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->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 == OBJSET_OLD_PHYS_SIZE || 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 osp->os_flags = BSWAP_64(osp->os_flags); 172 if (size == sizeof (objset_phys_t)) { 173 dnode_byteswap(&osp->os_userused_dnode); 174 dnode_byteswap(&osp->os_groupused_dnode); 175 } 176 } 177 178 int 179 dmu_objset_open_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 180 objset_impl_t **osip) 181 { 182 objset_impl_t *osi; 183 int i, err; 184 185 ASSERT(ds == NULL || MUTEX_HELD(&ds->ds_opening_lock)); 186 187 osi = kmem_zalloc(sizeof (objset_impl_t), KM_SLEEP); 188 osi->os.os = osi; 189 osi->os_dsl_dataset = ds; 190 osi->os_spa = spa; 191 osi->os_rootbp = bp; 192 if (!BP_IS_HOLE(osi->os_rootbp)) { 193 uint32_t aflags = ARC_WAIT; 194 zbookmark_t zb; 195 zb.zb_objset = ds ? ds->ds_object : 0; 196 zb.zb_object = 0; 197 zb.zb_level = -1; 198 zb.zb_blkid = 0; 199 if (DMU_OS_IS_L2CACHEABLE(osi)) 200 aflags |= ARC_L2CACHE; 201 202 dprintf_bp(osi->os_rootbp, "reading %s", ""); 203 /* 204 * NB: when bprewrite scrub can change the bp, 205 * and this is called from dmu_objset_open_ds_os, the bp 206 * could change, and we'll need a lock. 207 */ 208 err = arc_read_nolock(NULL, spa, osi->os_rootbp, 209 arc_getbuf_func, &osi->os_phys_buf, 210 ZIO_PRIORITY_SYNC_READ, ZIO_FLAG_CANFAIL, &aflags, &zb); 211 if (err) { 212 kmem_free(osi, sizeof (objset_impl_t)); 213 /* convert checksum errors into IO errors */ 214 if (err == ECKSUM) 215 err = EIO; 216 return (err); 217 } 218 219 /* Increase the blocksize if we are permitted. */ 220 if (spa_version(spa) >= SPA_VERSION_USERSPACE && 221 arc_buf_size(osi->os_phys_buf) < sizeof (objset_phys_t)) { 222 arc_buf_t *buf = arc_buf_alloc(spa, 223 sizeof (objset_phys_t), &osi->os_phys_buf, 224 ARC_BUFC_METADATA); 225 bzero(buf->b_data, sizeof (objset_phys_t)); 226 bcopy(osi->os_phys_buf->b_data, buf->b_data, 227 arc_buf_size(osi->os_phys_buf)); 228 arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf); 229 osi->os_phys_buf = buf; 230 } 231 232 osi->os_phys = osi->os_phys_buf->b_data; 233 osi->os_flags = osi->os_phys->os_flags; 234 } else { 235 int size = spa_version(spa) >= SPA_VERSION_USERSPACE ? 236 sizeof (objset_phys_t) : OBJSET_OLD_PHYS_SIZE; 237 osi->os_phys_buf = arc_buf_alloc(spa, size, 238 &osi->os_phys_buf, ARC_BUFC_METADATA); 239 osi->os_phys = osi->os_phys_buf->b_data; 240 bzero(osi->os_phys, size); 241 } 242 243 /* 244 * Note: the changed_cb will be called once before the register 245 * func returns, thus changing the checksum/compression from the 246 * default (fletcher2/off). Snapshots don't need to know about 247 * checksum/compression/copies. 248 */ 249 if (ds) { 250 err = dsl_prop_register(ds, "primarycache", 251 primary_cache_changed_cb, osi); 252 if (err == 0) 253 err = dsl_prop_register(ds, "secondarycache", 254 secondary_cache_changed_cb, osi); 255 if (!dsl_dataset_is_snapshot(ds)) { 256 if (err == 0) 257 err = dsl_prop_register(ds, "checksum", 258 checksum_changed_cb, osi); 259 if (err == 0) 260 err = dsl_prop_register(ds, "compression", 261 compression_changed_cb, osi); 262 if (err == 0) 263 err = dsl_prop_register(ds, "copies", 264 copies_changed_cb, osi); 265 } 266 if (err) { 267 VERIFY(arc_buf_remove_ref(osi->os_phys_buf, 268 &osi->os_phys_buf) == 1); 269 kmem_free(osi, sizeof (objset_impl_t)); 270 return (err); 271 } 272 } else if (ds == NULL) { 273 /* It's the meta-objset. */ 274 osi->os_checksum = ZIO_CHECKSUM_FLETCHER_4; 275 osi->os_compress = ZIO_COMPRESS_LZJB; 276 osi->os_copies = spa_max_replication(spa); 277 osi->os_primary_cache = ZFS_CACHE_ALL; 278 osi->os_secondary_cache = ZFS_CACHE_ALL; 279 } 280 281 osi->os_zil_header = osi->os_phys->os_zil_header; 282 osi->os_zil = zil_alloc(&osi->os, &osi->os_zil_header); 283 284 for (i = 0; i < TXG_SIZE; i++) { 285 list_create(&osi->os_dirty_dnodes[i], sizeof (dnode_t), 286 offsetof(dnode_t, dn_dirty_link[i])); 287 list_create(&osi->os_free_dnodes[i], sizeof (dnode_t), 288 offsetof(dnode_t, dn_dirty_link[i])); 289 } 290 list_create(&osi->os_dnodes, sizeof (dnode_t), 291 offsetof(dnode_t, dn_link)); 292 list_create(&osi->os_downgraded_dbufs, sizeof (dmu_buf_impl_t), 293 offsetof(dmu_buf_impl_t, db_link)); 294 295 mutex_init(&osi->os_lock, NULL, MUTEX_DEFAULT, NULL); 296 mutex_init(&osi->os_obj_lock, NULL, MUTEX_DEFAULT, NULL); 297 mutex_init(&osi->os_user_ptr_lock, NULL, MUTEX_DEFAULT, NULL); 298 299 osi->os_meta_dnode = dnode_special_open(osi, 300 &osi->os_phys->os_meta_dnode, DMU_META_DNODE_OBJECT); 301 if (arc_buf_size(osi->os_phys_buf) >= sizeof (objset_phys_t)) { 302 osi->os_userused_dnode = dnode_special_open(osi, 303 &osi->os_phys->os_userused_dnode, DMU_USERUSED_OBJECT); 304 osi->os_groupused_dnode = dnode_special_open(osi, 305 &osi->os_phys->os_groupused_dnode, DMU_GROUPUSED_OBJECT); 306 } 307 308 /* 309 * We should be the only thread trying to do this because we 310 * have ds_opening_lock 311 */ 312 if (ds) { 313 VERIFY(NULL == dsl_dataset_set_user_ptr(ds, osi, 314 dmu_objset_evict)); 315 } 316 317 *osip = osi; 318 return (0); 319 } 320 321 static int 322 dmu_objset_open_ds_os(dsl_dataset_t *ds, objset_t *os, dmu_objset_type_t type) 323 { 324 objset_impl_t *osi; 325 326 mutex_enter(&ds->ds_opening_lock); 327 osi = dsl_dataset_get_user_ptr(ds); 328 if (osi == NULL) { 329 int err; 330 331 err = dmu_objset_open_impl(dsl_dataset_get_spa(ds), 332 ds, &ds->ds_phys->ds_bp, &osi); 333 if (err) { 334 mutex_exit(&ds->ds_opening_lock); 335 return (err); 336 } 337 } 338 mutex_exit(&ds->ds_opening_lock); 339 340 os->os = osi; 341 os->os_mode = DS_MODE_NOHOLD; 342 343 if (type != DMU_OST_ANY && type != os->os->os_phys->os_type) 344 return (EINVAL); 345 return (0); 346 } 347 348 int 349 dmu_objset_open_ds(dsl_dataset_t *ds, dmu_objset_type_t type, objset_t **osp) 350 { 351 objset_t *os; 352 int err; 353 354 os = kmem_alloc(sizeof (objset_t), KM_SLEEP); 355 err = dmu_objset_open_ds_os(ds, os, type); 356 if (err) 357 kmem_free(os, sizeof (objset_t)); 358 else 359 *osp = os; 360 return (err); 361 } 362 363 /* called from zpl */ 364 int 365 dmu_objset_open(const char *name, dmu_objset_type_t type, int mode, 366 objset_t **osp) 367 { 368 objset_t *os; 369 dsl_dataset_t *ds; 370 int err; 371 372 ASSERT(DS_MODE_TYPE(mode) == DS_MODE_USER || 373 DS_MODE_TYPE(mode) == DS_MODE_OWNER); 374 375 os = kmem_alloc(sizeof (objset_t), KM_SLEEP); 376 if (DS_MODE_TYPE(mode) == DS_MODE_USER) 377 err = dsl_dataset_hold(name, os, &ds); 378 else 379 err = dsl_dataset_own(name, mode, os, &ds); 380 if (err) { 381 kmem_free(os, sizeof (objset_t)); 382 return (err); 383 } 384 385 err = dmu_objset_open_ds_os(ds, os, type); 386 if (err) { 387 if (DS_MODE_TYPE(mode) == DS_MODE_USER) 388 dsl_dataset_rele(ds, os); 389 else 390 dsl_dataset_disown(ds, os); 391 kmem_free(os, sizeof (objset_t)); 392 } else { 393 os->os_mode = mode; 394 *osp = os; 395 } 396 return (err); 397 } 398 399 void 400 dmu_objset_close(objset_t *os) 401 { 402 ASSERT(DS_MODE_TYPE(os->os_mode) == DS_MODE_USER || 403 DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER || 404 DS_MODE_TYPE(os->os_mode) == DS_MODE_NOHOLD); 405 406 if (DS_MODE_TYPE(os->os_mode) == DS_MODE_USER) 407 dsl_dataset_rele(os->os->os_dsl_dataset, os); 408 else if (DS_MODE_TYPE(os->os_mode) == DS_MODE_OWNER) 409 dsl_dataset_disown(os->os->os_dsl_dataset, os); 410 kmem_free(os, sizeof (objset_t)); 411 } 412 413 int 414 dmu_objset_evict_dbufs(objset_t *os) 415 { 416 objset_impl_t *osi = os->os; 417 dnode_t *dn; 418 419 mutex_enter(&osi->os_lock); 420 421 /* process the mdn last, since the other dnodes have holds on it */ 422 list_remove(&osi->os_dnodes, osi->os_meta_dnode); 423 list_insert_tail(&osi->os_dnodes, osi->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(&osi->os_dnodes); 432 dn && !dnode_add_ref(dn, FTAG); 433 dn = list_next(&osi->os_dnodes, dn)) 434 continue; 435 436 while (dn) { 437 dnode_t *next_dn = dn; 438 439 do { 440 next_dn = list_next(&osi->os_dnodes, next_dn); 441 } while (next_dn && !dnode_add_ref(next_dn, FTAG)); 442 443 mutex_exit(&osi->os_lock); 444 dnode_evict_dbufs(dn); 445 dnode_rele(dn, FTAG); 446 mutex_enter(&osi->os_lock); 447 dn = next_dn; 448 } 449 mutex_exit(&osi->os_lock); 450 return (list_head(&osi->os_dnodes) != osi->os_meta_dnode); 451 } 452 453 void 454 dmu_objset_evict(dsl_dataset_t *ds, void *arg) 455 { 456 objset_impl_t *osi = arg; 457 objset_t os; 458 int i; 459 460 for (i = 0; i < TXG_SIZE; i++) { 461 ASSERT(list_head(&osi->os_dirty_dnodes[i]) == NULL); 462 ASSERT(list_head(&osi->os_free_dnodes[i]) == NULL); 463 } 464 465 if (ds) { 466 if (!dsl_dataset_is_snapshot(ds)) { 467 VERIFY(0 == dsl_prop_unregister(ds, "checksum", 468 checksum_changed_cb, osi)); 469 VERIFY(0 == dsl_prop_unregister(ds, "compression", 470 compression_changed_cb, osi)); 471 VERIFY(0 == dsl_prop_unregister(ds, "copies", 472 copies_changed_cb, osi)); 473 } 474 VERIFY(0 == dsl_prop_unregister(ds, "primarycache", 475 primary_cache_changed_cb, osi)); 476 VERIFY(0 == dsl_prop_unregister(ds, "secondarycache", 477 secondary_cache_changed_cb, osi)); 478 } 479 480 /* 481 * We should need only a single pass over the dnode list, since 482 * nothing can be added to the list at this point. 483 */ 484 os.os = osi; 485 (void) dmu_objset_evict_dbufs(&os); 486 487 dnode_special_close(osi->os_meta_dnode); 488 if (osi->os_userused_dnode) { 489 dnode_special_close(osi->os_userused_dnode); 490 dnode_special_close(osi->os_groupused_dnode); 491 } 492 zil_free(osi->os_zil); 493 494 ASSERT3P(list_head(&osi->os_dnodes), ==, NULL); 495 496 VERIFY(arc_buf_remove_ref(osi->os_phys_buf, &osi->os_phys_buf) == 1); 497 mutex_destroy(&osi->os_lock); 498 mutex_destroy(&osi->os_obj_lock); 499 mutex_destroy(&osi->os_user_ptr_lock); 500 kmem_free(osi, sizeof (objset_impl_t)); 501 } 502 503 /* called from dsl for meta-objset */ 504 objset_impl_t * 505 dmu_objset_create_impl(spa_t *spa, dsl_dataset_t *ds, blkptr_t *bp, 506 dmu_objset_type_t type, dmu_tx_t *tx) 507 { 508 objset_impl_t *osi; 509 dnode_t *mdn; 510 511 ASSERT(dmu_tx_is_syncing(tx)); 512 if (ds) 513 mutex_enter(&ds->ds_opening_lock); 514 VERIFY(0 == dmu_objset_open_impl(spa, ds, bp, &osi)); 515 if (ds) 516 mutex_exit(&ds->ds_opening_lock); 517 mdn = osi->os_meta_dnode; 518 519 dnode_allocate(mdn, DMU_OT_DNODE, 1 << DNODE_BLOCK_SHIFT, 520 DN_MAX_INDBLKSHIFT, DMU_OT_NONE, 0, tx); 521 522 /* 523 * We don't want to have to increase the meta-dnode's nlevels 524 * later, because then we could do it in quescing context while 525 * we are also accessing it in open context. 526 * 527 * This precaution is not necessary for the MOS (ds == NULL), 528 * because the MOS is only updated in syncing context. 529 * This is most fortunate: the MOS is the only objset that 530 * needs to be synced multiple times as spa_sync() iterates 531 * to convergence, so minimizing its dn_nlevels matters. 532 */ 533 if (ds != NULL) { 534 int levels = 1; 535 536 /* 537 * Determine the number of levels necessary for the meta-dnode 538 * to contain DN_MAX_OBJECT dnodes. 539 */ 540 while ((uint64_t)mdn->dn_nblkptr << (mdn->dn_datablkshift + 541 (levels - 1) * (mdn->dn_indblkshift - SPA_BLKPTRSHIFT)) < 542 DN_MAX_OBJECT * sizeof (dnode_phys_t)) 543 levels++; 544 545 mdn->dn_next_nlevels[tx->tx_txg & TXG_MASK] = 546 mdn->dn_nlevels = levels; 547 } 548 549 ASSERT(type != DMU_OST_NONE); 550 ASSERT(type != DMU_OST_ANY); 551 ASSERT(type < DMU_OST_NUMTYPES); 552 osi->os_phys->os_type = type; 553 if (dmu_objset_userused_enabled(osi)) { 554 osi->os_phys->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 555 osi->os_flags = osi->os_phys->os_flags; 556 } 557 558 dsl_dataset_dirty(ds, tx); 559 560 return (osi); 561 } 562 563 struct oscarg { 564 void (*userfunc)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx); 565 void *userarg; 566 dsl_dataset_t *clone_parent; 567 const char *lastname; 568 dmu_objset_type_t type; 569 uint64_t flags; 570 }; 571 572 /*ARGSUSED*/ 573 static int 574 dmu_objset_create_check(void *arg1, void *arg2, dmu_tx_t *tx) 575 { 576 dsl_dir_t *dd = arg1; 577 struct oscarg *oa = arg2; 578 objset_t *mos = dd->dd_pool->dp_meta_objset; 579 int err; 580 uint64_t ddobj; 581 582 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 583 oa->lastname, sizeof (uint64_t), 1, &ddobj); 584 if (err != ENOENT) 585 return (err ? err : EEXIST); 586 587 if (oa->clone_parent != NULL) { 588 /* 589 * You can't clone across pools. 590 */ 591 if (oa->clone_parent->ds_dir->dd_pool != dd->dd_pool) 592 return (EXDEV); 593 594 /* 595 * You can only clone snapshots, not the head datasets. 596 */ 597 if (oa->clone_parent->ds_phys->ds_num_children == 0) 598 return (EINVAL); 599 } 600 601 return (0); 602 } 603 604 static void 605 dmu_objset_create_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 606 { 607 dsl_dir_t *dd = arg1; 608 struct oscarg *oa = arg2; 609 dsl_dataset_t *ds; 610 blkptr_t *bp; 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_parent, oa->flags, cr, tx); 617 618 VERIFY(0 == dsl_dataset_hold_obj(dd->dd_pool, dsobj, FTAG, &ds)); 619 bp = dsl_dataset_get_blkptr(ds); 620 if (BP_IS_HOLE(bp)) { 621 objset_impl_t *osi; 622 623 /* This is an empty dmu_objset; not a clone. */ 624 osi = dmu_objset_create_impl(dsl_dataset_get_spa(ds), 625 ds, bp, oa->type, tx); 626 627 if (oa->userfunc) 628 oa->userfunc(&osi->os, oa->userarg, cr, tx); 629 } 630 631 spa_history_internal_log(LOG_DS_CREATE, dd->dd_pool->dp_spa, 632 tx, cr, "dataset = %llu", dsobj); 633 634 dsl_dataset_rele(ds, FTAG); 635 } 636 637 int 638 dmu_objset_create(const char *name, dmu_objset_type_t type, 639 objset_t *clone_parent, uint64_t flags, 640 void (*func)(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx), void *arg) 641 { 642 dsl_dir_t *pdd; 643 const char *tail; 644 int err = 0; 645 struct oscarg oa = { 0 }; 646 647 ASSERT(strchr(name, '@') == NULL); 648 err = dsl_dir_open(name, FTAG, &pdd, &tail); 649 if (err) 650 return (err); 651 if (tail == NULL) { 652 dsl_dir_close(pdd, FTAG); 653 return (EEXIST); 654 } 655 656 dprintf("name=%s\n", name); 657 658 oa.userfunc = func; 659 oa.userarg = arg; 660 oa.lastname = tail; 661 oa.type = type; 662 oa.flags = flags; 663 664 if (clone_parent != NULL) { 665 /* 666 * You can't clone to a different type. 667 */ 668 if (clone_parent->os->os_phys->os_type != type) { 669 dsl_dir_close(pdd, FTAG); 670 return (EINVAL); 671 } 672 oa.clone_parent = clone_parent->os->os_dsl_dataset; 673 } 674 err = dsl_sync_task_do(pdd->dd_pool, dmu_objset_create_check, 675 dmu_objset_create_sync, pdd, &oa, 5); 676 dsl_dir_close(pdd, FTAG); 677 return (err); 678 } 679 680 int 681 dmu_objset_destroy(const char *name) 682 { 683 objset_t *os; 684 int error; 685 686 /* 687 * If it looks like we'll be able to destroy it, and there's 688 * an unplayed replay log sitting around, destroy the log. 689 * It would be nicer to do this in dsl_dataset_destroy_sync(), 690 * but the replay log objset is modified in open context. 691 */ 692 error = dmu_objset_open(name, DMU_OST_ANY, 693 DS_MODE_OWNER|DS_MODE_READONLY|DS_MODE_INCONSISTENT, &os); 694 if (error == 0) { 695 dsl_dataset_t *ds = os->os->os_dsl_dataset; 696 zil_destroy(dmu_objset_zil(os), B_FALSE); 697 698 error = dsl_dataset_destroy(ds, os); 699 /* 700 * dsl_dataset_destroy() closes the ds. 701 */ 702 kmem_free(os, sizeof (objset_t)); 703 } 704 705 return (error); 706 } 707 708 /* 709 * This will close the objset. 710 */ 711 int 712 dmu_objset_rollback(objset_t *os) 713 { 714 int err; 715 dsl_dataset_t *ds; 716 717 ds = os->os->os_dsl_dataset; 718 719 if (!dsl_dataset_tryown(ds, TRUE, os)) { 720 dmu_objset_close(os); 721 return (EBUSY); 722 } 723 724 err = dsl_dataset_rollback(ds, os->os->os_phys->os_type); 725 726 /* 727 * NB: we close the objset manually because the rollback 728 * actually implicitly called dmu_objset_evict(), thus freeing 729 * the objset_impl_t. 730 */ 731 dsl_dataset_disown(ds, os); 732 kmem_free(os, sizeof (objset_t)); 733 return (err); 734 } 735 736 struct snaparg { 737 dsl_sync_task_group_t *dstg; 738 char *snapname; 739 char failed[MAXPATHLEN]; 740 boolean_t checkperms; 741 nvlist_t *props; 742 }; 743 744 static int 745 snapshot_check(void *arg1, void *arg2, dmu_tx_t *tx) 746 { 747 objset_t *os = arg1; 748 struct snaparg *sn = arg2; 749 750 /* The props have already been checked by zfs_check_userprops(). */ 751 752 return (dsl_dataset_snapshot_check(os->os->os_dsl_dataset, 753 sn->snapname, tx)); 754 } 755 756 static void 757 snapshot_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 758 { 759 objset_t *os = arg1; 760 dsl_dataset_t *ds = os->os->os_dsl_dataset; 761 struct snaparg *sn = arg2; 762 763 dsl_dataset_snapshot_sync(ds, sn->snapname, cr, tx); 764 765 if (sn->props) 766 dsl_props_set_sync(ds->ds_prev, sn->props, cr, tx); 767 } 768 769 static int 770 dmu_objset_snapshot_one(char *name, void *arg) 771 { 772 struct snaparg *sn = arg; 773 objset_t *os; 774 int err; 775 776 (void) strcpy(sn->failed, name); 777 778 /* 779 * Check permissions only when requested. This only applies when 780 * doing a recursive snapshot. The permission checks for the starting 781 * dataset have already been performed in zfs_secpolicy_snapshot() 782 */ 783 if (sn->checkperms == B_TRUE && 784 (err = zfs_secpolicy_snapshot_perms(name, CRED()))) 785 return (err); 786 787 err = dmu_objset_open(name, DMU_OST_ANY, DS_MODE_USER, &os); 788 if (err != 0) 789 return (err); 790 791 /* If the objset is in an inconsistent state, return busy */ 792 if (os->os->os_dsl_dataset->ds_phys->ds_flags & DS_FLAG_INCONSISTENT) { 793 dmu_objset_close(os); 794 return (EBUSY); 795 } 796 797 /* 798 * NB: we need to wait for all in-flight changes to get to disk, 799 * so that we snapshot those changes. zil_suspend does this as 800 * a side effect. 801 */ 802 err = zil_suspend(dmu_objset_zil(os)); 803 if (err == 0) { 804 dsl_sync_task_create(sn->dstg, snapshot_check, 805 snapshot_sync, os, sn, 3); 806 } else { 807 dmu_objset_close(os); 808 } 809 810 return (err); 811 } 812 813 int 814 dmu_objset_snapshot(char *fsname, char *snapname, 815 nvlist_t *props, boolean_t recursive) 816 { 817 dsl_sync_task_t *dst; 818 struct snaparg sn; 819 spa_t *spa; 820 int err; 821 822 (void) strcpy(sn.failed, fsname); 823 824 err = spa_open(fsname, &spa, FTAG); 825 if (err) 826 return (err); 827 828 sn.dstg = dsl_sync_task_group_create(spa_get_dsl(spa)); 829 sn.snapname = snapname; 830 sn.props = props; 831 832 if (recursive) { 833 sn.checkperms = B_TRUE; 834 err = dmu_objset_find(fsname, 835 dmu_objset_snapshot_one, &sn, DS_FIND_CHILDREN); 836 } else { 837 sn.checkperms = B_FALSE; 838 err = dmu_objset_snapshot_one(fsname, &sn); 839 } 840 841 if (err == 0) 842 err = dsl_sync_task_group_wait(sn.dstg); 843 844 for (dst = list_head(&sn.dstg->dstg_tasks); dst; 845 dst = list_next(&sn.dstg->dstg_tasks, dst)) { 846 objset_t *os = dst->dst_arg1; 847 dsl_dataset_t *ds = os->os->os_dsl_dataset; 848 if (dst->dst_err) 849 dsl_dataset_name(ds, sn.failed); 850 zil_resume(dmu_objset_zil(os)); 851 dmu_objset_close(os); 852 } 853 854 if (err) 855 (void) strcpy(fsname, sn.failed); 856 dsl_sync_task_group_destroy(sn.dstg); 857 spa_close(spa, FTAG); 858 return (err); 859 } 860 861 static void 862 dmu_objset_sync_dnodes(list_t *list, list_t *newlist, dmu_tx_t *tx) 863 { 864 dnode_t *dn; 865 866 while (dn = list_head(list)) { 867 ASSERT(dn->dn_object != DMU_META_DNODE_OBJECT); 868 ASSERT(dn->dn_dbuf->db_data_pending); 869 /* 870 * Initialize dn_zio outside dnode_sync() because the 871 * meta-dnode needs to set it ouside dnode_sync(). 872 */ 873 dn->dn_zio = dn->dn_dbuf->db_data_pending->dr_zio; 874 ASSERT(dn->dn_zio); 875 876 ASSERT3U(dn->dn_nlevels, <=, DN_MAX_LEVELS); 877 list_remove(list, dn); 878 879 if (newlist) { 880 (void) dnode_add_ref(dn, newlist); 881 list_insert_tail(newlist, dn); 882 } 883 884 dnode_sync(dn, tx); 885 } 886 } 887 888 /* ARGSUSED */ 889 static void 890 ready(zio_t *zio, arc_buf_t *abuf, void *arg) 891 { 892 blkptr_t *bp = zio->io_bp; 893 blkptr_t *bp_orig = &zio->io_bp_orig; 894 objset_impl_t *os = arg; 895 dnode_phys_t *dnp = &os->os_phys->os_meta_dnode; 896 897 ASSERT(bp == os->os_rootbp); 898 ASSERT(BP_GET_TYPE(bp) == DMU_OT_OBJSET); 899 ASSERT(BP_GET_LEVEL(bp) == 0); 900 901 /* 902 * Update rootbp fill count: it should be the number of objects 903 * allocated in the object set (not counting the "special" 904 * objects that are stored in the objset_phys_t -- the meta 905 * dnode and user/group accounting objects). 906 */ 907 bp->blk_fill = 0; 908 for (int i = 0; i < dnp->dn_nblkptr; i++) 909 bp->blk_fill += dnp->dn_blkptr[i].blk_fill; 910 911 if (zio->io_flags & ZIO_FLAG_IO_REWRITE) { 912 ASSERT(DVA_EQUAL(BP_IDENTITY(bp), BP_IDENTITY(bp_orig))); 913 } else { 914 if (zio->io_bp_orig.blk_birth == os->os_synctx->tx_txg) 915 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 916 &zio->io_bp_orig, zio, os->os_synctx); 917 dsl_dataset_block_born(os->os_dsl_dataset, bp, os->os_synctx); 918 } 919 } 920 921 /* called from dsl */ 922 void 923 dmu_objset_sync(objset_impl_t *os, zio_t *pio, dmu_tx_t *tx) 924 { 925 int txgoff; 926 zbookmark_t zb; 927 writeprops_t wp = { 0 }; 928 zio_t *zio; 929 list_t *list; 930 list_t *newlist = NULL; 931 dbuf_dirty_record_t *dr; 932 933 dprintf_ds(os->os_dsl_dataset, "txg=%llu\n", tx->tx_txg); 934 935 ASSERT(dmu_tx_is_syncing(tx)); 936 /* XXX the write_done callback should really give us the tx... */ 937 os->os_synctx = tx; 938 939 if (os->os_dsl_dataset == NULL) { 940 /* 941 * This is the MOS. If we have upgraded, 942 * spa_max_replication() could change, so reset 943 * os_copies here. 944 */ 945 os->os_copies = spa_max_replication(os->os_spa); 946 } 947 948 /* 949 * Create the root block IO 950 */ 951 zb.zb_objset = os->os_dsl_dataset ? os->os_dsl_dataset->ds_object : 0; 952 zb.zb_object = 0; 953 zb.zb_level = -1; /* for block ordering; it's level 0 on disk */ 954 zb.zb_blkid = 0; 955 956 wp.wp_type = DMU_OT_OBJSET; 957 wp.wp_level = 0; /* on-disk BP level; see above */ 958 wp.wp_copies = os->os_copies; 959 wp.wp_oschecksum = os->os_checksum; 960 wp.wp_oscompress = os->os_compress; 961 962 if (BP_IS_OLDER(os->os_rootbp, tx->tx_txg)) { 963 (void) dsl_dataset_block_kill(os->os_dsl_dataset, 964 os->os_rootbp, pio, tx); 965 } 966 967 arc_release(os->os_phys_buf, &os->os_phys_buf); 968 969 zio = arc_write(pio, os->os_spa, &wp, DMU_OS_IS_L2CACHEABLE(os), 970 tx->tx_txg, os->os_rootbp, os->os_phys_buf, ready, NULL, os, 971 ZIO_PRIORITY_ASYNC_WRITE, ZIO_FLAG_MUSTSUCCEED, &zb); 972 973 /* 974 * Sync special dnodes - the parent IO for the sync is the root block 975 */ 976 os->os_meta_dnode->dn_zio = zio; 977 dnode_sync(os->os_meta_dnode, tx); 978 979 os->os_phys->os_flags = os->os_flags; 980 981 if (os->os_userused_dnode && 982 os->os_userused_dnode->dn_type != DMU_OT_NONE) { 983 os->os_userused_dnode->dn_zio = zio; 984 dnode_sync(os->os_userused_dnode, tx); 985 os->os_groupused_dnode->dn_zio = zio; 986 dnode_sync(os->os_groupused_dnode, tx); 987 } 988 989 txgoff = tx->tx_txg & TXG_MASK; 990 991 if (dmu_objset_userused_enabled(os)) { 992 newlist = &os->os_synced_dnodes; 993 /* 994 * We must create the list here because it uses the 995 * dn_dirty_link[] of this txg. 996 */ 997 list_create(newlist, sizeof (dnode_t), 998 offsetof(dnode_t, dn_dirty_link[txgoff])); 999 } 1000 1001 dmu_objset_sync_dnodes(&os->os_free_dnodes[txgoff], newlist, tx); 1002 dmu_objset_sync_dnodes(&os->os_dirty_dnodes[txgoff], newlist, tx); 1003 1004 list = &os->os_meta_dnode->dn_dirty_records[txgoff]; 1005 while (dr = list_head(list)) { 1006 ASSERT(dr->dr_dbuf->db_level == 0); 1007 list_remove(list, dr); 1008 if (dr->dr_zio) 1009 zio_nowait(dr->dr_zio); 1010 } 1011 /* 1012 * Free intent log blocks up to this tx. 1013 */ 1014 zil_sync(os->os_zil, tx); 1015 os->os_phys->os_zil_header = os->os_zil_header; 1016 zio_nowait(zio); 1017 } 1018 1019 static objset_used_cb_t *used_cbs[DMU_OST_NUMTYPES]; 1020 1021 void 1022 dmu_objset_register_type(dmu_objset_type_t ost, objset_used_cb_t *cb) 1023 { 1024 used_cbs[ost] = cb; 1025 } 1026 1027 boolean_t 1028 dmu_objset_userused_enabled(objset_impl_t *os) 1029 { 1030 return (spa_version(os->os_spa) >= SPA_VERSION_USERSPACE && 1031 used_cbs[os->os_phys->os_type] && 1032 os->os_userused_dnode); 1033 } 1034 1035 void 1036 dmu_objset_do_userquota_callbacks(objset_impl_t *os, dmu_tx_t *tx) 1037 { 1038 dnode_t *dn; 1039 list_t *list = &os->os_synced_dnodes; 1040 static const char zerobuf[DN_MAX_BONUSLEN] = {0}; 1041 1042 ASSERT(list_head(list) == NULL || dmu_objset_userused_enabled(os)); 1043 1044 while (dn = list_head(list)) { 1045 dmu_object_type_t bonustype; 1046 1047 ASSERT(!DMU_OBJECT_IS_SPECIAL(dn->dn_object)); 1048 ASSERT(dn->dn_oldphys); 1049 ASSERT(dn->dn_phys->dn_type == DMU_OT_NONE || 1050 dn->dn_phys->dn_flags & 1051 DNODE_FLAG_USERUSED_ACCOUNTED); 1052 1053 /* Allocate the user/groupused objects if necessary. */ 1054 if (os->os_userused_dnode->dn_type == DMU_OT_NONE) { 1055 VERIFY(0 == zap_create_claim(&os->os, 1056 DMU_USERUSED_OBJECT, 1057 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1058 VERIFY(0 == zap_create_claim(&os->os, 1059 DMU_GROUPUSED_OBJECT, 1060 DMU_OT_USERGROUP_USED, DMU_OT_NONE, 0, tx)); 1061 } 1062 1063 /* 1064 * If the object was not previously 1065 * accounted, pretend that it was free. 1066 */ 1067 if (!(dn->dn_oldphys->dn_flags & 1068 DNODE_FLAG_USERUSED_ACCOUNTED)) { 1069 bzero(dn->dn_oldphys, sizeof (dnode_phys_t)); 1070 } 1071 1072 /* 1073 * If the object was freed, use the previous bonustype. 1074 */ 1075 bonustype = dn->dn_phys->dn_bonustype ? 1076 dn->dn_phys->dn_bonustype : dn->dn_oldphys->dn_bonustype; 1077 ASSERT(dn->dn_phys->dn_type != 0 || 1078 (bcmp(DN_BONUS(dn->dn_phys), zerobuf, 1079 DN_MAX_BONUSLEN) == 0 && 1080 DN_USED_BYTES(dn->dn_phys) == 0)); 1081 ASSERT(dn->dn_oldphys->dn_type != 0 || 1082 (bcmp(DN_BONUS(dn->dn_oldphys), zerobuf, 1083 DN_MAX_BONUSLEN) == 0 && 1084 DN_USED_BYTES(dn->dn_oldphys) == 0)); 1085 used_cbs[os->os_phys->os_type](&os->os, bonustype, 1086 DN_BONUS(dn->dn_oldphys), DN_BONUS(dn->dn_phys), 1087 DN_USED_BYTES(dn->dn_oldphys), 1088 DN_USED_BYTES(dn->dn_phys), tx); 1089 1090 /* 1091 * The mutex is needed here for interlock with dnode_allocate. 1092 */ 1093 mutex_enter(&dn->dn_mtx); 1094 zio_buf_free(dn->dn_oldphys, sizeof (dnode_phys_t)); 1095 dn->dn_oldphys = NULL; 1096 mutex_exit(&dn->dn_mtx); 1097 1098 list_remove(list, dn); 1099 dnode_rele(dn, list); 1100 } 1101 } 1102 1103 boolean_t 1104 dmu_objset_userspace_present(objset_t *os) 1105 { 1106 return (os->os->os_phys->os_flags & 1107 OBJSET_FLAG_USERACCOUNTING_COMPLETE); 1108 } 1109 1110 int 1111 dmu_objset_userspace_upgrade(objset_t *os) 1112 { 1113 uint64_t obj; 1114 int err = 0; 1115 1116 if (dmu_objset_userspace_present(os)) 1117 return (0); 1118 if (!dmu_objset_userused_enabled(os->os)) 1119 return (ENOTSUP); 1120 if (dmu_objset_is_snapshot(os)) 1121 return (EINVAL); 1122 1123 /* 1124 * We simply need to mark every object dirty, so that it will be 1125 * synced out and now accounted. If this is called 1126 * concurrently, or if we already did some work before crashing, 1127 * that's fine, since we track each object's accounted state 1128 * independently. 1129 */ 1130 1131 for (obj = 0; err == 0; err = dmu_object_next(os, &obj, FALSE, 0)) { 1132 dmu_tx_t *tx = dmu_tx_create(os); 1133 dmu_buf_t *db; 1134 int objerr; 1135 1136 if (issig(JUSTLOOKING) && issig(FORREAL)) 1137 return (EINTR); 1138 1139 objerr = dmu_bonus_hold(os, obj, FTAG, &db); 1140 if (objerr) 1141 continue; 1142 dmu_tx_hold_bonus(tx, obj); 1143 objerr = dmu_tx_assign(tx, TXG_WAIT); 1144 if (objerr) { 1145 dmu_tx_abort(tx); 1146 continue; 1147 } 1148 dmu_buf_will_dirty(db, tx); 1149 dmu_buf_rele(db, FTAG); 1150 dmu_tx_commit(tx); 1151 } 1152 1153 os->os->os_flags |= OBJSET_FLAG_USERACCOUNTING_COMPLETE; 1154 txg_wait_synced(dmu_objset_pool(os), 0); 1155 return (0); 1156 } 1157 1158 void 1159 dmu_objset_space(objset_t *os, uint64_t *refdbytesp, uint64_t *availbytesp, 1160 uint64_t *usedobjsp, uint64_t *availobjsp) 1161 { 1162 dsl_dataset_space(os->os->os_dsl_dataset, refdbytesp, availbytesp, 1163 usedobjsp, availobjsp); 1164 } 1165 1166 uint64_t 1167 dmu_objset_fsid_guid(objset_t *os) 1168 { 1169 return (dsl_dataset_fsid_guid(os->os->os_dsl_dataset)); 1170 } 1171 1172 void 1173 dmu_objset_fast_stat(objset_t *os, dmu_objset_stats_t *stat) 1174 { 1175 stat->dds_type = os->os->os_phys->os_type; 1176 if (os->os->os_dsl_dataset) 1177 dsl_dataset_fast_stat(os->os->os_dsl_dataset, stat); 1178 } 1179 1180 void 1181 dmu_objset_stats(objset_t *os, nvlist_t *nv) 1182 { 1183 ASSERT(os->os->os_dsl_dataset || 1184 os->os->os_phys->os_type == DMU_OST_META); 1185 1186 if (os->os->os_dsl_dataset != NULL) 1187 dsl_dataset_stats(os->os->os_dsl_dataset, nv); 1188 1189 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_TYPE, 1190 os->os->os_phys->os_type); 1191 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_USERACCOUNTING, 1192 dmu_objset_userspace_present(os)); 1193 } 1194 1195 int 1196 dmu_objset_is_snapshot(objset_t *os) 1197 { 1198 if (os->os->os_dsl_dataset != NULL) 1199 return (dsl_dataset_is_snapshot(os->os->os_dsl_dataset)); 1200 else 1201 return (B_FALSE); 1202 } 1203 1204 int 1205 dmu_snapshot_realname(objset_t *os, char *name, char *real, int maxlen, 1206 boolean_t *conflict) 1207 { 1208 dsl_dataset_t *ds = os->os->os_dsl_dataset; 1209 uint64_t ignored; 1210 1211 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1212 return (ENOENT); 1213 1214 return (zap_lookup_norm(ds->ds_dir->dd_pool->dp_meta_objset, 1215 ds->ds_phys->ds_snapnames_zapobj, name, 8, 1, &ignored, MT_FIRST, 1216 real, maxlen, conflict)); 1217 } 1218 1219 int 1220 dmu_snapshot_list_next(objset_t *os, int namelen, char *name, 1221 uint64_t *idp, uint64_t *offp, boolean_t *case_conflict) 1222 { 1223 dsl_dataset_t *ds = os->os->os_dsl_dataset; 1224 zap_cursor_t cursor; 1225 zap_attribute_t attr; 1226 1227 if (ds->ds_phys->ds_snapnames_zapobj == 0) 1228 return (ENOENT); 1229 1230 zap_cursor_init_serialized(&cursor, 1231 ds->ds_dir->dd_pool->dp_meta_objset, 1232 ds->ds_phys->ds_snapnames_zapobj, *offp); 1233 1234 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1235 zap_cursor_fini(&cursor); 1236 return (ENOENT); 1237 } 1238 1239 if (strlen(attr.za_name) + 1 > namelen) { 1240 zap_cursor_fini(&cursor); 1241 return (ENAMETOOLONG); 1242 } 1243 1244 (void) strcpy(name, attr.za_name); 1245 if (idp) 1246 *idp = attr.za_first_integer; 1247 if (case_conflict) 1248 *case_conflict = attr.za_normalization_conflict; 1249 zap_cursor_advance(&cursor); 1250 *offp = zap_cursor_serialize(&cursor); 1251 zap_cursor_fini(&cursor); 1252 1253 return (0); 1254 } 1255 1256 int 1257 dmu_dir_list_next(objset_t *os, int namelen, char *name, 1258 uint64_t *idp, uint64_t *offp) 1259 { 1260 dsl_dir_t *dd = os->os->os_dsl_dataset->ds_dir; 1261 zap_cursor_t cursor; 1262 zap_attribute_t attr; 1263 1264 /* there is no next dir on a snapshot! */ 1265 if (os->os->os_dsl_dataset->ds_object != 1266 dd->dd_phys->dd_head_dataset_obj) 1267 return (ENOENT); 1268 1269 zap_cursor_init_serialized(&cursor, 1270 dd->dd_pool->dp_meta_objset, 1271 dd->dd_phys->dd_child_dir_zapobj, *offp); 1272 1273 if (zap_cursor_retrieve(&cursor, &attr) != 0) { 1274 zap_cursor_fini(&cursor); 1275 return (ENOENT); 1276 } 1277 1278 if (strlen(attr.za_name) + 1 > namelen) { 1279 zap_cursor_fini(&cursor); 1280 return (ENAMETOOLONG); 1281 } 1282 1283 (void) strcpy(name, attr.za_name); 1284 if (idp) 1285 *idp = attr.za_first_integer; 1286 zap_cursor_advance(&cursor); 1287 *offp = zap_cursor_serialize(&cursor); 1288 zap_cursor_fini(&cursor); 1289 1290 return (0); 1291 } 1292 1293 struct findarg { 1294 int (*func)(char *, void *); 1295 void *arg; 1296 }; 1297 1298 /* ARGSUSED */ 1299 static int 1300 findfunc(spa_t *spa, uint64_t dsobj, const char *dsname, void *arg) 1301 { 1302 struct findarg *fa = arg; 1303 return (fa->func((char *)dsname, fa->arg)); 1304 } 1305 1306 /* 1307 * Find all objsets under name, and for each, call 'func(child_name, arg)'. 1308 * Perhaps change all callers to use dmu_objset_find_spa()? 1309 */ 1310 int 1311 dmu_objset_find(char *name, int func(char *, void *), void *arg, int flags) 1312 { 1313 struct findarg fa; 1314 fa.func = func; 1315 fa.arg = arg; 1316 return (dmu_objset_find_spa(NULL, name, findfunc, &fa, flags)); 1317 } 1318 1319 /* 1320 * Find all objsets under name, call func on each 1321 */ 1322 int 1323 dmu_objset_find_spa(spa_t *spa, const char *name, 1324 int func(spa_t *, uint64_t, const char *, void *), void *arg, int flags) 1325 { 1326 dsl_dir_t *dd; 1327 dsl_pool_t *dp; 1328 dsl_dataset_t *ds; 1329 zap_cursor_t zc; 1330 zap_attribute_t *attr; 1331 char *child; 1332 uint64_t thisobj; 1333 int err; 1334 1335 if (name == NULL) 1336 name = spa_name(spa); 1337 err = dsl_dir_open_spa(spa, name, FTAG, &dd, NULL); 1338 if (err) 1339 return (err); 1340 1341 /* Don't visit hidden ($MOS & $ORIGIN) objsets. */ 1342 if (dd->dd_myname[0] == '$') { 1343 dsl_dir_close(dd, FTAG); 1344 return (0); 1345 } 1346 1347 thisobj = dd->dd_phys->dd_head_dataset_obj; 1348 attr = kmem_alloc(sizeof (zap_attribute_t), KM_SLEEP); 1349 dp = dd->dd_pool; 1350 1351 /* 1352 * Iterate over all children. 1353 */ 1354 if (flags & DS_FIND_CHILDREN) { 1355 for (zap_cursor_init(&zc, dp->dp_meta_objset, 1356 dd->dd_phys->dd_child_dir_zapobj); 1357 zap_cursor_retrieve(&zc, attr) == 0; 1358 (void) zap_cursor_advance(&zc)) { 1359 ASSERT(attr->za_integer_length == sizeof (uint64_t)); 1360 ASSERT(attr->za_num_integers == 1); 1361 1362 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1363 (void) strcpy(child, name); 1364 (void) strcat(child, "/"); 1365 (void) strcat(child, attr->za_name); 1366 err = dmu_objset_find_spa(spa, child, func, arg, flags); 1367 kmem_free(child, MAXPATHLEN); 1368 if (err) 1369 break; 1370 } 1371 zap_cursor_fini(&zc); 1372 1373 if (err) { 1374 dsl_dir_close(dd, FTAG); 1375 kmem_free(attr, sizeof (zap_attribute_t)); 1376 return (err); 1377 } 1378 } 1379 1380 /* 1381 * Iterate over all snapshots. 1382 */ 1383 if (flags & DS_FIND_SNAPSHOTS) { 1384 if (!dsl_pool_sync_context(dp)) 1385 rw_enter(&dp->dp_config_rwlock, RW_READER); 1386 err = dsl_dataset_hold_obj(dp, thisobj, FTAG, &ds); 1387 if (!dsl_pool_sync_context(dp)) 1388 rw_exit(&dp->dp_config_rwlock); 1389 1390 if (err == 0) { 1391 uint64_t snapobj = ds->ds_phys->ds_snapnames_zapobj; 1392 dsl_dataset_rele(ds, FTAG); 1393 1394 for (zap_cursor_init(&zc, dp->dp_meta_objset, snapobj); 1395 zap_cursor_retrieve(&zc, attr) == 0; 1396 (void) zap_cursor_advance(&zc)) { 1397 ASSERT(attr->za_integer_length == 1398 sizeof (uint64_t)); 1399 ASSERT(attr->za_num_integers == 1); 1400 1401 child = kmem_alloc(MAXPATHLEN, KM_SLEEP); 1402 (void) strcpy(child, name); 1403 (void) strcat(child, "@"); 1404 (void) strcat(child, attr->za_name); 1405 err = func(spa, attr->za_first_integer, 1406 child, arg); 1407 kmem_free(child, MAXPATHLEN); 1408 if (err) 1409 break; 1410 } 1411 zap_cursor_fini(&zc); 1412 } 1413 } 1414 1415 dsl_dir_close(dd, FTAG); 1416 kmem_free(attr, sizeof (zap_attribute_t)); 1417 1418 if (err) 1419 return (err); 1420 1421 /* 1422 * Apply to self if appropriate. 1423 */ 1424 err = func(spa, thisobj, name, arg); 1425 return (err); 1426 } 1427 1428 /* ARGSUSED */ 1429 int 1430 dmu_objset_prefetch(char *name, void *arg) 1431 { 1432 dsl_dataset_t *ds; 1433 1434 if (dsl_dataset_hold(name, FTAG, &ds)) 1435 return (0); 1436 1437 if (!BP_IS_HOLE(&ds->ds_phys->ds_bp)) { 1438 mutex_enter(&ds->ds_opening_lock); 1439 if (!dsl_dataset_get_user_ptr(ds)) { 1440 uint32_t aflags = ARC_NOWAIT | ARC_PREFETCH; 1441 zbookmark_t zb; 1442 1443 zb.zb_objset = ds->ds_object; 1444 zb.zb_object = 0; 1445 zb.zb_level = -1; 1446 zb.zb_blkid = 0; 1447 1448 (void) arc_read_nolock(NULL, dsl_dataset_get_spa(ds), 1449 &ds->ds_phys->ds_bp, NULL, NULL, 1450 ZIO_PRIORITY_ASYNC_READ, 1451 ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE, 1452 &aflags, &zb); 1453 } 1454 mutex_exit(&ds->ds_opening_lock); 1455 } 1456 1457 dsl_dataset_rele(ds, FTAG); 1458 return (0); 1459 } 1460 1461 void 1462 dmu_objset_set_user(objset_t *os, void *user_ptr) 1463 { 1464 ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock)); 1465 os->os->os_user_ptr = user_ptr; 1466 } 1467 1468 void * 1469 dmu_objset_get_user(objset_t *os) 1470 { 1471 ASSERT(MUTEX_HELD(&os->os->os_user_ptr_lock)); 1472 return (os->os->os_user_ptr); 1473 } 1474