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 spa_t * 48 dmu_objset_spa(objset_t *os) 49 { 50 return (os->os->os_spa); 51 } 52 53 zilog_t * 54 dmu_objset_zil(objset_t *os) 55 { 56 return (os->os->os_zil); 57 } 58 59 dsl_pool_t * 60 dmu_objset_pool(objset_t *os) 61 { 62 dsl_dataset_t *ds; 63 64 if ((ds = os->os->os_dsl_dataset) != NULL && ds->ds_dir) 65 return (ds->ds_dir->dd_pool); 66 else 67 return (spa_get_dsl(os->os->os_spa)); 68 } 69 70 dsl_dataset_t * 71 dmu_objset_ds(objset_t *os) 72 { 73 return (os->os->os_dsl_dataset); 74 } 75 76 dmu_objset_type_t 77 dmu_objset_type(objset_t *os) 78 { 79 return (os->os->os_phys->os_type); 80 } 81 82 void 83 dmu_objset_name(objset_t *os, char *buf) 84 { 85 dsl_dataset_name(os->os->os_dsl_dataset, buf); 86 } 87 88 uint64_t 89 dmu_objset_id(objset_t *os) 90 { 91 dsl_dataset_t *ds = os->os->os_dsl_dataset; 92 93 return (ds ? ds->ds_object : 0); 94 } 95 96 static void 97 checksum_changed_cb(void *arg, uint64_t newval) 98 { 99 objset_impl_t *osi = arg; 100 101 /* 102 * Inheritance should have been done by now. 103 */ 104 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 105 106 osi->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 107 } 108 109 static void 110 compression_changed_cb(void *arg, uint64_t newval) 111 { 112 objset_impl_t *osi = arg; 113 114 /* 115 * Inheritance and range checking should have been done by now. 116 */ 117 ASSERT(newval != ZIO_COMPRESS_INHERIT); 118 119 osi->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); 120 } 121 122 static void 123 copies_changed_cb(void *arg, uint64_t newval) 124 { 125 objset_impl_t *osi = arg; 126 127 /* 128 * Inheritance and range checking should have been done by now. 129 */ 130 ASSERT(newval > 0); 131 ASSERT(newval <= spa_max_replication(osi->os_spa)); 132 133 osi->os_copies = newval; 134 } 135 136 void 137 dmu_objset_byteswap(void *buf, size_t size) 138 { 139 objset_phys_t *osp = buf; 140 141 ASSERT(size == sizeof (objset_phys_t)); 142 dnode_byteswap(&osp->os_meta_dnode); 143 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 144 osp->os_type = BSWAP_64(osp->os_type); 145 } 146 147 int 148 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 149 objset_impl_t **osip) 150 { 151 objset_impl_t *osi; 152 int i, err, checksum; 153 154 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 155 156 osi = kmem_zalloc(sizeof (objset_impl_t), KM_SLEEP); 157 osi->os.os = osi; 158 osi->os_dsl_dataset = ds; 159 osi->os_spa = spa; 160 osi->os_rootbp = bp; 161 if (!BP_IS_HOLE(osi->os_rootbp)) { 162 uint32_t aflags = ARC_WAIT; 163 zbookmark_t zb; 164 zb.zb_objset = ds ? ds->ds_object : 0; 165 zb.zb_object = 0; 166 zb.zb_level = -1; 167 zb.zb_blkid = 0; 168 169 dprintf_bp(osi->os_rootbp, "reading %s", ""); 170 err = arc_read(NULL, spa, osi->os_rootbp, 171 dmu_ot[DMU_OT_OBJSET].ot_byteswap, 172 arc_getbuf_func, &osi->os_phys_buf, 173 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 174 if (err) { 175 kmem_free(osi, sizeof (objset_impl_t)); 176 return (err); 177 } 178 osi->os_phys = osi->os_phys_buf->b_data; 179 if (ds == NULL || dsl_dataset_is_snapshot(ds) == 0) 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 mutex_init(&osi->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 247 248 osi->os_meta_dnode = dnode_special_open(osi, 249 &osi->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT); 250 251 /* 252 * We should be the only thread trying to do this because we 253 * have ds_opening_lock 254 */ 255 if (ds) { 256 VERIFY(NULL == dsl_dataset_set_user_ptr(ds, osi, 257 dmu_objset_evict)); 258 } 259 260 *osip = osi; 261 return (0); 262 } 263 264 /* called from zpl */ 265 int 266 dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 267 objset_t **osp) 268 { 269 objset_t *os; 270 dsl_dataset_t *ds; 271 objset_impl_t *osi; 272 int err; 273 274 os = kmem_alloc(sizeof (objset_t), KM_SLEEP); 275 err = dsl_dataset_open(name, mode, os, &ds); 276 if (err) { 277 kmem_free(os, sizeof (objset_t)); 278 return (err); 279 } 280 281 mutex_enter(&ds->ds_opening_lock); 282 osi = dsl_dataset_get_user_ptr(ds); 283 if (osi == NULL) { 284 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 285 ds, &ds->ds_phys->ds_bp, &osi); 286 if (err) { 287 dsl_dataset_close(ds, mode, os); 288 kmem_free(os, sizeof (objset_t)); 289 return (err); 290 } 291 } 292 mutex_exit(&ds->ds_opening_lock); 293 294 os->os = osi; 295 os->os_mode = mode; 296 297 if (type != DMU_OST_ANY && type != os->os->os_phys->os_type) { 298 dmu_objset_close(os); 299 return (EINVAL); 300 } 301 *osp = os; 302 return (0); 303 } 304 305 void 306 dmu_objset_close(objset_t *os) 307 { 308 dsl_dataset_close(os->os->os_dsl_dataset, os->os_mode, os); 309 kmem_free(os, sizeof (objset_t)); 310 } 311 312 int 313 dmu_objset_evict_dbufs(objset_t *os) 314 { 315 objset_impl_t *osi = os->os; 316 dnode_t *dn; 317 318 mutex_enter(&osi->os_lock); 319 320 /* process the mdn last, since the other dnodes have holds on it */ 321 list_remove(&osi->os_dnodes, osi->os_meta_dnode); 322 list_insert_tail(&osi->os_dnodes, osi->os_meta_dnode); 323 324 /* 325 * Find the first dnode with holds. We have to do this dance 326 * because dnode_add_ref() only works if you already have a 327 * hold. If there are no holds then it has no dbufs so OK to 328 * skip. 329 */ 330 for (dn = list_head(&osi->os_dnodes); 331 dn && !dnode_add_ref(dn, FTAG); 332 dn = list_next(&osi->os_dnodes, dn)) 333 continue; 334 335 while (dn) { 336 dnode_t *next_dn = dn; 337 338 do { 339 next_dn = list_next(&osi->os_dnodes, next_dn); 340 } while (next_dn && !dnode_add_ref(next_dn, FTAG)); 341 342 mutex_exit(&osi->os_lock); 343 dnode_evict_dbufs(dn); 344 dnode_rele(dn, FTAG); 345 mutex_enter(&osi->os_lock); 346 dn = next_dn; 347 } 348 mutex_exit(&osi->os_lock); 349 return (list_head(&osi->os_dnodes) != osi->os_meta_dnode); 350 } 351 352 void 353 dmu_objset_evict(dsl_dataset_t *ds, void *arg) 354 { 355 objset_impl_t *osi = arg; 356 objset_t os; 357 int i; 358 359 for (i = 0; i < TXG_SIZE; i++) { 360 ASSERT(list_head(&osi->os_dirty_dnodes[i]) == NULL); 361 ASSERT(list_head(&osi->os_free_dnodes[i]) == NULL); 362 } 363 364 if (ds && ds->ds_phys->ds_num_children == 0) { 365 VERIFY(0 == dsl_prop_unregister(ds, "checksum", 366 checksum_changed_cb, osi)); 367 VERIFY(0 == dsl_prop_unregister(ds, "compression", 368 compression_changed_cb, osi)); 369 VERIFY(0 == dsl_prop_unregister(ds, "copies", 370 copies_changed_cb, osi)); 371 } 372 373 /* 374 * We should need only a single pass over the dnode list, since 375 * nothing can be added to the list at this point. 376 */ 377 os.os = osi; 378 (void) dmu_objset_evict_dbufs(&os); 379 380 ASSERT3P(list_head(&osi->os_dnodes), ==, osi->os_meta_dnode); 381 ASSERT3P(list_tail(&osi->os_dnodes), ==, osi->os_meta_dnode); 382 ASSERT3P(list_head(&osi->os_meta_dnode->dn_dbufs), ==, NULL); 383 384 dnode_special_close(osi->os_meta_dnode); 385 zil_free(osi->os_zil); 386 387 VERIFY(arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf) == 1); 388 mutex_destroy(&osi->os_lock); 389 mutex_destroy(&osi->os_obj_lock); 390 mutex_destroy(&osi->os_user_ptr_lock); 391 kmem_free(osi, sizeof (objset_impl_t)); 392 } 393 394 /* called from dsl for meta-objset */ 395 objset_impl_t * 396 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 397 dmu_objset_type_t type, dmu_tx_t *tx) 398 { 399 objset_impl_t *osi; 400 dnode_t *mdn; 401 402 ASSERT(dmu_tx_is_syncing(tx)); 403 if (ds) 404 mutex_enter(&ds->ds_opening_lock); 405 VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &osi)); 406 if (ds) 407 mutex_exit(&ds->ds_opening_lock); 408 mdn = osi->os_meta_dnode; 409 410 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 411 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 412 413 /* 414 * We don't want to have to increase the meta-dnode's nlevels 415 * later, because then we could do it in quescing context while 416 * we are also accessing it in open context. 417 * 418 * This precaution is not necessary for the MOS (ds == NULL), 419 * because the MOS is only updated in syncing context. 420 * This is most fortunate: the MOS is the only objset that 421 * needs to be synced multiple times as spa_sync() iterates 422 * to convergence, so minimizing its dn_nlevels matters. 423 */ 424 if (ds != NULL) { 425 int levels = 1; 426 427 /* 428 * Determine the number of levels necessary for the meta-dnode 429 * to contain DN_MAX_OBJECT dnodes. 430 */ 431 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 432 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 433 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 434 levels++; 435 436 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 437 mdn->dn_nlevels = levels; 438 } 439 440 ASSERT(type != DMU_OST_NONE); 441 ASSERT(type != DMU_OST_ANY); 442 ASSERT(type < DMU_OST_NUMTYPES); 443 osi->os_phys->os_type = type; 444 445 dsl_dataset_dirty(ds, tx); 446 447 return (osi); 448 } 449 450 struct oscarg { 451 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); 452 void *userarg; 453 dsl_dataset_t *clone_parent; 454 const char *lastname; 455 dmu_objset_type_t type; 456 }; 457 458 /*ARGSUSED*/ 459 static int 460 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) 461 { 462 dsl_dir_t *dd = arg1; 463 struct oscarg *oa = arg2; 464 objset_t *mos = dd->dd_pool->dp_meta_objset; 465 int err; 466 uint64_t ddobj; 467 468 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 469 oa->lastname, sizeof (uint64_t), 1, &ddobj); 470 if (err != ENOENT) 471 return (err ? err : EEXIST); 472 473 if (oa->clone_parent != NULL) { 474 /* 475 * You can't clone across pools. 476 */ 477 if (oa->clone_parent->ds_dir->dd_pool != dd->dd_pool) 478 return (EXDEV); 479 480 /* 481 * You can only clone snapshots, not the head datasets. 482 */ 483 if (oa->clone_parent->ds_phys->ds_num_children == 0) 484 return (EINVAL); 485 } 486 487 return (0); 488 } 489 490 static void 491 dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 492 { 493 dsl_dir_t *dd = arg1; 494 struct oscarg *oa = arg2; 495 dsl_dataset_t *ds; 496 blkptr_t *bp; 497 uint64_t dsobj; 498 499 ASSERT(dmu_tx_is_syncing(tx)); 500 501 dsobj = dsl_dataset_create_sync(dd, oa->lastname, 502 oa->clone_parent, tx); 503 504 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dsobj, NULL, 505 DS_MODE_STANDARD | DS_MODE_READONLY, FTAG, &ds)); 506 bp = dsl_dataset_get_blkptr(ds); 507 if (BP_IS_HOLE(bp)) { 508 objset_impl_t *osi; 509 510 /* This is an empty dmu_objset; not a clone. */ 511 osi = dmu_objset_create_impl(dsl_dataset_get_spa(ds), 512 ds, bp, oa->type, tx); 513 514 if (oa->userfunc) 515 oa->userfunc(&osi->os, oa->userarg, cr, tx); 516 } 517 518 /* 519 * Create create time permission if any? 520 */ 521 dsl_deleg_set_create_perms(ds->ds_dir, tx, cr); 522 523 spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa, 524 tx, cr, "dataset = %llu", dsobj); 525 526 dsl_dataset_close(ds, DS_MODE_STANDARD | DS_MODE_READONLY, FTAG); 527 } 528 529 int 530 dmu_objset_create(const char *name, dmu_objset_type_t type, 531 objset_t *clone_parent, 532 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 533 { 534 dsl_dir_t *pdd; 535 const char *tail; 536 int err = 0; 537 struct oscarg oa = { 0 }; 538 539 ASSERT(strchr(name, '@') == NULL); 540 err = dsl_dir_open(name, FTAG, &pdd, &tail); 541 if (err) 542 return (err); 543 if (tail == NULL) { 544 dsl_dir_close(pdd, FTAG); 545 return (EEXIST); 546 } 547 548 dprintf("name=%s\n", name); 549 550 oa.userfunc = func; 551 oa.userarg = arg; 552 oa.lastname = tail; 553 oa.type = type; 554 555 if (clone_parent != NULL) { 556 /* 557 * You can't clone to a different type. 558 */ 559 if (clone_parent->os->os_phys->os_type != type) { 560 dsl_dir_close(pdd, FTAG); 561 return (EINVAL); 562 } 563 oa.clone_parent = clone_parent->os->os_dsl_dataset; 564 } 565 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 566 dmu_objset_create_sync, pdd, &oa, 5); 567 dsl_dir_close(pdd, FTAG); 568 return (err); 569 } 570 571 int 572 dmu_objset_destroy(const char *name) 573 { 574 objset_t *os; 575 int error; 576 577 /* 578 * If it looks like we'll be able to destroy it, and there's 579 * an unplayed replay log sitting around, destroy the log. 580 * It would be nicer to do this in dsl_dataset_destroy_sync(), 581 * but the replay log objset is modified in open context. 582 */ 583 error = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_EXCLUSIVE, &os); 584 if (error == 0) { 585 zil_destroy(dmu_objset_zil(os), B_FALSE); 586 dmu_objset_close(os); 587 } 588 589 return (dsl_dataset_destroy(name)); 590 } 591 592 int 593 dmu_objset_rollback(const char *name) 594 { 595 int err; 596 objset_t *os; 597 598 err = dmu_objset_open(name, DMU_OST_ANY, 599 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, &os); 600 if (err) 601 return (err); 602 603 /* XXX uncache everything? */ 604 err = dsl_dataset_rollback(os->os->os_dsl_dataset); 605 606 dmu_objset_close(os); 607 return (err); 608 } 609 610 struct snaparg { 611 dsl_sync_task_group_t *dstg; 612 char *snapname; 613 char failed[MAXPATHLEN]; 614 boolean_t checkperms; 615 }; 616 617 static int 618 dmu_objset_snapshot_one(char *name, void *arg) 619 { 620 struct snaparg *sn = arg; 621 objset_t *os; 622 dmu_objset_stats_t stat; 623 int err; 624 625 (void) strcpy(sn->failed, name); 626 627 /* 628 * Check permissions only when requested. This only applies when 629 * doing a recursive snapshot. The permission checks for the starting 630 * dataset have already been performed in zfs_secpolicy_snapshot() 631 */ 632 if (sn->checkperms == B_TRUE && 633 (err = zfs_secpolicy_snapshot_perms(name, CRED()))) 634 return (err); 635 636 err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_STANDARD, &os); 637 if (err != 0) 638 return (err); 639 640 /* 641 * If the objset is in an inconsistent state, return busy. 642 */ 643 dmu_objset_fast_stat(os, &stat); 644 if (stat.dds_inconsistent) { 645 dmu_objset_close(os); 646 return (EBUSY); 647 } 648 649 /* 650 * NB: we need to wait for all in-flight changes to get to disk, 651 * so that we snapshot those changes. zil_suspend does this as 652 * a side effect. 653 */ 654 err = zil_suspend(dmu_objset_zil(os)); 655 if (err == 0) { 656 dsl_sync_task_create(sn->dstg, dsl_dataset_snapshot_check, 657 dsl_dataset_snapshot_sync, os, sn->snapname, 3); 658 } else { 659 dmu_objset_close(os); 660 } 661 662 return (err); 663 } 664 665 int 666 dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive) 667 { 668 dsl_sync_task_t *dst; 669 struct snaparg sn = { 0 }; 670 spa_t *spa; 671 int err; 672 673 (void) strcpy(sn.failed, fsname); 674 675 err = spa_open(fsname, &spa, FTAG); 676 if (err) 677 return (err); 678 679 sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 680 sn.snapname = snapname; 681 682 if (recursive) { 683 sn.checkperms = B_TRUE; 684 err = dmu_objset_find(fsname, 685 dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); 686 } else { 687 sn.checkperms = B_FALSE; 688 err = dmu_objset_snapshot_one(fsname, &sn); 689 } 690 691 if (err) 692 goto out; 693 694 err = dsl_sync_task_group_wait(sn.dstg); 695 696 for (dst = list_head(&sn.dstg->dstg_tasks); dst; 697 dst = list_next(&sn.dstg->dstg_tasks, dst)) { 698 objset_t *os = dst->dst_arg1; 699 if (dst->dst_err) 700 dmu_objset_name(os, sn.failed); 701 zil_resume(dmu_objset_zil(os)); 702 dmu_objset_close(os); 703 } 704 out: 705 if (err) 706 (void) strcpy(fsname, sn.failed); 707 dsl_sync_task_group_destroy(sn.dstg); 708 spa_close(spa, FTAG); 709 return (err); 710 } 711 712 static void 713 dmu_objset_sync_dnodes(list_t *list, dmu_tx_t *tx) 714 { 715 dnode_t *dn; 716 717 while (dn = list_head(list)) { 718 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 719 ASSERT(dn->dn_dbuf->db_data_pending); 720 /* 721 * Initialize dn_zio outside dnode_sync() 722 * to accomodate meta-dnode 723 */ 724 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 725 ASSERT(dn->dn_zio); 726 727 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 728 list_remove(list, dn); 729 dnode_sync(dn, tx); 730 } 731 } 732 733 /* ARGSUSED */ 734 static void 735 ready(zio_t *zio, arc_buf_t *abuf, void *arg) 736 { 737 objset_impl_t *os = arg; 738 blkptr_t *bp = os->os_rootbp; 739 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 740 int i; 741 742 ASSERT(bp == zio->io_bp); 743 744 /* 745 * Update rootbp fill count. 746 */ 747 bp->blk_fill = 1; /* count the meta-dnode */ 748 for (i = 0; i < dnp->dn_nblkptr; i++) 749 bp->blk_fill += dnp->dn_blkptr[i].blk_fill; 750 751 BP_SET_TYPE(bp, DMU_OT_OBJSET); 752 BP_SET_LEVEL(bp, 0); 753 754 /* We must do this after we've set the bp's type and level */ 755 if (!DVA_EQUAL(BP_IDENTITY(bp), 756 BP_IDENTITY(&zio->io_bp_orig))) { 757 if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg) 758 dsl_dataset_block_kill(os->os_dsl_dataset, 759 &zio->io_bp_orig, NULL, os->os_synctx); 760 dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx); 761 } 762 } 763 764 /* ARGSUSED */ 765 static void 766 killer(zio_t *zio, arc_buf_t *abuf, void *arg) 767 { 768 objset_impl_t *os = arg; 769 770 ASSERT3U(zio->io_error, ==, 0); 771 arc_release(os->os_phys_buf, &os->os_phys_buf); 772 } 773 774 /* called from dsl */ 775 void 776 dmu_objset_sync(objset_impl_t *os, zio_t *pio, dmu_tx_t *tx) 777 { 778 int txgoff; 779 zbookmark_t zb; 780 zio_t *zio; 781 list_t *list; 782 dbuf_dirty_record_t *dr; 783 784 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 785 786 ASSERT(dmu_tx_is_syncing(tx)); 787 /* XXX the write_done callback should really give us the tx... */ 788 os->os_synctx = tx; 789 790 if (os->os_dsl_dataset == NULL) { 791 /* 792 * This is the MOS. If we have upgraded, 793 * spa_max_replication() could change, so reset 794 * os_copies here. 795 */ 796 os->os_copies = spa_max_replication(os->os_spa); 797 } 798 799 /* 800 * Create the root block IO 801 */ 802 zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 803 zb.zb_object = 0; 804 zb.zb_level = -1; 805 zb.zb_blkid = 0; 806 if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) { 807 dsl_dataset_block_kill(os->os_dsl_dataset, 808 os->os_rootbp, pio, tx); 809 } 810 zio = arc_write(pio, os->os_spa, os->os_md_checksum, 811 os->os_md_compress, 812 dmu_get_replication_level(os, &zb, DMU_OT_OBJSET), 813 tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, killer, os, 814 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED | ZIO_FLAG_METADATA, 815 &zb); 816 817 /* 818 * Sync meta-dnode - the parent IO for the sync is the root block 819 */ 820 os->os_meta_dnode->dn_zio = zio; 821 dnode_sync(os->os_meta_dnode, tx); 822 823 txgoff = tx->tx_txg & TXG_MASK; 824 825 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], tx); 826 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], tx); 827 828 list = &os->os_meta_dnode->dn_dirty_records[txgoff]; 829 while (dr = list_head(list)) { 830 ASSERT(dr->dr_dbuf->db_level == 0); 831 list_remove(list, dr); 832 if (dr->dr_zio) 833 zio_nowait(dr->dr_zio); 834 } 835 /* 836 * Free intent log blocks up to this tx. 837 */ 838 zil_sync(os->os_zil, tx); 839 zio_nowait(zio); 840 } 841 842 void 843 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 844 uint64_t *usedobjsp, uint64_t *availobjsp) 845 { 846 dsl_dataset_space(os->os->os_dsl_dataset, refdbytesp, availbytesp, 847 usedobjsp, availobjsp); 848 } 849 850 uint64_t 851 dmu_objset_fsid_guid(objset_t *os) 852 { 853 return (dsl_dataset_fsid_guid(os->os->os_dsl_dataset)); 854 } 855 856 void 857 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 858 { 859 stat->dds_type = os->os->os_phys->os_type; 860 if (os->os->os_dsl_dataset) 861 dsl_dataset_fast_stat(os->os->os_dsl_dataset, stat); 862 } 863 864 void 865 dmu_objset_stats(objset_t *os, nvlist_t *nv) 866 { 867 ASSERT(os->os->os_dsl_dataset || 868 os->os->os_phys->os_type == DMU_OST_META); 869 870 if (os->os->os_dsl_dataset != NULL) 871 dsl_dataset_stats(os->os->os_dsl_dataset, nv); 872 873 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 874 os->os->os_phys->os_type); 875 } 876 877 int 878 dmu_objset_is_snapshot(objset_t *os) 879 { 880 if (os->os->os_dsl_dataset != NULL) 881 return (dsl_dataset_is_snapshot(os->os->os_dsl_dataset)); 882 else 883 return (B_FALSE); 884 } 885 886 int 887 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 888 uint64_t *idp, uint64_t *offp) 889 { 890 dsl_dataset_t *ds = os->os->os_dsl_dataset; 891 zap_cursor_t cursor; 892 zap_attribute_t attr; 893 894 if (ds->ds_phys->ds_snapnames_zapobj == 0) 895 return (ENOENT); 896 897 zap_cursor_init_serialized(&cursor, 898 ds->ds_dir->dd_pool->dp_meta_objset, 899 ds->ds_phys->ds_snapnames_zapobj, *offp); 900 901 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 902 zap_cursor_fini(&cursor); 903 return (ENOENT); 904 } 905 906 if (strlen(attr.za_name) + 1 > namelen) { 907 zap_cursor_fini(&cursor); 908 return (ENAMETOOLONG); 909 } 910 911 (void) strcpy(name, attr.za_name); 912 if (idp) 913 *idp = attr.za_first_integer; 914 zap_cursor_advance(&cursor); 915 *offp = zap_cursor_serialize(&cursor); 916 zap_cursor_fini(&cursor); 917 918 return (0); 919 } 920 921 int 922 dmu_dir_list_next(objset_t *os, int namelen, char *name, 923 uint64_t *idp, uint64_t *offp) 924 { 925 dsl_dir_t *dd = os->os->os_dsl_dataset->ds_dir; 926 zap_cursor_t cursor; 927 zap_attribute_t attr; 928 929 /* there is no next dir on a snapshot! */ 930 if (os->os->os_dsl_dataset->ds_object != 931 dd->dd_phys->dd_head_dataset_obj) 932 return (ENOENT); 933 934 zap_cursor_init_serialized(&cursor, 935 dd->dd_pool->dp_meta_objset, 936 dd->dd_phys->dd_child_dir_zapobj, *offp); 937 938 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 939 zap_cursor_fini(&cursor); 940 return (ENOENT); 941 } 942 943 if (strlen(attr.za_name) + 1 > namelen) { 944 zap_cursor_fini(&cursor); 945 return (ENAMETOOLONG); 946 } 947 948 (void) strcpy(name, attr.za_name); 949 if (idp) 950 *idp = attr.za_first_integer; 951 zap_cursor_advance(&cursor); 952 *offp = zap_cursor_serialize(&cursor); 953 zap_cursor_fini(&cursor); 954 955 return (0); 956 } 957 958 /* 959 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 960 */ 961 int 962 dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags) 963 { 964 dsl_dir_t *dd; 965 objset_t *os; 966 uint64_t snapobj; 967 zap_cursor_t zc; 968 zap_attribute_t *attr; 969 char *child; 970 int do_self, err; 971 972 err = dsl_dir_open(name, FTAG, &dd, NULL); 973 if (err) 974 return (err); 975 976 /* NB: the $MOS dir doesn't have a head dataset */ 977 do_self = (dd->dd_phys->dd_head_dataset_obj != 0); 978 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 979 980 /* 981 * Iterate over all children. 982 */ 983 if (flags & DS_FIND_CHILDREN) { 984 for (zap_cursor_init(&zc, dd->dd_pool->dp_meta_objset, 985 dd->dd_phys->dd_child_dir_zapobj); 986 zap_cursor_retrieve(&zc, attr) == 0; 987 (void) zap_cursor_advance(&zc)) { 988 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 989 ASSERT(attr->za_num_integers == 1); 990 991 /* 992 * No separating '/' because parent's name ends in /. 993 */ 994 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 995 /* XXX could probably just use name here */ 996 dsl_dir_name(dd, child); 997 (void) strcat(child, "/"); 998 (void) strcat(child, attr->za_name); 999 err = dmu_objset_find(child, func, arg, flags); 1000 kmem_free(child, MAXPATHLEN); 1001 if (err) 1002 break; 1003 } 1004 zap_cursor_fini(&zc); 1005 1006 if (err) { 1007 dsl_dir_close(dd, FTAG); 1008 kmem_free(attr, sizeof (zap_attribute_t)); 1009 return (err); 1010 } 1011 } 1012 1013 /* 1014 * Iterate over all snapshots. 1015 */ 1016 if ((flags & DS_FIND_SNAPSHOTS) && 1017 dmu_objset_open(name, DMU_OST_ANY, 1018 DS_MODE_STANDARD | DS_MODE_READONLY, &os) == 0) { 1019 1020 snapobj = os->os->os_dsl_dataset->ds_phys->ds_snapnames_zapobj; 1021 dmu_objset_close(os); 1022 1023 for (zap_cursor_init(&zc, dd->dd_pool->dp_meta_objset, snapobj); 1024 zap_cursor_retrieve(&zc, attr) == 0; 1025 (void) zap_cursor_advance(&zc)) { 1026 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 1027 ASSERT(attr->za_num_integers == 1); 1028 1029 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1030 /* XXX could probably just use name here */ 1031 dsl_dir_name(dd, child); 1032 (void) strcat(child, "@"); 1033 (void) strcat(child, attr->za_name); 1034 err = func(child, arg); 1035 kmem_free(child, MAXPATHLEN); 1036 if (err) 1037 break; 1038 } 1039 zap_cursor_fini(&zc); 1040 } 1041 1042 dsl_dir_close(dd, FTAG); 1043 kmem_free(attr, sizeof (zap_attribute_t)); 1044 1045 if (err) 1046 return (err); 1047 1048 /* 1049 * Apply to self if appropriate. 1050 */ 1051 if (do_self) 1052 err = func(name, arg); 1053 return (err); 1054 } 1055 1056 void 1057 dmu_objset_set_user(objset_t *os, void *user_ptr) 1058 { 1059 ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock)); 1060 os->os->os_user_ptr = user_ptr; 1061 } 1062 1063 void * 1064 dmu_objset_get_user(objset_t *os) 1065 { 1066 ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock)); 1067 return (os->os->os_user_ptr); 1068 } 1069