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, 2016 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 * Copyright (c) 2014 Integros [integros.com] 30 */ 31 32 /* Portions Copyright 2010 Robert Milkowski */ 33 34 #include <sys/cred.h> 35 #include <sys/zfs_context.h> 36 #include <sys/dmu_objset.h> 37 #include <sys/dsl_dir.h> 38 #include <sys/dsl_dataset.h> 39 #include <sys/dsl_prop.h> 40 #include <sys/dsl_pool.h> 41 #include <sys/dsl_synctask.h> 42 #include <sys/dsl_deleg.h> 43 #include <sys/dnode.h> 44 #include <sys/dbuf.h> 45 #include <sys/zvol.h> 46 #include <sys/dmu_tx.h> 47 #include <sys/zap.h> 48 #include <sys/zil.h> 49 #include <sys/dmu_impl.h> 50 #include <sys/zfs_ioctl.h> 51 #include <sys/sa.h> 52 #include <sys/zfs_onexit.h> 53 #include <sys/dsl_destroy.h> 54 #include <sys/vdev.h> 55 56 /* 57 * Needed to close a window in dnode_move() that allows the objset to be freed 58 * before it can be safely accessed. 59 */ 60 krwlock_t os_lock; 61 62 /* 63 * Tunable to overwrite the maximum number of threads for the parallization 64 * of dmu_objset_find_dp, needed to speed up the import of pools with many 65 * datasets. 66 * Default is 4 times the number of leaf vdevs. 67 */ 68 int dmu_find_threads = 0; 69 70 static void dmu_objset_find_dp_cb(void *arg); 71 72 void 73 dmu_objset_init(void) 74 { 75 rw_init(&os_lock, NULL, RW_DEFAULT, NULL); 76 } 77 78 void 79 dmu_objset_fini(void) 80 { 81 rw_destroy(&os_lock); 82 } 83 84 spa_t * 85 dmu_objset_spa(objset_t *os) 86 { 87 return (os->os_spa); 88 } 89 90 zilog_t * 91 dmu_objset_zil(objset_t *os) 92 { 93 return (os->os_zil); 94 } 95 96 dsl_pool_t * 97 dmu_objset_pool(objset_t *os) 98 { 99 dsl_dataset_t *ds; 100 101 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir) 102 return (ds->ds_dir->dd_pool); 103 else 104 return (spa_get_dsl(os->os_spa)); 105 } 106 107 dsl_dataset_t * 108 dmu_objset_ds(objset_t *os) 109 { 110 return (os->os_dsl_dataset); 111 } 112 113 dmu_objset_type_t 114 dmu_objset_type(objset_t *os) 115 { 116 return (os->os_phys->os_type); 117 } 118 119 void 120 dmu_objset_name(objset_t *os, char *buf) 121 { 122 dsl_dataset_name(os->os_dsl_dataset, buf); 123 } 124 125 uint64_t 126 dmu_objset_id(objset_t *os) 127 { 128 dsl_dataset_t *ds = os->os_dsl_dataset; 129 130 return (ds ? ds->ds_object : 0); 131 } 132 133 zfs_sync_type_t 134 dmu_objset_syncprop(objset_t *os) 135 { 136 return (os->os_sync); 137 } 138 139 zfs_logbias_op_t 140 dmu_objset_logbias(objset_t *os) 141 { 142 return (os->os_logbias); 143 } 144 145 static void 146 checksum_changed_cb(void *arg, uint64_t newval) 147 { 148 objset_t *os = arg; 149 150 /* 151 * Inheritance should have been done by now. 152 */ 153 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 154 155 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 156 } 157 158 static void 159 compression_changed_cb(void *arg, uint64_t newval) 160 { 161 objset_t *os = arg; 162 163 /* 164 * Inheritance and range checking should have been done by now. 165 */ 166 ASSERT(newval != ZIO_COMPRESS_INHERIT); 167 168 os->os_compress = zio_compress_select(os->os_spa, newval, 169 ZIO_COMPRESS_ON); 170 } 171 172 static void 173 copies_changed_cb(void *arg, uint64_t newval) 174 { 175 objset_t *os = arg; 176 177 /* 178 * Inheritance and range checking should have been done by now. 179 */ 180 ASSERT(newval > 0); 181 ASSERT(newval <= spa_max_replication(os->os_spa)); 182 183 os->os_copies = newval; 184 } 185 186 static void 187 dedup_changed_cb(void *arg, uint64_t newval) 188 { 189 objset_t *os = arg; 190 spa_t *spa = os->os_spa; 191 enum zio_checksum checksum; 192 193 /* 194 * Inheritance should have been done by now. 195 */ 196 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 197 198 checksum = zio_checksum_dedup_select(spa, newval, ZIO_CHECKSUM_OFF); 199 200 os->os_dedup_checksum = checksum & ZIO_CHECKSUM_MASK; 201 os->os_dedup_verify = !!(checksum & ZIO_CHECKSUM_VERIFY); 202 } 203 204 static void 205 primary_cache_changed_cb(void *arg, uint64_t newval) 206 { 207 objset_t *os = arg; 208 209 /* 210 * Inheritance and range checking should have been done by now. 211 */ 212 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 213 newval == ZFS_CACHE_METADATA); 214 215 os->os_primary_cache = newval; 216 } 217 218 static void 219 secondary_cache_changed_cb(void *arg, uint64_t newval) 220 { 221 objset_t *os = arg; 222 223 /* 224 * Inheritance and range checking should have been done by now. 225 */ 226 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 227 newval == ZFS_CACHE_METADATA); 228 229 os->os_secondary_cache = newval; 230 } 231 232 static void 233 sync_changed_cb(void *arg, uint64_t newval) 234 { 235 objset_t *os = arg; 236 237 /* 238 * Inheritance and range checking should have been done by now. 239 */ 240 ASSERT(newval == ZFS_SYNC_STANDARD || newval == ZFS_SYNC_ALWAYS || 241 newval == ZFS_SYNC_DISABLED); 242 243 os->os_sync = newval; 244 if (os->os_zil) 245 zil_set_sync(os->os_zil, newval); 246 } 247 248 static void 249 redundant_metadata_changed_cb(void *arg, uint64_t newval) 250 { 251 objset_t *os = arg; 252 253 /* 254 * Inheritance and range checking should have been done by now. 255 */ 256 ASSERT(newval == ZFS_REDUNDANT_METADATA_ALL || 257 newval == ZFS_REDUNDANT_METADATA_MOST); 258 259 os->os_redundant_metadata = newval; 260 } 261 262 static void 263 logbias_changed_cb(void *arg, uint64_t newval) 264 { 265 objset_t *os = arg; 266 267 ASSERT(newval == ZFS_LOGBIAS_LATENCY || 268 newval == ZFS_LOGBIAS_THROUGHPUT); 269 os->os_logbias = newval; 270 if (os->os_zil) 271 zil_set_logbias(os->os_zil, newval); 272 } 273 274 static void 275 recordsize_changed_cb(void *arg, uint64_t newval) 276 { 277 objset_t *os = arg; 278 279 os->os_recordsize = newval; 280 } 281 282 void 283 dmu_objset_byteswap(void *buf, size_t size) 284 { 285 objset_phys_t *osp = buf; 286 287 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t)); 288 dnode_byteswap(&osp->os_meta_dnode); 289 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 290 osp->os_type = BSWAP_64(osp->os_type); 291 osp->os_flags = BSWAP_64(osp->os_flags); 292 if (size == sizeof (objset_phys_t)) { 293 dnode_byteswap(&osp->os_userused_dnode); 294 dnode_byteswap(&osp->os_groupused_dnode); 295 } 296 } 297 298 int 299 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 300 objset_t **osp) 301 { 302 objset_t *os; 303 int i, err; 304 305 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 306 307 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP); 308 os->os_dsl_dataset = ds; 309 os->os_spa = spa; 310 os->os_rootbp = bp; 311 if (!BP_IS_HOLE(os->os_rootbp)) { 312 arc_flags_t aflags = ARC_FLAG_WAIT; 313 zbookmark_phys_t zb; 314 SET_BOOKMARK(&zb, ds ? ds->ds_object : DMU_META_OBJSET, 315 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 316 317 if (DMU_OS_IS_L2CACHEABLE(os)) 318 aflags |= ARC_FLAG_L2CACHE; 319 if (DMU_OS_IS_L2COMPRESSIBLE(os)) 320 aflags |= ARC_FLAG_L2COMPRESS; 321 322 dprintf_bp(os->os_rootbp, "reading %s", ""); 323 err = arc_read(NULL, spa, os->os_rootbp, 324 arc_getbuf_func, &os->os_phys_buf, 325 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 326 if (err != 0) { 327 kmem_free(os, sizeof (objset_t)); 328 /* convert checksum errors into IO errors */ 329 if (err == ECKSUM) 330 err = SET_ERROR(EIO); 331 return (err); 332 } 333 334 /* Increase the blocksize if we are permitted. */ 335 if (spa_version(spa) >= SPA_VERSION_USERSPACE && 336 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) { 337 arc_buf_t *buf = arc_buf_alloc(spa, 338 sizeof (objset_phys_t), &os->os_phys_buf, 339 ARC_BUFC_METADATA); 340 bzero(buf->b_data, sizeof (objset_phys_t)); 341 bcopy(os->os_phys_buf->b_data, buf->b_data, 342 arc_buf_size(os->os_phys_buf)); 343 (void) arc_buf_remove_ref(os->os_phys_buf, 344 &os->os_phys_buf); 345 os->os_phys_buf = buf; 346 } 347 348 os->os_phys = os->os_phys_buf->b_data; 349 os->os_flags = os->os_phys->os_flags; 350 } else { 351 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? 352 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; 353 os->os_phys_buf = arc_buf_alloc(spa, size, 354 &os->os_phys_buf, ARC_BUFC_METADATA); 355 os->os_phys = os->os_phys_buf->b_data; 356 bzero(os->os_phys, size); 357 } 358 359 /* 360 * Note: the changed_cb will be called once before the register 361 * func returns, thus changing the checksum/compression from the 362 * default (fletcher2/off). Snapshots don't need to know about 363 * checksum/compression/copies. 364 */ 365 if (ds != NULL) { 366 boolean_t needlock = B_FALSE; 367 368 /* 369 * Note: it's valid to open the objset if the dataset is 370 * long-held, in which case the pool_config lock will not 371 * be held. 372 */ 373 if (!dsl_pool_config_held(dmu_objset_pool(os))) { 374 needlock = B_TRUE; 375 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 376 } 377 err = dsl_prop_register(ds, 378 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE), 379 primary_cache_changed_cb, os); 380 if (err == 0) { 381 err = dsl_prop_register(ds, 382 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE), 383 secondary_cache_changed_cb, os); 384 } 385 if (!ds->ds_is_snapshot) { 386 if (err == 0) { 387 err = dsl_prop_register(ds, 388 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 389 checksum_changed_cb, os); 390 } 391 if (err == 0) { 392 err = dsl_prop_register(ds, 393 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 394 compression_changed_cb, os); 395 } 396 if (err == 0) { 397 err = dsl_prop_register(ds, 398 zfs_prop_to_name(ZFS_PROP_COPIES), 399 copies_changed_cb, os); 400 } 401 if (err == 0) { 402 err = dsl_prop_register(ds, 403 zfs_prop_to_name(ZFS_PROP_DEDUP), 404 dedup_changed_cb, os); 405 } 406 if (err == 0) { 407 err = dsl_prop_register(ds, 408 zfs_prop_to_name(ZFS_PROP_LOGBIAS), 409 logbias_changed_cb, os); 410 } 411 if (err == 0) { 412 err = dsl_prop_register(ds, 413 zfs_prop_to_name(ZFS_PROP_SYNC), 414 sync_changed_cb, os); 415 } 416 if (err == 0) { 417 err = dsl_prop_register(ds, 418 zfs_prop_to_name( 419 ZFS_PROP_REDUNDANT_METADATA), 420 redundant_metadata_changed_cb, os); 421 } 422 if (err == 0) { 423 err = dsl_prop_register(ds, 424 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 425 recordsize_changed_cb, os); 426 } 427 } 428 if (needlock) 429 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 430 if (err != 0) { 431 VERIFY(arc_buf_remove_ref(os->os_phys_buf, 432 &os->os_phys_buf)); 433 kmem_free(os, sizeof (objset_t)); 434 return (err); 435 } 436 } else { 437 /* It's the meta-objset. */ 438 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 439 os->os_compress = ZIO_COMPRESS_ON; 440 os->os_copies = spa_max_replication(spa); 441 os->os_dedup_checksum = ZIO_CHECKSUM_OFF; 442 os->os_dedup_verify = B_FALSE; 443 os->os_logbias = ZFS_LOGBIAS_LATENCY; 444 os->os_sync = ZFS_SYNC_STANDARD; 445 os->os_primary_cache = ZFS_CACHE_ALL; 446 os->os_secondary_cache = ZFS_CACHE_ALL; 447 } 448 449 if (ds == NULL || !ds->ds_is_snapshot) 450 os->os_zil_header = os->os_phys->os_zil_header; 451 os->os_zil = zil_alloc(os, &os->os_zil_header); 452 453 for (i = 0; i < TXG_SIZE; i++) { 454 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t), 455 offsetof(dnode_t, dn_dirty_link[i])); 456 list_create(&os->os_free_dnodes[i], sizeof (dnode_t), 457 offsetof(dnode_t, dn_dirty_link[i])); 458 } 459 list_create(&os->os_dnodes, sizeof (dnode_t), 460 offsetof(dnode_t, dn_link)); 461 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 462 offsetof(dmu_buf_impl_t, db_link)); 463 464 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); 465 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 466 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 467 468 dnode_special_open(os, &os->os_phys->os_meta_dnode, 469 DMU_META_DNODE_OBJECT, &os->os_meta_dnode); 470 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) { 471 dnode_special_open(os, &os->os_phys->os_userused_dnode, 472 DMU_USERUSED_OBJECT, &os->os_userused_dnode); 473 dnode_special_open(os, &os->os_phys->os_groupused_dnode, 474 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode); 475 } 476 477 *osp = os; 478 return (0); 479 } 480 481 int 482 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) 483 { 484 int err = 0; 485 486 /* 487 * We shouldn't be doing anything with dsl_dataset_t's unless the 488 * pool_config lock is held, or the dataset is long-held. 489 */ 490 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool) || 491 dsl_dataset_long_held(ds)); 492 493 mutex_enter(&ds->ds_opening_lock); 494 if (ds->ds_objset == NULL) { 495 objset_t *os; 496 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 497 ds, dsl_dataset_get_blkptr(ds), &os); 498 499 if (err == 0) { 500 mutex_enter(&ds->ds_lock); 501 ASSERT(ds->ds_objset == NULL); 502 ds->ds_objset = os; 503 mutex_exit(&ds->ds_lock); 504 } 505 } 506 *osp = ds->ds_objset; 507 mutex_exit(&ds->ds_opening_lock); 508 return (err); 509 } 510 511 /* 512 * Holds the pool while the objset is held. Therefore only one objset 513 * can be held at a time. 514 */ 515 int 516 dmu_objset_hold(const char *name, void *tag, objset_t **osp) 517 { 518 dsl_pool_t *dp; 519 dsl_dataset_t *ds; 520 int err; 521 522 err = dsl_pool_hold(name, tag, &dp); 523 if (err != 0) 524 return (err); 525 err = dsl_dataset_hold(dp, name, tag, &ds); 526 if (err != 0) { 527 dsl_pool_rele(dp, tag); 528 return (err); 529 } 530 531 err = dmu_objset_from_ds(ds, osp); 532 if (err != 0) { 533 dsl_dataset_rele(ds, tag); 534 dsl_pool_rele(dp, tag); 535 } 536 537 return (err); 538 } 539 540 static int 541 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type, 542 boolean_t readonly, void *tag, objset_t **osp) 543 { 544 int err; 545 546 err = dmu_objset_from_ds(ds, osp); 547 if (err != 0) { 548 dsl_dataset_disown(ds, tag); 549 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) { 550 dsl_dataset_disown(ds, tag); 551 return (SET_ERROR(EINVAL)); 552 } else if (!readonly && dsl_dataset_is_snapshot(ds)) { 553 dsl_dataset_disown(ds, tag); 554 return (SET_ERROR(EROFS)); 555 } 556 return (err); 557 } 558 559 /* 560 * dsl_pool must not be held when this is called. 561 * Upon successful return, there will be a longhold on the dataset, 562 * and the dsl_pool will not be held. 563 */ 564 int 565 dmu_objset_own(const char *name, dmu_objset_type_t type, 566 boolean_t readonly, void *tag, objset_t **osp) 567 { 568 dsl_pool_t *dp; 569 dsl_dataset_t *ds; 570 int err; 571 572 err = dsl_pool_hold(name, FTAG, &dp); 573 if (err != 0) 574 return (err); 575 err = dsl_dataset_own(dp, name, tag, &ds); 576 if (err != 0) { 577 dsl_pool_rele(dp, FTAG); 578 return (err); 579 } 580 err = dmu_objset_own_impl(ds, type, readonly, tag, osp); 581 dsl_pool_rele(dp, FTAG); 582 583 return (err); 584 } 585 586 int 587 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type, 588 boolean_t readonly, void *tag, objset_t **osp) 589 { 590 dsl_dataset_t *ds; 591 int err; 592 593 err = dsl_dataset_own_obj(dp, obj, tag, &ds); 594 if (err != 0) 595 return (err); 596 597 return (dmu_objset_own_impl(ds, type, readonly, tag, osp)); 598 } 599 600 void 601 dmu_objset_rele(objset_t *os, void *tag) 602 { 603 dsl_pool_t *dp = dmu_objset_pool(os); 604 dsl_dataset_rele(os->os_dsl_dataset, tag); 605 dsl_pool_rele(dp, tag); 606 } 607 608 /* 609 * When we are called, os MUST refer to an objset associated with a dataset 610 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner 611 * == tag. We will then release and reacquire ownership of the dataset while 612 * holding the pool config_rwlock to avoid intervening namespace or ownership 613 * changes may occur. 614 * 615 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to 616 * release the hold on its dataset and acquire a new one on the dataset of the 617 * same name so that it can be partially torn down and reconstructed. 618 */ 619 void 620 dmu_objset_refresh_ownership(objset_t *os, void *tag) 621 { 622 dsl_pool_t *dp; 623 dsl_dataset_t *ds, *newds; 624 char name[ZFS_MAX_DATASET_NAME_LEN]; 625 626 ds = os->os_dsl_dataset; 627 VERIFY3P(ds, !=, NULL); 628 VERIFY3P(ds->ds_owner, ==, tag); 629 VERIFY(dsl_dataset_long_held(ds)); 630 631 dsl_dataset_name(ds, name); 632 dp = dmu_objset_pool(os); 633 dsl_pool_config_enter(dp, FTAG); 634 dmu_objset_disown(os, tag); 635 VERIFY0(dsl_dataset_own(dp, name, tag, &newds)); 636 VERIFY3P(newds, ==, os->os_dsl_dataset); 637 dsl_pool_config_exit(dp, FTAG); 638 } 639 640 void 641 dmu_objset_disown(objset_t *os, void *tag) 642 { 643 dsl_dataset_disown(os->os_dsl_dataset, tag); 644 } 645 646 void 647 dmu_objset_evict_dbufs(objset_t *os) 648 { 649 dnode_t dn_marker; 650 dnode_t *dn; 651 652 mutex_enter(&os->os_lock); 653 dn = list_head(&os->os_dnodes); 654 while (dn != NULL) { 655 /* 656 * Skip dnodes without holds. We have to do this dance 657 * because dnode_add_ref() only works if there is already a 658 * hold. If the dnode has no holds, then it has no dbufs. 659 */ 660 if (dnode_add_ref(dn, FTAG)) { 661 list_insert_after(&os->os_dnodes, dn, &dn_marker); 662 mutex_exit(&os->os_lock); 663 664 dnode_evict_dbufs(dn); 665 dnode_rele(dn, FTAG); 666 667 mutex_enter(&os->os_lock); 668 dn = list_next(&os->os_dnodes, &dn_marker); 669 list_remove(&os->os_dnodes, &dn_marker); 670 } else { 671 dn = list_next(&os->os_dnodes, dn); 672 } 673 } 674 mutex_exit(&os->os_lock); 675 676 if (DMU_USERUSED_DNODE(os) != NULL) { 677 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os)); 678 dnode_evict_dbufs(DMU_USERUSED_DNODE(os)); 679 } 680 dnode_evict_dbufs(DMU_META_DNODE(os)); 681 } 682 683 /* 684 * Objset eviction processing is split into into two pieces. 685 * The first marks the objset as evicting, evicts any dbufs that 686 * have a refcount of zero, and then queues up the objset for the 687 * second phase of eviction. Once os->os_dnodes has been cleared by 688 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed. 689 * The second phase closes the special dnodes, dequeues the objset from 690 * the list of those undergoing eviction, and finally frees the objset. 691 * 692 * NOTE: Due to asynchronous eviction processing (invocation of 693 * dnode_buf_pageout()), it is possible for the meta dnode for the 694 * objset to have no holds even though os->os_dnodes is not empty. 695 */ 696 void 697 dmu_objset_evict(objset_t *os) 698 { 699 dsl_dataset_t *ds = os->os_dsl_dataset; 700 701 for (int t = 0; t < TXG_SIZE; t++) 702 ASSERT(!dmu_objset_is_dirty(os, t)); 703 704 if (ds) 705 dsl_prop_unregister_all(ds, os); 706 707 if (os->os_sa) 708 sa_tear_down(os); 709 710 dmu_objset_evict_dbufs(os); 711 712 mutex_enter(&os->os_lock); 713 spa_evicting_os_register(os->os_spa, os); 714 if (list_is_empty(&os->os_dnodes)) { 715 mutex_exit(&os->os_lock); 716 dmu_objset_evict_done(os); 717 } else { 718 mutex_exit(&os->os_lock); 719 } 720 } 721 722 void 723 dmu_objset_evict_done(objset_t *os) 724 { 725 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 726 727 dnode_special_close(&os->os_meta_dnode); 728 if (DMU_USERUSED_DNODE(os)) { 729 dnode_special_close(&os->os_userused_dnode); 730 dnode_special_close(&os->os_groupused_dnode); 731 } 732 zil_free(os->os_zil); 733 734 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf)); 735 736 /* 737 * This is a barrier to prevent the objset from going away in 738 * dnode_move() until we can safely ensure that the objset is still in 739 * use. We consider the objset valid before the barrier and invalid 740 * after the barrier. 741 */ 742 rw_enter(&os_lock, RW_READER); 743 rw_exit(&os_lock); 744 745 mutex_destroy(&os->os_lock); 746 mutex_destroy(&os->os_obj_lock); 747 mutex_destroy(&os->os_user_ptr_lock); 748 spa_evicting_os_deregister(os->os_spa, os); 749 kmem_free(os, sizeof (objset_t)); 750 } 751 752 timestruc_t 753 dmu_objset_snap_cmtime(objset_t *os) 754 { 755 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); 756 } 757 758 /* called from dsl for meta-objset */ 759 objset_t * 760 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 761 dmu_objset_type_t type, dmu_tx_t *tx) 762 { 763 objset_t *os; 764 dnode_t *mdn; 765 766 ASSERT(dmu_tx_is_syncing(tx)); 767 768 if (ds != NULL) 769 VERIFY0(dmu_objset_from_ds(ds, &os)); 770 else 771 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os)); 772 773 mdn = DMU_META_DNODE(os); 774 775 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 776 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 777 778 /* 779 * We don't want to have to increase the meta-dnode's nlevels 780 * later, because then we could do it in quescing context while 781 * we are also accessing it in open context. 782 * 783 * This precaution is not necessary for the MOS (ds == NULL), 784 * because the MOS is only updated in syncing context. 785 * This is most fortunate: the MOS is the only objset that 786 * needs to be synced multiple times as spa_sync() iterates 787 * to convergence, so minimizing its dn_nlevels matters. 788 */ 789 if (ds != NULL) { 790 int levels = 1; 791 792 /* 793 * Determine the number of levels necessary for the meta-dnode 794 * to contain DN_MAX_OBJECT dnodes. 795 */ 796 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 797 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 798 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 799 levels++; 800 801 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 802 mdn->dn_nlevels = levels; 803 } 804 805 ASSERT(type != DMU_OST_NONE); 806 ASSERT(type != DMU_OST_ANY); 807 ASSERT(type < DMU_OST_NUMTYPES); 808 os->os_phys->os_type = type; 809 if (dmu_objset_userused_enabled(os)) { 810 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 811 os->os_flags = os->os_phys->os_flags; 812 } 813 814 dsl_dataset_dirty(ds, tx); 815 816 return (os); 817 } 818 819 typedef struct dmu_objset_create_arg { 820 const char *doca_name; 821 cred_t *doca_cred; 822 void (*doca_userfunc)(objset_t *os, void *arg, 823 cred_t *cr, dmu_tx_t *tx); 824 void *doca_userarg; 825 dmu_objset_type_t doca_type; 826 uint64_t doca_flags; 827 } dmu_objset_create_arg_t; 828 829 /*ARGSUSED*/ 830 static int 831 dmu_objset_create_check(void *arg, dmu_tx_t *tx) 832 { 833 dmu_objset_create_arg_t *doca = arg; 834 dsl_pool_t *dp = dmu_tx_pool(tx); 835 dsl_dir_t *pdd; 836 const char *tail; 837 int error; 838 839 if (strchr(doca->doca_name, '@') != NULL) 840 return (SET_ERROR(EINVAL)); 841 842 if (strlen(doca->doca_name) >= ZFS_MAX_DATASET_NAME_LEN) 843 return (SET_ERROR(ENAMETOOLONG)); 844 845 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail); 846 if (error != 0) 847 return (error); 848 if (tail == NULL) { 849 dsl_dir_rele(pdd, FTAG); 850 return (SET_ERROR(EEXIST)); 851 } 852 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 853 doca->doca_cred); 854 dsl_dir_rele(pdd, FTAG); 855 856 return (error); 857 } 858 859 static void 860 dmu_objset_create_sync(void *arg, dmu_tx_t *tx) 861 { 862 dmu_objset_create_arg_t *doca = arg; 863 dsl_pool_t *dp = dmu_tx_pool(tx); 864 dsl_dir_t *pdd; 865 const char *tail; 866 dsl_dataset_t *ds; 867 uint64_t obj; 868 blkptr_t *bp; 869 objset_t *os; 870 871 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail)); 872 873 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags, 874 doca->doca_cred, tx); 875 876 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 877 bp = dsl_dataset_get_blkptr(ds); 878 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa, 879 ds, bp, doca->doca_type, tx); 880 881 if (doca->doca_userfunc != NULL) { 882 doca->doca_userfunc(os, doca->doca_userarg, 883 doca->doca_cred, tx); 884 } 885 886 spa_history_log_internal_ds(ds, "create", tx, ""); 887 dsl_dataset_rele(ds, FTAG); 888 dsl_dir_rele(pdd, FTAG); 889 } 890 891 int 892 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 893 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 894 { 895 dmu_objset_create_arg_t doca; 896 897 doca.doca_name = name; 898 doca.doca_cred = CRED(); 899 doca.doca_flags = flags; 900 doca.doca_userfunc = func; 901 doca.doca_userarg = arg; 902 doca.doca_type = type; 903 904 return (dsl_sync_task(name, 905 dmu_objset_create_check, dmu_objset_create_sync, &doca, 906 5, ZFS_SPACE_CHECK_NORMAL)); 907 } 908 909 typedef struct dmu_objset_clone_arg { 910 const char *doca_clone; 911 const char *doca_origin; 912 cred_t *doca_cred; 913 } dmu_objset_clone_arg_t; 914 915 /*ARGSUSED*/ 916 static int 917 dmu_objset_clone_check(void *arg, dmu_tx_t *tx) 918 { 919 dmu_objset_clone_arg_t *doca = arg; 920 dsl_dir_t *pdd; 921 const char *tail; 922 int error; 923 dsl_dataset_t *origin; 924 dsl_pool_t *dp = dmu_tx_pool(tx); 925 926 if (strchr(doca->doca_clone, '@') != NULL) 927 return (SET_ERROR(EINVAL)); 928 929 if (strlen(doca->doca_clone) >= ZFS_MAX_DATASET_NAME_LEN) 930 return (SET_ERROR(ENAMETOOLONG)); 931 932 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail); 933 if (error != 0) 934 return (error); 935 if (tail == NULL) { 936 dsl_dir_rele(pdd, FTAG); 937 return (SET_ERROR(EEXIST)); 938 } 939 940 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 941 doca->doca_cred); 942 if (error != 0) { 943 dsl_dir_rele(pdd, FTAG); 944 return (SET_ERROR(EDQUOT)); 945 } 946 dsl_dir_rele(pdd, FTAG); 947 948 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin); 949 if (error != 0) 950 return (error); 951 952 /* You can only clone snapshots, not the head datasets. */ 953 if (!origin->ds_is_snapshot) { 954 dsl_dataset_rele(origin, FTAG); 955 return (SET_ERROR(EINVAL)); 956 } 957 dsl_dataset_rele(origin, FTAG); 958 959 return (0); 960 } 961 962 static void 963 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx) 964 { 965 dmu_objset_clone_arg_t *doca = arg; 966 dsl_pool_t *dp = dmu_tx_pool(tx); 967 dsl_dir_t *pdd; 968 const char *tail; 969 dsl_dataset_t *origin, *ds; 970 uint64_t obj; 971 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 972 973 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail)); 974 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin)); 975 976 obj = dsl_dataset_create_sync(pdd, tail, origin, 0, 977 doca->doca_cred, tx); 978 979 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 980 dsl_dataset_name(origin, namebuf); 981 spa_history_log_internal_ds(ds, "clone", tx, 982 "origin=%s (%llu)", namebuf, origin->ds_object); 983 dsl_dataset_rele(ds, FTAG); 984 dsl_dataset_rele(origin, FTAG); 985 dsl_dir_rele(pdd, FTAG); 986 } 987 988 int 989 dmu_objset_clone(const char *clone, const char *origin) 990 { 991 dmu_objset_clone_arg_t doca; 992 993 doca.doca_clone = clone; 994 doca.doca_origin = origin; 995 doca.doca_cred = CRED(); 996 997 return (dsl_sync_task(clone, 998 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 999 5, ZFS_SPACE_CHECK_NORMAL)); 1000 } 1001 1002 int 1003 dmu_objset_snapshot_one(const char *fsname, const char *snapname) 1004 { 1005 int err; 1006 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname); 1007 nvlist_t *snaps = fnvlist_alloc(); 1008 1009 fnvlist_add_boolean(snaps, longsnap); 1010 strfree(longsnap); 1011 err = dsl_dataset_snapshot(snaps, NULL, NULL); 1012 fnvlist_free(snaps); 1013 return (err); 1014 } 1015 1016 static void 1017 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) 1018 { 1019 dnode_t *dn; 1020 1021 while (dn = list_head(list)) { 1022 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 1023 ASSERT(dn->dn_dbuf->db_data_pending); 1024 /* 1025 * Initialize dn_zio outside dnode_sync() because the 1026 * meta-dnode needs to set it ouside dnode_sync(). 1027 */ 1028 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 1029 ASSERT(dn->dn_zio); 1030 1031 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 1032 list_remove(list, dn); 1033 1034 if (newlist) { 1035 (void) dnode_add_ref(dn, newlist); 1036 list_insert_tail(newlist, dn); 1037 } 1038 1039 dnode_sync(dn, tx); 1040 } 1041 } 1042 1043 /* ARGSUSED */ 1044 static void 1045 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) 1046 { 1047 blkptr_t *bp = zio->io_bp; 1048 objset_t *os = arg; 1049 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 1050 1051 ASSERT(!BP_IS_EMBEDDED(bp)); 1052 ASSERT3P(bp, ==, os->os_rootbp); 1053 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET); 1054 ASSERT0(BP_GET_LEVEL(bp)); 1055 1056 /* 1057 * Update rootbp fill count: it should be the number of objects 1058 * allocated in the object set (not counting the "special" 1059 * objects that are stored in the objset_phys_t -- the meta 1060 * dnode and user/group accounting objects). 1061 */ 1062 bp->blk_fill = 0; 1063 for (int i = 0; i < dnp->dn_nblkptr; i++) 1064 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]); 1065 } 1066 1067 /* ARGSUSED */ 1068 static void 1069 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) 1070 { 1071 blkptr_t *bp = zio->io_bp; 1072 blkptr_t *bp_orig = &zio->io_bp_orig; 1073 objset_t *os = arg; 1074 1075 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 1076 ASSERT(BP_EQUAL(bp, bp_orig)); 1077 } else { 1078 dsl_dataset_t *ds = os->os_dsl_dataset; 1079 dmu_tx_t *tx = os->os_synctx; 1080 1081 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 1082 dsl_dataset_block_born(ds, bp, tx); 1083 } 1084 } 1085 1086 /* called from dsl */ 1087 void 1088 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 1089 { 1090 int txgoff; 1091 zbookmark_phys_t zb; 1092 zio_prop_t zp; 1093 zio_t *zio; 1094 list_t *list; 1095 list_t *newlist = NULL; 1096 dbuf_dirty_record_t *dr; 1097 1098 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 1099 1100 ASSERT(dmu_tx_is_syncing(tx)); 1101 /* XXX the write_done callback should really give us the tx... */ 1102 os->os_synctx = tx; 1103 1104 if (os->os_dsl_dataset == NULL) { 1105 /* 1106 * This is the MOS. If we have upgraded, 1107 * spa_max_replication() could change, so reset 1108 * os_copies here. 1109 */ 1110 os->os_copies = spa_max_replication(os->os_spa); 1111 } 1112 1113 /* 1114 * Create the root block IO 1115 */ 1116 SET_BOOKMARK(&zb, os->os_dsl_dataset ? 1117 os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1118 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 1119 arc_release(os->os_phys_buf, &os->os_phys_buf); 1120 1121 dmu_write_policy(os, NULL, 0, 0, &zp); 1122 1123 zio = arc_write(pio, os->os_spa, tx->tx_txg, 1124 os->os_rootbp, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), 1125 DMU_OS_IS_L2COMPRESSIBLE(os), &zp, dmu_objset_write_ready, 1126 NULL, dmu_objset_write_done, os, ZIO_PRIORITY_ASYNC_WRITE, 1127 ZIO_FLAG_MUSTSUCCEED, &zb); 1128 1129 /* 1130 * Sync special dnodes - the parent IO for the sync is the root block 1131 */ 1132 DMU_META_DNODE(os)->dn_zio = zio; 1133 dnode_sync(DMU_META_DNODE(os), tx); 1134 1135 os->os_phys->os_flags = os->os_flags; 1136 1137 if (DMU_USERUSED_DNODE(os) && 1138 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { 1139 DMU_USERUSED_DNODE(os)->dn_zio = zio; 1140 dnode_sync(DMU_USERUSED_DNODE(os), tx); 1141 DMU_GROUPUSED_DNODE(os)->dn_zio = zio; 1142 dnode_sync(DMU_GROUPUSED_DNODE(os), tx); 1143 } 1144 1145 txgoff = tx->tx_txg & TXG_MASK; 1146 1147 if (dmu_objset_userused_enabled(os)) { 1148 newlist = &os->os_synced_dnodes; 1149 /* 1150 * We must create the list here because it uses the 1151 * dn_dirty_link[] of this txg. 1152 */ 1153 list_create(newlist, sizeof (dnode_t), 1154 offsetof(dnode_t, dn_dirty_link[txgoff])); 1155 } 1156 1157 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); 1158 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); 1159 1160 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; 1161 while (dr = list_head(list)) { 1162 ASSERT0(dr->dr_dbuf->db_level); 1163 list_remove(list, dr); 1164 if (dr->dr_zio) 1165 zio_nowait(dr->dr_zio); 1166 } 1167 /* 1168 * Free intent log blocks up to this tx. 1169 */ 1170 zil_sync(os->os_zil, tx); 1171 os->os_phys->os_zil_header = os->os_zil_header; 1172 zio_nowait(zio); 1173 } 1174 1175 boolean_t 1176 dmu_objset_is_dirty(objset_t *os, uint64_t txg) 1177 { 1178 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) || 1179 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK])); 1180 } 1181 1182 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1183 1184 void 1185 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1186 { 1187 used_cbs[ost] = cb; 1188 } 1189 1190 boolean_t 1191 dmu_objset_userused_enabled(objset_t *os) 1192 { 1193 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1194 used_cbs[os->os_phys->os_type] != NULL && 1195 DMU_USERUSED_DNODE(os) != NULL); 1196 } 1197 1198 static void 1199 do_userquota_update(objset_t *os, uint64_t used, uint64_t flags, 1200 uint64_t user, uint64_t group, boolean_t subtract, dmu_tx_t *tx) 1201 { 1202 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { 1203 int64_t delta = DNODE_SIZE + used; 1204 if (subtract) 1205 delta = -delta; 1206 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT, 1207 user, delta, tx)); 1208 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT, 1209 group, delta, tx)); 1210 } 1211 } 1212 1213 void 1214 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) 1215 { 1216 dnode_t *dn; 1217 list_t *list = &os->os_synced_dnodes; 1218 1219 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); 1220 1221 while (dn = list_head(list)) { 1222 int flags; 1223 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1224 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1225 dn->dn_phys->dn_flags & 1226 DNODE_FLAG_USERUSED_ACCOUNTED); 1227 1228 /* Allocate the user/groupused objects if necessary. */ 1229 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { 1230 VERIFY(0 == zap_create_claim(os, 1231 DMU_USERUSED_OBJECT, 1232 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1233 VERIFY(0 == zap_create_claim(os, 1234 DMU_GROUPUSED_OBJECT, 1235 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1236 } 1237 1238 /* 1239 * We intentionally modify the zap object even if the 1240 * net delta is zero. Otherwise 1241 * the block of the zap obj could be shared between 1242 * datasets but need to be different between them after 1243 * a bprewrite. 1244 */ 1245 1246 flags = dn->dn_id_flags; 1247 ASSERT(flags); 1248 if (flags & DN_ID_OLD_EXIST) { 1249 do_userquota_update(os, dn->dn_oldused, dn->dn_oldflags, 1250 dn->dn_olduid, dn->dn_oldgid, B_TRUE, tx); 1251 } 1252 if (flags & DN_ID_NEW_EXIST) { 1253 do_userquota_update(os, DN_USED_BYTES(dn->dn_phys), 1254 dn->dn_phys->dn_flags, dn->dn_newuid, 1255 dn->dn_newgid, B_FALSE, tx); 1256 } 1257 1258 mutex_enter(&dn->dn_mtx); 1259 dn->dn_oldused = 0; 1260 dn->dn_oldflags = 0; 1261 if (dn->dn_id_flags & DN_ID_NEW_EXIST) { 1262 dn->dn_olduid = dn->dn_newuid; 1263 dn->dn_oldgid = dn->dn_newgid; 1264 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1265 if (dn->dn_bonuslen == 0) 1266 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1267 else 1268 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1269 } 1270 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); 1271 mutex_exit(&dn->dn_mtx); 1272 1273 list_remove(list, dn); 1274 dnode_rele(dn, list); 1275 } 1276 } 1277 1278 /* 1279 * Returns a pointer to data to find uid/gid from 1280 * 1281 * If a dirty record for transaction group that is syncing can't 1282 * be found then NULL is returned. In the NULL case it is assumed 1283 * the uid/gid aren't changing. 1284 */ 1285 static void * 1286 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) 1287 { 1288 dbuf_dirty_record_t *dr, **drp; 1289 void *data; 1290 1291 if (db->db_dirtycnt == 0) 1292 return (db->db.db_data); /* Nothing is changing */ 1293 1294 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1295 if (dr->dr_txg == tx->tx_txg) 1296 break; 1297 1298 if (dr == NULL) { 1299 data = NULL; 1300 } else { 1301 dnode_t *dn; 1302 1303 DB_DNODE_ENTER(dr->dr_dbuf); 1304 dn = DB_DNODE(dr->dr_dbuf); 1305 1306 if (dn->dn_bonuslen == 0 && 1307 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) 1308 data = dr->dt.dl.dr_data->b_data; 1309 else 1310 data = dr->dt.dl.dr_data; 1311 1312 DB_DNODE_EXIT(dr->dr_dbuf); 1313 } 1314 1315 return (data); 1316 } 1317 1318 void 1319 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) 1320 { 1321 objset_t *os = dn->dn_objset; 1322 void *data = NULL; 1323 dmu_buf_impl_t *db = NULL; 1324 uint64_t *user = NULL; 1325 uint64_t *group = NULL; 1326 int flags = dn->dn_id_flags; 1327 int error; 1328 boolean_t have_spill = B_FALSE; 1329 1330 if (!dmu_objset_userused_enabled(dn->dn_objset)) 1331 return; 1332 1333 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| 1334 DN_ID_CHKED_SPILL))) 1335 return; 1336 1337 if (before && dn->dn_bonuslen != 0) 1338 data = DN_BONUS(dn->dn_phys); 1339 else if (!before && dn->dn_bonuslen != 0) { 1340 if (dn->dn_bonus) { 1341 db = dn->dn_bonus; 1342 mutex_enter(&db->db_mtx); 1343 data = dmu_objset_userquota_find_data(db, tx); 1344 } else { 1345 data = DN_BONUS(dn->dn_phys); 1346 } 1347 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { 1348 int rf = 0; 1349 1350 if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) 1351 rf |= DB_RF_HAVESTRUCT; 1352 error = dmu_spill_hold_by_dnode(dn, 1353 rf | DB_RF_MUST_SUCCEED, 1354 FTAG, (dmu_buf_t **)&db); 1355 ASSERT(error == 0); 1356 mutex_enter(&db->db_mtx); 1357 data = (before) ? db->db.db_data : 1358 dmu_objset_userquota_find_data(db, tx); 1359 have_spill = B_TRUE; 1360 } else { 1361 mutex_enter(&dn->dn_mtx); 1362 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1363 mutex_exit(&dn->dn_mtx); 1364 return; 1365 } 1366 1367 if (before) { 1368 ASSERT(data); 1369 user = &dn->dn_olduid; 1370 group = &dn->dn_oldgid; 1371 } else if (data) { 1372 user = &dn->dn_newuid; 1373 group = &dn->dn_newgid; 1374 } 1375 1376 /* 1377 * Must always call the callback in case the object 1378 * type has changed and that type isn't an object type to track 1379 */ 1380 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, 1381 user, group); 1382 1383 /* 1384 * Preserve existing uid/gid when the callback can't determine 1385 * what the new uid/gid are and the callback returned EEXIST. 1386 * The EEXIST error tells us to just use the existing uid/gid. 1387 * If we don't know what the old values are then just assign 1388 * them to 0, since that is a new file being created. 1389 */ 1390 if (!before && data == NULL && error == EEXIST) { 1391 if (flags & DN_ID_OLD_EXIST) { 1392 dn->dn_newuid = dn->dn_olduid; 1393 dn->dn_newgid = dn->dn_oldgid; 1394 } else { 1395 dn->dn_newuid = 0; 1396 dn->dn_newgid = 0; 1397 } 1398 error = 0; 1399 } 1400 1401 if (db) 1402 mutex_exit(&db->db_mtx); 1403 1404 mutex_enter(&dn->dn_mtx); 1405 if (error == 0 && before) 1406 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1407 if (error == 0 && !before) 1408 dn->dn_id_flags |= DN_ID_NEW_EXIST; 1409 1410 if (have_spill) { 1411 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1412 } else { 1413 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1414 } 1415 mutex_exit(&dn->dn_mtx); 1416 if (have_spill) 1417 dmu_buf_rele((dmu_buf_t *)db, FTAG); 1418 } 1419 1420 boolean_t 1421 dmu_objset_userspace_present(objset_t *os) 1422 { 1423 return (os->os_phys->os_flags & 1424 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1425 } 1426 1427 int 1428 dmu_objset_userspace_upgrade(objset_t *os) 1429 { 1430 uint64_t obj; 1431 int err = 0; 1432 1433 if (dmu_objset_userspace_present(os)) 1434 return (0); 1435 if (!dmu_objset_userused_enabled(os)) 1436 return (SET_ERROR(ENOTSUP)); 1437 if (dmu_objset_is_snapshot(os)) 1438 return (SET_ERROR(EINVAL)); 1439 1440 /* 1441 * We simply need to mark every object dirty, so that it will be 1442 * synced out and now accounted. If this is called 1443 * concurrently, or if we already did some work before crashing, 1444 * that's fine, since we track each object's accounted state 1445 * independently. 1446 */ 1447 1448 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1449 dmu_tx_t *tx; 1450 dmu_buf_t *db; 1451 int objerr; 1452 1453 if (issig(JUSTLOOKING) && issig(FORREAL)) 1454 return (SET_ERROR(EINTR)); 1455 1456 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1457 if (objerr != 0) 1458 continue; 1459 tx = dmu_tx_create(os); 1460 dmu_tx_hold_bonus(tx, obj); 1461 objerr = dmu_tx_assign(tx, TXG_WAIT); 1462 if (objerr != 0) { 1463 dmu_tx_abort(tx); 1464 continue; 1465 } 1466 dmu_buf_will_dirty(db, tx); 1467 dmu_buf_rele(db, FTAG); 1468 dmu_tx_commit(tx); 1469 } 1470 1471 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1472 txg_wait_synced(dmu_objset_pool(os), 0); 1473 return (0); 1474 } 1475 1476 void 1477 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1478 uint64_t *usedobjsp, uint64_t *availobjsp) 1479 { 1480 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 1481 usedobjsp, availobjsp); 1482 } 1483 1484 uint64_t 1485 dmu_objset_fsid_guid(objset_t *os) 1486 { 1487 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 1488 } 1489 1490 void 1491 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1492 { 1493 stat->dds_type = os->os_phys->os_type; 1494 if (os->os_dsl_dataset) 1495 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 1496 } 1497 1498 void 1499 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1500 { 1501 ASSERT(os->os_dsl_dataset || 1502 os->os_phys->os_type == DMU_OST_META); 1503 1504 if (os->os_dsl_dataset != NULL) 1505 dsl_dataset_stats(os->os_dsl_dataset, nv); 1506 1507 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1508 os->os_phys->os_type); 1509 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1510 dmu_objset_userspace_present(os)); 1511 } 1512 1513 int 1514 dmu_objset_is_snapshot(objset_t *os) 1515 { 1516 if (os->os_dsl_dataset != NULL) 1517 return (os->os_dsl_dataset->ds_is_snapshot); 1518 else 1519 return (B_FALSE); 1520 } 1521 1522 int 1523 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1524 boolean_t *conflict) 1525 { 1526 dsl_dataset_t *ds = os->os_dsl_dataset; 1527 uint64_t ignored; 1528 1529 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1530 return (SET_ERROR(ENOENT)); 1531 1532 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1533 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored, 1534 MT_FIRST, real, maxlen, conflict)); 1535 } 1536 1537 int 1538 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1539 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1540 { 1541 dsl_dataset_t *ds = os->os_dsl_dataset; 1542 zap_cursor_t cursor; 1543 zap_attribute_t attr; 1544 1545 ASSERT(dsl_pool_config_held(dmu_objset_pool(os))); 1546 1547 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1548 return (SET_ERROR(ENOENT)); 1549 1550 zap_cursor_init_serialized(&cursor, 1551 ds->ds_dir->dd_pool->dp_meta_objset, 1552 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp); 1553 1554 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1555 zap_cursor_fini(&cursor); 1556 return (SET_ERROR(ENOENT)); 1557 } 1558 1559 if (strlen(attr.za_name) + 1 > namelen) { 1560 zap_cursor_fini(&cursor); 1561 return (SET_ERROR(ENAMETOOLONG)); 1562 } 1563 1564 (void) strcpy(name, attr.za_name); 1565 if (idp) 1566 *idp = attr.za_first_integer; 1567 if (case_conflict) 1568 *case_conflict = attr.za_normalization_conflict; 1569 zap_cursor_advance(&cursor); 1570 *offp = zap_cursor_serialize(&cursor); 1571 zap_cursor_fini(&cursor); 1572 1573 return (0); 1574 } 1575 1576 int 1577 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1578 uint64_t *idp, uint64_t *offp) 1579 { 1580 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1581 zap_cursor_t cursor; 1582 zap_attribute_t attr; 1583 1584 /* there is no next dir on a snapshot! */ 1585 if (os->os_dsl_dataset->ds_object != 1586 dsl_dir_phys(dd)->dd_head_dataset_obj) 1587 return (SET_ERROR(ENOENT)); 1588 1589 zap_cursor_init_serialized(&cursor, 1590 dd->dd_pool->dp_meta_objset, 1591 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp); 1592 1593 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1594 zap_cursor_fini(&cursor); 1595 return (SET_ERROR(ENOENT)); 1596 } 1597 1598 if (strlen(attr.za_name) + 1 > namelen) { 1599 zap_cursor_fini(&cursor); 1600 return (SET_ERROR(ENAMETOOLONG)); 1601 } 1602 1603 (void) strcpy(name, attr.za_name); 1604 if (idp) 1605 *idp = attr.za_first_integer; 1606 zap_cursor_advance(&cursor); 1607 *offp = zap_cursor_serialize(&cursor); 1608 zap_cursor_fini(&cursor); 1609 1610 return (0); 1611 } 1612 1613 typedef struct dmu_objset_find_ctx { 1614 taskq_t *dc_tq; 1615 dsl_pool_t *dc_dp; 1616 uint64_t dc_ddobj; 1617 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *); 1618 void *dc_arg; 1619 int dc_flags; 1620 kmutex_t *dc_error_lock; 1621 int *dc_error; 1622 } dmu_objset_find_ctx_t; 1623 1624 static void 1625 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp) 1626 { 1627 dsl_pool_t *dp = dcp->dc_dp; 1628 dmu_objset_find_ctx_t *child_dcp; 1629 dsl_dir_t *dd; 1630 dsl_dataset_t *ds; 1631 zap_cursor_t zc; 1632 zap_attribute_t *attr; 1633 uint64_t thisobj; 1634 int err = 0; 1635 1636 /* don't process if there already was an error */ 1637 if (*dcp->dc_error != 0) 1638 goto out; 1639 1640 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd); 1641 if (err != 0) 1642 goto out; 1643 1644 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1645 if (dd->dd_myname[0] == '$') { 1646 dsl_dir_rele(dd, FTAG); 1647 goto out; 1648 } 1649 1650 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1651 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1652 1653 /* 1654 * Iterate over all children. 1655 */ 1656 if (dcp->dc_flags & DS_FIND_CHILDREN) { 1657 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1658 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1659 zap_cursor_retrieve(&zc, attr) == 0; 1660 (void) zap_cursor_advance(&zc)) { 1661 ASSERT3U(attr->za_integer_length, ==, 1662 sizeof (uint64_t)); 1663 ASSERT3U(attr->za_num_integers, ==, 1); 1664 1665 child_dcp = kmem_alloc(sizeof (*child_dcp), KM_SLEEP); 1666 *child_dcp = *dcp; 1667 child_dcp->dc_ddobj = attr->za_first_integer; 1668 if (dcp->dc_tq != NULL) 1669 (void) taskq_dispatch(dcp->dc_tq, 1670 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP); 1671 else 1672 dmu_objset_find_dp_impl(child_dcp); 1673 } 1674 zap_cursor_fini(&zc); 1675 } 1676 1677 /* 1678 * Iterate over all snapshots. 1679 */ 1680 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) { 1681 dsl_dataset_t *ds; 1682 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1683 1684 if (err == 0) { 1685 uint64_t snapobj; 1686 1687 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1688 dsl_dataset_rele(ds, FTAG); 1689 1690 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1691 zap_cursor_retrieve(&zc, attr) == 0; 1692 (void) zap_cursor_advance(&zc)) { 1693 ASSERT3U(attr->za_integer_length, ==, 1694 sizeof (uint64_t)); 1695 ASSERT3U(attr->za_num_integers, ==, 1); 1696 1697 err = dsl_dataset_hold_obj(dp, 1698 attr->za_first_integer, FTAG, &ds); 1699 if (err != 0) 1700 break; 1701 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1702 dsl_dataset_rele(ds, FTAG); 1703 if (err != 0) 1704 break; 1705 } 1706 zap_cursor_fini(&zc); 1707 } 1708 } 1709 1710 dsl_dir_rele(dd, FTAG); 1711 kmem_free(attr, sizeof (zap_attribute_t)); 1712 1713 if (err != 0) 1714 goto out; 1715 1716 /* 1717 * Apply to self. 1718 */ 1719 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1720 if (err != 0) 1721 goto out; 1722 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1723 dsl_dataset_rele(ds, FTAG); 1724 1725 out: 1726 if (err != 0) { 1727 mutex_enter(dcp->dc_error_lock); 1728 /* only keep first error */ 1729 if (*dcp->dc_error == 0) 1730 *dcp->dc_error = err; 1731 mutex_exit(dcp->dc_error_lock); 1732 } 1733 1734 kmem_free(dcp, sizeof (*dcp)); 1735 } 1736 1737 static void 1738 dmu_objset_find_dp_cb(void *arg) 1739 { 1740 dmu_objset_find_ctx_t *dcp = arg; 1741 dsl_pool_t *dp = dcp->dc_dp; 1742 1743 /* 1744 * We need to get a pool_config_lock here, as there are several 1745 * asssert(pool_config_held) down the stack. Getting a lock via 1746 * dsl_pool_config_enter is risky, as it might be stalled by a 1747 * pending writer. This would deadlock, as the write lock can 1748 * only be granted when our parent thread gives up the lock. 1749 * The _prio interface gives us priority over a pending writer. 1750 */ 1751 dsl_pool_config_enter_prio(dp, FTAG); 1752 1753 dmu_objset_find_dp_impl(dcp); 1754 1755 dsl_pool_config_exit(dp, FTAG); 1756 } 1757 1758 /* 1759 * Find objsets under and including ddobj, call func(ds) on each. 1760 * The order for the enumeration is completely undefined. 1761 * func is called with dsl_pool_config held. 1762 */ 1763 int 1764 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj, 1765 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags) 1766 { 1767 int error = 0; 1768 taskq_t *tq = NULL; 1769 int ntasks; 1770 dmu_objset_find_ctx_t *dcp; 1771 kmutex_t err_lock; 1772 1773 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL); 1774 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP); 1775 dcp->dc_tq = NULL; 1776 dcp->dc_dp = dp; 1777 dcp->dc_ddobj = ddobj; 1778 dcp->dc_func = func; 1779 dcp->dc_arg = arg; 1780 dcp->dc_flags = flags; 1781 dcp->dc_error_lock = &err_lock; 1782 dcp->dc_error = &error; 1783 1784 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) { 1785 /* 1786 * In case a write lock is held we can't make use of 1787 * parallelism, as down the stack of the worker threads 1788 * the lock is asserted via dsl_pool_config_held. 1789 * In case of a read lock this is solved by getting a read 1790 * lock in each worker thread, which isn't possible in case 1791 * of a writer lock. So we fall back to the synchronous path 1792 * here. 1793 * In the future it might be possible to get some magic into 1794 * dsl_pool_config_held in a way that it returns true for 1795 * the worker threads so that a single lock held from this 1796 * thread suffices. For now, stay single threaded. 1797 */ 1798 dmu_objset_find_dp_impl(dcp); 1799 mutex_destroy(&err_lock); 1800 1801 return (error); 1802 } 1803 1804 ntasks = dmu_find_threads; 1805 if (ntasks == 0) 1806 ntasks = vdev_count_leaves(dp->dp_spa) * 4; 1807 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks, 1808 INT_MAX, 0); 1809 if (tq == NULL) { 1810 kmem_free(dcp, sizeof (*dcp)); 1811 mutex_destroy(&err_lock); 1812 1813 return (SET_ERROR(ENOMEM)); 1814 } 1815 dcp->dc_tq = tq; 1816 1817 /* dcp will be freed by task */ 1818 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP); 1819 1820 /* 1821 * PORTING: this code relies on the property of taskq_wait to wait 1822 * until no more tasks are queued and no more tasks are active. As 1823 * we always queue new tasks from within other tasks, task_wait 1824 * reliably waits for the full recursion to finish, even though we 1825 * enqueue new tasks after taskq_wait has been called. 1826 * On platforms other than illumos, taskq_wait may not have this 1827 * property. 1828 */ 1829 taskq_wait(tq); 1830 taskq_destroy(tq); 1831 mutex_destroy(&err_lock); 1832 1833 return (error); 1834 } 1835 1836 /* 1837 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1838 * The dp_config_rwlock must not be held when this is called, and it 1839 * will not be held when the callback is called. 1840 * Therefore this function should only be used when the pool is not changing 1841 * (e.g. in syncing context), or the callback can deal with the possible races. 1842 */ 1843 static int 1844 dmu_objset_find_impl(spa_t *spa, const char *name, 1845 int func(const char *, void *), void *arg, int flags) 1846 { 1847 dsl_dir_t *dd; 1848 dsl_pool_t *dp = spa_get_dsl(spa); 1849 dsl_dataset_t *ds; 1850 zap_cursor_t zc; 1851 zap_attribute_t *attr; 1852 char *child; 1853 uint64_t thisobj; 1854 int err; 1855 1856 dsl_pool_config_enter(dp, FTAG); 1857 1858 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL); 1859 if (err != 0) { 1860 dsl_pool_config_exit(dp, FTAG); 1861 return (err); 1862 } 1863 1864 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1865 if (dd->dd_myname[0] == '$') { 1866 dsl_dir_rele(dd, FTAG); 1867 dsl_pool_config_exit(dp, FTAG); 1868 return (0); 1869 } 1870 1871 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1872 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1873 1874 /* 1875 * Iterate over all children. 1876 */ 1877 if (flags & DS_FIND_CHILDREN) { 1878 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1879 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1880 zap_cursor_retrieve(&zc, attr) == 0; 1881 (void) zap_cursor_advance(&zc)) { 1882 ASSERT3U(attr->za_integer_length, ==, 1883 sizeof (uint64_t)); 1884 ASSERT3U(attr->za_num_integers, ==, 1); 1885 1886 child = kmem_asprintf("%s/%s", name, attr->za_name); 1887 dsl_pool_config_exit(dp, FTAG); 1888 err = dmu_objset_find_impl(spa, child, 1889 func, arg, flags); 1890 dsl_pool_config_enter(dp, FTAG); 1891 strfree(child); 1892 if (err != 0) 1893 break; 1894 } 1895 zap_cursor_fini(&zc); 1896 1897 if (err != 0) { 1898 dsl_dir_rele(dd, FTAG); 1899 dsl_pool_config_exit(dp, FTAG); 1900 kmem_free(attr, sizeof (zap_attribute_t)); 1901 return (err); 1902 } 1903 } 1904 1905 /* 1906 * Iterate over all snapshots. 1907 */ 1908 if (flags & DS_FIND_SNAPSHOTS) { 1909 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1910 1911 if (err == 0) { 1912 uint64_t snapobj; 1913 1914 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1915 dsl_dataset_rele(ds, FTAG); 1916 1917 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1918 zap_cursor_retrieve(&zc, attr) == 0; 1919 (void) zap_cursor_advance(&zc)) { 1920 ASSERT3U(attr->za_integer_length, ==, 1921 sizeof (uint64_t)); 1922 ASSERT3U(attr->za_num_integers, ==, 1); 1923 1924 child = kmem_asprintf("%s@%s", 1925 name, attr->za_name); 1926 dsl_pool_config_exit(dp, FTAG); 1927 err = func(child, arg); 1928 dsl_pool_config_enter(dp, FTAG); 1929 strfree(child); 1930 if (err != 0) 1931 break; 1932 } 1933 zap_cursor_fini(&zc); 1934 } 1935 } 1936 1937 dsl_dir_rele(dd, FTAG); 1938 kmem_free(attr, sizeof (zap_attribute_t)); 1939 dsl_pool_config_exit(dp, FTAG); 1940 1941 if (err != 0) 1942 return (err); 1943 1944 /* Apply to self. */ 1945 return (func(name, arg)); 1946 } 1947 1948 /* 1949 * See comment above dmu_objset_find_impl(). 1950 */ 1951 int 1952 dmu_objset_find(char *name, int func(const char *, void *), void *arg, 1953 int flags) 1954 { 1955 spa_t *spa; 1956 int error; 1957 1958 error = spa_open(name, &spa, FTAG); 1959 if (error != 0) 1960 return (error); 1961 error = dmu_objset_find_impl(spa, name, func, arg, flags); 1962 spa_close(spa, FTAG); 1963 return (error); 1964 } 1965 1966 void 1967 dmu_objset_set_user(objset_t *os, void *user_ptr) 1968 { 1969 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1970 os->os_user_ptr = user_ptr; 1971 } 1972 1973 void * 1974 dmu_objset_get_user(objset_t *os) 1975 { 1976 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1977 return (os->os_user_ptr); 1978 } 1979 1980 /* 1981 * Determine name of filesystem, given name of snapshot. 1982 * buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes 1983 */ 1984 int 1985 dmu_fsname(const char *snapname, char *buf) 1986 { 1987 char *atp = strchr(snapname, '@'); 1988 if (atp == NULL) 1989 return (SET_ERROR(EINVAL)); 1990 if (atp - snapname >= ZFS_MAX_DATASET_NAME_LEN) 1991 return (SET_ERROR(ENAMETOOLONG)); 1992 (void) strlcpy(buf, snapname, atp - snapname + 1); 1993 return (0); 1994 } 1995