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 2008 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->os_spa); 49 } 50 51 zilog_t * 52 dmu_objset_zil(objset_t *os) 53 { 54 return (os->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->os_dsl_dataset) != NULL && ds->ds_dir) 63 return (ds->ds_dir->dd_pool); 64 else 65 return (spa_get_dsl(os->os->os_spa)); 66 } 67 68 dsl_dataset_t * 69 dmu_objset_ds(objset_t *os) 70 { 71 return (os->os->os_dsl_dataset); 72 } 73 74 dmu_objset_type_t 75 dmu_objset_type(objset_t *os) 76 { 77 return (os->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->os_dsl_dataset, buf); 84 } 85 86 uint64_t 87 dmu_objset_id(objset_t *os) 88 { 89 dsl_dataset_t *ds = os->os->os_dsl_dataset; 90 91 return (ds ? ds->ds_object : 0); 92 } 93 94 static void 95 checksum_changed_cb(void *arg, uint64_t newval) 96 { 97 objset_impl_t *osi = arg; 98 99 /* 100 * Inheritance should have been done by now. 101 */ 102 ASSERT(newval != ZIO_CHECKSUM_INHERIT); 103 104 osi->os_checksum = zio_checksum_select(newval, ZIO_CHECKSUM_ON_VALUE); 105 } 106 107 static void 108 compression_changed_cb(void *arg, uint64_t newval) 109 { 110 objset_impl_t *osi = arg; 111 112 /* 113 * Inheritance and range checking should have been done by now. 114 */ 115 ASSERT(newval != ZIO_COMPRESS_INHERIT); 116 117 osi->os_compress = zio_compress_select(newval, ZIO_COMPRESS_ON_VALUE); 118 } 119 120 static void 121 copies_changed_cb(void *arg, uint64_t newval) 122 { 123 objset_impl_t *osi = arg; 124 125 /* 126 * Inheritance and range checking should have been done by now. 127 */ 128 ASSERT(newval > 0); 129 ASSERT(newval <= spa_max_replication(osi->os_spa)); 130 131 osi->os_copies = newval; 132 } 133 134 static void 135 primary_cache_changed_cb(void *arg, uint64_t newval) 136 { 137 objset_impl_t *osi = arg; 138 139 /* 140 * Inheritance and range checking should have been done by now. 141 */ 142 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 143 newval == ZFS_CACHE_METADATA); 144 145 osi->os_primary_cache = newval; 146 } 147 148 static void 149 secondary_cache_changed_cb(void *arg, uint64_t newval) 150 { 151 objset_impl_t *osi = arg; 152 153 /* 154 * Inheritance and range checking should have been done by now. 155 */ 156 ASSERT(newval == ZFS_CACHE_ALL || newval == ZFS_CACHE_NONE || 157 newval == ZFS_CACHE_METADATA); 158 159 osi->os_secondary_cache = newval; 160 } 161 162 void 163 dmu_objset_byteswap(void *buf, size_t size) 164 { 165 objset_phys_t *osp = buf; 166 167 ASSERT(size == sizeof (objset_phys_t)); 168 dnode_byteswap(&osp->os_meta_dnode); 169 byteswap_uint64_array(&osp->os_zil_header, sizeof (zil_header_t)); 170 osp->os_type = BSWAP_64(osp->os_type); 171 } 172 173 int 174 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 175 objset_impl_t **osip) 176 { 177 objset_impl_t *osi; 178 int i, err; 179 180 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 181 182 osi = kmem_zalloc(sizeof (objset_impl_t), KM_SLEEP); 183 osi->os.os = osi; 184 osi->os_dsl_dataset = ds; 185 osi->os_spa = spa; 186 osi->os_rootbp = bp; 187 if (!BP_IS_HOLE(osi->os_rootbp)) { 188 uint32_t aflags = ARC_WAIT; 189 zbookmark_t zb; 190 zb.zb_objset = ds ? ds->ds_object : 0; 191 zb.zb_object = 0; 192 zb.zb_level = -1; 193 zb.zb_blkid = 0; 194 if (DMU_OS_IS_L2CACHEABLE(osi)) 195 aflags |= ARC_L2CACHE; 196 197 dprintf_bp(osi->os_rootbp, "reading %s", ""); 198 /* 199 * NB: when bprewrite scrub can change the bp, 200 * and this is called from dmu_objset_open_ds_os, the bp 201 * could change, and we'll need a lock. 202 */ 203 err = arc_read_nolock(NULL, spa, osi->os_rootbp, 204 arc_getbuf_func, &osi->os_phys_buf, 205 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 206 if (err) { 207 kmem_free(osi, sizeof (objset_impl_t)); 208 /* convert checksum errors into IO errors */ 209 if (err == ECKSUM) 210 err = EIO; 211 return (err); 212 } 213 osi->os_phys = osi->os_phys_buf->b_data; 214 } else { 215 osi->os_phys_buf = arc_buf_alloc(spa, sizeof (objset_phys_t), 216 &osi->os_phys_buf, ARC_BUFC_METADATA); 217 osi->os_phys = osi->os_phys_buf->b_data; 218 bzero(osi->os_phys, sizeof (objset_phys_t)); 219 } 220 221 /* 222 * Note: the changed_cb will be called once before the register 223 * func returns, thus changing the checksum/compression from the 224 * default (fletcher2/off). Snapshots don't need to know about 225 * checksum/compression/copies. 226 */ 227 if (ds) { 228 err = dsl_prop_register(ds, "primarycache", 229 primary_cache_changed_cb, osi); 230 if (err == 0) 231 err = dsl_prop_register(ds, "secondarycache", 232 secondary_cache_changed_cb, osi); 233 if (!dsl_dataset_is_snapshot(ds)) { 234 if (err == 0) 235 err = dsl_prop_register(ds, "checksum", 236 checksum_changed_cb, osi); 237 if (err == 0) 238 err = dsl_prop_register(ds, "compression", 239 compression_changed_cb, osi); 240 if (err == 0) 241 err = dsl_prop_register(ds, "copies", 242 copies_changed_cb, osi); 243 } 244 if (err) { 245 VERIFY(arc_buf_remove_ref(osi->os_phys_buf, 246 &osi->os_phys_buf) == 1); 247 kmem_free(osi, sizeof (objset_impl_t)); 248 return (err); 249 } 250 } else if (ds == NULL) { 251 /* It's the meta-objset. */ 252 osi->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 253 osi->os_compress = ZIO_COMPRESS_LZJB; 254 osi->os_copies = spa_max_replication(spa); 255 osi->os_primary_cache = ZFS_CACHE_ALL; 256 osi->os_secondary_cache = ZFS_CACHE_ALL; 257 } 258 259 osi->os_zil_header = osi->os_phys->os_zil_header; 260 osi->os_zil = zil_alloc(&osi->os, &osi->os_zil_header); 261 262 for (i = 0; i < TXG_SIZE; i++) { 263 list_create(&osi->os_dirty_dnodes[i], sizeof (dnode_t), 264 offsetof(dnode_t, dn_dirty_link[i])); 265 list_create(&osi->os_free_dnodes[i], sizeof (dnode_t), 266 offsetof(dnode_t, dn_dirty_link[i])); 267 } 268 list_create(&osi->os_dnodes, sizeof (dnode_t), 269 offsetof(dnode_t, dn_link)); 270 list_create(&osi->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 271 offsetof(dmu_buf_impl_t, db_link)); 272 273 mutex_init(&osi->os_lock, NULL, MUTEX_DEFAULT, NULL); 274 mutex_init(&osi->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 275 mutex_init(&osi->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 276 277 osi->os_meta_dnode = dnode_special_open(osi, 278 &osi->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT); 279 280 /* 281 * We should be the only thread trying to do this because we 282 * have ds_opening_lock 283 */ 284 if (ds) { 285 VERIFY(NULL == dsl_dataset_set_user_ptr(ds, osi, 286 dmu_objset_evict)); 287 } 288 289 *osip = osi; 290 return (0); 291 } 292 293 static int 294 dmu_objset_open_ds_os(dsl_dataset_t *ds, objset_t *os, dmu_objset_type_t type) 295 { 296 objset_impl_t *osi; 297 298 mutex_enter(&ds->ds_opening_lock); 299 osi = dsl_dataset_get_user_ptr(ds); 300 if (osi == NULL) { 301 int err; 302 303 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 304 ds, &ds->ds_phys->ds_bp, &osi); 305 if (err) { 306 mutex_exit(&ds->ds_opening_lock); 307 return (err); 308 } 309 } 310 mutex_exit(&ds->ds_opening_lock); 311 312 os->os = osi; 313 os->os_mode = DS_MODE_NOHOLD; 314 315 if (type != DMU_OST_ANY && type != os->os->os_phys->os_type) 316 return (EINVAL); 317 return (0); 318 } 319 320 int 321 dmu_objset_open_ds(dsl_dataset_t *ds, dmu_objset_type_t type, objset_t **osp) 322 { 323 objset_t *os; 324 int err; 325 326 os = kmem_alloc(sizeof (objset_t), KM_SLEEP); 327 err = dmu_objset_open_ds_os(ds, os, type); 328 if (err) 329 kmem_free(os, sizeof (objset_t)); 330 else 331 *osp = os; 332 return (err); 333 } 334 335 /* called from zpl */ 336 int 337 dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 338 objset_t **osp) 339 { 340 objset_t *os; 341 dsl_dataset_t *ds; 342 int err; 343 344 ASSERT(DS_MODE_TYPE(mode) == DS_MODE_USER || 345 DS_MODE_TYPE(mode) == DS_MODE_OWNER); 346 347 os = kmem_alloc(sizeof (objset_t), KM_SLEEP); 348 if (DS_MODE_TYPE(mode) == DS_MODE_USER) 349 err = dsl_dataset_hold(name, os, &ds); 350 else 351 err = dsl_dataset_own(name, mode, os, &ds); 352 if (err) { 353 kmem_free(os, sizeof (objset_t)); 354 return (err); 355 } 356 357 err = dmu_objset_open_ds_os(ds, os, type); 358 if (err) { 359 if (DS_MODE_TYPE(mode) == DS_MODE_USER) 360 dsl_dataset_rele(ds, os); 361 else 362 dsl_dataset_disown(ds, os); 363 kmem_free(os, sizeof (objset_t)); 364 } else { 365 os->os_mode = mode; 366 *osp = os; 367 } 368 return (err); 369 } 370 371 void 372 dmu_objset_close(objset_t *os) 373 { 374 ASSERT(DS_MODE_TYPE(os->os_mode) == DS_MODE_USER || 375 DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER || 376 DS_MODE_TYPE(os->os_mode) == DS_MODE_NOHOLD); 377 378 if (DS_MODE_TYPE(os->os_mode) == DS_MODE_USER) 379 dsl_dataset_rele(os->os->os_dsl_dataset, os); 380 else if (DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER) 381 dsl_dataset_disown(os->os->os_dsl_dataset, os); 382 kmem_free(os, sizeof (objset_t)); 383 } 384 385 int 386 dmu_objset_evict_dbufs(objset_t *os) 387 { 388 objset_impl_t *osi = os->os; 389 dnode_t *dn; 390 391 mutex_enter(&osi->os_lock); 392 393 /* process the mdn last, since the other dnodes have holds on it */ 394 list_remove(&osi->os_dnodes, osi->os_meta_dnode); 395 list_insert_tail(&osi->os_dnodes, osi->os_meta_dnode); 396 397 /* 398 * Find the first dnode with holds. We have to do this dance 399 * because dnode_add_ref() only works if you already have a 400 * hold. If there are no holds then it has no dbufs so OK to 401 * skip. 402 */ 403 for (dn = list_head(&osi->os_dnodes); 404 dn && !dnode_add_ref(dn, FTAG); 405 dn = list_next(&osi->os_dnodes, dn)) 406 continue; 407 408 while (dn) { 409 dnode_t *next_dn = dn; 410 411 do { 412 next_dn = list_next(&osi->os_dnodes, next_dn); 413 } while (next_dn && !dnode_add_ref(next_dn, FTAG)); 414 415 mutex_exit(&osi->os_lock); 416 dnode_evict_dbufs(dn); 417 dnode_rele(dn, FTAG); 418 mutex_enter(&osi->os_lock); 419 dn = next_dn; 420 } 421 mutex_exit(&osi->os_lock); 422 return (list_head(&osi->os_dnodes) != osi->os_meta_dnode); 423 } 424 425 void 426 dmu_objset_evict(dsl_dataset_t *ds, void *arg) 427 { 428 objset_impl_t *osi = arg; 429 objset_t os; 430 int i; 431 432 for (i = 0; i < TXG_SIZE; i++) { 433 ASSERT(list_head(&osi->os_dirty_dnodes[i]) == NULL); 434 ASSERT(list_head(&osi->os_free_dnodes[i]) == NULL); 435 } 436 437 if (ds) { 438 if (!dsl_dataset_is_snapshot(ds)) { 439 VERIFY(0 == dsl_prop_unregister(ds, "checksum", 440 checksum_changed_cb, osi)); 441 VERIFY(0 == dsl_prop_unregister(ds, "compression", 442 compression_changed_cb, osi)); 443 VERIFY(0 == dsl_prop_unregister(ds, "copies", 444 copies_changed_cb, osi)); 445 } 446 VERIFY(0 == dsl_prop_unregister(ds, "primarycache", 447 primary_cache_changed_cb, osi)); 448 VERIFY(0 == dsl_prop_unregister(ds, "secondarycache", 449 secondary_cache_changed_cb, osi)); 450 } 451 452 /* 453 * We should need only a single pass over the dnode list, since 454 * nothing can be added to the list at this point. 455 */ 456 os.os = osi; 457 (void) dmu_objset_evict_dbufs(&os); 458 459 ASSERT3P(list_head(&osi->os_dnodes), ==, osi->os_meta_dnode); 460 ASSERT3P(list_tail(&osi->os_dnodes), ==, osi->os_meta_dnode); 461 ASSERT3P(list_head(&osi->os_meta_dnode->dn_dbufs), ==, NULL); 462 463 dnode_special_close(osi->os_meta_dnode); 464 zil_free(osi->os_zil); 465 466 VERIFY(arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf) == 1); 467 mutex_destroy(&osi->os_lock); 468 mutex_destroy(&osi->os_obj_lock); 469 mutex_destroy(&osi->os_user_ptr_lock); 470 kmem_free(osi, sizeof (objset_impl_t)); 471 } 472 473 /* called from dsl for meta-objset */ 474 objset_impl_t * 475 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 476 dmu_objset_type_t type, dmu_tx_t *tx) 477 { 478 objset_impl_t *osi; 479 dnode_t *mdn; 480 481 ASSERT(dmu_tx_is_syncing(tx)); 482 if (ds) 483 mutex_enter(&ds->ds_opening_lock); 484 VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &osi)); 485 if (ds) 486 mutex_exit(&ds->ds_opening_lock); 487 mdn = osi->os_meta_dnode; 488 489 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 490 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 491 492 /* 493 * We don't want to have to increase the meta-dnode's nlevels 494 * later, because then we could do it in quescing context while 495 * we are also accessing it in open context. 496 * 497 * This precaution is not necessary for the MOS (ds == NULL), 498 * because the MOS is only updated in syncing context. 499 * This is most fortunate: the MOS is the only objset that 500 * needs to be synced multiple times as spa_sync() iterates 501 * to convergence, so minimizing its dn_nlevels matters. 502 */ 503 if (ds != NULL) { 504 int levels = 1; 505 506 /* 507 * Determine the number of levels necessary for the meta-dnode 508 * to contain DN_MAX_OBJECT dnodes. 509 */ 510 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 511 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 512 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 513 levels++; 514 515 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 516 mdn->dn_nlevels = levels; 517 } 518 519 ASSERT(type != DMU_OST_NONE); 520 ASSERT(type != DMU_OST_ANY); 521 ASSERT(type < DMU_OST_NUMTYPES); 522 osi->os_phys->os_type = type; 523 524 dsl_dataset_dirty(ds, tx); 525 526 return (osi); 527 } 528 529 struct oscarg { 530 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); 531 void *userarg; 532 dsl_dataset_t *clone_parent; 533 const char *lastname; 534 dmu_objset_type_t type; 535 uint64_t flags; 536 }; 537 538 /*ARGSUSED*/ 539 static int 540 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) 541 { 542 dsl_dir_t *dd = arg1; 543 struct oscarg *oa = arg2; 544 objset_t *mos = dd->dd_pool->dp_meta_objset; 545 int err; 546 uint64_t ddobj; 547 548 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 549 oa->lastname, sizeof (uint64_t), 1, &ddobj); 550 if (err != ENOENT) 551 return (err ? err : EEXIST); 552 553 if (oa->clone_parent != NULL) { 554 /* 555 * You can't clone across pools. 556 */ 557 if (oa->clone_parent->ds_dir->dd_pool != dd->dd_pool) 558 return (EXDEV); 559 560 /* 561 * You can only clone snapshots, not the head datasets. 562 */ 563 if (oa->clone_parent->ds_phys->ds_num_children == 0) 564 return (EINVAL); 565 } 566 567 return (0); 568 } 569 570 static void 571 dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 572 { 573 dsl_dir_t *dd = arg1; 574 struct oscarg *oa = arg2; 575 dsl_dataset_t *ds; 576 blkptr_t *bp; 577 uint64_t dsobj; 578 579 ASSERT(dmu_tx_is_syncing(tx)); 580 581 dsobj = dsl_dataset_create_sync(dd, oa->lastname, 582 oa->clone_parent, oa->flags, cr, tx); 583 584 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj, FTAG, &ds)); 585 bp = dsl_dataset_get_blkptr(ds); 586 if (BP_IS_HOLE(bp)) { 587 objset_impl_t *osi; 588 589 /* This is an empty dmu_objset; not a clone. */ 590 osi = dmu_objset_create_impl(dsl_dataset_get_spa(ds), 591 ds, bp, oa->type, tx); 592 593 if (oa->userfunc) 594 oa->userfunc(&osi->os, oa->userarg, cr, tx); 595 } 596 597 spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa, 598 tx, cr, "dataset = %llu", dsobj); 599 600 dsl_dataset_rele(ds, FTAG); 601 } 602 603 int 604 dmu_objset_create(const char *name, dmu_objset_type_t type, 605 objset_t *clone_parent, uint64_t flags, 606 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 607 { 608 dsl_dir_t *pdd; 609 const char *tail; 610 int err = 0; 611 struct oscarg oa = { 0 }; 612 613 ASSERT(strchr(name, '@') == NULL); 614 err = dsl_dir_open(name, FTAG, &pdd, &tail); 615 if (err) 616 return (err); 617 if (tail == NULL) { 618 dsl_dir_close(pdd, FTAG); 619 return (EEXIST); 620 } 621 622 dprintf("name=%s\n", name); 623 624 oa.userfunc = func; 625 oa.userarg = arg; 626 oa.lastname = tail; 627 oa.type = type; 628 oa.flags = flags; 629 630 if (clone_parent != NULL) { 631 /* 632 * You can't clone to a different type. 633 */ 634 if (clone_parent->os->os_phys->os_type != type) { 635 dsl_dir_close(pdd, FTAG); 636 return (EINVAL); 637 } 638 oa.clone_parent = clone_parent->os->os_dsl_dataset; 639 } 640 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 641 dmu_objset_create_sync, pdd, &oa, 5); 642 dsl_dir_close(pdd, FTAG); 643 return (err); 644 } 645 646 int 647 dmu_objset_destroy(const char *name) 648 { 649 objset_t *os; 650 int error; 651 652 /* 653 * If it looks like we'll be able to destroy it, and there's 654 * an unplayed replay log sitting around, destroy the log. 655 * It would be nicer to do this in dsl_dataset_destroy_sync(), 656 * but the replay log objset is modified in open context. 657 */ 658 error = dmu_objset_open(name, DMU_OST_ANY, 659 DS_MODE_OWNER|DS_MODE_READONLY|DS_MODE_INCONSISTENT, &os); 660 if (error == 0) { 661 dsl_dataset_t *ds = os->os->os_dsl_dataset; 662 zil_destroy(dmu_objset_zil(os), B_FALSE); 663 664 error = dsl_dataset_destroy(ds, os); 665 /* 666 * dsl_dataset_destroy() closes the ds. 667 */ 668 kmem_free(os, sizeof (objset_t)); 669 } 670 671 return (error); 672 } 673 674 /* 675 * This will close the objset. 676 */ 677 int 678 dmu_objset_rollback(objset_t *os) 679 { 680 int err; 681 dsl_dataset_t *ds; 682 683 ds = os->os->os_dsl_dataset; 684 685 if (!dsl_dataset_tryown(ds, TRUE, os)) { 686 dmu_objset_close(os); 687 return (EBUSY); 688 } 689 690 err = dsl_dataset_rollback(ds, os->os->os_phys->os_type); 691 692 /* 693 * NB: we close the objset manually because the rollback 694 * actually implicitly called dmu_objset_evict(), thus freeing 695 * the objset_impl_t. 696 */ 697 dsl_dataset_disown(ds, os); 698 kmem_free(os, sizeof (objset_t)); 699 return (err); 700 } 701 702 struct snaparg { 703 dsl_sync_task_group_t *dstg; 704 char *snapname; 705 char failed[MAXPATHLEN]; 706 boolean_t checkperms; 707 list_t objsets; 708 }; 709 710 struct osnode { 711 list_node_t node; 712 objset_t *os; 713 }; 714 715 static int 716 dmu_objset_snapshot_one(char *name, void *arg) 717 { 718 struct snaparg *sn = arg; 719 objset_t *os; 720 int err; 721 722 (void) strcpy(sn->failed, name); 723 724 /* 725 * Check permissions only when requested. This only applies when 726 * doing a recursive snapshot. The permission checks for the starting 727 * dataset have already been performed in zfs_secpolicy_snapshot() 728 */ 729 if (sn->checkperms == B_TRUE && 730 (err = zfs_secpolicy_snapshot_perms(name, CRED()))) 731 return (err); 732 733 err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_USER, &os); 734 if (err != 0) 735 return (err); 736 737 /* If the objset is in an inconsistent state, return busy */ 738 if (os->os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) { 739 dmu_objset_close(os); 740 return (EBUSY); 741 } 742 743 /* 744 * NB: we need to wait for all in-flight changes to get to disk, 745 * so that we snapshot those changes. zil_suspend does this as 746 * a side effect. 747 */ 748 err = zil_suspend(dmu_objset_zil(os)); 749 if (err == 0) { 750 struct osnode *osn; 751 dsl_sync_task_create(sn->dstg, dsl_dataset_snapshot_check, 752 dsl_dataset_snapshot_sync, os->os->os_dsl_dataset, 753 sn->snapname, 3); 754 osn = kmem_alloc(sizeof (struct osnode), KM_SLEEP); 755 osn->os = os; 756 list_insert_tail(&sn->objsets, osn); 757 } else { 758 dmu_objset_close(os); 759 } 760 761 return (err); 762 } 763 764 int 765 dmu_objset_snapshot(char *fsname, char *snapname, boolean_t recursive) 766 { 767 dsl_sync_task_t *dst; 768 struct osnode *osn; 769 struct snaparg sn = { 0 }; 770 spa_t *spa; 771 int err; 772 773 (void) strcpy(sn.failed, fsname); 774 775 err = spa_open(fsname, &spa, FTAG); 776 if (err) 777 return (err); 778 779 sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 780 sn.snapname = snapname; 781 list_create(&sn.objsets, sizeof (struct osnode), 782 offsetof(struct osnode, node)); 783 784 if (recursive) { 785 sn.checkperms = B_TRUE; 786 err = dmu_objset_find(fsname, 787 dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); 788 } else { 789 sn.checkperms = B_FALSE; 790 err = dmu_objset_snapshot_one(fsname, &sn); 791 } 792 793 if (err) 794 goto out; 795 796 err = dsl_sync_task_group_wait(sn.dstg); 797 798 for (dst = list_head(&sn.dstg->dstg_tasks); dst; 799 dst = list_next(&sn.dstg->dstg_tasks, dst)) { 800 dsl_dataset_t *ds = dst->dst_arg1; 801 if (dst->dst_err) 802 dsl_dataset_name(ds, sn.failed); 803 } 804 805 out: 806 while (osn = list_head(&sn.objsets)) { 807 list_remove(&sn.objsets, osn); 808 zil_resume(dmu_objset_zil(osn->os)); 809 dmu_objset_close(osn->os); 810 kmem_free(osn, sizeof (struct osnode)); 811 } 812 list_destroy(&sn.objsets); 813 814 if (err) 815 (void) strcpy(fsname, sn.failed); 816 dsl_sync_task_group_destroy(sn.dstg); 817 spa_close(spa, FTAG); 818 return (err); 819 } 820 821 static void 822 dmu_objset_sync_dnodes(list_t *list, dmu_tx_t *tx) 823 { 824 dnode_t *dn; 825 826 while (dn = list_head(list)) { 827 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 828 ASSERT(dn->dn_dbuf->db_data_pending); 829 /* 830 * Initialize dn_zio outside dnode_sync() 831 * to accomodate meta-dnode 832 */ 833 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 834 ASSERT(dn->dn_zio); 835 836 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 837 list_remove(list, dn); 838 dnode_sync(dn, tx); 839 } 840 } 841 842 /* ARGSUSED */ 843 static void 844 ready(zio_t *zio, arc_buf_t *abuf, void *arg) 845 { 846 blkptr_t *bp = zio->io_bp; 847 blkptr_t *bp_orig = &zio->io_bp_orig; 848 objset_impl_t *os = arg; 849 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 850 851 ASSERT(bp == os->os_rootbp); 852 ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET); 853 ASSERT(BP_GET_LEVEL(bp) == 0); 854 855 /* 856 * Update rootbp fill count. 857 */ 858 bp->blk_fill = 1; /* count the meta-dnode */ 859 for (int i = 0; i < dnp->dn_nblkptr; i++) 860 bp->blk_fill += dnp->dn_blkptr[i].blk_fill; 861 862 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 863 ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig))); 864 } else { 865 if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg) 866 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 867 &zio->io_bp_orig, zio, os->os_synctx); 868 dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx); 869 } 870 } 871 872 /* called from dsl */ 873 void 874 dmu_objset_sync(objset_impl_t *os, zio_t *pio, dmu_tx_t *tx) 875 { 876 int txgoff; 877 zbookmark_t zb; 878 writeprops_t wp = { 0 }; 879 zio_t *zio; 880 list_t *list; 881 dbuf_dirty_record_t *dr; 882 883 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 884 885 ASSERT(dmu_tx_is_syncing(tx)); 886 /* XXX the write_done callback should really give us the tx... */ 887 os->os_synctx = tx; 888 889 if (os->os_dsl_dataset == NULL) { 890 /* 891 * This is the MOS. If we have upgraded, 892 * spa_max_replication() could change, so reset 893 * os_copies here. 894 */ 895 os->os_copies = spa_max_replication(os->os_spa); 896 } 897 898 /* 899 * Create the root block IO 900 */ 901 zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 902 zb.zb_object = 0; 903 zb.zb_level = -1; /* for block ordering; it's level 0 on disk */ 904 zb.zb_blkid = 0; 905 906 wp.wp_type = DMU_OT_OBJSET; 907 wp.wp_level = 0; /* on-disk BP level; see above */ 908 wp.wp_copies = os->os_copies; 909 wp.wp_oschecksum = os->os_checksum; 910 wp.wp_oscompress = os->os_compress; 911 912 if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) { 913 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 914 os->os_rootbp, pio, tx); 915 } 916 917 arc_release(os->os_phys_buf, &os->os_phys_buf); 918 zio = arc_write(pio, os->os_spa, &wp, DMU_OS_IS_L2CACHEABLE(os), 919 tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, NULL, os, 920 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 921 922 /* 923 * Sync meta-dnode - the parent IO for the sync is the root block 924 */ 925 os->os_meta_dnode->dn_zio = zio; 926 dnode_sync(os->os_meta_dnode, tx); 927 928 txgoff = tx->tx_txg & TXG_MASK; 929 930 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], tx); 931 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], tx); 932 933 list = &os->os_meta_dnode->dn_dirty_records[txgoff]; 934 while (dr = list_head(list)) { 935 ASSERT(dr->dr_dbuf->db_level == 0); 936 list_remove(list, dr); 937 if (dr->dr_zio) 938 zio_nowait(dr->dr_zio); 939 } 940 /* 941 * Free intent log blocks up to this tx. 942 */ 943 zil_sync(os->os_zil, tx); 944 os->os_phys->os_zil_header = os->os_zil_header; 945 zio_nowait(zio); 946 } 947 948 void 949 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 950 uint64_t *usedobjsp, uint64_t *availobjsp) 951 { 952 dsl_dataset_space(os->os->os_dsl_dataset, refdbytesp, availbytesp, 953 usedobjsp, availobjsp); 954 } 955 956 uint64_t 957 dmu_objset_fsid_guid(objset_t *os) 958 { 959 return (dsl_dataset_fsid_guid(os->os->os_dsl_dataset)); 960 } 961 962 void 963 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 964 { 965 stat->dds_type = os->os->os_phys->os_type; 966 if (os->os->os_dsl_dataset) 967 dsl_dataset_fast_stat(os->os->os_dsl_dataset, stat); 968 } 969 970 void 971 dmu_objset_stats(objset_t *os, nvlist_t *nv) 972 { 973 ASSERT(os->os->os_dsl_dataset || 974 os->os->os_phys->os_type == DMU_OST_META); 975 976 if (os->os->os_dsl_dataset != NULL) 977 dsl_dataset_stats(os->os->os_dsl_dataset, nv); 978 979 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 980 os->os->os_phys->os_type); 981 } 982 983 int 984 dmu_objset_is_snapshot(objset_t *os) 985 { 986 if (os->os->os_dsl_dataset != NULL) 987 return (dsl_dataset_is_snapshot(os->os->os_dsl_dataset)); 988 else 989 return (B_FALSE); 990 } 991 992 int 993 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 994 boolean_t *conflict) 995 { 996 dsl_dataset_t *ds = os->os->os_dsl_dataset; 997 uint64_t ignored; 998 999 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1000 return (ENOENT); 1001 1002 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1003 ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST, 1004 real, maxlen, conflict)); 1005 } 1006 1007 int 1008 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1009 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1010 { 1011 dsl_dataset_t *ds = os->os->os_dsl_dataset; 1012 zap_cursor_t cursor; 1013 zap_attribute_t attr; 1014 1015 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1016 return (ENOENT); 1017 1018 zap_cursor_init_serialized(&cursor, 1019 ds->ds_dir->dd_pool->dp_meta_objset, 1020 ds->ds_phys->ds_snapnames_zapobj, *offp); 1021 1022 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1023 zap_cursor_fini(&cursor); 1024 return (ENOENT); 1025 } 1026 1027 if (strlen(attr.za_name) + 1 > namelen) { 1028 zap_cursor_fini(&cursor); 1029 return (ENAMETOOLONG); 1030 } 1031 1032 (void) strcpy(name, attr.za_name); 1033 if (idp) 1034 *idp = attr.za_first_integer; 1035 if (case_conflict) 1036 *case_conflict = attr.za_normalization_conflict; 1037 zap_cursor_advance(&cursor); 1038 *offp = zap_cursor_serialize(&cursor); 1039 zap_cursor_fini(&cursor); 1040 1041 return (0); 1042 } 1043 1044 int 1045 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1046 uint64_t *idp, uint64_t *offp) 1047 { 1048 dsl_dir_t *dd = os->os->os_dsl_dataset->ds_dir; 1049 zap_cursor_t cursor; 1050 zap_attribute_t attr; 1051 1052 /* there is no next dir on a snapshot! */ 1053 if (os->os->os_dsl_dataset->ds_object != 1054 dd->dd_phys->dd_head_dataset_obj) 1055 return (ENOENT); 1056 1057 zap_cursor_init_serialized(&cursor, 1058 dd->dd_pool->dp_meta_objset, 1059 dd->dd_phys->dd_child_dir_zapobj, *offp); 1060 1061 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1062 zap_cursor_fini(&cursor); 1063 return (ENOENT); 1064 } 1065 1066 if (strlen(attr.za_name) + 1 > namelen) { 1067 zap_cursor_fini(&cursor); 1068 return (ENAMETOOLONG); 1069 } 1070 1071 (void) strcpy(name, attr.za_name); 1072 if (idp) 1073 *idp = attr.za_first_integer; 1074 zap_cursor_advance(&cursor); 1075 *offp = zap_cursor_serialize(&cursor); 1076 zap_cursor_fini(&cursor); 1077 1078 return (0); 1079 } 1080 1081 struct findarg { 1082 int (*func)(char *, void *); 1083 void *arg; 1084 }; 1085 1086 /* ARGSUSED */ 1087 static int 1088 findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) 1089 { 1090 struct findarg *fa = arg; 1091 return (fa->func((char *)dsname, fa->arg)); 1092 } 1093 1094 /* 1095 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1096 * Perhaps change all callers to use dmu_objset_find_spa()? 1097 */ 1098 int 1099 dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags) 1100 { 1101 struct findarg fa; 1102 fa.func = func; 1103 fa.arg = arg; 1104 return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags)); 1105 } 1106 1107 /* 1108 * Find all objsets under name, call func on each 1109 */ 1110 int 1111 dmu_objset_find_spa(spa_t *spa, const char *name, 1112 int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags) 1113 { 1114 dsl_dir_t *dd; 1115 dsl_pool_t *dp; 1116 dsl_dataset_t *ds; 1117 zap_cursor_t zc; 1118 zap_attribute_t *attr; 1119 char *child; 1120 uint64_t thisobj; 1121 int err; 1122 1123 if (name == NULL) 1124 name = spa_name(spa); 1125 err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL); 1126 if (err) 1127 return (err); 1128 1129 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1130 if (dd->dd_myname[0] == '$') { 1131 dsl_dir_close(dd, FTAG); 1132 return (0); 1133 } 1134 1135 thisobj = dd->dd_phys->dd_head_dataset_obj; 1136 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1137 dp = dd->dd_pool; 1138 1139 /* 1140 * Iterate over all children. 1141 */ 1142 if (flags & DS_FIND_CHILDREN) { 1143 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1144 dd->dd_phys->dd_child_dir_zapobj); 1145 zap_cursor_retrieve(&zc, attr) == 0; 1146 (void) zap_cursor_advance(&zc)) { 1147 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 1148 ASSERT(attr->za_num_integers == 1); 1149 1150 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1151 (void) strcpy(child, name); 1152 (void) strcat(child, "/"); 1153 (void) strcat(child, attr->za_name); 1154 err = dmu_objset_find_spa(spa, child, func, arg, flags); 1155 kmem_free(child, MAXPATHLEN); 1156 if (err) 1157 break; 1158 } 1159 zap_cursor_fini(&zc); 1160 1161 if (err) { 1162 dsl_dir_close(dd, FTAG); 1163 kmem_free(attr, sizeof (zap_attribute_t)); 1164 return (err); 1165 } 1166 } 1167 1168 /* 1169 * Iterate over all snapshots. 1170 */ 1171 if (flags & DS_FIND_SNAPSHOTS) { 1172 if (!dsl_pool_sync_context(dp)) 1173 rw_enter(&dp->dp_config_rwlock, RW_READER); 1174 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1175 if (!dsl_pool_sync_context(dp)) 1176 rw_exit(&dp->dp_config_rwlock); 1177 1178 if (err == 0) { 1179 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 1180 dsl_dataset_rele(ds, FTAG); 1181 1182 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1183 zap_cursor_retrieve(&zc, attr) == 0; 1184 (void) zap_cursor_advance(&zc)) { 1185 ASSERT(attr->za_integer_length == 1186 sizeof (uint64_t)); 1187 ASSERT(attr->za_num_integers == 1); 1188 1189 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1190 (void) strcpy(child, name); 1191 (void) strcat(child, "@"); 1192 (void) strcat(child, attr->za_name); 1193 err = func(spa, attr->za_first_integer, 1194 child, arg); 1195 kmem_free(child, MAXPATHLEN); 1196 if (err) 1197 break; 1198 } 1199 zap_cursor_fini(&zc); 1200 } 1201 } 1202 1203 dsl_dir_close(dd, FTAG); 1204 kmem_free(attr, sizeof (zap_attribute_t)); 1205 1206 if (err) 1207 return (err); 1208 1209 /* 1210 * Apply to self if appropriate. 1211 */ 1212 err = func(spa, thisobj, name, arg); 1213 return (err); 1214 } 1215 1216 void 1217 dmu_objset_set_user(objset_t *os, void *user_ptr) 1218 { 1219 ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock)); 1220 os->os->os_user_ptr = user_ptr; 1221 } 1222 1223 void * 1224 dmu_objset_get_user(objset_t *os) 1225 { 1226 ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock)); 1227 return (os->os->os_user_ptr); 1228 } 1229