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