = OBJSET_PHYS_SIZE_V1; 462 else if (!spa_feature_is_enabled(spa, 463 SPA_FEATURE_PROJECT_QUOTA)) 464 size = OBJSET_PHYS_SIZE_V2; 465 else 466 size = sizeof (objset_phys_t); 467 468 /* Increase the blocksize if we are permitted. */ 469 if (arc_buf_size(os->os_phys_buf) < size) { 470 arc_buf_t *buf = arc_alloc_buf(spa, &os->os_phys_buf, 471 ARC_BUFC_METADATA, size); 472 bzero(buf->b_data, size); 473 bcopy(os->os_phys_buf->b_data, buf->b_data, 474 arc_buf_size(os->os_phys_buf)); 475 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 476 os->os_phys_buf = buf; 477 } 478 479 os->os_phys = os->os_phys_buf->b_data; 480 os->os_flags = os->os_phys->os_flags; 481 } else { 482 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? 483 sizeof (objset_phys_t) : OBJSET_PHYS_SIZE_V1; 484 os->os_phys_buf = arc_alloc_buf(spa, &os->os_phys_buf, 485 ARC_BUFC_METADATA, size); 486 os->os_phys = os->os_phys_buf->b_data; 487 bzero(os->os_phys, size); 488 } 489 490 /* 491 * Note: the changed_cb will be called once before the register 492 * func returns, thus changing the checksum/compression from the 493 * default (fletcher2/off). Snapshots don't need to know about 494 * checksum/compression/copies. 495 */ 496 if (ds != NULL) { 497 boolean_t needlock = B_FALSE; 498 499 os->os_encrypted = (ds->ds_dir->dd_crypto_obj != 0); 500 501 /* 502 * Note: it's valid to open the objset if the dataset is 503 * long-held, in which case the pool_config lock will not 504 * be held. 505 */ 506 if (!dsl_pool_config_held(dmu_objset_pool(os))) { 507 needlock = B_TRUE; 508 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 509 } 510 511 err = dsl_prop_register(ds, 512 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE), 513 primary_cache_changed_cb, os); 514 if (err == 0) { 515 err = dsl_prop_register(ds, 516 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE), 517 secondary_cache_changed_cb, os); 518 } 519 if (!ds->ds_is_snapshot) { 520 if (err == 0) { 521 err = dsl_prop_register(ds, 522 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 523 checksum_changed_cb, os); 524 } 525 if (err == 0) { 526 err = dsl_prop_register(ds, 527 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 528 compression_changed_cb, os); 529 } 530 if (err == 0) { 531 err = dsl_prop_register(ds, 532 zfs_prop_to_name(ZFS_PROP_COPIES), 533 copies_changed_cb, os); 534 } 535 if (err == 0) { 536 err = dsl_prop_register(ds, 537 zfs_prop_to_name(ZFS_PROP_DEDUP), 538 dedup_changed_cb, os); 539 } 540 if (err == 0) { 541 err = dsl_prop_register(ds, 542 zfs_prop_to_name(ZFS_PROP_LOGBIAS), 543 logbias_changed_cb, os); 544 } 545 if (err == 0) { 546 err = dsl_prop_register(ds, 547 zfs_prop_to_name(ZFS_PROP_SYNC), 548 sync_changed_cb, os); 549 } 550 if (err == 0) { 551 err = dsl_prop_register(ds, 552 zfs_prop_to_name( 553 ZFS_PROP_REDUNDANT_METADATA), 554 redundant_metadata_changed_cb, os); 555 } 556 if (err == 0) { 557 err = dsl_prop_register(ds, 558 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 559 recordsize_changed_cb, os); 560 } 561 if (err == 0) { 562 err = dsl_prop_register(ds, 563 zfs_prop_to_name(ZFS_PROP_DNODESIZE), 564 dnodesize_changed_cb, os); 565 } 566 if (err == 0) { 567 err = dsl_prop_register(ds, 568 zfs_prop_to_name( 569 ZFS_PROP_SPECIAL_SMALL_BLOCKS), 570 smallblk_changed_cb, os); 571 } 572 } 573 if (needlock) 574 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 575 if (err != 0) { 576 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 577 kmem_free(os, sizeof (objset_t)); 578 return (err); 579 } 580 } else { 581 /* It's the meta-objset. */ 582 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 583 os->os_compress = ZIO_COMPRESS_ON; 584 os->os_encrypted = B_FALSE; 585 os->os_copies = spa_max_replication(spa); 586 os->os_dedup_checksum = ZIO_CHECKSUM_OFF; 587 os->os_dedup_verify = B_FALSE; 588 os->os_logbias = ZFS_LOGBIAS_LATENCY; 589 os->os_sync = ZFS_SYNC_STANDARD; 590 os->os_primary_cache = ZFS_CACHE_ALL; 591 os->os_secondary_cache = ZFS_CACHE_ALL; 592 os->os_dnodesize = DNODE_MIN_SIZE; 593 } 594 /* 595 * These properties will be filled in by the logic in zfs_get_zplprop() 596 * when they are queried for the first time. 597 */ 598 os->os_version = OBJSET_PROP_UNINITIALIZED; 599 os->os_normalization = OBJSET_PROP_UNINITIALIZED; 600 os->os_utf8only = OBJSET_PROP_UNINITIALIZED; 601 os->os_casesensitivity = OBJSET_PROP_UNINITIALIZED; 602 603 if (ds == NULL || !ds->ds_is_snapshot) 604 os->os_zil_header = os->os_phys->os_zil_header; 605 os->os_zil = zil_alloc(os, &os->os_zil_header); 606 607 for (i = 0; i < TXG_SIZE; i++) { 608 os->os_dirty_dnodes[i] = multilist_create(sizeof (dnode_t), 609 offsetof(dnode_t, dn_dirty_link[i]), 610 dnode_multilist_index_func); 611 } 612 list_create(&os->os_dnodes, sizeof (dnode_t), 613 offsetof(dnode_t, dn_link)); 614 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 615 offsetof(dmu_buf_impl_t, db_link)); 616 617 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); 618 mutex_init(&os->os_userused_lock, NULL, MUTEX_DEFAULT, NULL); 619 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 620 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 621 os->os_obj_next_percpu_len = boot_ncpus; 622 os->os_obj_next_percpu = kmem_zalloc(os->os_obj_next_percpu_len * 623 sizeof (os->os_obj_next_percpu[0]), KM_SLEEP); 624 625 dnode_special_open(os, &os->os_phys->os_meta_dnode, 626 DMU_META_DNODE_OBJECT, &os->os_meta_dnode); 627 if (OBJSET_BUF_HAS_USERUSED(os->os_phys_buf)) { 628 dnode_special_open(os, &os->os_phys->os_userused_dnode, 629 DMU_USERUSED_OBJECT, &os->os_userused_dnode); 630 dnode_special_open(os, &os->os_phys->os_groupused_dnode, 631 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode); 632 if (OBJSET_BUF_HAS_PROJECTUSED(os->os_phys_buf)) 633 dnode_special_open(os, 634 &os->os_phys->os_projectused_dnode, 635 DMU_PROJECTUSED_OBJECT, &os->os_projectused_dnode); 636 } 637 638 mutex_init(&os->os_upgrade_lock, NULL, MUTEX_DEFAULT, NULL); 639 640 *osp = os; 641 return (0); 642 } 643 644 int 645 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) 646 { 647 int err = 0; 648 649 /* 650 * We shouldn't be doing anything with dsl_dataset_t's unless the 651 * pool_config lock is held, or the dataset is long-held. 652 */ 653 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool) || 654 dsl_dataset_long_held(ds)); 655 656 mutex_enter(&ds->ds_opening_lock); 657 if (ds->ds_objset == NULL) { 658 objset_t *os; 659 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 660 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 661 ds, dsl_dataset_get_blkptr(ds), &os); 662 rrw_exit(&ds->ds_bp_rwlock, FTAG); 663 664 if (err == 0) { 665 mutex_enter(&ds->ds_lock); 666 ASSERT(ds->ds_objset == NULL); 667 ds->ds_objset = os; 668 mutex_exit(&ds->ds_lock); 669 } 670 } 671 *osp = ds->ds_objset; 672 mutex_exit(&ds->ds_opening_lock); 673 return (err); 674 } 675 676 /* 677 * Holds the pool while the objset is held. Therefore only one objset 678 * can be held at a time. 679 */ 680 int 681 dmu_objset_hold_flags(const char *name, boolean_t decrypt, void *tag, 682 objset_t **osp) 683 { 684 dsl_pool_t *dp; 685 dsl_dataset_t *ds; 686 int err; 687 ds_hold_flags_t flags; 688 689 flags = (decrypt) ? DS_HOLD_FLAG_DECRYPT : DS_HOLD_FLAG_NONE; 690 err = dsl_pool_hold(name, tag, &dp); 691 if (err != 0) 692 return (err); 693 err = dsl_dataset_hold_flags(dp, name, flags, tag, &ds); 694 if (err != 0) { 695 dsl_pool_rele(dp, tag); 696 return (err); 697 } 698 699 err = dmu_objset_from_ds(ds, osp); 700 if (err != 0) { 701 dsl_dataset_rele(ds, tag); 702 dsl_pool_rele(dp, tag); 703 } 704 705 return (err); 706 } 707 708 int 709 dmu_objset_hold(const char *name, void *tag, objset_t **osp) 710 { 711 return (dmu_objset_hold_flags(name, B_FALSE, tag, osp)); 712 } 713 714 /* ARGSUSED */ 715 static int 716 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type, 717 boolean_t readonly, boolean_t decrypt, void *tag, objset_t **osp) 718 { 719 int err; 720 721 err = dmu_objset_from_ds(ds, osp); 722 if (err != 0) { 723 return (err); 724 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) { 725 return (SET_ERROR(EINVAL)); 726 } else if (!readonly && dsl_dataset_is_snapshot(ds)) { 727 return (SET_ERROR(EROFS)); 728 } else if (!readonly && decrypt && 729 dsl_dir_incompatible_encryption_version(ds->ds_dir)) { 730 return (SET_ERROR(EROFS)); 731 } 732 733 /* if we are decrypting, we can now check MACs in os->os_phys_buf */ 734 if (decrypt && arc_is_unauthenticated((*osp)->os_phys_buf)) { 735 zbookmark_phys_t zb; 736 737 SET_BOOKMARK(&zb, ds->ds_object, ZB_ROOT_OBJECT, 738 ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 739 err = arc_untransform((*osp)->os_phys_buf, (*osp)->os_spa, 740 &zb, B_FALSE); 741 if (err != 0) 742 return (err); 743 744 ASSERT0(arc_is_unauthenticated((*osp)->os_phys_buf)); 745 } 746 747 return (0); 748 } 749 750 /* 751 * dsl_pool must not be held when this is called. 752 * Upon successful return, there will be a longhold on the dataset, 753 * and the dsl_pool will not be held. 754 */ 755 int 756 dmu_objset_own(const char *name, dmu_objset_type_t type, 757 boolean_t readonly, boolean_t decrypt, void *tag, objset_t **osp) 758 { 759 dsl_pool_t *dp; 760 dsl_dataset_t *ds; 761 int err; 762 ds_hold_flags_t flags; 763 764 flags = (decrypt) ? DS_HOLD_FLAG_DECRYPT : DS_HOLD_FLAG_NONE; 765 err = dsl_pool_hold(name, FTAG, &dp); 766 if (err != 0) 767 return (err); 768 err = dsl_dataset_own(dp, name, flags, tag, &ds); 769 if (err != 0) { 770 dsl_pool_rele(dp, FTAG); 771 return (err); 772 } 773 err = dmu_objset_own_impl(ds, type, readonly, decrypt, tag, osp); 774 if (err != 0) { 775 dsl_dataset_disown(ds, flags, tag); 776 dsl_pool_rele(dp, FTAG); 777 return (err); 778 } 779 780 /* 781 * User accounting requires the dataset to be decrypted and rw. 782 * We also don't begin user accounting during claiming to help 783 * speed up pool import times and to keep this txg reserved 784 * completely for recovery work. 785 */ 786 if ((dmu_objset_userobjspace_upgradable(*osp) || 787 dmu_objset_projectquota_upgradable(*osp)) && 788 !readonly && !dp->dp_spa->spa_claiming && 789 (ds->ds_dir->dd_crypto_obj == 0 || decrypt)) 790 dmu_objset_id_quota_upgrade(*osp); 791 792 dsl_pool_rele(dp, FTAG); 793 return (0); 794 } 795 796 int 797 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type, 798 boolean_t readonly, boolean_t decrypt, void *tag, objset_t **osp) 799 { 800 dsl_dataset_t *ds; 801 int err; 802 ds_hold_flags_t flags; 803 804 flags = (decrypt) ? DS_HOLD_FLAG_DECRYPT : DS_HOLD_FLAG_NONE; 805 err = dsl_dataset_own_obj(dp, obj, flags, tag, &ds); 806 if (err != 0) 807 return (err); 808 809 err = dmu_objset_own_impl(ds, type, readonly, decrypt, tag, osp); 810 if (err != 0) { 811 dsl_dataset_disown(ds, flags, tag); 812 return (err); 813 } 814 815 return (0); 816 } 817 818 void 819 dmu_objset_rele_flags(objset_t *os, boolean_t decrypt, void *tag) 820 { 821 ds_hold_flags_t flags; 822 dsl_pool_t *dp = dmu_objset_pool(os); 823 824 flags = (decrypt) ? DS_HOLD_FLAG_DECRYPT : DS_HOLD_FLAG_NONE; 825 dsl_dataset_rele_flags(os->os_dsl_dataset, flags, tag); 826 dsl_pool_rele(dp, tag); 827 } 828 829 void 830 dmu_objset_rele(objset_t *os, void *tag) 831 { 832 dmu_objset_rele_flags(os, B_FALSE, tag); 833 } 834 835 /* 836 * When we are called, os MUST refer to an objset associated with a dataset 837 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner 838 * == tag. We will then release and reacquire ownership of the dataset while 839 * holding the pool config_rwlock to avoid intervening namespace or ownership 840 * changes may occur. 841 * 842 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to 843 * release the hold on its dataset and acquire a new one on the dataset of the 844 * same name so that it can be partially torn down and reconstructed. 845 */ 846 void 847 dmu_objset_refresh_ownership(dsl_dataset_t *ds, dsl_dataset_t **newds, 848 boolean_t decrypt, void *tag) 849 { 850 dsl_pool_t *dp; 851 char name[ZFS_MAX_DATASET_NAME_LEN]; 852 ds_hold_flags_t flags; 853 854 flags = (decrypt) ? DS_HOLD_FLAG_DECRYPT : DS_HOLD_FLAG_NONE; 855 VERIFY3P(ds, !=, NULL); 856 VERIFY3P(ds->ds_owner, ==, tag); 857 VERIFY(dsl_dataset_long_held(ds)); 858 859 dsl_dataset_name(ds, name); 860 dp = ds->ds_dir->dd_pool; 861 dsl_pool_config_enter(dp, FTAG); 862 863 dsl_dataset_disown(ds, flags, tag); 864 VERIFY0(dsl_dataset_own(dp, name, flags, tag, newds)); 865 dsl_pool_config_exit(dp, FTAG); 866 } 867 868 void 869 dmu_objset_disown(objset_t *os, boolean_t decrypt, void *tag) 870 { 871 ds_hold_flags_t flags; 872 873 flags = (decrypt) ? DS_HOLD_FLAG_DECRYPT : DS_HOLD_FLAG_NONE; 874 /* 875 * Stop upgrading thread 876 */ 877 dmu_objset_upgrade_stop(os); 878 dsl_dataset_disown(os->os_dsl_dataset, flags, tag); 879 } 880 881 void 882 dmu_objset_evict_dbufs(objset_t *os) 883 { 884 dnode_t dn_marker; 885 dnode_t *dn; 886 887 mutex_enter(&os->os_lock); 888 dn = list_head(&os->os_dnodes); 889 while (dn != NULL) { 890 /* 891 * Skip dnodes without holds. We have to do this dance 892 * because dnode_add_ref() only works if there is already a 893 * hold. If the dnode has no holds, then it has no dbufs. 894 */ 895 if (dnode_add_ref(dn, FTAG)) { 896 list_insert_after(&os->os_dnodes, dn, &dn_marker); 897 mutex_exit(&os->os_lock); 898 899 dnode_evict_dbufs(dn); 900 dnode_rele(dn, FTAG); 901 902 mutex_enter(&os->os_lock); 903 dn = list_next(&os->os_dnodes, &dn_marker); 904 list_remove(&os->os_dnodes, &dn_marker); 905 } else { 906 dn = list_next(&os->os_dnodes, dn); 907 } 908 } 909 mutex_exit(&os->os_lock); 910 911 if (DMU_USERUSED_DNODE(os) != NULL) { 912 if (DMU_PROJECTUSED_DNODE(os) != NULL) 913 dnode_evict_dbufs(DMU_PROJECTUSED_DNODE(os)); 914 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os)); 915 dnode_evict_dbufs(DMU_USERUSED_DNODE(os)); 916 } 917 dnode_evict_dbufs(DMU_META_DNODE(os)); 918 } 919 920 /* 921 * Objset eviction processing is split into into two pieces. 922 * The first marks the objset as evicting, evicts any dbufs that 923 * have a refcount of zero, and then queues up the objset for the 924 * second phase of eviction. Once os->os_dnodes has been cleared by 925 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed. 926 * The second phase closes the special dnodes, dequeues the objset from 927 * the list of those undergoing eviction, and finally frees the objset. 928 * 929 * NOTE: Due to asynchronous eviction processing (invocation of 930 * dnode_buf_pageout()), it is possible for the meta dnode for the 931 * objset to have no holds even though os->os_dnodes is not empty. 932 */ 933 void 934 dmu_objset_evict(objset_t *os) 935 { 936 dsl_dataset_t *ds = os->os_dsl_dataset; 937 938 for (int t = 0; t < TXG_SIZE; t++) 939 ASSERT(!dmu_objset_is_dirty(os, t)); 940 941 if (ds) 942 dsl_prop_unregister_all(ds, os); 943 944 if (os->os_sa) 945 sa_tear_down(os); 946 947 dmu_objset_evict_dbufs(os); 948 949 mutex_enter(&os->os_lock); 950 spa_evicting_os_register(os->os_spa, os); 951 if (list_is_empty(&os->os_dnodes)) { 952 mutex_exit(&os->os_lock); 953 dmu_objset_evict_done(os); 954 } else { 955 mutex_exit(&os->os_lock); 956 } 957 958 959 } 960 961 void 962 dmu_objset_evict_done(objset_t *os) 963 { 964 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 965 966 dnode_special_close(&os->os_meta_dnode); 967 if (DMU_USERUSED_DNODE(os)) { 968 if (DMU_PROJECTUSED_DNODE(os)) 969 dnode_special_close(&os->os_projectused_dnode); 970 dnode_special_close(&os->os_userused_dnode); 971 dnode_special_close(&os->os_groupused_dnode); 972 } 973 zil_free(os->os_zil); 974 975 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 976 977 /* 978 * This is a barrier to prevent the objset from going away in 979 * dnode_move() until we can safely ensure that the objset is still in 980 * use. We consider the objset valid before the barrier and invalid 981 * after the barrier. 982 */ 983 rw_enter(&os_lock, RW_READER); 984 rw_exit(&os_lock); 985 986 kmem_free(os->os_obj_next_percpu, 987 os->os_obj_next_percpu_len * sizeof (os->os_obj_next_percpu[0])); 988 989 mutex_destroy(&os->os_lock); 990 mutex_destroy(&os->os_userused_lock); 991 mutex_destroy(&os->os_obj_lock); 992 mutex_destroy(&os->os_user_ptr_lock); 993 mutex_destroy(&os->os_upgrade_lock); 994 for (int i = 0; i < TXG_SIZE; i++) { 995 multilist_destroy(os->os_dirty_dnodes[i]); 996 } 997 spa_evicting_os_deregister(os->os_spa, os); 998 kmem_free(os, sizeof (objset_t)); 999 } 1000 1001 timestruc_t 1002 dmu_objset_snap_cmtime(objset_t *os) 1003 { 1004 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); 1005 } 1006 1007 /* ARGSUSED */ 1008 objset_t * 1009 dmu_objset_create_impl_dnstats(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 1010 dmu_objset_type_t type, int levels, int blksz, int ibs, dmu_tx_t *tx) 1011 { 1012 objset_t *os; 1013 dnode_t *mdn; 1014 1015 ASSERT(dmu_tx_is_syncing(tx)); 1016 1017 if (blksz == 0) 1018 blksz = 1 << DNODE_BLOCK_SHIFT; 1019 if (ibs == 0) 1020 ibs = DN_MAX_INDBLKSHIFT; 1021 1022 if (ds != NULL) 1023 VERIFY0(dmu_objset_from_ds(ds, &os)); 1024 else 1025 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os)); 1026 1027 mdn = DMU_META_DNODE(os); 1028 1029 dnode_allocate(mdn, DMU_OT_DNODE, DNODE_BLOCK_SIZE, DN_MAX_INDBLKSHIFT, 1030 DMU_OT_NONE, 0, DNODE_MIN_SLOTS, tx); 1031 1032 /* 1033 * We don't want to have to increase the meta-dnode's nlevels 1034 * later, because then we could do it in quescing context while 1035 * we are also accessing it in open context. 1036 * 1037 * This precaution is not necessary for the MOS (ds == NULL), 1038 * because the MOS is only updated in syncing context. 1039 * This is most fortunate: the MOS is the only objset that 1040 * needs to be synced multiple times as spa_sync() iterates 1041 * to convergence, so minimizing its dn_nlevels matters. 1042 */ 1043 if (ds != NULL) { 1044 if (levels == 0) { 1045 levels = 1; 1046 1047 /* 1048 * Determine the number of levels necessary for the 1049 * meta-dnode to contain DN_MAX_OBJECT dnodes. Note 1050 * that in order to ensure that we do not overflow 1051 * 64 bits, there has to be a nlevels that gives us a 1052 * number of blocks > DN_MAX_OBJECT but < 2^64. 1053 * Therefore, (mdn->dn_indblkshift - SPA_BLKPTRSHIFT) 1054 * (10) must be less than (64 - log2(DN_MAX_OBJECT)) 1055 * (16). 1056 */ 1057 while ((uint64_t)mdn->dn_nblkptr << 1058 (mdn->dn_datablkshift - DNODE_SHIFT + (levels - 1) * 1059 (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 1060 DN_MAX_OBJECT) 1061 levels++; 1062 } 1063 1064 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 1065 mdn->dn_nlevels = levels; 1066 } 1067 1068 ASSERT(type != DMU_OST_NONE); 1069 ASSERT(type != DMU_OST_ANY); 1070 ASSERT(type < DMU_OST_NUMTYPES); 1071 os->os_phys->os_type = type; 1072 1073 /* 1074 * Enable user accounting if it is enabled and this is not an 1075 * encrypted receive. 1076 */ 1077 if (dmu_objset_userused_enabled(os) && 1078 (!os->os_encrypted || !dmu_objset_is_receiving(os))) { 1079 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1080 if (dmu_objset_userobjused_enabled(os)) { 1081 ds->ds_feature_activation_needed[ 1082 SPA_FEATURE_USEROBJ_ACCOUNTING] = B_TRUE; 1083 os->os_phys->os_flags |= 1084 OBJSET_FLAG_USEROBJACCOUNTING_COMPLETE; 1085 } 1086 if (dmu_objset_projectquota_enabled(os)) { 1087 ds->ds_feature_activation_needed[ 1088 SPA_FEATURE_PROJECT_QUOTA] = B_TRUE; 1089 os->os_phys->os_flags |= 1090 OBJSET_FLAG_PROJECTQUOTA_COMPLETE; 1091 } 1092 os->os_flags = os->os_phys->os_flags; 1093 } 1094 1095 dsl_dataset_dirty(ds, tx); 1096 1097 return (os); 1098 } 1099 1100 /* called from dsl for meta-objset */ 1101 objset_t * 1102 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 1103 dmu_objset_type_t type, dmu_tx_t *tx) 1104 { 1105 return (dmu_objset_create_impl_dnstats(spa, ds, bp, type, 0, 0, 0, tx)); 1106 } 1107 1108 typedef struct dmu_objset_create_arg { 1109 const char *doca_name; 1110 cred_t *doca_cred; 1111 void (*doca_userfunc)(objset_t *os, void *arg, 1112 cred_t *cr, dmu_tx_t *tx); 1113 void *doca_userarg; 1114 dmu_objset_type_t doca_type; 1115 uint64_t doca_flags; 1116 dsl_crypto_params_t *doca_dcp; 1117 } dmu_objset_create_arg_t; 1118 1119 /*ARGSUSED*/ 1120 static int 1121 dmu_objset_create_check(void *arg, dmu_tx_t *tx) 1122 { 1123 dmu_objset_create_arg_t *doca = arg; 1124 dsl_pool_t *dp = dmu_tx_pool(tx); 1125 dsl_dir_t *pdd; 1126 const char *tail; 1127 int error; 1128 1129 if (strchr(doca->doca_name, '@') != NULL) 1130 return (SET_ERROR(EINVAL)); 1131 1132 if (strlen(doca->doca_name) >= ZFS_MAX_DATASET_NAME_LEN) 1133 return (SET_ERROR(ENAMETOOLONG)); 1134 1135 if (dataset_nestcheck(doca->doca_name) != 0) 1136 return (SET_ERROR(ENAMETOOLONG)); 1137 1138 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail); 1139 if (error != 0) 1140 return (error); 1141 if (tail == NULL) { 1142 dsl_dir_rele(pdd, FTAG); 1143 return (SET_ERROR(EEXIST)); 1144 } 1145 1146 error = dmu_objset_create_crypt_check(pdd, doca->doca_dcp, NULL); 1147 if (error != 0) { 1148 dsl_dir_rele(pdd, FTAG); 1149 return (error); 1150 } 1151 1152 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 1153 doca->doca_cred); 1154 1155 dsl_dir_rele(pdd, FTAG); 1156 1157 return (error); 1158 } 1159 1160 static void 1161 dmu_objset_create_sync(void *arg, dmu_tx_t *tx) 1162 { 1163 dmu_objset_create_arg_t *doca = arg; 1164 dsl_pool_t *dp = dmu_tx_pool(tx); 1165 spa_t *spa = dp->dp_spa; 1166 dsl_dir_t *pdd; 1167 const char *tail; 1168 dsl_dataset_t *ds; 1169 uint64_t obj; 1170 blkptr_t *bp; 1171 objset_t *os; 1172 zio_t *rzio; 1173 1174 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail)); 1175 1176 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags, 1177 doca->doca_cred, doca->doca_dcp, tx); 1178 1179 VERIFY0(dsl_dataset_hold_obj_flags(pdd->dd_pool, obj, 1180 DS_HOLD_FLAG_DECRYPT, FTAG, &ds)); 1181 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 1182 bp = dsl_dataset_get_blkptr(ds); 1183 os = dmu_objset_create_impl(spa, ds, bp, doca->doca_type, tx); 1184 rrw_exit(&ds->ds_bp_rwlock, FTAG); 1185 1186 if (doca->doca_userfunc != NULL) { 1187 doca->doca_userfunc(os, doca->doca_userarg, 1188 doca->doca_cred, tx); 1189 } 1190 1191 /* 1192 * The doca_userfunc() may write out some data that needs to be 1193 * encrypted if the dataset is encrypted (specifically the root 1194 * directory). This data must be written out before the encryption 1195 * key mapping is removed by dsl_dataset_rele_flags(). Force the 1196 * I/O to occur immediately by invoking the relevant sections of 1197 * dsl_pool_sync(). 1198 */ 1199 if (os->os_encrypted) { 1200 dsl_dataset_t *tmpds = NULL; 1201 boolean_t need_sync_done = B_FALSE; 1202 1203 mutex_enter(&ds->ds_lock); 1204 ds->ds_owner = FTAG; 1205 mutex_exit(&ds->ds_lock); 1206 1207 rzio = zio_root(spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1208 tmpds = txg_list_remove_this(&dp->dp_dirty_datasets, ds, 1209 tx->tx_txg); 1210 if (tmpds != NULL) { 1211 dsl_dataset_sync(ds, rzio, tx); 1212 need_sync_done = B_TRUE; 1213 } 1214 VERIFY0(zio_wait(rzio)); 1215 dmu_objset_do_userquota_updates(os, tx); 1216 taskq_wait(dp->dp_sync_taskq); 1217 if (txg_list_member(&dp->dp_dirty_datasets, ds, tx->tx_txg)) { 1218 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1219 key_mapping_rele(spa, ds->ds_key_mapping, ds); 1220 } 1221 1222 rzio = zio_root(spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED); 1223 tmpds = txg_list_remove_this(&dp->dp_dirty_datasets, ds, 1224 tx->tx_txg); 1225 if (tmpds != NULL) { 1226 dmu_buf_rele(ds->ds_dbuf, ds); 1227 dsl_dataset_sync(ds, rzio, tx); 1228 } 1229 VERIFY0(zio_wait(rzio)); 1230 1231 if (need_sync_done) { 1232 ASSERT3P(ds->ds_key_mapping, !=, NULL); 1233 key_mapping_rele(spa, ds->ds_key_mapping, ds); 1234 dsl_dataset_sync_done(ds, tx); 1235 } 1236 1237 mutex_enter(&ds->ds_lock); 1238 ds->ds_owner = NULL; 1239 mutex_exit(&ds->ds_lock); 1240 } 1241 1242 spa_history_log_internal_ds(ds, "create", tx, ""); 1243 dsl_dataset_rele_flags(ds, DS_HOLD_FLAG_DECRYPT, FTAG); 1244 dsl_dir_rele(pdd, FTAG); 1245 } 1246 1247 int 1248 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 1249 dsl_crypto_params_t *dcp, dmu_objset_create_sync_func_t func, void *arg) 1250 { 1251 dmu_objset_create_arg_t doca; 1252 dsl_crypto_params_t tmp_dcp = { 0 }; 1253 1254 doca.doca_name = name; 1255 doca.doca_cred = CRED(); 1256 doca.doca_flags = flags; 1257 doca.doca_userfunc = func; 1258 doca.doca_userarg = arg; 1259 doca.doca_type = type; 1260 1261 /* 1262 * Some callers (mostly for testing) do not provide a dcp on their 1263 * own but various code inside the sync task will require it to be 1264 * allocated. Rather than adding NULL checks throughout this code 1265 * or adding dummy dcp's to all of the callers we simply create a 1266 * dummy one here and use that. This zero dcp will have the same 1267 * effect as asking for inheritence of all encryption params. 1268 */ 1269 doca.doca_dcp = (dcp != NULL) ? dcp : &tmp_dcp; 1270 1271 return (dsl_sync_task(name, 1272 dmu_objset_create_check, dmu_objset_create_sync, &doca, 1273 6, ZFS_SPACE_CHECK_NORMAL)); 1274 } 1275 1276 typedef struct dmu_objset_clone_arg { 1277 const char *doca_clone; 1278 const char *doca_origin; 1279 cred_t *doca_cred; 1280 } dmu_objset_clone_arg_t; 1281 1282 /*ARGSUSED*/ 1283 static int 1284 dmu_objset_clone_check(void *arg, dmu_tx_t *tx) 1285 { 1286 dmu_objset_clone_arg_t *doca = arg; 1287 dsl_dir_t *pdd; 1288 const char *tail; 1289 int error; 1290 dsl_dataset_t *origin; 1291 dsl_pool_t *dp = dmu_tx_pool(tx); 1292 1293 if (strchr(doca->doca_clone, '@') != NULL) 1294 return (SET_ERROR(EINVAL)); 1295 1296 if (strlen(doca->doca_clone) >= ZFS_MAX_DATASET_NAME_LEN) 1297 return (SET_ERROR(ENAMETOOLONG)); 1298 1299 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail); 1300 if (error != 0) 1301 return (error); 1302 if (tail == NULL) { 1303 dsl_dir_rele(pdd, FTAG); 1304 return (SET_ERROR(EEXIST)); 1305 } 1306 1307 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 1308 doca->doca_cred); 1309 if (error != 0) { 1310 dsl_dir_rele(pdd, FTAG); 1311 return (SET_ERROR(EDQUOT)); 1312 } 1313 1314 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin); 1315 if (error != 0) { 1316 dsl_dir_rele(pdd, FTAG); 1317 return (error); 1318 } 1319 1320 /* You can only clone snapshots, not the head datasets. */ 1321 if (!origin->ds_is_snapshot) { 1322 dsl_dataset_rele(origin, FTAG); 1323 dsl_dir_rele(pdd, FTAG); 1324 return (SET_ERROR(EINVAL)); 1325 } 1326 1327 dsl_dataset_rele(origin, FTAG); 1328 dsl_dir_rele(pdd, FTAG); 1329 1330 return (0); 1331 } 1332 1333 static void 1334 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx) 1335 { 1336 dmu_objset_clone_arg_t *doca = arg; 1337 dsl_pool_t *dp = dmu_tx_pool(tx); 1338 dsl_dir_t *pdd; 1339 const char *tail; 1340 dsl_dataset_t *origin, *ds; 1341 uint64_t obj; 1342 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 1343 1344 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail)); 1345 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin)); 1346 1347 obj = dsl_dataset_create_sync(pdd, tail, origin, 0, 1348 doca->doca_cred, NULL, tx); 1349 1350 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 1351 dsl_dataset_name(origin, namebuf); 1352 spa_history_log_internal_ds(ds, "clone", tx, 1353 "origin=%s (%llu)", namebuf, origin->ds_object); 1354 dsl_dataset_rele(ds, FTAG); 1355 dsl_dataset_rele(origin, FTAG); 1356 dsl_dir_rele(pdd, FTAG); 1357 } 1358 1359 int 1360 dmu_objset_clone(const char *clone, const char *origin) 1361 { 1362 dmu_objset_clone_arg_t doca; 1363 1364 doca.doca_clone = clone; 1365 doca.doca_origin = origin; 1366 doca.doca_cred = CRED(); 1367 1368 return (dsl_sync_task(clone, 1369 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 1370 6, ZFS_SPACE_CHECK_NORMAL)); 1371 } 1372 1373 static int 1374 dmu_objset_remap_indirects_impl(objset_t *os, uint64_t last_removed_txg) 1375 { 1376 int error = 0; 1377 uint64_t object = 0; 1378 while ((error = dmu_object_next(os, &object, B_FALSE, 0)) == 0) { 1379 error = dmu_object_remap_indirects(os, object, 1380 last_removed_txg); 1381 /* 1382 * If the ZPL removed the object before we managed to dnode_hold 1383 * it, we would get an ENOENT. If the ZPL declares its intent 1384 * to remove the object (dnode_free) before we manage to 1385 * dnode_hold it, we would get an EEXIST. In either case, we 1386 * want to continue remapping the other objects in the objset; 1387 * in all other cases, we want to break early. 1388 */ 1389 if (error != 0 && error != ENOENT && error != EEXIST) { 1390 break; 1391 } 1392 } 1393 if (error == ESRCH) { 1394 error = 0; 1395 } 1396 return (error); 1397 } 1398 1399 int 1400 dmu_objset_remap_indirects(const char *fsname) 1401 { 1402 int error = 0; 1403 objset_t *os = NULL; 1404 uint64_t last_removed_txg; 1405 uint64_t remap_start_txg; 1406 dsl_dir_t *dd; 1407 1408 error = dmu_objset_hold(fsname, FTAG, &os); 1409 if (error != 0) { 1410 return (error); 1411 } 1412 dd = dmu_objset_ds(os)->ds_dir; 1413 1414 if (!spa_feature_is_enabled(dmu_objset_spa(os), 1415 SPA_FEATURE_OBSOLETE_COUNTS)) { 1416 dmu_objset_rele(os, FTAG); 1417 return (SET_ERROR(ENOTSUP)); 1418 } 1419 1420 if (dsl_dataset_is_snapshot(dmu_objset_ds(os))) { 1421 dmu_objset_rele(os, FTAG); 1422 return (SET_ERROR(EINVAL)); 1423 } 1424 1425 /* 1426 * If there has not been a removal, we're done. 1427 */ 1428 last_removed_txg = spa_get_last_removal_txg(dmu_objset_spa(os)); 1429 if (last_removed_txg == -1ULL) { 1430 dmu_objset_rele(os, FTAG); 1431 return (0); 1432 } 1433 1434 /* 1435 * If we have remapped since the last removal, we're done. 1436 */ 1437 if (dsl_dir_is_zapified(dd)) { 1438 uint64_t last_remap_txg; 1439 if (zap_lookup(spa_meta_objset(dmu_objset_spa(os)), 1440 dd->dd_object, DD_FIELD_LAST_REMAP_TXG, 1441 sizeof (last_remap_txg), 1, &last_remap_txg) == 0 && 1442 last_remap_txg > last_removed_txg) { 1443 dmu_objset_rele(os, FTAG); 1444 return (0); 1445 } 1446 } 1447 1448 dsl_dataset_long_hold(dmu_objset_ds(os), FTAG); 1449 dsl_pool_rele(dmu_objset_pool(os), FTAG); 1450 1451 remap_start_txg = spa_last_synced_txg(dmu_objset_spa(os)); 1452 error = dmu_objset_remap_indirects_impl(os, last_removed_txg); 1453 if (error == 0) { 1454 /* 1455 * We update the last_remap_txg to be the start txg so that 1456 * we can guarantee that every block older than last_remap_txg 1457 * that can be remapped has been remapped. 1458 */ 1459 error = dsl_dir_update_last_remap_txg(dd, remap_start_txg); 1460 } 1461 1462 dsl_dataset_long_rele(dmu_objset_ds(os), FTAG); 1463 dsl_dataset_rele(dmu_objset_ds(os), FTAG); 1464 1465 return (error); 1466 } 1467 1468 int 1469 dmu_objset_snapshot_one(const char *fsname, const char *snapname) 1470 { 1471 int err; 1472 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname); 1473 nvlist_t *snaps = fnvlist_alloc(); 1474 1475 fnvlist_add_boolean(snaps, longsnap); 1476 strfree(longsnap); 1477 err = dsl_dataset_snapshot(snaps, NULL, NULL); 1478 fnvlist_free(snaps); 1479 return (err); 1480 } 1481 1482 static void 1483 dmu_objset_upgrade_task_cb(void *data) 1484 { 1485 objset_t *os = data; 1486 1487 mutex_enter(&os->os_upgrade_lock); 1488 os->os_upgrade_status = EINTR; 1489 if (!os->os_upgrade_exit) { 1490 int status; 1491 1492 mutex_exit(&os->os_upgrade_lock); 1493 1494 status = os->os_upgrade_cb(os); 1495 1496 mutex_enter(&os->os_upgrade_lock); 1497 1498 os->os_upgrade_status = status; 1499 } 1500 os->os_upgrade_exit = B_TRUE; 1501 os->os_upgrade_id = 0; 1502 mutex_exit(&os->os_upgrade_lock); 1503 dsl_dataset_long_rele(dmu_objset_ds(os), upgrade_tag); 1504 } 1505 1506 static void 1507 dmu_objset_upgrade(objset_t *os, dmu_objset_upgrade_cb_t cb) 1508 { 1509 if (os->os_upgrade_id != 0) 1510 return; 1511 1512 ASSERT(dsl_pool_config_held(dmu_objset_pool(os))); 1513 dsl_dataset_long_hold(dmu_objset_ds(os), upgrade_tag); 1514 1515 mutex_enter(&os->os_upgrade_lock); 1516 if (os->os_upgrade_id == 0 && os->os_upgrade_status == 0) { 1517 os->os_upgrade_exit = B_FALSE; 1518 os->os_upgrade_cb = cb; 1519 os->os_upgrade_id = taskq_dispatch( 1520 os->os_spa->spa_upgrade_taskq, 1521 dmu_objset_upgrade_task_cb, os, TQ_SLEEP); 1522 if (os->os_upgrade_id == TASKQID_INVALID) { 1523 dsl_dataset_long_rele(dmu_objset_ds(os), upgrade_tag); 1524 os->os_upgrade_status = ENOMEM; 1525 } 1526 } else { 1527 dsl_dataset_long_rele(dmu_objset_ds(os), upgrade_tag); 1528 } 1529 mutex_exit(&os->os_upgrade_lock); 1530 } 1531 1532 static void 1533 dmu_objset_upgrade_stop(objset_t *os) 1534 { 1535 mutex_enter(&os->os_upgrade_lock); 1536 os->os_upgrade_exit = B_TRUE; 1537 if (os->os_upgrade_id != 0) { 1538 taskqid_t tid = os->os_upgrade_id; 1539 1540 mutex_exit(&os->os_upgrade_lock); 1541 1542 taskq_wait_id(os->os_spa->spa_upgrade_taskq, tid); 1543 txg_wait_synced(os->os_spa->spa_dsl_pool, 0); 1544 } else { 1545 mutex_exit(&os->os_upgrade_lock); 1546 } 1547 } 1548 1549 static void 1550 dmu_objset_sync_dnodes(multilist_sublist_t *list, dmu_tx_t *tx) 1551 { 1552 dnode_t *dn; 1553 1554 while ((dn = multilist_sublist_head(list)) != NULL) { 1555 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 1556 ASSERT(dn->dn_dbuf->db_data_pending); 1557 /* 1558 * Initialize dn_zio outside dnode_sync() because the 1559 * meta-dnode needs to set it outside dnode_sync(). 1560 */ 1561 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 1562 ASSERT(dn->dn_zio); 1563 1564 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 1565 multilist_sublist_remove(list, dn); 1566 1567 /* 1568 * If we are not doing useraccounting (os_synced_dnodes == NULL) 1569 * we are done with this dnode for this txg. Unset dn_dirty_txg 1570 * if later txgs aren't dirtying it so that future holders do 1571 * not get a stale value. Otherwise, we will do this in 1572 * userquota_updates_task() when processing has completely 1573 * finished for this txg. 1574 */ 1575 multilist_t *newlist = dn->dn_objset->os_synced_dnodes; 1576 if (newlist != NULL) { 1577 (void) dnode_add_ref(dn, newlist); 1578 multilist_insert(newlist, dn); 1579 } else { 1580 mutex_enter(&dn->dn_mtx); 1581 if (dn->dn_dirty_txg == tx->tx_txg) 1582 dn->dn_dirty_txg = 0; 1583 mutex_exit(&dn->dn_mtx); 1584 } 1585 1586 dnode_sync(dn, tx); 1587 } 1588 } 1589 1590 /* ARGSUSED */ 1591 static void 1592 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) 1593 { 1594 blkptr_t *bp = zio->io_bp; 1595 objset_t *os = arg; 1596 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 1597 uint64_t fill = 0; 1598 1599 ASSERT(!BP_IS_EMBEDDED(bp)); 1600 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET); 1601 1602 /* 1603 * Update rootbp fill count: it should be the number of objects 1604 * allocated in the object set (not counting the "special" 1605 * objects that are stored in the objset_phys_t -- the meta 1606 * dnode and user/group/project accounting objects). 1607 */ 1608 for (int i = 0; i < dnp->dn_nblkptr; i++) 1609 fill += BP_GET_FILL(&dnp->dn_blkptr[i]); 1610 1611 BP_SET_FILL(bp, fill); 1612 1613 if (os->os_dsl_dataset != NULL) 1614 rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_WRITER, FTAG); 1615 *os->os_rootbp = *bp; 1616 if (os->os_dsl_dataset != NULL) 1617 rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); 1618 } 1619 1620 /* ARGSUSED */ 1621 static void 1622 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) 1623 { 1624 blkptr_t *bp = zio->io_bp; 1625 blkptr_t *bp_orig = &zio->io_bp_orig; 1626 objset_t *os = arg; 1627 1628 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 1629 ASSERT(BP_EQUAL(bp, bp_orig)); 1630 } else { 1631 dsl_dataset_t *ds = os->os_dsl_dataset; 1632 dmu_tx_t *tx = os->os_synctx; 1633 1634 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 1635 dsl_dataset_block_born(ds, bp, tx); 1636 } 1637 kmem_free(bp, sizeof (*bp)); 1638 } 1639 1640 typedef struct sync_dnodes_arg { 1641 multilist_t *sda_list; 1642 int sda_sublist_idx; 1643 multilist_t *sda_newlist; 1644 dmu_tx_t *sda_tx; 1645 } sync_dnodes_arg_t; 1646 1647 static void 1648 sync_dnodes_task(void *arg) 1649 { 1650 sync_dnodes_arg_t *sda = arg; 1651 1652 multilist_sublist_t *ms = 1653 multilist_sublist_lock(sda->sda_list, sda->sda_sublist_idx); 1654 1655 dmu_objset_sync_dnodes(ms, sda->sda_tx); 1656 1657 multilist_sublist_unlock(ms); 1658 1659 kmem_free(sda, sizeof (*sda)); 1660 } 1661 1662 1663 /* called from dsl */ 1664 void 1665 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 1666 { 1667 int txgoff; 1668 zbookmark_phys_t zb; 1669 zio_prop_t zp; 1670 zio_t *zio; 1671 list_t *list; 1672 dbuf_dirty_record_t *dr; 1673 blkptr_t *blkptr_copy = kmem_alloc(sizeof (*os->os_rootbp), KM_SLEEP); 1674 *blkptr_copy = *os->os_rootbp; 1675 1676 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 1677 1678 ASSERT(dmu_tx_is_syncing(tx)); 1679 /* XXX the write_done callback should really give us the tx... */ 1680 os->os_synctx = tx; 1681 1682 if (os->os_dsl_dataset == NULL) { 1683 /* 1684 * This is the MOS. If we have upgraded, 1685 * spa_max_replication() could change, so reset 1686 * os_copies here. 1687 */ 1688 os->os_copies = spa_max_replication(os->os_spa); 1689 } 1690 1691 /* 1692 * Create the root block IO 1693 */ 1694 SET_BOOKMARK(&zb, os->os_dsl_dataset ? 1695 os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1696 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 1697 arc_release(os->os_phys_buf, &os->os_phys_buf); 1698 1699 dmu_write_policy(os, NULL, 0, 0, &zp); 1700 1701 /* 1702 * If we are either claiming the ZIL or doing a raw receive, write 1703 * out the os_phys_buf raw. Neither of these actions will effect the 1704 * MAC at this point. 1705 */ 1706 if (os->os_raw_receive || 1707 os->os_next_write_raw[tx->tx_txg & TXG_MASK]) { 1708 ASSERT(os->os_encrypted); 1709 arc_convert_to_raw(os->os_phys_buf, 1710 os->os_dsl_dataset->ds_object, ZFS_HOST_BYTEORDER, 1711 DMU_OT_OBJSET, NULL, NULL, NULL); 1712 } 1713 1714 zio = arc_write(pio, os->os_spa, tx->tx_txg, 1715 blkptr_copy, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), 1716 &zp, dmu_objset_write_ready, NULL, NULL, dmu_objset_write_done, 1717 os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 1718 1719 /* 1720 * Sync special dnodes - the parent IO for the sync is the root block 1721 */ 1722 DMU_META_DNODE(os)->dn_zio = zio; 1723 dnode_sync(DMU_META_DNODE(os), tx); 1724 1725 os->os_phys->os_flags = os->os_flags; 1726 1727 if (DMU_USERUSED_DNODE(os) && 1728 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { 1729 DMU_USERUSED_DNODE(os)->dn_zio = zio; 1730 dnode_sync(DMU_USERUSED_DNODE(os), tx); 1731 DMU_GROUPUSED_DNODE(os)->dn_zio = zio; 1732 dnode_sync(DMU_GROUPUSED_DNODE(os), tx); 1733 } 1734 1735 if (DMU_PROJECTUSED_DNODE(os) && 1736 DMU_PROJECTUSED_DNODE(os)->dn_type != DMU_OT_NONE) { 1737 DMU_PROJECTUSED_DNODE(os)->dn_zio = zio; 1738 dnode_sync(DMU_PROJECTUSED_DNODE(os), tx); 1739 } 1740 1741 txgoff = tx->tx_txg & TXG_MASK; 1742 1743 if (dmu_objset_userused_enabled(os) && 1744 (!os->os_encrypted || !dmu_objset_is_receiving(os))) { 1745 /* 1746 * We must create the list here because it uses the 1747 * dn_dirty_link[] of this txg. But it may already 1748 * exist because we call dsl_dataset_sync() twice per txg. 1749 */ 1750 if (os->os_synced_dnodes == NULL) { 1751 os->os_synced_dnodes = 1752 multilist_create(sizeof (dnode_t), 1753 offsetof(dnode_t, dn_dirty_link[txgoff]), 1754 dnode_multilist_index_func); 1755 } else { 1756 ASSERT3U(os->os_synced_dnodes->ml_offset, ==, 1757 offsetof(dnode_t, dn_dirty_link[txgoff])); 1758 } 1759 } 1760 1761 for (int i = 0; 1762 i < multilist_get_num_sublists(os->os_dirty_dnodes[txgoff]); i++) { 1763 sync_dnodes_arg_t *sda = kmem_alloc(sizeof (*sda), KM_SLEEP); 1764 sda->sda_list = os->os_dirty_dnodes[txgoff]; 1765 sda->sda_sublist_idx = i; 1766 sda->sda_tx = tx; 1767 (void) taskq_dispatch(dmu_objset_pool(os)->dp_sync_taskq, 1768 sync_dnodes_task, sda, 0); 1769 /* callback frees sda */ 1770 } 1771 taskq_wait(dmu_objset_pool(os)->dp_sync_taskq); 1772 1773 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; 1774 while ((dr = list_head(list)) != NULL) { 1775 ASSERT0(dr->dr_dbuf->db_level); 1776 list_remove(list, dr); 1777 if (dr->dr_zio) 1778 zio_nowait(dr->dr_zio); 1779 } 1780 1781 /* Enable dnode backfill if enough objects have been freed. */ 1782 if (os->os_freed_dnodes >= dmu_rescan_dnode_threshold) { 1783 os->os_rescan_dnodes = B_TRUE; 1784 os->os_freed_dnodes = 0; 1785 } 1786 1787 /* 1788 * Free intent log blocks up to this tx. 1789 */ 1790 zil_sync(os->os_zil, tx); 1791 os->os_phys->os_zil_header = os->os_zil_header; 1792 zio_nowait(zio); 1793 } 1794 1795 boolean_t 1796 dmu_objset_is_dirty(objset_t *os, uint64_t txg) 1797 { 1798 return (!multilist_is_empty(os->os_dirty_dnodes[txg & TXG_MASK])); 1799 } 1800 1801 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1802 1803 void 1804 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1805 { 1806 used_cbs[ost] = cb; 1807 } 1808 1809 boolean_t 1810 dmu_objset_userused_enabled(objset_t *os) 1811 { 1812 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1813 used_cbs[os->os_phys->os_type] != NULL && 1814 DMU_USERUSED_DNODE(os) != NULL); 1815 } 1816 1817 boolean_t 1818 dmu_objset_userobjused_enabled(objset_t *os) 1819 { 1820 return (dmu_objset_userused_enabled(os) && 1821 spa_feature_is_enabled(os->os_spa, SPA_FEATURE_USEROBJ_ACCOUNTING)); 1822 } 1823 1824 boolean_t 1825 dmu_objset_projectquota_enabled(objset_t *os) 1826 { 1827 return (used_cbs[os->os_phys->os_type] != NULL && 1828 DMU_PROJECTUSED_DNODE(os) != NULL && 1829 spa_feature_is_enabled(os->os_spa, SPA_FEATURE_PROJECT_QUOTA)); 1830 } 1831 1832 typedef struct userquota_node { 1833 /* must be in the first field, see userquota_update_cache() */ 1834 char uqn_id[20 + DMU_OBJACCT_PREFIX_LEN]; 1835 int64_t uqn_delta; 1836 avl_node_t uqn_node; 1837 } userquota_node_t; 1838 1839 typedef struct userquota_cache { 1840 avl_tree_t uqc_user_deltas; 1841 avl_tree_t uqc_group_deltas; 1842 avl_tree_t uqc_project_deltas; 1843 } userquota_cache_t; 1844 1845 static int 1846 userquota_compare(const void *l, const void *r) 1847 { 1848 const userquota_node_t *luqn = l; 1849 const userquota_node_t *ruqn = r; 1850 int rv; 1851 1852 /* 1853 * NB: can only access uqn_id because userquota_update_cache() doesn't 1854 * pass in an entire userquota_node_t. 1855 */ 1856 rv = strcmp(luqn->uqn_id, ruqn->uqn_id); 1857 1858 return (TREE_ISIGN(rv)); 1859 } 1860 1861 static void 1862 do_userquota_cacheflush(objset_t *os, userquota_cache_t *cache, dmu_tx_t *tx) 1863 { 1864 void *cookie; 1865 userquota_node_t *uqn; 1866 1867 ASSERT(dmu_tx_is_syncing(tx)); 1868 1869 cookie = NULL; 1870 while ((uqn = avl_destroy_nodes(&cache->uqc_user_deltas, 1871 &cookie)) != NULL) { 1872 /* 1873 * os_userused_lock protects against concurrent calls to 1874 * zap_increment_int(). It's needed because zap_increment_int() 1875 * is not thread-safe (i.e. not atomic). 1876 */ 1877 mutex_enter(&os->os_userused_lock); 1878 VERIFY0(zap_increment(os, DMU_USERUSED_OBJECT, 1879 uqn->uqn_id, uqn->uqn_delta, tx)); 1880 mutex_exit(&os->os_userused_lock); 1881 kmem_free(uqn, sizeof (*uqn)); 1882 } 1883 avl_destroy(&cache->uqc_user_deltas); 1884 1885 cookie = NULL; 1886 while ((uqn = avl_destroy_nodes(&cache->uqc_group_deltas, 1887 &cookie)) != NULL) { 1888 mutex_enter(&os->os_userused_lock); 1889 VERIFY0(zap_increment(os, DMU_GROUPUSED_OBJECT, 1890 uqn->uqn_id, uqn->uqn_delta, tx)); 1891 mutex_exit(&os->os_userused_lock); 1892 kmem_free(uqn, sizeof (*uqn)); 1893 } 1894 avl_destroy(&cache->uqc_group_deltas); 1895 1896 if (dmu_objset_projectquota_enabled(os)) { 1897 cookie = NULL; 1898 while ((uqn = avl_destroy_nodes(&cache->uqc_project_deltas, 1899 &cookie)) != NULL) { 1900 mutex_enter(&os->os_userused_lock); 1901 VERIFY0(zap_increment(os, DMU_PROJECTUSED_OBJECT, 1902 uqn->uqn_id, uqn->uqn_delta, tx)); 1903 mutex_exit(&os->os_userused_lock); 1904 kmem_free(uqn, sizeof (*uqn)); 1905 } 1906 avl_destroy(&cache->uqc_project_deltas); 1907 } 1908 } 1909 1910 static void 1911 userquota_update_cache(avl_tree_t *avl, const char *id, int64_t delta) 1912 { 1913 userquota_node_t *uqn; 1914 avl_index_t idx; 1915 1916 ASSERT(strlen(id) < sizeof (uqn->uqn_id)); 1917 /* 1918 * Use id directly for searching because uqn_id is the first field of 1919 * userquota_node_t and fields after uqn_id won't be accessed in 1920 * avl_find(). 1921 */ 1922 uqn = avl_find(avl, (const void *)id, &idx); 1923 if (uqn == NULL) { 1924 uqn = kmem_zalloc(sizeof (*uqn), KM_SLEEP); 1925 (void) strlcpy(uqn->uqn_id, id, sizeof (uqn->uqn_id)); 1926 avl_insert(avl, uqn, idx); 1927 } 1928 uqn->uqn_delta += delta; 1929 } 1930 1931 static void 1932 do_userquota_update(objset_t *os, userquota_cache_t *cache, uint64_t used, 1933 uint64_t flags, uint64_t user, uint64_t group, uint64_t project, 1934 boolean_t subtract) 1935 { 1936 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { 1937 int64_t delta = DNODE_MIN_SIZE + used; 1938 char name[20]; 1939 1940 if (subtract) 1941 delta = -delta; 1942 1943 (void) sprintf(name, "%llx", (longlong_t)user); 1944 userquota_update_cache(&cache->uqc_user_deltas, name, delta); 1945 1946 (void) sprintf(name, "%llx", (longlong_t)group); 1947 userquota_update_cache(&cache->uqc_group_deltas, name, delta); 1948 1949 if (dmu_objset_projectquota_enabled(os)) { 1950 (void) sprintf(name, "%llx", (longlong_t)project); 1951 userquota_update_cache(&cache->uqc_project_deltas, 1952 name, delta); 1953 } 1954 } 1955 } 1956 1957 static void 1958 do_userobjquota_update(objset_t *os, userquota_cache_t *cache, uint64_t flags, 1959 uint64_t user, uint64_t group, uint64_t project, boolean_t subtract) 1960 { 1961 if (flags & DNODE_FLAG_USEROBJUSED_ACCOUNTED) { 1962 char name[20 + DMU_OBJACCT_PREFIX_LEN]; 1963 int delta = subtract ? -1 : 1; 1964 1965 (void) snprintf(name, sizeof (name), DMU_OBJACCT_PREFIX "%llx", 1966 (longlong_t)user); 1967 userquota_update_cache(&cache->uqc_user_deltas, name, delta); 1968 1969 (void) snprintf(name, sizeof (name), DMU_OBJACCT_PREFIX "%llx", 1970 (longlong_t)group); 1971 userquota_update_cache(&cache->uqc_group_deltas, name, delta); 1972 1973 if (dmu_objset_projectquota_enabled(os)) { 1974 (void) snprintf(name, sizeof (name), 1975 DMU_OBJACCT_PREFIX "%llx", (longlong_t)project); 1976 userquota_update_cache(&cache->uqc_project_deltas, 1977 name, delta); 1978 } 1979 } 1980 } 1981 1982 typedef struct userquota_updates_arg { 1983 objset_t *uua_os; 1984 int uua_sublist_idx; 1985 dmu_tx_t *uua_tx; 1986 } userquota_updates_arg_t; 1987 1988 static void 1989 userquota_updates_task(void *arg) 1990 { 1991 userquota_updates_arg_t *uua = arg; 1992 objset_t *os = uua->uua_os; 1993 dmu_tx_t *tx = uua->uua_tx; 1994 dnode_t *dn; 1995 userquota_cache_t cache = { 0 }; 1996 1997 multilist_sublist_t *list = 1998 multilist_sublist_lock(os->os_synced_dnodes, uua->uua_sublist_idx); 1999 2000 ASSERT(multilist_sublist_head(list) == NULL || 2001 dmu_objset_userused_enabled(os)); 2002 avl_create(&cache.uqc_user_deltas, userquota_compare, 2003 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node)); 2004 avl_create(&cache.uqc_group_deltas, userquota_compare, 2005 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node)); 2006 if (dmu_objset_projectquota_enabled(os)) 2007 avl_create(&cache.uqc_project_deltas, userquota_compare, 2008 sizeof (userquota_node_t), offsetof(userquota_node_t, 2009 uqn_node)); 2010 2011 while ((dn = multilist_sublist_head(list)) != NULL) { 2012 int flags; 2013 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 2014 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 2015 dn->dn_phys->dn_flags & 2016 DNODE_FLAG_USERUSED_ACCOUNTED); 2017 2018 flags = dn->dn_id_flags; 2019 ASSERT(flags); 2020 if (flags & DN_ID_OLD_EXIST) { 2021 do_userquota_update(os, &cache, dn->dn_oldused, 2022 dn->dn_oldflags, dn->dn_olduid, dn->dn_oldgid, 2023 dn->dn_oldprojid, B_TRUE); 2024 do_userobjquota_update(os, &cache, dn->dn_oldflags, 2025 dn->dn_olduid, dn->dn_oldgid, 2026 dn->dn_oldprojid, B_TRUE); 2027 } 2028 if (flags & DN_ID_NEW_EXIST) { 2029 do_userquota_update(os, &cache, 2030 DN_USED_BYTES(dn->dn_phys), dn->dn_phys->dn_flags, 2031 dn->dn_newuid, dn->dn_newgid, 2032 dn->dn_newprojid, B_FALSE); 2033 do_userobjquota_update(os, &cache, 2034 dn->dn_phys->dn_flags, dn->dn_newuid, dn->dn_newgid, 2035 dn->dn_newprojid, B_FALSE); 2036 } 2037 2038 mutex_enter(&dn->dn_mtx); 2039 dn->dn_oldused = 0; 2040 dn->dn_oldflags = 0; 2041 if (dn->dn_id_flags & DN_ID_NEW_EXIST) { 2042 dn->dn_olduid = dn->dn_newuid; 2043 dn->dn_oldgid = dn->dn_newgid; 2044 dn->dn_oldprojid = dn->dn_newprojid; 2045 dn->dn_id_flags |= DN_ID_OLD_EXIST; 2046 if (dn->dn_bonuslen == 0) 2047 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 2048 else 2049 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 2050 } 2051 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); 2052 if (dn->dn_dirty_txg == spa_syncing_txg(os->os_spa)) 2053 dn->dn_dirty_txg = 0; 2054 mutex_exit(&dn->dn_mtx); 2055 2056 multilist_sublist_remove(list, dn); 2057 dnode_rele(dn, os->os_synced_dnodes); 2058 } 2059 do_userquota_cacheflush(os, &cache, tx); 2060 multilist_sublist_unlock(list); 2061 kmem_free(uua, sizeof (*uua)); 2062 } 2063 2064 void 2065 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) 2066 { 2067 if (!dmu_objset_userused_enabled(os)) 2068 return; 2069 2070 /* 2071 * If this is a raw receive just return and handle accounting 2072 * later when we have the keys loaded. We also don't do user 2073 * accounting during claiming since the datasets are not owned 2074 * for the duration of claiming and this txg should only be 2075 * used for recovery. 2076 */ 2077 if (os->os_encrypted && dmu_objset_is_receiving(os)) 2078 return; 2079 2080 if (tx->tx_txg <= os->os_spa->spa_claim_max_txg) 2081 return; 2082 2083 /* Allocate the user/group/project used objects if necessary. */ 2084 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { 2085 VERIFY0(zap_create_claim(os, 2086 DMU_USERUSED_OBJECT, 2087 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 2088 VERIFY0(zap_create_claim(os, 2089 DMU_GROUPUSED_OBJECT, 2090 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 2091 } 2092 2093 if (dmu_objset_projectquota_enabled(os) && 2094 DMU_PROJECTUSED_DNODE(os)->dn_type == DMU_OT_NONE) { 2095 VERIFY0(zap_create_claim(os, DMU_PROJECTUSED_OBJECT, 2096 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 2097 } 2098 2099 for (int i = 0; 2100 i < multilist_get_num_sublists(os->os_synced_dnodes); i++) { 2101 userquota_updates_arg_t *uua = 2102 kmem_alloc(sizeof (*uua), KM_SLEEP); 2103 uua->uua_os = os; 2104 uua->uua_sublist_idx = i; 2105 uua->uua_tx = tx; 2106 /* note: caller does taskq_wait() */ 2107 (void) taskq_dispatch(dmu_objset_pool(os)->dp_sync_taskq, 2108 userquota_updates_task, uua, 0); 2109 /* callback frees uua */ 2110 } 2111 } 2112 2113 /* 2114 * Returns a pointer to data to find uid/gid from 2115 * 2116 * If a dirty record for transaction group that is syncing can't 2117 * be found then NULL is returned. In the NULL case it is assumed 2118 * the uid/gid aren't changing. 2119 */ 2120 static void * 2121 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) 2122 { 2123 dbuf_dirty_record_t *dr, **drp; 2124 void *data; 2125 2126 if (db->db_dirtycnt == 0) 2127 return (db->db.db_data); /* Nothing is changing */ 2128 2129 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 2130 if (dr->dr_txg == tx->tx_txg) 2131 break; 2132 2133 if (dr == NULL) { 2134 data = NULL; 2135 } else { 2136 dnode_t *dn; 2137 2138 DB_DNODE_ENTER(dr->dr_dbuf); 2139 dn = DB_DNODE(dr->dr_dbuf); 2140 2141 if (dn->dn_bonuslen == 0 && 2142 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) 2143 data = dr->dt.dl.dr_data->b_data; 2144 else 2145 data = dr->dt.dl.dr_data; 2146 2147 DB_DNODE_EXIT(dr->dr_dbuf); 2148 } 2149 2150 return (data); 2151 } 2152 2153 void 2154 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) 2155 { 2156 objset_t *os = dn->dn_objset; 2157 void *data = NULL; 2158 dmu_buf_impl_t *db = NULL; 2159 uint64_t *user = NULL; 2160 uint64_t *group = NULL; 2161 uint64_t *project = NULL; 2162 int flags = dn->dn_id_flags; 2163 int error; 2164 boolean_t have_spill = B_FALSE; 2165 2166 if (!dmu_objset_userused_enabled(dn->dn_objset)) 2167 return; 2168 2169 /* 2170 * Raw receives introduce a problem with user accounting. Raw 2171 * receives cannot update the user accounting info because the 2172 * user ids and the sizes are encrypted. To guarantee that we 2173 * never end up with bad user accounting, we simply disable it 2174 * during raw receives. We also disable this for normal receives 2175 * so that an incremental raw receive may be done on top of an 2176 * existing non-raw receive. 2177 */ 2178 if (os->os_encrypted && dmu_objset_is_receiving(os)) 2179 return; 2180 2181 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| 2182 DN_ID_CHKED_SPILL))) 2183 return; 2184 2185 if (before && dn->dn_bonuslen != 0) 2186 data = DN_BONUS(dn->dn_phys); 2187 else if (!before && dn->dn_bonuslen != 0) { 2188 if (dn->dn_bonus) { 2189 db = dn->dn_bonus; 2190 mutex_enter(&db->db_mtx); 2191 data = dmu_objset_userquota_find_data(db, tx); 2192 } else { 2193 data = DN_BONUS(dn->dn_phys); 2194 } 2195 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { 2196 int rf = 0; 2197 2198 if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) 2199 rf |= DB_RF_HAVESTRUCT; 2200 error = dmu_spill_hold_by_dnode(dn, 2201 rf | DB_RF_MUST_SUCCEED, 2202 FTAG, (dmu_buf_t **)&db); 2203 ASSERT(error == 0); 2204 mutex_enter(&db->db_mtx); 2205 data = (before) ? db->db.db_data : 2206 dmu_objset_userquota_find_data(db, tx); 2207 have_spill = B_TRUE; 2208 } else { 2209 mutex_enter(&dn->dn_mtx); 2210 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 2211 mutex_exit(&dn->dn_mtx); 2212 return; 2213 } 2214 2215 if (before) { 2216 ASSERT(data); 2217 user = &dn->dn_olduid; 2218 group = &dn->dn_oldgid; 2219 project = &dn->dn_oldprojid; 2220 } else if (data) { 2221 user = &dn->dn_newuid; 2222 group = &dn->dn_newgid; 2223 project = &dn->dn_newprojid; 2224 } 2225 2226 /* 2227 * Must always call the callback in case the object 2228 * type has changed and that type isn't an object type to track 2229 */ 2230 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, 2231 user, group, project); 2232 2233 /* 2234 * Preserve existing uid/gid when the callback can't determine 2235 * what the new uid/gid are and the callback returned EEXIST. 2236 * The EEXIST error tells us to just use the existing uid/gid. 2237 * If we don't know what the old values are then just assign 2238 * them to 0, since that is a new file being created. 2239 */ 2240 if (!before && data == NULL && error == EEXIST) { 2241 if (flags & DN_ID_OLD_EXIST) { 2242 dn->dn_newuid = dn->dn_olduid; 2243 dn->dn_newgid = dn->dn_oldgid; 2244 dn->dn_newprojid = dn->dn_oldprojid; 2245 } else { 2246 dn->dn_newuid = 0; 2247 dn->dn_newgid = 0; 2248 dn->dn_newprojid = ZFS_DEFAULT_PROJID; 2249 } 2250 error = 0; 2251 } 2252 2253 if (db) 2254 mutex_exit(&db->db_mtx); 2255 2256 mutex_enter(&dn->dn_mtx); 2257 if (error == 0 && before) 2258 dn->dn_id_flags |= DN_ID_OLD_EXIST; 2259 if (error == 0 && !before) 2260 dn->dn_id_flags |= DN_ID_NEW_EXIST; 2261 2262 if (have_spill) { 2263 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 2264 } else { 2265 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 2266 } 2267 mutex_exit(&dn->dn_mtx); 2268 if (have_spill) 2269 dmu_buf_rele((dmu_buf_t *)db, FTAG); 2270 } 2271 2272 boolean_t 2273 dmu_objset_userspace_present(objset_t *os) 2274 { 2275 return (os->os_phys->os_flags & 2276 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 2277 } 2278 2279 boolean_t 2280 dmu_objset_userobjspace_present(objset_t *os) 2281 { 2282 return (os->os_phys->os_flags & 2283 OBJSET_FLAG_USEROBJACCOUNTING_COMPLETE); 2284 } 2285 2286 boolean_t 2287 dmu_objset_projectquota_present(objset_t *os) 2288 { 2289 return (os->os_phys->os_flags & 2290 OBJSET_FLAG_PROJECTQUOTA_COMPLETE); 2291 } 2292 2293 static int 2294 dmu_objset_space_upgrade(objset_t *os) 2295 { 2296 uint64_t obj; 2297 int err = 0; 2298 2299 /* 2300 * We simply need to mark every object dirty, so that it will be 2301 * synced out and now accounted. If this is called 2302 * concurrently, or if we already did some work before crashing, 2303 * that's fine, since we track each object's accounted state 2304 * independently. 2305 */ 2306 2307 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 2308 dmu_tx_t *tx; 2309 dmu_buf_t *db; 2310 int objerr; 2311 2312 mutex_enter(&os->os_upgrade_lock); 2313 if (os->os_upgrade_exit) 2314 err = SET_ERROR(EINTR); 2315 mutex_exit(&os->os_upgrade_lock); 2316 if (err != 0) 2317 return (err); 2318 2319 /* 2320 * The following is only valid on Linux since we cannot send 2321 * a signal to a kernel thread on illumos (because we have no 2322 * lwp and never return to user-land). 2323 * 2324 * if (issig(JUSTLOOKING) && issig(FORREAL)) 2325 * return (SET_ERROR(EINTR)); 2326 */ 2327 2328 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 2329 if (objerr != 0) 2330 continue; 2331 tx = dmu_tx_create(os); 2332 dmu_tx_hold_bonus(tx, obj); 2333 objerr = dmu_tx_assign(tx, TXG_WAIT); 2334 if (objerr != 0) { 2335 dmu_buf_rele(db, FTAG); 2336 dmu_tx_abort(tx); 2337 continue; 2338 } 2339 dmu_buf_will_dirty(db, tx); 2340 dmu_buf_rele(db, FTAG); 2341 dmu_tx_commit(tx); 2342 } 2343 return (0); 2344 } 2345 2346 int 2347 dmu_objset_userspace_upgrade(objset_t *os) 2348 { 2349 int err = 0; 2350 2351 if (dmu_objset_userspace_present(os)) 2352 return (0); 2353 if (dmu_objset_is_snapshot(os)) 2354 return (SET_ERROR(EINVAL)); 2355 if (!dmu_objset_userused_enabled(os)) 2356 return (SET_ERROR(ENOTSUP)); 2357 2358 err = dmu_objset_space_upgrade(os); 2359 if (err) 2360 return (err); 2361 2362 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 2363 txg_wait_synced(dmu_objset_pool(os), 0); 2364 return (0); 2365 } 2366 2367 static int 2368 dmu_objset_id_quota_upgrade_cb(objset_t *os) 2369 { 2370 int err = 0; 2371 2372 if (dmu_objset_userobjspace_present(os) && 2373 dmu_objset_projectquota_present(os)) 2374 return (0); 2375 if (dmu_objset_is_snapshot(os)) 2376 return (SET_ERROR(EINVAL)); 2377 if (!dmu_objset_userobjused_enabled(os)) 2378 return (SET_ERROR(ENOTSUP)); 2379 if (!dmu_objset_projectquota_enabled(os) && 2380 dmu_objset_userobjspace_present(os)) 2381 return (SET_ERROR(ENOTSUP)); 2382 2383 dmu_objset_ds(os)->ds_feature_activation_needed[ 2384 SPA_FEATURE_USEROBJ_ACCOUNTING] = B_TRUE; 2385 if (dmu_objset_projectquota_enabled(os)) 2386 dmu_objset_ds(os)->ds_feature_activation_needed[ 2387 SPA_FEATURE_PROJECT_QUOTA] = B_TRUE; 2388 2389 err = dmu_objset_space_upgrade(os); 2390 if (err) 2391 return (err); 2392 2393 os->os_flags |= OBJSET_FLAG_USEROBJACCOUNTING_COMPLETE; 2394 if (dmu_objset_projectquota_enabled(os)) 2395 os->os_flags |= OBJSET_FLAG_PROJECTQUOTA_COMPLETE; 2396 2397 txg_wait_synced(dmu_objset_pool(os), 0); 2398 return (0); 2399 } 2400 2401 void 2402 dmu_objset_id_quota_upgrade(objset_t *os) 2403 { 2404 dmu_objset_upgrade(os, dmu_objset_id_quota_upgrade_cb); 2405 } 2406 2407 boolean_t 2408 dmu_objset_userobjspace_upgradable(objset_t *os) 2409 { 2410 return (dmu_objset_type(os) == DMU_OST_ZFS && 2411 !dmu_objset_is_snapshot(os) && 2412 dmu_objset_userobjused_enabled(os) && 2413 !dmu_objset_userobjspace_present(os) && 2414 spa_writeable(dmu_objset_spa(os))); 2415 } 2416 2417 boolean_t 2418 dmu_objset_projectquota_upgradable(objset_t *os) 2419 { 2420 return (dmu_objset_type(os) == DMU_OST_ZFS && 2421 !dmu_objset_is_snapshot(os) && 2422 dmu_objset_projectquota_enabled(os) && 2423 !dmu_objset_projectquota_present(os) && 2424 spa_writeable(dmu_objset_spa(os))); 2425 } 2426 2427 void 2428 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 2429 uint64_t *usedobjsp, uint64_t *availobjsp) 2430 { 2431 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 2432 usedobjsp, availobjsp); 2433 } 2434 2435 uint64_t 2436 dmu_objset_fsid_guid(objset_t *os) 2437 { 2438 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 2439 } 2440 2441 void 2442 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 2443 { 2444 stat->dds_type = os->os_phys->os_type; 2445 if (os->os_dsl_dataset) 2446 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 2447 } 2448 2449 void 2450 dmu_objset_stats(objset_t *os, nvlist_t *nv) 2451 { 2452 ASSERT(os->os_dsl_dataset || 2453 os->os_phys->os_type == DMU_OST_META); 2454 2455 if (os->os_dsl_dataset != NULL) 2456 dsl_dataset_stats(os->os_dsl_dataset, nv); 2457 2458 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 2459 os->os_phys->os_type); 2460 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 2461 dmu_objset_userspace_present(os)); 2462 } 2463 2464 int 2465 dmu_objset_is_snapshot(objset_t *os) 2466 { 2467 if (os->os_dsl_dataset != NULL) 2468 return (os->os_dsl_dataset->ds_is_snapshot); 2469 else 2470 return (B_FALSE); 2471 } 2472 2473 int 2474 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 2475 boolean_t *conflict) 2476 { 2477 dsl_dataset_t *ds = os->os_dsl_dataset; 2478 uint64_t ignored; 2479 2480 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 2481 return (SET_ERROR(ENOENT)); 2482 2483 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 2484 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored, 2485 MT_NORMALIZE, real, maxlen, conflict)); 2486 } 2487 2488 int 2489 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 2490 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 2491 { 2492 dsl_dataset_t *ds = os->os_dsl_dataset; 2493 zap_cursor_t cursor; 2494 zap_attribute_t attr; 2495 2496 ASSERT(dsl_pool_config_held(dmu_objset_pool(os))); 2497 2498 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 2499 return (SET_ERROR(ENOENT)); 2500 2501 zap_cursor_init_serialized(&cursor, 2502 ds->ds_dir->dd_pool->dp_meta_objset, 2503 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp); 2504 2505 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 2506 zap_cursor_fini(&cursor); 2507 return (SET_ERROR(ENOENT)); 2508 } 2509 2510 if (strlen(attr.za_name) + 1 > namelen) { 2511 zap_cursor_fini(&cursor); 2512 return (SET_ERROR(ENAMETOOLONG)); 2513 } 2514 2515 (void) strcpy(name, attr.za_name); 2516 if (idp) 2517 *idp = attr.za_first_integer; 2518 if (case_conflict) 2519 *case_conflict = attr.za_normalization_conflict; 2520 zap_cursor_advance(&cursor); 2521 *offp = zap_cursor_serialize(&cursor); 2522 zap_cursor_fini(&cursor); 2523 2524 return (0); 2525 } 2526 2527 int 2528 dmu_dir_list_next(objset_t *os, int namelen, char *name, 2529 uint64_t *idp, uint64_t *offp) 2530 { 2531 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 2532 zap_cursor_t cursor; 2533 zap_attribute_t attr; 2534 2535 /* there is no next dir on a snapshot! */ 2536 if (os->os_dsl_dataset->ds_object != 2537 dsl_dir_phys(dd)->dd_head_dataset_obj) 2538 return (SET_ERROR(ENOENT)); 2539 2540 zap_cursor_init_serialized(&cursor, 2541 dd->dd_pool->dp_meta_objset, 2542 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp); 2543 2544 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 2545 zap_cursor_fini(&cursor); 2546 return (SET_ERROR(ENOENT)); 2547 } 2548 2549 if (strlen(attr.za_name) + 1 > namelen) { 2550 zap_cursor_fini(&cursor); 2551 return (SET_ERROR(ENAMETOOLONG)); 2552 } 2553 2554 (void) strcpy(name, attr.za_name); 2555 if (idp) 2556 *idp = attr.za_first_integer; 2557 zap_cursor_advance(&cursor); 2558 *offp = zap_cursor_serialize(&cursor); 2559 zap_cursor_fini(&cursor); 2560 2561 return (0); 2562 } 2563 2564 typedef struct dmu_objset_find_ctx { 2565 taskq_t *dc_tq; 2566 dsl_pool_t *dc_dp; 2567 uint64_t dc_ddobj; 2568 char *dc_ddname; /* last component of ddobj's name */ 2569 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *); 2570 void *dc_arg; 2571 int dc_flags; 2572 kmutex_t *dc_error_lock; 2573 int *dc_error; 2574 } dmu_objset_find_ctx_t; 2575 2576 static void 2577 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp) 2578 { 2579 dsl_pool_t *dp = dcp->dc_dp; 2580 dsl_dir_t *dd; 2581 dsl_dataset_t *ds; 2582 zap_cursor_t zc; 2583 zap_attribute_t *attr; 2584 uint64_t thisobj; 2585 int err = 0; 2586 2587 /* don't process if there already was an error */ 2588 if (*dcp->dc_error != 0) 2589 goto out; 2590 2591 /* 2592 * Note: passing the name (dc_ddname) here is optional, but it 2593 * improves performance because we don't need to call 2594 * zap_value_search() to determine the name. 2595 */ 2596 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, dcp->dc_ddname, FTAG, &dd); 2597 if (err != 0) 2598 goto out; 2599 2600 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 2601 if (dd->dd_myname[0] == '$') { 2602 dsl_dir_rele(dd, FTAG); 2603 goto out; 2604 } 2605 2606 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 2607 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 2608 2609 /* 2610 * Iterate over all children. 2611 */ 2612 if (dcp->dc_flags & DS_FIND_CHILDREN) { 2613 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2614 dsl_dir_phys(dd)->dd_child_dir_zapobj); 2615 zap_cursor_retrieve(&zc, attr) == 0; 2616 (void) zap_cursor_advance(&zc)) { 2617 ASSERT3U(attr->za_integer_length, ==, 2618 sizeof (uint64_t)); 2619 ASSERT3U(attr->za_num_integers, ==, 1); 2620 2621 dmu_objset_find_ctx_t *child_dcp = 2622 kmem_alloc(sizeof (*child_dcp), KM_SLEEP); 2623 *child_dcp = *dcp; 2624 child_dcp->dc_ddobj = attr->za_first_integer; 2625 child_dcp->dc_ddname = spa_strdup(attr->za_name); 2626 if (dcp->dc_tq != NULL) 2627 (void) taskq_dispatch(dcp->dc_tq, 2628 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP); 2629 else 2630 dmu_objset_find_dp_impl(child_dcp); 2631 } 2632 zap_cursor_fini(&zc); 2633 } 2634 2635 /* 2636 * Iterate over all snapshots. 2637 */ 2638 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) { 2639 dsl_dataset_t *ds; 2640 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 2641 2642 if (err == 0) { 2643 uint64_t snapobj; 2644 2645 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 2646 dsl_dataset_rele(ds, FTAG); 2647 2648 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 2649 zap_cursor_retrieve(&zc, attr) == 0; 2650 (void) zap_cursor_advance(&zc)) { 2651 ASSERT3U(attr->za_integer_length, ==, 2652 sizeof (uint64_t)); 2653 ASSERT3U(attr->za_num_integers, ==, 1); 2654 2655 err = dsl_dataset_hold_obj(dp, 2656 attr->za_first_integer, FTAG, &ds); 2657 if (err != 0) 2658 break; 2659 err = dcp->dc_func(dp, ds, dcp->dc_arg); 2660 dsl_dataset_rele(ds, FTAG); 2661 if (err != 0) 2662 break; 2663 } 2664 zap_cursor_fini(&zc); 2665 } 2666 } 2667 2668 kmem_free(attr, sizeof (zap_attribute_t)); 2669 2670 if (err != 0) { 2671 dsl_dir_rele(dd, FTAG); 2672 goto out; 2673 } 2674 2675 /* 2676 * Apply to self. 2677 */ 2678 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 2679 2680 /* 2681 * Note: we hold the dir while calling dsl_dataset_hold_obj() so 2682 * that the dir will remain cached, and we won't have to re-instantiate 2683 * it (which could be expensive due to finding its name via 2684 * zap_value_search()). 2685 */ 2686 dsl_dir_rele(dd, FTAG); 2687 if (err != 0) 2688 goto out; 2689 err = dcp->dc_func(dp, ds, dcp->dc_arg); 2690 dsl_dataset_rele(ds, FTAG); 2691 2692 out: 2693 if (err != 0) { 2694 mutex_enter(dcp->dc_error_lock); 2695 /* only keep first error */ 2696 if (*dcp->dc_error == 0) 2697 *dcp->dc_error = err; 2698 mutex_exit(dcp->dc_error_lock); 2699 } 2700 2701 if (dcp->dc_ddname != NULL) 2702 spa_strfree(dcp->dc_ddname); 2703 kmem_free(dcp, sizeof (*dcp)); 2704 } 2705 2706 static void 2707 dmu_objset_find_dp_cb(void *arg) 2708 { 2709 dmu_objset_find_ctx_t *dcp = arg; 2710 dsl_pool_t *dp = dcp->dc_dp; 2711 2712 /* 2713 * We need to get a pool_config_lock here, as there are several 2714 * asssert(pool_config_held) down the stack. Getting a lock via 2715 * dsl_pool_config_enter is risky, as it might be stalled by a 2716 * pending writer. This would deadlock, as the write lock can 2717 * only be granted when our parent thread gives up the lock. 2718 * The _prio interface gives us priority over a pending writer. 2719 */ 2720 dsl_pool_config_enter_prio(dp, FTAG); 2721 2722 dmu_objset_find_dp_impl(dcp); 2723 2724 dsl_pool_config_exit(dp, FTAG); 2725 } 2726 2727 /* 2728 * Find objsets under and including ddobj, call func(ds) on each. 2729 * The order for the enumeration is completely undefined. 2730 * func is called with dsl_pool_config held. 2731 */ 2732 int 2733 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj, 2734 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags) 2735 { 2736 int error = 0; 2737 taskq_t *tq = NULL; 2738 int ntasks; 2739 dmu_objset_find_ctx_t *dcp; 2740 kmutex_t err_lock; 2741 2742 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL); 2743 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP); 2744 dcp->dc_tq = NULL; 2745 dcp->dc_dp = dp; 2746 dcp->dc_ddobj = ddobj; 2747 dcp->dc_ddname = NULL; 2748 dcp->dc_func = func; 2749 dcp->dc_arg = arg; 2750 dcp->dc_flags = flags; 2751 dcp->dc_error_lock = &err_lock; 2752 dcp->dc_error = &error; 2753 2754 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) { 2755 /* 2756 * In case a write lock is held we can't make use of 2757 * parallelism, as down the stack of the worker threads 2758 * the lock is asserted via dsl_pool_config_held. 2759 * In case of a read lock this is solved by getting a read 2760 * lock in each worker thread, which isn't possible in case 2761 * of a writer lock. So we fall back to the synchronous path 2762 * here. 2763 * In the future it might be possible to get some magic into 2764 * dsl_pool_config_held in a way that it returns true for 2765 * the worker threads so that a single lock held from this 2766 * thread suffices. For now, stay single threaded. 2767 */ 2768 dmu_objset_find_dp_impl(dcp); 2769 mutex_destroy(&err_lock); 2770 2771 return (error); 2772 } 2773 2774 ntasks = dmu_find_threads; 2775 if (ntasks == 0) 2776 ntasks = vdev_count_leaves(dp->dp_spa) * 4; 2777 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks, 2778 INT_MAX, 0); 2779 if (tq == NULL) { 2780 kmem_free(dcp, sizeof (*dcp)); 2781 mutex_destroy(&err_lock); 2782 2783 return (SET_ERROR(ENOMEM)); 2784 } 2785 dcp->dc_tq = tq; 2786 2787 /* dcp will be freed by task */ 2788 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP); 2789 2790 /* 2791 * PORTING: this code relies on the property of taskq_wait to wait 2792 * until no more tasks are queued and no more tasks are active. As 2793 * we always queue new tasks from within other tasks, task_wait 2794 * reliably waits for the full recursion to finish, even though we 2795 * enqueue new tasks after taskq_wait has been called. 2796 * On platforms other than illumos, taskq_wait may not have this 2797 * property. 2798 */ 2799 taskq_wait(tq); 2800 taskq_destroy(tq); 2801 mutex_destroy(&err_lock); 2802 2803 return (error); 2804 } 2805 2806 /* 2807 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 2808 * The dp_config_rwlock must not be held when this is called, and it 2809 * will not be held when the callback is called. 2810 * Therefore this function should only be used when the pool is not changing 2811 * (e.g. in syncing context), or the callback can deal with the possible races. 2812 */ 2813 static int 2814 dmu_objset_find_impl(spa_t *spa, const char *name, 2815 int func(const char *, void *), void *arg, int flags) 2816 { 2817 dsl_dir_t *dd; 2818 dsl_pool_t *dp = spa_get_dsl(spa); 2819 dsl_dataset_t *ds; 2820 zap_cursor_t zc; 2821 zap_attribute_t *attr; 2822 char *child; 2823 uint64_t thisobj; 2824 int err; 2825 2826 dsl_pool_config_enter(dp, FTAG); 2827 2828 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL); 2829 if (err != 0) { 2830 dsl_pool_config_exit(dp, FTAG); 2831 return (err); 2832 } 2833 2834 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 2835 if (dd->dd_myname[0] == '$') { 2836 dsl_dir_rele(dd, FTAG); 2837 dsl_pool_config_exit(dp, FTAG); 2838 return (0); 2839 } 2840 2841 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 2842 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 2843 2844 /* 2845 * Iterate over all children. 2846 */ 2847 if (flags & DS_FIND_CHILDREN) { 2848 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2849 dsl_dir_phys(dd)->dd_child_dir_zapobj); 2850 zap_cursor_retrieve(&zc, attr) == 0; 2851 (void) zap_cursor_advance(&zc)) { 2852 ASSERT3U(attr->za_integer_length, ==, 2853 sizeof (uint64_t)); 2854 ASSERT3U(attr->za_num_integers, ==, 1); 2855 2856 child = kmem_asprintf("%s/%s", name, attr->za_name); 2857 dsl_pool_config_exit(dp, FTAG); 2858 err = dmu_objset_find_impl(spa, child, 2859 func, arg, flags); 2860 dsl_pool_config_enter(dp, FTAG); 2861 strfree(child); 2862 if (err != 0) 2863 break; 2864 } 2865 zap_cursor_fini(&zc); 2866 2867 if (err != 0) { 2868 dsl_dir_rele(dd, FTAG); 2869 dsl_pool_config_exit(dp, FTAG); 2870 kmem_free(attr, sizeof (zap_attribute_t)); 2871 return (err); 2872 } 2873 } 2874 2875 /* 2876 * Iterate over all snapshots. 2877 */ 2878 if (flags & DS_FIND_SNAPSHOTS) { 2879 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 2880 2881 if (err == 0) { 2882 uint64_t snapobj; 2883 2884 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 2885 dsl_dataset_rele(ds, FTAG); 2886 2887 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 2888 zap_cursor_retrieve(&zc, attr) == 0; 2889 (void) zap_cursor_advance(&zc)) { 2890 ASSERT3U(attr->za_integer_length, ==, 2891 sizeof (uint64_t)); 2892 ASSERT3U(attr->za_num_integers, ==, 1); 2893 2894 child = kmem_asprintf("%s@%s", 2895 name, attr->za_name); 2896 dsl_pool_config_exit(dp, FTAG); 2897 err = func(child, arg); 2898 dsl_pool_config_enter(dp, FTAG); 2899 strfree(child); 2900 if (err != 0) 2901 break; 2902 } 2903 zap_cursor_fini(&zc); 2904 } 2905 } 2906 2907 dsl_dir_rele(dd, FTAG); 2908 kmem_free(attr, sizeof (zap_attribute_t)); 2909 dsl_pool_config_exit(dp, FTAG); 2910 2911 if (err != 0) 2912 return (err); 2913 2914 /* Apply to self. */ 2915 return (func(name, arg)); 2916 } 2917 2918 /* 2919 * See comment above dmu_objset_find_impl(). 2920 */ 2921 int 2922 dmu_objset_find(char *name, int func(const char *, void *), void *arg, 2923 int flags) 2924 { 2925 spa_t *spa; 2926 int error; 2927 2928 error = spa_open(name, &spa, FTAG); 2929 if (error != 0) 2930 return (error); 2931 error = dmu_objset_find_impl(spa, name, func, arg, flags); 2932 spa_close(spa, FTAG); 2933 return (error); 2934 } 2935 2936 boolean_t 2937 dmu_objset_incompatible_encryption_version(objset_t *os) 2938 { 2939 return (dsl_dir_incompatible_encryption_version( 2940 os->os_dsl_dataset->ds_dir)); 2941 } 2942 2943 void 2944 dmu_objset_set_user(objset_t *os, void *user_ptr) 2945 { 2946 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 2947 os->os_user_ptr = user_ptr; 2948 } 2949 2950 void * 2951 dmu_objset_get_user(objset_t *os) 2952 { 2953 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 2954 return (os->os_user_ptr); 2955 } 2956 2957 /* 2958 * Determine name of filesystem, given name of snapshot. 2959 * buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes 2960 */ 2961 int 2962 dmu_fsname(const char *snapname, char *buf) 2963 { 2964 char *atp = strchr(snapname, '@'); 2965 if (atp == NULL) 2966 return (SET_ERROR(EINVAL)); 2967 if (atp - snapname >= ZFS_MAX_DATASET_NAME_LEN) 2968 return (SET_ERROR(ENAMETOOLONG)); 2969 (void) strlcpy(buf, snapname, atp - snapname + 1); 2970 return (0); 2971 } 2972 2973 /* 2974 * Call when we think we're going to write/free space in open context to track 2975 * the amount of dirty data in the open txg, which is also the amount 2976 * of memory that can not be evicted until this txg syncs. 2977 */ 2978 void 2979 dmu_objset_willuse_space(objset_t *os, int64_t space, dmu_tx_t *tx) 2980 { 2981 dsl_dataset_t *ds = os->os_dsl_dataset; 2982 int64_t aspace = spa_get_worst_case_asize(os->os_spa, space); 2983 2984 if (ds != NULL) { 2985 dsl_dir_willuse_space(ds->ds_dir, aspace, tx); 2986 dsl_pool_dirty_space(dmu_tx_pool(tx), space, tx); 2987 } 2988 } 2989