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 dsl_prop_unregister_all(ds, os); 685 686 if (os->os_sa) 687 sa_tear_down(os); 688 689 os->os_evicting = B_TRUE; 690 dmu_objset_evict_dbufs(os); 691 692 mutex_enter(&os->os_lock); 693 spa_evicting_os_register(os->os_spa, os); 694 if (list_is_empty(&os->os_dnodes)) { 695 mutex_exit(&os->os_lock); 696 dmu_objset_evict_done(os); 697 } else { 698 mutex_exit(&os->os_lock); 699 } 700 } 701 702 void 703 dmu_objset_evict_done(objset_t *os) 704 { 705 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 706 707 dnode_special_close(&os->os_meta_dnode); 708 if (DMU_USERUSED_DNODE(os)) { 709 dnode_special_close(&os->os_userused_dnode); 710 dnode_special_close(&os->os_groupused_dnode); 711 } 712 zil_free(os->os_zil); 713 714 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf)); 715 716 /* 717 * This is a barrier to prevent the objset from going away in 718 * dnode_move() until we can safely ensure that the objset is still in 719 * use. We consider the objset valid before the barrier and invalid 720 * after the barrier. 721 */ 722 rw_enter(&os_lock, RW_READER); 723 rw_exit(&os_lock); 724 725 mutex_destroy(&os->os_lock); 726 mutex_destroy(&os->os_obj_lock); 727 mutex_destroy(&os->os_user_ptr_lock); 728 spa_evicting_os_deregister(os->os_spa, os); 729 kmem_free(os, sizeof (objset_t)); 730 } 731 732 timestruc_t 733 dmu_objset_snap_cmtime(objset_t *os) 734 { 735 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); 736 } 737 738 /* called from dsl for meta-objset */ 739 objset_t * 740 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 741 dmu_objset_type_t type, dmu_tx_t *tx) 742 { 743 objset_t *os; 744 dnode_t *mdn; 745 746 ASSERT(dmu_tx_is_syncing(tx)); 747 748 if (ds != NULL) 749 VERIFY0(dmu_objset_from_ds(ds, &os)); 750 else 751 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os)); 752 753 mdn = DMU_META_DNODE(os); 754 755 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 756 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 757 758 /* 759 * We don't want to have to increase the meta-dnode's nlevels 760 * later, because then we could do it in quescing context while 761 * we are also accessing it in open context. 762 * 763 * This precaution is not necessary for the MOS (ds == NULL), 764 * because the MOS is only updated in syncing context. 765 * This is most fortunate: the MOS is the only objset that 766 * needs to be synced multiple times as spa_sync() iterates 767 * to convergence, so minimizing its dn_nlevels matters. 768 */ 769 if (ds != NULL) { 770 int levels = 1; 771 772 /* 773 * Determine the number of levels necessary for the meta-dnode 774 * to contain DN_MAX_OBJECT dnodes. 775 */ 776 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 777 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 778 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 779 levels++; 780 781 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 782 mdn->dn_nlevels = levels; 783 } 784 785 ASSERT(type != DMU_OST_NONE); 786 ASSERT(type != DMU_OST_ANY); 787 ASSERT(type < DMU_OST_NUMTYPES); 788 os->os_phys->os_type = type; 789 if (dmu_objset_userused_enabled(os)) { 790 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 791 os->os_flags = os->os_phys->os_flags; 792 } 793 794 dsl_dataset_dirty(ds, tx); 795 796 return (os); 797 } 798 799 typedef struct dmu_objset_create_arg { 800 const char *doca_name; 801 cred_t *doca_cred; 802 void (*doca_userfunc)(objset_t *os, void *arg, 803 cred_t *cr, dmu_tx_t *tx); 804 void *doca_userarg; 805 dmu_objset_type_t doca_type; 806 uint64_t doca_flags; 807 } dmu_objset_create_arg_t; 808 809 /*ARGSUSED*/ 810 static int 811 dmu_objset_create_check(void *arg, dmu_tx_t *tx) 812 { 813 dmu_objset_create_arg_t *doca = arg; 814 dsl_pool_t *dp = dmu_tx_pool(tx); 815 dsl_dir_t *pdd; 816 const char *tail; 817 int error; 818 819 if (strchr(doca->doca_name, '@') != NULL) 820 return (SET_ERROR(EINVAL)); 821 822 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail); 823 if (error != 0) 824 return (error); 825 if (tail == NULL) { 826 dsl_dir_rele(pdd, FTAG); 827 return (SET_ERROR(EEXIST)); 828 } 829 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 830 doca->doca_cred); 831 dsl_dir_rele(pdd, FTAG); 832 833 return (error); 834 } 835 836 static void 837 dmu_objset_create_sync(void *arg, dmu_tx_t *tx) 838 { 839 dmu_objset_create_arg_t *doca = arg; 840 dsl_pool_t *dp = dmu_tx_pool(tx); 841 dsl_dir_t *pdd; 842 const char *tail; 843 dsl_dataset_t *ds; 844 uint64_t obj; 845 blkptr_t *bp; 846 objset_t *os; 847 848 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail)); 849 850 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags, 851 doca->doca_cred, tx); 852 853 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 854 bp = dsl_dataset_get_blkptr(ds); 855 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa, 856 ds, bp, doca->doca_type, tx); 857 858 if (doca->doca_userfunc != NULL) { 859 doca->doca_userfunc(os, doca->doca_userarg, 860 doca->doca_cred, tx); 861 } 862 863 spa_history_log_internal_ds(ds, "create", tx, ""); 864 dsl_dataset_rele(ds, FTAG); 865 dsl_dir_rele(pdd, FTAG); 866 } 867 868 int 869 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 870 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 871 { 872 dmu_objset_create_arg_t doca; 873 874 doca.doca_name = name; 875 doca.doca_cred = CRED(); 876 doca.doca_flags = flags; 877 doca.doca_userfunc = func; 878 doca.doca_userarg = arg; 879 doca.doca_type = type; 880 881 return (dsl_sync_task(name, 882 dmu_objset_create_check, dmu_objset_create_sync, &doca, 883 5, ZFS_SPACE_CHECK_NORMAL)); 884 } 885 886 typedef struct dmu_objset_clone_arg { 887 const char *doca_clone; 888 const char *doca_origin; 889 cred_t *doca_cred; 890 } dmu_objset_clone_arg_t; 891 892 /*ARGSUSED*/ 893 static int 894 dmu_objset_clone_check(void *arg, dmu_tx_t *tx) 895 { 896 dmu_objset_clone_arg_t *doca = arg; 897 dsl_dir_t *pdd; 898 const char *tail; 899 int error; 900 dsl_dataset_t *origin; 901 dsl_pool_t *dp = dmu_tx_pool(tx); 902 903 if (strchr(doca->doca_clone, '@') != NULL) 904 return (SET_ERROR(EINVAL)); 905 906 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail); 907 if (error != 0) 908 return (error); 909 if (tail == NULL) { 910 dsl_dir_rele(pdd, FTAG); 911 return (SET_ERROR(EEXIST)); 912 } 913 914 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 915 doca->doca_cred); 916 if (error != 0) { 917 dsl_dir_rele(pdd, FTAG); 918 return (SET_ERROR(EDQUOT)); 919 } 920 dsl_dir_rele(pdd, FTAG); 921 922 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin); 923 if (error != 0) 924 return (error); 925 926 /* You can only clone snapshots, not the head datasets. */ 927 if (!origin->ds_is_snapshot) { 928 dsl_dataset_rele(origin, FTAG); 929 return (SET_ERROR(EINVAL)); 930 } 931 dsl_dataset_rele(origin, FTAG); 932 933 return (0); 934 } 935 936 static void 937 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx) 938 { 939 dmu_objset_clone_arg_t *doca = arg; 940 dsl_pool_t *dp = dmu_tx_pool(tx); 941 dsl_dir_t *pdd; 942 const char *tail; 943 dsl_dataset_t *origin, *ds; 944 uint64_t obj; 945 char namebuf[MAXNAMELEN]; 946 947 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail)); 948 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin)); 949 950 obj = dsl_dataset_create_sync(pdd, tail, origin, 0, 951 doca->doca_cred, tx); 952 953 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 954 dsl_dataset_name(origin, namebuf); 955 spa_history_log_internal_ds(ds, "clone", tx, 956 "origin=%s (%llu)", namebuf, origin->ds_object); 957 dsl_dataset_rele(ds, FTAG); 958 dsl_dataset_rele(origin, FTAG); 959 dsl_dir_rele(pdd, FTAG); 960 } 961 962 int 963 dmu_objset_clone(const char *clone, const char *origin) 964 { 965 dmu_objset_clone_arg_t doca; 966 967 doca.doca_clone = clone; 968 doca.doca_origin = origin; 969 doca.doca_cred = CRED(); 970 971 return (dsl_sync_task(clone, 972 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 973 5, ZFS_SPACE_CHECK_NORMAL)); 974 } 975 976 int 977 dmu_objset_snapshot_one(const char *fsname, const char *snapname) 978 { 979 int err; 980 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname); 981 nvlist_t *snaps = fnvlist_alloc(); 982 983 fnvlist_add_boolean(snaps, longsnap); 984 strfree(longsnap); 985 err = dsl_dataset_snapshot(snaps, NULL, NULL); 986 fnvlist_free(snaps); 987 return (err); 988 } 989 990 static void 991 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) 992 { 993 dnode_t *dn; 994 995 while (dn = list_head(list)) { 996 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 997 ASSERT(dn->dn_dbuf->db_data_pending); 998 /* 999 * Initialize dn_zio outside dnode_sync() because the 1000 * meta-dnode needs to set it ouside dnode_sync(). 1001 */ 1002 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 1003 ASSERT(dn->dn_zio); 1004 1005 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 1006 list_remove(list, dn); 1007 1008 if (newlist) { 1009 (void) dnode_add_ref(dn, newlist); 1010 list_insert_tail(newlist, dn); 1011 } 1012 1013 dnode_sync(dn, tx); 1014 } 1015 } 1016 1017 /* ARGSUSED */ 1018 static void 1019 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) 1020 { 1021 blkptr_t *bp = zio->io_bp; 1022 objset_t *os = arg; 1023 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 1024 1025 ASSERT(!BP_IS_EMBEDDED(bp)); 1026 ASSERT3P(bp, ==, os->os_rootbp); 1027 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET); 1028 ASSERT0(BP_GET_LEVEL(bp)); 1029 1030 /* 1031 * Update rootbp fill count: it should be the number of objects 1032 * allocated in the object set (not counting the "special" 1033 * objects that are stored in the objset_phys_t -- the meta 1034 * dnode and user/group accounting objects). 1035 */ 1036 bp->blk_fill = 0; 1037 for (int i = 0; i < dnp->dn_nblkptr; i++) 1038 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]); 1039 } 1040 1041 /* ARGSUSED */ 1042 static void 1043 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) 1044 { 1045 blkptr_t *bp = zio->io_bp; 1046 blkptr_t *bp_orig = &zio->io_bp_orig; 1047 objset_t *os = arg; 1048 1049 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 1050 ASSERT(BP_EQUAL(bp, bp_orig)); 1051 } else { 1052 dsl_dataset_t *ds = os->os_dsl_dataset; 1053 dmu_tx_t *tx = os->os_synctx; 1054 1055 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 1056 dsl_dataset_block_born(ds, bp, tx); 1057 } 1058 } 1059 1060 /* called from dsl */ 1061 void 1062 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 1063 { 1064 int txgoff; 1065 zbookmark_phys_t zb; 1066 zio_prop_t zp; 1067 zio_t *zio; 1068 list_t *list; 1069 list_t *newlist = NULL; 1070 dbuf_dirty_record_t *dr; 1071 1072 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 1073 1074 ASSERT(dmu_tx_is_syncing(tx)); 1075 /* XXX the write_done callback should really give us the tx... */ 1076 os->os_synctx = tx; 1077 1078 if (os->os_dsl_dataset == NULL) { 1079 /* 1080 * This is the MOS. If we have upgraded, 1081 * spa_max_replication() could change, so reset 1082 * os_copies here. 1083 */ 1084 os->os_copies = spa_max_replication(os->os_spa); 1085 } 1086 1087 /* 1088 * Create the root block IO 1089 */ 1090 SET_BOOKMARK(&zb, os->os_dsl_dataset ? 1091 os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1092 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 1093 arc_release(os->os_phys_buf, &os->os_phys_buf); 1094 1095 dmu_write_policy(os, NULL, 0, 0, &zp); 1096 1097 zio = arc_write(pio, os->os_spa, tx->tx_txg, 1098 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), 1099 DMU_OS_IS_L2COMPRESSIBLE(os), &zp, dmu_objset_write_ready, 1100 NULL, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE, 1101 ZIO_FLAG_MUSTSUCCEED, &zb); 1102 1103 /* 1104 * Sync special dnodes - the parent IO for the sync is the root block 1105 */ 1106 DMU_META_DNODE(os)->dn_zio = zio; 1107 dnode_sync(DMU_META_DNODE(os), tx); 1108 1109 os->os_phys->os_flags = os->os_flags; 1110 1111 if (DMU_USERUSED_DNODE(os) && 1112 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { 1113 DMU_USERUSED_DNODE(os)->dn_zio = zio; 1114 dnode_sync(DMU_USERUSED_DNODE(os), tx); 1115 DMU_GROUPUSED_DNODE(os)->dn_zio = zio; 1116 dnode_sync(DMU_GROUPUSED_DNODE(os), tx); 1117 } 1118 1119 txgoff = tx->tx_txg & TXG_MASK; 1120 1121 if (dmu_objset_userused_enabled(os)) { 1122 newlist = &os->os_synced_dnodes; 1123 /* 1124 * We must create the list here because it uses the 1125 * dn_dirty_link[] of this txg. 1126 */ 1127 list_create(newlist, sizeof (dnode_t), 1128 offsetof(dnode_t, dn_dirty_link[txgoff])); 1129 } 1130 1131 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); 1132 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); 1133 1134 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; 1135 while (dr = list_head(list)) { 1136 ASSERT0(dr->dr_dbuf->db_level); 1137 list_remove(list, dr); 1138 if (dr->dr_zio) 1139 zio_nowait(dr->dr_zio); 1140 } 1141 /* 1142 * Free intent log blocks up to this tx. 1143 */ 1144 zil_sync(os->os_zil, tx); 1145 os->os_phys->os_zil_header = os->os_zil_header; 1146 zio_nowait(zio); 1147 } 1148 1149 boolean_t 1150 dmu_objset_is_dirty(objset_t *os, uint64_t txg) 1151 { 1152 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) || 1153 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK])); 1154 } 1155 1156 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1157 1158 void 1159 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1160 { 1161 used_cbs[ost] = cb; 1162 } 1163 1164 boolean_t 1165 dmu_objset_userused_enabled(objset_t *os) 1166 { 1167 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1168 used_cbs[os->os_phys->os_type] != NULL && 1169 DMU_USERUSED_DNODE(os) != NULL); 1170 } 1171 1172 static void 1173 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags, 1174 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx) 1175 { 1176 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { 1177 int64_t delta = DNODE_SIZE + used; 1178 if (subtract) 1179 delta = -delta; 1180 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT, 1181 user, delta, tx)); 1182 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT, 1183 group, delta, tx)); 1184 } 1185 } 1186 1187 void 1188 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) 1189 { 1190 dnode_t *dn; 1191 list_t *list = &os->os_synced_dnodes; 1192 1193 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); 1194 1195 while (dn = list_head(list)) { 1196 int flags; 1197 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1198 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1199 dn->dn_phys->dn_flags & 1200 DNODE_FLAG_USERUSED_ACCOUNTED); 1201 1202 /* Allocate the user/groupused objects if necessary. */ 1203 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { 1204 VERIFY(0 == zap_create_claim(os, 1205 DMU_USERUSED_OBJECT, 1206 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1207 VERIFY(0 == zap_create_claim(os, 1208 DMU_GROUPUSED_OBJECT, 1209 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1210 } 1211 1212 /* 1213 * We intentionally modify the zap object even if the 1214 * net delta is zero. Otherwise 1215 * the block of the zap obj could be shared between 1216 * datasets but need to be different between them after 1217 * a bprewrite. 1218 */ 1219 1220 flags = dn->dn_id_flags; 1221 ASSERT(flags); 1222 if (flags & DN_ID_OLD_EXIST) { 1223 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags, 1224 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx); 1225 } 1226 if (flags & DN_ID_NEW_EXIST) { 1227 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys), 1228 dn->dn_phys->dn_flags, dn->dn_newuid, 1229 dn->dn_newgid, B_FALSE, tx); 1230 } 1231 1232 mutex_enter(&dn->dn_mtx); 1233 dn->dn_oldused = 0; 1234 dn->dn_oldflags = 0; 1235 if (dn->dn_id_flags & DN_ID_NEW_EXIST) { 1236 dn->dn_olduid = dn->dn_newuid; 1237 dn->dn_oldgid = dn->dn_newgid; 1238 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1239 if (dn->dn_bonuslen == 0) 1240 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1241 else 1242 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1243 } 1244 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); 1245 mutex_exit(&dn->dn_mtx); 1246 1247 list_remove(list, dn); 1248 dnode_rele(dn, list); 1249 } 1250 } 1251 1252 /* 1253 * Returns a pointer to data to find uid/gid from 1254 * 1255 * If a dirty record for transaction group that is syncing can't 1256 * be found then NULL is returned. In the NULL case it is assumed 1257 * the uid/gid aren't changing. 1258 */ 1259 static void * 1260 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) 1261 { 1262 dbuf_dirty_record_t *dr, **drp; 1263 void *data; 1264 1265 if (db->db_dirtycnt == 0) 1266 return (db->db.db_data); /* Nothing is changing */ 1267 1268 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1269 if (dr->dr_txg == tx->tx_txg) 1270 break; 1271 1272 if (dr == NULL) { 1273 data = NULL; 1274 } else { 1275 dnode_t *dn; 1276 1277 DB_DNODE_ENTER(dr->dr_dbuf); 1278 dn = DB_DNODE(dr->dr_dbuf); 1279 1280 if (dn->dn_bonuslen == 0 && 1281 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) 1282 data = dr->dt.dl.dr_data->b_data; 1283 else 1284 data = dr->dt.dl.dr_data; 1285 1286 DB_DNODE_EXIT(dr->dr_dbuf); 1287 } 1288 1289 return (data); 1290 } 1291 1292 void 1293 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) 1294 { 1295 objset_t *os = dn->dn_objset; 1296 void *data = NULL; 1297 dmu_buf_impl_t *db = NULL; 1298 uint64_t *user = NULL; 1299 uint64_t *group = NULL; 1300 int flags = dn->dn_id_flags; 1301 int error; 1302 boolean_t have_spill = B_FALSE; 1303 1304 if (!dmu_objset_userused_enabled(dn->dn_objset)) 1305 return; 1306 1307 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| 1308 DN_ID_CHKED_SPILL))) 1309 return; 1310 1311 if (before && dn->dn_bonuslen != 0) 1312 data = DN_BONUS(dn->dn_phys); 1313 else if (!before && dn->dn_bonuslen != 0) { 1314 if (dn->dn_bonus) { 1315 db = dn->dn_bonus; 1316 mutex_enter(&db->db_mtx); 1317 data = dmu_objset_userquota_find_data(db, tx); 1318 } else { 1319 data = DN_BONUS(dn->dn_phys); 1320 } 1321 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { 1322 int rf = 0; 1323 1324 if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) 1325 rf |= DB_RF_HAVESTRUCT; 1326 error = dmu_spill_hold_by_dnode(dn, 1327 rf | DB_RF_MUST_SUCCEED, 1328 FTAG, (dmu_buf_t **)&db); 1329 ASSERT(error == 0); 1330 mutex_enter(&db->db_mtx); 1331 data = (before) ? db->db.db_data : 1332 dmu_objset_userquota_find_data(db, tx); 1333 have_spill = B_TRUE; 1334 } else { 1335 mutex_enter(&dn->dn_mtx); 1336 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1337 mutex_exit(&dn->dn_mtx); 1338 return; 1339 } 1340 1341 if (before) { 1342 ASSERT(data); 1343 user = &dn->dn_olduid; 1344 group = &dn->dn_oldgid; 1345 } else if (data) { 1346 user = &dn->dn_newuid; 1347 group = &dn->dn_newgid; 1348 } 1349 1350 /* 1351 * Must always call the callback in case the object 1352 * type has changed and that type isn't an object type to track 1353 */ 1354 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, 1355 user, group); 1356 1357 /* 1358 * Preserve existing uid/gid when the callback can't determine 1359 * what the new uid/gid are and the callback returned EEXIST. 1360 * The EEXIST error tells us to just use the existing uid/gid. 1361 * If we don't know what the old values are then just assign 1362 * them to 0, since that is a new file being created. 1363 */ 1364 if (!before && data == NULL && error == EEXIST) { 1365 if (flags & DN_ID_OLD_EXIST) { 1366 dn->dn_newuid = dn->dn_olduid; 1367 dn->dn_newgid = dn->dn_oldgid; 1368 } else { 1369 dn->dn_newuid = 0; 1370 dn->dn_newgid = 0; 1371 } 1372 error = 0; 1373 } 1374 1375 if (db) 1376 mutex_exit(&db->db_mtx); 1377 1378 mutex_enter(&dn->dn_mtx); 1379 if (error == 0 && before) 1380 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1381 if (error == 0 && !before) 1382 dn->dn_id_flags |= DN_ID_NEW_EXIST; 1383 1384 if (have_spill) { 1385 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1386 } else { 1387 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1388 } 1389 mutex_exit(&dn->dn_mtx); 1390 if (have_spill) 1391 dmu_buf_rele((dmu_buf_t *)db, FTAG); 1392 } 1393 1394 boolean_t 1395 dmu_objset_userspace_present(objset_t *os) 1396 { 1397 return (os->os_phys->os_flags & 1398 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1399 } 1400 1401 int 1402 dmu_objset_userspace_upgrade(objset_t *os) 1403 { 1404 uint64_t obj; 1405 int err = 0; 1406 1407 if (dmu_objset_userspace_present(os)) 1408 return (0); 1409 if (!dmu_objset_userused_enabled(os)) 1410 return (SET_ERROR(ENOTSUP)); 1411 if (dmu_objset_is_snapshot(os)) 1412 return (SET_ERROR(EINVAL)); 1413 1414 /* 1415 * We simply need to mark every object dirty, so that it will be 1416 * synced out and now accounted. If this is called 1417 * concurrently, or if we already did some work before crashing, 1418 * that's fine, since we track each object's accounted state 1419 * independently. 1420 */ 1421 1422 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1423 dmu_tx_t *tx; 1424 dmu_buf_t *db; 1425 int objerr; 1426 1427 if (issig(JUSTLOOKING) && issig(FORREAL)) 1428 return (SET_ERROR(EINTR)); 1429 1430 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1431 if (objerr != 0) 1432 continue; 1433 tx = dmu_tx_create(os); 1434 dmu_tx_hold_bonus(tx, obj); 1435 objerr = dmu_tx_assign(tx, TXG_WAIT); 1436 if (objerr != 0) { 1437 dmu_tx_abort(tx); 1438 continue; 1439 } 1440 dmu_buf_will_dirty(db, tx); 1441 dmu_buf_rele(db, FTAG); 1442 dmu_tx_commit(tx); 1443 } 1444 1445 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1446 txg_wait_synced(dmu_objset_pool(os), 0); 1447 return (0); 1448 } 1449 1450 void 1451 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1452 uint64_t *usedobjsp, uint64_t *availobjsp) 1453 { 1454 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 1455 usedobjsp, availobjsp); 1456 } 1457 1458 uint64_t 1459 dmu_objset_fsid_guid(objset_t *os) 1460 { 1461 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 1462 } 1463 1464 void 1465 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1466 { 1467 stat->dds_type = os->os_phys->os_type; 1468 if (os->os_dsl_dataset) 1469 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 1470 } 1471 1472 void 1473 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1474 { 1475 ASSERT(os->os_dsl_dataset || 1476 os->os_phys->os_type == DMU_OST_META); 1477 1478 if (os->os_dsl_dataset != NULL) 1479 dsl_dataset_stats(os->os_dsl_dataset, nv); 1480 1481 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1482 os->os_phys->os_type); 1483 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1484 dmu_objset_userspace_present(os)); 1485 } 1486 1487 int 1488 dmu_objset_is_snapshot(objset_t *os) 1489 { 1490 if (os->os_dsl_dataset != NULL) 1491 return (os->os_dsl_dataset->ds_is_snapshot); 1492 else 1493 return (B_FALSE); 1494 } 1495 1496 int 1497 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1498 boolean_t *conflict) 1499 { 1500 dsl_dataset_t *ds = os->os_dsl_dataset; 1501 uint64_t ignored; 1502 1503 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1504 return (SET_ERROR(ENOENT)); 1505 1506 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1507 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored, 1508 MT_FIRST, real, maxlen, conflict)); 1509 } 1510 1511 int 1512 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1513 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1514 { 1515 dsl_dataset_t *ds = os->os_dsl_dataset; 1516 zap_cursor_t cursor; 1517 zap_attribute_t attr; 1518 1519 ASSERT(dsl_pool_config_held(dmu_objset_pool(os))); 1520 1521 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1522 return (SET_ERROR(ENOENT)); 1523 1524 zap_cursor_init_serialized(&cursor, 1525 ds->ds_dir->dd_pool->dp_meta_objset, 1526 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp); 1527 1528 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1529 zap_cursor_fini(&cursor); 1530 return (SET_ERROR(ENOENT)); 1531 } 1532 1533 if (strlen(attr.za_name) + 1 > namelen) { 1534 zap_cursor_fini(&cursor); 1535 return (SET_ERROR(ENAMETOOLONG)); 1536 } 1537 1538 (void) strcpy(name, attr.za_name); 1539 if (idp) 1540 *idp = attr.za_first_integer; 1541 if (case_conflict) 1542 *case_conflict = attr.za_normalization_conflict; 1543 zap_cursor_advance(&cursor); 1544 *offp = zap_cursor_serialize(&cursor); 1545 zap_cursor_fini(&cursor); 1546 1547 return (0); 1548 } 1549 1550 int 1551 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1552 uint64_t *idp, uint64_t *offp) 1553 { 1554 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1555 zap_cursor_t cursor; 1556 zap_attribute_t attr; 1557 1558 /* there is no next dir on a snapshot! */ 1559 if (os->os_dsl_dataset->ds_object != 1560 dsl_dir_phys(dd)->dd_head_dataset_obj) 1561 return (SET_ERROR(ENOENT)); 1562 1563 zap_cursor_init_serialized(&cursor, 1564 dd->dd_pool->dp_meta_objset, 1565 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp); 1566 1567 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1568 zap_cursor_fini(&cursor); 1569 return (SET_ERROR(ENOENT)); 1570 } 1571 1572 if (strlen(attr.za_name) + 1 > namelen) { 1573 zap_cursor_fini(&cursor); 1574 return (SET_ERROR(ENAMETOOLONG)); 1575 } 1576 1577 (void) strcpy(name, attr.za_name); 1578 if (idp) 1579 *idp = attr.za_first_integer; 1580 zap_cursor_advance(&cursor); 1581 *offp = zap_cursor_serialize(&cursor); 1582 zap_cursor_fini(&cursor); 1583 1584 return (0); 1585 } 1586 1587 typedef struct dmu_objset_find_ctx { 1588 taskq_t *dc_tq; 1589 dsl_pool_t *dc_dp; 1590 uint64_t dc_ddobj; 1591 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *); 1592 void *dc_arg; 1593 int dc_flags; 1594 kmutex_t *dc_error_lock; 1595 int *dc_error; 1596 } dmu_objset_find_ctx_t; 1597 1598 static void 1599 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp) 1600 { 1601 dsl_pool_t *dp = dcp->dc_dp; 1602 dmu_objset_find_ctx_t *child_dcp; 1603 dsl_dir_t *dd; 1604 dsl_dataset_t *ds; 1605 zap_cursor_t zc; 1606 zap_attribute_t *attr; 1607 uint64_t thisobj; 1608 int err = 0; 1609 1610 /* don't process if there already was an error */ 1611 if (*dcp->dc_error != 0) 1612 goto out; 1613 1614 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd); 1615 if (err != 0) 1616 goto out; 1617 1618 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1619 if (dd->dd_myname[0] == '$') { 1620 dsl_dir_rele(dd, FTAG); 1621 goto out; 1622 } 1623 1624 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1625 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1626 1627 /* 1628 * Iterate over all children. 1629 */ 1630 if (dcp->dc_flags & DS_FIND_CHILDREN) { 1631 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1632 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1633 zap_cursor_retrieve(&zc, attr) == 0; 1634 (void) zap_cursor_advance(&zc)) { 1635 ASSERT3U(attr->za_integer_length, ==, 1636 sizeof (uint64_t)); 1637 ASSERT3U(attr->za_num_integers, ==, 1); 1638 1639 child_dcp = kmem_alloc(sizeof (*child_dcp), KM_SLEEP); 1640 *child_dcp = *dcp; 1641 child_dcp->dc_ddobj = attr->za_first_integer; 1642 if (dcp->dc_tq != NULL) 1643 (void) taskq_dispatch(dcp->dc_tq, 1644 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP); 1645 else 1646 dmu_objset_find_dp_impl(child_dcp); 1647 } 1648 zap_cursor_fini(&zc); 1649 } 1650 1651 /* 1652 * Iterate over all snapshots. 1653 */ 1654 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) { 1655 dsl_dataset_t *ds; 1656 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1657 1658 if (err == 0) { 1659 uint64_t snapobj; 1660 1661 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1662 dsl_dataset_rele(ds, FTAG); 1663 1664 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 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 err = dsl_dataset_hold_obj(dp, 1672 attr->za_first_integer, FTAG, &ds); 1673 if (err != 0) 1674 break; 1675 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1676 dsl_dataset_rele(ds, FTAG); 1677 if (err != 0) 1678 break; 1679 } 1680 zap_cursor_fini(&zc); 1681 } 1682 } 1683 1684 dsl_dir_rele(dd, FTAG); 1685 kmem_free(attr, sizeof (zap_attribute_t)); 1686 1687 if (err != 0) 1688 goto out; 1689 1690 /* 1691 * Apply to self. 1692 */ 1693 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1694 if (err != 0) 1695 goto out; 1696 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1697 dsl_dataset_rele(ds, FTAG); 1698 1699 out: 1700 if (err != 0) { 1701 mutex_enter(dcp->dc_error_lock); 1702 /* only keep first error */ 1703 if (*dcp->dc_error == 0) 1704 *dcp->dc_error = err; 1705 mutex_exit(dcp->dc_error_lock); 1706 } 1707 1708 kmem_free(dcp, sizeof (*dcp)); 1709 } 1710 1711 static void 1712 dmu_objset_find_dp_cb(void *arg) 1713 { 1714 dmu_objset_find_ctx_t *dcp = arg; 1715 dsl_pool_t *dp = dcp->dc_dp; 1716 1717 /* 1718 * We need to get a pool_config_lock here, as there are several 1719 * asssert(pool_config_held) down the stack. Getting a lock via 1720 * dsl_pool_config_enter is risky, as it might be stalled by a 1721 * pending writer. This would deadlock, as the write lock can 1722 * only be granted when our parent thread gives up the lock. 1723 * The _prio interface gives us priority over a pending writer. 1724 */ 1725 dsl_pool_config_enter_prio(dp, FTAG); 1726 1727 dmu_objset_find_dp_impl(dcp); 1728 1729 dsl_pool_config_exit(dp, FTAG); 1730 } 1731 1732 /* 1733 * Find objsets under and including ddobj, call func(ds) on each. 1734 * The order for the enumeration is completely undefined. 1735 * func is called with dsl_pool_config held. 1736 */ 1737 int 1738 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj, 1739 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags) 1740 { 1741 int error = 0; 1742 taskq_t *tq = NULL; 1743 int ntasks; 1744 dmu_objset_find_ctx_t *dcp; 1745 kmutex_t err_lock; 1746 1747 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL); 1748 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP); 1749 dcp->dc_tq = NULL; 1750 dcp->dc_dp = dp; 1751 dcp->dc_ddobj = ddobj; 1752 dcp->dc_func = func; 1753 dcp->dc_arg = arg; 1754 dcp->dc_flags = flags; 1755 dcp->dc_error_lock = &err_lock; 1756 dcp->dc_error = &error; 1757 1758 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) { 1759 /* 1760 * In case a write lock is held we can't make use of 1761 * parallelism, as down the stack of the worker threads 1762 * the lock is asserted via dsl_pool_config_held. 1763 * In case of a read lock this is solved by getting a read 1764 * lock in each worker thread, which isn't possible in case 1765 * of a writer lock. So we fall back to the synchronous path 1766 * here. 1767 * In the future it might be possible to get some magic into 1768 * dsl_pool_config_held in a way that it returns true for 1769 * the worker threads so that a single lock held from this 1770 * thread suffices. For now, stay single threaded. 1771 */ 1772 dmu_objset_find_dp_impl(dcp); 1773 1774 return (error); 1775 } 1776 1777 ntasks = dmu_find_threads; 1778 if (ntasks == 0) 1779 ntasks = vdev_count_leaves(dp->dp_spa) * 4; 1780 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks, 1781 INT_MAX, 0); 1782 if (tq == NULL) { 1783 kmem_free(dcp, sizeof (*dcp)); 1784 return (SET_ERROR(ENOMEM)); 1785 } 1786 dcp->dc_tq = tq; 1787 1788 /* dcp will be freed by task */ 1789 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP); 1790 1791 /* 1792 * PORTING: this code relies on the property of taskq_wait to wait 1793 * until no more tasks are queued and no more tasks are active. As 1794 * we always queue new tasks from within other tasks, task_wait 1795 * reliably waits for the full recursion to finish, even though we 1796 * enqueue new tasks after taskq_wait has been called. 1797 * On platforms other than illumos, taskq_wait may not have this 1798 * property. 1799 */ 1800 taskq_wait(tq); 1801 taskq_destroy(tq); 1802 mutex_destroy(&err_lock); 1803 1804 return (error); 1805 } 1806 1807 /* 1808 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1809 * The dp_config_rwlock must not be held when this is called, and it 1810 * will not be held when the callback is called. 1811 * Therefore this function should only be used when the pool is not changing 1812 * (e.g. in syncing context), or the callback can deal with the possible races. 1813 */ 1814 static int 1815 dmu_objset_find_impl(spa_t *spa, const char *name, 1816 int func(const char *, void *), void *arg, int flags) 1817 { 1818 dsl_dir_t *dd; 1819 dsl_pool_t *dp = spa_get_dsl(spa); 1820 dsl_dataset_t *ds; 1821 zap_cursor_t zc; 1822 zap_attribute_t *attr; 1823 char *child; 1824 uint64_t thisobj; 1825 int err; 1826 1827 dsl_pool_config_enter(dp, FTAG); 1828 1829 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL); 1830 if (err != 0) { 1831 dsl_pool_config_exit(dp, FTAG); 1832 return (err); 1833 } 1834 1835 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1836 if (dd->dd_myname[0] == '$') { 1837 dsl_dir_rele(dd, FTAG); 1838 dsl_pool_config_exit(dp, FTAG); 1839 return (0); 1840 } 1841 1842 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1843 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1844 1845 /* 1846 * Iterate over all children. 1847 */ 1848 if (flags & DS_FIND_CHILDREN) { 1849 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1850 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1851 zap_cursor_retrieve(&zc, attr) == 0; 1852 (void) zap_cursor_advance(&zc)) { 1853 ASSERT3U(attr->za_integer_length, ==, 1854 sizeof (uint64_t)); 1855 ASSERT3U(attr->za_num_integers, ==, 1); 1856 1857 child = kmem_asprintf("%s/%s", name, attr->za_name); 1858 dsl_pool_config_exit(dp, FTAG); 1859 err = dmu_objset_find_impl(spa, child, 1860 func, arg, flags); 1861 dsl_pool_config_enter(dp, FTAG); 1862 strfree(child); 1863 if (err != 0) 1864 break; 1865 } 1866 zap_cursor_fini(&zc); 1867 1868 if (err != 0) { 1869 dsl_dir_rele(dd, FTAG); 1870 dsl_pool_config_exit(dp, FTAG); 1871 kmem_free(attr, sizeof (zap_attribute_t)); 1872 return (err); 1873 } 1874 } 1875 1876 /* 1877 * Iterate over all snapshots. 1878 */ 1879 if (flags & DS_FIND_SNAPSHOTS) { 1880 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1881 1882 if (err == 0) { 1883 uint64_t snapobj; 1884 1885 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1886 dsl_dataset_rele(ds, FTAG); 1887 1888 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1889 zap_cursor_retrieve(&zc, attr) == 0; 1890 (void) zap_cursor_advance(&zc)) { 1891 ASSERT3U(attr->za_integer_length, ==, 1892 sizeof (uint64_t)); 1893 ASSERT3U(attr->za_num_integers, ==, 1); 1894 1895 child = kmem_asprintf("%s@%s", 1896 name, attr->za_name); 1897 dsl_pool_config_exit(dp, FTAG); 1898 err = func(child, arg); 1899 dsl_pool_config_enter(dp, FTAG); 1900 strfree(child); 1901 if (err != 0) 1902 break; 1903 } 1904 zap_cursor_fini(&zc); 1905 } 1906 } 1907 1908 dsl_dir_rele(dd, FTAG); 1909 kmem_free(attr, sizeof (zap_attribute_t)); 1910 dsl_pool_config_exit(dp, FTAG); 1911 1912 if (err != 0) 1913 return (err); 1914 1915 /* Apply to self. */ 1916 return (func(name, arg)); 1917 } 1918 1919 /* 1920 * See comment above dmu_objset_find_impl(). 1921 */ 1922 int 1923 dmu_objset_find(char *name, int func(const char *, void *), void *arg, 1924 int flags) 1925 { 1926 spa_t *spa; 1927 int error; 1928 1929 error = spa_open(name, &spa, FTAG); 1930 if (error != 0) 1931 return (error); 1932 error = dmu_objset_find_impl(spa, name, func, arg, flags); 1933 spa_close(spa, FTAG); 1934 return (error); 1935 } 1936 1937 void 1938 dmu_objset_set_user(objset_t *os, void *user_ptr) 1939 { 1940 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1941 os->os_user_ptr = user_ptr; 1942 } 1943 1944 void * 1945 dmu_objset_get_user(objset_t *os) 1946 { 1947 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1948 return (os->os_user_ptr); 1949 } 1950 1951 /* 1952 * Determine name of filesystem, given name of snapshot. 1953 * buf must be at least MAXNAMELEN bytes 1954 */ 1955 int 1956 dmu_fsname(const char *snapname, char *buf) 1957 { 1958 char *atp = strchr(snapname, '@'); 1959 if (atp == NULL) 1960 return (SET_ERROR(EINVAL)); 1961 if (atp - snapname >= MAXNAMELEN) 1962 return (SET_ERROR(ENAMETOOLONG)); 1963 (void) strlcpy(buf, snapname, atp - snapname + 1); 1964 return (0); 1965 } 1966