1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved. 24 * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. 25 * Copyright (c) 2013, Joyent, Inc. All rights reserved. 26 * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved. 27 * Copyright 2015 Nexenta Systems, Inc. All rights reserved. 28 * Copyright (c) 2015, STRATO AG, Inc. All rights reserved. 29 */ 30 31 /* Portions Copyright 2010 Robert Milkowski */ 32 33 #include <sys/cred.h> 34 #include <sys/zfs_context.h> 35 #include <sys/dmu_objset.h> 36 #include <sys/dsl_dir.h> 37 #include <sys/dsl_dataset.h> 38 #include <sys/dsl_prop.h> 39 #include <sys/dsl_pool.h> 40 #include <sys/dsl_synctask.h> 41 #include <sys/dsl_deleg.h> 42 #include <sys/dnode.h> 43 #include <sys/dbuf.h> 44 #include <sys/zvol.h> 45 #include <sys/dmu_tx.h> 46 #include <sys/zap.h> 47 #include <sys/zil.h> 48 #include <sys/dmu_impl.h> 49 #include <sys/zfs_ioctl.h> 50 #include <sys/sa.h> 51 #include <sys/zfs_onexit.h> 52 #include <sys/dsl_destroy.h> 53 #include <sys/vdev.h> 54 55 /* 56 * Needed to close a window in dnode_move() that allows the objset to be freed 57 * before it can be safely accessed. 58 */ 59 krwlock_t os_lock; 60 61 /* 62 * Tunable to overwrite the maximum number of threads for the parallization 63 * of dmu_objset_find_dp, needed to speed up the import of pools with many 64 * datasets. 65 * Default is 4 times the number of leaf vdevs. 66 */ 67 int dmu_find_threads = 0; 68 69 static void dmu_objset_find_dp_cb(void *arg); 70 71 void 72 dmu_objset_init(void) 73 { 74 rw_init(&os_lock, NULL, RW_DEFAULT, NULL); 75 } 76 77 void 78 dmu_objset_fini(void) 79 { 80 rw_destroy(&os_lock); 81 } 82 83 spa_t * 84 dmu_objset_spa(objset_t *os) 85 { 86 return (os->os_spa); 87 } 88 89 zilog_t * 90 dmu_objset_zil(objset_t *os) 91 { 92 return (os->os_zil); 93 } 94 95 dsl_pool_t * 96 dmu_objset_pool(objset_t *os) 97 { 98 dsl_dataset_t *ds; 99 100 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir) 101 return (ds->ds_dir->dd_pool); 102 else 103 return (spa_get_dsl(os->os_spa)); 104 } 105 106 dsl_dataset_t * 107 dmu_objset_ds(objset_t *os) 108 { 109 return (os->os_dsl_dataset); 110 } 111 112 dmu_objset_type_t 113 dmu_objset_type(objset_t *os) 114 { 115 return (os->os_phys->os_type); 116 } 117 118 void 119 dmu_objset_name(objset_t *os, char *buf) 120 { 121 dsl_dataset_name(os->os_dsl_dataset, buf); 122 } 123 124 uint64_t 125 dmu_objset_id(objset_t *os) 126 { 127 dsl_dataset_t *ds = os->os_dsl_dataset; 128 129 return (ds ? ds->ds_object : 0); 130 } 131 132 zfs_sync_type_t 133 dmu_objset_syncprop(objset_t *os) 134 { 135 return (os->os_sync); 136 } 137 138 zfs_logbias_op_t 139 dmu_objset_logbias(objset_t *os) 140 { 141 return (os->os_logbias); 142 } 143 144 static void 145 checksum_changed_cb(void *arg, uint64_t newval) 146 { 147 objset_t *os = arg; 148 149 /* 150 * Inheritance should have been done by now. 151 */ 152 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 153 154 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 155 } 156 157 static void 158 compression_changed_cb(void *arg, uint64_t newval) 159 { 160 objset_t *os = arg; 161 162 /* 163 * Inheritance and range checking should have been done by now. 164 */ 165 ASSERT(newval != ZIO_COMPRESS_INHERIT); 166 167 os->os_compress = zio_compress_select(os->os_spa, newval, 168 ZIO_COMPRESS_ON); 169 } 170 171 static void 172 copies_changed_cb(void *arg, uint64_t newval) 173 { 174 objset_t *os = arg; 175 176 /* 177 * Inheritance and range checking should have been done by now. 178 */ 179 ASSERT(newval > 0); 180 ASSERT(newval <= spa_max_replication(os->os_spa)); 181 182 os->os_copies = newval; 183 } 184 185 static void 186 dedup_changed_cb(void *arg, uint64_t newval) 187 { 188 objset_t *os = arg; 189 spa_t *spa = os->os_spa; 190 enum zio_checksum checksum; 191 192 /* 193 * Inheritance should have been done by now. 194 */ 195 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 196 197 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF); 198 199 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK; 200 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY); 201 } 202 203 static void 204 primary_cache_changed_cb(void *arg, uint64_t newval) 205 { 206 objset_t *os = arg; 207 208 /* 209 * Inheritance and range checking should have been done by now. 210 */ 211 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 212 newval == ZFS_CACHE_METADATA); 213 214 os->os_primary_cache = newval; 215 } 216 217 static void 218 secondary_cache_changed_cb(void *arg, uint64_t newval) 219 { 220 objset_t *os = arg; 221 222 /* 223 * Inheritance and range checking should have been done by now. 224 */ 225 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 226 newval == ZFS_CACHE_METADATA); 227 228 os->os_secondary_cache = newval; 229 } 230 231 static void 232 sync_changed_cb(void *arg, uint64_t newval) 233 { 234 objset_t *os = arg; 235 236 /* 237 * Inheritance and range checking should have been done by now. 238 */ 239 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS || 240 newval == ZFS_SYNC_DISABLED); 241 242 os->os_sync = newval; 243 if (os->os_zil) 244 zil_set_sync(os->os_zil, newval); 245 } 246 247 static void 248 redundant_metadata_changed_cb(void *arg, uint64_t newval) 249 { 250 objset_t *os = arg; 251 252 /* 253 * Inheritance and range checking should have been done by now. 254 */ 255 ASSERT(newval == ZFS_REDUNDANT_METADATA_ALL || 256 newval == ZFS_REDUNDANT_METADATA_MOST); 257 258 os->os_redundant_metadata = newval; 259 } 260 261 static void 262 logbias_changed_cb(void *arg, uint64_t newval) 263 { 264 objset_t *os = arg; 265 266 ASSERT(newval == ZFS_LOGBIAS_LATENCY || 267 newval == ZFS_LOGBIAS_THROUGHPUT); 268 os->os_logbias = newval; 269 if (os->os_zil) 270 zil_set_logbias(os->os_zil, newval); 271 } 272 273 static void 274 recordsize_changed_cb(void *arg, uint64_t newval) 275 { 276 objset_t *os = arg; 277 278 os->os_recordsize = newval; 279 } 280 281 void 282 dmu_objset_byteswap(void *buf, size_t size) 283 { 284 objset_phys_t *osp = buf; 285 286 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t)); 287 dnode_byteswap(&osp->os_meta_dnode); 288 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 289 osp->os_type = BSWAP_64(osp->os_type); 290 osp->os_flags = BSWAP_64(osp->os_flags); 291 if (size == sizeof (objset_phys_t)) { 292 dnode_byteswap(&osp->os_userused_dnode); 293 dnode_byteswap(&osp->os_groupused_dnode); 294 } 295 } 296 297 int 298 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 299 objset_t **osp) 300 { 301 objset_t *os; 302 int i, err; 303 304 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 305 306 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP); 307 os->os_dsl_dataset = ds; 308 os->os_spa = spa; 309 os->os_rootbp = bp; 310 if (!BP_IS_HOLE(os->os_rootbp)) { 311 arc_flags_t aflags = ARC_FLAG_WAIT; 312 zbookmark_phys_t zb; 313 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 314 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 315 316 if (DMU_OS_IS_L2CACHEABLE(os)) 317 aflags |= ARC_FLAG_L2CACHE; 318 if (DMU_OS_IS_L2COMPRESSIBLE(os)) 319 aflags |= ARC_FLAG_L2COMPRESS; 320 321 dprintf_bp(os->os_rootbp, "reading %s", ""); 322 err = arc_read(NULL, spa, os->os_rootbp, 323 arc_getbuf_func, &os->os_phys_buf, 324 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 325 if (err != 0) { 326 kmem_free(os, sizeof (objset_t)); 327 /* convert checksum errors into IO errors */ 328 if (err == ECKSUM) 329 err = SET_ERROR(EIO); 330 return (err); 331 } 332 333 /* Increase the blocksize if we are permitted. */ 334 if (spa_version(spa) >= SPA_VERSION_USERSPACE && 335 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) { 336 arc_buf_t *buf = arc_buf_alloc(spa, 337 sizeof (objset_phys_t), &os->os_phys_buf, 338 ARC_BUFC_METADATA); 339 bzero(buf->b_data, sizeof (objset_phys_t)); 340 bcopy(os->os_phys_buf->b_data, buf->b_data, 341 arc_buf_size(os->os_phys_buf)); 342 (void) arc_buf_remove_ref(os->os_phys_buf, 343 &os->os_phys_buf); 344 os->os_phys_buf = buf; 345 } 346 347 os->os_phys = os->os_phys_buf->b_data; 348 os->os_flags = os->os_phys->os_flags; 349 } else { 350 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? 351 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; 352 os->os_phys_buf = arc_buf_alloc(spa, size, 353 &os->os_phys_buf, ARC_BUFC_METADATA); 354 os->os_phys = os->os_phys_buf->b_data; 355 bzero(os->os_phys, size); 356 } 357 358 /* 359 * Note: the changed_cb will be called once before the register 360 * func returns, thus changing the checksum/compression from the 361 * default (fletcher2/off). Snapshots don't need to know about 362 * checksum/compression/copies. 363 */ 364 if (ds != NULL) { 365 err = dsl_prop_register(ds, 366 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE), 367 primary_cache_changed_cb, os); 368 if (err == 0) { 369 err = dsl_prop_register(ds, 370 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE), 371 secondary_cache_changed_cb, os); 372 } 373 if (!ds->ds_is_snapshot) { 374 if (err == 0) { 375 err = dsl_prop_register(ds, 376 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 377 checksum_changed_cb, os); 378 } 379 if (err == 0) { 380 err = dsl_prop_register(ds, 381 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 382 compression_changed_cb, os); 383 } 384 if (err == 0) { 385 err = dsl_prop_register(ds, 386 zfs_prop_to_name(ZFS_PROP_COPIES), 387 copies_changed_cb, os); 388 } 389 if (err == 0) { 390 err = dsl_prop_register(ds, 391 zfs_prop_to_name(ZFS_PROP_DEDUP), 392 dedup_changed_cb, os); 393 } 394 if (err == 0) { 395 err = dsl_prop_register(ds, 396 zfs_prop_to_name(ZFS_PROP_LOGBIAS), 397 logbias_changed_cb, os); 398 } 399 if (err == 0) { 400 err = dsl_prop_register(ds, 401 zfs_prop_to_name(ZFS_PROP_SYNC), 402 sync_changed_cb, os); 403 } 404 if (err == 0) { 405 err = dsl_prop_register(ds, 406 zfs_prop_to_name( 407 ZFS_PROP_REDUNDANT_METADATA), 408 redundant_metadata_changed_cb, os); 409 } 410 if (err == 0) { 411 err = dsl_prop_register(ds, 412 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 413 recordsize_changed_cb, os); 414 } 415 } 416 if (err != 0) { 417 VERIFY(arc_buf_remove_ref(os->os_phys_buf, 418 &os->os_phys_buf)); 419 kmem_free(os, sizeof (objset_t)); 420 return (err); 421 } 422 } else { 423 /* It's the meta-objset. */ 424 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 425 os->os_compress = ZIO_COMPRESS_ON; 426 os->os_copies = spa_max_replication(spa); 427 os->os_dedup_checksum = ZIO_CHECKSUM_OFF; 428 os->os_dedup_verify = B_FALSE; 429 os->os_logbias = ZFS_LOGBIAS_LATENCY; 430 os->os_sync = ZFS_SYNC_STANDARD; 431 os->os_primary_cache = ZFS_CACHE_ALL; 432 os->os_secondary_cache = ZFS_CACHE_ALL; 433 } 434 435 if (ds == NULL || !ds->ds_is_snapshot) 436 os->os_zil_header = os->os_phys->os_zil_header; 437 os->os_zil = zil_alloc(os, &os->os_zil_header); 438 439 for (i = 0; i < TXG_SIZE; i++) { 440 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t), 441 offsetof(dnode_t, dn_dirty_link[i])); 442 list_create(&os->os_free_dnodes[i], sizeof (dnode_t), 443 offsetof(dnode_t, dn_dirty_link[i])); 444 } 445 list_create(&os->os_dnodes, sizeof (dnode_t), 446 offsetof(dnode_t, dn_link)); 447 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 448 offsetof(dmu_buf_impl_t, db_link)); 449 450 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); 451 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 452 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 453 454 dnode_special_open(os, &os->os_phys->os_meta_dnode, 455 DMU_META_DNODE_OBJECT, &os->os_meta_dnode); 456 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) { 457 dnode_special_open(os, &os->os_phys->os_userused_dnode, 458 DMU_USERUSED_OBJECT, &os->os_userused_dnode); 459 dnode_special_open(os, &os->os_phys->os_groupused_dnode, 460 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode); 461 } 462 463 *osp = os; 464 return (0); 465 } 466 467 int 468 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) 469 { 470 int err = 0; 471 472 mutex_enter(&ds->ds_opening_lock); 473 if (ds->ds_objset == NULL) { 474 objset_t *os; 475 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 476 ds, dsl_dataset_get_blkptr(ds), &os); 477 478 if (err == 0) { 479 mutex_enter(&ds->ds_lock); 480 ASSERT(ds->ds_objset == NULL); 481 ds->ds_objset = os; 482 mutex_exit(&ds->ds_lock); 483 } 484 } 485 *osp = ds->ds_objset; 486 mutex_exit(&ds->ds_opening_lock); 487 return (err); 488 } 489 490 /* 491 * Holds the pool while the objset is held. Therefore only one objset 492 * can be held at a time. 493 */ 494 int 495 dmu_objset_hold(const char *name, void *tag, objset_t **osp) 496 { 497 dsl_pool_t *dp; 498 dsl_dataset_t *ds; 499 int err; 500 501 err = dsl_pool_hold(name, tag, &dp); 502 if (err != 0) 503 return (err); 504 err = dsl_dataset_hold(dp, name, tag, &ds); 505 if (err != 0) { 506 dsl_pool_rele(dp, tag); 507 return (err); 508 } 509 510 err = dmu_objset_from_ds(ds, osp); 511 if (err != 0) { 512 dsl_dataset_rele(ds, tag); 513 dsl_pool_rele(dp, tag); 514 } 515 516 return (err); 517 } 518 519 static int 520 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type, 521 boolean_t readonly, void *tag, objset_t **osp) 522 { 523 int err; 524 525 err = dmu_objset_from_ds(ds, osp); 526 if (err != 0) { 527 dsl_dataset_disown(ds, tag); 528 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) { 529 dsl_dataset_disown(ds, tag); 530 return (SET_ERROR(EINVAL)); 531 } else if (!readonly && dsl_dataset_is_snapshot(ds)) { 532 dsl_dataset_disown(ds, tag); 533 return (SET_ERROR(EROFS)); 534 } 535 return (err); 536 } 537 538 /* 539 * dsl_pool must not be held when this is called. 540 * Upon successful return, there will be a longhold on the dataset, 541 * and the dsl_pool will not be held. 542 */ 543 int 544 dmu_objset_own(const char *name, dmu_objset_type_t type, 545 boolean_t readonly, void *tag, objset_t **osp) 546 { 547 dsl_pool_t *dp; 548 dsl_dataset_t *ds; 549 int err; 550 551 err = dsl_pool_hold(name, FTAG, &dp); 552 if (err != 0) 553 return (err); 554 err = dsl_dataset_own(dp, name, tag, &ds); 555 if (err != 0) { 556 dsl_pool_rele(dp, FTAG); 557 return (err); 558 } 559 err = dmu_objset_own_impl(ds, type, readonly, tag, osp); 560 dsl_pool_rele(dp, FTAG); 561 562 return (err); 563 } 564 565 int 566 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type, 567 boolean_t readonly, void *tag, objset_t **osp) 568 { 569 dsl_dataset_t *ds; 570 int err; 571 572 err = dsl_dataset_own_obj(dp, obj, tag, &ds); 573 if (err != 0) 574 return (err); 575 576 return (dmu_objset_own_impl(ds, type, readonly, tag, osp)); 577 } 578 579 void 580 dmu_objset_rele(objset_t *os, void *tag) 581 { 582 dsl_pool_t *dp = dmu_objset_pool(os); 583 dsl_dataset_rele(os->os_dsl_dataset, tag); 584 dsl_pool_rele(dp, tag); 585 } 586 587 /* 588 * When we are called, os MUST refer to an objset associated with a dataset 589 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner 590 * == tag. We will then release and reacquire ownership of the dataset while 591 * holding the pool config_rwlock to avoid intervening namespace or ownership 592 * changes may occur. 593 * 594 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to 595 * release the hold on its dataset and acquire a new one on the dataset of the 596 * same name so that it can be partially torn down and reconstructed. 597 */ 598 void 599 dmu_objset_refresh_ownership(objset_t *os, void *tag) 600 { 601 dsl_pool_t *dp; 602 dsl_dataset_t *ds, *newds; 603 char name[MAXNAMELEN]; 604 605 ds = os->os_dsl_dataset; 606 VERIFY3P(ds, !=, NULL); 607 VERIFY3P(ds->ds_owner, ==, tag); 608 VERIFY(dsl_dataset_long_held(ds)); 609 610 dsl_dataset_name(ds, name); 611 dp = dmu_objset_pool(os); 612 dsl_pool_config_enter(dp, FTAG); 613 dmu_objset_disown(os, tag); 614 VERIFY0(dsl_dataset_own(dp, name, tag, &newds)); 615 VERIFY3P(newds, ==, os->os_dsl_dataset); 616 dsl_pool_config_exit(dp, FTAG); 617 } 618 619 void 620 dmu_objset_disown(objset_t *os, void *tag) 621 { 622 dsl_dataset_disown(os->os_dsl_dataset, tag); 623 } 624 625 void 626 dmu_objset_evict_dbufs(objset_t *os) 627 { 628 dnode_t dn_marker; 629 dnode_t *dn; 630 631 mutex_enter(&os->os_lock); 632 dn = list_head(&os->os_dnodes); 633 while (dn != NULL) { 634 /* 635 * Skip dnodes without holds. We have to do this dance 636 * because dnode_add_ref() only works if there is already a 637 * hold. If the dnode has no holds, then it has no dbufs. 638 */ 639 if (dnode_add_ref(dn, FTAG)) { 640 list_insert_after(&os->os_dnodes, dn, &dn_marker); 641 mutex_exit(&os->os_lock); 642 643 dnode_evict_dbufs(dn); 644 dnode_rele(dn, FTAG); 645 646 mutex_enter(&os->os_lock); 647 dn = list_next(&os->os_dnodes, &dn_marker); 648 list_remove(&os->os_dnodes, &dn_marker); 649 } else { 650 dn = list_next(&os->os_dnodes, dn); 651 } 652 } 653 mutex_exit(&os->os_lock); 654 655 if (DMU_USERUSED_DNODE(os) != NULL) { 656 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os)); 657 dnode_evict_dbufs(DMU_USERUSED_DNODE(os)); 658 } 659 dnode_evict_dbufs(DMU_META_DNODE(os)); 660 } 661 662 /* 663 * Objset eviction processing is split into into two pieces. 664 * The first marks the objset as evicting, evicts any dbufs that 665 * have a refcount of zero, and then queues up the objset for the 666 * second phase of eviction. Once os->os_dnodes has been cleared by 667 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed. 668 * The second phase closes the special dnodes, dequeues the objset from 669 * the list of those undergoing eviction, and finally frees the objset. 670 * 671 * NOTE: Due to asynchronous eviction processing (invocation of 672 * dnode_buf_pageout()), it is possible for the meta dnode for the 673 * objset to have no holds even though os->os_dnodes is not empty. 674 */ 675 void 676 dmu_objset_evict(objset_t *os) 677 { 678 dsl_dataset_t *ds = os->os_dsl_dataset; 679 680 for (int t = 0; t < TXG_SIZE; t++) 681 ASSERT(!dmu_objset_is_dirty(os, t)); 682 683 if (ds) { 684 if (!ds->ds_is_snapshot) { 685 VERIFY0(dsl_prop_unregister(ds, 686 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 687 checksum_changed_cb, os)); 688 VERIFY0(dsl_prop_unregister(ds, 689 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 690 compression_changed_cb, os)); 691 VERIFY0(dsl_prop_unregister(ds, 692 zfs_prop_to_name(ZFS_PROP_COPIES), 693 copies_changed_cb, os)); 694 VERIFY0(dsl_prop_unregister(ds, 695 zfs_prop_to_name(ZFS_PROP_DEDUP), 696 dedup_changed_cb, os)); 697 VERIFY0(dsl_prop_unregister(ds, 698 zfs_prop_to_name(ZFS_PROP_LOGBIAS), 699 logbias_changed_cb, os)); 700 VERIFY0(dsl_prop_unregister(ds, 701 zfs_prop_to_name(ZFS_PROP_SYNC), 702 sync_changed_cb, os)); 703 VERIFY0(dsl_prop_unregister(ds, 704 zfs_prop_to_name(ZFS_PROP_REDUNDANT_METADATA), 705 redundant_metadata_changed_cb, os)); 706 VERIFY0(dsl_prop_unregister(ds, 707 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 708 recordsize_changed_cb, os)); 709 } 710 VERIFY0(dsl_prop_unregister(ds, 711 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE), 712 primary_cache_changed_cb, os)); 713 VERIFY0(dsl_prop_unregister(ds, 714 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE), 715 secondary_cache_changed_cb, os)); 716 } 717 718 if (os->os_sa) 719 sa_tear_down(os); 720 721 os->os_evicting = B_TRUE; 722 dmu_objset_evict_dbufs(os); 723 724 mutex_enter(&os->os_lock); 725 spa_evicting_os_register(os->os_spa, os); 726 if (list_is_empty(&os->os_dnodes)) { 727 mutex_exit(&os->os_lock); 728 dmu_objset_evict_done(os); 729 } else { 730 mutex_exit(&os->os_lock); 731 } 732 } 733 734 void 735 dmu_objset_evict_done(objset_t *os) 736 { 737 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 738 739 dnode_special_close(&os->os_meta_dnode); 740 if (DMU_USERUSED_DNODE(os)) { 741 dnode_special_close(&os->os_userused_dnode); 742 dnode_special_close(&os->os_groupused_dnode); 743 } 744 zil_free(os->os_zil); 745 746 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf)); 747 748 /* 749 * This is a barrier to prevent the objset from going away in 750 * dnode_move() until we can safely ensure that the objset is still in 751 * use. We consider the objset valid before the barrier and invalid 752 * after the barrier. 753 */ 754 rw_enter(&os_lock, RW_READER); 755 rw_exit(&os_lock); 756 757 mutex_destroy(&os->os_lock); 758 mutex_destroy(&os->os_obj_lock); 759 mutex_destroy(&os->os_user_ptr_lock); 760 spa_evicting_os_deregister(os->os_spa, os); 761 kmem_free(os, sizeof (objset_t)); 762 } 763 764 timestruc_t 765 dmu_objset_snap_cmtime(objset_t *os) 766 { 767 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); 768 } 769 770 /* called from dsl for meta-objset */ 771 objset_t * 772 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 773 dmu_objset_type_t type, dmu_tx_t *tx) 774 { 775 objset_t *os; 776 dnode_t *mdn; 777 778 ASSERT(dmu_tx_is_syncing(tx)); 779 780 if (ds != NULL) 781 VERIFY0(dmu_objset_from_ds(ds, &os)); 782 else 783 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os)); 784 785 mdn = DMU_META_DNODE(os); 786 787 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 788 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 789 790 /* 791 * We don't want to have to increase the meta-dnode's nlevels 792 * later, because then we could do it in quescing context while 793 * we are also accessing it in open context. 794 * 795 * This precaution is not necessary for the MOS (ds == NULL), 796 * because the MOS is only updated in syncing context. 797 * This is most fortunate: the MOS is the only objset that 798 * needs to be synced multiple times as spa_sync() iterates 799 * to convergence, so minimizing its dn_nlevels matters. 800 */ 801 if (ds != NULL) { 802 int levels = 1; 803 804 /* 805 * Determine the number of levels necessary for the meta-dnode 806 * to contain DN_MAX_OBJECT dnodes. 807 */ 808 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 809 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 810 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 811 levels++; 812 813 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 814 mdn->dn_nlevels = levels; 815 } 816 817 ASSERT(type != DMU_OST_NONE); 818 ASSERT(type != DMU_OST_ANY); 819 ASSERT(type < DMU_OST_NUMTYPES); 820 os->os_phys->os_type = type; 821 if (dmu_objset_userused_enabled(os)) { 822 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 823 os->os_flags = os->os_phys->os_flags; 824 } 825 826 dsl_dataset_dirty(ds, tx); 827 828 return (os); 829 } 830 831 typedef struct dmu_objset_create_arg { 832 const char *doca_name; 833 cred_t *doca_cred; 834 void (*doca_userfunc)(objset_t *os, void *arg, 835 cred_t *cr, dmu_tx_t *tx); 836 void *doca_userarg; 837 dmu_objset_type_t doca_type; 838 uint64_t doca_flags; 839 } dmu_objset_create_arg_t; 840 841 /*ARGSUSED*/ 842 static int 843 dmu_objset_create_check(void *arg, dmu_tx_t *tx) 844 { 845 dmu_objset_create_arg_t *doca = arg; 846 dsl_pool_t *dp = dmu_tx_pool(tx); 847 dsl_dir_t *pdd; 848 const char *tail; 849 int error; 850 851 if (strchr(doca->doca_name, '@') != NULL) 852 return (SET_ERROR(EINVAL)); 853 854 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail); 855 if (error != 0) 856 return (error); 857 if (tail == NULL) { 858 dsl_dir_rele(pdd, FTAG); 859 return (SET_ERROR(EEXIST)); 860 } 861 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 862 doca->doca_cred); 863 dsl_dir_rele(pdd, FTAG); 864 865 return (error); 866 } 867 868 static void 869 dmu_objset_create_sync(void *arg, dmu_tx_t *tx) 870 { 871 dmu_objset_create_arg_t *doca = arg; 872 dsl_pool_t *dp = dmu_tx_pool(tx); 873 dsl_dir_t *pdd; 874 const char *tail; 875 dsl_dataset_t *ds; 876 uint64_t obj; 877 blkptr_t *bp; 878 objset_t *os; 879 880 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail)); 881 882 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags, 883 doca->doca_cred, tx); 884 885 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 886 bp = dsl_dataset_get_blkptr(ds); 887 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa, 888 ds, bp, doca->doca_type, tx); 889 890 if (doca->doca_userfunc != NULL) { 891 doca->doca_userfunc(os, doca->doca_userarg, 892 doca->doca_cred, tx); 893 } 894 895 spa_history_log_internal_ds(ds, "create", tx, ""); 896 dsl_dataset_rele(ds, FTAG); 897 dsl_dir_rele(pdd, FTAG); 898 } 899 900 int 901 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 902 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 903 { 904 dmu_objset_create_arg_t doca; 905 906 doca.doca_name = name; 907 doca.doca_cred = CRED(); 908 doca.doca_flags = flags; 909 doca.doca_userfunc = func; 910 doca.doca_userarg = arg; 911 doca.doca_type = type; 912 913 return (dsl_sync_task(name, 914 dmu_objset_create_check, dmu_objset_create_sync, &doca, 915 5, ZFS_SPACE_CHECK_NORMAL)); 916 } 917 918 typedef struct dmu_objset_clone_arg { 919 const char *doca_clone; 920 const char *doca_origin; 921 cred_t *doca_cred; 922 } dmu_objset_clone_arg_t; 923 924 /*ARGSUSED*/ 925 static int 926 dmu_objset_clone_check(void *arg, dmu_tx_t *tx) 927 { 928 dmu_objset_clone_arg_t *doca = arg; 929 dsl_dir_t *pdd; 930 const char *tail; 931 int error; 932 dsl_dataset_t *origin; 933 dsl_pool_t *dp = dmu_tx_pool(tx); 934 935 if (strchr(doca->doca_clone, '@') != NULL) 936 return (SET_ERROR(EINVAL)); 937 938 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail); 939 if (error != 0) 940 return (error); 941 if (tail == NULL) { 942 dsl_dir_rele(pdd, FTAG); 943 return (SET_ERROR(EEXIST)); 944 } 945 946 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 947 doca->doca_cred); 948 if (error != 0) { 949 dsl_dir_rele(pdd, FTAG); 950 return (SET_ERROR(EDQUOT)); 951 } 952 dsl_dir_rele(pdd, FTAG); 953 954 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin); 955 if (error != 0) 956 return (error); 957 958 /* You can only clone snapshots, not the head datasets. */ 959 if (!origin->ds_is_snapshot) { 960 dsl_dataset_rele(origin, FTAG); 961 return (SET_ERROR(EINVAL)); 962 } 963 dsl_dataset_rele(origin, FTAG); 964 965 return (0); 966 } 967 968 static void 969 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx) 970 { 971 dmu_objset_clone_arg_t *doca = arg; 972 dsl_pool_t *dp = dmu_tx_pool(tx); 973 dsl_dir_t *pdd; 974 const char *tail; 975 dsl_dataset_t *origin, *ds; 976 uint64_t obj; 977 char namebuf[MAXNAMELEN]; 978 979 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail)); 980 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin)); 981 982 obj = dsl_dataset_create_sync(pdd, tail, origin, 0, 983 doca->doca_cred, tx); 984 985 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 986 dsl_dataset_name(origin, namebuf); 987 spa_history_log_internal_ds(ds, "clone", tx, 988 "origin=%s (%llu)", namebuf, origin->ds_object); 989 dsl_dataset_rele(ds, FTAG); 990 dsl_dataset_rele(origin, FTAG); 991 dsl_dir_rele(pdd, FTAG); 992 } 993 994 int 995 dmu_objset_clone(const char *clone, const char *origin) 996 { 997 dmu_objset_clone_arg_t doca; 998 999 doca.doca_clone = clone; 1000 doca.doca_origin = origin; 1001 doca.doca_cred = CRED(); 1002 1003 return (dsl_sync_task(clone, 1004 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 1005 5, ZFS_SPACE_CHECK_NORMAL)); 1006 } 1007 1008 int 1009 dmu_objset_snapshot_one(const char *fsname, const char *snapname) 1010 { 1011 int err; 1012 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname); 1013 nvlist_t *snaps = fnvlist_alloc(); 1014 1015 fnvlist_add_boolean(snaps, longsnap); 1016 strfree(longsnap); 1017 err = dsl_dataset_snapshot(snaps, NULL, NULL); 1018 fnvlist_free(snaps); 1019 return (err); 1020 } 1021 1022 static void 1023 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) 1024 { 1025 dnode_t *dn; 1026 1027 while (dn = list_head(list)) { 1028 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 1029 ASSERT(dn->dn_dbuf->db_data_pending); 1030 /* 1031 * Initialize dn_zio outside dnode_sync() because the 1032 * meta-dnode needs to set it ouside dnode_sync(). 1033 */ 1034 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 1035 ASSERT(dn->dn_zio); 1036 1037 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 1038 list_remove(list, dn); 1039 1040 if (newlist) { 1041 (void) dnode_add_ref(dn, newlist); 1042 list_insert_tail(newlist, dn); 1043 } 1044 1045 dnode_sync(dn, tx); 1046 } 1047 } 1048 1049 /* ARGSUSED */ 1050 static void 1051 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) 1052 { 1053 blkptr_t *bp = zio->io_bp; 1054 objset_t *os = arg; 1055 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 1056 1057 ASSERT(!BP_IS_EMBEDDED(bp)); 1058 ASSERT3P(bp, ==, os->os_rootbp); 1059 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET); 1060 ASSERT0(BP_GET_LEVEL(bp)); 1061 1062 /* 1063 * Update rootbp fill count: it should be the number of objects 1064 * allocated in the object set (not counting the "special" 1065 * objects that are stored in the objset_phys_t -- the meta 1066 * dnode and user/group accounting objects). 1067 */ 1068 bp->blk_fill = 0; 1069 for (int i = 0; i < dnp->dn_nblkptr; i++) 1070 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]); 1071 } 1072 1073 /* ARGSUSED */ 1074 static void 1075 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) 1076 { 1077 blkptr_t *bp = zio->io_bp; 1078 blkptr_t *bp_orig = &zio->io_bp_orig; 1079 objset_t *os = arg; 1080 1081 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 1082 ASSERT(BP_EQUAL(bp, bp_orig)); 1083 } else { 1084 dsl_dataset_t *ds = os->os_dsl_dataset; 1085 dmu_tx_t *tx = os->os_synctx; 1086 1087 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 1088 dsl_dataset_block_born(ds, bp, tx); 1089 } 1090 } 1091 1092 /* called from dsl */ 1093 void 1094 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 1095 { 1096 int txgoff; 1097 zbookmark_phys_t zb; 1098 zio_prop_t zp; 1099 zio_t *zio; 1100 list_t *list; 1101 list_t *newlist = NULL; 1102 dbuf_dirty_record_t *dr; 1103 1104 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 1105 1106 ASSERT(dmu_tx_is_syncing(tx)); 1107 /* XXX the write_done callback should really give us the tx... */ 1108 os->os_synctx = tx; 1109 1110 if (os->os_dsl_dataset == NULL) { 1111 /* 1112 * This is the MOS. If we have upgraded, 1113 * spa_max_replication() could change, so reset 1114 * os_copies here. 1115 */ 1116 os->os_copies = spa_max_replication(os->os_spa); 1117 } 1118 1119 /* 1120 * Create the root block IO 1121 */ 1122 SET_BOOKMARK(&zb, os->os_dsl_dataset ? 1123 os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1124 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 1125 arc_release(os->os_phys_buf, &os->os_phys_buf); 1126 1127 dmu_write_policy(os, NULL, 0, 0, &zp); 1128 1129 zio = arc_write(pio, os->os_spa, tx->tx_txg, 1130 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), 1131 DMU_OS_IS_L2COMPRESSIBLE(os), &zp, dmu_objset_write_ready, 1132 NULL, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE, 1133 ZIO_FLAG_MUSTSUCCEED, &zb); 1134 1135 /* 1136 * Sync special dnodes - the parent IO for the sync is the root block 1137 */ 1138 DMU_META_DNODE(os)->dn_zio = zio; 1139 dnode_sync(DMU_META_DNODE(os), tx); 1140 1141 os->os_phys->os_flags = os->os_flags; 1142 1143 if (DMU_USERUSED_DNODE(os) && 1144 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { 1145 DMU_USERUSED_DNODE(os)->dn_zio = zio; 1146 dnode_sync(DMU_USERUSED_DNODE(os), tx); 1147 DMU_GROUPUSED_DNODE(os)->dn_zio = zio; 1148 dnode_sync(DMU_GROUPUSED_DNODE(os), tx); 1149 } 1150 1151 txgoff = tx->tx_txg & TXG_MASK; 1152 1153 if (dmu_objset_userused_enabled(os)) { 1154 newlist = &os->os_synced_dnodes; 1155 /* 1156 * We must create the list here because it uses the 1157 * dn_dirty_link[] of this txg. 1158 */ 1159 list_create(newlist, sizeof (dnode_t), 1160 offsetof(dnode_t, dn_dirty_link[txgoff])); 1161 } 1162 1163 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); 1164 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); 1165 1166 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; 1167 while (dr = list_head(list)) { 1168 ASSERT0(dr->dr_dbuf->db_level); 1169 list_remove(list, dr); 1170 if (dr->dr_zio) 1171 zio_nowait(dr->dr_zio); 1172 } 1173 /* 1174 * Free intent log blocks up to this tx. 1175 */ 1176 zil_sync(os->os_zil, tx); 1177 os->os_phys->os_zil_header = os->os_zil_header; 1178 zio_nowait(zio); 1179 } 1180 1181 boolean_t 1182 dmu_objset_is_dirty(objset_t *os, uint64_t txg) 1183 { 1184 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) || 1185 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK])); 1186 } 1187 1188 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1189 1190 void 1191 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1192 { 1193 used_cbs[ost] = cb; 1194 } 1195 1196 boolean_t 1197 dmu_objset_userused_enabled(objset_t *os) 1198 { 1199 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1200 used_cbs[os->os_phys->os_type] != NULL && 1201 DMU_USERUSED_DNODE(os) != NULL); 1202 } 1203 1204 static void 1205 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags, 1206 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx) 1207 { 1208 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { 1209 int64_t delta = DNODE_SIZE + used; 1210 if (subtract) 1211 delta = -delta; 1212 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT, 1213 user, delta, tx)); 1214 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT, 1215 group, delta, tx)); 1216 } 1217 } 1218 1219 void 1220 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) 1221 { 1222 dnode_t *dn; 1223 list_t *list = &os->os_synced_dnodes; 1224 1225 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); 1226 1227 while (dn = list_head(list)) { 1228 int flags; 1229 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1230 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1231 dn->dn_phys->dn_flags & 1232 DNODE_FLAG_USERUSED_ACCOUNTED); 1233 1234 /* Allocate the user/groupused objects if necessary. */ 1235 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { 1236 VERIFY(0 == zap_create_claim(os, 1237 DMU_USERUSED_OBJECT, 1238 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1239 VERIFY(0 == zap_create_claim(os, 1240 DMU_GROUPUSED_OBJECT, 1241 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1242 } 1243 1244 /* 1245 * We intentionally modify the zap object even if the 1246 * net delta is zero. Otherwise 1247 * the block of the zap obj could be shared between 1248 * datasets but need to be different between them after 1249 * a bprewrite. 1250 */ 1251 1252 flags = dn->dn_id_flags; 1253 ASSERT(flags); 1254 if (flags & DN_ID_OLD_EXIST) { 1255 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags, 1256 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx); 1257 } 1258 if (flags & DN_ID_NEW_EXIST) { 1259 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys), 1260 dn->dn_phys->dn_flags, dn->dn_newuid, 1261 dn->dn_newgid, B_FALSE, tx); 1262 } 1263 1264 mutex_enter(&dn->dn_mtx); 1265 dn->dn_oldused = 0; 1266 dn->dn_oldflags = 0; 1267 if (dn->dn_id_flags & DN_ID_NEW_EXIST) { 1268 dn->dn_olduid = dn->dn_newuid; 1269 dn->dn_oldgid = dn->dn_newgid; 1270 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1271 if (dn->dn_bonuslen == 0) 1272 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1273 else 1274 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1275 } 1276 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); 1277 mutex_exit(&dn->dn_mtx); 1278 1279 list_remove(list, dn); 1280 dnode_rele(dn, list); 1281 } 1282 } 1283 1284 /* 1285 * Returns a pointer to data to find uid/gid from 1286 * 1287 * If a dirty record for transaction group that is syncing can't 1288 * be found then NULL is returned. In the NULL case it is assumed 1289 * the uid/gid aren't changing. 1290 */ 1291 static void * 1292 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) 1293 { 1294 dbuf_dirty_record_t *dr, **drp; 1295 void *data; 1296 1297 if (db->db_dirtycnt == 0) 1298 return (db->db.db_data); /* Nothing is changing */ 1299 1300 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1301 if (dr->dr_txg == tx->tx_txg) 1302 break; 1303 1304 if (dr == NULL) { 1305 data = NULL; 1306 } else { 1307 dnode_t *dn; 1308 1309 DB_DNODE_ENTER(dr->dr_dbuf); 1310 dn = DB_DNODE(dr->dr_dbuf); 1311 1312 if (dn->dn_bonuslen == 0 && 1313 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) 1314 data = dr->dt.dl.dr_data->b_data; 1315 else 1316 data = dr->dt.dl.dr_data; 1317 1318 DB_DNODE_EXIT(dr->dr_dbuf); 1319 } 1320 1321 return (data); 1322 } 1323 1324 void 1325 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) 1326 { 1327 objset_t *os = dn->dn_objset; 1328 void *data = NULL; 1329 dmu_buf_impl_t *db = NULL; 1330 uint64_t *user = NULL; 1331 uint64_t *group = NULL; 1332 int flags = dn->dn_id_flags; 1333 int error; 1334 boolean_t have_spill = B_FALSE; 1335 1336 if (!dmu_objset_userused_enabled(dn->dn_objset)) 1337 return; 1338 1339 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| 1340 DN_ID_CHKED_SPILL))) 1341 return; 1342 1343 if (before && dn->dn_bonuslen != 0) 1344 data = DN_BONUS(dn->dn_phys); 1345 else if (!before && dn->dn_bonuslen != 0) { 1346 if (dn->dn_bonus) { 1347 db = dn->dn_bonus; 1348 mutex_enter(&db->db_mtx); 1349 data = dmu_objset_userquota_find_data(db, tx); 1350 } else { 1351 data = DN_BONUS(dn->dn_phys); 1352 } 1353 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { 1354 int rf = 0; 1355 1356 if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) 1357 rf |= DB_RF_HAVESTRUCT; 1358 error = dmu_spill_hold_by_dnode(dn, 1359 rf | DB_RF_MUST_SUCCEED, 1360 FTAG, (dmu_buf_t **)&db); 1361 ASSERT(error == 0); 1362 mutex_enter(&db->db_mtx); 1363 data = (before) ? db->db.db_data : 1364 dmu_objset_userquota_find_data(db, tx); 1365 have_spill = B_TRUE; 1366 } else { 1367 mutex_enter(&dn->dn_mtx); 1368 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1369 mutex_exit(&dn->dn_mtx); 1370 return; 1371 } 1372 1373 if (before) { 1374 ASSERT(data); 1375 user = &dn->dn_olduid; 1376 group = &dn->dn_oldgid; 1377 } else if (data) { 1378 user = &dn->dn_newuid; 1379 group = &dn->dn_newgid; 1380 } 1381 1382 /* 1383 * Must always call the callback in case the object 1384 * type has changed and that type isn't an object type to track 1385 */ 1386 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, 1387 user, group); 1388 1389 /* 1390 * Preserve existing uid/gid when the callback can't determine 1391 * what the new uid/gid are and the callback returned EEXIST. 1392 * The EEXIST error tells us to just use the existing uid/gid. 1393 * If we don't know what the old values are then just assign 1394 * them to 0, since that is a new file being created. 1395 */ 1396 if (!before && data == NULL && error == EEXIST) { 1397 if (flags & DN_ID_OLD_EXIST) { 1398 dn->dn_newuid = dn->dn_olduid; 1399 dn->dn_newgid = dn->dn_oldgid; 1400 } else { 1401 dn->dn_newuid = 0; 1402 dn->dn_newgid = 0; 1403 } 1404 error = 0; 1405 } 1406 1407 if (db) 1408 mutex_exit(&db->db_mtx); 1409 1410 mutex_enter(&dn->dn_mtx); 1411 if (error == 0 && before) 1412 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1413 if (error == 0 && !before) 1414 dn->dn_id_flags |= DN_ID_NEW_EXIST; 1415 1416 if (have_spill) { 1417 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1418 } else { 1419 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1420 } 1421 mutex_exit(&dn->dn_mtx); 1422 if (have_spill) 1423 dmu_buf_rele((dmu_buf_t *)db, FTAG); 1424 } 1425 1426 boolean_t 1427 dmu_objset_userspace_present(objset_t *os) 1428 { 1429 return (os->os_phys->os_flags & 1430 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1431 } 1432 1433 int 1434 dmu_objset_userspace_upgrade(objset_t *os) 1435 { 1436 uint64_t obj; 1437 int err = 0; 1438 1439 if (dmu_objset_userspace_present(os)) 1440 return (0); 1441 if (!dmu_objset_userused_enabled(os)) 1442 return (SET_ERROR(ENOTSUP)); 1443 if (dmu_objset_is_snapshot(os)) 1444 return (SET_ERROR(EINVAL)); 1445 1446 /* 1447 * We simply need to mark every object dirty, so that it will be 1448 * synced out and now accounted. If this is called 1449 * concurrently, or if we already did some work before crashing, 1450 * that's fine, since we track each object's accounted state 1451 * independently. 1452 */ 1453 1454 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1455 dmu_tx_t *tx; 1456 dmu_buf_t *db; 1457 int objerr; 1458 1459 if (issig(JUSTLOOKING) && issig(FORREAL)) 1460 return (SET_ERROR(EINTR)); 1461 1462 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1463 if (objerr != 0) 1464 continue; 1465 tx = dmu_tx_create(os); 1466 dmu_tx_hold_bonus(tx, obj); 1467 objerr = dmu_tx_assign(tx, TXG_WAIT); 1468 if (objerr != 0) { 1469 dmu_tx_abort(tx); 1470 continue; 1471 } 1472 dmu_buf_will_dirty(db, tx); 1473 dmu_buf_rele(db, FTAG); 1474 dmu_tx_commit(tx); 1475 } 1476 1477 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1478 txg_wait_synced(dmu_objset_pool(os), 0); 1479 return (0); 1480 } 1481 1482 void 1483 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1484 uint64_t *usedobjsp, uint64_t *availobjsp) 1485 { 1486 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 1487 usedobjsp, availobjsp); 1488 } 1489 1490 uint64_t 1491 dmu_objset_fsid_guid(objset_t *os) 1492 { 1493 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 1494 } 1495 1496 void 1497 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1498 { 1499 stat->dds_type = os->os_phys->os_type; 1500 if (os->os_dsl_dataset) 1501 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 1502 } 1503 1504 void 1505 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1506 { 1507 ASSERT(os->os_dsl_dataset || 1508 os->os_phys->os_type == DMU_OST_META); 1509 1510 if (os->os_dsl_dataset != NULL) 1511 dsl_dataset_stats(os->os_dsl_dataset, nv); 1512 1513 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1514 os->os_phys->os_type); 1515 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1516 dmu_objset_userspace_present(os)); 1517 } 1518 1519 int 1520 dmu_objset_is_snapshot(objset_t *os) 1521 { 1522 if (os->os_dsl_dataset != NULL) 1523 return (os->os_dsl_dataset->ds_is_snapshot); 1524 else 1525 return (B_FALSE); 1526 } 1527 1528 int 1529 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1530 boolean_t *conflict) 1531 { 1532 dsl_dataset_t *ds = os->os_dsl_dataset; 1533 uint64_t ignored; 1534 1535 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1536 return (SET_ERROR(ENOENT)); 1537 1538 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1539 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored, 1540 MT_FIRST, real, maxlen, conflict)); 1541 } 1542 1543 int 1544 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1545 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1546 { 1547 dsl_dataset_t *ds = os->os_dsl_dataset; 1548 zap_cursor_t cursor; 1549 zap_attribute_t attr; 1550 1551 ASSERT(dsl_pool_config_held(dmu_objset_pool(os))); 1552 1553 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1554 return (SET_ERROR(ENOENT)); 1555 1556 zap_cursor_init_serialized(&cursor, 1557 ds->ds_dir->dd_pool->dp_meta_objset, 1558 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp); 1559 1560 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1561 zap_cursor_fini(&cursor); 1562 return (SET_ERROR(ENOENT)); 1563 } 1564 1565 if (strlen(attr.za_name) + 1 > namelen) { 1566 zap_cursor_fini(&cursor); 1567 return (SET_ERROR(ENAMETOOLONG)); 1568 } 1569 1570 (void) strcpy(name, attr.za_name); 1571 if (idp) 1572 *idp = attr.za_first_integer; 1573 if (case_conflict) 1574 *case_conflict = attr.za_normalization_conflict; 1575 zap_cursor_advance(&cursor); 1576 *offp = zap_cursor_serialize(&cursor); 1577 zap_cursor_fini(&cursor); 1578 1579 return (0); 1580 } 1581 1582 int 1583 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1584 uint64_t *idp, uint64_t *offp) 1585 { 1586 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1587 zap_cursor_t cursor; 1588 zap_attribute_t attr; 1589 1590 /* there is no next dir on a snapshot! */ 1591 if (os->os_dsl_dataset->ds_object != 1592 dsl_dir_phys(dd)->dd_head_dataset_obj) 1593 return (SET_ERROR(ENOENT)); 1594 1595 zap_cursor_init_serialized(&cursor, 1596 dd->dd_pool->dp_meta_objset, 1597 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp); 1598 1599 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1600 zap_cursor_fini(&cursor); 1601 return (SET_ERROR(ENOENT)); 1602 } 1603 1604 if (strlen(attr.za_name) + 1 > namelen) { 1605 zap_cursor_fini(&cursor); 1606 return (SET_ERROR(ENAMETOOLONG)); 1607 } 1608 1609 (void) strcpy(name, attr.za_name); 1610 if (idp) 1611 *idp = attr.za_first_integer; 1612 zap_cursor_advance(&cursor); 1613 *offp = zap_cursor_serialize(&cursor); 1614 zap_cursor_fini(&cursor); 1615 1616 return (0); 1617 } 1618 1619 typedef struct dmu_objset_find_ctx { 1620 taskq_t *dc_tq; 1621 dsl_pool_t *dc_dp; 1622 uint64_t dc_ddobj; 1623 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *); 1624 void *dc_arg; 1625 int dc_flags; 1626 kmutex_t *dc_error_lock; 1627 int *dc_error; 1628 } dmu_objset_find_ctx_t; 1629 1630 static void 1631 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp) 1632 { 1633 dsl_pool_t *dp = dcp->dc_dp; 1634 dmu_objset_find_ctx_t *child_dcp; 1635 dsl_dir_t *dd; 1636 dsl_dataset_t *ds; 1637 zap_cursor_t zc; 1638 zap_attribute_t *attr; 1639 uint64_t thisobj; 1640 int err = 0; 1641 1642 /* don't process if there already was an error */ 1643 if (*dcp->dc_error != 0) 1644 goto out; 1645 1646 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd); 1647 if (err != 0) 1648 goto out; 1649 1650 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1651 if (dd->dd_myname[0] == '$') { 1652 dsl_dir_rele(dd, FTAG); 1653 goto out; 1654 } 1655 1656 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1657 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1658 1659 /* 1660 * Iterate over all children. 1661 */ 1662 if (dcp->dc_flags & DS_FIND_CHILDREN) { 1663 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1664 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1665 zap_cursor_retrieve(&zc, attr) == 0; 1666 (void) zap_cursor_advance(&zc)) { 1667 ASSERT3U(attr->za_integer_length, ==, 1668 sizeof (uint64_t)); 1669 ASSERT3U(attr->za_num_integers, ==, 1); 1670 1671 child_dcp = kmem_alloc(sizeof (*child_dcp), KM_SLEEP); 1672 *child_dcp = *dcp; 1673 child_dcp->dc_ddobj = attr->za_first_integer; 1674 if (dcp->dc_tq != NULL) 1675 (void) taskq_dispatch(dcp->dc_tq, 1676 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP); 1677 else 1678 dmu_objset_find_dp_impl(child_dcp); 1679 } 1680 zap_cursor_fini(&zc); 1681 } 1682 1683 /* 1684 * Iterate over all snapshots. 1685 */ 1686 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) { 1687 dsl_dataset_t *ds; 1688 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1689 1690 if (err == 0) { 1691 uint64_t snapobj; 1692 1693 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1694 dsl_dataset_rele(ds, FTAG); 1695 1696 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1697 zap_cursor_retrieve(&zc, attr) == 0; 1698 (void) zap_cursor_advance(&zc)) { 1699 ASSERT3U(attr->za_integer_length, ==, 1700 sizeof (uint64_t)); 1701 ASSERT3U(attr->za_num_integers, ==, 1); 1702 1703 err = dsl_dataset_hold_obj(dp, 1704 attr->za_first_integer, FTAG, &ds); 1705 if (err != 0) 1706 break; 1707 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1708 dsl_dataset_rele(ds, FTAG); 1709 if (err != 0) 1710 break; 1711 } 1712 zap_cursor_fini(&zc); 1713 } 1714 } 1715 1716 dsl_dir_rele(dd, FTAG); 1717 kmem_free(attr, sizeof (zap_attribute_t)); 1718 1719 if (err != 0) 1720 goto out; 1721 1722 /* 1723 * Apply to self. 1724 */ 1725 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1726 if (err != 0) 1727 goto out; 1728 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1729 dsl_dataset_rele(ds, FTAG); 1730 1731 out: 1732 if (err != 0) { 1733 mutex_enter(dcp->dc_error_lock); 1734 /* only keep first error */ 1735 if (*dcp->dc_error == 0) 1736 *dcp->dc_error = err; 1737 mutex_exit(dcp->dc_error_lock); 1738 } 1739 1740 kmem_free(dcp, sizeof (*dcp)); 1741 } 1742 1743 static void 1744 dmu_objset_find_dp_cb(void *arg) 1745 { 1746 dmu_objset_find_ctx_t *dcp = arg; 1747 dsl_pool_t *dp = dcp->dc_dp; 1748 1749 /* 1750 * We need to get a pool_config_lock here, as there are several 1751 * asssert(pool_config_held) down the stack. Getting a lock via 1752 * dsl_pool_config_enter is risky, as it might be stalled by a 1753 * pending writer. This would deadlock, as the write lock can 1754 * only be granted when our parent thread gives up the lock. 1755 * The _prio interface gives us priority over a pending writer. 1756 */ 1757 dsl_pool_config_enter_prio(dp, FTAG); 1758 1759 dmu_objset_find_dp_impl(dcp); 1760 1761 dsl_pool_config_exit(dp, FTAG); 1762 } 1763 1764 /* 1765 * Find objsets under and including ddobj, call func(ds) on each. 1766 * The order for the enumeration is completely undefined. 1767 * func is called with dsl_pool_config held. 1768 */ 1769 int 1770 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj, 1771 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags) 1772 { 1773 int error = 0; 1774 taskq_t *tq = NULL; 1775 int ntasks; 1776 dmu_objset_find_ctx_t *dcp; 1777 kmutex_t err_lock; 1778 1779 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL); 1780 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP); 1781 dcp->dc_tq = NULL; 1782 dcp->dc_dp = dp; 1783 dcp->dc_ddobj = ddobj; 1784 dcp->dc_func = func; 1785 dcp->dc_arg = arg; 1786 dcp->dc_flags = flags; 1787 dcp->dc_error_lock = &err_lock; 1788 dcp->dc_error = &error; 1789 1790 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) { 1791 /* 1792 * In case a write lock is held we can't make use of 1793 * parallelism, as down the stack of the worker threads 1794 * the lock is asserted via dsl_pool_config_held. 1795 * In case of a read lock this is solved by getting a read 1796 * lock in each worker thread, which isn't possible in case 1797 * of a writer lock. So we fall back to the synchronous path 1798 * here. 1799 * In the future it might be possible to get some magic into 1800 * dsl_pool_config_held in a way that it returns true for 1801 * the worker threads so that a single lock held from this 1802 * thread suffices. For now, stay single threaded. 1803 */ 1804 dmu_objset_find_dp_impl(dcp); 1805 1806 return (error); 1807 } 1808 1809 ntasks = dmu_find_threads; 1810 if (ntasks == 0) 1811 ntasks = vdev_count_leaves(dp->dp_spa) * 4; 1812 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks, 1813 INT_MAX, 0); 1814 if (tq == NULL) { 1815 kmem_free(dcp, sizeof (*dcp)); 1816 return (SET_ERROR(ENOMEM)); 1817 } 1818 dcp->dc_tq = tq; 1819 1820 /* dcp will be freed by task */ 1821 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP); 1822 1823 /* 1824 * PORTING: this code relies on the property of taskq_wait to wait 1825 * until no more tasks are queued and no more tasks are active. As 1826 * we always queue new tasks from within other tasks, task_wait 1827 * reliably waits for the full recursion to finish, even though we 1828 * enqueue new tasks after taskq_wait has been called. 1829 * On platforms other than illumos, taskq_wait may not have this 1830 * property. 1831 */ 1832 taskq_wait(tq); 1833 taskq_destroy(tq); 1834 mutex_destroy(&err_lock); 1835 1836 return (error); 1837 } 1838 1839 /* 1840 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1841 * The dp_config_rwlock must not be held when this is called, and it 1842 * will not be held when the callback is called. 1843 * Therefore this function should only be used when the pool is not changing 1844 * (e.g. in syncing context), or the callback can deal with the possible races. 1845 */ 1846 static int 1847 dmu_objset_find_impl(spa_t *spa, const char *name, 1848 int func(const char *, void *), void *arg, int flags) 1849 { 1850 dsl_dir_t *dd; 1851 dsl_pool_t *dp = spa_get_dsl(spa); 1852 dsl_dataset_t *ds; 1853 zap_cursor_t zc; 1854 zap_attribute_t *attr; 1855 char *child; 1856 uint64_t thisobj; 1857 int err; 1858 1859 dsl_pool_config_enter(dp, FTAG); 1860 1861 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL); 1862 if (err != 0) { 1863 dsl_pool_config_exit(dp, FTAG); 1864 return (err); 1865 } 1866 1867 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1868 if (dd->dd_myname[0] == '$') { 1869 dsl_dir_rele(dd, FTAG); 1870 dsl_pool_config_exit(dp, FTAG); 1871 return (0); 1872 } 1873 1874 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1875 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1876 1877 /* 1878 * Iterate over all children. 1879 */ 1880 if (flags & DS_FIND_CHILDREN) { 1881 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1882 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1883 zap_cursor_retrieve(&zc, attr) == 0; 1884 (void) zap_cursor_advance(&zc)) { 1885 ASSERT3U(attr->za_integer_length, ==, 1886 sizeof (uint64_t)); 1887 ASSERT3U(attr->za_num_integers, ==, 1); 1888 1889 child = kmem_asprintf("%s/%s", name, attr->za_name); 1890 dsl_pool_config_exit(dp, FTAG); 1891 err = dmu_objset_find_impl(spa, child, 1892 func, arg, flags); 1893 dsl_pool_config_enter(dp, FTAG); 1894 strfree(child); 1895 if (err != 0) 1896 break; 1897 } 1898 zap_cursor_fini(&zc); 1899 1900 if (err != 0) { 1901 dsl_dir_rele(dd, FTAG); 1902 dsl_pool_config_exit(dp, FTAG); 1903 kmem_free(attr, sizeof (zap_attribute_t)); 1904 return (err); 1905 } 1906 } 1907 1908 /* 1909 * Iterate over all snapshots. 1910 */ 1911 if (flags & DS_FIND_SNAPSHOTS) { 1912 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1913 1914 if (err == 0) { 1915 uint64_t snapobj; 1916 1917 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1918 dsl_dataset_rele(ds, FTAG); 1919 1920 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1921 zap_cursor_retrieve(&zc, attr) == 0; 1922 (void) zap_cursor_advance(&zc)) { 1923 ASSERT3U(attr->za_integer_length, ==, 1924 sizeof (uint64_t)); 1925 ASSERT3U(attr->za_num_integers, ==, 1); 1926 1927 child = kmem_asprintf("%s@%s", 1928 name, attr->za_name); 1929 dsl_pool_config_exit(dp, FTAG); 1930 err = func(child, arg); 1931 dsl_pool_config_enter(dp, FTAG); 1932 strfree(child); 1933 if (err != 0) 1934 break; 1935 } 1936 zap_cursor_fini(&zc); 1937 } 1938 } 1939 1940 dsl_dir_rele(dd, FTAG); 1941 kmem_free(attr, sizeof (zap_attribute_t)); 1942 dsl_pool_config_exit(dp, FTAG); 1943 1944 if (err != 0) 1945 return (err); 1946 1947 /* Apply to self. */ 1948 return (func(name, arg)); 1949 } 1950 1951 /* 1952 * See comment above dmu_objset_find_impl(). 1953 */ 1954 int 1955 dmu_objset_find(char *name, int func(const char *, void *), void *arg, 1956 int flags) 1957 { 1958 spa_t *spa; 1959 int error; 1960 1961 error = spa_open(name, &spa, FTAG); 1962 if (error != 0) 1963 return (error); 1964 error = dmu_objset_find_impl(spa, name, func, arg, flags); 1965 spa_close(spa, FTAG); 1966 return (error); 1967 } 1968 1969 void 1970 dmu_objset_set_user(objset_t *os, void *user_ptr) 1971 { 1972 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1973 os->os_user_ptr = user_ptr; 1974 } 1975 1976 void * 1977 dmu_objset_get_user(objset_t *os) 1978 { 1979 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1980 return (os->os_user_ptr); 1981 } 1982 1983 /* 1984 * Determine name of filesystem, given name of snapshot. 1985 * buf must be at least MAXNAMELEN bytes 1986 */ 1987 int 1988 dmu_fsname(const char *snapname, char *buf) 1989 { 1990 char *atp = strchr(snapname, '@'); 1991 if (atp == NULL) 1992 return (SET_ERROR(EINVAL)); 1993 if (atp - snapname >= MAXNAMELEN) 1994 return (SET_ERROR(ENAMETOOLONG)); 1995 (void) strlcpy(buf, snapname, atp - snapname + 1); 1996 return (0); 1997 } 1998