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 (c) 2013, Joyent, Inc. All rights reserved. 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 */ 32 33 /* Portions Copyright 2010 Robert Milkowski */ 34 35 #include <sys/cred.h> 36 #include <sys/zfs_context.h> 37 #include <sys/dmu_objset.h> 38 #include <sys/dsl_dir.h> 39 #include <sys/dsl_dataset.h> 40 #include <sys/dsl_prop.h> 41 #include <sys/dsl_pool.h> 42 #include <sys/dsl_synctask.h> 43 #include <sys/dsl_deleg.h> 44 #include <sys/dnode.h> 45 #include <sys/dbuf.h> 46 #include <sys/zvol.h> 47 #include <sys/dmu_tx.h> 48 #include <sys/zap.h> 49 #include <sys/zil.h> 50 #include <sys/dmu_impl.h> 51 #include <sys/zfs_ioctl.h> 52 #include <sys/sa.h> 53 #include <sys/zfs_onexit.h> 54 #include <sys/dsl_destroy.h> 55 #include <sys/vdev.h> 56 #include <sys/zfeature.h> 57 58 /* 59 * Needed to close a window in dnode_move() that allows the objset to be freed 60 * before it can be safely accessed. 61 */ 62 krwlock_t os_lock; 63 64 /* 65 * Tunable to overwrite the maximum number of threads for the parallization 66 * of dmu_objset_find_dp, needed to speed up the import of pools with many 67 * datasets. 68 * Default is 4 times the number of leaf vdevs. 69 */ 70 int dmu_find_threads = 0; 71 72 /* 73 * Backfill lower metadnode objects after this many have been freed. 74 * Backfilling negatively impacts object creation rates, so only do it 75 * if there are enough holes to fill. 76 */ 77 int dmu_rescan_dnode_threshold = 131072; 78 79 static void dmu_objset_find_dp_cb(void *arg); 80 81 void 82 dmu_objset_init(void) 83 { 84 rw_init(&os_lock, NULL, RW_DEFAULT, NULL); 85 } 86 87 void 88 dmu_objset_fini(void) 89 { 90 rw_destroy(&os_lock); 91 } 92 93 spa_t * 94 dmu_objset_spa(objset_t *os) 95 { 96 return (os->os_spa); 97 } 98 99 zilog_t * 100 dmu_objset_zil(objset_t *os) 101 { 102 return (os->os_zil); 103 } 104 105 dsl_pool_t * 106 dmu_objset_pool(objset_t *os) 107 { 108 dsl_dataset_t *ds; 109 110 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir) 111 return (ds->ds_dir->dd_pool); 112 else 113 return (spa_get_dsl(os->os_spa)); 114 } 115 116 dsl_dataset_t * 117 dmu_objset_ds(objset_t *os) 118 { 119 return (os->os_dsl_dataset); 120 } 121 122 dmu_objset_type_t 123 dmu_objset_type(objset_t *os) 124 { 125 return (os->os_phys->os_type); 126 } 127 128 void 129 dmu_objset_name(objset_t *os, char *buf) 130 { 131 dsl_dataset_name(os->os_dsl_dataset, buf); 132 } 133 134 uint64_t 135 dmu_objset_id(objset_t *os) 136 { 137 dsl_dataset_t *ds = os->os_dsl_dataset; 138 139 return (ds ? ds->ds_object : 0); 140 } 141 142 zfs_sync_type_t 143 dmu_objset_syncprop(objset_t *os) 144 { 145 return (os->os_sync); 146 } 147 148 zfs_logbias_op_t 149 dmu_objset_logbias(objset_t *os) 150 { 151 return (os->os_logbias); 152 } 153 154 static void 155 checksum_changed_cb(void *arg, uint64_t newval) 156 { 157 objset_t *os = arg; 158 159 /* 160 * Inheritance should have been done by now. 161 */ 162 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 163 164 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 165 } 166 167 static void 168 compression_changed_cb(void *arg, uint64_t newval) 169 { 170 objset_t *os = arg; 171 172 /* 173 * Inheritance and range checking should have been done by now. 174 */ 175 ASSERT(newval != ZIO_COMPRESS_INHERIT); 176 177 os->os_compress = zio_compress_select(os->os_spa, newval, 178 ZIO_COMPRESS_ON); 179 } 180 181 static void 182 copies_changed_cb(void *arg, uint64_t newval) 183 { 184 objset_t *os = arg; 185 186 /* 187 * Inheritance and range checking should have been done by now. 188 */ 189 ASSERT(newval > 0); 190 ASSERT(newval <= spa_max_replication(os->os_spa)); 191 192 os->os_copies = newval; 193 } 194 195 static void 196 dedup_changed_cb(void *arg, uint64_t newval) 197 { 198 objset_t *os = arg; 199 spa_t *spa = os->os_spa; 200 enum zio_checksum checksum; 201 202 /* 203 * Inheritance should have been done by now. 204 */ 205 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 206 207 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF); 208 209 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK; 210 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY); 211 } 212 213 static void 214 primary_cache_changed_cb(void *arg, uint64_t newval) 215 { 216 objset_t *os = arg; 217 218 /* 219 * Inheritance and range checking should have been done by now. 220 */ 221 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 222 newval == ZFS_CACHE_METADATA); 223 224 os->os_primary_cache = newval; 225 } 226 227 static void 228 secondary_cache_changed_cb(void *arg, uint64_t newval) 229 { 230 objset_t *os = arg; 231 232 /* 233 * Inheritance and range checking should have been done by now. 234 */ 235 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 236 newval == ZFS_CACHE_METADATA); 237 238 os->os_secondary_cache = newval; 239 } 240 241 static void 242 sync_changed_cb(void *arg, uint64_t newval) 243 { 244 objset_t *os = arg; 245 246 /* 247 * Inheritance and range checking should have been done by now. 248 */ 249 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS || 250 newval == ZFS_SYNC_DISABLED); 251 252 os->os_sync = newval; 253 if (os->os_zil) 254 zil_set_sync(os->os_zil, newval); 255 } 256 257 static void 258 redundant_metadata_changed_cb(void *arg, uint64_t newval) 259 { 260 objset_t *os = arg; 261 262 /* 263 * Inheritance and range checking should have been done by now. 264 */ 265 ASSERT(newval == ZFS_REDUNDANT_METADATA_ALL || 266 newval == ZFS_REDUNDANT_METADATA_MOST); 267 268 os->os_redundant_metadata = newval; 269 } 270 271 static void 272 logbias_changed_cb(void *arg, uint64_t newval) 273 { 274 objset_t *os = arg; 275 276 ASSERT(newval == ZFS_LOGBIAS_LATENCY || 277 newval == ZFS_LOGBIAS_THROUGHPUT); 278 os->os_logbias = newval; 279 if (os->os_zil) 280 zil_set_logbias(os->os_zil, newval); 281 } 282 283 static void 284 recordsize_changed_cb(void *arg, uint64_t newval) 285 { 286 objset_t *os = arg; 287 288 os->os_recordsize = newval; 289 } 290 291 void 292 dmu_objset_byteswap(void *buf, size_t size) 293 { 294 objset_phys_t *osp = buf; 295 296 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t)); 297 dnode_byteswap(&osp->os_meta_dnode); 298 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 299 osp->os_type = BSWAP_64(osp->os_type); 300 osp->os_flags = BSWAP_64(osp->os_flags); 301 if (size == sizeof (objset_phys_t)) { 302 dnode_byteswap(&osp->os_userused_dnode); 303 dnode_byteswap(&osp->os_groupused_dnode); 304 } 305 } 306 307 /* 308 * The hash is a CRC-based hash of the objset_t pointer and the object number. 309 */ 310 static uint64_t 311 dnode_hash(const objset_t *os, uint64_t obj) 312 { 313 uintptr_t osv = (uintptr_t)os; 314 uint64_t crc = -1ULL; 315 316 ASSERT(zfs_crc64_table[128] == ZFS_CRC64_POLY); 317 /* 318 * The low 6 bits of the pointer don't have much entropy, because 319 * the objset_t is larger than 2^6 bytes long. 320 */ 321 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (osv >> 6)) & 0xFF]; 322 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 0)) & 0xFF]; 323 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 8)) & 0xFF]; 324 crc = (crc >> 8) ^ zfs_crc64_table[(crc ^ (obj >> 16)) & 0xFF]; 325 326 crc ^= (osv>>14) ^ (obj>>24); 327 328 return (crc); 329 } 330 331 unsigned int 332 dnode_multilist_index_func(multilist_t *ml, void *obj) 333 { 334 dnode_t *dn = obj; 335 return (dnode_hash(dn->dn_objset, dn->dn_object) % 336 multilist_get_num_sublists(ml)); 337 } 338 339 /* 340 * Instantiates the objset_t in-memory structure corresponding to the 341 * objset_phys_t that's pointed to by the specified blkptr_t. 342 */ 343 int 344 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 345 objset_t **osp) 346 { 347 objset_t *os; 348 int i, err; 349 350 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 351 352 /* 353 * The $ORIGIN dataset (if it exists) doesn't have an associated 354 * objset, so there's no reason to open it. The $ORIGIN dataset 355 * will not exist on pools older than SPA_VERSION_ORIGIN. 356 */ 357 if (ds != NULL && spa_get_dsl(spa) != NULL && 358 spa_get_dsl(spa)->dp_origin_snap != NULL) { 359 ASSERT3P(ds->ds_dir, !=, 360 spa_get_dsl(spa)->dp_origin_snap->ds_dir); 361 } 362 363 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP); 364 os->os_dsl_dataset = ds; 365 os->os_spa = spa; 366 os->os_rootbp = bp; 367 if (!BP_IS_HOLE(os->os_rootbp)) { 368 arc_flags_t aflags = ARC_FLAG_WAIT; 369 zbookmark_phys_t zb; 370 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 371 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 372 373 if (DMU_OS_IS_L2CACHEABLE(os)) 374 aflags |= ARC_FLAG_L2CACHE; 375 376 dprintf_bp(os->os_rootbp, "reading %s", ""); 377 err = arc_read(NULL, spa, os->os_rootbp, 378 arc_getbuf_func, &os->os_phys_buf, 379 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 380 if (err != 0) { 381 kmem_free(os, sizeof (objset_t)); 382 /* convert checksum errors into IO errors */ 383 if (err == ECKSUM) 384 err = SET_ERROR(EIO); 385 return (err); 386 } 387 388 /* Increase the blocksize if we are permitted. */ 389 if (spa_version(spa) >= SPA_VERSION_USERSPACE && 390 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) { 391 arc_buf_t *buf = arc_alloc_buf(spa, &os->os_phys_buf, 392 ARC_BUFC_METADATA, sizeof (objset_phys_t)); 393 bzero(buf->b_data, sizeof (objset_phys_t)); 394 bcopy(os->os_phys_buf->b_data, buf->b_data, 395 arc_buf_size(os->os_phys_buf)); 396 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 397 os->os_phys_buf = buf; 398 } 399 400 os->os_phys = os->os_phys_buf->b_data; 401 os->os_flags = os->os_phys->os_flags; 402 } else { 403 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? 404 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; 405 os->os_phys_buf = arc_alloc_buf(spa, &os->os_phys_buf, 406 ARC_BUFC_METADATA, size); 407 os->os_phys = os->os_phys_buf->b_data; 408 bzero(os->os_phys, size); 409 } 410 411 /* 412 * Note: the changed_cb will be called once before the register 413 * func returns, thus changing the checksum/compression from the 414 * default (fletcher2/off). Snapshots don't need to know about 415 * checksum/compression/copies. 416 */ 417 if (ds != NULL) { 418 boolean_t needlock = B_FALSE; 419 420 /* 421 * Note: it's valid to open the objset if the dataset is 422 * long-held, in which case the pool_config lock will not 423 * be held. 424 */ 425 if (!dsl_pool_config_held(dmu_objset_pool(os))) { 426 needlock = B_TRUE; 427 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 428 } 429 err = dsl_prop_register(ds, 430 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE), 431 primary_cache_changed_cb, os); 432 if (err == 0) { 433 err = dsl_prop_register(ds, 434 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE), 435 secondary_cache_changed_cb, os); 436 } 437 if (!ds->ds_is_snapshot) { 438 if (err == 0) { 439 err = dsl_prop_register(ds, 440 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 441 checksum_changed_cb, os); 442 } 443 if (err == 0) { 444 err = dsl_prop_register(ds, 445 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 446 compression_changed_cb, os); 447 } 448 if (err == 0) { 449 err = dsl_prop_register(ds, 450 zfs_prop_to_name(ZFS_PROP_COPIES), 451 copies_changed_cb, os); 452 } 453 if (err == 0) { 454 err = dsl_prop_register(ds, 455 zfs_prop_to_name(ZFS_PROP_DEDUP), 456 dedup_changed_cb, os); 457 } 458 if (err == 0) { 459 err = dsl_prop_register(ds, 460 zfs_prop_to_name(ZFS_PROP_LOGBIAS), 461 logbias_changed_cb, os); 462 } 463 if (err == 0) { 464 err = dsl_prop_register(ds, 465 zfs_prop_to_name(ZFS_PROP_SYNC), 466 sync_changed_cb, os); 467 } 468 if (err == 0) { 469 err = dsl_prop_register(ds, 470 zfs_prop_to_name( 471 ZFS_PROP_REDUNDANT_METADATA), 472 redundant_metadata_changed_cb, os); 473 } 474 if (err == 0) { 475 err = dsl_prop_register(ds, 476 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 477 recordsize_changed_cb, os); 478 } 479 } 480 if (needlock) 481 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 482 if (err != 0) { 483 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 484 kmem_free(os, sizeof (objset_t)); 485 return (err); 486 } 487 } else { 488 /* It's the meta-objset. */ 489 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 490 os->os_compress = ZIO_COMPRESS_ON; 491 os->os_copies = spa_max_replication(spa); 492 os->os_dedup_checksum = ZIO_CHECKSUM_OFF; 493 os->os_dedup_verify = B_FALSE; 494 os->os_logbias = ZFS_LOGBIAS_LATENCY; 495 os->os_sync = ZFS_SYNC_STANDARD; 496 os->os_primary_cache = ZFS_CACHE_ALL; 497 os->os_secondary_cache = ZFS_CACHE_ALL; 498 } 499 /* 500 * These properties will be filled in by the logic in zfs_get_zplprop() 501 * when they are queried for the first time. 502 */ 503 os->os_version = OBJSET_PROP_UNINITIALIZED; 504 os->os_normalization = OBJSET_PROP_UNINITIALIZED; 505 os->os_utf8only = OBJSET_PROP_UNINITIALIZED; 506 os->os_casesensitivity = OBJSET_PROP_UNINITIALIZED; 507 508 if (ds == NULL || !ds->ds_is_snapshot) 509 os->os_zil_header = os->os_phys->os_zil_header; 510 os->os_zil = zil_alloc(os, &os->os_zil_header); 511 512 for (i = 0; i < TXG_SIZE; i++) { 513 os->os_dirty_dnodes[i] = multilist_create(sizeof (dnode_t), 514 offsetof(dnode_t, dn_dirty_link[i]), 515 dnode_multilist_index_func); 516 } 517 list_create(&os->os_dnodes, sizeof (dnode_t), 518 offsetof(dnode_t, dn_link)); 519 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 520 offsetof(dmu_buf_impl_t, db_link)); 521 522 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); 523 mutex_init(&os->os_userused_lock, NULL, MUTEX_DEFAULT, NULL); 524 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 525 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 526 527 dnode_special_open(os, &os->os_phys->os_meta_dnode, 528 DMU_META_DNODE_OBJECT, &os->os_meta_dnode); 529 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) { 530 dnode_special_open(os, &os->os_phys->os_userused_dnode, 531 DMU_USERUSED_OBJECT, &os->os_userused_dnode); 532 dnode_special_open(os, &os->os_phys->os_groupused_dnode, 533 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode); 534 } 535 536 *osp = os; 537 return (0); 538 } 539 540 int 541 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) 542 { 543 int err = 0; 544 545 /* 546 * We shouldn't be doing anything with dsl_dataset_t's unless the 547 * pool_config lock is held, or the dataset is long-held. 548 */ 549 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool) || 550 dsl_dataset_long_held(ds)); 551 552 mutex_enter(&ds->ds_opening_lock); 553 if (ds->ds_objset == NULL) { 554 objset_t *os; 555 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 556 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 557 ds, dsl_dataset_get_blkptr(ds), &os); 558 rrw_exit(&ds->ds_bp_rwlock, FTAG); 559 560 if (err == 0) { 561 mutex_enter(&ds->ds_lock); 562 ASSERT(ds->ds_objset == NULL); 563 ds->ds_objset = os; 564 mutex_exit(&ds->ds_lock); 565 } 566 } 567 *osp = ds->ds_objset; 568 mutex_exit(&ds->ds_opening_lock); 569 return (err); 570 } 571 572 /* 573 * Holds the pool while the objset is held. Therefore only one objset 574 * can be held at a time. 575 */ 576 int 577 dmu_objset_hold(const char *name, void *tag, objset_t **osp) 578 { 579 dsl_pool_t *dp; 580 dsl_dataset_t *ds; 581 int err; 582 583 err = dsl_pool_hold(name, tag, &dp); 584 if (err != 0) 585 return (err); 586 err = dsl_dataset_hold(dp, name, tag, &ds); 587 if (err != 0) { 588 dsl_pool_rele(dp, tag); 589 return (err); 590 } 591 592 err = dmu_objset_from_ds(ds, osp); 593 if (err != 0) { 594 dsl_dataset_rele(ds, tag); 595 dsl_pool_rele(dp, tag); 596 } 597 598 return (err); 599 } 600 601 static int 602 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type, 603 boolean_t readonly, void *tag, objset_t **osp) 604 { 605 int err; 606 607 err = dmu_objset_from_ds(ds, osp); 608 if (err != 0) { 609 dsl_dataset_disown(ds, tag); 610 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) { 611 dsl_dataset_disown(ds, tag); 612 return (SET_ERROR(EINVAL)); 613 } else if (!readonly && dsl_dataset_is_snapshot(ds)) { 614 dsl_dataset_disown(ds, tag); 615 return (SET_ERROR(EROFS)); 616 } 617 return (err); 618 } 619 620 /* 621 * dsl_pool must not be held when this is called. 622 * Upon successful return, there will be a longhold on the dataset, 623 * and the dsl_pool will not be held. 624 */ 625 int 626 dmu_objset_own(const char *name, dmu_objset_type_t type, 627 boolean_t readonly, void *tag, objset_t **osp) 628 { 629 dsl_pool_t *dp; 630 dsl_dataset_t *ds; 631 int err; 632 633 err = dsl_pool_hold(name, FTAG, &dp); 634 if (err != 0) 635 return (err); 636 err = dsl_dataset_own(dp, name, tag, &ds); 637 if (err != 0) { 638 dsl_pool_rele(dp, FTAG); 639 return (err); 640 } 641 err = dmu_objset_own_impl(ds, type, readonly, tag, osp); 642 dsl_pool_rele(dp, FTAG); 643 644 return (err); 645 } 646 647 int 648 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type, 649 boolean_t readonly, void *tag, objset_t **osp) 650 { 651 dsl_dataset_t *ds; 652 int err; 653 654 err = dsl_dataset_own_obj(dp, obj, tag, &ds); 655 if (err != 0) 656 return (err); 657 658 return (dmu_objset_own_impl(ds, type, readonly, tag, osp)); 659 } 660 661 void 662 dmu_objset_rele(objset_t *os, void *tag) 663 { 664 dsl_pool_t *dp = dmu_objset_pool(os); 665 dsl_dataset_rele(os->os_dsl_dataset, tag); 666 dsl_pool_rele(dp, tag); 667 } 668 669 /* 670 * When we are called, os MUST refer to an objset associated with a dataset 671 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner 672 * == tag. We will then release and reacquire ownership of the dataset while 673 * holding the pool config_rwlock to avoid intervening namespace or ownership 674 * changes may occur. 675 * 676 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to 677 * release the hold on its dataset and acquire a new one on the dataset of the 678 * same name so that it can be partially torn down and reconstructed. 679 */ 680 void 681 dmu_objset_refresh_ownership(dsl_dataset_t *ds, dsl_dataset_t **newds, 682 void *tag) 683 { 684 dsl_pool_t *dp; 685 char name[ZFS_MAX_DATASET_NAME_LEN]; 686 687 VERIFY3P(ds, !=, NULL); 688 VERIFY3P(ds->ds_owner, ==, tag); 689 VERIFY(dsl_dataset_long_held(ds)); 690 691 dsl_dataset_name(ds, name); 692 dp = ds->ds_dir->dd_pool; 693 dsl_pool_config_enter(dp, FTAG); 694 dsl_dataset_disown(ds, tag); 695 VERIFY0(dsl_dataset_own(dp, name, tag, newds)); 696 dsl_pool_config_exit(dp, FTAG); 697 } 698 699 void 700 dmu_objset_disown(objset_t *os, void *tag) 701 { 702 dsl_dataset_disown(os->os_dsl_dataset, tag); 703 } 704 705 void 706 dmu_objset_evict_dbufs(objset_t *os) 707 { 708 dnode_t dn_marker; 709 dnode_t *dn; 710 711 mutex_enter(&os->os_lock); 712 dn = list_head(&os->os_dnodes); 713 while (dn != NULL) { 714 /* 715 * Skip dnodes without holds. We have to do this dance 716 * because dnode_add_ref() only works if there is already a 717 * hold. If the dnode has no holds, then it has no dbufs. 718 */ 719 if (dnode_add_ref(dn, FTAG)) { 720 list_insert_after(&os->os_dnodes, dn, &dn_marker); 721 mutex_exit(&os->os_lock); 722 723 dnode_evict_dbufs(dn); 724 dnode_rele(dn, FTAG); 725 726 mutex_enter(&os->os_lock); 727 dn = list_next(&os->os_dnodes, &dn_marker); 728 list_remove(&os->os_dnodes, &dn_marker); 729 } else { 730 dn = list_next(&os->os_dnodes, dn); 731 } 732 } 733 mutex_exit(&os->os_lock); 734 735 if (DMU_USERUSED_DNODE(os) != NULL) { 736 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os)); 737 dnode_evict_dbufs(DMU_USERUSED_DNODE(os)); 738 } 739 dnode_evict_dbufs(DMU_META_DNODE(os)); 740 } 741 742 /* 743 * Objset eviction processing is split into into two pieces. 744 * The first marks the objset as evicting, evicts any dbufs that 745 * have a refcount of zero, and then queues up the objset for the 746 * second phase of eviction. Once os->os_dnodes has been cleared by 747 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed. 748 * The second phase closes the special dnodes, dequeues the objset from 749 * the list of those undergoing eviction, and finally frees the objset. 750 * 751 * NOTE: Due to asynchronous eviction processing (invocation of 752 * dnode_buf_pageout()), it is possible for the meta dnode for the 753 * objset to have no holds even though os->os_dnodes is not empty. 754 */ 755 void 756 dmu_objset_evict(objset_t *os) 757 { 758 dsl_dataset_t *ds = os->os_dsl_dataset; 759 760 for (int t = 0; t < TXG_SIZE; t++) 761 ASSERT(!dmu_objset_is_dirty(os, t)); 762 763 if (ds) 764 dsl_prop_unregister_all(ds, os); 765 766 if (os->os_sa) 767 sa_tear_down(os); 768 769 dmu_objset_evict_dbufs(os); 770 771 mutex_enter(&os->os_lock); 772 spa_evicting_os_register(os->os_spa, os); 773 if (list_is_empty(&os->os_dnodes)) { 774 mutex_exit(&os->os_lock); 775 dmu_objset_evict_done(os); 776 } else { 777 mutex_exit(&os->os_lock); 778 } 779 } 780 781 void 782 dmu_objset_evict_done(objset_t *os) 783 { 784 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 785 786 dnode_special_close(&os->os_meta_dnode); 787 if (DMU_USERUSED_DNODE(os)) { 788 dnode_special_close(&os->os_userused_dnode); 789 dnode_special_close(&os->os_groupused_dnode); 790 } 791 zil_free(os->os_zil); 792 793 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 794 795 /* 796 * This is a barrier to prevent the objset from going away in 797 * dnode_move() until we can safely ensure that the objset is still in 798 * use. We consider the objset valid before the barrier and invalid 799 * after the barrier. 800 */ 801 rw_enter(&os_lock, RW_READER); 802 rw_exit(&os_lock); 803 804 mutex_destroy(&os->os_lock); 805 mutex_destroy(&os->os_userused_lock); 806 mutex_destroy(&os->os_obj_lock); 807 mutex_destroy(&os->os_user_ptr_lock); 808 for (int i = 0; i < TXG_SIZE; i++) { 809 multilist_destroy(os->os_dirty_dnodes[i]); 810 } 811 spa_evicting_os_deregister(os->os_spa, os); 812 kmem_free(os, sizeof (objset_t)); 813 } 814 815 timestruc_t 816 dmu_objset_snap_cmtime(objset_t *os) 817 { 818 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); 819 } 820 821 /* called from dsl for meta-objset */ 822 objset_t * 823 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 824 dmu_objset_type_t type, dmu_tx_t *tx) 825 { 826 objset_t *os; 827 dnode_t *mdn; 828 829 ASSERT(dmu_tx_is_syncing(tx)); 830 831 if (ds != NULL) 832 VERIFY0(dmu_objset_from_ds(ds, &os)); 833 else 834 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os)); 835 836 mdn = DMU_META_DNODE(os); 837 838 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 839 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 840 841 /* 842 * We don't want to have to increase the meta-dnode's nlevels 843 * later, because then we could do it in quescing context while 844 * we are also accessing it in open context. 845 * 846 * This precaution is not necessary for the MOS (ds == NULL), 847 * because the MOS is only updated in syncing context. 848 * This is most fortunate: the MOS is the only objset that 849 * needs to be synced multiple times as spa_sync() iterates 850 * to convergence, so minimizing its dn_nlevels matters. 851 */ 852 if (ds != NULL) { 853 int levels = 1; 854 855 /* 856 * Determine the number of levels necessary for the meta-dnode 857 * to contain DN_MAX_OBJECT dnodes. Note that in order to 858 * ensure that we do not overflow 64 bits, there has to be 859 * a nlevels that gives us a number of blocks > DN_MAX_OBJECT 860 * but < 2^64. Therefore, 861 * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT) (10) must be 862 * less than (64 - log2(DN_MAX_OBJECT)) (16). 863 */ 864 while ((uint64_t)mdn->dn_nblkptr << 865 (mdn->dn_datablkshift - DNODE_SHIFT + 866 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 867 DN_MAX_OBJECT) 868 levels++; 869 870 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 871 mdn->dn_nlevels = levels; 872 } 873 874 ASSERT(type != DMU_OST_NONE); 875 ASSERT(type != DMU_OST_ANY); 876 ASSERT(type < DMU_OST_NUMTYPES); 877 os->os_phys->os_type = type; 878 if (dmu_objset_userused_enabled(os)) { 879 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 880 os->os_flags = os->os_phys->os_flags; 881 } 882 883 dsl_dataset_dirty(ds, tx); 884 885 return (os); 886 } 887 888 typedef struct dmu_objset_create_arg { 889 const char *doca_name; 890 cred_t *doca_cred; 891 void (*doca_userfunc)(objset_t *os, void *arg, 892 cred_t *cr, dmu_tx_t *tx); 893 void *doca_userarg; 894 dmu_objset_type_t doca_type; 895 uint64_t doca_flags; 896 } dmu_objset_create_arg_t; 897 898 /*ARGSUSED*/ 899 static int 900 dmu_objset_create_check(void *arg, dmu_tx_t *tx) 901 { 902 dmu_objset_create_arg_t *doca = arg; 903 dsl_pool_t *dp = dmu_tx_pool(tx); 904 dsl_dir_t *pdd; 905 const char *tail; 906 int error; 907 908 if (strchr(doca->doca_name, '@') != NULL) 909 return (SET_ERROR(EINVAL)); 910 911 if (strlen(doca->doca_name) >= ZFS_MAX_DATASET_NAME_LEN) 912 return (SET_ERROR(ENAMETOOLONG)); 913 914 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail); 915 if (error != 0) 916 return (error); 917 if (tail == NULL) { 918 dsl_dir_rele(pdd, FTAG); 919 return (SET_ERROR(EEXIST)); 920 } 921 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 922 doca->doca_cred); 923 dsl_dir_rele(pdd, FTAG); 924 925 return (error); 926 } 927 928 static void 929 dmu_objset_create_sync(void *arg, dmu_tx_t *tx) 930 { 931 dmu_objset_create_arg_t *doca = arg; 932 dsl_pool_t *dp = dmu_tx_pool(tx); 933 dsl_dir_t *pdd; 934 const char *tail; 935 dsl_dataset_t *ds; 936 uint64_t obj; 937 blkptr_t *bp; 938 objset_t *os; 939 940 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail)); 941 942 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags, 943 doca->doca_cred, tx); 944 945 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 946 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 947 bp = dsl_dataset_get_blkptr(ds); 948 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa, 949 ds, bp, doca->doca_type, tx); 950 rrw_exit(&ds->ds_bp_rwlock, FTAG); 951 952 if (doca->doca_userfunc != NULL) { 953 doca->doca_userfunc(os, doca->doca_userarg, 954 doca->doca_cred, tx); 955 } 956 957 spa_history_log_internal_ds(ds, "create", tx, ""); 958 dsl_dataset_rele(ds, FTAG); 959 dsl_dir_rele(pdd, FTAG); 960 } 961 962 int 963 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 964 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 965 { 966 dmu_objset_create_arg_t doca; 967 968 doca.doca_name = name; 969 doca.doca_cred = CRED(); 970 doca.doca_flags = flags; 971 doca.doca_userfunc = func; 972 doca.doca_userarg = arg; 973 doca.doca_type = type; 974 975 return (dsl_sync_task(name, 976 dmu_objset_create_check, dmu_objset_create_sync, &doca, 977 5, ZFS_SPACE_CHECK_NORMAL)); 978 } 979 980 typedef struct dmu_objset_clone_arg { 981 const char *doca_clone; 982 const char *doca_origin; 983 cred_t *doca_cred; 984 } dmu_objset_clone_arg_t; 985 986 /*ARGSUSED*/ 987 static int 988 dmu_objset_clone_check(void *arg, dmu_tx_t *tx) 989 { 990 dmu_objset_clone_arg_t *doca = arg; 991 dsl_dir_t *pdd; 992 const char *tail; 993 int error; 994 dsl_dataset_t *origin; 995 dsl_pool_t *dp = dmu_tx_pool(tx); 996 997 if (strchr(doca->doca_clone, '@') != NULL) 998 return (SET_ERROR(EINVAL)); 999 1000 if (strlen(doca->doca_clone) >= ZFS_MAX_DATASET_NAME_LEN) 1001 return (SET_ERROR(ENAMETOOLONG)); 1002 1003 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail); 1004 if (error != 0) 1005 return (error); 1006 if (tail == NULL) { 1007 dsl_dir_rele(pdd, FTAG); 1008 return (SET_ERROR(EEXIST)); 1009 } 1010 1011 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 1012 doca->doca_cred); 1013 if (error != 0) { 1014 dsl_dir_rele(pdd, FTAG); 1015 return (SET_ERROR(EDQUOT)); 1016 } 1017 dsl_dir_rele(pdd, FTAG); 1018 1019 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin); 1020 if (error != 0) 1021 return (error); 1022 1023 /* You can only clone snapshots, not the head datasets. */ 1024 if (!origin->ds_is_snapshot) { 1025 dsl_dataset_rele(origin, FTAG); 1026 return (SET_ERROR(EINVAL)); 1027 } 1028 dsl_dataset_rele(origin, FTAG); 1029 1030 return (0); 1031 } 1032 1033 static void 1034 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx) 1035 { 1036 dmu_objset_clone_arg_t *doca = arg; 1037 dsl_pool_t *dp = dmu_tx_pool(tx); 1038 dsl_dir_t *pdd; 1039 const char *tail; 1040 dsl_dataset_t *origin, *ds; 1041 uint64_t obj; 1042 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 1043 1044 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail)); 1045 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin)); 1046 1047 obj = dsl_dataset_create_sync(pdd, tail, origin, 0, 1048 doca->doca_cred, tx); 1049 1050 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 1051 dsl_dataset_name(origin, namebuf); 1052 spa_history_log_internal_ds(ds, "clone", tx, 1053 "origin=%s (%llu)", namebuf, origin->ds_object); 1054 dsl_dataset_rele(ds, FTAG); 1055 dsl_dataset_rele(origin, FTAG); 1056 dsl_dir_rele(pdd, FTAG); 1057 } 1058 1059 int 1060 dmu_objset_clone(const char *clone, const char *origin) 1061 { 1062 dmu_objset_clone_arg_t doca; 1063 1064 doca.doca_clone = clone; 1065 doca.doca_origin = origin; 1066 doca.doca_cred = CRED(); 1067 1068 return (dsl_sync_task(clone, 1069 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 1070 5, ZFS_SPACE_CHECK_NORMAL)); 1071 } 1072 1073 static int 1074 dmu_objset_remap_indirects_impl(objset_t *os, uint64_t last_removed_txg) 1075 { 1076 int error = 0; 1077 uint64_t object = 0; 1078 while ((error = dmu_object_next(os, &object, B_FALSE, 0)) == 0) { 1079 error = dmu_object_remap_indirects(os, object, 1080 last_removed_txg); 1081 /* 1082 * If the ZPL removed the object before we managed to dnode_hold 1083 * it, we would get an ENOENT. If the ZPL declares its intent 1084 * to remove the object (dnode_free) before we manage to 1085 * dnode_hold it, we would get an EEXIST. In either case, we 1086 * want to continue remapping the other objects in the objset; 1087 * in all other cases, we want to break early. 1088 */ 1089 if (error != 0 && error != ENOENT && error != EEXIST) { 1090 break; 1091 } 1092 } 1093 if (error == ESRCH) { 1094 error = 0; 1095 } 1096 return (error); 1097 } 1098 1099 int 1100 dmu_objset_remap_indirects(const char *fsname) 1101 { 1102 int error = 0; 1103 objset_t *os = NULL; 1104 uint64_t last_removed_txg; 1105 uint64_t remap_start_txg; 1106 dsl_dir_t *dd; 1107 1108 error = dmu_objset_hold(fsname, FTAG, &os); 1109 if (error != 0) { 1110 return (error); 1111 } 1112 dd = dmu_objset_ds(os)->ds_dir; 1113 1114 if (!spa_feature_is_enabled(dmu_objset_spa(os), 1115 SPA_FEATURE_OBSOLETE_COUNTS)) { 1116 dmu_objset_rele(os, FTAG); 1117 return (SET_ERROR(ENOTSUP)); 1118 } 1119 1120 if (dsl_dataset_is_snapshot(dmu_objset_ds(os))) { 1121 dmu_objset_rele(os, FTAG); 1122 return (SET_ERROR(EINVAL)); 1123 } 1124 1125 /* 1126 * If there has not been a removal, we're done. 1127 */ 1128 last_removed_txg = spa_get_last_removal_txg(dmu_objset_spa(os)); 1129 if (last_removed_txg == -1ULL) { 1130 dmu_objset_rele(os, FTAG); 1131 return (0); 1132 } 1133 1134 /* 1135 * If we have remapped since the last removal, we're done. 1136 */ 1137 if (dsl_dir_is_zapified(dd)) { 1138 uint64_t last_remap_txg; 1139 if (zap_lookup(spa_meta_objset(dmu_objset_spa(os)), 1140 dd->dd_object, DD_FIELD_LAST_REMAP_TXG, 1141 sizeof (last_remap_txg), 1, &last_remap_txg) == 0 && 1142 last_remap_txg > last_removed_txg) { 1143 dmu_objset_rele(os, FTAG); 1144 return (0); 1145 } 1146 } 1147 1148 dsl_dataset_long_hold(dmu_objset_ds(os), FTAG); 1149 dsl_pool_rele(dmu_objset_pool(os), FTAG); 1150 1151 remap_start_txg = spa_last_synced_txg(dmu_objset_spa(os)); 1152 error = dmu_objset_remap_indirects_impl(os, last_removed_txg); 1153 if (error == 0) { 1154 /* 1155 * We update the last_remap_txg to be the start txg so that 1156 * we can guarantee that every block older than last_remap_txg 1157 * that can be remapped has been remapped. 1158 */ 1159 error = dsl_dir_update_last_remap_txg(dd, remap_start_txg); 1160 } 1161 1162 dsl_dataset_long_rele(dmu_objset_ds(os), FTAG); 1163 dsl_dataset_rele(dmu_objset_ds(os), FTAG); 1164 1165 return (error); 1166 } 1167 1168 int 1169 dmu_objset_snapshot_one(const char *fsname, const char *snapname) 1170 { 1171 int err; 1172 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname); 1173 nvlist_t *snaps = fnvlist_alloc(); 1174 1175 fnvlist_add_boolean(snaps, longsnap); 1176 strfree(longsnap); 1177 err = dsl_dataset_snapshot(snaps, NULL, NULL); 1178 fnvlist_free(snaps); 1179 return (err); 1180 } 1181 1182 static void 1183 dmu_objset_sync_dnodes(multilist_sublist_t *list, dmu_tx_t *tx) 1184 { 1185 dnode_t *dn; 1186 1187 while ((dn = multilist_sublist_head(list)) != NULL) { 1188 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 1189 ASSERT(dn->dn_dbuf->db_data_pending); 1190 /* 1191 * Initialize dn_zio outside dnode_sync() because the 1192 * meta-dnode needs to set it ouside dnode_sync(). 1193 */ 1194 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 1195 ASSERT(dn->dn_zio); 1196 1197 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 1198 multilist_sublist_remove(list, dn); 1199 1200 multilist_t *newlist = dn->dn_objset->os_synced_dnodes; 1201 if (newlist != NULL) { 1202 (void) dnode_add_ref(dn, newlist); 1203 multilist_insert(newlist, dn); 1204 } 1205 1206 dnode_sync(dn, tx); 1207 } 1208 } 1209 1210 /* ARGSUSED */ 1211 static void 1212 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) 1213 { 1214 blkptr_t *bp = zio->io_bp; 1215 objset_t *os = arg; 1216 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 1217 1218 ASSERT(!BP_IS_EMBEDDED(bp)); 1219 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET); 1220 ASSERT0(BP_GET_LEVEL(bp)); 1221 1222 /* 1223 * Update rootbp fill count: it should be the number of objects 1224 * allocated in the object set (not counting the "special" 1225 * objects that are stored in the objset_phys_t -- the meta 1226 * dnode and user/group accounting objects). 1227 */ 1228 bp->blk_fill = 0; 1229 for (int i = 0; i < dnp->dn_nblkptr; i++) 1230 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]); 1231 if (os->os_dsl_dataset != NULL) 1232 rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_WRITER, FTAG); 1233 *os->os_rootbp = *bp; 1234 if (os->os_dsl_dataset != NULL) 1235 rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); 1236 } 1237 1238 /* ARGSUSED */ 1239 static void 1240 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) 1241 { 1242 blkptr_t *bp = zio->io_bp; 1243 blkptr_t *bp_orig = &zio->io_bp_orig; 1244 objset_t *os = arg; 1245 1246 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 1247 ASSERT(BP_EQUAL(bp, bp_orig)); 1248 } else { 1249 dsl_dataset_t *ds = os->os_dsl_dataset; 1250 dmu_tx_t *tx = os->os_synctx; 1251 1252 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 1253 dsl_dataset_block_born(ds, bp, tx); 1254 } 1255 kmem_free(bp, sizeof (*bp)); 1256 } 1257 1258 typedef struct sync_dnodes_arg { 1259 multilist_t *sda_list; 1260 int sda_sublist_idx; 1261 multilist_t *sda_newlist; 1262 dmu_tx_t *sda_tx; 1263 } sync_dnodes_arg_t; 1264 1265 static void 1266 sync_dnodes_task(void *arg) 1267 { 1268 sync_dnodes_arg_t *sda = arg; 1269 1270 multilist_sublist_t *ms = 1271 multilist_sublist_lock(sda->sda_list, sda->sda_sublist_idx); 1272 1273 dmu_objset_sync_dnodes(ms, sda->sda_tx); 1274 1275 multilist_sublist_unlock(ms); 1276 1277 kmem_free(sda, sizeof (*sda)); 1278 } 1279 1280 1281 /* called from dsl */ 1282 void 1283 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 1284 { 1285 int txgoff; 1286 zbookmark_phys_t zb; 1287 zio_prop_t zp; 1288 zio_t *zio; 1289 list_t *list; 1290 dbuf_dirty_record_t *dr; 1291 blkptr_t *blkptr_copy = kmem_alloc(sizeof (*os->os_rootbp), KM_SLEEP); 1292 *blkptr_copy = *os->os_rootbp; 1293 1294 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 1295 1296 ASSERT(dmu_tx_is_syncing(tx)); 1297 /* XXX the write_done callback should really give us the tx... */ 1298 os->os_synctx = tx; 1299 1300 if (os->os_dsl_dataset == NULL) { 1301 /* 1302 * This is the MOS. If we have upgraded, 1303 * spa_max_replication() could change, so reset 1304 * os_copies here. 1305 */ 1306 os->os_copies = spa_max_replication(os->os_spa); 1307 } 1308 1309 /* 1310 * Create the root block IO 1311 */ 1312 SET_BOOKMARK(&zb, os->os_dsl_dataset ? 1313 os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1314 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 1315 arc_release(os->os_phys_buf, &os->os_phys_buf); 1316 1317 dmu_write_policy(os, NULL, 0, 0, &zp); 1318 1319 zio = arc_write(pio, os->os_spa, tx->tx_txg, 1320 blkptr_copy, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), 1321 &zp, dmu_objset_write_ready, NULL, NULL, dmu_objset_write_done, 1322 os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 1323 1324 /* 1325 * Sync special dnodes - the parent IO for the sync is the root block 1326 */ 1327 DMU_META_DNODE(os)->dn_zio = zio; 1328 dnode_sync(DMU_META_DNODE(os), tx); 1329 1330 os->os_phys->os_flags = os->os_flags; 1331 1332 if (DMU_USERUSED_DNODE(os) && 1333 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { 1334 DMU_USERUSED_DNODE(os)->dn_zio = zio; 1335 dnode_sync(DMU_USERUSED_DNODE(os), tx); 1336 DMU_GROUPUSED_DNODE(os)->dn_zio = zio; 1337 dnode_sync(DMU_GROUPUSED_DNODE(os), tx); 1338 } 1339 1340 txgoff = tx->tx_txg & TXG_MASK; 1341 1342 if (dmu_objset_userused_enabled(os)) { 1343 /* 1344 * We must create the list here because it uses the 1345 * dn_dirty_link[] of this txg. But it may already 1346 * exist because we call dsl_dataset_sync() twice per txg. 1347 */ 1348 if (os->os_synced_dnodes == NULL) { 1349 os->os_synced_dnodes = 1350 multilist_create(sizeof (dnode_t), 1351 offsetof(dnode_t, dn_dirty_link[txgoff]), 1352 dnode_multilist_index_func); 1353 } else { 1354 ASSERT3U(os->os_synced_dnodes->ml_offset, ==, 1355 offsetof(dnode_t, dn_dirty_link[txgoff])); 1356 } 1357 } 1358 1359 for (int i = 0; 1360 i < multilist_get_num_sublists(os->os_dirty_dnodes[txgoff]); i++) { 1361 sync_dnodes_arg_t *sda = kmem_alloc(sizeof (*sda), KM_SLEEP); 1362 sda->sda_list = os->os_dirty_dnodes[txgoff]; 1363 sda->sda_sublist_idx = i; 1364 sda->sda_tx = tx; 1365 (void) taskq_dispatch(dmu_objset_pool(os)->dp_sync_taskq, 1366 sync_dnodes_task, sda, 0); 1367 /* callback frees sda */ 1368 } 1369 taskq_wait(dmu_objset_pool(os)->dp_sync_taskq); 1370 1371 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; 1372 while ((dr = list_head(list)) != NULL) { 1373 ASSERT0(dr->dr_dbuf->db_level); 1374 list_remove(list, dr); 1375 if (dr->dr_zio) 1376 zio_nowait(dr->dr_zio); 1377 } 1378 1379 /* Enable dnode backfill if enough objects have been freed. */ 1380 if (os->os_freed_dnodes >= dmu_rescan_dnode_threshold) { 1381 os->os_rescan_dnodes = B_TRUE; 1382 os->os_freed_dnodes = 0; 1383 } 1384 1385 /* 1386 * Free intent log blocks up to this tx. 1387 */ 1388 zil_sync(os->os_zil, tx); 1389 os->os_phys->os_zil_header = os->os_zil_header; 1390 zio_nowait(zio); 1391 } 1392 1393 boolean_t 1394 dmu_objset_is_dirty(objset_t *os, uint64_t txg) 1395 { 1396 return (!multilist_is_empty(os->os_dirty_dnodes[txg & TXG_MASK])); 1397 } 1398 1399 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1400 1401 void 1402 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1403 { 1404 used_cbs[ost] = cb; 1405 } 1406 1407 boolean_t 1408 dmu_objset_userused_enabled(objset_t *os) 1409 { 1410 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1411 used_cbs[os->os_phys->os_type] != NULL && 1412 DMU_USERUSED_DNODE(os) != NULL); 1413 } 1414 1415 typedef struct userquota_node { 1416 uint64_t uqn_id; 1417 int64_t uqn_delta; 1418 avl_node_t uqn_node; 1419 } userquota_node_t; 1420 1421 typedef struct userquota_cache { 1422 avl_tree_t uqc_user_deltas; 1423 avl_tree_t uqc_group_deltas; 1424 } userquota_cache_t; 1425 1426 static int 1427 userquota_compare(const void *l, const void *r) 1428 { 1429 const userquota_node_t *luqn = l; 1430 const userquota_node_t *ruqn = r; 1431 1432 if (luqn->uqn_id < ruqn->uqn_id) 1433 return (-1); 1434 if (luqn->uqn_id > ruqn->uqn_id) 1435 return (1); 1436 return (0); 1437 } 1438 1439 static void 1440 do_userquota_cacheflush(objset_t *os, userquota_cache_t *cache, dmu_tx_t *tx) 1441 { 1442 void *cookie; 1443 userquota_node_t *uqn; 1444 1445 ASSERT(dmu_tx_is_syncing(tx)); 1446 1447 cookie = NULL; 1448 while ((uqn = avl_destroy_nodes(&cache->uqc_user_deltas, 1449 &cookie)) != NULL) { 1450 /* 1451 * os_userused_lock protects against concurrent calls to 1452 * zap_increment_int(). It's needed because zap_increment_int() 1453 * is not thread-safe (i.e. not atomic). 1454 */ 1455 mutex_enter(&os->os_userused_lock); 1456 VERIFY0(zap_increment_int(os, DMU_USERUSED_OBJECT, 1457 uqn->uqn_id, uqn->uqn_delta, tx)); 1458 mutex_exit(&os->os_userused_lock); 1459 kmem_free(uqn, sizeof (*uqn)); 1460 } 1461 avl_destroy(&cache->uqc_user_deltas); 1462 1463 cookie = NULL; 1464 while ((uqn = avl_destroy_nodes(&cache->uqc_group_deltas, 1465 &cookie)) != NULL) { 1466 mutex_enter(&os->os_userused_lock); 1467 VERIFY0(zap_increment_int(os, DMU_GROUPUSED_OBJECT, 1468 uqn->uqn_id, uqn->uqn_delta, tx)); 1469 mutex_exit(&os->os_userused_lock); 1470 kmem_free(uqn, sizeof (*uqn)); 1471 } 1472 avl_destroy(&cache->uqc_group_deltas); 1473 } 1474 1475 static void 1476 userquota_update_cache(avl_tree_t *avl, uint64_t id, int64_t delta) 1477 { 1478 userquota_node_t search = { .uqn_id = id }; 1479 avl_index_t idx; 1480 1481 userquota_node_t *uqn = avl_find(avl, &search, &idx); 1482 if (uqn == NULL) { 1483 uqn = kmem_zalloc(sizeof (*uqn), KM_SLEEP); 1484 uqn->uqn_id = id; 1485 avl_insert(avl, uqn, idx); 1486 } 1487 uqn->uqn_delta += delta; 1488 } 1489 1490 static void 1491 do_userquota_update(userquota_cache_t *cache, uint64_t used, uint64_t flags, 1492 uint64_t user, uint64_t group, boolean_t subtract) 1493 { 1494 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { 1495 int64_t delta = DNODE_SIZE + used; 1496 if (subtract) 1497 delta = -delta; 1498 1499 userquota_update_cache(&cache->uqc_user_deltas, user, delta); 1500 userquota_update_cache(&cache->uqc_group_deltas, group, delta); 1501 } 1502 } 1503 1504 typedef struct userquota_updates_arg { 1505 objset_t *uua_os; 1506 int uua_sublist_idx; 1507 dmu_tx_t *uua_tx; 1508 } userquota_updates_arg_t; 1509 1510 static void 1511 userquota_updates_task(void *arg) 1512 { 1513 userquota_updates_arg_t *uua = arg; 1514 objset_t *os = uua->uua_os; 1515 dmu_tx_t *tx = uua->uua_tx; 1516 dnode_t *dn; 1517 userquota_cache_t cache = { 0 }; 1518 1519 multilist_sublist_t *list = 1520 multilist_sublist_lock(os->os_synced_dnodes, uua->uua_sublist_idx); 1521 1522 ASSERT(multilist_sublist_head(list) == NULL || 1523 dmu_objset_userused_enabled(os)); 1524 avl_create(&cache.uqc_user_deltas, userquota_compare, 1525 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node)); 1526 avl_create(&cache.uqc_group_deltas, userquota_compare, 1527 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node)); 1528 1529 while ((dn = multilist_sublist_head(list)) != NULL) { 1530 int flags; 1531 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1532 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1533 dn->dn_phys->dn_flags & 1534 DNODE_FLAG_USERUSED_ACCOUNTED); 1535 1536 flags = dn->dn_id_flags; 1537 ASSERT(flags); 1538 if (flags & DN_ID_OLD_EXIST) { 1539 do_userquota_update(&cache, 1540 dn->dn_oldused, dn->dn_oldflags, 1541 dn->dn_olduid, dn->dn_oldgid, B_TRUE); 1542 } 1543 if (flags & DN_ID_NEW_EXIST) { 1544 do_userquota_update(&cache, 1545 DN_USED_BYTES(dn->dn_phys), 1546 dn->dn_phys->dn_flags, dn->dn_newuid, 1547 dn->dn_newgid, B_FALSE); 1548 } 1549 1550 mutex_enter(&dn->dn_mtx); 1551 dn->dn_oldused = 0; 1552 dn->dn_oldflags = 0; 1553 if (dn->dn_id_flags & DN_ID_NEW_EXIST) { 1554 dn->dn_olduid = dn->dn_newuid; 1555 dn->dn_oldgid = dn->dn_newgid; 1556 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1557 if (dn->dn_bonuslen == 0) 1558 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1559 else 1560 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1561 } 1562 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); 1563 mutex_exit(&dn->dn_mtx); 1564 1565 multilist_sublist_remove(list, dn); 1566 dnode_rele(dn, os->os_synced_dnodes); 1567 } 1568 do_userquota_cacheflush(os, &cache, tx); 1569 multilist_sublist_unlock(list); 1570 kmem_free(uua, sizeof (*uua)); 1571 } 1572 1573 void 1574 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) 1575 { 1576 if (!dmu_objset_userused_enabled(os)) 1577 return; 1578 1579 /* Allocate the user/groupused objects if necessary. */ 1580 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { 1581 VERIFY0(zap_create_claim(os, 1582 DMU_USERUSED_OBJECT, 1583 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1584 VERIFY0(zap_create_claim(os, 1585 DMU_GROUPUSED_OBJECT, 1586 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1587 } 1588 1589 for (int i = 0; 1590 i < multilist_get_num_sublists(os->os_synced_dnodes); i++) { 1591 userquota_updates_arg_t *uua = 1592 kmem_alloc(sizeof (*uua), KM_SLEEP); 1593 uua->uua_os = os; 1594 uua->uua_sublist_idx = i; 1595 uua->uua_tx = tx; 1596 /* note: caller does taskq_wait() */ 1597 (void) taskq_dispatch(dmu_objset_pool(os)->dp_sync_taskq, 1598 userquota_updates_task, uua, 0); 1599 /* callback frees uua */ 1600 } 1601 } 1602 1603 /* 1604 * Returns a pointer to data to find uid/gid from 1605 * 1606 * If a dirty record for transaction group that is syncing can't 1607 * be found then NULL is returned. In the NULL case it is assumed 1608 * the uid/gid aren't changing. 1609 */ 1610 static void * 1611 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) 1612 { 1613 dbuf_dirty_record_t *dr, **drp; 1614 void *data; 1615 1616 if (db->db_dirtycnt == 0) 1617 return (db->db.db_data); /* Nothing is changing */ 1618 1619 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1620 if (dr->dr_txg == tx->tx_txg) 1621 break; 1622 1623 if (dr == NULL) { 1624 data = NULL; 1625 } else { 1626 dnode_t *dn; 1627 1628 DB_DNODE_ENTER(dr->dr_dbuf); 1629 dn = DB_DNODE(dr->dr_dbuf); 1630 1631 if (dn->dn_bonuslen == 0 && 1632 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) 1633 data = dr->dt.dl.dr_data->b_data; 1634 else 1635 data = dr->dt.dl.dr_data; 1636 1637 DB_DNODE_EXIT(dr->dr_dbuf); 1638 } 1639 1640 return (data); 1641 } 1642 1643 void 1644 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) 1645 { 1646 objset_t *os = dn->dn_objset; 1647 void *data = NULL; 1648 dmu_buf_impl_t *db = NULL; 1649 uint64_t *user = NULL; 1650 uint64_t *group = NULL; 1651 int flags = dn->dn_id_flags; 1652 int error; 1653 boolean_t have_spill = B_FALSE; 1654 1655 if (!dmu_objset_userused_enabled(dn->dn_objset)) 1656 return; 1657 1658 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| 1659 DN_ID_CHKED_SPILL))) 1660 return; 1661 1662 if (before && dn->dn_bonuslen != 0) 1663 data = DN_BONUS(dn->dn_phys); 1664 else if (!before && dn->dn_bonuslen != 0) { 1665 if (dn->dn_bonus) { 1666 db = dn->dn_bonus; 1667 mutex_enter(&db->db_mtx); 1668 data = dmu_objset_userquota_find_data(db, tx); 1669 } else { 1670 data = DN_BONUS(dn->dn_phys); 1671 } 1672 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { 1673 int rf = 0; 1674 1675 if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) 1676 rf |= DB_RF_HAVESTRUCT; 1677 error = dmu_spill_hold_by_dnode(dn, 1678 rf | DB_RF_MUST_SUCCEED, 1679 FTAG, (dmu_buf_t **)&db); 1680 ASSERT(error == 0); 1681 mutex_enter(&db->db_mtx); 1682 data = (before) ? db->db.db_data : 1683 dmu_objset_userquota_find_data(db, tx); 1684 have_spill = B_TRUE; 1685 } else { 1686 mutex_enter(&dn->dn_mtx); 1687 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1688 mutex_exit(&dn->dn_mtx); 1689 return; 1690 } 1691 1692 if (before) { 1693 ASSERT(data); 1694 user = &dn->dn_olduid; 1695 group = &dn->dn_oldgid; 1696 } else if (data) { 1697 user = &dn->dn_newuid; 1698 group = &dn->dn_newgid; 1699 } 1700 1701 /* 1702 * Must always call the callback in case the object 1703 * type has changed and that type isn't an object type to track 1704 */ 1705 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, 1706 user, group); 1707 1708 /* 1709 * Preserve existing uid/gid when the callback can't determine 1710 * what the new uid/gid are and the callback returned EEXIST. 1711 * The EEXIST error tells us to just use the existing uid/gid. 1712 * If we don't know what the old values are then just assign 1713 * them to 0, since that is a new file being created. 1714 */ 1715 if (!before && data == NULL && error == EEXIST) { 1716 if (flags & DN_ID_OLD_EXIST) { 1717 dn->dn_newuid = dn->dn_olduid; 1718 dn->dn_newgid = dn->dn_oldgid; 1719 } else { 1720 dn->dn_newuid = 0; 1721 dn->dn_newgid = 0; 1722 } 1723 error = 0; 1724 } 1725 1726 if (db) 1727 mutex_exit(&db->db_mtx); 1728 1729 mutex_enter(&dn->dn_mtx); 1730 if (error == 0 && before) 1731 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1732 if (error == 0 && !before) 1733 dn->dn_id_flags |= DN_ID_NEW_EXIST; 1734 1735 if (have_spill) { 1736 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1737 } else { 1738 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1739 } 1740 mutex_exit(&dn->dn_mtx); 1741 if (have_spill) 1742 dmu_buf_rele((dmu_buf_t *)db, FTAG); 1743 } 1744 1745 boolean_t 1746 dmu_objset_userspace_present(objset_t *os) 1747 { 1748 return (os->os_phys->os_flags & 1749 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1750 } 1751 1752 int 1753 dmu_objset_userspace_upgrade(objset_t *os) 1754 { 1755 uint64_t obj; 1756 int err = 0; 1757 1758 if (dmu_objset_userspace_present(os)) 1759 return (0); 1760 if (!dmu_objset_userused_enabled(os)) 1761 return (SET_ERROR(ENOTSUP)); 1762 if (dmu_objset_is_snapshot(os)) 1763 return (SET_ERROR(EINVAL)); 1764 1765 /* 1766 * We simply need to mark every object dirty, so that it will be 1767 * synced out and now accounted. If this is called 1768 * concurrently, or if we already did some work before crashing, 1769 * that's fine, since we track each object's accounted state 1770 * independently. 1771 */ 1772 1773 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1774 dmu_tx_t *tx; 1775 dmu_buf_t *db; 1776 int objerr; 1777 1778 if (issig(JUSTLOOKING) && issig(FORREAL)) 1779 return (SET_ERROR(EINTR)); 1780 1781 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1782 if (objerr != 0) 1783 continue; 1784 tx = dmu_tx_create(os); 1785 dmu_tx_hold_bonus(tx, obj); 1786 objerr = dmu_tx_assign(tx, TXG_WAIT); 1787 if (objerr != 0) { 1788 dmu_tx_abort(tx); 1789 continue; 1790 } 1791 dmu_buf_will_dirty(db, tx); 1792 dmu_buf_rele(db, FTAG); 1793 dmu_tx_commit(tx); 1794 } 1795 1796 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1797 txg_wait_synced(dmu_objset_pool(os), 0); 1798 return (0); 1799 } 1800 1801 void 1802 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1803 uint64_t *usedobjsp, uint64_t *availobjsp) 1804 { 1805 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 1806 usedobjsp, availobjsp); 1807 } 1808 1809 uint64_t 1810 dmu_objset_fsid_guid(objset_t *os) 1811 { 1812 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 1813 } 1814 1815 void 1816 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1817 { 1818 stat->dds_type = os->os_phys->os_type; 1819 if (os->os_dsl_dataset) 1820 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 1821 } 1822 1823 void 1824 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1825 { 1826 ASSERT(os->os_dsl_dataset || 1827 os->os_phys->os_type == DMU_OST_META); 1828 1829 if (os->os_dsl_dataset != NULL) 1830 dsl_dataset_stats(os->os_dsl_dataset, nv); 1831 1832 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1833 os->os_phys->os_type); 1834 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1835 dmu_objset_userspace_present(os)); 1836 } 1837 1838 int 1839 dmu_objset_is_snapshot(objset_t *os) 1840 { 1841 if (os->os_dsl_dataset != NULL) 1842 return (os->os_dsl_dataset->ds_is_snapshot); 1843 else 1844 return (B_FALSE); 1845 } 1846 1847 int 1848 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1849 boolean_t *conflict) 1850 { 1851 dsl_dataset_t *ds = os->os_dsl_dataset; 1852 uint64_t ignored; 1853 1854 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1855 return (SET_ERROR(ENOENT)); 1856 1857 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1858 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored, 1859 MT_NORMALIZE, real, maxlen, conflict)); 1860 } 1861 1862 int 1863 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1864 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1865 { 1866 dsl_dataset_t *ds = os->os_dsl_dataset; 1867 zap_cursor_t cursor; 1868 zap_attribute_t attr; 1869 1870 ASSERT(dsl_pool_config_held(dmu_objset_pool(os))); 1871 1872 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1873 return (SET_ERROR(ENOENT)); 1874 1875 zap_cursor_init_serialized(&cursor, 1876 ds->ds_dir->dd_pool->dp_meta_objset, 1877 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp); 1878 1879 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1880 zap_cursor_fini(&cursor); 1881 return (SET_ERROR(ENOENT)); 1882 } 1883 1884 if (strlen(attr.za_name) + 1 > namelen) { 1885 zap_cursor_fini(&cursor); 1886 return (SET_ERROR(ENAMETOOLONG)); 1887 } 1888 1889 (void) strcpy(name, attr.za_name); 1890 if (idp) 1891 *idp = attr.za_first_integer; 1892 if (case_conflict) 1893 *case_conflict = attr.za_normalization_conflict; 1894 zap_cursor_advance(&cursor); 1895 *offp = zap_cursor_serialize(&cursor); 1896 zap_cursor_fini(&cursor); 1897 1898 return (0); 1899 } 1900 1901 int 1902 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1903 uint64_t *idp, uint64_t *offp) 1904 { 1905 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1906 zap_cursor_t cursor; 1907 zap_attribute_t attr; 1908 1909 /* there is no next dir on a snapshot! */ 1910 if (os->os_dsl_dataset->ds_object != 1911 dsl_dir_phys(dd)->dd_head_dataset_obj) 1912 return (SET_ERROR(ENOENT)); 1913 1914 zap_cursor_init_serialized(&cursor, 1915 dd->dd_pool->dp_meta_objset, 1916 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp); 1917 1918 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1919 zap_cursor_fini(&cursor); 1920 return (SET_ERROR(ENOENT)); 1921 } 1922 1923 if (strlen(attr.za_name) + 1 > namelen) { 1924 zap_cursor_fini(&cursor); 1925 return (SET_ERROR(ENAMETOOLONG)); 1926 } 1927 1928 (void) strcpy(name, attr.za_name); 1929 if (idp) 1930 *idp = attr.za_first_integer; 1931 zap_cursor_advance(&cursor); 1932 *offp = zap_cursor_serialize(&cursor); 1933 zap_cursor_fini(&cursor); 1934 1935 return (0); 1936 } 1937 1938 typedef struct dmu_objset_find_ctx { 1939 taskq_t *dc_tq; 1940 dsl_pool_t *dc_dp; 1941 uint64_t dc_ddobj; 1942 char *dc_ddname; /* last component of ddobj's name */ 1943 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *); 1944 void *dc_arg; 1945 int dc_flags; 1946 kmutex_t *dc_error_lock; 1947 int *dc_error; 1948 } dmu_objset_find_ctx_t; 1949 1950 static void 1951 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp) 1952 { 1953 dsl_pool_t *dp = dcp->dc_dp; 1954 dsl_dir_t *dd; 1955 dsl_dataset_t *ds; 1956 zap_cursor_t zc; 1957 zap_attribute_t *attr; 1958 uint64_t thisobj; 1959 int err = 0; 1960 1961 /* don't process if there already was an error */ 1962 if (*dcp->dc_error != 0) 1963 goto out; 1964 1965 /* 1966 * Note: passing the name (dc_ddname) here is optional, but it 1967 * improves performance because we don't need to call 1968 * zap_value_search() to determine the name. 1969 */ 1970 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, dcp->dc_ddname, FTAG, &dd); 1971 if (err != 0) 1972 goto out; 1973 1974 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1975 if (dd->dd_myname[0] == '$') { 1976 dsl_dir_rele(dd, FTAG); 1977 goto out; 1978 } 1979 1980 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1981 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1982 1983 /* 1984 * Iterate over all children. 1985 */ 1986 if (dcp->dc_flags & DS_FIND_CHILDREN) { 1987 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1988 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1989 zap_cursor_retrieve(&zc, attr) == 0; 1990 (void) zap_cursor_advance(&zc)) { 1991 ASSERT3U(attr->za_integer_length, ==, 1992 sizeof (uint64_t)); 1993 ASSERT3U(attr->za_num_integers, ==, 1); 1994 1995 dmu_objset_find_ctx_t *child_dcp = 1996 kmem_alloc(sizeof (*child_dcp), KM_SLEEP); 1997 *child_dcp = *dcp; 1998 child_dcp->dc_ddobj = attr->za_first_integer; 1999 child_dcp->dc_ddname = spa_strdup(attr->za_name); 2000 if (dcp->dc_tq != NULL) 2001 (void) taskq_dispatch(dcp->dc_tq, 2002 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP); 2003 else 2004 dmu_objset_find_dp_impl(child_dcp); 2005 } 2006 zap_cursor_fini(&zc); 2007 } 2008 2009 /* 2010 * Iterate over all snapshots. 2011 */ 2012 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) { 2013 dsl_dataset_t *ds; 2014 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 2015 2016 if (err == 0) { 2017 uint64_t snapobj; 2018 2019 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 2020 dsl_dataset_rele(ds, FTAG); 2021 2022 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 2023 zap_cursor_retrieve(&zc, attr) == 0; 2024 (void) zap_cursor_advance(&zc)) { 2025 ASSERT3U(attr->za_integer_length, ==, 2026 sizeof (uint64_t)); 2027 ASSERT3U(attr->za_num_integers, ==, 1); 2028 2029 err = dsl_dataset_hold_obj(dp, 2030 attr->za_first_integer, FTAG, &ds); 2031 if (err != 0) 2032 break; 2033 err = dcp->dc_func(dp, ds, dcp->dc_arg); 2034 dsl_dataset_rele(ds, FTAG); 2035 if (err != 0) 2036 break; 2037 } 2038 zap_cursor_fini(&zc); 2039 } 2040 } 2041 2042 kmem_free(attr, sizeof (zap_attribute_t)); 2043 2044 if (err != 0) { 2045 dsl_dir_rele(dd, FTAG); 2046 goto out; 2047 } 2048 2049 /* 2050 * Apply to self. 2051 */ 2052 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 2053 2054 /* 2055 * Note: we hold the dir while calling dsl_dataset_hold_obj() so 2056 * that the dir will remain cached, and we won't have to re-instantiate 2057 * it (which could be expensive due to finding its name via 2058 * zap_value_search()). 2059 */ 2060 dsl_dir_rele(dd, FTAG); 2061 if (err != 0) 2062 goto out; 2063 err = dcp->dc_func(dp, ds, dcp->dc_arg); 2064 dsl_dataset_rele(ds, FTAG); 2065 2066 out: 2067 if (err != 0) { 2068 mutex_enter(dcp->dc_error_lock); 2069 /* only keep first error */ 2070 if (*dcp->dc_error == 0) 2071 *dcp->dc_error = err; 2072 mutex_exit(dcp->dc_error_lock); 2073 } 2074 2075 if (dcp->dc_ddname != NULL) 2076 spa_strfree(dcp->dc_ddname); 2077 kmem_free(dcp, sizeof (*dcp)); 2078 } 2079 2080 static void 2081 dmu_objset_find_dp_cb(void *arg) 2082 { 2083 dmu_objset_find_ctx_t *dcp = arg; 2084 dsl_pool_t *dp = dcp->dc_dp; 2085 2086 /* 2087 * We need to get a pool_config_lock here, as there are several 2088 * asssert(pool_config_held) down the stack. Getting a lock via 2089 * dsl_pool_config_enter is risky, as it might be stalled by a 2090 * pending writer. This would deadlock, as the write lock can 2091 * only be granted when our parent thread gives up the lock. 2092 * The _prio interface gives us priority over a pending writer. 2093 */ 2094 dsl_pool_config_enter_prio(dp, FTAG); 2095 2096 dmu_objset_find_dp_impl(dcp); 2097 2098 dsl_pool_config_exit(dp, FTAG); 2099 } 2100 2101 /* 2102 * Find objsets under and including ddobj, call func(ds) on each. 2103 * The order for the enumeration is completely undefined. 2104 * func is called with dsl_pool_config held. 2105 */ 2106 int 2107 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj, 2108 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags) 2109 { 2110 int error = 0; 2111 taskq_t *tq = NULL; 2112 int ntasks; 2113 dmu_objset_find_ctx_t *dcp; 2114 kmutex_t err_lock; 2115 2116 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL); 2117 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP); 2118 dcp->dc_tq = NULL; 2119 dcp->dc_dp = dp; 2120 dcp->dc_ddobj = ddobj; 2121 dcp->dc_ddname = NULL; 2122 dcp->dc_func = func; 2123 dcp->dc_arg = arg; 2124 dcp->dc_flags = flags; 2125 dcp->dc_error_lock = &err_lock; 2126 dcp->dc_error = &error; 2127 2128 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) { 2129 /* 2130 * In case a write lock is held we can't make use of 2131 * parallelism, as down the stack of the worker threads 2132 * the lock is asserted via dsl_pool_config_held. 2133 * In case of a read lock this is solved by getting a read 2134 * lock in each worker thread, which isn't possible in case 2135 * of a writer lock. So we fall back to the synchronous path 2136 * here. 2137 * In the future it might be possible to get some magic into 2138 * dsl_pool_config_held in a way that it returns true for 2139 * the worker threads so that a single lock held from this 2140 * thread suffices. For now, stay single threaded. 2141 */ 2142 dmu_objset_find_dp_impl(dcp); 2143 mutex_destroy(&err_lock); 2144 2145 return (error); 2146 } 2147 2148 ntasks = dmu_find_threads; 2149 if (ntasks == 0) 2150 ntasks = vdev_count_leaves(dp->dp_spa) * 4; 2151 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks, 2152 INT_MAX, 0); 2153 if (tq == NULL) { 2154 kmem_free(dcp, sizeof (*dcp)); 2155 mutex_destroy(&err_lock); 2156 2157 return (SET_ERROR(ENOMEM)); 2158 } 2159 dcp->dc_tq = tq; 2160 2161 /* dcp will be freed by task */ 2162 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP); 2163 2164 /* 2165 * PORTING: this code relies on the property of taskq_wait to wait 2166 * until no more tasks are queued and no more tasks are active. As 2167 * we always queue new tasks from within other tasks, task_wait 2168 * reliably waits for the full recursion to finish, even though we 2169 * enqueue new tasks after taskq_wait has been called. 2170 * On platforms other than illumos, taskq_wait may not have this 2171 * property. 2172 */ 2173 taskq_wait(tq); 2174 taskq_destroy(tq); 2175 mutex_destroy(&err_lock); 2176 2177 return (error); 2178 } 2179 2180 /* 2181 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 2182 * The dp_config_rwlock must not be held when this is called, and it 2183 * will not be held when the callback is called. 2184 * Therefore this function should only be used when the pool is not changing 2185 * (e.g. in syncing context), or the callback can deal with the possible races. 2186 */ 2187 static int 2188 dmu_objset_find_impl(spa_t *spa, const char *name, 2189 int func(const char *, void *), void *arg, int flags) 2190 { 2191 dsl_dir_t *dd; 2192 dsl_pool_t *dp = spa_get_dsl(spa); 2193 dsl_dataset_t *ds; 2194 zap_cursor_t zc; 2195 zap_attribute_t *attr; 2196 char *child; 2197 uint64_t thisobj; 2198 int err; 2199 2200 dsl_pool_config_enter(dp, FTAG); 2201 2202 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL); 2203 if (err != 0) { 2204 dsl_pool_config_exit(dp, FTAG); 2205 return (err); 2206 } 2207 2208 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 2209 if (dd->dd_myname[0] == '$') { 2210 dsl_dir_rele(dd, FTAG); 2211 dsl_pool_config_exit(dp, FTAG); 2212 return (0); 2213 } 2214 2215 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 2216 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 2217 2218 /* 2219 * Iterate over all children. 2220 */ 2221 if (flags & DS_FIND_CHILDREN) { 2222 for (zap_cursor_init(&zc, dp->dp_meta_objset, 2223 dsl_dir_phys(dd)->dd_child_dir_zapobj); 2224 zap_cursor_retrieve(&zc, attr) == 0; 2225 (void) zap_cursor_advance(&zc)) { 2226 ASSERT3U(attr->za_integer_length, ==, 2227 sizeof (uint64_t)); 2228 ASSERT3U(attr->za_num_integers, ==, 1); 2229 2230 child = kmem_asprintf("%s/%s", name, attr->za_name); 2231 dsl_pool_config_exit(dp, FTAG); 2232 err = dmu_objset_find_impl(spa, child, 2233 func, arg, flags); 2234 dsl_pool_config_enter(dp, FTAG); 2235 strfree(child); 2236 if (err != 0) 2237 break; 2238 } 2239 zap_cursor_fini(&zc); 2240 2241 if (err != 0) { 2242 dsl_dir_rele(dd, FTAG); 2243 dsl_pool_config_exit(dp, FTAG); 2244 kmem_free(attr, sizeof (zap_attribute_t)); 2245 return (err); 2246 } 2247 } 2248 2249 /* 2250 * Iterate over all snapshots. 2251 */ 2252 if (flags & DS_FIND_SNAPSHOTS) { 2253 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 2254 2255 if (err == 0) { 2256 uint64_t snapobj; 2257 2258 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 2259 dsl_dataset_rele(ds, FTAG); 2260 2261 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 2262 zap_cursor_retrieve(&zc, attr) == 0; 2263 (void) zap_cursor_advance(&zc)) { 2264 ASSERT3U(attr->za_integer_length, ==, 2265 sizeof (uint64_t)); 2266 ASSERT3U(attr->za_num_integers, ==, 1); 2267 2268 child = kmem_asprintf("%s@%s", 2269 name, attr->za_name); 2270 dsl_pool_config_exit(dp, FTAG); 2271 err = func(child, arg); 2272 dsl_pool_config_enter(dp, FTAG); 2273 strfree(child); 2274 if (err != 0) 2275 break; 2276 } 2277 zap_cursor_fini(&zc); 2278 } 2279 } 2280 2281 dsl_dir_rele(dd, FTAG); 2282 kmem_free(attr, sizeof (zap_attribute_t)); 2283 dsl_pool_config_exit(dp, FTAG); 2284 2285 if (err != 0) 2286 return (err); 2287 2288 /* Apply to self. */ 2289 return (func(name, arg)); 2290 } 2291 2292 /* 2293 * See comment above dmu_objset_find_impl(). 2294 */ 2295 int 2296 dmu_objset_find(char *name, int func(const char *, void *), void *arg, 2297 int flags) 2298 { 2299 spa_t *spa; 2300 int error; 2301 2302 error = spa_open(name, &spa, FTAG); 2303 if (error != 0) 2304 return (error); 2305 error = dmu_objset_find_impl(spa, name, func, arg, flags); 2306 spa_close(spa, FTAG); 2307 return (error); 2308 } 2309 2310 void 2311 dmu_objset_set_user(objset_t *os, void *user_ptr) 2312 { 2313 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 2314 os->os_user_ptr = user_ptr; 2315 } 2316 2317 void * 2318 dmu_objset_get_user(objset_t *os) 2319 { 2320 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 2321 return (os->os_user_ptr); 2322 } 2323 2324 /* 2325 * Determine name of filesystem, given name of snapshot. 2326 * buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes 2327 */ 2328 int 2329 dmu_fsname(const char *snapname, char *buf) 2330 { 2331 char *atp = strchr(snapname, '@'); 2332 if (atp == NULL) 2333 return (SET_ERROR(EINVAL)); 2334 if (atp - snapname >= ZFS_MAX_DATASET_NAME_LEN) 2335 return (SET_ERROR(ENAMETOOLONG)); 2336 (void) strlcpy(buf, snapname, atp - snapname + 1); 2337 return (0); 2338 } 2339 2340 /* 2341 * Call when we think we're going to write/free space in open context to track 2342 * the amount of dirty data in the open txg, which is also the amount 2343 * of memory that can not be evicted until this txg syncs. 2344 */ 2345 void 2346 dmu_objset_willuse_space(objset_t *os, int64_t space, dmu_tx_t *tx) 2347 { 2348 dsl_dataset_t *ds = os->os_dsl_dataset; 2349 int64_t aspace = spa_get_worst_case_asize(os->os_spa, space); 2350 2351 if (ds != NULL) { 2352 dsl_dir_willuse_space(ds->ds_dir, aspace, tx); 2353 dsl_pool_dirty_space(dmu_tx_pool(tx), space, tx); 2354 } 2355 } 2356