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 dmu_objset_disown(*osp, tag); 394 return (EINVAL); 395 } else if (!readonly && dsl_dataset_is_snapshot(ds)) { 396 dmu_objset_disown(*osp, tag); 397 return (EROFS); 398 } 399 return (err); 400 } 401 402 void 403 dmu_objset_rele(objset_t *os, void *tag) 404 { 405 dsl_dataset_rele(os->os_dsl_dataset, tag); 406 } 407 408 void 409 dmu_objset_disown(objset_t *os, void *tag) 410 { 411 dsl_dataset_disown(os->os_dsl_dataset, tag); 412 } 413 414 int 415 dmu_objset_evict_dbufs(objset_t *os) 416 { 417 dnode_t *dn; 418 419 mutex_enter(&os->os_lock); 420 421 /* process the mdn last, since the other dnodes have holds on it */ 422 list_remove(&os->os_dnodes, os->os_meta_dnode); 423 list_insert_tail(&os->os_dnodes, os->os_meta_dnode); 424 425 /* 426 * Find the first dnode with holds. We have to do this dance 427 * because dnode_add_ref() only works if you already have a 428 * hold. If there are no holds then it has no dbufs so OK to 429 * skip. 430 */ 431 for (dn = list_head(&os->os_dnodes); 432 dn && !dnode_add_ref(dn, FTAG); 433 dn = list_next(&os->os_dnodes, dn)) 434 continue; 435 436 while (dn) { 437 dnode_t *next_dn = dn; 438 439 do { 440 next_dn = list_next(&os->os_dnodes, next_dn); 441 } while (next_dn && !dnode_add_ref(next_dn, FTAG)); 442 443 mutex_exit(&os->os_lock); 444 dnode_evict_dbufs(dn); 445 dnode_rele(dn, FTAG); 446 mutex_enter(&os->os_lock); 447 dn = next_dn; 448 } 449 mutex_exit(&os->os_lock); 450 return (list_head(&os->os_dnodes) != os->os_meta_dnode); 451 } 452 453 void 454 dmu_objset_evict(objset_t *os) 455 { 456 dsl_dataset_t *ds = os->os_dsl_dataset; 457 int i; 458 459 for (i = 0; i < TXG_SIZE; i++) { 460 ASSERT(list_head(&os->os_dirty_dnodes[i]) == NULL); 461 ASSERT(list_head(&os->os_free_dnodes[i]) == NULL); 462 } 463 464 if (ds) { 465 if (!dsl_dataset_is_snapshot(ds)) { 466 VERIFY(0 == dsl_prop_unregister(ds, "checksum", 467 checksum_changed_cb, os)); 468 VERIFY(0 == dsl_prop_unregister(ds, "compression", 469 compression_changed_cb, os)); 470 VERIFY(0 == dsl_prop_unregister(ds, "copies", 471 copies_changed_cb, os)); 472 VERIFY(0 == dsl_prop_unregister(ds, "logbias", 473 logbias_changed_cb, os)); 474 } 475 VERIFY(0 == dsl_prop_unregister(ds, "primarycache", 476 primary_cache_changed_cb, os)); 477 VERIFY(0 == dsl_prop_unregister(ds, "secondarycache", 478 secondary_cache_changed_cb, os)); 479 } 480 481 /* 482 * We should need only a single pass over the dnode list, since 483 * nothing can be added to the list at this point. 484 */ 485 (void) dmu_objset_evict_dbufs(os); 486 487 dnode_special_close(os->os_meta_dnode); 488 if (os->os_userused_dnode) { 489 dnode_special_close(os->os_userused_dnode); 490 dnode_special_close(os->os_groupused_dnode); 491 } 492 zil_free(os->os_zil); 493 494 ASSERT3P(list_head(&os->os_dnodes), ==, NULL); 495 496 VERIFY(arc_buf_remove_ref(os->os_phys_buf, &os->os_phys_buf) == 1); 497 mutex_destroy(&os->os_lock); 498 mutex_destroy(&os->os_obj_lock); 499 mutex_destroy(&os->os_user_ptr_lock); 500 kmem_free(os, sizeof (objset_t)); 501 } 502 503 timestruc_t 504 dmu_objset_snap_cmtime(objset_t *os) 505 { 506 return (dsl_dir_snap_cmtime(os->os_dsl_dataset->ds_dir)); 507 } 508 509 /* called from dsl for meta-objset */ 510 objset_t * 511 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 512 dmu_objset_type_t type, dmu_tx_t *tx) 513 { 514 objset_t *os; 515 dnode_t *mdn; 516 517 ASSERT(dmu_tx_is_syncing(tx)); 518 if (ds) 519 mutex_enter(&ds->ds_opening_lock); 520 VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &os)); 521 if (ds) 522 mutex_exit(&ds->ds_opening_lock); 523 mdn = os->os_meta_dnode; 524 525 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 526 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 527 528 /* 529 * We don't want to have to increase the meta-dnode's nlevels 530 * later, because then we could do it in quescing context while 531 * we are also accessing it in open context. 532 * 533 * This precaution is not necessary for the MOS (ds == NULL), 534 * because the MOS is only updated in syncing context. 535 * This is most fortunate: the MOS is the only objset that 536 * needs to be synced multiple times as spa_sync() iterates 537 * to convergence, so minimizing its dn_nlevels matters. 538 */ 539 if (ds != NULL) { 540 int levels = 1; 541 542 /* 543 * Determine the number of levels necessary for the meta-dnode 544 * to contain DN_MAX_OBJECT dnodes. 545 */ 546 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 547 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 548 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 549 levels++; 550 551 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 552 mdn->dn_nlevels = levels; 553 } 554 555 ASSERT(type != DMU_OST_NONE); 556 ASSERT(type != DMU_OST_ANY); 557 ASSERT(type < DMU_OST_NUMTYPES); 558 os->os_phys->os_type = type; 559 if (dmu_objset_userused_enabled(os)) { 560 os->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 561 os->os_flags = os->os_phys->os_flags; 562 } 563 564 dsl_dataset_dirty(ds, tx); 565 566 return (os); 567 } 568 569 struct oscarg { 570 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); 571 void *userarg; 572 dsl_dataset_t *clone_origin; 573 const char *lastname; 574 dmu_objset_type_t type; 575 uint64_t flags; 576 }; 577 578 /*ARGSUSED*/ 579 static int 580 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) 581 { 582 dsl_dir_t *dd = arg1; 583 struct oscarg *oa = arg2; 584 objset_t *mos = dd->dd_pool->dp_meta_objset; 585 int err; 586 uint64_t ddobj; 587 588 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 589 oa->lastname, sizeof (uint64_t), 1, &ddobj); 590 if (err != ENOENT) 591 return (err ? err : EEXIST); 592 593 if (oa->clone_origin != NULL) { 594 /* You can't clone across pools. */ 595 if (oa->clone_origin->ds_dir->dd_pool != dd->dd_pool) 596 return (EXDEV); 597 598 /* You can only clone snapshots, not the head datasets. */ 599 if (!dsl_dataset_is_snapshot(oa->clone_origin)) 600 return (EINVAL); 601 } 602 603 return (0); 604 } 605 606 static void 607 dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 608 { 609 dsl_dir_t *dd = arg1; 610 struct oscarg *oa = arg2; 611 uint64_t dsobj; 612 613 ASSERT(dmu_tx_is_syncing(tx)); 614 615 dsobj = dsl_dataset_create_sync(dd, oa->lastname, 616 oa->clone_origin, oa->flags, cr, tx); 617 618 if (oa->clone_origin == NULL) { 619 dsl_dataset_t *ds; 620 blkptr_t *bp; 621 objset_t *os; 622 623 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj, 624 FTAG, &ds)); 625 bp = dsl_dataset_get_blkptr(ds); 626 ASSERT(BP_IS_HOLE(bp)); 627 628 os = dmu_objset_create_impl(dsl_dataset_get_spa(ds), 629 ds, bp, oa->type, tx); 630 631 if (oa->userfunc) 632 oa->userfunc(os, oa->userarg, cr, tx); 633 dsl_dataset_rele(ds, FTAG); 634 } 635 636 spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa, 637 tx, cr, "dataset = %llu", dsobj); 638 } 639 640 int 641 dmu_objset_create(const char *name, dmu_objset_type_t type, uint64_t flags, 642 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 643 { 644 dsl_dir_t *pdd; 645 const char *tail; 646 int err = 0; 647 struct oscarg oa = { 0 }; 648 649 ASSERT(strchr(name, '@') == NULL); 650 err = dsl_dir_open(name, FTAG, &pdd, &tail); 651 if (err) 652 return (err); 653 if (tail == NULL) { 654 dsl_dir_close(pdd, FTAG); 655 return (EEXIST); 656 } 657 658 oa.userfunc = func; 659 oa.userarg = arg; 660 oa.lastname = tail; 661 oa.type = type; 662 oa.flags = flags; 663 664 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 665 dmu_objset_create_sync, pdd, &oa, 5); 666 dsl_dir_close(pdd, FTAG); 667 return (err); 668 } 669 670 int 671 dmu_objset_clone(const char *name, dsl_dataset_t *clone_origin, uint64_t flags) 672 { 673 dsl_dir_t *pdd; 674 const char *tail; 675 int err = 0; 676 struct oscarg oa = { 0 }; 677 678 ASSERT(strchr(name, '@') == NULL); 679 err = dsl_dir_open(name, FTAG, &pdd, &tail); 680 if (err) 681 return (err); 682 if (tail == NULL) { 683 dsl_dir_close(pdd, FTAG); 684 return (EEXIST); 685 } 686 687 oa.lastname = tail; 688 oa.clone_origin = clone_origin; 689 oa.flags = flags; 690 691 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 692 dmu_objset_create_sync, pdd, &oa, 5); 693 dsl_dir_close(pdd, FTAG); 694 return (err); 695 } 696 697 int 698 dmu_objset_destroy(const char *name, boolean_t defer) 699 { 700 dsl_dataset_t *ds; 701 int error; 702 703 /* 704 * dsl_dataset_destroy() can free any claimed-but-unplayed 705 * intent log, but if there is an active log, it has blocks that 706 * are allocated, but may not yet be reflected in the on-disk 707 * structure. Only the ZIL knows how to free them, so we have 708 * to call into it here. 709 */ 710 error = dsl_dataset_own(name, B_TRUE, FTAG, &ds); 711 if (error == 0) { 712 objset_t *os; 713 if (dmu_objset_from_ds(ds, &os) == 0) 714 zil_destroy(dmu_objset_zil(os), B_FALSE); 715 error = dsl_dataset_destroy(ds, FTAG, defer); 716 /* dsl_dataset_destroy() closes the ds. */ 717 } 718 719 return (error); 720 } 721 722 struct snaparg { 723 dsl_sync_task_group_t *dstg; 724 char *snapname; 725 char failed[MAXPATHLEN]; 726 boolean_t checkperms; 727 nvlist_t *props; 728 }; 729 730 static int 731 snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 732 { 733 objset_t *os = arg1; 734 struct snaparg *sn = arg2; 735 736 /* The props have already been checked by zfs_check_userprops(). */ 737 738 return (dsl_dataset_snapshot_check(os->os_dsl_dataset, 739 sn->snapname, tx)); 740 } 741 742 static void 743 snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 744 { 745 objset_t *os = arg1; 746 dsl_dataset_t *ds = os->os_dsl_dataset; 747 struct snaparg *sn = arg2; 748 749 dsl_dataset_snapshot_sync(ds, sn->snapname, cr, tx); 750 751 if (sn->props) 752 dsl_props_set_sync(ds->ds_prev, sn->props, cr, tx); 753 } 754 755 static int 756 dmu_objset_snapshot_one(char *name, void *arg) 757 { 758 struct snaparg *sn = arg; 759 objset_t *os; 760 int err; 761 762 (void) strcpy(sn->failed, name); 763 764 /* 765 * Check permissions only when requested. This only applies when 766 * doing a recursive snapshot. The permission checks for the starting 767 * dataset have already been performed in zfs_secpolicy_snapshot() 768 */ 769 if (sn->checkperms == B_TRUE && 770 (err = zfs_secpolicy_snapshot_perms(name, CRED()))) 771 return (err); 772 773 err = dmu_objset_hold(name, sn, &os); 774 if (err != 0) 775 return (err); 776 777 /* If the objset is in an inconsistent state, return busy */ 778 if (os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) { 779 dmu_objset_rele(os, sn); 780 return (EBUSY); 781 } 782 783 /* 784 * NB: we need to wait for all in-flight changes to get to disk, 785 * so that we snapshot those changes. zil_suspend does this as 786 * a side effect. 787 */ 788 err = zil_suspend(dmu_objset_zil(os)); 789 if (err == 0) { 790 dsl_sync_task_create(sn->dstg, snapshot_check, 791 snapshot_sync, os, sn, 3); 792 } else { 793 dmu_objset_rele(os, sn); 794 } 795 796 return (err); 797 } 798 799 int 800 dmu_objset_snapshot(char *fsname, char *snapname, 801 nvlist_t *props, boolean_t recursive) 802 { 803 dsl_sync_task_t *dst; 804 struct snaparg sn; 805 spa_t *spa; 806 int err; 807 808 (void) strcpy(sn.failed, fsname); 809 810 err = spa_open(fsname, &spa, FTAG); 811 if (err) 812 return (err); 813 814 sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 815 sn.snapname = snapname; 816 sn.props = props; 817 818 if (recursive) { 819 sn.checkperms = B_TRUE; 820 err = dmu_objset_find(fsname, 821 dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); 822 } else { 823 sn.checkperms = B_FALSE; 824 err = dmu_objset_snapshot_one(fsname, &sn); 825 } 826 827 if (err == 0) 828 err = dsl_sync_task_group_wait(sn.dstg); 829 830 for (dst = list_head(&sn.dstg->dstg_tasks); dst; 831 dst = list_next(&sn.dstg->dstg_tasks, dst)) { 832 objset_t *os = dst->dst_arg1; 833 dsl_dataset_t *ds = os->os_dsl_dataset; 834 if (dst->dst_err) 835 dsl_dataset_name(ds, sn.failed); 836 zil_resume(dmu_objset_zil(os)); 837 dmu_objset_rele(os, &sn); 838 } 839 840 if (err) 841 (void) strcpy(fsname, sn.failed); 842 dsl_sync_task_group_destroy(sn.dstg); 843 spa_close(spa, FTAG); 844 return (err); 845 } 846 847 static void 848 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) 849 { 850 dnode_t *dn; 851 852 while (dn = list_head(list)) { 853 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 854 ASSERT(dn->dn_dbuf->db_data_pending); 855 /* 856 * Initialize dn_zio outside dnode_sync() because the 857 * meta-dnode needs to set it ouside dnode_sync(). 858 */ 859 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 860 ASSERT(dn->dn_zio); 861 862 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 863 list_remove(list, dn); 864 865 if (newlist) { 866 (void) dnode_add_ref(dn, newlist); 867 list_insert_tail(newlist, dn); 868 } 869 870 dnode_sync(dn, tx); 871 } 872 } 873 874 /* ARGSUSED */ 875 static void 876 ready(zio_t *zio, arc_buf_t *abuf, void *arg) 877 { 878 blkptr_t *bp = zio->io_bp; 879 blkptr_t *bp_orig = &zio->io_bp_orig; 880 objset_t *os = arg; 881 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 882 883 ASSERT(bp == os->os_rootbp); 884 ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET); 885 ASSERT(BP_GET_LEVEL(bp) == 0); 886 887 /* 888 * Update rootbp fill count: it should be the number of objects 889 * allocated in the object set (not counting the "special" 890 * objects that are stored in the objset_phys_t -- the meta 891 * dnode and user/group accounting objects). 892 */ 893 bp->blk_fill = 0; 894 for (int i = 0; i < dnp->dn_nblkptr; i++) 895 bp->blk_fill += dnp->dn_blkptr[i].blk_fill; 896 897 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 898 ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig))); 899 } else { 900 if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg) 901 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 902 &zio->io_bp_orig, zio, os->os_synctx); 903 dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx); 904 } 905 } 906 907 /* called from dsl */ 908 void 909 dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) 910 { 911 int txgoff; 912 zbookmark_t zb; 913 writeprops_t wp = { 0 }; 914 zio_t *zio; 915 list_t *list; 916 list_t *newlist = NULL; 917 dbuf_dirty_record_t *dr; 918 919 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 920 921 ASSERT(dmu_tx_is_syncing(tx)); 922 /* XXX the write_done callback should really give us the tx... */ 923 os->os_synctx = tx; 924 925 if (os->os_dsl_dataset == NULL) { 926 /* 927 * This is the MOS. If we have upgraded, 928 * spa_max_replication() could change, so reset 929 * os_copies here. 930 */ 931 os->os_copies = spa_max_replication(os->os_spa); 932 } 933 934 /* 935 * Create the root block IO 936 */ 937 zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 938 zb.zb_object = 0; 939 zb.zb_level = -1; /* for block ordering; it's level 0 on disk */ 940 zb.zb_blkid = 0; 941 942 wp.wp_type = DMU_OT_OBJSET; 943 wp.wp_level = 0; /* on-disk BP level; see above */ 944 wp.wp_copies = os->os_copies; 945 wp.wp_oschecksum = os->os_checksum; 946 wp.wp_oscompress = os->os_compress; 947 948 if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) { 949 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 950 os->os_rootbp, pio, tx); 951 } 952 953 arc_release(os->os_phys_buf, &os->os_phys_buf); 954 955 zio = arc_write(pio, os->os_spa, &wp, DMU_OS_IS_L2CACHEABLE(os), 956 tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, NULL, os, 957 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 958 959 /* 960 * Sync special dnodes - the parent IO for the sync is the root block 961 */ 962 os->os_meta_dnode->dn_zio = zio; 963 dnode_sync(os->os_meta_dnode, tx); 964 965 os->os_phys->os_flags = os->os_flags; 966 967 if (os->os_userused_dnode && 968 os->os_userused_dnode->dn_type != DMU_OT_NONE) { 969 os->os_userused_dnode->dn_zio = zio; 970 dnode_sync(os->os_userused_dnode, tx); 971 os->os_groupused_dnode->dn_zio = zio; 972 dnode_sync(os->os_groupused_dnode, tx); 973 } 974 975 txgoff = tx->tx_txg & TXG_MASK; 976 977 if (dmu_objset_userused_enabled(os)) { 978 newlist = &os->os_synced_dnodes; 979 /* 980 * We must create the list here because it uses the 981 * dn_dirty_link[] of this txg. 982 */ 983 list_create(newlist, sizeof (dnode_t), 984 offsetof(dnode_t, dn_dirty_link[txgoff])); 985 } 986 987 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); 988 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); 989 990 list = &os->os_meta_dnode->dn_dirty_records[txgoff]; 991 while (dr = list_head(list)) { 992 ASSERT(dr->dr_dbuf->db_level == 0); 993 list_remove(list, dr); 994 if (dr->dr_zio) 995 zio_nowait(dr->dr_zio); 996 } 997 /* 998 * Free intent log blocks up to this tx. 999 */ 1000 zil_sync(os->os_zil, tx); 1001 os->os_phys->os_zil_header = os->os_zil_header; 1002 zio_nowait(zio); 1003 } 1004 1005 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1006 1007 void 1008 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1009 { 1010 used_cbs[ost] = cb; 1011 } 1012 1013 boolean_t 1014 dmu_objset_userused_enabled(objset_t *os) 1015 { 1016 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1017 used_cbs[os->os_phys->os_type] && 1018 os->os_userused_dnode); 1019 } 1020 1021 static void 1022 do_userquota_callback(objset_t *os, dnode_phys_t *dnp, 1023 boolean_t subtract, dmu_tx_t *tx) 1024 { 1025 static const char zerobuf[DN_MAX_BONUSLEN] = {0}; 1026 uint64_t user, group; 1027 1028 ASSERT(dnp->dn_type != 0 || 1029 (bcmp(DN_BONUS(dnp), zerobuf, DN_MAX_BONUSLEN) == 0 && 1030 DN_USED_BYTES(dnp) == 0)); 1031 1032 if ((dnp->dn_flags & DNODE_FLAG_USERUSED_ACCOUNTED) && 1033 0 == used_cbs[os->os_phys->os_type](dnp->dn_bonustype, 1034 DN_BONUS(dnp), &user, &group)) { 1035 int64_t delta = DNODE_SIZE + DN_USED_BYTES(dnp); 1036 if (subtract) 1037 delta = -delta; 1038 VERIFY3U(0, ==, zap_increment_int(os, DMU_USERUSED_OBJECT, 1039 user, delta, tx)); 1040 VERIFY3U(0, ==, zap_increment_int(os, DMU_GROUPUSED_OBJECT, 1041 group, delta, tx)); 1042 } 1043 } 1044 1045 void 1046 dmu_objset_do_userquota_callbacks(objset_t *os, dmu_tx_t *tx) 1047 { 1048 dnode_t *dn; 1049 list_t *list = &os->os_synced_dnodes; 1050 1051 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); 1052 1053 while (dn = list_head(list)) { 1054 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1055 ASSERT(dn->dn_oldphys); 1056 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1057 dn->dn_phys->dn_flags & 1058 DNODE_FLAG_USERUSED_ACCOUNTED); 1059 1060 /* Allocate the user/groupused objects if necessary. */ 1061 if (os->os_userused_dnode->dn_type == DMU_OT_NONE) { 1062 VERIFY(0 == zap_create_claim(os, 1063 DMU_USERUSED_OBJECT, 1064 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1065 VERIFY(0 == zap_create_claim(os, 1066 DMU_GROUPUSED_OBJECT, 1067 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1068 } 1069 1070 /* 1071 * We intentionally modify the zap object even if the 1072 * net delta (due to phys-oldphys) is zero. Otherwise 1073 * the block of the zap obj could be shared between 1074 * datasets but need to be different between them after 1075 * a bprewrite. 1076 */ 1077 do_userquota_callback(os, dn->dn_oldphys, B_TRUE, tx); 1078 do_userquota_callback(os, dn->dn_phys, B_FALSE, tx); 1079 1080 /* 1081 * The mutex is needed here for interlock with dnode_allocate. 1082 */ 1083 mutex_enter(&dn->dn_mtx); 1084 zio_buf_free(dn->dn_oldphys, sizeof (dnode_phys_t)); 1085 dn->dn_oldphys = NULL; 1086 mutex_exit(&dn->dn_mtx); 1087 1088 list_remove(list, dn); 1089 dnode_rele(dn, list); 1090 } 1091 } 1092 1093 boolean_t 1094 dmu_objset_userspace_present(objset_t *os) 1095 { 1096 return (os->os_phys->os_flags & 1097 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1098 } 1099 1100 int 1101 dmu_objset_userspace_upgrade(objset_t *os) 1102 { 1103 uint64_t obj; 1104 int err = 0; 1105 1106 if (dmu_objset_userspace_present(os)) 1107 return (0); 1108 if (!dmu_objset_userused_enabled(os)) 1109 return (ENOTSUP); 1110 if (dmu_objset_is_snapshot(os)) 1111 return (EINVAL); 1112 1113 /* 1114 * We simply need to mark every object dirty, so that it will be 1115 * synced out and now accounted. If this is called 1116 * concurrently, or if we already did some work before crashing, 1117 * that's fine, since we track each object's accounted state 1118 * independently. 1119 */ 1120 1121 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1122 dmu_tx_t *tx; 1123 dmu_buf_t *db; 1124 int objerr; 1125 1126 if (issig(JUSTLOOKING) && issig(FORREAL)) 1127 return (EINTR); 1128 1129 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1130 if (objerr) 1131 continue; 1132 tx = dmu_tx_create(os); 1133 dmu_tx_hold_bonus(tx, obj); 1134 objerr = dmu_tx_assign(tx, TXG_WAIT); 1135 if (objerr) { 1136 dmu_tx_abort(tx); 1137 continue; 1138 } 1139 dmu_buf_will_dirty(db, tx); 1140 dmu_buf_rele(db, FTAG); 1141 dmu_tx_commit(tx); 1142 } 1143 1144 os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1145 txg_wait_synced(dmu_objset_pool(os), 0); 1146 return (0); 1147 } 1148 1149 void 1150 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1151 uint64_t *usedobjsp, uint64_t *availobjsp) 1152 { 1153 dsl_dataset_space(os->os_dsl_dataset, refdbytesp, availbytesp, 1154 usedobjsp, availobjsp); 1155 } 1156 1157 uint64_t 1158 dmu_objset_fsid_guid(objset_t *os) 1159 { 1160 return (dsl_dataset_fsid_guid(os->os_dsl_dataset)); 1161 } 1162 1163 void 1164 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1165 { 1166 stat->dds_type = os->os_phys->os_type; 1167 if (os->os_dsl_dataset) 1168 dsl_dataset_fast_stat(os->os_dsl_dataset, stat); 1169 } 1170 1171 void 1172 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1173 { 1174 ASSERT(os->os_dsl_dataset || 1175 os->os_phys->os_type == DMU_OST_META); 1176 1177 if (os->os_dsl_dataset != NULL) 1178 dsl_dataset_stats(os->os_dsl_dataset, nv); 1179 1180 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1181 os->os_phys->os_type); 1182 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1183 dmu_objset_userspace_present(os)); 1184 } 1185 1186 int 1187 dmu_objset_is_snapshot(objset_t *os) 1188 { 1189 if (os->os_dsl_dataset != NULL) 1190 return (dsl_dataset_is_snapshot(os->os_dsl_dataset)); 1191 else 1192 return (B_FALSE); 1193 } 1194 1195 int 1196 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1197 boolean_t *conflict) 1198 { 1199 dsl_dataset_t *ds = os->os_dsl_dataset; 1200 uint64_t ignored; 1201 1202 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1203 return (ENOENT); 1204 1205 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1206 ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST, 1207 real, maxlen, conflict)); 1208 } 1209 1210 int 1211 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1212 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1213 { 1214 dsl_dataset_t *ds = os->os_dsl_dataset; 1215 zap_cursor_t cursor; 1216 zap_attribute_t attr; 1217 1218 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1219 return (ENOENT); 1220 1221 zap_cursor_init_serialized(&cursor, 1222 ds->ds_dir->dd_pool->dp_meta_objset, 1223 ds->ds_phys->ds_snapnames_zapobj, *offp); 1224 1225 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1226 zap_cursor_fini(&cursor); 1227 return (ENOENT); 1228 } 1229 1230 if (strlen(attr.za_name) + 1 > namelen) { 1231 zap_cursor_fini(&cursor); 1232 return (ENAMETOOLONG); 1233 } 1234 1235 (void) strcpy(name, attr.za_name); 1236 if (idp) 1237 *idp = attr.za_first_integer; 1238 if (case_conflict) 1239 *case_conflict = attr.za_normalization_conflict; 1240 zap_cursor_advance(&cursor); 1241 *offp = zap_cursor_serialize(&cursor); 1242 zap_cursor_fini(&cursor); 1243 1244 return (0); 1245 } 1246 1247 int 1248 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1249 uint64_t *idp, uint64_t *offp) 1250 { 1251 dsl_dir_t *dd = os->os_dsl_dataset->ds_dir; 1252 zap_cursor_t cursor; 1253 zap_attribute_t attr; 1254 1255 /* there is no next dir on a snapshot! */ 1256 if (os->os_dsl_dataset->ds_object != 1257 dd->dd_phys->dd_head_dataset_obj) 1258 return (ENOENT); 1259 1260 zap_cursor_init_serialized(&cursor, 1261 dd->dd_pool->dp_meta_objset, 1262 dd->dd_phys->dd_child_dir_zapobj, *offp); 1263 1264 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1265 zap_cursor_fini(&cursor); 1266 return (ENOENT); 1267 } 1268 1269 if (strlen(attr.za_name) + 1 > namelen) { 1270 zap_cursor_fini(&cursor); 1271 return (ENAMETOOLONG); 1272 } 1273 1274 (void) strcpy(name, attr.za_name); 1275 if (idp) 1276 *idp = attr.za_first_integer; 1277 zap_cursor_advance(&cursor); 1278 *offp = zap_cursor_serialize(&cursor); 1279 zap_cursor_fini(&cursor); 1280 1281 return (0); 1282 } 1283 1284 struct findarg { 1285 int (*func)(char *, void *); 1286 void *arg; 1287 }; 1288 1289 /* ARGSUSED */ 1290 static int 1291 findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) 1292 { 1293 struct findarg *fa = arg; 1294 return (fa->func((char *)dsname, fa->arg)); 1295 } 1296 1297 /* 1298 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1299 * Perhaps change all callers to use dmu_objset_find_spa()? 1300 */ 1301 int 1302 dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags) 1303 { 1304 struct findarg fa; 1305 fa.func = func; 1306 fa.arg = arg; 1307 return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags)); 1308 } 1309 1310 /* 1311 * Find all objsets under name, call func on each 1312 */ 1313 int 1314 dmu_objset_find_spa(spa_t *spa, const char *name, 1315 int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags) 1316 { 1317 dsl_dir_t *dd; 1318 dsl_pool_t *dp; 1319 dsl_dataset_t *ds; 1320 zap_cursor_t zc; 1321 zap_attribute_t *attr; 1322 char *child; 1323 uint64_t thisobj; 1324 int err; 1325 1326 if (name == NULL) 1327 name = spa_name(spa); 1328 err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL); 1329 if (err) 1330 return (err); 1331 1332 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1333 if (dd->dd_myname[0] == '$') { 1334 dsl_dir_close(dd, FTAG); 1335 return (0); 1336 } 1337 1338 thisobj = dd->dd_phys->dd_head_dataset_obj; 1339 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1340 dp = dd->dd_pool; 1341 1342 /* 1343 * Iterate over all children. 1344 */ 1345 if (flags & DS_FIND_CHILDREN) { 1346 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1347 dd->dd_phys->dd_child_dir_zapobj); 1348 zap_cursor_retrieve(&zc, attr) == 0; 1349 (void) zap_cursor_advance(&zc)) { 1350 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 1351 ASSERT(attr->za_num_integers == 1); 1352 1353 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1354 (void) strcpy(child, name); 1355 (void) strcat(child, "/"); 1356 (void) strcat(child, attr->za_name); 1357 err = dmu_objset_find_spa(spa, child, func, arg, flags); 1358 kmem_free(child, MAXPATHLEN); 1359 if (err) 1360 break; 1361 } 1362 zap_cursor_fini(&zc); 1363 1364 if (err) { 1365 dsl_dir_close(dd, FTAG); 1366 kmem_free(attr, sizeof (zap_attribute_t)); 1367 return (err); 1368 } 1369 } 1370 1371 /* 1372 * Iterate over all snapshots. 1373 */ 1374 if (flags & DS_FIND_SNAPSHOTS) { 1375 if (!dsl_pool_sync_context(dp)) 1376 rw_enter(&dp->dp_config_rwlock, RW_READER); 1377 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1378 if (!dsl_pool_sync_context(dp)) 1379 rw_exit(&dp->dp_config_rwlock); 1380 1381 if (err == 0) { 1382 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 1383 dsl_dataset_rele(ds, FTAG); 1384 1385 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1386 zap_cursor_retrieve(&zc, attr) == 0; 1387 (void) zap_cursor_advance(&zc)) { 1388 ASSERT(attr->za_integer_length == 1389 sizeof (uint64_t)); 1390 ASSERT(attr->za_num_integers == 1); 1391 1392 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1393 (void) strcpy(child, name); 1394 (void) strcat(child, "@"); 1395 (void) strcat(child, attr->za_name); 1396 err = func(spa, attr->za_first_integer, 1397 child, arg); 1398 kmem_free(child, MAXPATHLEN); 1399 if (err) 1400 break; 1401 } 1402 zap_cursor_fini(&zc); 1403 } 1404 } 1405 1406 dsl_dir_close(dd, FTAG); 1407 kmem_free(attr, sizeof (zap_attribute_t)); 1408 1409 if (err) 1410 return (err); 1411 1412 /* 1413 * Apply to self if appropriate. 1414 */ 1415 err = func(spa, thisobj, name, arg); 1416 return (err); 1417 } 1418 1419 /* ARGSUSED */ 1420 int 1421 dmu_objset_prefetch(char *name, void *arg) 1422 { 1423 dsl_dataset_t *ds; 1424 1425 if (dsl_dataset_hold(name, FTAG, &ds)) 1426 return (0); 1427 1428 if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) { 1429 mutex_enter(&ds->ds_opening_lock); 1430 if (ds->ds_objset == NULL) { 1431 uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1432 zbookmark_t zb; 1433 1434 zb.zb_objset = ds->ds_object; 1435 zb.zb_object = 0; 1436 zb.zb_level = -1; 1437 zb.zb_blkid = 0; 1438 1439 (void) arc_read_nolock(NULL, dsl_dataset_get_spa(ds), 1440 &ds->ds_phys->ds_bp, NULL, NULL, 1441 ZIO_PRIORITY_ASYNC_READ, 1442 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1443 &aflags, &zb); 1444 } 1445 mutex_exit(&ds->ds_opening_lock); 1446 } 1447 1448 dsl_dataset_rele(ds, FTAG); 1449 return (0); 1450 } 1451 1452 void 1453 dmu_objset_set_user(objset_t *os, void *user_ptr) 1454 { 1455 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1456 os->os_user_ptr = user_ptr; 1457 } 1458 1459 void * 1460 dmu_objset_get_user(objset_t *os) 1461 { 1462 ASSERT(MUTEX_HELD(&os->os_user_ptr_lock)); 1463 return (os->os_user_ptr); 1464 } 1465