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; 319 320 dprintf_bp(os->os_rootbp, "reading %s", ""); 321 err = arc_read(NULL, spa, os->os_rootbp, 322 arc_getbuf_func, &os->os_phys_buf, 323 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 324 if (err != 0) { 325 kmem_free(os, sizeof (objset_t)); 326 /* convert checksum errors into IO errors */ 327 if (err == ECKSUM) 328 err = SET_ERROR(EIO); 329 return (err); 330 } 331 332 /* Increase the blocksize if we are permitted. */ 333 if (spa_version(spa) >= SPA_VERSION_USERSPACE && 334 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) { 335 arc_buf_t *buf = arc_alloc_buf(spa, 336 sizeof (objset_phys_t), &os->os_phys_buf, 337 ARC_BUFC_METADATA); 338 bzero(buf->b_data, sizeof (objset_phys_t)); 339 bcopy(os->os_phys_buf->b_data, buf->b_data, 340 arc_buf_size(os->os_phys_buf)); 341 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 342 os->os_phys_buf = buf; 343 } 344 345 os->os_phys = os->os_phys_buf->b_data; 346 os->os_flags = os->os_phys->os_flags; 347 } else { 348 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? 349 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; 350 os->os_phys_buf = arc_alloc_buf(spa, size, 351 &os->os_phys_buf, ARC_BUFC_METADATA); 352 os->os_phys = os->os_phys_buf->b_data; 353 bzero(os->os_phys, size); 354 } 355 356 /* 357 * Note: the changed_cb will be called once before the register 358 * func returns, thus changing the checksum/compression from the 359 * default (fletcher2/off). Snapshots don't need to know about 360 * checksum/compression/copies. 361 */ 362 if (ds != NULL) { 363 boolean_t needlock = B_FALSE; 364 365 /* 366 * Note: it's valid to open the objset if the dataset is 367 * long-held, in which case the pool_config lock will not 368 * be held. 369 */ 370 if (!dsl_pool_config_held(dmu_objset_pool(os))) { 371 needlock = B_TRUE; 372 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 373 } 374 err = dsl_prop_register(ds, 375 zfs_prop_to_name(ZFS_PROP_PRIMARYCACHE), 376 primary_cache_changed_cb, os); 377 if (err == 0) { 378 err = dsl_prop_register(ds, 379 zfs_prop_to_name(ZFS_PROP_SECONDARYCACHE), 380 secondary_cache_changed_cb, os); 381 } 382 if (!ds->ds_is_snapshot) { 383 if (err == 0) { 384 err = dsl_prop_register(ds, 385 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 386 checksum_changed_cb, os); 387 } 388 if (err == 0) { 389 err = dsl_prop_register(ds, 390 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 391 compression_changed_cb, os); 392 } 393 if (err == 0) { 394 err = dsl_prop_register(ds, 395 zfs_prop_to_name(ZFS_PROP_COPIES), 396 copies_changed_cb, os); 397 } 398 if (err == 0) { 399 err = dsl_prop_register(ds, 400 zfs_prop_to_name(ZFS_PROP_DEDUP), 401 dedup_changed_cb, os); 402 } 403 if (err == 0) { 404 err = dsl_prop_register(ds, 405 zfs_prop_to_name(ZFS_PROP_LOGBIAS), 406 logbias_changed_cb, os); 407 } 408 if (err == 0) { 409 err = dsl_prop_register(ds, 410 zfs_prop_to_name(ZFS_PROP_SYNC), 411 sync_changed_cb, os); 412 } 413 if (err == 0) { 414 err = dsl_prop_register(ds, 415 zfs_prop_to_name( 416 ZFS_PROP_REDUNDANT_METADATA), 417 redundant_metadata_changed_cb, os); 418 } 419 if (err == 0) { 420 err = dsl_prop_register(ds, 421 zfs_prop_to_name(ZFS_PROP_RECORDSIZE), 422 recordsize_changed_cb, os); 423 } 424 } 425 if (needlock) 426 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 427 if (err != 0) { 428 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 429 kmem_free(os, sizeof (objset_t)); 430 return (err); 431 } 432 } else { 433 /* It's the meta-objset. */ 434 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 435 os->os_compress = ZIO_COMPRESS_ON; 436 os->os_copies = spa_max_replication(spa); 437 os->os_dedup_checksum = ZIO_CHECKSUM_OFF; 438 os->os_dedup_verify = B_FALSE; 439 os->os_logbias = ZFS_LOGBIAS_LATENCY; 440 os->os_sync = ZFS_SYNC_STANDARD; 441 os->os_primary_cache = ZFS_CACHE_ALL; 442 os->os_secondary_cache = ZFS_CACHE_ALL; 443 } 444 445 if (ds == NULL || !ds->ds_is_snapshot) 446 os->os_zil_header = os->os_phys->os_zil_header; 447 os->os_zil = zil_alloc(os, &os->os_zil_header); 448 449 for (i = 0; i < TXG_SIZE; i++) { 450 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t), 451 offsetof(dnode_t, dn_dirty_link[i])); 452 list_create(&os->os_free_dnodes[i], sizeof (dnode_t), 453 offsetof(dnode_t, dn_dirty_link[i])); 454 } 455 list_create(&os->os_dnodes, sizeof (dnode_t), 456 offsetof(dnode_t, dn_link)); 457 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 458 offsetof(dmu_buf_impl_t, db_link)); 459 460 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); 461 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 462 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 463 464 dnode_special_open(os, &os->os_phys->os_meta_dnode, 465 DMU_META_DNODE_OBJECT, &os->os_meta_dnode); 466 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) { 467 dnode_special_open(os, &os->os_phys->os_userused_dnode, 468 DMU_USERUSED_OBJECT, &os->os_userused_dnode); 469 dnode_special_open(os, &os->os_phys->os_groupused_dnode, 470 DMU_GROUPUSED_OBJECT, &os->os_groupused_dnode); 471 } 472 473 *osp = os; 474 return (0); 475 } 476 477 int 478 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) 479 { 480 int err = 0; 481 482 /* 483 * We shouldn't be doing anything with dsl_dataset_t's unless the 484 * pool_config lock is held, or the dataset is long-held. 485 */ 486 ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool) || 487 dsl_dataset_long_held(ds)); 488 489 mutex_enter(&ds->ds_opening_lock); 490 if (ds->ds_objset == NULL) { 491 objset_t *os; 492 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 493 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 494 ds, dsl_dataset_get_blkptr(ds), &os); 495 rrw_exit(&ds->ds_bp_rwlock, FTAG); 496 497 if (err == 0) { 498 mutex_enter(&ds->ds_lock); 499 ASSERT(ds->ds_objset == NULL); 500 ds->ds_objset = os; 501 mutex_exit(&ds->ds_lock); 502 } 503 } 504 *osp = ds->ds_objset; 505 mutex_exit(&ds->ds_opening_lock); 506 return (err); 507 } 508 509 /* 510 * Holds the pool while the objset is held. Therefore only one objset 511 * can be held at a time. 512 */ 513 int 514 dmu_objset_hold(const char *name, void *tag, objset_t **osp) 515 { 516 dsl_pool_t *dp; 517 dsl_dataset_t *ds; 518 int err; 519 520 err = dsl_pool_hold(name, tag, &dp); 521 if (err != 0) 522 return (err); 523 err = dsl_dataset_hold(dp, name, tag, &ds); 524 if (err != 0) { 525 dsl_pool_rele(dp, tag); 526 return (err); 527 } 528 529 err = dmu_objset_from_ds(ds, osp); 530 if (err != 0) { 531 dsl_dataset_rele(ds, tag); 532 dsl_pool_rele(dp, tag); 533 } 534 535 return (err); 536 } 537 538 static int 539 dmu_objset_own_impl(dsl_dataset_t *ds, dmu_objset_type_t type, 540 boolean_t readonly, void *tag, objset_t **osp) 541 { 542 int err; 543 544 err = dmu_objset_from_ds(ds, osp); 545 if (err != 0) { 546 dsl_dataset_disown(ds, tag); 547 } else if (type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) { 548 dsl_dataset_disown(ds, tag); 549 return (SET_ERROR(EINVAL)); 550 } else if (!readonly && dsl_dataset_is_snapshot(ds)) { 551 dsl_dataset_disown(ds, tag); 552 return (SET_ERROR(EROFS)); 553 } 554 return (err); 555 } 556 557 /* 558 * dsl_pool must not be held when this is called. 559 * Upon successful return, there will be a longhold on the dataset, 560 * and the dsl_pool will not be held. 561 */ 562 int 563 dmu_objset_own(const char *name, dmu_objset_type_t type, 564 boolean_t readonly, void *tag, objset_t **osp) 565 { 566 dsl_pool_t *dp; 567 dsl_dataset_t *ds; 568 int err; 569 570 err = dsl_pool_hold(name, FTAG, &dp); 571 if (err != 0) 572 return (err); 573 err = dsl_dataset_own(dp, name, tag, &ds); 574 if (err != 0) { 575 dsl_pool_rele(dp, FTAG); 576 return (err); 577 } 578 err = dmu_objset_own_impl(ds, type, readonly, tag, osp); 579 dsl_pool_rele(dp, FTAG); 580 581 return (err); 582 } 583 584 int 585 dmu_objset_own_obj(dsl_pool_t *dp, uint64_t obj, dmu_objset_type_t type, 586 boolean_t readonly, void *tag, objset_t **osp) 587 { 588 dsl_dataset_t *ds; 589 int err; 590 591 err = dsl_dataset_own_obj(dp, obj, tag, &ds); 592 if (err != 0) 593 return (err); 594 595 return (dmu_objset_own_impl(ds, type, readonly, tag, osp)); 596 } 597 598 void 599 dmu_objset_rele(objset_t *os, void *tag) 600 { 601 dsl_pool_t *dp = dmu_objset_pool(os); 602 dsl_dataset_rele(os->os_dsl_dataset, tag); 603 dsl_pool_rele(dp, tag); 604 } 605 606 /* 607 * When we are called, os MUST refer to an objset associated with a dataset 608 * that is owned by 'tag'; that is, is held and long held by 'tag' and ds_owner 609 * == tag. We will then release and reacquire ownership of the dataset while 610 * holding the pool config_rwlock to avoid intervening namespace or ownership 611 * changes may occur. 612 * 613 * This exists solely to accommodate zfs_ioc_userspace_upgrade()'s desire to 614 * release the hold on its dataset and acquire a new one on the dataset of the 615 * same name so that it can be partially torn down and reconstructed. 616 */ 617 void 618 dmu_objset_refresh_ownership(objset_t *os, void *tag) 619 { 620 dsl_pool_t *dp; 621 dsl_dataset_t *ds, *newds; 622 char name[ZFS_MAX_DATASET_NAME_LEN]; 623 624 ds = os->os_dsl_dataset; 625 VERIFY3P(ds, !=, NULL); 626 VERIFY3P(ds->ds_owner, ==, tag); 627 VERIFY(dsl_dataset_long_held(ds)); 628 629 dsl_dataset_name(ds, name); 630 dp = dmu_objset_pool(os); 631 dsl_pool_config_enter(dp, FTAG); 632 dmu_objset_disown(os, tag); 633 VERIFY0(dsl_dataset_own(dp, name, tag, &newds)); 634 VERIFY3P(newds, ==, os->os_dsl_dataset); 635 dsl_pool_config_exit(dp, FTAG); 636 } 637 638 void 639 dmu_objset_disown(objset_t *os, void *tag) 640 { 641 dsl_dataset_disown(os->os_dsl_dataset, tag); 642 } 643 644 void 645 dmu_objset_evict_dbufs(objset_t *os) 646 { 647 dnode_t dn_marker; 648 dnode_t *dn; 649 650 mutex_enter(&os->os_lock); 651 dn = list_head(&os->os_dnodes); 652 while (dn != NULL) { 653 /* 654 * Skip dnodes without holds. We have to do this dance 655 * because dnode_add_ref() only works if there is already a 656 * hold. If the dnode has no holds, then it has no dbufs. 657 */ 658 if (dnode_add_ref(dn, FTAG)) { 659 list_insert_after(&os->os_dnodes, dn, &dn_marker); 660 mutex_exit(&os->os_lock); 661 662 dnode_evict_dbufs(dn); 663 dnode_rele(dn, FTAG); 664 665 mutex_enter(&os->os_lock); 666 dn = list_next(&os->os_dnodes, &dn_marker); 667 list_remove(&os->os_dnodes, &dn_marker); 668 } else { 669 dn = list_next(&os->os_dnodes, dn); 670 } 671 } 672 mutex_exit(&os->os_lock); 673 674 if (DMU_USERUSED_DNODE(os) != NULL) { 675 dnode_evict_dbufs(DMU_GROUPUSED_DNODE(os)); 676 dnode_evict_dbufs(DMU_USERUSED_DNODE(os)); 677 } 678 dnode_evict_dbufs(DMU_META_DNODE(os)); 679 } 680 681 /* 682 * Objset eviction processing is split into into two pieces. 683 * The first marks the objset as evicting, evicts any dbufs that 684 * have a refcount of zero, and then queues up the objset for the 685 * second phase of eviction. Once os->os_dnodes has been cleared by 686 * dnode_buf_pageout()->dnode_destroy(), the second phase is executed. 687 * The second phase closes the special dnodes, dequeues the objset from 688 * the list of those undergoing eviction, and finally frees the objset. 689 * 690 * NOTE: Due to asynchronous eviction processing (invocation of 691 * dnode_buf_pageout()), it is possible for the meta dnode for the 692 * objset to have no holds even though os->os_dnodes is not empty. 693 */ 694 void 695 dmu_objset_evict(objset_t *os) 696 { 697 dsl_dataset_t *ds = os->os_dsl_dataset; 698 699 for (int t = 0; t < TXG_SIZE; t++) 700 ASSERT(!dmu_objset_is_dirty(os, t)); 701 702 if (ds) 703 dsl_prop_unregister_all(ds, os); 704 705 if (os->os_sa) 706 sa_tear_down(os); 707 708 dmu_objset_evict_dbufs(os); 709 710 mutex_enter(&os->os_lock); 711 spa_evicting_os_register(os->os_spa, os); 712 if (list_is_empty(&os->os_dnodes)) { 713 mutex_exit(&os->os_lock); 714 dmu_objset_evict_done(os); 715 } else { 716 mutex_exit(&os->os_lock); 717 } 718 } 719 720 void 721 dmu_objset_evict_done(objset_t *os) 722 { 723 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 724 725 dnode_special_close(&os->os_meta_dnode); 726 if (DMU_USERUSED_DNODE(os)) { 727 dnode_special_close(&os->os_userused_dnode); 728 dnode_special_close(&os->os_groupused_dnode); 729 } 730 zil_free(os->os_zil); 731 732 arc_buf_destroy(os->os_phys_buf, &os->os_phys_buf); 733 734 /* 735 * This is a barrier to prevent the objset from going away in 736 * dnode_move() until we can safely ensure that the objset is still in 737 * use. We consider the objset valid before the barrier and invalid 738 * after the barrier. 739 */ 740 rw_enter(&os_lock, RW_READER); 741 rw_exit(&os_lock); 742 743 mutex_destroy(&os->os_lock); 744 mutex_destroy(&os->os_obj_lock); 745 mutex_destroy(&os->os_user_ptr_lock); 746 spa_evicting_os_deregister(os->os_spa, os); 747 kmem_free(os, sizeof (objset_t)); 748 } 749 750 timestruc_t 751 dmu_objset_snap_cmtime(objset_t *os) 752 { 753 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); 754 } 755 756 /* called from dsl for meta-objset */ 757 objset_t * 758 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 759 dmu_objset_type_t type, dmu_tx_t *tx) 760 { 761 objset_t *os; 762 dnode_t *mdn; 763 764 ASSERT(dmu_tx_is_syncing(tx)); 765 766 if (ds != NULL) 767 VERIFY0(dmu_objset_from_ds(ds, &os)); 768 else 769 VERIFY0(dmu_objset_open_impl(spa, NULL, bp, &os)); 770 771 mdn = DMU_META_DNODE(os); 772 773 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 774 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 775 776 /* 777 * We don't want to have to increase the meta-dnode's nlevels 778 * later, because then we could do it in quescing context while 779 * we are also accessing it in open context. 780 * 781 * This precaution is not necessary for the MOS (ds == NULL), 782 * because the MOS is only updated in syncing context. 783 * This is most fortunate: the MOS is the only objset that 784 * needs to be synced multiple times as spa_sync() iterates 785 * to convergence, so minimizing its dn_nlevels matters. 786 */ 787 if (ds != NULL) { 788 int levels = 1; 789 790 /* 791 * Determine the number of levels necessary for the meta-dnode 792 * to contain DN_MAX_OBJECT dnodes. Note that in order to 793 * ensure that we do not overflow 64 bits, there has to be 794 * a nlevels that gives us a number of blocks > DN_MAX_OBJECT 795 * but < 2^64. Therefore, 796 * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT) (10) must be 797 * less than (64 - log2(DN_MAX_OBJECT)) (16). 798 */ 799 while ((uint64_t)mdn->dn_nblkptr << 800 (mdn->dn_datablkshift - DNODE_SHIFT + 801 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 802 DN_MAX_OBJECT) 803 levels++; 804 805 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 806 mdn->dn_nlevels = levels; 807 } 808 809 ASSERT(type != DMU_OST_NONE); 810 ASSERT(type != DMU_OST_ANY); 811 ASSERT(type < DMU_OST_NUMTYPES); 812 os->os_phys->os_type = type; 813 if (dmu_objset_userused_enabled(os)) { 814 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 815 os->os_flags = os->os_phys->os_flags; 816 } 817 818 dsl_dataset_dirty(ds, tx); 819 820 return (os); 821 } 822 823 typedef struct dmu_objset_create_arg { 824 const char *doca_name; 825 cred_t *doca_cred; 826 void (*doca_userfunc)(objset_t *os, void *arg, 827 cred_t *cr, dmu_tx_t *tx); 828 void *doca_userarg; 829 dmu_objset_type_t doca_type; 830 uint64_t doca_flags; 831 } dmu_objset_create_arg_t; 832 833 /*ARGSUSED*/ 834 static int 835 dmu_objset_create_check(void *arg, dmu_tx_t *tx) 836 { 837 dmu_objset_create_arg_t *doca = arg; 838 dsl_pool_t *dp = dmu_tx_pool(tx); 839 dsl_dir_t *pdd; 840 const char *tail; 841 int error; 842 843 if (strchr(doca->doca_name, '@') != NULL) 844 return (SET_ERROR(EINVAL)); 845 846 if (strlen(doca->doca_name) >= ZFS_MAX_DATASET_NAME_LEN) 847 return (SET_ERROR(ENAMETOOLONG)); 848 849 error = dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail); 850 if (error != 0) 851 return (error); 852 if (tail == NULL) { 853 dsl_dir_rele(pdd, FTAG); 854 return (SET_ERROR(EEXIST)); 855 } 856 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 857 doca->doca_cred); 858 dsl_dir_rele(pdd, FTAG); 859 860 return (error); 861 } 862 863 static void 864 dmu_objset_create_sync(void *arg, dmu_tx_t *tx) 865 { 866 dmu_objset_create_arg_t *doca = arg; 867 dsl_pool_t *dp = dmu_tx_pool(tx); 868 dsl_dir_t *pdd; 869 const char *tail; 870 dsl_dataset_t *ds; 871 uint64_t obj; 872 blkptr_t *bp; 873 objset_t *os; 874 875 VERIFY0(dsl_dir_hold(dp, doca->doca_name, FTAG, &pdd, &tail)); 876 877 obj = dsl_dataset_create_sync(pdd, tail, NULL, doca->doca_flags, 878 doca->doca_cred, tx); 879 880 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 881 rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG); 882 bp = dsl_dataset_get_blkptr(ds); 883 os = dmu_objset_create_impl(pdd->dd_pool->dp_spa, 884 ds, bp, doca->doca_type, tx); 885 rrw_exit(&ds->ds_bp_rwlock, FTAG); 886 887 if (doca->doca_userfunc != NULL) { 888 doca->doca_userfunc(os, doca->doca_userarg, 889 doca->doca_cred, tx); 890 } 891 892 spa_history_log_internal_ds(ds, "create", tx, ""); 893 dsl_dataset_rele(ds, FTAG); 894 dsl_dir_rele(pdd, FTAG); 895 } 896 897 int 898 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 899 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 900 { 901 dmu_objset_create_arg_t doca; 902 903 doca.doca_name = name; 904 doca.doca_cred = CRED(); 905 doca.doca_flags = flags; 906 doca.doca_userfunc = func; 907 doca.doca_userarg = arg; 908 doca.doca_type = type; 909 910 return (dsl_sync_task(name, 911 dmu_objset_create_check, dmu_objset_create_sync, &doca, 912 5, ZFS_SPACE_CHECK_NORMAL)); 913 } 914 915 typedef struct dmu_objset_clone_arg { 916 const char *doca_clone; 917 const char *doca_origin; 918 cred_t *doca_cred; 919 } dmu_objset_clone_arg_t; 920 921 /*ARGSUSED*/ 922 static int 923 dmu_objset_clone_check(void *arg, dmu_tx_t *tx) 924 { 925 dmu_objset_clone_arg_t *doca = arg; 926 dsl_dir_t *pdd; 927 const char *tail; 928 int error; 929 dsl_dataset_t *origin; 930 dsl_pool_t *dp = dmu_tx_pool(tx); 931 932 if (strchr(doca->doca_clone, '@') != NULL) 933 return (SET_ERROR(EINVAL)); 934 935 if (strlen(doca->doca_clone) >= ZFS_MAX_DATASET_NAME_LEN) 936 return (SET_ERROR(ENAMETOOLONG)); 937 938 error = dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail); 939 if (error != 0) 940 return (error); 941 if (tail == NULL) { 942 dsl_dir_rele(pdd, FTAG); 943 return (SET_ERROR(EEXIST)); 944 } 945 946 error = dsl_fs_ss_limit_check(pdd, 1, ZFS_PROP_FILESYSTEM_LIMIT, NULL, 947 doca->doca_cred); 948 if (error != 0) { 949 dsl_dir_rele(pdd, FTAG); 950 return (SET_ERROR(EDQUOT)); 951 } 952 dsl_dir_rele(pdd, FTAG); 953 954 error = dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin); 955 if (error != 0) 956 return (error); 957 958 /* You can only clone snapshots, not the head datasets. */ 959 if (!origin->ds_is_snapshot) { 960 dsl_dataset_rele(origin, FTAG); 961 return (SET_ERROR(EINVAL)); 962 } 963 dsl_dataset_rele(origin, FTAG); 964 965 return (0); 966 } 967 968 static void 969 dmu_objset_clone_sync(void *arg, dmu_tx_t *tx) 970 { 971 dmu_objset_clone_arg_t *doca = arg; 972 dsl_pool_t *dp = dmu_tx_pool(tx); 973 dsl_dir_t *pdd; 974 const char *tail; 975 dsl_dataset_t *origin, *ds; 976 uint64_t obj; 977 char namebuf[ZFS_MAX_DATASET_NAME_LEN]; 978 979 VERIFY0(dsl_dir_hold(dp, doca->doca_clone, FTAG, &pdd, &tail)); 980 VERIFY0(dsl_dataset_hold(dp, doca->doca_origin, FTAG, &origin)); 981 982 obj = dsl_dataset_create_sync(pdd, tail, origin, 0, 983 doca->doca_cred, tx); 984 985 VERIFY0(dsl_dataset_hold_obj(pdd->dd_pool, obj, FTAG, &ds)); 986 dsl_dataset_name(origin, namebuf); 987 spa_history_log_internal_ds(ds, "clone", tx, 988 "origin=%s (%llu)", namebuf, origin->ds_object); 989 dsl_dataset_rele(ds, FTAG); 990 dsl_dataset_rele(origin, FTAG); 991 dsl_dir_rele(pdd, FTAG); 992 } 993 994 int 995 dmu_objset_clone(const char *clone, const char *origin) 996 { 997 dmu_objset_clone_arg_t doca; 998 999 doca.doca_clone = clone; 1000 doca.doca_origin = origin; 1001 doca.doca_cred = CRED(); 1002 1003 return (dsl_sync_task(clone, 1004 dmu_objset_clone_check, dmu_objset_clone_sync, &doca, 1005 5, ZFS_SPACE_CHECK_NORMAL)); 1006 } 1007 1008 int 1009 dmu_objset_snapshot_one(const char *fsname, const char *snapname) 1010 { 1011 int err; 1012 char *longsnap = kmem_asprintf("%s@%s", fsname, snapname); 1013 nvlist_t *snaps = fnvlist_alloc(); 1014 1015 fnvlist_add_boolean(snaps, longsnap); 1016 strfree(longsnap); 1017 err = dsl_dataset_snapshot(snaps, NULL, NULL); 1018 fnvlist_free(snaps); 1019 return (err); 1020 } 1021 1022 static void 1023 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) 1024 { 1025 dnode_t *dn; 1026 1027 while (dn = list_head(list)) { 1028 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 1029 ASSERT(dn->dn_dbuf->db_data_pending); 1030 /* 1031 * Initialize dn_zio outside dnode_sync() because the 1032 * meta-dnode needs to set it ouside dnode_sync(). 1033 */ 1034 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 1035 ASSERT(dn->dn_zio); 1036 1037 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 1038 list_remove(list, dn); 1039 1040 if (newlist) { 1041 (void) dnode_add_ref(dn, newlist); 1042 list_insert_tail(newlist, dn); 1043 } 1044 1045 dnode_sync(dn, tx); 1046 } 1047 } 1048 1049 /* ARGSUSED */ 1050 static void 1051 dmu_objset_write_ready(zio_t *zio, arc_buf_t *abuf, void *arg) 1052 { 1053 blkptr_t *bp = zio->io_bp; 1054 objset_t *os = arg; 1055 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 1056 1057 ASSERT(!BP_IS_EMBEDDED(bp)); 1058 ASSERT3U(BP_GET_TYPE(bp), ==, DMU_OT_OBJSET); 1059 ASSERT0(BP_GET_LEVEL(bp)); 1060 1061 /* 1062 * Update rootbp fill count: it should be the number of objects 1063 * allocated in the object set (not counting the "special" 1064 * objects that are stored in the objset_phys_t -- the meta 1065 * dnode and user/group accounting objects). 1066 */ 1067 bp->blk_fill = 0; 1068 for (int i = 0; i < dnp->dn_nblkptr; i++) 1069 bp->blk_fill += BP_GET_FILL(&dnp->dn_blkptr[i]); 1070 if (os->os_dsl_dataset != NULL) 1071 rrw_enter(&os->os_dsl_dataset->ds_bp_rwlock, RW_WRITER, FTAG); 1072 *os->os_rootbp = *bp; 1073 if (os->os_dsl_dataset != NULL) 1074 rrw_exit(&os->os_dsl_dataset->ds_bp_rwlock, FTAG); 1075 } 1076 1077 /* ARGSUSED */ 1078 static void 1079 dmu_objset_write_done(zio_t *zio, arc_buf_t *abuf, void *arg) 1080 { 1081 blkptr_t *bp = zio->io_bp; 1082 blkptr_t *bp_orig = &zio->io_bp_orig; 1083 objset_t *os = arg; 1084 1085 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 1086 ASSERT(BP_EQUAL(bp, bp_orig)); 1087 } else { 1088 dsl_dataset_t *ds = os->os_dsl_dataset; 1089 dmu_tx_t *tx = os->os_synctx; 1090 1091 (void) dsl_dataset_block_kill(ds, bp_orig, tx, B_TRUE); 1092 dsl_dataset_block_born(ds, bp, tx); 1093 } 1094 kmem_free(bp, sizeof (*bp)); 1095 } 1096 1097 /* called from dsl */ 1098 void 1099 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 1100 { 1101 int txgoff; 1102 zbookmark_phys_t zb; 1103 zio_prop_t zp; 1104 zio_t *zio; 1105 list_t *list; 1106 list_t *newlist = NULL; 1107 dbuf_dirty_record_t *dr; 1108 blkptr_t *blkptr_copy = kmem_alloc(sizeof (*os->os_rootbp), KM_SLEEP); 1109 *blkptr_copy = *os->os_rootbp; 1110 1111 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 1112 1113 ASSERT(dmu_tx_is_syncing(tx)); 1114 /* XXX the write_done callback should really give us the tx... */ 1115 os->os_synctx = tx; 1116 1117 if (os->os_dsl_dataset == NULL) { 1118 /* 1119 * This is the MOS. If we have upgraded, 1120 * spa_max_replication() could change, so reset 1121 * os_copies here. 1122 */ 1123 os->os_copies = spa_max_replication(os->os_spa); 1124 } 1125 1126 /* 1127 * Create the root block IO 1128 */ 1129 SET_BOOKMARK(&zb, os->os_dsl_dataset ? 1130 os->os_dsl_dataset->ds_object : DMU_META_OBJSET, 1131 ZB_ROOT_OBJECT, ZB_ROOT_LEVEL, ZB_ROOT_BLKID); 1132 arc_release(os->os_phys_buf, &os->os_phys_buf); 1133 1134 dmu_write_policy(os, NULL, 0, 0, &zp); 1135 1136 zio = arc_write(pio, os->os_spa, tx->tx_txg, 1137 blkptr_copy, os->os_phys_buf, DMU_OS_IS_L2CACHEABLE(os), 1138 &zp, dmu_objset_write_ready, NULL, NULL, dmu_objset_write_done, 1139 os, ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 1140 1141 /* 1142 * Sync special dnodes - the parent IO for the sync is the root block 1143 */ 1144 DMU_META_DNODE(os)->dn_zio = zio; 1145 dnode_sync(DMU_META_DNODE(os), tx); 1146 1147 os->os_phys->os_flags = os->os_flags; 1148 1149 if (DMU_USERUSED_DNODE(os) && 1150 DMU_USERUSED_DNODE(os)->dn_type != DMU_OT_NONE) { 1151 DMU_USERUSED_DNODE(os)->dn_zio = zio; 1152 dnode_sync(DMU_USERUSED_DNODE(os), tx); 1153 DMU_GROUPUSED_DNODE(os)->dn_zio = zio; 1154 dnode_sync(DMU_GROUPUSED_DNODE(os), tx); 1155 } 1156 1157 txgoff = tx->tx_txg & TXG_MASK; 1158 1159 if (dmu_objset_userused_enabled(os)) { 1160 newlist = &os->os_synced_dnodes; 1161 /* 1162 * We must create the list here because it uses the 1163 * dn_dirty_link[] of this txg. 1164 */ 1165 list_create(newlist, sizeof (dnode_t), 1166 offsetof(dnode_t, dn_dirty_link[txgoff])); 1167 } 1168 1169 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); 1170 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); 1171 1172 list = &DMU_META_DNODE(os)->dn_dirty_records[txgoff]; 1173 while (dr = list_head(list)) { 1174 ASSERT0(dr->dr_dbuf->db_level); 1175 list_remove(list, dr); 1176 if (dr->dr_zio) 1177 zio_nowait(dr->dr_zio); 1178 } 1179 /* 1180 * Free intent log blocks up to this tx. 1181 */ 1182 zil_sync(os->os_zil, tx); 1183 os->os_phys->os_zil_header = os->os_zil_header; 1184 zio_nowait(zio); 1185 } 1186 1187 boolean_t 1188 dmu_objset_is_dirty(objset_t *os, uint64_t txg) 1189 { 1190 return (!list_is_empty(&os->os_dirty_dnodes[txg & TXG_MASK]) || 1191 !list_is_empty(&os->os_free_dnodes[txg & TXG_MASK])); 1192 } 1193 1194 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1195 1196 void 1197 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1198 { 1199 used_cbs[ost] = cb; 1200 } 1201 1202 boolean_t 1203 dmu_objset_userused_enabled(objset_t *os) 1204 { 1205 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1206 used_cbs[os->os_phys->os_type] != NULL && 1207 DMU_USERUSED_DNODE(os) != NULL); 1208 } 1209 1210 typedef struct userquota_node { 1211 uint64_t uqn_id; 1212 int64_t uqn_delta; 1213 avl_node_t uqn_node; 1214 } userquota_node_t; 1215 1216 typedef struct userquota_cache { 1217 avl_tree_t uqc_user_deltas; 1218 avl_tree_t uqc_group_deltas; 1219 } userquota_cache_t; 1220 1221 static int 1222 userquota_compare(const void *l, const void *r) 1223 { 1224 const userquota_node_t *luqn = l; 1225 const userquota_node_t *ruqn = r; 1226 1227 if (luqn->uqn_id < ruqn->uqn_id) 1228 return (-1); 1229 if (luqn->uqn_id > ruqn->uqn_id) 1230 return (1); 1231 return (0); 1232 } 1233 1234 static void 1235 do_userquota_cacheflush(objset_t *os, userquota_cache_t *cache, dmu_tx_t *tx) 1236 { 1237 void *cookie; 1238 userquota_node_t *uqn; 1239 1240 ASSERT(dmu_tx_is_syncing(tx)); 1241 1242 cookie = NULL; 1243 while ((uqn = avl_destroy_nodes(&cache->uqc_user_deltas, 1244 &cookie)) != NULL) { 1245 VERIFY0(zap_increment_int(os, DMU_USERUSED_OBJECT, 1246 uqn->uqn_id, uqn->uqn_delta, tx)); 1247 kmem_free(uqn, sizeof (*uqn)); 1248 } 1249 avl_destroy(&cache->uqc_user_deltas); 1250 1251 cookie = NULL; 1252 while ((uqn = avl_destroy_nodes(&cache->uqc_group_deltas, 1253 &cookie)) != NULL) { 1254 VERIFY0(zap_increment_int(os, DMU_GROUPUSED_OBJECT, 1255 uqn->uqn_id, uqn->uqn_delta, tx)); 1256 kmem_free(uqn, sizeof (*uqn)); 1257 } 1258 avl_destroy(&cache->uqc_group_deltas); 1259 } 1260 1261 static void 1262 userquota_update_cache(avl_tree_t *avl, uint64_t id, int64_t delta) 1263 { 1264 userquota_node_t search = { .uqn_id = id }; 1265 avl_index_t idx; 1266 1267 userquota_node_t *uqn = avl_find(avl, &search, &idx); 1268 if (uqn == NULL) { 1269 uqn = kmem_zalloc(sizeof (*uqn), KM_SLEEP); 1270 uqn->uqn_id = id; 1271 avl_insert(avl, uqn, idx); 1272 } 1273 uqn->uqn_delta += delta; 1274 } 1275 1276 static void 1277 do_userquota_update(userquota_cache_t *cache, uint64_t used, uint64_t flags, 1278 uint64_t user, uint64_t group, boolean_t subtract) 1279 { 1280 if ((flags & DNODE_FLAG_USERUSED_ACCOUNTED)) { 1281 int64_t delta = DNODE_SIZE + used; 1282 if (subtract) 1283 delta = -delta; 1284 1285 userquota_update_cache(&cache->uqc_user_deltas, user, delta); 1286 userquota_update_cache(&cache->uqc_group_deltas, group, delta); 1287 } 1288 } 1289 1290 void 1291 dmu_objset_do_userquota_updates(objset_t *os, dmu_tx_t *tx) 1292 { 1293 dnode_t *dn; 1294 list_t *list = &os->os_synced_dnodes; 1295 userquota_cache_t cache = { 0 }; 1296 1297 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); 1298 1299 avl_create(&cache.uqc_user_deltas, userquota_compare, 1300 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node)); 1301 avl_create(&cache.uqc_group_deltas, userquota_compare, 1302 sizeof (userquota_node_t), offsetof(userquota_node_t, uqn_node)); 1303 1304 while (dn = list_head(list)) { 1305 int flags; 1306 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1307 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1308 dn->dn_phys->dn_flags & 1309 DNODE_FLAG_USERUSED_ACCOUNTED); 1310 1311 /* Allocate the user/groupused objects if necessary. */ 1312 if (DMU_USERUSED_DNODE(os)->dn_type == DMU_OT_NONE) { 1313 VERIFY0(zap_create_claim(os, 1314 DMU_USERUSED_OBJECT, 1315 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1316 VERIFY0(zap_create_claim(os, 1317 DMU_GROUPUSED_OBJECT, 1318 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1319 } 1320 1321 flags = dn->dn_id_flags; 1322 ASSERT(flags); 1323 if (flags & DN_ID_OLD_EXIST) { 1324 do_userquota_update(&cache, 1325 dn->dn_oldused, dn->dn_oldflags, 1326 dn->dn_olduid, dn->dn_oldgid, B_TRUE); 1327 } 1328 if (flags & DN_ID_NEW_EXIST) { 1329 do_userquota_update(&cache, 1330 DN_USED_BYTES(dn->dn_phys), 1331 dn->dn_phys->dn_flags, dn->dn_newuid, 1332 dn->dn_newgid, B_FALSE); 1333 } 1334 1335 mutex_enter(&dn->dn_mtx); 1336 dn->dn_oldused = 0; 1337 dn->dn_oldflags = 0; 1338 if (dn->dn_id_flags & DN_ID_NEW_EXIST) { 1339 dn->dn_olduid = dn->dn_newuid; 1340 dn->dn_oldgid = dn->dn_newgid; 1341 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1342 if (dn->dn_bonuslen == 0) 1343 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1344 else 1345 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1346 } 1347 dn->dn_id_flags &= ~(DN_ID_NEW_EXIST); 1348 mutex_exit(&dn->dn_mtx); 1349 1350 list_remove(list, dn); 1351 dnode_rele(dn, list); 1352 } 1353 do_userquota_cacheflush(os, &cache, tx); 1354 } 1355 1356 /* 1357 * Returns a pointer to data to find uid/gid from 1358 * 1359 * If a dirty record for transaction group that is syncing can't 1360 * be found then NULL is returned. In the NULL case it is assumed 1361 * the uid/gid aren't changing. 1362 */ 1363 static void * 1364 dmu_objset_userquota_find_data(dmu_buf_impl_t *db, dmu_tx_t *tx) 1365 { 1366 dbuf_dirty_record_t *dr, **drp; 1367 void *data; 1368 1369 if (db->db_dirtycnt == 0) 1370 return (db->db.db_data); /* Nothing is changing */ 1371 1372 for (drp = &db->db_last_dirty; (dr = *drp) != NULL; drp = &dr->dr_next) 1373 if (dr->dr_txg == tx->tx_txg) 1374 break; 1375 1376 if (dr == NULL) { 1377 data = NULL; 1378 } else { 1379 dnode_t *dn; 1380 1381 DB_DNODE_ENTER(dr->dr_dbuf); 1382 dn = DB_DNODE(dr->dr_dbuf); 1383 1384 if (dn->dn_bonuslen == 0 && 1385 dr->dr_dbuf->db_blkid == DMU_SPILL_BLKID) 1386 data = dr->dt.dl.dr_data->b_data; 1387 else 1388 data = dr->dt.dl.dr_data; 1389 1390 DB_DNODE_EXIT(dr->dr_dbuf); 1391 } 1392 1393 return (data); 1394 } 1395 1396 void 1397 dmu_objset_userquota_get_ids(dnode_t *dn, boolean_t before, dmu_tx_t *tx) 1398 { 1399 objset_t *os = dn->dn_objset; 1400 void *data = NULL; 1401 dmu_buf_impl_t *db = NULL; 1402 uint64_t *user = NULL; 1403 uint64_t *group = NULL; 1404 int flags = dn->dn_id_flags; 1405 int error; 1406 boolean_t have_spill = B_FALSE; 1407 1408 if (!dmu_objset_userused_enabled(dn->dn_objset)) 1409 return; 1410 1411 if (before && (flags & (DN_ID_CHKED_BONUS|DN_ID_OLD_EXIST| 1412 DN_ID_CHKED_SPILL))) 1413 return; 1414 1415 if (before && dn->dn_bonuslen != 0) 1416 data = DN_BONUS(dn->dn_phys); 1417 else if (!before && dn->dn_bonuslen != 0) { 1418 if (dn->dn_bonus) { 1419 db = dn->dn_bonus; 1420 mutex_enter(&db->db_mtx); 1421 data = dmu_objset_userquota_find_data(db, tx); 1422 } else { 1423 data = DN_BONUS(dn->dn_phys); 1424 } 1425 } else if (dn->dn_bonuslen == 0 && dn->dn_bonustype == DMU_OT_SA) { 1426 int rf = 0; 1427 1428 if (RW_WRITE_HELD(&dn->dn_struct_rwlock)) 1429 rf |= DB_RF_HAVESTRUCT; 1430 error = dmu_spill_hold_by_dnode(dn, 1431 rf | DB_RF_MUST_SUCCEED, 1432 FTAG, (dmu_buf_t **)&db); 1433 ASSERT(error == 0); 1434 mutex_enter(&db->db_mtx); 1435 data = (before) ? db->db.db_data : 1436 dmu_objset_userquota_find_data(db, tx); 1437 have_spill = B_TRUE; 1438 } else { 1439 mutex_enter(&dn->dn_mtx); 1440 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1441 mutex_exit(&dn->dn_mtx); 1442 return; 1443 } 1444 1445 if (before) { 1446 ASSERT(data); 1447 user = &dn->dn_olduid; 1448 group = &dn->dn_oldgid; 1449 } else if (data) { 1450 user = &dn->dn_newuid; 1451 group = &dn->dn_newgid; 1452 } 1453 1454 /* 1455 * Must always call the callback in case the object 1456 * type has changed and that type isn't an object type to track 1457 */ 1458 error = used_cbs[os->os_phys->os_type](dn->dn_bonustype, data, 1459 user, group); 1460 1461 /* 1462 * Preserve existing uid/gid when the callback can't determine 1463 * what the new uid/gid are and the callback returned EEXIST. 1464 * The EEXIST error tells us to just use the existing uid/gid. 1465 * If we don't know what the old values are then just assign 1466 * them to 0, since that is a new file being created. 1467 */ 1468 if (!before && data == NULL && error == EEXIST) { 1469 if (flags & DN_ID_OLD_EXIST) { 1470 dn->dn_newuid = dn->dn_olduid; 1471 dn->dn_newgid = dn->dn_oldgid; 1472 } else { 1473 dn->dn_newuid = 0; 1474 dn->dn_newgid = 0; 1475 } 1476 error = 0; 1477 } 1478 1479 if (db) 1480 mutex_exit(&db->db_mtx); 1481 1482 mutex_enter(&dn->dn_mtx); 1483 if (error == 0 && before) 1484 dn->dn_id_flags |= DN_ID_OLD_EXIST; 1485 if (error == 0 && !before) 1486 dn->dn_id_flags |= DN_ID_NEW_EXIST; 1487 1488 if (have_spill) { 1489 dn->dn_id_flags |= DN_ID_CHKED_SPILL; 1490 } else { 1491 dn->dn_id_flags |= DN_ID_CHKED_BONUS; 1492 } 1493 mutex_exit(&dn->dn_mtx); 1494 if (have_spill) 1495 dmu_buf_rele((dmu_buf_t *)db, FTAG); 1496 } 1497 1498 boolean_t 1499 dmu_objset_userspace_present(objset_t *os) 1500 { 1501 return (os->os_phys->os_flags & 1502 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1503 } 1504 1505 int 1506 dmu_objset_userspace_upgrade(objset_t *os) 1507 { 1508 uint64_t obj; 1509 int err = 0; 1510 1511 if (dmu_objset_userspace_present(os)) 1512 return (0); 1513 if (!dmu_objset_userused_enabled(os)) 1514 return (SET_ERROR(ENOTSUP)); 1515 if (dmu_objset_is_snapshot(os)) 1516 return (SET_ERROR(EINVAL)); 1517 1518 /* 1519 * We simply need to mark every object dirty, so that it will be 1520 * synced out and now accounted. If this is called 1521 * concurrently, or if we already did some work before crashing, 1522 * that's fine, since we track each object's accounted state 1523 * independently. 1524 */ 1525 1526 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1527 dmu_tx_t *tx; 1528 dmu_buf_t *db; 1529 int objerr; 1530 1531 if (issig(JUSTLOOKING) && issig(FORREAL)) 1532 return (SET_ERROR(EINTR)); 1533 1534 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1535 if (objerr != 0) 1536 continue; 1537 tx = dmu_tx_create(os); 1538 dmu_tx_hold_bonus(tx, obj); 1539 objerr = dmu_tx_assign(tx, TXG_WAIT); 1540 if (objerr != 0) { 1541 dmu_tx_abort(tx); 1542 continue; 1543 } 1544 dmu_buf_will_dirty(db, tx); 1545 dmu_buf_rele(db, FTAG); 1546 dmu_tx_commit(tx); 1547 } 1548 1549 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1550 txg_wait_synced(dmu_objset_pool(os), 0); 1551 return (0); 1552 } 1553 1554 void 1555 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1556 uint64_t *usedobjsp, uint64_t *availobjsp) 1557 { 1558 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 1559 usedobjsp, availobjsp); 1560 } 1561 1562 uint64_t 1563 dmu_objset_fsid_guid(objset_t *os) 1564 { 1565 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 1566 } 1567 1568 void 1569 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1570 { 1571 stat->dds_type = os->os_phys->os_type; 1572 if (os->os_dsl_dataset) 1573 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 1574 } 1575 1576 void 1577 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1578 { 1579 ASSERT(os->os_dsl_dataset || 1580 os->os_phys->os_type == DMU_OST_META); 1581 1582 if (os->os_dsl_dataset != NULL) 1583 dsl_dataset_stats(os->os_dsl_dataset, nv); 1584 1585 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1586 os->os_phys->os_type); 1587 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1588 dmu_objset_userspace_present(os)); 1589 } 1590 1591 int 1592 dmu_objset_is_snapshot(objset_t *os) 1593 { 1594 if (os->os_dsl_dataset != NULL) 1595 return (os->os_dsl_dataset->ds_is_snapshot); 1596 else 1597 return (B_FALSE); 1598 } 1599 1600 int 1601 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1602 boolean_t *conflict) 1603 { 1604 dsl_dataset_t *ds = os->os_dsl_dataset; 1605 uint64_t ignored; 1606 1607 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1608 return (SET_ERROR(ENOENT)); 1609 1610 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1611 dsl_dataset_phys(ds)->ds_snapnames_zapobj, name, 8, 1, &ignored, 1612 MT_FIRST, real, maxlen, conflict)); 1613 } 1614 1615 int 1616 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1617 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1618 { 1619 dsl_dataset_t *ds = os->os_dsl_dataset; 1620 zap_cursor_t cursor; 1621 zap_attribute_t attr; 1622 1623 ASSERT(dsl_pool_config_held(dmu_objset_pool(os))); 1624 1625 if (dsl_dataset_phys(ds)->ds_snapnames_zapobj == 0) 1626 return (SET_ERROR(ENOENT)); 1627 1628 zap_cursor_init_serialized(&cursor, 1629 ds->ds_dir->dd_pool->dp_meta_objset, 1630 dsl_dataset_phys(ds)->ds_snapnames_zapobj, *offp); 1631 1632 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1633 zap_cursor_fini(&cursor); 1634 return (SET_ERROR(ENOENT)); 1635 } 1636 1637 if (strlen(attr.za_name) + 1 > namelen) { 1638 zap_cursor_fini(&cursor); 1639 return (SET_ERROR(ENAMETOOLONG)); 1640 } 1641 1642 (void) strcpy(name, attr.za_name); 1643 if (idp) 1644 *idp = attr.za_first_integer; 1645 if (case_conflict) 1646 *case_conflict = attr.za_normalization_conflict; 1647 zap_cursor_advance(&cursor); 1648 *offp = zap_cursor_serialize(&cursor); 1649 zap_cursor_fini(&cursor); 1650 1651 return (0); 1652 } 1653 1654 int 1655 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1656 uint64_t *idp, uint64_t *offp) 1657 { 1658 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1659 zap_cursor_t cursor; 1660 zap_attribute_t attr; 1661 1662 /* there is no next dir on a snapshot! */ 1663 if (os->os_dsl_dataset->ds_object != 1664 dsl_dir_phys(dd)->dd_head_dataset_obj) 1665 return (SET_ERROR(ENOENT)); 1666 1667 zap_cursor_init_serialized(&cursor, 1668 dd->dd_pool->dp_meta_objset, 1669 dsl_dir_phys(dd)->dd_child_dir_zapobj, *offp); 1670 1671 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1672 zap_cursor_fini(&cursor); 1673 return (SET_ERROR(ENOENT)); 1674 } 1675 1676 if (strlen(attr.za_name) + 1 > namelen) { 1677 zap_cursor_fini(&cursor); 1678 return (SET_ERROR(ENAMETOOLONG)); 1679 } 1680 1681 (void) strcpy(name, attr.za_name); 1682 if (idp) 1683 *idp = attr.za_first_integer; 1684 zap_cursor_advance(&cursor); 1685 *offp = zap_cursor_serialize(&cursor); 1686 zap_cursor_fini(&cursor); 1687 1688 return (0); 1689 } 1690 1691 typedef struct dmu_objset_find_ctx { 1692 taskq_t *dc_tq; 1693 dsl_pool_t *dc_dp; 1694 uint64_t dc_ddobj; 1695 int (*dc_func)(dsl_pool_t *, dsl_dataset_t *, void *); 1696 void *dc_arg; 1697 int dc_flags; 1698 kmutex_t *dc_error_lock; 1699 int *dc_error; 1700 } dmu_objset_find_ctx_t; 1701 1702 static void 1703 dmu_objset_find_dp_impl(dmu_objset_find_ctx_t *dcp) 1704 { 1705 dsl_pool_t *dp = dcp->dc_dp; 1706 dmu_objset_find_ctx_t *child_dcp; 1707 dsl_dir_t *dd; 1708 dsl_dataset_t *ds; 1709 zap_cursor_t zc; 1710 zap_attribute_t *attr; 1711 uint64_t thisobj; 1712 int err = 0; 1713 1714 /* don't process if there already was an error */ 1715 if (*dcp->dc_error != 0) 1716 goto out; 1717 1718 err = dsl_dir_hold_obj(dp, dcp->dc_ddobj, NULL, FTAG, &dd); 1719 if (err != 0) 1720 goto out; 1721 1722 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1723 if (dd->dd_myname[0] == '$') { 1724 dsl_dir_rele(dd, FTAG); 1725 goto out; 1726 } 1727 1728 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1729 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1730 1731 /* 1732 * Iterate over all children. 1733 */ 1734 if (dcp->dc_flags & DS_FIND_CHILDREN) { 1735 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1736 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1737 zap_cursor_retrieve(&zc, attr) == 0; 1738 (void) zap_cursor_advance(&zc)) { 1739 ASSERT3U(attr->za_integer_length, ==, 1740 sizeof (uint64_t)); 1741 ASSERT3U(attr->za_num_integers, ==, 1); 1742 1743 child_dcp = kmem_alloc(sizeof (*child_dcp), KM_SLEEP); 1744 *child_dcp = *dcp; 1745 child_dcp->dc_ddobj = attr->za_first_integer; 1746 if (dcp->dc_tq != NULL) 1747 (void) taskq_dispatch(dcp->dc_tq, 1748 dmu_objset_find_dp_cb, child_dcp, TQ_SLEEP); 1749 else 1750 dmu_objset_find_dp_impl(child_dcp); 1751 } 1752 zap_cursor_fini(&zc); 1753 } 1754 1755 /* 1756 * Iterate over all snapshots. 1757 */ 1758 if (dcp->dc_flags & DS_FIND_SNAPSHOTS) { 1759 dsl_dataset_t *ds; 1760 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1761 1762 if (err == 0) { 1763 uint64_t snapobj; 1764 1765 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1766 dsl_dataset_rele(ds, FTAG); 1767 1768 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1769 zap_cursor_retrieve(&zc, attr) == 0; 1770 (void) zap_cursor_advance(&zc)) { 1771 ASSERT3U(attr->za_integer_length, ==, 1772 sizeof (uint64_t)); 1773 ASSERT3U(attr->za_num_integers, ==, 1); 1774 1775 err = dsl_dataset_hold_obj(dp, 1776 attr->za_first_integer, FTAG, &ds); 1777 if (err != 0) 1778 break; 1779 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1780 dsl_dataset_rele(ds, FTAG); 1781 if (err != 0) 1782 break; 1783 } 1784 zap_cursor_fini(&zc); 1785 } 1786 } 1787 1788 dsl_dir_rele(dd, FTAG); 1789 kmem_free(attr, sizeof (zap_attribute_t)); 1790 1791 if (err != 0) 1792 goto out; 1793 1794 /* 1795 * Apply to self. 1796 */ 1797 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1798 if (err != 0) 1799 goto out; 1800 err = dcp->dc_func(dp, ds, dcp->dc_arg); 1801 dsl_dataset_rele(ds, FTAG); 1802 1803 out: 1804 if (err != 0) { 1805 mutex_enter(dcp->dc_error_lock); 1806 /* only keep first error */ 1807 if (*dcp->dc_error == 0) 1808 *dcp->dc_error = err; 1809 mutex_exit(dcp->dc_error_lock); 1810 } 1811 1812 kmem_free(dcp, sizeof (*dcp)); 1813 } 1814 1815 static void 1816 dmu_objset_find_dp_cb(void *arg) 1817 { 1818 dmu_objset_find_ctx_t *dcp = arg; 1819 dsl_pool_t *dp = dcp->dc_dp; 1820 1821 /* 1822 * We need to get a pool_config_lock here, as there are several 1823 * asssert(pool_config_held) down the stack. Getting a lock via 1824 * dsl_pool_config_enter is risky, as it might be stalled by a 1825 * pending writer. This would deadlock, as the write lock can 1826 * only be granted when our parent thread gives up the lock. 1827 * The _prio interface gives us priority over a pending writer. 1828 */ 1829 dsl_pool_config_enter_prio(dp, FTAG); 1830 1831 dmu_objset_find_dp_impl(dcp); 1832 1833 dsl_pool_config_exit(dp, FTAG); 1834 } 1835 1836 /* 1837 * Find objsets under and including ddobj, call func(ds) on each. 1838 * The order for the enumeration is completely undefined. 1839 * func is called with dsl_pool_config held. 1840 */ 1841 int 1842 dmu_objset_find_dp(dsl_pool_t *dp, uint64_t ddobj, 1843 int func(dsl_pool_t *, dsl_dataset_t *, void *), void *arg, int flags) 1844 { 1845 int error = 0; 1846 taskq_t *tq = NULL; 1847 int ntasks; 1848 dmu_objset_find_ctx_t *dcp; 1849 kmutex_t err_lock; 1850 1851 mutex_init(&err_lock, NULL, MUTEX_DEFAULT, NULL); 1852 dcp = kmem_alloc(sizeof (*dcp), KM_SLEEP); 1853 dcp->dc_tq = NULL; 1854 dcp->dc_dp = dp; 1855 dcp->dc_ddobj = ddobj; 1856 dcp->dc_func = func; 1857 dcp->dc_arg = arg; 1858 dcp->dc_flags = flags; 1859 dcp->dc_error_lock = &err_lock; 1860 dcp->dc_error = &error; 1861 1862 if ((flags & DS_FIND_SERIALIZE) || dsl_pool_config_held_writer(dp)) { 1863 /* 1864 * In case a write lock is held we can't make use of 1865 * parallelism, as down the stack of the worker threads 1866 * the lock is asserted via dsl_pool_config_held. 1867 * In case of a read lock this is solved by getting a read 1868 * lock in each worker thread, which isn't possible in case 1869 * of a writer lock. So we fall back to the synchronous path 1870 * here. 1871 * In the future it might be possible to get some magic into 1872 * dsl_pool_config_held in a way that it returns true for 1873 * the worker threads so that a single lock held from this 1874 * thread suffices. For now, stay single threaded. 1875 */ 1876 dmu_objset_find_dp_impl(dcp); 1877 mutex_destroy(&err_lock); 1878 1879 return (error); 1880 } 1881 1882 ntasks = dmu_find_threads; 1883 if (ntasks == 0) 1884 ntasks = vdev_count_leaves(dp->dp_spa) * 4; 1885 tq = taskq_create("dmu_objset_find", ntasks, minclsyspri, ntasks, 1886 INT_MAX, 0); 1887 if (tq == NULL) { 1888 kmem_free(dcp, sizeof (*dcp)); 1889 mutex_destroy(&err_lock); 1890 1891 return (SET_ERROR(ENOMEM)); 1892 } 1893 dcp->dc_tq = tq; 1894 1895 /* dcp will be freed by task */ 1896 (void) taskq_dispatch(tq, dmu_objset_find_dp_cb, dcp, TQ_SLEEP); 1897 1898 /* 1899 * PORTING: this code relies on the property of taskq_wait to wait 1900 * until no more tasks are queued and no more tasks are active. As 1901 * we always queue new tasks from within other tasks, task_wait 1902 * reliably waits for the full recursion to finish, even though we 1903 * enqueue new tasks after taskq_wait has been called. 1904 * On platforms other than illumos, taskq_wait may not have this 1905 * property. 1906 */ 1907 taskq_wait(tq); 1908 taskq_destroy(tq); 1909 mutex_destroy(&err_lock); 1910 1911 return (error); 1912 } 1913 1914 /* 1915 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1916 * The dp_config_rwlock must not be held when this is called, and it 1917 * will not be held when the callback is called. 1918 * Therefore this function should only be used when the pool is not changing 1919 * (e.g. in syncing context), or the callback can deal with the possible races. 1920 */ 1921 static int 1922 dmu_objset_find_impl(spa_t *spa, const char *name, 1923 int func(const char *, void *), void *arg, int flags) 1924 { 1925 dsl_dir_t *dd; 1926 dsl_pool_t *dp = spa_get_dsl(spa); 1927 dsl_dataset_t *ds; 1928 zap_cursor_t zc; 1929 zap_attribute_t *attr; 1930 char *child; 1931 uint64_t thisobj; 1932 int err; 1933 1934 dsl_pool_config_enter(dp, FTAG); 1935 1936 err = dsl_dir_hold(dp, name, FTAG, &dd, NULL); 1937 if (err != 0) { 1938 dsl_pool_config_exit(dp, FTAG); 1939 return (err); 1940 } 1941 1942 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1943 if (dd->dd_myname[0] == '$') { 1944 dsl_dir_rele(dd, FTAG); 1945 dsl_pool_config_exit(dp, FTAG); 1946 return (0); 1947 } 1948 1949 thisobj = dsl_dir_phys(dd)->dd_head_dataset_obj; 1950 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1951 1952 /* 1953 * Iterate over all children. 1954 */ 1955 if (flags & DS_FIND_CHILDREN) { 1956 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1957 dsl_dir_phys(dd)->dd_child_dir_zapobj); 1958 zap_cursor_retrieve(&zc, attr) == 0; 1959 (void) zap_cursor_advance(&zc)) { 1960 ASSERT3U(attr->za_integer_length, ==, 1961 sizeof (uint64_t)); 1962 ASSERT3U(attr->za_num_integers, ==, 1); 1963 1964 child = kmem_asprintf("%s/%s", name, attr->za_name); 1965 dsl_pool_config_exit(dp, FTAG); 1966 err = dmu_objset_find_impl(spa, child, 1967 func, arg, flags); 1968 dsl_pool_config_enter(dp, FTAG); 1969 strfree(child); 1970 if (err != 0) 1971 break; 1972 } 1973 zap_cursor_fini(&zc); 1974 1975 if (err != 0) { 1976 dsl_dir_rele(dd, FTAG); 1977 dsl_pool_config_exit(dp, FTAG); 1978 kmem_free(attr, sizeof (zap_attribute_t)); 1979 return (err); 1980 } 1981 } 1982 1983 /* 1984 * Iterate over all snapshots. 1985 */ 1986 if (flags & DS_FIND_SNAPSHOTS) { 1987 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1988 1989 if (err == 0) { 1990 uint64_t snapobj; 1991 1992 snapobj = dsl_dataset_phys(ds)->ds_snapnames_zapobj; 1993 dsl_dataset_rele(ds, FTAG); 1994 1995 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1996 zap_cursor_retrieve(&zc, attr) == 0; 1997 (void) zap_cursor_advance(&zc)) { 1998 ASSERT3U(attr->za_integer_length, ==, 1999 sizeof (uint64_t)); 2000 ASSERT3U(attr->za_num_integers, ==, 1); 2001 2002 child = kmem_asprintf("%s@%s", 2003 name, attr->za_name); 2004 dsl_pool_config_exit(dp, FTAG); 2005 err = func(child, arg); 2006 dsl_pool_config_enter(dp, FTAG); 2007 strfree(child); 2008 if (err != 0) 2009 break; 2010 } 2011 zap_cursor_fini(&zc); 2012 } 2013 } 2014 2015 dsl_dir_rele(dd, FTAG); 2016 kmem_free(attr, sizeof (zap_attribute_t)); 2017 dsl_pool_config_exit(dp, FTAG); 2018 2019 if (err != 0) 2020 return (err); 2021 2022 /* Apply to self. */ 2023 return (func(name, arg)); 2024 } 2025 2026 /* 2027 * See comment above dmu_objset_find_impl(). 2028 */ 2029 int 2030 dmu_objset_find(char *name, int func(const char *, void *), void *arg, 2031 int flags) 2032 { 2033 spa_t *spa; 2034 int error; 2035 2036 error = spa_open(name, &spa, FTAG); 2037 if (error != 0) 2038 return (error); 2039 error = dmu_objset_find_impl(spa, name, func, arg, flags); 2040 spa_close(spa, FTAG); 2041 return (error); 2042 } 2043 2044 void 2045 dmu_objset_set_user(objset_t *os, void *user_ptr) 2046 { 2047 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 2048 os->os_user_ptr = user_ptr; 2049 } 2050 2051 void * 2052 dmu_objset_get_user(objset_t *os) 2053 { 2054 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 2055 return (os->os_user_ptr); 2056 } 2057 2058 /* 2059 * Determine name of filesystem, given name of snapshot. 2060 * buf must be at least ZFS_MAX_DATASET_NAME_LEN bytes 2061 */ 2062 int 2063 dmu_fsname(const char *snapname, char *buf) 2064 { 2065 char *atp = strchr(snapname, '@'); 2066 if (atp == NULL) 2067 return (SET_ERROR(EINVAL)); 2068 if (atp - snapname >= ZFS_MAX_DATASET_NAME_LEN) 2069 return (SET_ERROR(ENAMETOOLONG)); 2070 (void) strlcpy(buf, snapname, atp - snapname + 1); 2071 return (0); 2072 } 2073
Indexes created Wed Jun 10 00:26:05 UTC 2026