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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/cred.h> 29 #include <sys/zfs_context.h> 30 #include <sys/dmu_objset.h> 31 #include <sys/dsl_dir.h> 32 #include <sys/dsl_dataset.h> 33 #include <sys/dsl_prop.h> 34 #include <sys/dsl_pool.h> 35 #include <sys/dsl_synctask.h> 36 #include <sys/dsl_deleg.h> 37 #include <sys/dnode.h> 38 #include <sys/dbuf.h> 39 #include <sys/zvol.h> 40 #include <sys/dmu_tx.h> 41 #include <sys/zio_checksum.h> 42 #include <sys/zap.h> 43 #include <sys/zil.h> 44 #include <sys/dmu_impl.h> 45 #include <sys/zfs_ioctl.h> 46 47 48 spa_t * 49 dmu_objset_spa(objset_t *os) 50 { 51 return (os->os->os_spa); 52 } 53 54 zilog_t * 55 dmu_objset_zil(objset_t *os) 56 { 57 return (os->os->os_zil); 58 } 59 60 dsl_pool_t * 61 dmu_objset_pool(objset_t *os) 62 { 63 dsl_dataset_t *ds; 64 65 if ((ds = os->os->os_dsl_dataset) != NULL && ds->ds_dir) 66 return (ds->ds_dir->dd_pool); 67 else 68 return (spa_get_dsl(os->os->os_spa)); 69 } 70 71 dsl_dataset_t * 72 dmu_objset_ds(objset_t *os) 73 { 74 return (os->os->os_dsl_dataset); 75 } 76 77 dmu_objset_type_t 78 dmu_objset_type(objset_t *os) 79 { 80 return (os->os->os_phys->os_type); 81 } 82 83 void 84 dmu_objset_name(objset_t *os, char *buf) 85 { 86 dsl_dataset_name(os->os->os_dsl_dataset, buf); 87 } 88 89 uint64_t 90 dmu_objset_id(objset_t *os) 91 { 92 dsl_dataset_t *ds = os->os->os_dsl_dataset; 93 94 return (ds ? ds->ds_object : 0); 95 } 96 97 static void 98 checksum_changed_cb(void *arg, uint64_t newval) 99 { 100 objset_impl_t *osi = arg; 101 102 /* 103 * Inheritance should have been done by now. 104 */ 105 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 106 107 osi->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 108 } 109 110 static void 111 compression_changed_cb(void *arg, uint64_t newval) 112 { 113 objset_impl_t *osi = arg; 114 115 /* 116 * Inheritance and range checking should have been done by now. 117 */ 118 ASSERT(newval != ZIO_COMPRESS_INHERIT); 119 120 osi->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); 121 } 122 123 static void 124 copies_changed_cb(void *arg, uint64_t newval) 125 { 126 objset_impl_t *osi = arg; 127 128 /* 129 * Inheritance and range checking should have been done by now. 130 */ 131 ASSERT(newval > 0); 132 ASSERT(newval <= spa_max_replication(osi->os_spa)); 133 134 osi->os_copies = newval; 135 } 136 137 void 138 dmu_objset_byteswap(void *buf, size_t size) 139 { 140 objset_phys_t *osp = buf; 141 142 ASSERT(size == sizeof (objset_phys_t)); 143 dnode_byteswap(&osp->os_meta_dnode); 144 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 145 osp->os_type = BSWAP_64(osp->os_type); 146 } 147 148 int 149 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 150 objset_impl_t **osip) 151 { 152 objset_impl_t *osi; 153 int i, err, checksum; 154 155 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 156 157 osi = kmem_zalloc(sizeof (objset_impl_t), KM_SLEEP); 158 osi->os.os = osi; 159 osi->os_dsl_dataset = ds; 160 osi->os_spa = spa; 161 osi->os_rootbp = bp; 162 if (!BP_IS_HOLE(osi->os_rootbp)) { 163 uint32_t aflags = ARC_WAIT; 164 zbookmark_t zb; 165 zb.zb_objset = ds ? ds->ds_object : 0; 166 zb.zb_object = 0; 167 zb.zb_level = -1; 168 zb.zb_blkid = 0; 169 170 dprintf_bp(osi->os_rootbp, "reading %s", ""); 171 err = arc_read(NULL, spa, osi->os_rootbp, 172 dmu_ot[DMU_OT_OBJSET].ot_byteswap, 173 arc_getbuf_func, &osi->os_phys_buf, 174 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 175 if (err) { 176 kmem_free(osi, sizeof (objset_impl_t)); 177 return (err); 178 } 179 osi->os_phys = osi->os_phys_buf->b_data; 180 arc_release(osi->os_phys_buf, &osi->os_phys_buf); 181 } else { 182 osi->os_phys_buf = arc_buf_alloc(spa, sizeof (objset_phys_t), 183 &osi->os_phys_buf, ARC_BUFC_METADATA); 184 osi->os_phys = osi->os_phys_buf->b_data; 185 bzero(osi->os_phys, sizeof (objset_phys_t)); 186 } 187 188 /* 189 * Note: the changed_cb will be called once before the register 190 * func returns, thus changing the checksum/compression from the 191 * default (fletcher2/off). Snapshots don't need to know, and 192 * registering would complicate clone promotion. 193 */ 194 if (ds && ds->ds_phys->ds_num_children == 0) { 195 err = dsl_prop_register(ds, "checksum", 196 checksum_changed_cb, osi); 197 if (err == 0) 198 err = dsl_prop_register(ds, "compression", 199 compression_changed_cb, osi); 200 if (err == 0) 201 err = dsl_prop_register(ds, "copies", 202 copies_changed_cb, osi); 203 if (err) { 204 VERIFY(arc_buf_remove_ref(osi->os_phys_buf, 205 &osi->os_phys_buf) == 1); 206 kmem_free(osi, sizeof (objset_impl_t)); 207 return (err); 208 } 209 } else if (ds == NULL) { 210 /* It's the meta-objset. */ 211 osi->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 212 osi->os_compress = ZIO_COMPRESS_LZJB; 213 osi->os_copies = spa_max_replication(spa); 214 } 215 216 osi->os_zil = zil_alloc(&osi->os, &osi->os_phys->os_zil_header); 217 218 /* 219 * Metadata always gets compressed and checksummed. 220 * If the data checksum is multi-bit correctable, and it's not 221 * a ZBT-style checksum, then it's suitable for metadata as well. 222 * Otherwise, the metadata checksum defaults to fletcher4. 223 */ 224 checksum = osi->os_checksum; 225 226 if (zio_checksum_table[checksum].ci_correctable && 227 !zio_checksum_table[checksum].ci_zbt) 228 osi->os_md_checksum = checksum; 229 else 230 osi->os_md_checksum = ZIO_CHECKSUM_FLETCHER_4; 231 osi->os_md_compress = ZIO_COMPRESS_LZJB; 232 233 for (i = 0; i < TXG_SIZE; i++) { 234 list_create(&osi->os_dirty_dnodes[i], sizeof (dnode_t), 235 offsetof(dnode_t, dn_dirty_link[i])); 236 list_create(&osi->os_free_dnodes[i], sizeof (dnode_t), 237 offsetof(dnode_t, dn_dirty_link[i])); 238 } 239 list_create(&osi->os_dnodes, sizeof (dnode_t), 240 offsetof(dnode_t, dn_link)); 241 list_create(&osi->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 242 offsetof(dmu_buf_impl_t, db_link)); 243 244 mutex_init(&osi->os_lock, NULL, MUTEX_DEFAULT, NULL); 245 mutex_init(&osi->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 246 247 osi->os_meta_dnode = dnode_special_open(osi, 248 &osi->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT); 249 250 /* 251 * We should be the only thread trying to do this because we 252 * have ds_opening_lock 253 */ 254 if (ds) { 255 VERIFY(NULL == dsl_dataset_set_user_ptr(ds, osi, 256 dmu_objset_evict)); 257 } 258 259 *osip = osi; 260 return (0); 261 } 262 263 /* called from zpl */ 264 int 265 dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 266 objset_t **osp) 267 { 268 dsl_dataset_t *ds; 269 int err; 270 objset_t *os; 271 objset_impl_t *osi; 272 273 os = kmem_alloc(sizeof (objset_t), KM_SLEEP); 274 err = dsl_dataset_open(name, mode, os, &ds); 275 if (err) { 276 kmem_free(os, sizeof (objset_t)); 277 return (err); 278 } 279 280 mutex_enter(&ds->ds_opening_lock); 281 osi = dsl_dataset_get_user_ptr(ds); 282 if (osi == NULL) { 283 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 284 ds, &ds->ds_phys->ds_bp, &osi); 285 if (err) { 286 dsl_dataset_close(ds, mode, os); 287 kmem_free(os, sizeof (objset_t)); 288 return (err); 289 } 290 } 291 mutex_exit(&ds->ds_opening_lock); 292 293 os->os = osi; 294 os->os_mode = mode; 295 296 if (type != DMU_OST_ANY && type != os->os->os_phys->os_type) { 297 dmu_objset_close(os); 298 return (EINVAL); 299 } 300 *osp = os; 301 return (0); 302 } 303 304 void 305 dmu_objset_close(objset_t *os) 306 { 307 dsl_dataset_close(os->os->os_dsl_dataset, os->os_mode, os); 308 kmem_free(os, sizeof (objset_t)); 309 } 310 311 int 312 dmu_objset_evict_dbufs(objset_t *os) 313 { 314 objset_impl_t *osi = os->os; 315 dnode_t *dn; 316 317 mutex_enter(&osi->os_lock); 318 319 /* process the mdn last, since the other dnodes have holds on it */ 320 list_remove(&osi->os_dnodes, osi->os_meta_dnode); 321 list_insert_tail(&osi->os_dnodes, osi->os_meta_dnode); 322 323 /* 324 * Find the first dnode with holds. We have to do this dance 325 * because dnode_add_ref() only works if you already have a 326 * hold. If there are no holds then it has no dbufs so OK to 327 * skip. 328 */ 329 for (dn = list_head(&osi->os_dnodes); 330 dn && !dnode_add_ref(dn, FTAG); 331 dn = list_next(&osi->os_dnodes, dn)) 332 continue; 333 334 while (dn) { 335 dnode_t *next_dn = dn; 336 337 do { 338 next_dn = list_next(&osi->os_dnodes, next_dn); 339 } while (next_dn && !dnode_add_ref(next_dn, FTAG)); 340 341 mutex_exit(&osi->os_lock); 342 dnode_evict_dbufs(dn); 343 dnode_rele(dn, FTAG); 344 mutex_enter(&osi->os_lock); 345 dn = next_dn; 346 } 347 mutex_exit(&osi->os_lock); 348 return (list_head(&osi->os_dnodes) != osi->os_meta_dnode); 349 } 350 351 void 352 dmu_objset_evict(dsl_dataset_t *ds, void *arg) 353 { 354 objset_impl_t *osi = arg; 355 objset_t os; 356 int i; 357 358 for (i = 0; i < TXG_SIZE; i++) { 359 ASSERT(list_head(&osi->os_dirty_dnodes[i]) == NULL); 360 ASSERT(list_head(&osi->os_free_dnodes[i]) == NULL); 361 } 362 363 if (ds && ds->ds_phys->ds_num_children == 0) { 364 VERIFY(0 == dsl_prop_unregister(ds, "checksum", 365 checksum_changed_cb, osi)); 366 VERIFY(0 == dsl_prop_unregister(ds, "compression", 367 compression_changed_cb, osi)); 368 VERIFY(0 == dsl_prop_unregister(ds, "copies", 369 copies_changed_cb, osi)); 370 } 371 372 /* 373 * We should need only a single pass over the dnode list, since 374 * nothing can be added to the list at this point. 375 */ 376 os.os = osi; 377 (void) dmu_objset_evict_dbufs(&os); 378 379 ASSERT3P(list_head(&osi->os_dnodes), ==, osi->os_meta_dnode); 380 ASSERT3P(list_tail(&osi->os_dnodes), ==, osi->os_meta_dnode); 381 ASSERT3P(list_head(&osi->os_meta_dnode->dn_dbufs), ==, NULL); 382 383 dnode_special_close(osi->os_meta_dnode); 384 zil_free(osi->os_zil); 385 386 VERIFY(arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf) == 1); 387 mutex_destroy(&osi->os_lock); 388 mutex_destroy(&osi->os_obj_lock); 389 kmem_free(osi, sizeof (objset_impl_t)); 390 } 391 392 /* called from dsl for meta-objset */ 393 objset_impl_t * 394 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 395 dmu_objset_type_t type, dmu_tx_t *tx) 396 { 397 objset_impl_t *osi; 398 dnode_t *mdn; 399 400 ASSERT(dmu_tx_is_syncing(tx)); 401 if (ds) 402 mutex_enter(&ds->ds_opening_lock); 403 VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &osi)); 404 if (ds) 405 mutex_exit(&ds->ds_opening_lock); 406 mdn = osi->os_meta_dnode; 407 408 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 409 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 410 411 /* 412 * We don't want to have to increase the meta-dnode's nlevels 413 * later, because then we could do it in quescing context while 414 * we are also accessing it in open context. 415 * 416 * This precaution is not necessary for the MOS (ds == NULL), 417 * because the MOS is only updated in syncing context. 418 * This is most fortunate: the MOS is the only objset that 419 * needs to be synced multiple times as spa_sync() iterates 420 * to convergence, so minimizing its dn_nlevels matters. 421 */ 422 if (ds != NULL) { 423 int levels = 1; 424 425 /* 426 * Determine the number of levels necessary for the meta-dnode 427 * to contain DN_MAX_OBJECT dnodes. 428 */ 429 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 430 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 431 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 432 levels++; 433 434 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 435 mdn->dn_nlevels = levels; 436 } 437 438 ASSERT(type != DMU_OST_NONE); 439 ASSERT(type != DMU_OST_ANY); 440 ASSERT(type < DMU_OST_NUMTYPES); 441 osi->os_phys->os_type = type; 442 443 dsl_dataset_dirty(ds, tx); 444 445 return (osi); 446 } 447 448 struct oscarg { 449 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); 450 void *userarg; 451 dsl_dataset_t *clone_parent; 452 const char *lastname; 453 dmu_objset_type_t type; 454 }; 455 456 /*ARGSUSED*/ 457 static int 458 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) 459 { 460 dsl_dir_t *dd = arg1; 461 struct oscarg *oa = arg2; 462 objset_t *mos = dd->dd_pool->dp_meta_objset; 463 int err; 464 uint64_t ddobj; 465 466 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 467 oa->lastname, sizeof (uint64_t), 1, &ddobj); 468 if (err != ENOENT) 469 return (err ? err : EEXIST); 470 471 if (oa->clone_parent != NULL) { 472 /* 473 * You can't clone across pools. 474 */ 475 if (oa->clone_parent->ds_dir->dd_pool != dd->dd_pool) 476 return (EXDEV); 477 478 /* 479 * You can only clone snapshots, not the head datasets. 480 */ 481 if (oa->clone_parent->ds_phys->ds_num_children == 0) 482 return (EINVAL); 483 } 484 485 return (0); 486 } 487 488 static void 489 dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 490 { 491 dsl_dir_t *dd = arg1; 492 struct oscarg *oa = arg2; 493 dsl_dataset_t *ds; 494 blkptr_t *bp; 495 uint64_t dsobj; 496 497 ASSERT(dmu_tx_is_syncing(tx)); 498 499 dsobj = dsl_dataset_create_sync(dd, oa->lastname, 500 oa->clone_parent, tx); 501 502 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dsobj, NULL, 503 DS_MODE_STANDARD | DS_MODE_READONLY, FTAG, &ds)); 504 bp = dsl_dataset_get_blkptr(ds); 505 if (BP_IS_HOLE(bp)) { 506 objset_impl_t *osi; 507 508 /* This is an empty dmu_objset; not a clone. */ 509 osi = dmu_objset_create_impl(dsl_dataset_get_spa(ds), 510 ds, bp, oa->type, tx); 511 512 if (oa->userfunc) 513 oa->userfunc(&osi->os, oa->userarg, cr, tx); 514 } 515 516 /* 517 * Create create time permission if any? 518 */ 519 dsl_deleg_set_create_perms(ds->ds_dir, tx, cr); 520 521 spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa, 522 tx, cr, "dataset = %llu", dsobj); 523 524 dsl_dataset_close(ds, DS_MODE_STANDARD | DS_MODE_READONLY, FTAG); 525 } 526 527 int 528 dmu_objset_create(const char *name, dmu_objset_type_t type, 529 objset_t *clone_parent, 530 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 531 { 532 dsl_dir_t *pdd; 533 const char *tail; 534 int err = 0; 535 struct oscarg oa = { 0 }; 536 537 ASSERT(strchr(name, '@') == NULL); 538 err = dsl_dir_open(name, FTAG, &pdd, &tail); 539 if (err) 540 return (err); 541 if (tail == NULL) { 542 dsl_dir_close(pdd, FTAG); 543 return (EEXIST); 544 } 545 546 dprintf("name=%s\n", name); 547 548 oa.userfunc = func; 549 oa.userarg = arg; 550 oa.lastname = tail; 551 oa.type = type; 552 553 if (clone_parent != NULL) { 554 /* 555 * You can't clone to a different type. 556 */ 557 if (clone_parent->os->os_phys->os_type != type) { 558 dsl_dir_close(pdd, FTAG); 559 return (EINVAL); 560 } 561 oa.clone_parent = clone_parent->os->os_dsl_dataset; 562 } 563 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 564 dmu_objset_create_sync, pdd, &oa, 5); 565 dsl_dir_close(pdd, FTAG); 566 return (err); 567 } 568 569 int 570 dmu_objset_destroy(const char *name) 571 { 572 objset_t *os; 573 int error; 574 575 /* 576 * If it looks like we'll be able to destroy it, and there's 577 * an unplayed replay log sitting around, destroy the log. 578 * It would be nicer to do this in dsl_dataset_destroy_sync(), 579 * but the replay log objset is modified in open context. 580 */ 581 error = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_EXCLUSIVE, &os); 582 if (error == 0) { 583 zil_destroy(dmu_objset_zil(os), B_FALSE); 584 dmu_objset_close(os); 585 } 586 587 return (dsl_dataset_destroy(name)); 588 } 589 590 int 591 dmu_objset_rollback(const char *name) 592 { 593 int err; 594 objset_t *os; 595 596 err = dmu_objset_open(name, DMU_OST_ANY, 597 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); 598 if (err) 599 return (err); 600 601 /* XXX uncache everything? */ 602 err = dsl_dataset_rollback(os->os->os_dsl_dataset); 603 604 dmu_objset_close(os); 605 return (err); 606 } 607 608 struct snaparg { 609 dsl_sync_task_group_t *dstg; 610 char *snapname; 611 char failed[MAXPATHLEN]; 612 boolean_t checkperms; 613 }; 614 615 static int 616 dmu_objset_snapshot_one(char *name, void *arg) 617 { 618 struct snaparg *sn = arg; 619 objset_t *os; 620 dmu_objset_stats_t stat; 621 int err; 622 623 (void) strcpy(sn->failed, name); 624 625 /* 626 * Check permissions only when requested. This only applies when 627 * doing a recursive snapshot. The permission checks for the starting 628 * dataset have already been performed in zfs_secpolicy_snapshot() 629 */ 630 if (sn->checkperms == B_TRUE && 631 (err = zfs_secpolicy_snapshot_perms(name, CRED()))) 632 return (err); 633 634 err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_STANDARD, &os); 635 if (err != 0) 636 return (err); 637 638 /* 639 * If the objset is in an inconsistent state, return busy. 640 */ 641 dmu_objset_fast_stat(os, &stat); 642 if (stat.dds_inconsistent) { 643 dmu_objset_close(os); 644 return (EBUSY); 645 } 646 647 /* 648 * NB: we need to wait for all in-flight changes to get to disk, 649 * so that we snapshot those changes. zil_suspend does this as 650 * a side effect. 651 */ 652 err = zil_suspend(dmu_objset_zil(os)); 653 if (err == 0) { 654 dsl_sync_task_create(sn->dstg, dsl_dataset_snapshot_check, 655 dsl_dataset_snapshot_sync, os, sn->snapname, 3); 656 } else { 657 dmu_objset_close(os); 658 } 659 660 return (err); 661 } 662 663 int 664 dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive) 665 { 666 dsl_sync_task_t *dst; 667 struct snaparg sn = { 0 }; 668 spa_t *spa; 669 int err; 670 671 (void) strcpy(sn.failed, fsname); 672 673 err = spa_open(fsname, &spa, FTAG); 674 if (err) 675 return (err); 676 677 sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 678 sn.snapname = snapname; 679 680 if (recursive) { 681 sn.checkperms = B_TRUE; 682 err = dmu_objset_find(fsname, 683 dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); 684 } else { 685 sn.checkperms = B_FALSE; 686 err = dmu_objset_snapshot_one(fsname, &sn); 687 } 688 689 if (err) 690 goto out; 691 692 err = dsl_sync_task_group_wait(sn.dstg); 693 694 for (dst = list_head(&sn.dstg->dstg_tasks); dst; 695 dst = list_next(&sn.dstg->dstg_tasks, dst)) { 696 objset_t *os = dst->dst_arg1; 697 if (dst->dst_err) 698 dmu_objset_name(os, sn.failed); 699 zil_resume(dmu_objset_zil(os)); 700 dmu_objset_close(os); 701 } 702 out: 703 if (err) 704 (void) strcpy(fsname, sn.failed); 705 dsl_sync_task_group_destroy(sn.dstg); 706 spa_close(spa, FTAG); 707 return (err); 708 } 709 710 static void 711 dmu_objset_sync_dnodes(list_t *list, dmu_tx_t *tx) 712 { 713 dnode_t *dn; 714 715 while (dn = list_head(list)) { 716 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 717 ASSERT(dn->dn_dbuf->db_data_pending); 718 /* 719 * Initialize dn_zio outside dnode_sync() 720 * to accomodate meta-dnode 721 */ 722 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 723 ASSERT(dn->dn_zio); 724 725 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 726 list_remove(list, dn); 727 dnode_sync(dn, tx); 728 } 729 } 730 731 /* ARGSUSED */ 732 static void 733 ready(zio_t *zio, arc_buf_t *abuf, void *arg) 734 { 735 objset_impl_t *os = arg; 736 blkptr_t *bp = os->os_rootbp; 737 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 738 int i; 739 740 /* 741 * Update rootbp fill count. 742 */ 743 bp->blk_fill = 1; /* count the meta-dnode */ 744 for (i = 0; i < dnp->dn_nblkptr; i++) 745 bp->blk_fill += dnp->dn_blkptr[i].blk_fill; 746 } 747 748 /* ARGSUSED */ 749 static void 750 killer(zio_t *zio, arc_buf_t *abuf, void *arg) 751 { 752 objset_impl_t *os = arg; 753 754 ASSERT3U(zio->io_error, ==, 0); 755 756 BP_SET_TYPE(zio->io_bp, DMU_OT_OBJSET); 757 BP_SET_LEVEL(zio->io_bp, 0); 758 759 if (!DVA_EQUAL(BP_IDENTITY(zio->io_bp), 760 BP_IDENTITY(&zio->io_bp_orig))) { 761 if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg) 762 dsl_dataset_block_kill(os->os_dsl_dataset, 763 &zio->io_bp_orig, NULL, os->os_synctx); 764 dsl_dataset_block_born(os->os_dsl_dataset, zio->io_bp, 765 os->os_synctx); 766 } 767 arc_release(os->os_phys_buf, &os->os_phys_buf); 768 } 769 770 /* called from dsl */ 771 void 772 dmu_objset_sync(objset_impl_t *os, zio_t *pio, dmu_tx_t *tx) 773 { 774 int txgoff; 775 zbookmark_t zb; 776 zio_t *zio; 777 list_t *list; 778 dbuf_dirty_record_t *dr; 779 780 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 781 782 ASSERT(dmu_tx_is_syncing(tx)); 783 /* XXX the write_done callback should really give us the tx... */ 784 os->os_synctx = tx; 785 786 if (os->os_dsl_dataset == NULL) { 787 /* 788 * This is the MOS. If we have upgraded, 789 * spa_max_replication() could change, so reset 790 * os_copies here. 791 */ 792 os->os_copies = spa_max_replication(os->os_spa); 793 } 794 795 /* 796 * Create the root block IO 797 */ 798 zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 799 zb.zb_object = 0; 800 zb.zb_level = -1; 801 zb.zb_blkid = 0; 802 if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) { 803 dsl_dataset_block_kill(os->os_dsl_dataset, 804 os->os_rootbp, pio, tx); 805 } 806 zio = arc_write(pio, os->os_spa, os->os_md_checksum, 807 os->os_md_compress, 808 dmu_get_replication_level(os, &zb, DMU_OT_OBJSET), 809 tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, killer, os, 810 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_METADATA, 811 &zb); 812 813 /* 814 * Sync meta-dnode - the parent IO for the sync is the root block 815 */ 816 os->os_meta_dnode->dn_zio = zio; 817 dnode_sync(os->os_meta_dnode, tx); 818 819 txgoff = tx->tx_txg & TXG_MASK; 820 821 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], tx); 822 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], tx); 823 824 list = &os->os_meta_dnode->dn_dirty_records[txgoff]; 825 while (dr = list_head(list)) { 826 ASSERT(dr->dr_dbuf->db_level == 0); 827 list_remove(list, dr); 828 if (dr->dr_zio) 829 zio_nowait(dr->dr_zio); 830 } 831 /* 832 * Free intent log blocks up to this tx. 833 */ 834 zil_sync(os->os_zil, tx); 835 zio_nowait(zio); 836 } 837 838 void 839 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 840 uint64_t *usedobjsp, uint64_t *availobjsp) 841 { 842 dsl_dataset_space(os->os->os_dsl_dataset, refdbytesp, availbytesp, 843 usedobjsp, availobjsp); 844 } 845 846 uint64_t 847 dmu_objset_fsid_guid(objset_t *os) 848 { 849 return (dsl_dataset_fsid_guid(os->os->os_dsl_dataset)); 850 } 851 852 void 853 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 854 { 855 stat->dds_type = os->os->os_phys->os_type; 856 if (os->os->os_dsl_dataset) 857 dsl_dataset_fast_stat(os->os->os_dsl_dataset, stat); 858 } 859 860 void 861 dmu_objset_stats(objset_t *os, nvlist_t *nv) 862 { 863 ASSERT(os->os->os_dsl_dataset || 864 os->os->os_phys->os_type == DMU_OST_META); 865 866 if (os->os->os_dsl_dataset != NULL) 867 dsl_dataset_stats(os->os->os_dsl_dataset, nv); 868 869 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 870 os->os->os_phys->os_type); 871 } 872 873 int 874 dmu_objset_is_snapshot(objset_t *os) 875 { 876 if (os->os->os_dsl_dataset != NULL) 877 return (dsl_dataset_is_snapshot(os->os->os_dsl_dataset)); 878 else 879 return (B_FALSE); 880 } 881 882 int 883 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 884 uint64_t *idp, uint64_t *offp) 885 { 886 dsl_dataset_t *ds = os->os->os_dsl_dataset; 887 zap_cursor_t cursor; 888 zap_attribute_t attr; 889 890 if (ds->ds_phys->ds_snapnames_zapobj == 0) 891 return (ENOENT); 892 893 zap_cursor_init_serialized(&cursor, 894 ds->ds_dir->dd_pool->dp_meta_objset, 895 ds->ds_phys->ds_snapnames_zapobj, *offp); 896 897 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 898 zap_cursor_fini(&cursor); 899 return (ENOENT); 900 } 901 902 if (strlen(attr.za_name) + 1 > namelen) { 903 zap_cursor_fini(&cursor); 904 return (ENAMETOOLONG); 905 } 906 907 (void) strcpy(name, attr.za_name); 908 if (idp) 909 *idp = attr.za_first_integer; 910 zap_cursor_advance(&cursor); 911 *offp = zap_cursor_serialize(&cursor); 912 zap_cursor_fini(&cursor); 913 914 return (0); 915 } 916 917 int 918 dmu_dir_list_next(objset_t *os, int namelen, char *name, 919 uint64_t *idp, uint64_t *offp) 920 { 921 dsl_dir_t *dd = os->os->os_dsl_dataset->ds_dir; 922 zap_cursor_t cursor; 923 zap_attribute_t attr; 924 925 /* there is no next dir on a snapshot! */ 926 if (os->os->os_dsl_dataset->ds_object != 927 dd->dd_phys->dd_head_dataset_obj) 928 return (ENOENT); 929 930 zap_cursor_init_serialized(&cursor, 931 dd->dd_pool->dp_meta_objset, 932 dd->dd_phys->dd_child_dir_zapobj, *offp); 933 934 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 935 zap_cursor_fini(&cursor); 936 return (ENOENT); 937 } 938 939 if (strlen(attr.za_name) + 1 > namelen) { 940 zap_cursor_fini(&cursor); 941 return (ENAMETOOLONG); 942 } 943 944 (void) strcpy(name, attr.za_name); 945 if (idp) 946 *idp = attr.za_first_integer; 947 zap_cursor_advance(&cursor); 948 *offp = zap_cursor_serialize(&cursor); 949 zap_cursor_fini(&cursor); 950 951 return (0); 952 } 953 954 /* 955 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 956 */ 957 int 958 dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags) 959 { 960 dsl_dir_t *dd; 961 objset_t *os; 962 uint64_t snapobj; 963 zap_cursor_t zc; 964 zap_attribute_t *attr; 965 char *child; 966 int do_self, err; 967 968 err = dsl_dir_open(name, FTAG, &dd, NULL); 969 if (err) 970 return (err); 971 972 /* NB: the $MOS dir doesn't have a head dataset */ 973 do_self = (dd->dd_phys->dd_head_dataset_obj != 0); 974 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 975 976 /* 977 * Iterate over all children. 978 */ 979 if (flags & DS_FIND_CHILDREN) { 980 for (zap_cursor_init(&zc, dd->dd_pool->dp_meta_objset, 981 dd->dd_phys->dd_child_dir_zapobj); 982 zap_cursor_retrieve(&zc, attr) == 0; 983 (void) zap_cursor_advance(&zc)) { 984 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 985 ASSERT(attr->za_num_integers == 1); 986 987 /* 988 * No separating '/' because parent's name ends in /. 989 */ 990 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 991 /* XXX could probably just use name here */ 992 dsl_dir_name(dd, child); 993 (void) strcat(child, "/"); 994 (void) strcat(child, attr->za_name); 995 err = dmu_objset_find(child, func, arg, flags); 996 kmem_free(child, MAXPATHLEN); 997 if (err) 998 break; 999 } 1000 zap_cursor_fini(&zc); 1001 1002 if (err) { 1003 dsl_dir_close(dd, FTAG); 1004 kmem_free(attr, sizeof (zap_attribute_t)); 1005 return (err); 1006 } 1007 } 1008 1009 /* 1010 * Iterate over all snapshots. 1011 */ 1012 if ((flags & DS_FIND_SNAPSHOTS) && 1013 dmu_objset_open(name, DMU_OST_ANY, 1014 DS_MODE_STANDARD | DS_MODE_READONLY, &os) == 0) { 1015 1016 snapobj = os->os->os_dsl_dataset->ds_phys->ds_snapnames_zapobj; 1017 dmu_objset_close(os); 1018 1019 for (zap_cursor_init(&zc, dd->dd_pool->dp_meta_objset, snapobj); 1020 zap_cursor_retrieve(&zc, attr) == 0; 1021 (void) zap_cursor_advance(&zc)) { 1022 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 1023 ASSERT(attr->za_num_integers == 1); 1024 1025 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1026 /* XXX could probably just use name here */ 1027 dsl_dir_name(dd, child); 1028 (void) strcat(child, "@"); 1029 (void) strcat(child, attr->za_name); 1030 err = func(child, arg); 1031 kmem_free(child, MAXPATHLEN); 1032 if (err) 1033 break; 1034 } 1035 zap_cursor_fini(&zc); 1036 } 1037 1038 dsl_dir_close(dd, FTAG); 1039 kmem_free(attr, sizeof (zap_attribute_t)); 1040 1041 if (err) 1042 return (err); 1043 1044 /* 1045 * Apply to self if appropriate. 1046 */ 1047 if (do_self) 1048 err = func(name, arg); 1049 return (err); 1050 } 1051