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 struct dsl_ds_destroyarg dsda = {0}; 397 398 /* must be a head ds */ 399 if (ds->ds_phys->ds_next_snap_obj != 0) 400 return (EINVAL); 401 402 /* must not be a clone ds */ 403 if (dsl_dir_is_clone(ds->ds_dir)) 404 return (EINVAL); 405 406 dsda.ds = ds; 407 err = dsl_dataset_destroy_check(&dsda, rbsa->tag, tx); 408 if (err) 409 return (err); 410 411 if (rbsa->origin) { 412 /* make sure it's a snap in the same pool */ 413 if (rbsa->origin->ds_dir->dd_pool != ds->ds_dir->dd_pool) 414 return (EXDEV); 415 if (rbsa->origin->ds_phys->ds_num_children == 0) 416 return (EINVAL); 417 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid) 418 return (ENODEV); 419 } 420 421 return (0); 422 } 423 424 static void 425 recv_full_existing_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 426 { 427 dsl_dataset_t *ds = arg1; 428 struct recvbeginsyncarg *rbsa = arg2; 429 dsl_dir_t *dd = ds->ds_dir; 430 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags; 431 uint64_t dsobj; 432 struct dsl_ds_destroyarg dsda = {0}; 433 434 /* 435 * NB: caller must provide an extra hold on the dsl_dir_t, so it 436 * won't go away when dsl_dataset_destroy_sync() closes the 437 * dataset. 438 */ 439 dsda.ds = ds; 440 dsl_dataset_destroy_sync(&dsda, rbsa->tag, cr, tx); 441 ASSERT3P(dsda.rm_origin, ==, NULL); 442 443 dsobj = dsl_dataset_create_sync_dd(dd, rbsa->origin, flags, tx); 444 445 rbsa->ds = recv_full_sync_impl(dd->dd_pool, dsobj, 446 rbsa->origin ? DMU_OST_NONE : rbsa->type, cr, tx); 447 } 448 449 /* ARGSUSED */ 450 static int 451 recv_incremental_check(void *arg1, void *arg2, dmu_tx_t *tx) 452 { 453 dsl_dataset_t *ds = arg1; 454 struct recvbeginsyncarg *rbsa = arg2; 455 int err; 456 uint64_t val; 457 458 /* must not have any changes since most recent snapshot */ 459 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds)) 460 return (ETXTBSY); 461 462 /* must already be a snapshot of this fs */ 463 if (ds->ds_phys->ds_prev_snap_obj == 0) 464 return (ENODEV); 465 466 /* most recent snapshot must match fromguid */ 467 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) 468 return (ENODEV); 469 470 /* temporary clone name must not exist */ 471 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 472 ds->ds_dir->dd_phys->dd_child_dir_zapobj, 473 rbsa->clonelastname, 8, 1, &val); 474 if (err == 0) 475 return (EEXIST); 476 if (err != ENOENT) 477 return (err); 478 479 /* new snapshot name must not exist */ 480 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 481 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val); 482 if (err == 0) 483 return (EEXIST); 484 if (err != ENOENT) 485 return (err); 486 return (0); 487 } 488 489 /* ARGSUSED */ 490 static void 491 recv_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 492 { 493 dsl_dataset_t *ohds = arg1; 494 struct recvbeginsyncarg *rbsa = arg2; 495 dsl_pool_t *dp = ohds->ds_dir->dd_pool; 496 dsl_dataset_t *ods, *cds; 497 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags; 498 uint64_t dsobj; 499 500 /* create the temporary clone */ 501 VERIFY(0 == dsl_dataset_hold_obj(dp, ohds->ds_phys->ds_prev_snap_obj, 502 FTAG, &ods)); 503 dsobj = dsl_dataset_create_sync(ohds->ds_dir, 504 rbsa->clonelastname, ods, flags, cr, tx); 505 dsl_dataset_rele(ods, FTAG); 506 507 /* open the temporary clone */ 508 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, 509 DS_MODE_INCONSISTENT, dmu_recv_tag, &cds)); 510 511 /* copy the refquota from the target fs to the clone */ 512 if (ohds->ds_quota > 0) 513 dsl_dataset_set_quota_sync(cds, &ohds->ds_quota, cr, tx); 514 515 rbsa->ds = cds; 516 517 spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC, 518 dp->dp_spa, tx, cr, "dataset = %lld", dsobj); 519 } 520 521 /* 522 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin() 523 * succeeds; otherwise we will leak the holds on the datasets. 524 */ 525 int 526 dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb, 527 boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc) 528 { 529 int err = 0; 530 boolean_t byteswap; 531 struct recvbeginsyncarg rbsa; 532 uint64_t version; 533 int flags; 534 dsl_dataset_t *ds; 535 536 if (drrb->drr_magic == DMU_BACKUP_MAGIC) 537 byteswap = FALSE; 538 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 539 byteswap = TRUE; 540 else 541 return (EINVAL); 542 543 rbsa.tofs = tofs; 544 rbsa.tosnap = tosnap; 545 rbsa.origin = origin ? origin->os->os_dsl_dataset : NULL; 546 rbsa.fromguid = drrb->drr_fromguid; 547 rbsa.type = drrb->drr_type; 548 rbsa.tag = FTAG; 549 rbsa.dsflags = 0; 550 version = drrb->drr_version; 551 flags = drrb->drr_flags; 552 553 if (byteswap) { 554 rbsa.type = BSWAP_32(rbsa.type); 555 rbsa.fromguid = BSWAP_64(rbsa.fromguid); 556 version = BSWAP_64(version); 557 flags = BSWAP_32(flags); 558 } 559 560 if (version != DMU_BACKUP_STREAM_VERSION || 561 rbsa.type >= DMU_OST_NUMTYPES || 562 ((flags & DRR_FLAG_CLONE) && origin == NULL)) 563 return (EINVAL); 564 565 if (flags & DRR_FLAG_CI_DATA) 566 rbsa.dsflags = DS_FLAG_CI_DATASET; 567 568 bzero(drc, sizeof (dmu_recv_cookie_t)); 569 drc->drc_drrb = drrb; 570 drc->drc_tosnap = tosnap; 571 drc->drc_force = force; 572 573 /* 574 * Process the begin in syncing context. 575 */ 576 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE)) { 577 /* incremental receive */ 578 579 /* tmp clone name is: tofs/%tosnap" */ 580 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname), 581 "%%%s", tosnap); 582 583 /* open the dataset we are logically receiving into */ 584 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds); 585 if (err) 586 return (err); 587 588 /* must not have an incremental recv already in progress */ 589 if (!mutex_tryenter(&ds->ds_recvlock)) { 590 dsl_dataset_rele(ds, dmu_recv_tag); 591 return (EBUSY); 592 } 593 594 rbsa.force = force; 595 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 596 recv_incremental_check, 597 recv_incremental_sync, ds, &rbsa, 5); 598 if (err) { 599 mutex_exit(&ds->ds_recvlock); 600 dsl_dataset_rele(ds, dmu_recv_tag); 601 return (err); 602 } 603 drc->drc_logical_ds = ds; 604 drc->drc_real_ds = rbsa.ds; 605 } else { 606 /* create new fs -- full backup or clone */ 607 dsl_dir_t *dd = NULL; 608 const char *tail; 609 610 err = dsl_dir_open(tofs, FTAG, &dd, &tail); 611 if (err) 612 return (err); 613 if (tail == NULL) { 614 if (!force) { 615 dsl_dir_close(dd, FTAG); 616 return (EEXIST); 617 } 618 619 rw_enter(&dd->dd_pool->dp_config_rwlock, RW_READER); 620 err = dsl_dataset_own_obj(dd->dd_pool, 621 dd->dd_phys->dd_head_dataset_obj, 622 DS_MODE_INCONSISTENT, FTAG, &ds); 623 rw_exit(&dd->dd_pool->dp_config_rwlock); 624 if (err) { 625 dsl_dir_close(dd, FTAG); 626 return (err); 627 } 628 629 dsl_dataset_make_exclusive(ds, FTAG); 630 err = dsl_sync_task_do(dd->dd_pool, 631 recv_full_existing_check, 632 recv_full_existing_sync, ds, &rbsa, 5); 633 dsl_dataset_disown(ds, FTAG); 634 } else { 635 err = dsl_sync_task_do(dd->dd_pool, recv_full_check, 636 recv_full_sync, dd, &rbsa, 5); 637 } 638 dsl_dir_close(dd, FTAG); 639 if (err) 640 return (err); 641 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds; 642 drc->drc_newfs = B_TRUE; 643 } 644 645 return (0); 646 } 647 648 struct restorearg { 649 int err; 650 int byteswap; 651 vnode_t *vp; 652 char *buf; 653 uint64_t voff; 654 int bufsize; /* amount of memory allocated for buf */ 655 zio_cksum_t cksum; 656 }; 657 658 static void * 659 restore_read(struct restorearg *ra, int len) 660 { 661 void *rv; 662 int done = 0; 663 664 /* some things will require 8-byte alignment, so everything must */ 665 ASSERT3U(len % 8, ==, 0); 666 667 while (done < len) { 668 ssize_t resid; 669 670 ra->err = vn_rdwr(UIO_READ, ra->vp, 671 (caddr_t)ra->buf + done, len - done, 672 ra->voff, UIO_SYSSPACE, FAPPEND, 673 RLIM64_INFINITY, CRED(), &resid); 674 675 if (resid == len - done) 676 ra->err = EINVAL; 677 ra->voff += len - done - resid; 678 done = len - resid; 679 if (ra->err) 680 return (NULL); 681 } 682 683 ASSERT3U(done, ==, len); 684 rv = ra->buf; 685 if (ra->byteswap) 686 fletcher_4_incremental_byteswap(rv, len, &ra->cksum); 687 else 688 fletcher_4_incremental_native(rv, len, &ra->cksum); 689 return (rv); 690 } 691 692 static void 693 backup_byteswap(dmu_replay_record_t *drr) 694 { 695 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 696 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 697 drr->drr_type = BSWAP_32(drr->drr_type); 698 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen); 699 switch (drr->drr_type) { 700 case DRR_BEGIN: 701 DO64(drr_begin.drr_magic); 702 DO64(drr_begin.drr_version); 703 DO64(drr_begin.drr_creation_time); 704 DO32(drr_begin.drr_type); 705 DO32(drr_begin.drr_flags); 706 DO64(drr_begin.drr_toguid); 707 DO64(drr_begin.drr_fromguid); 708 break; 709 case DRR_OBJECT: 710 DO64(drr_object.drr_object); 711 /* DO64(drr_object.drr_allocation_txg); */ 712 DO32(drr_object.drr_type); 713 DO32(drr_object.drr_bonustype); 714 DO32(drr_object.drr_blksz); 715 DO32(drr_object.drr_bonuslen); 716 break; 717 case DRR_FREEOBJECTS: 718 DO64(drr_freeobjects.drr_firstobj); 719 DO64(drr_freeobjects.drr_numobjs); 720 break; 721 case DRR_WRITE: 722 DO64(drr_write.drr_object); 723 DO32(drr_write.drr_type); 724 DO64(drr_write.drr_offset); 725 DO64(drr_write.drr_length); 726 break; 727 case DRR_FREE: 728 DO64(drr_free.drr_object); 729 DO64(drr_free.drr_offset); 730 DO64(drr_free.drr_length); 731 break; 732 case DRR_END: 733 DO64(drr_end.drr_checksum.zc_word[0]); 734 DO64(drr_end.drr_checksum.zc_word[1]); 735 DO64(drr_end.drr_checksum.zc_word[2]); 736 DO64(drr_end.drr_checksum.zc_word[3]); 737 break; 738 } 739 #undef DO64 740 #undef DO32 741 } 742 743 static int 744 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) 745 { 746 int err; 747 dmu_tx_t *tx; 748 void *data = NULL; 749 750 if (drro->drr_type == DMU_OT_NONE || 751 drro->drr_type >= DMU_OT_NUMTYPES || 752 drro->drr_bonustype >= DMU_OT_NUMTYPES || 753 drro->drr_checksum >= ZIO_CHECKSUM_FUNCTIONS || 754 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 755 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 756 drro->drr_blksz < SPA_MINBLOCKSIZE || 757 drro->drr_blksz > SPA_MAXBLOCKSIZE || 758 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 759 return (EINVAL); 760 } 761 762 err = dmu_object_info(os, drro->drr_object, NULL); 763 764 if (err != 0 && err != ENOENT) 765 return (EINVAL); 766 767 if (drro->drr_bonuslen) { 768 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8)); 769 if (ra->err) 770 return (ra->err); 771 } 772 773 if (err == ENOENT) { 774 /* currently free, want to be allocated */ 775 tx = dmu_tx_create(os); 776 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 777 err = dmu_tx_assign(tx, TXG_WAIT); 778 if (err) { 779 dmu_tx_abort(tx); 780 return (err); 781 } 782 err = dmu_object_claim(os, drro->drr_object, 783 drro->drr_type, drro->drr_blksz, 784 drro->drr_bonustype, drro->drr_bonuslen, tx); 785 dmu_tx_commit(tx); 786 } else { 787 /* currently allocated, want to be allocated */ 788 err = dmu_object_reclaim(os, drro->drr_object, 789 drro->drr_type, drro->drr_blksz, 790 drro->drr_bonustype, drro->drr_bonuslen); 791 } 792 if (err) 793 return (EINVAL); 794 795 tx = dmu_tx_create(os); 796 dmu_tx_hold_bonus(tx, drro->drr_object); 797 err = dmu_tx_assign(tx, TXG_WAIT); 798 if (err) { 799 dmu_tx_abort(tx); 800 return (err); 801 } 802 803 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksum, tx); 804 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); 805 806 if (data != NULL) { 807 dmu_buf_t *db; 808 809 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); 810 dmu_buf_will_dirty(db, tx); 811 812 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 813 bcopy(data, db->db_data, drro->drr_bonuslen); 814 if (ra->byteswap) { 815 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data, 816 drro->drr_bonuslen); 817 } 818 dmu_buf_rele(db, FTAG); 819 } 820 dmu_tx_commit(tx); 821 return (0); 822 } 823 824 /* ARGSUSED */ 825 static int 826 restore_freeobjects(struct restorearg *ra, objset_t *os, 827 struct drr_freeobjects *drrfo) 828 { 829 uint64_t obj; 830 831 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 832 return (EINVAL); 833 834 for (obj = drrfo->drr_firstobj; 835 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 836 (void) dmu_object_next(os, &obj, FALSE, 0)) { 837 int err; 838 839 if (dmu_object_info(os, obj, NULL) != 0) 840 continue; 841 842 err = dmu_free_object(os, obj); 843 if (err) 844 return (err); 845 } 846 return (0); 847 } 848 849 static int 850 restore_write(struct restorearg *ra, objset_t *os, 851 struct drr_write *drrw) 852 { 853 dmu_tx_t *tx; 854 void *data; 855 int err; 856 857 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 858 drrw->drr_type >= DMU_OT_NUMTYPES) 859 return (EINVAL); 860 861 data = restore_read(ra, drrw->drr_length); 862 if (data == NULL) 863 return (ra->err); 864 865 if (dmu_object_info(os, drrw->drr_object, NULL) != 0) 866 return (EINVAL); 867 868 tx = dmu_tx_create(os); 869 870 dmu_tx_hold_write(tx, drrw->drr_object, 871 drrw->drr_offset, drrw->drr_length); 872 err = dmu_tx_assign(tx, TXG_WAIT); 873 if (err) { 874 dmu_tx_abort(tx); 875 return (err); 876 } 877 if (ra->byteswap) 878 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length); 879 dmu_write(os, drrw->drr_object, 880 drrw->drr_offset, drrw->drr_length, data, tx); 881 dmu_tx_commit(tx); 882 return (0); 883 } 884 885 /* ARGSUSED */ 886 static int 887 restore_free(struct restorearg *ra, objset_t *os, 888 struct drr_free *drrf) 889 { 890 int err; 891 892 if (drrf->drr_length != -1ULL && 893 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 894 return (EINVAL); 895 896 if (dmu_object_info(os, drrf->drr_object, NULL) != 0) 897 return (EINVAL); 898 899 err = dmu_free_long_range(os, drrf->drr_object, 900 drrf->drr_offset, drrf->drr_length); 901 return (err); 902 } 903 904 /* 905 * NB: callers *must* call dmu_recv_end() if this succeeds. 906 */ 907 int 908 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp) 909 { 910 struct restorearg ra = { 0 }; 911 dmu_replay_record_t *drr; 912 objset_t *os; 913 zio_cksum_t pcksum; 914 915 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 916 ra.byteswap = TRUE; 917 918 { 919 /* compute checksum of drr_begin record */ 920 dmu_replay_record_t *drr; 921 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 922 923 drr->drr_type = DRR_BEGIN; 924 drr->drr_u.drr_begin = *drc->drc_drrb; 925 if (ra.byteswap) { 926 fletcher_4_incremental_byteswap(drr, 927 sizeof (dmu_replay_record_t), &ra.cksum); 928 } else { 929 fletcher_4_incremental_native(drr, 930 sizeof (dmu_replay_record_t), &ra.cksum); 931 } 932 kmem_free(drr, sizeof (dmu_replay_record_t)); 933 } 934 935 if (ra.byteswap) { 936 struct drr_begin *drrb = drc->drc_drrb; 937 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 938 drrb->drr_version = BSWAP_64(drrb->drr_version); 939 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 940 drrb->drr_type = BSWAP_32(drrb->drr_type); 941 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 942 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 943 } 944 945 ra.vp = vp; 946 ra.voff = *voffp; 947 ra.bufsize = 1<<20; 948 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); 949 950 /* these were verified in dmu_recv_begin */ 951 ASSERT(drc->drc_drrb->drr_version == DMU_BACKUP_STREAM_VERSION); 952 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES); 953 954 /* 955 * Open the objset we are modifying. 956 */ 957 VERIFY(dmu_objset_open_ds(drc->drc_real_ds, DMU_OST_ANY, &os) == 0); 958 959 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT); 960 961 /* 962 * Read records and process them. 963 */ 964 pcksum = ra.cksum; 965 while (ra.err == 0 && 966 NULL != (drr = restore_read(&ra, sizeof (*drr)))) { 967 if (issig(JUSTLOOKING) && issig(FORREAL)) { 968 ra.err = EINTR; 969 goto out; 970 } 971 972 if (ra.byteswap) 973 backup_byteswap(drr); 974 975 switch (drr->drr_type) { 976 case DRR_OBJECT: 977 { 978 /* 979 * We need to make a copy of the record header, 980 * because restore_{object,write} may need to 981 * restore_read(), which will invalidate drr. 982 */ 983 struct drr_object drro = drr->drr_u.drr_object; 984 ra.err = restore_object(&ra, os, &drro); 985 break; 986 } 987 case DRR_FREEOBJECTS: 988 { 989 struct drr_freeobjects drrfo = 990 drr->drr_u.drr_freeobjects; 991 ra.err = restore_freeobjects(&ra, os, &drrfo); 992 break; 993 } 994 case DRR_WRITE: 995 { 996 struct drr_write drrw = drr->drr_u.drr_write; 997 ra.err = restore_write(&ra, os, &drrw); 998 break; 999 } 1000 case DRR_FREE: 1001 { 1002 struct drr_free drrf = drr->drr_u.drr_free; 1003 ra.err = restore_free(&ra, os, &drrf); 1004 break; 1005 } 1006 case DRR_END: 1007 { 1008 struct drr_end drre = drr->drr_u.drr_end; 1009 /* 1010 * We compare against the *previous* checksum 1011 * value, because the stored checksum is of 1012 * everything before the DRR_END record. 1013 */ 1014 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum)) 1015 ra.err = ECKSUM; 1016 goto out; 1017 } 1018 default: 1019 ra.err = EINVAL; 1020 goto out; 1021 } 1022 pcksum = ra.cksum; 1023 } 1024 ASSERT(ra.err != 0); 1025 1026 out: 1027 dmu_objset_close(os); 1028 1029 if (ra.err != 0) { 1030 /* 1031 * destroy what we created, so we don't leave it in the 1032 * inconsistent restoring state. 1033 */ 1034 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0); 1035 1036 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, 1037 B_FALSE); 1038 if (drc->drc_real_ds != drc->drc_logical_ds) { 1039 mutex_exit(&drc->drc_logical_ds->ds_recvlock); 1040 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag); 1041 } 1042 } 1043 1044 kmem_free(ra.buf, ra.bufsize); 1045 *voffp = ra.voff; 1046 return (ra.err); 1047 } 1048 1049 struct recvendsyncarg { 1050 char *tosnap; 1051 uint64_t creation_time; 1052 uint64_t toguid; 1053 }; 1054 1055 static int 1056 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx) 1057 { 1058 dsl_dataset_t *ds = arg1; 1059 struct recvendsyncarg *resa = arg2; 1060 1061 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx)); 1062 } 1063 1064 static void 1065 recv_end_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 1066 { 1067 dsl_dataset_t *ds = arg1; 1068 struct recvendsyncarg *resa = arg2; 1069 1070 dsl_dataset_snapshot_sync(ds, resa->tosnap, cr, tx); 1071 1072 /* set snapshot's creation time and guid */ 1073 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1074 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time; 1075 ds->ds_prev->ds_phys->ds_guid = resa->toguid; 1076 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1077 1078 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1079 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1080 } 1081 1082 int 1083 dmu_recv_end(dmu_recv_cookie_t *drc) 1084 { 1085 struct recvendsyncarg resa; 1086 dsl_dataset_t *ds = drc->drc_logical_ds; 1087 int err; 1088 1089 /* 1090 * XXX hack; seems the ds is still dirty and 1091 * dsl_pool_zil_clean() expects it to have a ds_user_ptr 1092 * (and zil), but clone_swap() can close it. 1093 */ 1094 txg_wait_synced(ds->ds_dir->dd_pool, 0); 1095 1096 if (ds != drc->drc_real_ds) { 1097 /* we are doing an online recv */ 1098 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) { 1099 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds, 1100 drc->drc_force); 1101 if (err) 1102 dsl_dataset_disown(ds, dmu_recv_tag); 1103 } else { 1104 err = EBUSY; 1105 dsl_dataset_rele(ds, dmu_recv_tag); 1106 } 1107 /* dsl_dataset_destroy() will disown the ds */ 1108 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, 1109 B_FALSE); 1110 mutex_exit(&drc->drc_logical_ds->ds_recvlock); 1111 if (err) 1112 return (err); 1113 } 1114 1115 resa.creation_time = drc->drc_drrb->drr_creation_time; 1116 resa.toguid = drc->drc_drrb->drr_toguid; 1117 resa.tosnap = drc->drc_tosnap; 1118 1119 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 1120 recv_end_check, recv_end_sync, ds, &resa, 3); 1121 if (err) { 1122 if (drc->drc_newfs) { 1123 ASSERT(ds == drc->drc_real_ds); 1124 (void) dsl_dataset_destroy(ds, dmu_recv_tag, 1125 B_FALSE); 1126 return (err); 1127 } else { 1128 (void) dsl_dataset_rollback(ds, DMU_OST_NONE); 1129 } 1130 } 1131 1132 /* release the hold from dmu_recv_begin */ 1133 dsl_dataset_disown(ds, dmu_recv_tag); 1134 return (err); 1135 } 1136