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 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <sys/cred.h> 27 #include <sys/zfs_context.h> 28 #include <sys/dmu_objset.h> 29 #include <sys/dsl_dir.h> 30 #include <sys/dsl_dataset.h> 31 #include <sys/dsl_prop.h> 32 #include <sys/dsl_pool.h> 33 #include <sys/dsl_synctask.h> 34 #include <sys/dsl_deleg.h> 35 #include <sys/dnode.h> 36 #include <sys/dbuf.h> 37 #include <sys/zvol.h> 38 #include <sys/dmu_tx.h> 39 #include <sys/zio_checksum.h> 40 #include <sys/zap.h> 41 #include <sys/zil.h> 42 #include <sys/dmu_impl.h> 43 #include <sys/zfs_ioctl.h> 44 45 spa_t * 46 dmu_objset_spa(objset_t *os) 47 { 48 return (os->os_spa); 49 } 50 51 zilog_t * 52 dmu_objset_zil(objset_t *os) 53 { 54 return (os->os_zil); 55 } 56 57 dsl_pool_t * 58 dmu_objset_pool(objset_t *os) 59 { 60 dsl_dataset_t *ds; 61 62 if ((ds = os->os_dsl_dataset) != NULL && ds->ds_dir) 63 return (ds->ds_dir->dd_pool); 64 else 65 return (spa_get_dsl(os->os_spa)); 66 } 67 68 dsl_dataset_t * 69 dmu_objset_ds(objset_t *os) 70 { 71 return (os->os_dsl_dataset); 72 } 73 74 dmu_objset_type_t 75 dmu_objset_type(objset_t *os) 76 { 77 return (os->os_phys->os_type); 78 } 79 80 void 81 dmu_objset_name(objset_t *os, char *buf) 82 { 83 dsl_dataset_name(os->os_dsl_dataset, buf); 84 } 85 86 uint64_t 87 dmu_objset_id(objset_t *os) 88 { 89 dsl_dataset_t *ds = os->os_dsl_dataset; 90 91 return (ds ? ds->ds_object : 0); 92 } 93 94 uint64_t 95 dmu_objset_logbias(objset_t *os) 96 { 97 return (os->os_logbias); 98 } 99 100 static void 101 checksum_changed_cb(void *arg, uint64_t newval) 102 { 103 objset_t *os = arg; 104 105 /* 106 * Inheritance should have been done by now. 107 */ 108 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 109 110 os->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 111 } 112 113 static void 114 compression_changed_cb(void *arg, uint64_t newval) 115 { 116 objset_t *os = arg; 117 118 /* 119 * Inheritance and range checking should have been done by now. 120 */ 121 ASSERT(newval != ZIO_COMPRESS_INHERIT); 122 123 os->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); 124 } 125 126 static void 127 copies_changed_cb(void *arg, uint64_t newval) 128 { 129 objset_t *os = arg; 130 131 /* 132 * Inheritance and range checking should have been done by now. 133 */ 134 ASSERT(newval > 0); 135 ASSERT(newval <= spa_max_replication(os->os_spa)); 136 137 os->os_copies = newval; 138 } 139 140 static void 141 primary_cache_changed_cb(void *arg, uint64_t newval) 142 { 143 objset_t *os = arg; 144 145 /* 146 * Inheritance and range checking should have been done by now. 147 */ 148 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 149 newval == ZFS_CACHE_METADATA); 150 151 os->os_primary_cache = newval; 152 } 153 154 static void 155 secondary_cache_changed_cb(void *arg, uint64_t newval) 156 { 157 objset_t *os = arg; 158 159 /* 160 * Inheritance and range checking should have been done by now. 161 */ 162 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 163 newval == ZFS_CACHE_METADATA); 164 165 os->os_secondary_cache = newval; 166 } 167 168 static void 169 logbias_changed_cb(void *arg, uint64_t newval) 170 { 171 objset_t *os = arg; 172 173 ASSERT(newval == ZFS_LOGBIAS_LATENCY || 174 newval == ZFS_LOGBIAS_THROUGHPUT); 175 os->os_logbias = newval; 176 if (os->os_zil) 177 zil_set_logbias(os->os_zil, newval); 178 } 179 180 void 181 dmu_objset_byteswap(void *buf, size_t size) 182 { 183 objset_phys_t *osp = buf; 184 185 ASSERT(size == OBJSET_OLD_PHYS_SIZE || size == sizeof (objset_phys_t)); 186 dnode_byteswap(&osp->os_meta_dnode); 187 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 188 osp->os_type = BSWAP_64(osp->os_type); 189 osp->os_flags = BSWAP_64(osp->os_flags); 190 if (size == sizeof (objset_phys_t)) { 191 dnode_byteswap(&osp->os_userused_dnode); 192 dnode_byteswap(&osp->os_groupused_dnode); 193 } 194 } 195 196 int 197 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 198 objset_t **osp) 199 { 200 objset_t *os; 201 int i, err; 202 203 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 204 205 os = kmem_zalloc(sizeof (objset_t), KM_SLEEP); 206 os->os_dsl_dataset = ds; 207 os->os_spa = spa; 208 os->os_rootbp = bp; 209 if (!BP_IS_HOLE(os->os_rootbp)) { 210 uint32_t aflags = ARC_WAIT; 211 zbookmark_t zb; 212 zb.zb_objset = ds ? ds->ds_object : 0; 213 zb.zb_object = 0; 214 zb.zb_level = -1; 215 zb.zb_blkid = 0; 216 if (DMU_OS_IS_L2CACHEABLE(os)) 217 aflags |= ARC_L2CACHE; 218 219 dprintf_bp(os->os_rootbp, "reading %s", ""); 220 /* 221 * NB: when bprewrite scrub can change the bp, 222 * and this is called from dmu_objset_open_ds_os, the bp 223 * could change, and we'll need a lock. 224 */ 225 err = arc_read_nolock(NULL, spa, os->os_rootbp, 226 arc_getbuf_func, &os->os_phys_buf, 227 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 228 if (err) { 229 kmem_free(os, sizeof (objset_t)); 230 /* convert checksum errors into IO errors */ 231 if (err == ECKSUM) 232 err = EIO; 233 return (err); 234 } 235 236 /* Increase the blocksize if we are permitted. */ 237 if (spa_version(spa) >= SPA_VERSION_USERSPACE && 238 arc_buf_size(os->os_phys_buf) < sizeof (objset_phys_t)) { 239 arc_buf_t *buf = arc_buf_alloc(spa, 240 sizeof (objset_phys_t), &os->os_phys_buf, 241 ARC_BUFC_METADATA); 242 bzero(buf->b_data, sizeof (objset_phys_t)); 243 bcopy(os->os_phys_buf->b_data, buf->b_data, 244 arc_buf_size(os->os_phys_buf)); 245 (void) arc_buf_remove_ref(os->os_phys_buf, 246 &os->os_phys_buf); 247 os->os_phys_buf = buf; 248 } 249 250 os->os_phys = os->os_phys_buf->b_data; 251 os->os_flags = os->os_phys->os_flags; 252 } else { 253 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? 254 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; 255 os->os_phys_buf = arc_buf_alloc(spa, size, 256 &os->os_phys_buf, ARC_BUFC_METADATA); 257 os->os_phys = os->os_phys_buf->b_data; 258 bzero(os->os_phys, size); 259 } 260 261 /* 262 * Note: the changed_cb will be called once before the register 263 * func returns, thus changing the checksum/compression from the 264 * default (fletcher2/off). Snapshots don't need to know about 265 * checksum/compression/copies. 266 */ 267 if (ds) { 268 err = dsl_prop_register(ds, "primarycache", 269 primary_cache_changed_cb, os); 270 if (err == 0) 271 err = dsl_prop_register(ds, "secondarycache", 272 secondary_cache_changed_cb, os); 273 if (!dsl_dataset_is_snapshot(ds)) { 274 if (err == 0) 275 err = dsl_prop_register(ds, "checksum", 276 checksum_changed_cb, os); 277 if (err == 0) 278 err = dsl_prop_register(ds, "compression", 279 compression_changed_cb, os); 280 if (err == 0) 281 err = dsl_prop_register(ds, "copies", 282 copies_changed_cb, os); 283 if (err == 0) 284 err = dsl_prop_register(ds, "logbias", 285 logbias_changed_cb, os); 286 } 287 if (err) { 288 VERIFY(arc_buf_remove_ref(os->os_phys_buf, 289 &os->os_phys_buf) == 1); 290 kmem_free(os, sizeof (objset_t)); 291 return (err); 292 } 293 } else if (ds == NULL) { 294 /* It's the meta-objset. */ 295 os->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 296 os->os_compress = ZIO_COMPRESS_LZJB; 297 os->os_copies = spa_max_replication(spa); 298 os->os_primary_cache = ZFS_CACHE_ALL; 299 os->os_secondary_cache = ZFS_CACHE_ALL; 300 } 301 302 os->os_zil_header = os->os_phys->os_zil_header; 303 os->os_zil = zil_alloc(os, &os->os_zil_header); 304 305 for (i = 0; i < TXG_SIZE; i++) { 306 list_create(&os->os_dirty_dnodes[i], sizeof (dnode_t), 307 offsetof(dnode_t, dn_dirty_link[i])); 308 list_create(&os->os_free_dnodes[i], sizeof (dnode_t), 309 offsetof(dnode_t, dn_dirty_link[i])); 310 } 311 list_create(&os->os_dnodes, sizeof (dnode_t), 312 offsetof(dnode_t, dn_link)); 313 list_create(&os->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 314 offsetof(dmu_buf_impl_t, db_link)); 315 316 mutex_init(&os->os_lock, NULL, MUTEX_DEFAULT, NULL); 317 mutex_init(&os->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 318 mutex_init(&os->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 319 320 os->os_meta_dnode = dnode_special_open(os, 321 &os->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT); 322 if (arc_buf_size(os->os_phys_buf) >= sizeof (objset_phys_t)) { 323 os->os_userused_dnode = dnode_special_open(os, 324 &os->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT); 325 os->os_groupused_dnode = dnode_special_open(os, 326 &os->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT); 327 } 328 329 /* 330 * We should be the only thread trying to do this because we 331 * have ds_opening_lock 332 */ 333 if (ds) { 334 mutex_enter(&ds->ds_lock); 335 ASSERT(ds->ds_objset == NULL); 336 ds->ds_objset = os; 337 mutex_exit(&ds->ds_lock); 338 } 339 340 *osp = os; 341 return (0); 342 } 343 344 int 345 dmu_objset_from_ds(dsl_dataset_t *ds, objset_t **osp) 346 { 347 int err = 0; 348 349 mutex_enter(&ds->ds_opening_lock); 350 *osp = ds->ds_objset; 351 if (*osp == NULL) { 352 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 353 ds, &ds->ds_phys->ds_bp, osp); 354 } 355 mutex_exit(&ds->ds_opening_lock); 356 return (err); 357 } 358 359 /* called from zpl */ 360 int 361 dmu_objset_hold(const char *name, void *tag, objset_t **osp) 362 { 363 dsl_dataset_t *ds; 364 int err; 365 366 err = dsl_dataset_hold(name, tag, &ds); 367 if (err) 368 return (err); 369 370 err = dmu_objset_from_ds(ds, osp); 371 if (err) 372 dsl_dataset_rele(ds, tag); 373 374 return (err); 375 } 376 377 /* called from zpl */ 378 int 379 dmu_objset_own(const char *name, dmu_objset_type_t type, 380 boolean_t readonly, void *tag, objset_t **osp) 381 { 382 dsl_dataset_t *ds; 383 int err; 384 385 err = dsl_dataset_own(name, B_FALSE, tag, &ds); 386 if (err) 387 return (err); 388 389 err = dmu_objset_from_ds(ds, osp); 390 if (err) { 391 dsl_dataset_disown(ds, tag); 392 } else if ((type != DMU_OST_ANY && type != (*osp)->os_phys->os_type) || 393 (!readonly && dsl_dataset_is_snapshot(ds))) { 394 dmu_objset_disown(*osp, tag); 395 return (EINVAL); 396 } 397 398 return (err); 399 } 400 401 void 402 dmu_objset_rele(objset_t *os, void *tag) 403 { 404 dsl_dataset_rele(os->os_dsl_dataset, tag); 405 } 406 407 void 408 dmu_objset_disown(objset_t *os, void *tag) 409 { 410 dsl_dataset_disown(os->os_dsl_dataset, tag); 411 } 412 413 int 414 dmu_objset_evict_dbufs(objset_t *os) 415 { 416 dnode_t *dn; 417 418 mutex_enter(&os->os_lock); 419 420 /* process the mdn last, since the other dnodes have holds on it */ 421 list_remove(&os->os_dnodes, os->os_meta_dnode); 422 list_insert_tail(&os->os_dnodes, os->os_meta_dnode); 423 424 /* 425 * Find the first dnode with holds. We have to do this dance 426 * because dnode_add_ref() only works if you already have a 427 * hold. If there are no holds then it has no dbufs so OK to 428 * skip. 429 */ 430 for (dn = list_head(&os->os_dnodes); 431 dn && !dnode_add_ref(dn, FTAG); 432 dn = list_next(&os->os_dnodes, dn)) 433 continue; 434 435 while (dn) { 436 dnode_t *next_dn = dn; 437 438 do { 439 next_dn = list_next(&os->os_dnodes, next_dn); 440 } while (next_dn && !dnode_add_ref(next_dn, FTAG)); 441 442 mutex_exit(&os->os_lock); 443 dnode_evict_dbufs(dn); 444 dnode_rele(dn, FTAG); 445 mutex_enter(&os->os_lock); 446 dn = next_dn; 447 } 448 mutex_exit(&os->os_lock); 449 return (list_head(&os->os_dnodes) != os->os_meta_dnode); 450 } 451 452 void 453 dmu_objset_evict(objset_t *os) 454 { 455 dsl_dataset_t *ds = os->os_dsl_dataset; 456 int i; 457 458 for (i = 0; i < TXG_SIZE; i++) { 459 ASSERT(list_head(&os->os_dirty_dnodes[i]) == NULL); 460 ASSERT(list_head(&os->os_free_dnodes[i]) == NULL); 461 } 462 463 if (ds) { 464 if (!dsl_dataset_is_snapshot(ds)) { 465 VERIFY(0 == dsl_prop_unregister(ds, "checksum", 466 checksum_changed_cb, os)); 467 VERIFY(0 == dsl_prop_unregister(ds, "compression", 468 compression_changed_cb, os)); 469 VERIFY(0 == dsl_prop_unregister(ds, "copies", 470 copies_changed_cb, os)); 471 VERIFY(0 == dsl_prop_unregister(ds, "logbias", 472 logbias_changed_cb, os)); 473 } 474 VERIFY(0 == dsl_prop_unregister(ds, "primarycache", 475 primary_cache_changed_cb, os)); 476 VERIFY(0 == dsl_prop_unregister(ds, "secondarycache", 477 secondary_cache_changed_cb, os)); 478 } 479 480 /* 481 * We should need only a single pass over the dnode list, since 482 * nothing can be added to the list at this point. 483 */ 484 (void) dmu_objset_evict_dbufs(os); 485 486 dnode_special_close(os->os_meta_dnode); 487 if (os->os_userused_dnode) { 488 dnode_special_close(os->os_userused_dnode); 489 dnode_special_close(os->os_groupused_dnode); 490 } 491 zil_free(os->os_zil); 492 493 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 494 495 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1); 496 mutex_destroy(&os->os_lock); 497 mutex_destroy(&os->os_obj_lock); 498 mutex_destroy(&os->os_user_ptr_lock); 499 kmem_free(os, sizeof (objset_t)); 500 } 501 502 /* called from dsl for meta-objset */ 503 objset_t * 504 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 505 dmu_objset_type_t type, dmu_tx_t *tx) 506 { 507 objset_t *os; 508 dnode_t *mdn; 509 510 ASSERT(dmu_tx_is_syncing(tx)); 511 if (ds) 512 mutex_enter(&ds->ds_opening_lock); 513 VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &os)); 514 if (ds) 515 mutex_exit(&ds->ds_opening_lock); 516 mdn = os->os_meta_dnode; 517 518 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 519 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 520 521 /* 522 * We don't want to have to increase the meta-dnode's nlevels 523 * later, because then we could do it in quescing context while 524 * we are also accessing it in open context. 525 * 526 * This precaution is not necessary for the MOS (ds == NULL), 527 * because the MOS is only updated in syncing context. 528 * This is most fortunate: the MOS is the only objset that 529 * needs to be synced multiple times as spa_sync() iterates 530 * to convergence, so minimizing its dn_nlevels matters. 531 */ 532 if (ds != NULL) { 533 int levels = 1; 534 535 /* 536 * Determine the number of levels necessary for the meta-dnode 537 * to contain DN_MAX_OBJECT dnodes. 538 */ 539 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 540 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 541 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 542 levels++; 543 544 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 545 mdn->dn_nlevels = levels; 546 } 547 548 ASSERT(type != DMU_OST_NONE); 549 ASSERT(type != DMU_OST_ANY); 550 ASSERT(type < DMU_OST_NUMTYPES); 551 os->os_phys->os_type = type; 552 if (dmu_objset_userused_enabled(os)) { 553 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 554 os->os_flags = os->os_phys->os_flags; 555 } 556 557 dsl_dataset_dirty(ds, tx); 558 559 return (os); 560 } 561 562 struct oscarg { 563 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); 564 void *userarg; 565 dsl_dataset_t *clone_origin; 566 const char *lastname; 567 dmu_objset_type_t type; 568 uint64_t flags; 569 }; 570 571 /*ARGSUSED*/ 572 static int 573 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) 574 { 575 dsl_dir_t *dd = arg1; 576 struct oscarg *oa = arg2; 577 objset_t *mos = dd->dd_pool->dp_meta_objset; 578 int err; 579 uint64_t ddobj; 580 581 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 582 oa->lastname, sizeof (uint64_t), 1, &ddobj); 583 if (err != ENOENT) 584 return (err ? err : EEXIST); 585 586 if (oa->clone_origin != NULL) { 587 /* You can't clone across pools. */ 588 if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool) 589 return (EXDEV); 590 591 /* You can only clone snapshots, not the head datasets. */ 592 if (!dsl_dataset_is_snapshot(oa->clone_origin)) 593 return (EINVAL); 594 } 595 596 return (0); 597 } 598 599 static void 600 dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 601 { 602 dsl_dir_t *dd = arg1; 603 struct oscarg *oa = arg2; 604 uint64_t dsobj; 605 606 ASSERT(dmu_tx_is_syncing(tx)); 607 608 dsobj = dsl_dataset_create_sync(dd, oa->lastname, 609 oa->clone_origin, oa->flags, cr, tx); 610 611 if (oa->clone_origin == NULL) { 612 dsl_dataset_t *ds; 613 blkptr_t *bp; 614 objset_t *os; 615 616 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj, 617 FTAG, &ds)); 618 bp = dsl_dataset_get_blkptr(ds); 619 ASSERT(BP_IS_HOLE(bp)); 620 621 os = dmu_objset_create_impl(dsl_dataset_get_spa(ds), 622 ds, bp, oa->type, tx); 623 624 if (oa->userfunc) 625 oa->userfunc(os, oa->userarg, cr, tx); 626 dsl_dataset_rele(ds, FTAG); 627 } 628 629 spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa, 630 tx, cr, "dataset = %llu", dsobj); 631 } 632 633 int 634 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 635 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 636 { 637 dsl_dir_t *pdd; 638 const char *tail; 639 int err = 0; 640 struct oscarg oa = { 0 }; 641 642 ASSERT(strchr(name, '@') == NULL); 643 err = dsl_dir_open(name, FTAG, &pdd, &tail); 644 if (err) 645 return (err); 646 if (tail == NULL) { 647 dsl_dir_close(pdd, FTAG); 648 return (EEXIST); 649 } 650 651 oa.userfunc = func; 652 oa.userarg = arg; 653 oa.lastname = tail; 654 oa.type = type; 655 oa.flags = flags; 656 657 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 658 dmu_objset_create_sync, pdd, &oa, 5); 659 dsl_dir_close(pdd, FTAG); 660 return (err); 661 } 662 663 int 664 dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags) 665 { 666 dsl_dir_t *pdd; 667 const char *tail; 668 int err = 0; 669 struct oscarg oa = { 0 }; 670 671 ASSERT(strchr(name, '@') == NULL); 672 err = dsl_dir_open(name, FTAG, &pdd, &tail); 673 if (err) 674 return (err); 675 if (tail == NULL) { 676 dsl_dir_close(pdd, FTAG); 677 return (EEXIST); 678 } 679 680 oa.lastname = tail; 681 oa.clone_origin = clone_origin; 682 oa.flags = flags; 683 684 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 685 dmu_objset_create_sync, pdd, &oa, 5); 686 dsl_dir_close(pdd, FTAG); 687 return (err); 688 } 689 690 int 691 dmu_objset_destroy(const char *name, boolean_t defer) 692 { 693 dsl_dataset_t *ds; 694 int error; 695 696 /* 697 * dsl_dataset_destroy() can free any claimed-but-unplayed 698 * intent log, but if there is an active log, it has blocks that 699 * are allocated, but may not yet be reflected in the on-disk 700 * structure. Only the ZIL knows how to free them, so we have 701 * to call into it here. 702 */ 703 error = dsl_dataset_own(name, B_TRUE, FTAG, &ds); 704 if (error == 0) { 705 objset_t *os; 706 if (dmu_objset_from_ds(ds, &os) == 0) 707 zil_destroy(dmu_objset_zil(os), B_FALSE); 708 error = dsl_dataset_destroy(ds, FTAG, defer); 709 /* dsl_dataset_destroy() closes the ds. */ 710 } 711 712 return (error); 713 } 714 715 struct snaparg { 716 dsl_sync_task_group_t *dstg; 717 char *snapname; 718 char failed[MAXPATHLEN]; 719 boolean_t checkperms; 720 nvlist_t *props; 721 }; 722 723 static int 724 snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 725 { 726 objset_t *os = arg1; 727 struct snaparg *sn = arg2; 728 729 /* The props have already been checked by zfs_check_userprops(). */ 730 731 return (dsl_dataset_snapshot_check(os->os_dsl_dataset, 732 sn->snapname, tx)); 733 } 734 735 static void 736 snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 737 { 738 objset_t *os = arg1; 739 dsl_dataset_t *ds = os->os_dsl_dataset; 740 struct snaparg *sn = arg2; 741 742 dsl_dataset_snapshot_sync(ds, sn->snapname, cr, tx); 743 744 if (sn->props) 745 dsl_props_set_sync(ds->ds_prev, sn->props, cr, tx); 746 } 747 748 static int 749 dmu_objset_snapshot_one(char *name, void *arg) 750 { 751 struct snaparg *sn = arg; 752 objset_t *os; 753 int err; 754 755 (void) strcpy(sn->failed, name); 756 757 /* 758 * Check permissions only when requested. This only applies when 759 * doing a recursive snapshot. The permission checks for the starting 760 * dataset have already been performed in zfs_secpolicy_snapshot() 761 */ 762 if (sn->checkperms == B_TRUE && 763 (err = zfs_secpolicy_snapshot_perms(name, CRED()))) 764 return (err); 765 766 err = dmu_objset_hold(name, sn, &os); 767 if (err != 0) 768 return (err); 769 770 /* If the objset is in an inconsistent state, return busy */ 771 if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) { 772 dmu_objset_rele(os, sn); 773 return (EBUSY); 774 } 775 776 /* 777 * NB: we need to wait for all in-flight changes to get to disk, 778 * so that we snapshot those changes. zil_suspend does this as 779 * a side effect. 780 */ 781 err = zil_suspend(dmu_objset_zil(os)); 782 if (err == 0) { 783 dsl_sync_task_create(sn->dstg, snapshot_check, 784 snapshot_sync, os, sn, 3); 785 } else { 786 dmu_objset_rele(os, sn); 787 } 788 789 return (err); 790 } 791 792 int 793 dmu_objset_snapshot(char *fsname, char *snapname, 794 nvlist_t *props, boolean_t recursive) 795 { 796 dsl_sync_task_t *dst; 797 struct snaparg sn; 798 spa_t *spa; 799 int err; 800 801 (void) strcpy(sn.failed, fsname); 802 803 err = spa_open(fsname, &spa, FTAG); 804 if (err) 805 return (err); 806 807 sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 808 sn.snapname = snapname; 809 sn.props = props; 810 811 if (recursive) { 812 sn.checkperms = B_TRUE; 813 err = dmu_objset_find(fsname, 814 dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); 815 } else { 816 sn.checkperms = B_FALSE; 817 err = dmu_objset_snapshot_one(fsname, &sn); 818 } 819 820 if (err == 0) 821 err = dsl_sync_task_group_wait(sn.dstg); 822 823 for (dst = list_head(&sn.dstg->dstg_tasks); dst; 824 dst = list_next(&sn.dstg->dstg_tasks, dst)) { 825 objset_t *os = dst->dst_arg1; 826 dsl_dataset_t *ds = os->os_dsl_dataset; 827 if (dst->dst_err) 828 dsl_dataset_name(ds, sn.failed); 829 zil_resume(dmu_objset_zil(os)); 830 dmu_objset_rele(os, &sn); 831 } 832 833 if (err) 834 (void) strcpy(fsname, sn.failed); 835 dsl_sync_task_group_destroy(sn.dstg); 836 spa_close(spa, FTAG); 837 return (err); 838 } 839 840 static void 841 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) 842 { 843 dnode_t *dn; 844 845 while (dn = list_head(list)) { 846 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 847 ASSERT(dn->dn_dbuf->db_data_pending); 848 /* 849 * Initialize dn_zio outside dnode_sync() because the 850 * meta-dnode needs to set it ouside dnode_sync(). 851 */ 852 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 853 ASSERT(dn->dn_zio); 854 855 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 856 list_remove(list, dn); 857 858 if (newlist) { 859 (void) dnode_add_ref(dn, newlist); 860 list_insert_tail(newlist, dn); 861 } 862 863 dnode_sync(dn, tx); 864 } 865 } 866 867 /* ARGSUSED */ 868 static void 869 ready(zio_t *zio, arc_buf_t *abuf, void *arg) 870 { 871 blkptr_t *bp = zio->io_bp; 872 blkptr_t *bp_orig = &zio->io_bp_orig; 873 objset_t *os = arg; 874 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 875 876 ASSERT(bp == os->os_rootbp); 877 ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET); 878 ASSERT(BP_GET_LEVEL(bp) == 0); 879 880 /* 881 * Update rootbp fill count: it should be the number of objects 882 * allocated in the object set (not counting the "special" 883 * objects that are stored in the objset_phys_t -- the meta 884 * dnode and user/group accounting objects). 885 */ 886 bp->blk_fill = 0; 887 for (int i = 0; i < dnp->dn_nblkptr; i++) 888 bp->blk_fill += dnp->dn_blkptr[i].blk_fill; 889 890 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 891 ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig))); 892 } else { 893 if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg) 894 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 895 &zio->io_bp_orig, zio, os->os_synctx); 896 dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx); 897 } 898 } 899 900 /* called from dsl */ 901 void 902 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 903 { 904 int txgoff; 905 zbookmark_t zb; 906 writeprops_t wp = { 0 }; 907 zio_t *zio; 908 list_t *list; 909 list_t *newlist = NULL; 910 dbuf_dirty_record_t *dr; 911 912 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 913 914 ASSERT(dmu_tx_is_syncing(tx)); 915 /* XXX the write_done callback should really give us the tx... */ 916 os->os_synctx = tx; 917 918 if (os->os_dsl_dataset == NULL) { 919 /* 920 * This is the MOS. If we have upgraded, 921 * spa_max_replication() could change, so reset 922 * os_copies here. 923 */ 924 os->os_copies = spa_max_replication(os->os_spa); 925 } 926 927 /* 928 * Create the root block IO 929 */ 930 zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 931 zb.zb_object = 0; 932 zb.zb_level = -1; /* for block ordering; it's level 0 on disk */ 933 zb.zb_blkid = 0; 934 935 wp.wp_type = DMU_OT_OBJSET; 936 wp.wp_level = 0; /* on-disk BP level; see above */ 937 wp.wp_copies = os->os_copies; 938 wp.wp_oschecksum = os->os_checksum; 939 wp.wp_oscompress = os->os_compress; 940 941 if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) { 942 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 943 os->os_rootbp, pio, tx); 944 } 945 946 arc_release(os->os_phys_buf, &os->os_phys_buf); 947 948 zio = arc_write(pio, os->os_spa, &wp, DMU_OS_IS_L2CACHEABLE(os), 949 tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, NULL, os, 950 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 951 952 /* 953 * Sync special dnodes - the parent IO for the sync is the root block 954 */ 955 os->os_meta_dnode->dn_zio = zio; 956 dnode_sync(os->os_meta_dnode, tx); 957 958 os->os_phys->os_flags = os->os_flags; 959 960 if (os->os_userused_dnode && 961 os->os_userused_dnode->dn_type != DMU_OT_NONE) { 962 os->os_userused_dnode->dn_zio = zio; 963 dnode_sync(os->os_userused_dnode, tx); 964 os->os_groupused_dnode->dn_zio = zio; 965 dnode_sync(os->os_groupused_dnode, tx); 966 } 967 968 txgoff = tx->tx_txg & TXG_MASK; 969 970 if (dmu_objset_userused_enabled(os)) { 971 newlist = &os->os_synced_dnodes; 972 /* 973 * We must create the list here because it uses the 974 * dn_dirty_link[] of this txg. 975 */ 976 list_create(newlist, sizeof (dnode_t), 977 offsetof(dnode_t, dn_dirty_link[txgoff])); 978 } 979 980 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); 981 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); 982 983 list = &os->os_meta_dnode->dn_dirty_records[txgoff]; 984 while (dr = list_head(list)) { 985 ASSERT(dr->dr_dbuf->db_level == 0); 986 list_remove(list, dr); 987 if (dr->dr_zio) 988 zio_nowait(dr->dr_zio); 989 } 990 /* 991 * Free intent log blocks up to this tx. 992 */ 993 zil_sync(os->os_zil, tx); 994 os->os_phys->os_zil_header = os->os_zil_header; 995 zio_nowait(zio); 996 } 997 998 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 999 1000 void 1001 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1002 { 1003 used_cbs[ost] = cb; 1004 } 1005 1006 boolean_t 1007 dmu_objset_userused_enabled(objset_t *os) 1008 { 1009 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1010 used_cbs[os->os_phys->os_type] && 1011 os->os_userused_dnode); 1012 } 1013 1014 void 1015 dmu_objset_do_userquota_callbacks(objset_t *os, dmu_tx_t *tx) 1016 { 1017 dnode_t *dn; 1018 list_t *list = &os->os_synced_dnodes; 1019 static const char zerobuf[DN_MAX_BONUSLEN] = {0}; 1020 1021 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); 1022 1023 while (dn = list_head(list)) { 1024 dmu_object_type_t bonustype; 1025 1026 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1027 ASSERT(dn->dn_oldphys); 1028 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1029 dn->dn_phys->dn_flags & 1030 DNODE_FLAG_USERUSED_ACCOUNTED); 1031 1032 /* Allocate the user/groupused objects if necessary. */ 1033 if (os->os_userused_dnode->dn_type == DMU_OT_NONE) { 1034 VERIFY(0 == zap_create_claim(os, 1035 DMU_USERUSED_OBJECT, 1036 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1037 VERIFY(0 == zap_create_claim(os, 1038 DMU_GROUPUSED_OBJECT, 1039 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1040 } 1041 1042 /* 1043 * If the object was not previously 1044 * accounted, pretend that it was free. 1045 */ 1046 if (!(dn->dn_oldphys->dn_flags & 1047 DNODE_FLAG_USERUSED_ACCOUNTED)) { 1048 bzero(dn->dn_oldphys, sizeof (dnode_phys_t)); 1049 } 1050 1051 /* 1052 * If the object was freed, use the previous bonustype. 1053 */ 1054 bonustype = dn->dn_phys->dn_bonustype ? 1055 dn->dn_phys->dn_bonustype : dn->dn_oldphys->dn_bonustype; 1056 ASSERT(dn->dn_phys->dn_type != 0 || 1057 (bcmp(DN_BONUS(dn->dn_phys), zerobuf, 1058 DN_MAX_BONUSLEN) == 0 && 1059 DN_USED_BYTES(dn->dn_phys) == 0)); 1060 ASSERT(dn->dn_oldphys->dn_type != 0 || 1061 (bcmp(DN_BONUS(dn->dn_oldphys), zerobuf, 1062 DN_MAX_BONUSLEN) == 0 && 1063 DN_USED_BYTES(dn->dn_oldphys) == 0)); 1064 used_cbs[os->os_phys->os_type](os, bonustype, 1065 DN_BONUS(dn->dn_oldphys), DN_BONUS(dn->dn_phys), 1066 DN_USED_BYTES(dn->dn_oldphys), 1067 DN_USED_BYTES(dn->dn_phys), tx); 1068 1069 /* 1070 * The mutex is needed here for interlock with dnode_allocate. 1071 */ 1072 mutex_enter(&dn->dn_mtx); 1073 zio_buf_free(dn->dn_oldphys, sizeof (dnode_phys_t)); 1074 dn->dn_oldphys = NULL; 1075 mutex_exit(&dn->dn_mtx); 1076 1077 list_remove(list, dn); 1078 dnode_rele(dn, list); 1079 } 1080 } 1081 1082 boolean_t 1083 dmu_objset_userspace_present(objset_t *os) 1084 { 1085 return (os->os_phys->os_flags & 1086 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1087 } 1088 1089 int 1090 dmu_objset_userspace_upgrade(objset_t *os) 1091 { 1092 uint64_t obj; 1093 int err = 0; 1094 1095 if (dmu_objset_userspace_present(os)) 1096 return (0); 1097 if (!dmu_objset_userused_enabled(os)) 1098 return (ENOTSUP); 1099 if (dmu_objset_is_snapshot(os)) 1100 return (EINVAL); 1101 1102 /* 1103 * We simply need to mark every object dirty, so that it will be 1104 * synced out and now accounted. If this is called 1105 * concurrently, or if we already did some work before crashing, 1106 * that's fine, since we track each object's accounted state 1107 * independently. 1108 */ 1109 1110 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1111 dmu_tx_t *tx; 1112 dmu_buf_t *db; 1113 int objerr; 1114 1115 if (issig(JUSTLOOKING) && issig(FORREAL)) 1116 return (EINTR); 1117 1118 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1119 if (objerr) 1120 continue; 1121 tx = dmu_tx_create(os); 1122 dmu_tx_hold_bonus(tx, obj); 1123 objerr = dmu_tx_assign(tx, TXG_WAIT); 1124 if (objerr) { 1125 dmu_tx_abort(tx); 1126 continue; 1127 } 1128 dmu_buf_will_dirty(db, tx); 1129 dmu_buf_rele(db, FTAG); 1130 dmu_tx_commit(tx); 1131 } 1132 1133 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1134 txg_wait_synced(dmu_objset_pool(os), 0); 1135 return (0); 1136 } 1137 1138 void 1139 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1140 uint64_t *usedobjsp, uint64_t *availobjsp) 1141 { 1142 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 1143 usedobjsp, availobjsp); 1144 } 1145 1146 uint64_t 1147 dmu_objset_fsid_guid(objset_t *os) 1148 { 1149 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 1150 } 1151 1152 void 1153 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1154 { 1155 stat->dds_type = os->os_phys->os_type; 1156 if (os->os_dsl_dataset) 1157 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 1158 } 1159 1160 void 1161 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1162 { 1163 ASSERT(os->os_dsl_dataset || 1164 os->os_phys->os_type == DMU_OST_META); 1165 1166 if (os->os_dsl_dataset != NULL) 1167 dsl_dataset_stats(os->os_dsl_dataset, nv); 1168 1169 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1170 os->os_phys->os_type); 1171 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1172 dmu_objset_userspace_present(os)); 1173 } 1174 1175 int 1176 dmu_objset_is_snapshot(objset_t *os) 1177 { 1178 if (os->os_dsl_dataset != NULL) 1179 return (dsl_dataset_is_snapshot(os->os_dsl_dataset)); 1180 else 1181 return (B_FALSE); 1182 } 1183 1184 int 1185 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1186 boolean_t *conflict) 1187 { 1188 dsl_dataset_t *ds = os->os_dsl_dataset; 1189 uint64_t ignored; 1190 1191 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1192 return (ENOENT); 1193 1194 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1195 ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST, 1196 real, maxlen, conflict)); 1197 } 1198 1199 int 1200 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1201 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1202 { 1203 dsl_dataset_t *ds = os->os_dsl_dataset; 1204 zap_cursor_t cursor; 1205 zap_attribute_t attr; 1206 1207 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1208 return (ENOENT); 1209 1210 zap_cursor_init_serialized(&cursor, 1211 ds->ds_dir->dd_pool->dp_meta_objset, 1212 ds->ds_phys->ds_snapnames_zapobj, *offp); 1213 1214 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1215 zap_cursor_fini(&cursor); 1216 return (ENOENT); 1217 } 1218 1219 if (strlen(attr.za_name) + 1 > namelen) { 1220 zap_cursor_fini(&cursor); 1221 return (ENAMETOOLONG); 1222 } 1223 1224 (void) strcpy(name, attr.za_name); 1225 if (idp) 1226 *idp = attr.za_first_integer; 1227 if (case_conflict) 1228 *case_conflict = attr.za_normalization_conflict; 1229 zap_cursor_advance(&cursor); 1230 *offp = zap_cursor_serialize(&cursor); 1231 zap_cursor_fini(&cursor); 1232 1233 return (0); 1234 } 1235 1236 int 1237 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1238 uint64_t *idp, uint64_t *offp) 1239 { 1240 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1241 zap_cursor_t cursor; 1242 zap_attribute_t attr; 1243 1244 /* there is no next dir on a snapshot! */ 1245 if (os->os_dsl_dataset->ds_object != 1246 dd->dd_phys->dd_head_dataset_obj) 1247 return (ENOENT); 1248 1249 zap_cursor_init_serialized(&cursor, 1250 dd->dd_pool->dp_meta_objset, 1251 dd->dd_phys->dd_child_dir_zapobj, *offp); 1252 1253 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1254 zap_cursor_fini(&cursor); 1255 return (ENOENT); 1256 } 1257 1258 if (strlen(attr.za_name) + 1 > namelen) { 1259 zap_cursor_fini(&cursor); 1260 return (ENAMETOOLONG); 1261 } 1262 1263 (void) strcpy(name, attr.za_name); 1264 if (idp) 1265 *idp = attr.za_first_integer; 1266 zap_cursor_advance(&cursor); 1267 *offp = zap_cursor_serialize(&cursor); 1268 zap_cursor_fini(&cursor); 1269 1270 return (0); 1271 } 1272 1273 struct findarg { 1274 int (*func)(char *, void *); 1275 void *arg; 1276 }; 1277 1278 /* ARGSUSED */ 1279 static int 1280 findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) 1281 { 1282 struct findarg *fa = arg; 1283 return (fa->func((char *)dsname, fa->arg)); 1284 } 1285 1286 /* 1287 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1288 * Perhaps change all callers to use dmu_objset_find_spa()? 1289 */ 1290 int 1291 dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags) 1292 { 1293 struct findarg fa; 1294 fa.func = func; 1295 fa.arg = arg; 1296 return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags)); 1297 } 1298 1299 /* 1300 * Find all objsets under name, call func on each 1301 */ 1302 int 1303 dmu_objset_find_spa(spa_t *spa, const char *name, 1304 int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags) 1305 { 1306 dsl_dir_t *dd; 1307 dsl_pool_t *dp; 1308 dsl_dataset_t *ds; 1309 zap_cursor_t zc; 1310 zap_attribute_t *attr; 1311 char *child; 1312 uint64_t thisobj; 1313 int err; 1314 1315 if (name == NULL) 1316 name = spa_name(spa); 1317 err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL); 1318 if (err) 1319 return (err); 1320 1321 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1322 if (dd->dd_myname[0] == '$') { 1323 dsl_dir_close(dd, FTAG); 1324 return (0); 1325 } 1326 1327 thisobj = dd->dd_phys->dd_head_dataset_obj; 1328 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1329 dp = dd->dd_pool; 1330 1331 /* 1332 * Iterate over all children. 1333 */ 1334 if (flags & DS_FIND_CHILDREN) { 1335 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1336 dd->dd_phys->dd_child_dir_zapobj); 1337 zap_cursor_retrieve(&zc, attr) == 0; 1338 (void) zap_cursor_advance(&zc)) { 1339 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 1340 ASSERT(attr->za_num_integers == 1); 1341 1342 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1343 (void) strcpy(child, name); 1344 (void) strcat(child, "/"); 1345 (void) strcat(child, attr->za_name); 1346 err = dmu_objset_find_spa(spa, child, func, arg, flags); 1347 kmem_free(child, MAXPATHLEN); 1348 if (err) 1349 break; 1350 } 1351 zap_cursor_fini(&zc); 1352 1353 if (err) { 1354 dsl_dir_close(dd, FTAG); 1355 kmem_free(attr, sizeof (zap_attribute_t)); 1356 return (err); 1357 } 1358 } 1359 1360 /* 1361 * Iterate over all snapshots. 1362 */ 1363 if (flags & DS_FIND_SNAPSHOTS) { 1364 if (!dsl_pool_sync_context(dp)) 1365 rw_enter(&dp->dp_config_rwlock, RW_READER); 1366 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1367 if (!dsl_pool_sync_context(dp)) 1368 rw_exit(&dp->dp_config_rwlock); 1369 1370 if (err == 0) { 1371 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 1372 dsl_dataset_rele(ds, FTAG); 1373 1374 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1375 zap_cursor_retrieve(&zc, attr) == 0; 1376 (void) zap_cursor_advance(&zc)) { 1377 ASSERT(attr->za_integer_length == 1378 sizeof (uint64_t)); 1379 ASSERT(attr->za_num_integers == 1); 1380 1381 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1382 (void) strcpy(child, name); 1383 (void) strcat(child, "@"); 1384 (void) strcat(child, attr->za_name); 1385 err = func(spa, attr->za_first_integer, 1386 child, arg); 1387 kmem_free(child, MAXPATHLEN); 1388 if (err) 1389 break; 1390 } 1391 zap_cursor_fini(&zc); 1392 } 1393 } 1394 1395 dsl_dir_close(dd, FTAG); 1396 kmem_free(attr, sizeof (zap_attribute_t)); 1397 1398 if (err) 1399 return (err); 1400 1401 /* 1402 * Apply to self if appropriate. 1403 */ 1404 err = func(spa, thisobj, name, arg); 1405 return (err); 1406 } 1407 1408 /* ARGSUSED */ 1409 int 1410 dmu_objset_prefetch(char *name, void *arg) 1411 { 1412 dsl_dataset_t *ds; 1413 1414 if (dsl_dataset_hold(name, FTAG, &ds)) 1415 return (0); 1416 1417 if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) { 1418 mutex_enter(&ds->ds_opening_lock); 1419 if (ds->ds_objset == NULL) { 1420 uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1421 zbookmark_t zb; 1422 1423 zb.zb_objset = ds->ds_object; 1424 zb.zb_object = 0; 1425 zb.zb_level = -1; 1426 zb.zb_blkid = 0; 1427 1428 (void) arc_read_nolock(NULL, dsl_dataset_get_spa(ds), 1429 &ds->ds_phys->ds_bp, NULL, NULL, 1430 ZIO_PRIORITY_ASYNC_READ, 1431 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1432 &aflags, &zb); 1433 } 1434 mutex_exit(&ds->ds_opening_lock); 1435 } 1436 1437 dsl_dataset_rele(ds, FTAG); 1438 return (0); 1439 } 1440 1441 void 1442 dmu_objset_set_user(objset_t *os, void *user_ptr) 1443 { 1444 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1445 os->os_user_ptr = user_ptr; 1446 } 1447 1448 void * 1449 dmu_objset_get_user(objset_t *os) 1450 { 1451 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1452 return (os->os_user_ptr); 1453 } 1454