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 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/dmu.h> 29 #include <sys/dmu_impl.h> 30 #include <sys/dmu_tx.h> 31 #include <sys/dbuf.h> 32 #include <sys/dnode.h> 33 #include <sys/zfs_context.h> 34 #include <sys/dmu_objset.h> 35 #include <sys/dmu_traverse.h> 36 #include <sys/dsl_dataset.h> 37 #include <sys/dsl_dir.h> 38 #include <sys/dsl_pool.h> 39 #include <sys/dsl_synctask.h> 40 #include <sys/zfs_ioctl.h> 41 #include <sys/zap.h> 42 #include <sys/zio_checksum.h> 43 44 static char *dmu_recv_tag = "dmu_recv_tag"; 45 46 struct backuparg { 47 dmu_replay_record_t *drr; 48 vnode_t *vp; 49 offset_t *off; 50 objset_t *os; 51 zio_cksum_t zc; 52 int err; 53 }; 54 55 static int 56 dump_bytes(struct backuparg *ba, void *buf, int len) 57 { 58 ssize_t resid; /* have to get resid to get detailed errno */ 59 ASSERT3U(len % 8, ==, 0); 60 61 fletcher_4_incremental_native(buf, len, &ba->zc); 62 ba->err = vn_rdwr(UIO_WRITE, ba->vp, 63 (caddr_t)buf, len, 64 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid); 65 *ba->off += len; 66 return (ba->err); 67 } 68 69 static int 70 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset, 71 uint64_t length) 72 { 73 /* write a FREE record */ 74 bzero(ba->drr, sizeof (dmu_replay_record_t)); 75 ba->drr->drr_type = DRR_FREE; 76 ba->drr->drr_u.drr_free.drr_object = object; 77 ba->drr->drr_u.drr_free.drr_offset = offset; 78 ba->drr->drr_u.drr_free.drr_length = length; 79 80 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 81 return (EINTR); 82 return (0); 83 } 84 85 static int 86 dump_data(struct backuparg *ba, dmu_object_type_t type, 87 uint64_t object, uint64_t offset, int blksz, void *data) 88 { 89 /* write a DATA record */ 90 bzero(ba->drr, sizeof (dmu_replay_record_t)); 91 ba->drr->drr_type = DRR_WRITE; 92 ba->drr->drr_u.drr_write.drr_object = object; 93 ba->drr->drr_u.drr_write.drr_type = type; 94 ba->drr->drr_u.drr_write.drr_offset = offset; 95 ba->drr->drr_u.drr_write.drr_length = blksz; 96 97 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 98 return (EINTR); 99 if (dump_bytes(ba, data, blksz)) 100 return (EINTR); 101 return (0); 102 } 103 104 static int 105 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs) 106 { 107 /* write a FREEOBJECTS record */ 108 bzero(ba->drr, sizeof (dmu_replay_record_t)); 109 ba->drr->drr_type = DRR_FREEOBJECTS; 110 ba->drr->drr_u.drr_freeobjects.drr_firstobj = firstobj; 111 ba->drr->drr_u.drr_freeobjects.drr_numobjs = numobjs; 112 113 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 114 return (EINTR); 115 return (0); 116 } 117 118 static int 119 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp) 120 { 121 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) 122 return (dump_freeobjects(ba, object, 1)); 123 124 /* write an OBJECT record */ 125 bzero(ba->drr, sizeof (dmu_replay_record_t)); 126 ba->drr->drr_type = DRR_OBJECT; 127 ba->drr->drr_u.drr_object.drr_object = object; 128 ba->drr->drr_u.drr_object.drr_type = dnp->dn_type; 129 ba->drr->drr_u.drr_object.drr_bonustype = dnp->dn_bonustype; 130 ba->drr->drr_u.drr_object.drr_blksz = 131 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 132 ba->drr->drr_u.drr_object.drr_bonuslen = dnp->dn_bonuslen; 133 ba->drr->drr_u.drr_object.drr_checksum = dnp->dn_checksum; 134 ba->drr->drr_u.drr_object.drr_compress = dnp->dn_compress; 135 136 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 137 return (EINTR); 138 139 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8))) 140 return (EINTR); 141 142 /* free anything past the end of the file */ 143 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) * 144 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL)) 145 return (EINTR); 146 if (ba->err) 147 return (EINTR); 148 return (0); 149 } 150 151 #define BP_SPAN(dnp, level) \ 152 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \ 153 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) 154 155 static int 156 backup_cb(traverse_blk_cache_t *bc, spa_t *spa, void *arg) 157 { 158 struct backuparg *ba = arg; 159 uint64_t object = bc->bc_bookmark.zb_object; 160 int level = bc->bc_bookmark.zb_level; 161 uint64_t blkid = bc->bc_bookmark.zb_blkid; 162 blkptr_t *bp = bc->bc_blkptr.blk_birth ? &bc->bc_blkptr : NULL; 163 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; 164 void *data = bc->bc_data; 165 int err = 0; 166 167 if (issig(JUSTLOOKING) && issig(FORREAL)) 168 return (EINTR); 169 170 ASSERT(data || bp == NULL); 171 172 if (bp == NULL && object == 0) { 173 uint64_t span = BP_SPAN(bc->bc_dnode, level); 174 uint64_t dnobj = (blkid * span) >> DNODE_SHIFT; 175 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT); 176 } else if (bp == NULL) { 177 uint64_t span = BP_SPAN(bc->bc_dnode, level); 178 err = dump_free(ba, object, blkid * span, span); 179 } else if (data && level == 0 && type == DMU_OT_DNODE) { 180 dnode_phys_t *blk = data; 181 int i; 182 int blksz = BP_GET_LSIZE(bp); 183 184 for (i = 0; i < blksz >> DNODE_SHIFT; i++) { 185 uint64_t dnobj = 186 (blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i; 187 err = dump_dnode(ba, dnobj, blk+i); 188 if (err) 189 break; 190 } 191 } else if (level == 0 && 192 type != DMU_OT_DNODE && type != DMU_OT_OBJSET) { 193 int blksz = BP_GET_LSIZE(bp); 194 if (data == NULL) { 195 uint32_t aflags = ARC_WAIT; 196 arc_buf_t *abuf; 197 zbookmark_t zb; 198 199 zb.zb_objset = ba->os->os->os_dsl_dataset->ds_object; 200 zb.zb_object = object; 201 zb.zb_level = level; 202 zb.zb_blkid = blkid; 203 (void) arc_read(NULL, spa, bp, 204 dmu_ot[type].ot_byteswap, arc_getbuf_func, &abuf, 205 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_MUSTSUCCEED, 206 &aflags, &zb); 207 208 if (abuf) { 209 err = dump_data(ba, type, object, blkid * blksz, 210 blksz, abuf->b_data); 211 (void) arc_buf_remove_ref(abuf, &abuf); 212 } 213 } else { 214 err = dump_data(ba, type, object, blkid * blksz, 215 blksz, data); 216 } 217 } 218 219 ASSERT(err == 0 || err == EINTR); 220 return (err); 221 } 222 223 int 224 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin, 225 vnode_t *vp, offset_t *off) 226 { 227 dsl_dataset_t *ds = tosnap->os->os_dsl_dataset; 228 dsl_dataset_t *fromds = fromsnap ? fromsnap->os->os_dsl_dataset : NULL; 229 dmu_replay_record_t *drr; 230 struct backuparg ba; 231 int err; 232 uint64_t fromtxg = 0; 233 234 /* tosnap must be a snapshot */ 235 if (ds->ds_phys->ds_next_snap_obj == 0) 236 return (EINVAL); 237 238 /* fromsnap must be an earlier snapshot from the same fs as tosnap */ 239 if (fromds && (ds->ds_dir != fromds->ds_dir || 240 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg)) 241 return (EXDEV); 242 243 if (fromorigin) { 244 if (fromsnap) 245 return (EINVAL); 246 247 if (ds->ds_dir->dd_phys->dd_origin_obj != NULL) { 248 dsl_pool_t *dp = ds->ds_dir->dd_pool; 249 rw_enter(&dp->dp_config_rwlock, RW_READER); 250 err = dsl_dataset_open_obj(dp, 251 ds->ds_dir->dd_phys->dd_origin_obj, NULL, 252 DS_MODE_NONE, FTAG, &fromds); 253 rw_exit(&dp->dp_config_rwlock); 254 if (err) 255 return (err); 256 } else { 257 fromorigin = B_FALSE; 258 } 259 } 260 261 262 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 263 drr->drr_type = DRR_BEGIN; 264 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 265 drr->drr_u.drr_begin.drr_version = DMU_BACKUP_STREAM_VERSION; 266 drr->drr_u.drr_begin.drr_creation_time = 267 ds->ds_phys->ds_creation_time; 268 drr->drr_u.drr_begin.drr_type = tosnap->os->os_phys->os_type; 269 if (fromorigin) 270 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE; 271 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid; 272 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 273 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA; 274 275 if (fromds) 276 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid; 277 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname); 278 279 if (fromds) 280 fromtxg = fromds->ds_phys->ds_creation_txg; 281 if (fromorigin) 282 dsl_dataset_close(fromds, DS_MODE_NONE, FTAG); 283 284 ba.drr = drr; 285 ba.vp = vp; 286 ba.os = tosnap; 287 ba.off = off; 288 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0); 289 290 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) { 291 kmem_free(drr, sizeof (dmu_replay_record_t)); 292 return (ba.err); 293 } 294 295 err = traverse_dsl_dataset(ds, fromtxg, 296 ADVANCE_PRE | ADVANCE_HOLES | ADVANCE_DATA | ADVANCE_NOLOCK, 297 backup_cb, &ba); 298 299 if (err) { 300 if (err == EINTR && ba.err) 301 err = ba.err; 302 kmem_free(drr, sizeof (dmu_replay_record_t)); 303 return (err); 304 } 305 306 bzero(drr, sizeof (dmu_replay_record_t)); 307 drr->drr_type = DRR_END; 308 drr->drr_u.drr_end.drr_checksum = ba.zc; 309 310 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) { 311 kmem_free(drr, sizeof (dmu_replay_record_t)); 312 return (ba.err); 313 } 314 315 kmem_free(drr, sizeof (dmu_replay_record_t)); 316 317 return (0); 318 } 319 320 struct recvbeginsyncarg { 321 const char *tofs; 322 const char *tosnap; 323 dsl_dataset_t *origin; 324 uint64_t fromguid; 325 dmu_objset_type_t type; 326 void *tag; 327 boolean_t force; 328 uint64_t dsflags; 329 char clonelastname[MAXNAMELEN]; 330 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */ 331 }; 332 333 static dsl_dataset_t * 334 recv_full_sync_impl(dsl_pool_t *dp, uint64_t dsobj, dmu_objset_type_t type, 335 cred_t *cr, dmu_tx_t *tx) 336 { 337 dsl_dataset_t *ds; 338 339 VERIFY(0 == dsl_dataset_open_obj(dp, dsobj, NULL, 340 DS_MODE_EXCLUSIVE, dmu_recv_tag, &ds)); 341 342 if (type != DMU_OST_NONE) { 343 (void) dmu_objset_create_impl(dp->dp_spa, 344 ds, &ds->ds_phys->ds_bp, type, tx); 345 } 346 347 spa_history_internal_log(LOG_DS_REPLAY_FULL_SYNC, 348 ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld", 349 ds->ds_phys->ds_dir_obj); 350 351 return (ds); 352 } 353 354 /* ARGSUSED */ 355 static int 356 recv_full_check(void *arg1, void *arg2, dmu_tx_t *tx) 357 { 358 dsl_dir_t *dd = arg1; 359 struct recvbeginsyncarg *rbsa = arg2; 360 objset_t *mos = dd->dd_pool->dp_meta_objset; 361 uint64_t val; 362 int err; 363 364 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 365 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val); 366 367 if (err != ENOENT) 368 return (err ? err : EEXIST); 369 370 if (rbsa->origin) { 371 /* make sure it's a snap in the same pool */ 372 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool) 373 return (EXDEV); 374 if (rbsa->origin->ds_phys->ds_num_children == 0) 375 return (EINVAL); 376 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid) 377 return (ENODEV); 378 } 379 380 return (0); 381 } 382 383 static void 384 recv_full_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 385 { 386 dsl_dir_t *dd = arg1; 387 struct recvbeginsyncarg *rbsa = arg2; 388 uint64_t dsobj; 389 uint64_t flags = DS_FLAG_INCONSISTENT; 390 391 flags |= rbsa->dsflags; 392 393 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1, 394 rbsa->origin, flags, cr, tx); 395 396 rbsa->ds = recv_full_sync_impl(dd->dd_pool, dsobj, 397 rbsa->origin ? DMU_OST_NONE : rbsa->type, cr, tx); 398 } 399 400 static int 401 recv_full_existing_check(void *arg1, void *arg2, dmu_tx_t *tx) 402 { 403 dsl_dataset_t *ds = arg1; 404 struct recvbeginsyncarg *rbsa = arg2; 405 int err; 406 407 /* must be a head ds */ 408 if (ds->ds_phys->ds_next_snap_obj != 0) 409 return (EINVAL); 410 411 /* must not be a clone ds */ 412 if (ds->ds_prev != NULL) 413 return (EINVAL); 414 415 err = dsl_dataset_destroy_check(ds, rbsa->tag, tx); 416 if (err) 417 return (err); 418 419 if (rbsa->origin) { 420 /* make sure it's a snap in the same pool */ 421 if (rbsa->origin->ds_dir->dd_pool != ds->ds_dir->dd_pool) 422 return (EXDEV); 423 if (rbsa->origin->ds_phys->ds_num_children == 0) 424 return (EINVAL); 425 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid) 426 return (ENODEV); 427 } 428 429 return (0); 430 } 431 432 static void 433 recv_full_existing_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 434 { 435 dsl_dataset_t *ds = arg1; 436 struct recvbeginsyncarg *rbsa = arg2; 437 dsl_dir_t *dd = ds->ds_dir; 438 uint64_t dsobj; 439 uint64_t flags = DS_FLAG_INCONSISTENT; 440 441 flags |= rbsa->dsflags; 442 443 /* 444 * NB: caller must provide an extra hold on the dsl_dir_t, so it 445 * won't go away when dsl_dataset_destroy_sync() closes the 446 * dataset. 447 */ 448 dsl_dataset_destroy_sync(ds, rbsa->tag, cr, tx); 449 450 dsobj = dsl_dataset_create_sync_impl(dd, rbsa->origin, flags, tx); 451 452 rbsa->ds = recv_full_sync_impl(dd->dd_pool, dsobj, 453 rbsa->origin ? DMU_OST_NONE : rbsa->type, cr, tx); 454 } 455 456 /* ARGSUSED */ 457 static int 458 recv_incremental_check(void *arg1, void *arg2, dmu_tx_t *tx) 459 { 460 dsl_dataset_t *ds = arg1; 461 struct recvbeginsyncarg *rbsa = arg2; 462 int err; 463 uint64_t val; 464 465 /* must not have any changes since most recent snapshot */ 466 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds)) 467 return (ETXTBSY); 468 469 /* must already be a snapshot of this fs */ 470 if (ds->ds_phys->ds_prev_snap_obj == 0) 471 return (ENODEV); 472 473 /* most recent snapshot must match fromguid */ 474 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) 475 return (ENODEV); 476 477 /* temporary clone name must not exist */ 478 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 479 ds->ds_dir->dd_phys->dd_child_dir_zapobj, 480 rbsa->clonelastname, 8, 1, &val); 481 if (err == 0) 482 return (EEXIST); 483 if (err != ENOENT) 484 return (err); 485 486 /* new snapshot name must not exist */ 487 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 488 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val); 489 if (err == 0) 490 return (EEXIST); 491 if (err != ENOENT) 492 return (err); 493 return (0); 494 } 495 496 /* ARGSUSED */ 497 static void 498 recv_online_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 499 { 500 dsl_dataset_t *ohds = arg1; 501 struct recvbeginsyncarg *rbsa = arg2; 502 dsl_pool_t *dp = ohds->ds_dir->dd_pool; 503 dsl_dataset_t *ods, *cds; 504 uint64_t dsobj; 505 uint64_t flags = DS_FLAG_INCONSISTENT; 506 507 flags |= rbsa->dsflags; 508 509 /* create the temporary clone */ 510 VERIFY(0 == dsl_dataset_open_obj(dp, ohds->ds_phys->ds_prev_snap_obj, 511 NULL, DS_MODE_STANDARD, FTAG, &ods)); 512 dsobj = dsl_dataset_create_sync(ohds->ds_dir, 513 rbsa->clonelastname, ods, flags, cr, tx); 514 dsl_dataset_close(ods, DS_MODE_STANDARD, FTAG); 515 516 /* open the temporary clone */ 517 VERIFY(0 == dsl_dataset_open_obj(dp, dsobj, NULL, 518 DS_MODE_EXCLUSIVE, dmu_recv_tag, &cds)); 519 520 /* copy the refquota from the target fs to the clone */ 521 if (ohds->ds_quota > 0) 522 dsl_dataset_set_quota_sync(cds, &ohds->ds_quota, cr, tx); 523 524 rbsa->ds = cds; 525 526 spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC, 527 dp->dp_spa, tx, cr, "dataset = %lld", 528 cds->ds_phys->ds_dir_obj); 529 } 530 531 /* ARGSUSED */ 532 static void 533 recv_offline_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 534 { 535 dsl_dataset_t *ds = arg1; 536 537 dmu_buf_will_dirty(ds->ds_dbuf, tx); 538 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 539 540 spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC, 541 ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld", 542 ds->ds_phys->ds_dir_obj); 543 } 544 545 /* 546 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin() 547 * succeeds; otherwise we will leak the holds on the datasets. 548 */ 549 int 550 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb, 551 boolean_t force, objset_t *origin, boolean_t online, dmu_recv_cookie_t *drc) 552 { 553 int err = 0; 554 boolean_t byteswap; 555 struct recvbeginsyncarg rbsa; 556 uint64_t version; 557 int flags; 558 dsl_dataset_t *ds; 559 560 if (drrb->drr_magic == DMU_BACKUP_MAGIC) 561 byteswap = FALSE; 562 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 563 byteswap = TRUE; 564 else 565 return (EINVAL); 566 567 rbsa.tofs = tofs; 568 rbsa.tosnap = tosnap; 569 rbsa.origin = origin ? origin->os->os_dsl_dataset : NULL; 570 rbsa.fromguid = drrb->drr_fromguid; 571 rbsa.type = drrb->drr_type; 572 rbsa.tag = FTAG; 573 rbsa.dsflags = 0; 574 version = drrb->drr_version; 575 flags = drrb->drr_flags; 576 577 if (byteswap) { 578 rbsa.type = BSWAP_32(rbsa.type); 579 rbsa.fromguid = BSWAP_64(rbsa.fromguid); 580 version = BSWAP_64(version); 581 flags = BSWAP_32(flags); 582 } 583 584 if (version != DMU_BACKUP_STREAM_VERSION || 585 rbsa.type >= DMU_OST_NUMTYPES || 586 ((flags & DRR_FLAG_CLONE) && origin == NULL)) 587 return (EINVAL); 588 589 if (flags & DRR_FLAG_CI_DATA) 590 rbsa.dsflags = DS_FLAG_CI_DATASET; 591 592 bzero(drc, sizeof (dmu_recv_cookie_t)); 593 drc->drc_drrb = drrb; 594 drc->drc_tosnap = tosnap; 595 drc->drc_force = force; 596 597 /* 598 * Process the begin in syncing context. 599 */ 600 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE) && !online) { 601 /* offline incremental receive */ 602 err = dsl_dataset_open(tofs, 603 DS_MODE_EXCLUSIVE, dmu_recv_tag, &ds); 604 if (err) 605 return (err); 606 607 /* 608 * Only do the rollback if the most recent snapshot 609 * matches the incremental source 610 */ 611 if (force) { 612 if (ds->ds_prev == NULL || 613 ds->ds_prev->ds_phys->ds_guid != 614 rbsa.fromguid) { 615 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, 616 dmu_recv_tag); 617 return (ENODEV); 618 } 619 (void) dsl_dataset_rollback(ds, DMU_OST_NONE); 620 } 621 rbsa.force = B_FALSE; 622 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 623 recv_incremental_check, 624 recv_offline_incremental_sync, 625 ds, &rbsa, 1); 626 if (err) { 627 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, dmu_recv_tag); 628 return (err); 629 } 630 drc->drc_logical_ds = drc->drc_real_ds = ds; 631 } else if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE)) { 632 /* online incremental receive */ 633 634 /* tmp clone name is: tofs/%tosnap" */ 635 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname), 636 "%%%s", tosnap); 637 638 /* open the dataset we are logically receiving into */ 639 err = dsl_dataset_open(tofs, 640 DS_MODE_STANDARD, dmu_recv_tag, &ds); 641 if (err) 642 return (err); 643 644 rbsa.force = force; 645 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 646 recv_incremental_check, 647 recv_online_incremental_sync, ds, &rbsa, 5); 648 if (err) { 649 dsl_dataset_close(ds, DS_MODE_STANDARD, dmu_recv_tag); 650 return (err); 651 } 652 drc->drc_logical_ds = ds; 653 drc->drc_real_ds = rbsa.ds; 654 } else { 655 /* create new fs -- full backup or clone */ 656 dsl_dir_t *dd = NULL; 657 const char *tail; 658 659 err = dsl_dir_open(tofs, FTAG, &dd, &tail); 660 if (err) 661 return (err); 662 if (tail == NULL) { 663 if (!force) { 664 dsl_dir_close(dd, FTAG); 665 return (EEXIST); 666 } 667 668 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 669 err = dsl_dataset_open_obj(dd->dd_pool, 670 dd->dd_phys->dd_head_dataset_obj, NULL, 671 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, 672 FTAG, &ds); 673 rw_exit(&dd->dd_pool->dp_config_rwlock); 674 if (err) { 675 dsl_dir_close(dd, FTAG); 676 return (err); 677 } 678 679 err = dsl_sync_task_do(dd->dd_pool, 680 recv_full_existing_check, 681 recv_full_existing_sync, ds, &rbsa, 5); 682 /* if successful, sync task closes the ds for us */ 683 if (err) 684 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 685 } else { 686 err = dsl_sync_task_do(dd->dd_pool, recv_full_check, 687 recv_full_sync, dd, &rbsa, 5); 688 if (err) 689 return (err); 690 } 691 dsl_dir_close(dd, FTAG); 692 if (err) 693 return (err); 694 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds; 695 drc->drc_newfs = B_TRUE; 696 } 697 698 /* downgrade our hold on the ds from EXCLUSIVE to PRIMARY */ 699 dsl_dataset_downgrade(drc->drc_real_ds, 700 DS_MODE_EXCLUSIVE, DS_MODE_PRIMARY); 701 702 return (0); 703 } 704 705 struct restorearg { 706 int err; 707 int byteswap; 708 vnode_t *vp; 709 char *buf; 710 uint64_t voff; 711 int bufsize; /* amount of memory allocated for buf */ 712 zio_cksum_t cksum; 713 }; 714 715 static void * 716 restore_read(struct restorearg *ra, int len) 717 { 718 void *rv; 719 int done = 0; 720 721 /* some things will require 8-byte alignment, so everything must */ 722 ASSERT3U(len % 8, ==, 0); 723 724 while (done < len) { 725 ssize_t resid; 726 727 ra->err = vn_rdwr(UIO_READ, ra->vp, 728 (caddr_t)ra->buf + done, len - done, 729 ra->voff, UIO_SYSSPACE, FAPPEND, 730 RLIM64_INFINITY, CRED(), &resid); 731 732 if (resid == len - done) 733 ra->err = EINVAL; 734 ra->voff += len - done - resid; 735 done = len - resid; 736 if (ra->err) 737 return (NULL); 738 } 739 740 ASSERT3U(done, ==, len); 741 rv = ra->buf; 742 if (ra->byteswap) 743 fletcher_4_incremental_byteswap(rv, len, &ra->cksum); 744 else 745 fletcher_4_incremental_native(rv, len, &ra->cksum); 746 return (rv); 747 } 748 749 static void 750 backup_byteswap(dmu_replay_record_t *drr) 751 { 752 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 753 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 754 drr->drr_type = BSWAP_32(drr->drr_type); 755 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen); 756 switch (drr->drr_type) { 757 case DRR_BEGIN: 758 DO64(drr_begin.drr_magic); 759 DO64(drr_begin.drr_version); 760 DO64(drr_begin.drr_creation_time); 761 DO32(drr_begin.drr_type); 762 DO32(drr_begin.drr_flags); 763 DO64(drr_begin.drr_toguid); 764 DO64(drr_begin.drr_fromguid); 765 break; 766 case DRR_OBJECT: 767 DO64(drr_object.drr_object); 768 /* DO64(drr_object.drr_allocation_txg); */ 769 DO32(drr_object.drr_type); 770 DO32(drr_object.drr_bonustype); 771 DO32(drr_object.drr_blksz); 772 DO32(drr_object.drr_bonuslen); 773 break; 774 case DRR_FREEOBJECTS: 775 DO64(drr_freeobjects.drr_firstobj); 776 DO64(drr_freeobjects.drr_numobjs); 777 break; 778 case DRR_WRITE: 779 DO64(drr_write.drr_object); 780 DO32(drr_write.drr_type); 781 DO64(drr_write.drr_offset); 782 DO64(drr_write.drr_length); 783 break; 784 case DRR_FREE: 785 DO64(drr_free.drr_object); 786 DO64(drr_free.drr_offset); 787 DO64(drr_free.drr_length); 788 break; 789 case DRR_END: 790 DO64(drr_end.drr_checksum.zc_word[0]); 791 DO64(drr_end.drr_checksum.zc_word[1]); 792 DO64(drr_end.drr_checksum.zc_word[2]); 793 DO64(drr_end.drr_checksum.zc_word[3]); 794 break; 795 } 796 #undef DO64 797 #undef DO32 798 } 799 800 static int 801 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) 802 { 803 int err; 804 dmu_tx_t *tx; 805 806 err = dmu_object_info(os, drro->drr_object, NULL); 807 808 if (err != 0 && err != ENOENT) 809 return (EINVAL); 810 811 if (drro->drr_type == DMU_OT_NONE || 812 drro->drr_type >= DMU_OT_NUMTYPES || 813 drro->drr_bonustype >= DMU_OT_NUMTYPES || 814 drro->drr_checksum >= ZIO_CHECKSUM_FUNCTIONS || 815 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 816 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 817 drro->drr_blksz < SPA_MINBLOCKSIZE || 818 drro->drr_blksz > SPA_MAXBLOCKSIZE || 819 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 820 return (EINVAL); 821 } 822 823 tx = dmu_tx_create(os); 824 825 if (err == ENOENT) { 826 /* currently free, want to be allocated */ 827 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 828 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 1); 829 err = dmu_tx_assign(tx, TXG_WAIT); 830 if (err) { 831 dmu_tx_abort(tx); 832 return (err); 833 } 834 err = dmu_object_claim(os, drro->drr_object, 835 drro->drr_type, drro->drr_blksz, 836 drro->drr_bonustype, drro->drr_bonuslen, tx); 837 } else { 838 /* currently allocated, want to be allocated */ 839 dmu_tx_hold_bonus(tx, drro->drr_object); 840 /* 841 * We may change blocksize, so need to 842 * hold_write 843 */ 844 dmu_tx_hold_write(tx, drro->drr_object, 0, 1); 845 err = dmu_tx_assign(tx, TXG_WAIT); 846 if (err) { 847 dmu_tx_abort(tx); 848 return (err); 849 } 850 851 err = dmu_object_reclaim(os, drro->drr_object, 852 drro->drr_type, drro->drr_blksz, 853 drro->drr_bonustype, drro->drr_bonuslen, tx); 854 } 855 if (err) { 856 dmu_tx_commit(tx); 857 return (EINVAL); 858 } 859 860 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksum, tx); 861 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); 862 863 if (drro->drr_bonuslen) { 864 dmu_buf_t *db; 865 void *data; 866 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); 867 dmu_buf_will_dirty(db, tx); 868 869 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 870 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8)); 871 if (data == NULL) { 872 dmu_tx_commit(tx); 873 return (ra->err); 874 } 875 bcopy(data, db->db_data, drro->drr_bonuslen); 876 if (ra->byteswap) { 877 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data, 878 drro->drr_bonuslen); 879 } 880 dmu_buf_rele(db, FTAG); 881 } 882 dmu_tx_commit(tx); 883 return (0); 884 } 885 886 /* ARGSUSED */ 887 static int 888 restore_freeobjects(struct restorearg *ra, objset_t *os, 889 struct drr_freeobjects *drrfo) 890 { 891 uint64_t obj; 892 893 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 894 return (EINVAL); 895 896 for (obj = drrfo->drr_firstobj; 897 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 898 (void) dmu_object_next(os, &obj, FALSE, 0)) { 899 dmu_tx_t *tx; 900 int err; 901 902 if (dmu_object_info(os, obj, NULL) != 0) 903 continue; 904 905 tx = dmu_tx_create(os); 906 dmu_tx_hold_bonus(tx, obj); 907 err = dmu_tx_assign(tx, TXG_WAIT); 908 if (err) { 909 dmu_tx_abort(tx); 910 return (err); 911 } 912 err = dmu_object_free(os, obj, tx); 913 dmu_tx_commit(tx); 914 if (err && err != ENOENT) 915 return (EINVAL); 916 } 917 return (0); 918 } 919 920 static int 921 restore_write(struct restorearg *ra, objset_t *os, 922 struct drr_write *drrw) 923 { 924 dmu_tx_t *tx; 925 void *data; 926 int err; 927 928 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 929 drrw->drr_type >= DMU_OT_NUMTYPES) 930 return (EINVAL); 931 932 data = restore_read(ra, drrw->drr_length); 933 if (data == NULL) 934 return (ra->err); 935 936 if (dmu_object_info(os, drrw->drr_object, NULL) != 0) 937 return (EINVAL); 938 939 tx = dmu_tx_create(os); 940 941 dmu_tx_hold_write(tx, drrw->drr_object, 942 drrw->drr_offset, drrw->drr_length); 943 err = dmu_tx_assign(tx, TXG_WAIT); 944 if (err) { 945 dmu_tx_abort(tx); 946 return (err); 947 } 948 if (ra->byteswap) 949 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length); 950 dmu_write(os, drrw->drr_object, 951 drrw->drr_offset, drrw->drr_length, data, tx); 952 dmu_tx_commit(tx); 953 return (0); 954 } 955 956 /* ARGSUSED */ 957 static int 958 restore_free(struct restorearg *ra, objset_t *os, 959 struct drr_free *drrf) 960 { 961 dmu_tx_t *tx; 962 int err; 963 964 if (drrf->drr_length != -1ULL && 965 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 966 return (EINVAL); 967 968 if (dmu_object_info(os, drrf->drr_object, NULL) != 0) 969 return (EINVAL); 970 971 tx = dmu_tx_create(os); 972 973 dmu_tx_hold_free(tx, drrf->drr_object, 974 drrf->drr_offset, drrf->drr_length); 975 err = dmu_tx_assign(tx, TXG_WAIT); 976 if (err) { 977 dmu_tx_abort(tx); 978 return (err); 979 } 980 err = dmu_free_range(os, drrf->drr_object, 981 drrf->drr_offset, drrf->drr_length, tx); 982 dmu_tx_commit(tx); 983 return (err); 984 } 985 986 void 987 dmu_recv_abort_cleanup(dmu_recv_cookie_t *drc) 988 { 989 if (drc->drc_newfs || drc->drc_real_ds != drc->drc_logical_ds) { 990 /* 991 * online incremental or new fs: destroy the fs (which 992 * may be a clone) that we created 993 */ 994 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag); 995 if (drc->drc_real_ds != drc->drc_logical_ds) { 996 dsl_dataset_close(drc->drc_logical_ds, 997 DS_MODE_STANDARD, dmu_recv_tag); 998 } 999 } else { 1000 /* 1001 * offline incremental: rollback to most recent snapshot. 1002 */ 1003 int lmode = DS_MODE_PRIMARY; 1004 if (dsl_dataset_tryupgrade(drc->drc_real_ds, 1005 DS_MODE_PRIMARY, DS_MODE_EXCLUSIVE)) { 1006 lmode = DS_MODE_EXCLUSIVE; 1007 (void) dsl_dataset_rollback(drc->drc_real_ds, 1008 DMU_OST_NONE); 1009 } 1010 dsl_dataset_close(drc->drc_real_ds, lmode, FTAG); 1011 } 1012 } 1013 1014 /* 1015 * NB: callers *must* call dmu_recv_end() if this succeeds. 1016 */ 1017 int 1018 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp) 1019 { 1020 struct restorearg ra = { 0 }; 1021 dmu_replay_record_t *drr; 1022 objset_t *os; 1023 zio_cksum_t pcksum; 1024 1025 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 1026 ra.byteswap = TRUE; 1027 1028 { 1029 /* compute checksum of drr_begin record */ 1030 dmu_replay_record_t *drr; 1031 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 1032 1033 drr->drr_type = DRR_BEGIN; 1034 drr->drr_u.drr_begin = *drc->drc_drrb; 1035 if (ra.byteswap) { 1036 fletcher_4_incremental_byteswap(drr, 1037 sizeof (dmu_replay_record_t), &ra.cksum); 1038 } else { 1039 fletcher_4_incremental_native(drr, 1040 sizeof (dmu_replay_record_t), &ra.cksum); 1041 } 1042 kmem_free(drr, sizeof (dmu_replay_record_t)); 1043 } 1044 1045 if (ra.byteswap) { 1046 struct drr_begin *drrb = drc->drc_drrb; 1047 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 1048 drrb->drr_version = BSWAP_64(drrb->drr_version); 1049 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 1050 drrb->drr_type = BSWAP_32(drrb->drr_type); 1051 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 1052 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 1053 } 1054 1055 ra.vp = vp; 1056 ra.voff = *voffp; 1057 ra.bufsize = 1<<20; 1058 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); 1059 1060 /* these were verified in dmu_recv_begin */ 1061 ASSERT(drc->drc_drrb->drr_version == DMU_BACKUP_STREAM_VERSION); 1062 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES); 1063 1064 /* 1065 * Open the objset we are modifying. 1066 */ 1067 VERIFY(dmu_objset_open_ds(drc->drc_real_ds, DMU_OST_ANY, &os) == 0); 1068 1069 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT); 1070 1071 /* 1072 * Read records and process them. 1073 */ 1074 pcksum = ra.cksum; 1075 while (ra.err == 0 && 1076 NULL != (drr = restore_read(&ra, sizeof (*drr)))) { 1077 if (issig(JUSTLOOKING) && issig(FORREAL)) { 1078 ra.err = EINTR; 1079 goto out; 1080 } 1081 1082 if (ra.byteswap) 1083 backup_byteswap(drr); 1084 1085 switch (drr->drr_type) { 1086 case DRR_OBJECT: 1087 { 1088 /* 1089 * We need to make a copy of the record header, 1090 * because restore_{object,write} may need to 1091 * restore_read(), which will invalidate drr. 1092 */ 1093 struct drr_object drro = drr->drr_u.drr_object; 1094 ra.err = restore_object(&ra, os, &drro); 1095 break; 1096 } 1097 case DRR_FREEOBJECTS: 1098 { 1099 struct drr_freeobjects drrfo = 1100 drr->drr_u.drr_freeobjects; 1101 ra.err = restore_freeobjects(&ra, os, &drrfo); 1102 break; 1103 } 1104 case DRR_WRITE: 1105 { 1106 struct drr_write drrw = drr->drr_u.drr_write; 1107 ra.err = restore_write(&ra, os, &drrw); 1108 break; 1109 } 1110 case DRR_FREE: 1111 { 1112 struct drr_free drrf = drr->drr_u.drr_free; 1113 ra.err = restore_free(&ra, os, &drrf); 1114 break; 1115 } 1116 case DRR_END: 1117 { 1118 struct drr_end drre = drr->drr_u.drr_end; 1119 /* 1120 * We compare against the *previous* checksum 1121 * value, because the stored checksum is of 1122 * everything before the DRR_END record. 1123 */ 1124 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum)) 1125 ra.err = ECKSUM; 1126 goto out; 1127 } 1128 default: 1129 ra.err = EINVAL; 1130 goto out; 1131 } 1132 pcksum = ra.cksum; 1133 } 1134 ASSERT(ra.err != 0); 1135 1136 out: 1137 dmu_objset_close(os); 1138 1139 if (ra.err != 0) { 1140 /* 1141 * rollback or destroy what we created, so we don't 1142 * leave it in the restoring state. 1143 */ 1144 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0); 1145 dmu_recv_abort_cleanup(drc); 1146 } 1147 1148 kmem_free(ra.buf, ra.bufsize); 1149 *voffp = ra.voff; 1150 return (ra.err); 1151 } 1152 1153 struct recvendsyncarg { 1154 char *tosnap; 1155 uint64_t creation_time; 1156 uint64_t toguid; 1157 }; 1158 1159 static int 1160 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx) 1161 { 1162 dsl_dataset_t *ds = arg1; 1163 struct recvendsyncarg *resa = arg2; 1164 1165 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx)); 1166 } 1167 1168 static void 1169 recv_end_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1170 { 1171 dsl_dataset_t *ds = arg1; 1172 struct recvendsyncarg *resa = arg2; 1173 1174 dsl_dataset_snapshot_sync(ds, resa->tosnap, cr, tx); 1175 1176 /* set snapshot's creation time and guid */ 1177 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1178 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time; 1179 ds->ds_prev->ds_phys->ds_guid = resa->toguid; 1180 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1181 1182 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1183 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1184 } 1185 1186 int 1187 dmu_recv_end(dmu_recv_cookie_t *drc) 1188 { 1189 int err = 0; 1190 int lmode; 1191 1192 /* 1193 * XXX hack; seems the ds is still dirty and 1194 * dsl_pool_zil_clean() expects it to have a ds_user_ptr (and 1195 * zil), but clone_swap() can close it. 1196 */ 1197 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0); 1198 1199 if (dsl_dataset_tryupgrade(drc->drc_real_ds, 1200 DS_MODE_PRIMARY, DS_MODE_EXCLUSIVE)) { 1201 lmode = DS_MODE_EXCLUSIVE; 1202 } else { 1203 dmu_recv_abort_cleanup(drc); 1204 return (EBUSY); 1205 } 1206 1207 if (drc->drc_logical_ds != drc->drc_real_ds) { 1208 if (err == 0 && dsl_dataset_tryupgrade(drc->drc_logical_ds, 1209 DS_MODE_STANDARD, DS_MODE_EXCLUSIVE)) { 1210 lmode = DS_MODE_EXCLUSIVE; 1211 err = dsl_dataset_clone_swap(drc->drc_real_ds, 1212 drc->drc_logical_ds, drc->drc_force); 1213 } else { 1214 lmode = DS_MODE_STANDARD; 1215 err = EBUSY; 1216 } 1217 } 1218 1219 if (err == 0) { 1220 struct recvendsyncarg resa; 1221 1222 resa.creation_time = drc->drc_drrb->drr_creation_time; 1223 resa.toguid = drc->drc_drrb->drr_toguid; 1224 resa.tosnap = drc->drc_tosnap; 1225 1226 err = dsl_sync_task_do(drc->drc_real_ds->ds_dir->dd_pool, 1227 recv_end_check, recv_end_sync, 1228 drc->drc_logical_ds, &resa, 3); 1229 if (err) { 1230 if (drc->drc_newfs) { 1231 ASSERT(drc->drc_logical_ds == drc->drc_real_ds); 1232 (void) dsl_dataset_destroy(drc->drc_real_ds, 1233 dmu_recv_tag); 1234 return (err); 1235 } else { 1236 (void) dsl_dataset_rollback(drc->drc_logical_ds, 1237 DMU_OST_NONE); 1238 } 1239 } 1240 } 1241 1242 if (drc->drc_logical_ds != drc->drc_real_ds) { 1243 /* dsl_dataset_destroy() will close the ds */ 1244 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag); 1245 } 1246 /* close the hold from dmu_recv_begin */ 1247 dsl_dataset_close(drc->drc_logical_ds, lmode, dmu_recv_tag); 1248 return (err); 1249 } 1250