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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 */ 24 /* 25 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 26 */ 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_prop.h> 39 #include <sys/dsl_pool.h> 40 #include <sys/dsl_synctask.h> 41 #include <sys/zfs_ioctl.h> 42 #include <sys/zap.h> 43 #include <sys/zio_checksum.h> 44 #include <sys/zfs_znode.h> 45 #include <zfs_fletcher.h> 46 #include <sys/avl.h> 47 #include <sys/ddt.h> 48 #include <sys/zfs_onexit.h> 49 50 static char *dmu_recv_tag = "dmu_recv_tag"; 51 52 /* 53 * The list of data whose inclusion in a send stream can be pending from 54 * one call to backup_cb to another. Multiple calls to dump_free() and 55 * dump_freeobjects() can be aggregated into a single DRR_FREE or 56 * DRR_FREEOBJECTS replay record. 57 */ 58 typedef enum { 59 PENDING_NONE, 60 PENDING_FREE, 61 PENDING_FREEOBJECTS 62 } pendop_t; 63 64 struct backuparg { 65 dmu_replay_record_t *drr; 66 vnode_t *vp; 67 offset_t *off; 68 objset_t *os; 69 zio_cksum_t zc; 70 uint64_t toguid; 71 int err; 72 pendop_t pending_op; 73 }; 74 75 static int 76 dump_bytes(struct backuparg *ba, void *buf, int len) 77 { 78 ssize_t resid; /* have to get resid to get detailed errno */ 79 ASSERT3U(len % 8, ==, 0); 80 81 fletcher_4_incremental_native(buf, len, &ba->zc); 82 ba->err = vn_rdwr(UIO_WRITE, ba->vp, 83 (caddr_t)buf, len, 84 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid); 85 *ba->off += len; 86 return (ba->err); 87 } 88 89 static int 90 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset, 91 uint64_t length) 92 { 93 struct drr_free *drrf = &(ba->drr->drr_u.drr_free); 94 95 /* 96 * If there is a pending op, but it's not PENDING_FREE, push it out, 97 * since free block aggregation can only be done for blocks of the 98 * same type (i.e., DRR_FREE records can only be aggregated with 99 * other DRR_FREE records. DRR_FREEOBJECTS records can only be 100 * aggregated with other DRR_FREEOBJECTS records. 101 */ 102 if (ba->pending_op != PENDING_NONE && ba->pending_op != PENDING_FREE) { 103 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 104 return (EINTR); 105 ba->pending_op = PENDING_NONE; 106 } 107 108 if (ba->pending_op == PENDING_FREE) { 109 /* 110 * There should never be a PENDING_FREE if length is -1 111 * (because dump_dnode is the only place where this 112 * function is called with a -1, and only after flushing 113 * any pending record). 114 */ 115 ASSERT(length != -1ULL); 116 /* 117 * Check to see whether this free block can be aggregated 118 * with pending one. 119 */ 120 if (drrf->drr_object == object && drrf->drr_offset + 121 drrf->drr_length == offset) { 122 drrf->drr_length += length; 123 return (0); 124 } else { 125 /* not a continuation. Push out pending record */ 126 if (dump_bytes(ba, ba->drr, 127 sizeof (dmu_replay_record_t)) != 0) 128 return (EINTR); 129 ba->pending_op = PENDING_NONE; 130 } 131 } 132 /* create a FREE record and make it pending */ 133 bzero(ba->drr, sizeof (dmu_replay_record_t)); 134 ba->drr->drr_type = DRR_FREE; 135 drrf->drr_object = object; 136 drrf->drr_offset = offset; 137 drrf->drr_length = length; 138 drrf->drr_toguid = ba->toguid; 139 if (length == -1ULL) { 140 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 141 return (EINTR); 142 } else { 143 ba->pending_op = PENDING_FREE; 144 } 145 146 return (0); 147 } 148 149 static int 150 dump_data(struct backuparg *ba, dmu_object_type_t type, 151 uint64_t object, uint64_t offset, int blksz, const blkptr_t *bp, void *data) 152 { 153 struct drr_write *drrw = &(ba->drr->drr_u.drr_write); 154 155 156 /* 157 * If there is any kind of pending aggregation (currently either 158 * a grouping of free objects or free blocks), push it out to 159 * the stream, since aggregation can't be done across operations 160 * of different types. 161 */ 162 if (ba->pending_op != PENDING_NONE) { 163 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 164 return (EINTR); 165 ba->pending_op = PENDING_NONE; 166 } 167 /* write a DATA record */ 168 bzero(ba->drr, sizeof (dmu_replay_record_t)); 169 ba->drr->drr_type = DRR_WRITE; 170 drrw->drr_object = object; 171 drrw->drr_type = type; 172 drrw->drr_offset = offset; 173 drrw->drr_length = blksz; 174 drrw->drr_toguid = ba->toguid; 175 drrw->drr_checksumtype = BP_GET_CHECKSUM(bp); 176 if (zio_checksum_table[drrw->drr_checksumtype].ci_dedup) 177 drrw->drr_checksumflags |= DRR_CHECKSUM_DEDUP; 178 DDK_SET_LSIZE(&drrw->drr_key, BP_GET_LSIZE(bp)); 179 DDK_SET_PSIZE(&drrw->drr_key, BP_GET_PSIZE(bp)); 180 DDK_SET_COMPRESS(&drrw->drr_key, BP_GET_COMPRESS(bp)); 181 drrw->drr_key.ddk_cksum = bp->blk_cksum; 182 183 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 184 return (EINTR); 185 if (dump_bytes(ba, data, blksz) != 0) 186 return (EINTR); 187 return (0); 188 } 189 190 static int 191 dump_spill(struct backuparg *ba, uint64_t object, int blksz, void *data) 192 { 193 struct drr_spill *drrs = &(ba->drr->drr_u.drr_spill); 194 195 if (ba->pending_op != PENDING_NONE) { 196 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 197 return (EINTR); 198 ba->pending_op = PENDING_NONE; 199 } 200 201 /* write a SPILL record */ 202 bzero(ba->drr, sizeof (dmu_replay_record_t)); 203 ba->drr->drr_type = DRR_SPILL; 204 drrs->drr_object = object; 205 drrs->drr_length = blksz; 206 drrs->drr_toguid = ba->toguid; 207 208 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 209 return (EINTR); 210 if (dump_bytes(ba, data, blksz)) 211 return (EINTR); 212 return (0); 213 } 214 215 static int 216 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs) 217 { 218 struct drr_freeobjects *drrfo = &(ba->drr->drr_u.drr_freeobjects); 219 220 /* 221 * If there is a pending op, but it's not PENDING_FREEOBJECTS, 222 * push it out, since free block aggregation can only be done for 223 * blocks of the same type (i.e., DRR_FREE records can only be 224 * aggregated with other DRR_FREE records. DRR_FREEOBJECTS records 225 * can only be aggregated with other DRR_FREEOBJECTS records. 226 */ 227 if (ba->pending_op != PENDING_NONE && 228 ba->pending_op != PENDING_FREEOBJECTS) { 229 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 230 return (EINTR); 231 ba->pending_op = PENDING_NONE; 232 } 233 if (ba->pending_op == PENDING_FREEOBJECTS) { 234 /* 235 * See whether this free object array can be aggregated 236 * with pending one 237 */ 238 if (drrfo->drr_firstobj + drrfo->drr_numobjs == firstobj) { 239 drrfo->drr_numobjs += numobjs; 240 return (0); 241 } else { 242 /* can't be aggregated. Push out pending record */ 243 if (dump_bytes(ba, ba->drr, 244 sizeof (dmu_replay_record_t)) != 0) 245 return (EINTR); 246 ba->pending_op = PENDING_NONE; 247 } 248 } 249 250 /* write a FREEOBJECTS record */ 251 bzero(ba->drr, sizeof (dmu_replay_record_t)); 252 ba->drr->drr_type = DRR_FREEOBJECTS; 253 drrfo->drr_firstobj = firstobj; 254 drrfo->drr_numobjs = numobjs; 255 drrfo->drr_toguid = ba->toguid; 256 257 ba->pending_op = PENDING_FREEOBJECTS; 258 259 return (0); 260 } 261 262 static int 263 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp) 264 { 265 struct drr_object *drro = &(ba->drr->drr_u.drr_object); 266 267 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) 268 return (dump_freeobjects(ba, object, 1)); 269 270 if (ba->pending_op != PENDING_NONE) { 271 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 272 return (EINTR); 273 ba->pending_op = PENDING_NONE; 274 } 275 276 /* write an OBJECT record */ 277 bzero(ba->drr, sizeof (dmu_replay_record_t)); 278 ba->drr->drr_type = DRR_OBJECT; 279 drro->drr_object = object; 280 drro->drr_type = dnp->dn_type; 281 drro->drr_bonustype = dnp->dn_bonustype; 282 drro->drr_blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 283 drro->drr_bonuslen = dnp->dn_bonuslen; 284 drro->drr_checksumtype = dnp->dn_checksum; 285 drro->drr_compress = dnp->dn_compress; 286 drro->drr_toguid = ba->toguid; 287 288 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t)) != 0) 289 return (EINTR); 290 291 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8)) != 0) 292 return (EINTR); 293 294 /* free anything past the end of the file */ 295 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) * 296 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL)) 297 return (EINTR); 298 if (ba->err) 299 return (EINTR); 300 return (0); 301 } 302 303 #define BP_SPAN(dnp, level) \ 304 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \ 305 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) 306 307 /* ARGSUSED */ 308 static int 309 backup_cb(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf, 310 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) 311 { 312 struct backuparg *ba = arg; 313 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; 314 int err = 0; 315 316 if (issig(JUSTLOOKING) && issig(FORREAL)) 317 return (EINTR); 318 319 if (zb->zb_object != DMU_META_DNODE_OBJECT && 320 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) { 321 return (0); 322 } else if (bp == NULL && zb->zb_object == DMU_META_DNODE_OBJECT) { 323 uint64_t span = BP_SPAN(dnp, zb->zb_level); 324 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT; 325 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT); 326 } else if (bp == NULL) { 327 uint64_t span = BP_SPAN(dnp, zb->zb_level); 328 err = dump_free(ba, zb->zb_object, zb->zb_blkid * span, span); 329 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) { 330 return (0); 331 } else if (type == DMU_OT_DNODE) { 332 dnode_phys_t *blk; 333 int i; 334 int blksz = BP_GET_LSIZE(bp); 335 uint32_t aflags = ARC_WAIT; 336 arc_buf_t *abuf; 337 338 if (dsl_read(NULL, spa, bp, pbuf, 339 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ, 340 ZIO_FLAG_CANFAIL, &aflags, zb) != 0) 341 return (EIO); 342 343 blk = abuf->b_data; 344 for (i = 0; i < blksz >> DNODE_SHIFT; i++) { 345 uint64_t dnobj = (zb->zb_blkid << 346 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i; 347 err = dump_dnode(ba, dnobj, blk+i); 348 if (err) 349 break; 350 } 351 (void) arc_buf_remove_ref(abuf, &abuf); 352 } else if (type == DMU_OT_SA) { 353 uint32_t aflags = ARC_WAIT; 354 arc_buf_t *abuf; 355 int blksz = BP_GET_LSIZE(bp); 356 357 if (arc_read_nolock(NULL, spa, bp, 358 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ, 359 ZIO_FLAG_CANFAIL, &aflags, zb) != 0) 360 return (EIO); 361 362 err = dump_spill(ba, zb->zb_object, blksz, abuf->b_data); 363 (void) arc_buf_remove_ref(abuf, &abuf); 364 } else { /* it's a level-0 block of a regular object */ 365 uint32_t aflags = ARC_WAIT; 366 arc_buf_t *abuf; 367 int blksz = BP_GET_LSIZE(bp); 368 369 if (dsl_read(NULL, spa, bp, pbuf, 370 arc_getbuf_func, &abuf, ZIO_PRIORITY_ASYNC_READ, 371 ZIO_FLAG_CANFAIL, &aflags, zb) != 0) 372 return (EIO); 373 374 err = dump_data(ba, type, zb->zb_object, zb->zb_blkid * blksz, 375 blksz, bp, abuf->b_data); 376 (void) arc_buf_remove_ref(abuf, &abuf); 377 } 378 379 ASSERT(err == 0 || err == EINTR); 380 return (err); 381 } 382 383 int 384 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, boolean_t fromorigin, 385 vnode_t *vp, offset_t *off) 386 { 387 dsl_dataset_t *ds = tosnap->os_dsl_dataset; 388 dsl_dataset_t *fromds = fromsnap ? fromsnap->os_dsl_dataset : NULL; 389 dmu_replay_record_t *drr; 390 struct backuparg ba; 391 int err; 392 uint64_t fromtxg = 0; 393 394 /* tosnap must be a snapshot */ 395 if (ds->ds_phys->ds_next_snap_obj == 0) 396 return (EINVAL); 397 398 /* fromsnap must be an earlier snapshot from the same fs as tosnap */ 399 if (fromds && (ds->ds_dir != fromds->ds_dir || 400 fromds->ds_phys->ds_creation_txg >= ds->ds_phys->ds_creation_txg)) 401 return (EXDEV); 402 403 if (fromorigin) { 404 dsl_pool_t *dp = ds->ds_dir->dd_pool; 405 406 if (fromsnap) 407 return (EINVAL); 408 409 if (dsl_dir_is_clone(ds->ds_dir)) { 410 rw_enter(&dp->dp_config_rwlock, RW_READER); 411 err = dsl_dataset_hold_obj(dp, 412 ds->ds_dir->dd_phys->dd_origin_obj, FTAG, &fromds); 413 rw_exit(&dp->dp_config_rwlock); 414 if (err) 415 return (err); 416 } else { 417 fromorigin = B_FALSE; 418 } 419 } 420 421 422 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 423 drr->drr_type = DRR_BEGIN; 424 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 425 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo, 426 DMU_SUBSTREAM); 427 428 #ifdef _KERNEL 429 if (dmu_objset_type(tosnap) == DMU_OST_ZFS) { 430 uint64_t version; 431 if (zfs_get_zplprop(tosnap, ZFS_PROP_VERSION, &version) != 0) 432 return (EINVAL); 433 if (version == ZPL_VERSION_SA) { 434 DMU_SET_FEATUREFLAGS( 435 drr->drr_u.drr_begin.drr_versioninfo, 436 DMU_BACKUP_FEATURE_SA_SPILL); 437 } 438 } 439 #endif 440 441 drr->drr_u.drr_begin.drr_creation_time = 442 ds->ds_phys->ds_creation_time; 443 drr->drr_u.drr_begin.drr_type = tosnap->os_phys->os_type; 444 if (fromorigin) 445 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE; 446 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid; 447 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET) 448 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA; 449 450 if (fromds) 451 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid; 452 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname); 453 454 if (fromds) 455 fromtxg = fromds->ds_phys->ds_creation_txg; 456 if (fromorigin) 457 dsl_dataset_rele(fromds, FTAG); 458 459 ba.drr = drr; 460 ba.vp = vp; 461 ba.os = tosnap; 462 ba.off = off; 463 ba.toguid = ds->ds_phys->ds_guid; 464 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0); 465 ba.pending_op = PENDING_NONE; 466 467 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) { 468 kmem_free(drr, sizeof (dmu_replay_record_t)); 469 return (ba.err); 470 } 471 472 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH, 473 backup_cb, &ba); 474 475 if (ba.pending_op != PENDING_NONE) 476 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) 477 err = EINTR; 478 479 if (err) { 480 if (err == EINTR && ba.err) 481 err = ba.err; 482 kmem_free(drr, sizeof (dmu_replay_record_t)); 483 return (err); 484 } 485 486 bzero(drr, sizeof (dmu_replay_record_t)); 487 drr->drr_type = DRR_END; 488 drr->drr_u.drr_end.drr_checksum = ba.zc; 489 drr->drr_u.drr_end.drr_toguid = ba.toguid; 490 491 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t)) != 0) { 492 kmem_free(drr, sizeof (dmu_replay_record_t)); 493 return (ba.err); 494 } 495 496 kmem_free(drr, sizeof (dmu_replay_record_t)); 497 498 return (0); 499 } 500 501 struct recvbeginsyncarg { 502 const char *tofs; 503 const char *tosnap; 504 dsl_dataset_t *origin; 505 uint64_t fromguid; 506 dmu_objset_type_t type; 507 void *tag; 508 boolean_t force; 509 uint64_t dsflags; 510 char clonelastname[MAXNAMELEN]; 511 dsl_dataset_t *ds; /* the ds to recv into; returned from the syncfunc */ 512 cred_t *cr; 513 }; 514 515 /* ARGSUSED */ 516 static int 517 recv_new_check(void *arg1, void *arg2, dmu_tx_t *tx) 518 { 519 dsl_dir_t *dd = arg1; 520 struct recvbeginsyncarg *rbsa = arg2; 521 objset_t *mos = dd->dd_pool->dp_meta_objset; 522 uint64_t val; 523 int err; 524 525 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 526 strrchr(rbsa->tofs, '/') + 1, sizeof (uint64_t), 1, &val); 527 528 if (err != ENOENT) 529 return (err ? err : EEXIST); 530 531 if (rbsa->origin) { 532 /* make sure it's a snap in the same pool */ 533 if (rbsa->origin->ds_dir->dd_pool != dd->dd_pool) 534 return (EXDEV); 535 if (!dsl_dataset_is_snapshot(rbsa->origin)) 536 return (EINVAL); 537 if (rbsa->origin->ds_phys->ds_guid != rbsa->fromguid) 538 return (ENODEV); 539 } 540 541 return (0); 542 } 543 544 static void 545 recv_new_sync(void *arg1, void *arg2, dmu_tx_t *tx) 546 { 547 dsl_dir_t *dd = arg1; 548 struct recvbeginsyncarg *rbsa = arg2; 549 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags; 550 uint64_t dsobj; 551 552 /* Create and open new dataset. */ 553 dsobj = dsl_dataset_create_sync(dd, strrchr(rbsa->tofs, '/') + 1, 554 rbsa->origin, flags, rbsa->cr, tx); 555 VERIFY(0 == dsl_dataset_own_obj(dd->dd_pool, dsobj, 556 B_TRUE, dmu_recv_tag, &rbsa->ds)); 557 558 if (rbsa->origin == NULL) { 559 (void) dmu_objset_create_impl(dd->dd_pool->dp_spa, 560 rbsa->ds, &rbsa->ds->ds_phys->ds_bp, rbsa->type, tx); 561 } 562 563 spa_history_log_internal(LOG_DS_REPLAY_FULL_SYNC, 564 dd->dd_pool->dp_spa, tx, "dataset = %lld", dsobj); 565 } 566 567 /* ARGSUSED */ 568 static int 569 recv_existing_check(void *arg1, void *arg2, dmu_tx_t *tx) 570 { 571 dsl_dataset_t *ds = arg1; 572 struct recvbeginsyncarg *rbsa = arg2; 573 int err; 574 uint64_t val; 575 576 /* must not have any changes since most recent snapshot */ 577 if (!rbsa->force && dsl_dataset_modified_since_lastsnap(ds)) 578 return (ETXTBSY); 579 580 /* new snapshot name must not exist */ 581 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 582 ds->ds_phys->ds_snapnames_zapobj, rbsa->tosnap, 8, 1, &val); 583 if (err == 0) 584 return (EEXIST); 585 if (err != ENOENT) 586 return (err); 587 588 if (rbsa->fromguid) { 589 /* if incremental, most recent snapshot must match fromguid */ 590 if (ds->ds_prev == NULL) 591 return (ENODEV); 592 593 /* 594 * most recent snapshot must match fromguid, or there are no 595 * changes since the fromguid one 596 */ 597 if (ds->ds_prev->ds_phys->ds_guid != rbsa->fromguid) { 598 uint64_t birth = ds->ds_prev->ds_phys->ds_bp.blk_birth; 599 uint64_t obj = ds->ds_prev->ds_phys->ds_prev_snap_obj; 600 while (obj != 0) { 601 dsl_dataset_t *snap; 602 err = dsl_dataset_hold_obj(ds->ds_dir->dd_pool, 603 obj, FTAG, &snap); 604 if (err) 605 return (ENODEV); 606 if (snap->ds_phys->ds_creation_txg < birth) { 607 dsl_dataset_rele(snap, FTAG); 608 return (ENODEV); 609 } 610 if (snap->ds_phys->ds_guid == rbsa->fromguid) { 611 dsl_dataset_rele(snap, FTAG); 612 break; /* it's ok */ 613 } 614 obj = snap->ds_phys->ds_prev_snap_obj; 615 dsl_dataset_rele(snap, FTAG); 616 } 617 if (obj == 0) 618 return (ENODEV); 619 } 620 } else { 621 /* if full, most recent snapshot must be $ORIGIN */ 622 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL) 623 return (ENODEV); 624 } 625 626 /* temporary clone name must not exist */ 627 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 628 ds->ds_dir->dd_phys->dd_child_dir_zapobj, 629 rbsa->clonelastname, 8, 1, &val); 630 if (err == 0) 631 return (EEXIST); 632 if (err != ENOENT) 633 return (err); 634 635 return (0); 636 } 637 638 /* ARGSUSED */ 639 static void 640 recv_existing_sync(void *arg1, void *arg2, dmu_tx_t *tx) 641 { 642 dsl_dataset_t *ohds = arg1; 643 struct recvbeginsyncarg *rbsa = arg2; 644 dsl_pool_t *dp = ohds->ds_dir->dd_pool; 645 dsl_dataset_t *cds; 646 uint64_t flags = DS_FLAG_INCONSISTENT | rbsa->dsflags; 647 uint64_t dsobj; 648 649 /* create and open the temporary clone */ 650 dsobj = dsl_dataset_create_sync(ohds->ds_dir, rbsa->clonelastname, 651 ohds->ds_prev, flags, rbsa->cr, tx); 652 VERIFY(0 == dsl_dataset_own_obj(dp, dsobj, B_TRUE, dmu_recv_tag, &cds)); 653 654 /* 655 * If we actually created a non-clone, we need to create the 656 * objset in our new dataset. 657 */ 658 if (BP_IS_HOLE(dsl_dataset_get_blkptr(cds))) { 659 (void) dmu_objset_create_impl(dp->dp_spa, 660 cds, dsl_dataset_get_blkptr(cds), rbsa->type, tx); 661 } 662 663 rbsa->ds = cds; 664 665 spa_history_log_internal(LOG_DS_REPLAY_INC_SYNC, 666 dp->dp_spa, tx, "dataset = %lld", dsobj); 667 } 668 669 static boolean_t 670 dmu_recv_verify_features(dsl_dataset_t *ds, struct drr_begin *drrb) 671 { 672 int featureflags; 673 674 featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo); 675 676 /* Verify pool version supports SA if SA_SPILL feature set */ 677 return ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) && 678 (spa_version(dsl_dataset_get_spa(ds)) < SPA_VERSION_SA)); 679 } 680 681 /* 682 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin() 683 * succeeds; otherwise we will leak the holds on the datasets. 684 */ 685 int 686 dmu_recv_begin(char *tofs, char *tosnap, char *top_ds, struct drr_begin *drrb, 687 boolean_t force, objset_t *origin, dmu_recv_cookie_t *drc) 688 { 689 int err = 0; 690 boolean_t byteswap; 691 struct recvbeginsyncarg rbsa = { 0 }; 692 uint64_t versioninfo; 693 int flags; 694 dsl_dataset_t *ds; 695 696 if (drrb->drr_magic == DMU_BACKUP_MAGIC) 697 byteswap = FALSE; 698 else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 699 byteswap = TRUE; 700 else 701 return (EINVAL); 702 703 rbsa.tofs = tofs; 704 rbsa.tosnap = tosnap; 705 rbsa.origin = origin ? origin->os_dsl_dataset : NULL; 706 rbsa.fromguid = drrb->drr_fromguid; 707 rbsa.type = drrb->drr_type; 708 rbsa.tag = FTAG; 709 rbsa.dsflags = 0; 710 rbsa.cr = CRED(); 711 versioninfo = drrb->drr_versioninfo; 712 flags = drrb->drr_flags; 713 714 if (byteswap) { 715 rbsa.type = BSWAP_32(rbsa.type); 716 rbsa.fromguid = BSWAP_64(rbsa.fromguid); 717 versioninfo = BSWAP_64(versioninfo); 718 flags = BSWAP_32(flags); 719 } 720 721 if (DMU_GET_STREAM_HDRTYPE(versioninfo) == DMU_COMPOUNDSTREAM || 722 rbsa.type >= DMU_OST_NUMTYPES || 723 ((flags & DRR_FLAG_CLONE) && origin == NULL)) 724 return (EINVAL); 725 726 if (flags & DRR_FLAG_CI_DATA) 727 rbsa.dsflags = DS_FLAG_CI_DATASET; 728 729 bzero(drc, sizeof (dmu_recv_cookie_t)); 730 drc->drc_drrb = drrb; 731 drc->drc_tosnap = tosnap; 732 drc->drc_top_ds = top_ds; 733 drc->drc_force = force; 734 735 /* 736 * Process the begin in syncing context. 737 */ 738 739 /* open the dataset we are logically receiving into */ 740 err = dsl_dataset_hold(tofs, dmu_recv_tag, &ds); 741 if (err == 0) { 742 if (dmu_recv_verify_features(ds, drrb)) { 743 dsl_dataset_rele(ds, dmu_recv_tag); 744 return (ENOTSUP); 745 } 746 /* target fs already exists; recv into temp clone */ 747 748 /* Can't recv a clone into an existing fs */ 749 if (flags & DRR_FLAG_CLONE) { 750 dsl_dataset_rele(ds, dmu_recv_tag); 751 return (EINVAL); 752 } 753 754 /* must not have an incremental recv already in progress */ 755 if (!mutex_tryenter(&ds->ds_recvlock)) { 756 dsl_dataset_rele(ds, dmu_recv_tag); 757 return (EBUSY); 758 } 759 760 /* tmp clone name is: tofs/%tosnap" */ 761 (void) snprintf(rbsa.clonelastname, sizeof (rbsa.clonelastname), 762 "%%%s", tosnap); 763 rbsa.force = force; 764 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 765 recv_existing_check, recv_existing_sync, ds, &rbsa, 5); 766 if (err) { 767 mutex_exit(&ds->ds_recvlock); 768 dsl_dataset_rele(ds, dmu_recv_tag); 769 return (err); 770 } 771 drc->drc_logical_ds = ds; 772 drc->drc_real_ds = rbsa.ds; 773 } else if (err == ENOENT) { 774 /* target fs does not exist; must be a full backup or clone */ 775 char *cp; 776 777 /* 778 * If it's a non-clone incremental, we are missing the 779 * target fs, so fail the recv. 780 */ 781 if (rbsa.fromguid && !(flags & DRR_FLAG_CLONE)) 782 return (ENOENT); 783 784 /* Open the parent of tofs */ 785 cp = strrchr(tofs, '/'); 786 *cp = '\0'; 787 err = dsl_dataset_hold(tofs, FTAG, &ds); 788 *cp = '/'; 789 if (err) 790 return (err); 791 792 if (dmu_recv_verify_features(ds, drrb)) { 793 dsl_dataset_rele(ds, FTAG); 794 return (ENOTSUP); 795 } 796 797 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 798 recv_new_check, recv_new_sync, ds->ds_dir, &rbsa, 5); 799 dsl_dataset_rele(ds, FTAG); 800 if (err) 801 return (err); 802 drc->drc_logical_ds = drc->drc_real_ds = rbsa.ds; 803 drc->drc_newfs = B_TRUE; 804 } 805 806 return (err); 807 } 808 809 struct restorearg { 810 int err; 811 int byteswap; 812 vnode_t *vp; 813 char *buf; 814 uint64_t voff; 815 int bufsize; /* amount of memory allocated for buf */ 816 zio_cksum_t cksum; 817 avl_tree_t *guid_to_ds_map; 818 }; 819 820 typedef struct guid_map_entry { 821 uint64_t guid; 822 dsl_dataset_t *gme_ds; 823 avl_node_t avlnode; 824 } guid_map_entry_t; 825 826 static int 827 guid_compare(const void *arg1, const void *arg2) 828 { 829 const guid_map_entry_t *gmep1 = arg1; 830 const guid_map_entry_t *gmep2 = arg2; 831 832 if (gmep1->guid < gmep2->guid) 833 return (-1); 834 else if (gmep1->guid > gmep2->guid) 835 return (1); 836 return (0); 837 } 838 839 static void 840 free_guid_map_onexit(void *arg) 841 { 842 avl_tree_t *ca = arg; 843 void *cookie = NULL; 844 guid_map_entry_t *gmep; 845 846 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) { 847 dsl_dataset_rele(gmep->gme_ds, ca); 848 kmem_free(gmep, sizeof (guid_map_entry_t)); 849 } 850 avl_destroy(ca); 851 kmem_free(ca, sizeof (avl_tree_t)); 852 } 853 854 static void * 855 restore_read(struct restorearg *ra, int len) 856 { 857 void *rv; 858 int done = 0; 859 860 /* some things will require 8-byte alignment, so everything must */ 861 ASSERT3U(len % 8, ==, 0); 862 863 while (done < len) { 864 ssize_t resid; 865 866 ra->err = vn_rdwr(UIO_READ, ra->vp, 867 (caddr_t)ra->buf + done, len - done, 868 ra->voff, UIO_SYSSPACE, FAPPEND, 869 RLIM64_INFINITY, CRED(), &resid); 870 871 if (resid == len - done) 872 ra->err = EINVAL; 873 ra->voff += len - done - resid; 874 done = len - resid; 875 if (ra->err) 876 return (NULL); 877 } 878 879 ASSERT3U(done, ==, len); 880 rv = ra->buf; 881 if (ra->byteswap) 882 fletcher_4_incremental_byteswap(rv, len, &ra->cksum); 883 else 884 fletcher_4_incremental_native(rv, len, &ra->cksum); 885 return (rv); 886 } 887 888 static void 889 backup_byteswap(dmu_replay_record_t *drr) 890 { 891 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 892 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 893 drr->drr_type = BSWAP_32(drr->drr_type); 894 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen); 895 switch (drr->drr_type) { 896 case DRR_BEGIN: 897 DO64(drr_begin.drr_magic); 898 DO64(drr_begin.drr_versioninfo); 899 DO64(drr_begin.drr_creation_time); 900 DO32(drr_begin.drr_type); 901 DO32(drr_begin.drr_flags); 902 DO64(drr_begin.drr_toguid); 903 DO64(drr_begin.drr_fromguid); 904 break; 905 case DRR_OBJECT: 906 DO64(drr_object.drr_object); 907 /* DO64(drr_object.drr_allocation_txg); */ 908 DO32(drr_object.drr_type); 909 DO32(drr_object.drr_bonustype); 910 DO32(drr_object.drr_blksz); 911 DO32(drr_object.drr_bonuslen); 912 DO64(drr_object.drr_toguid); 913 break; 914 case DRR_FREEOBJECTS: 915 DO64(drr_freeobjects.drr_firstobj); 916 DO64(drr_freeobjects.drr_numobjs); 917 DO64(drr_freeobjects.drr_toguid); 918 break; 919 case DRR_WRITE: 920 DO64(drr_write.drr_object); 921 DO32(drr_write.drr_type); 922 DO64(drr_write.drr_offset); 923 DO64(drr_write.drr_length); 924 DO64(drr_write.drr_toguid); 925 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]); 926 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]); 927 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]); 928 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]); 929 DO64(drr_write.drr_key.ddk_prop); 930 break; 931 case DRR_WRITE_BYREF: 932 DO64(drr_write_byref.drr_object); 933 DO64(drr_write_byref.drr_offset); 934 DO64(drr_write_byref.drr_length); 935 DO64(drr_write_byref.drr_toguid); 936 DO64(drr_write_byref.drr_refguid); 937 DO64(drr_write_byref.drr_refobject); 938 DO64(drr_write_byref.drr_refoffset); 939 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]); 940 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]); 941 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]); 942 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]); 943 DO64(drr_write_byref.drr_key.ddk_prop); 944 break; 945 case DRR_FREE: 946 DO64(drr_free.drr_object); 947 DO64(drr_free.drr_offset); 948 DO64(drr_free.drr_length); 949 DO64(drr_free.drr_toguid); 950 break; 951 case DRR_SPILL: 952 DO64(drr_spill.drr_object); 953 DO64(drr_spill.drr_length); 954 DO64(drr_spill.drr_toguid); 955 break; 956 case DRR_END: 957 DO64(drr_end.drr_checksum.zc_word[0]); 958 DO64(drr_end.drr_checksum.zc_word[1]); 959 DO64(drr_end.drr_checksum.zc_word[2]); 960 DO64(drr_end.drr_checksum.zc_word[3]); 961 DO64(drr_end.drr_toguid); 962 break; 963 } 964 #undef DO64 965 #undef DO32 966 } 967 968 static int 969 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) 970 { 971 int err; 972 dmu_tx_t *tx; 973 void *data = NULL; 974 975 if (drro->drr_type == DMU_OT_NONE || 976 drro->drr_type >= DMU_OT_NUMTYPES || 977 drro->drr_bonustype >= DMU_OT_NUMTYPES || 978 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS || 979 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 980 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 981 drro->drr_blksz < SPA_MINBLOCKSIZE || 982 drro->drr_blksz > SPA_MAXBLOCKSIZE || 983 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 984 return (EINVAL); 985 } 986 987 err = dmu_object_info(os, drro->drr_object, NULL); 988 989 if (err != 0 && err != ENOENT) 990 return (EINVAL); 991 992 if (drro->drr_bonuslen) { 993 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8)); 994 if (ra->err) 995 return (ra->err); 996 } 997 998 if (err == ENOENT) { 999 /* currently free, want to be allocated */ 1000 tx = dmu_tx_create(os); 1001 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 1002 err = dmu_tx_assign(tx, TXG_WAIT); 1003 if (err) { 1004 dmu_tx_abort(tx); 1005 return (err); 1006 } 1007 err = dmu_object_claim(os, drro->drr_object, 1008 drro->drr_type, drro->drr_blksz, 1009 drro->drr_bonustype, drro->drr_bonuslen, tx); 1010 dmu_tx_commit(tx); 1011 } else { 1012 /* currently allocated, want to be allocated */ 1013 err = dmu_object_reclaim(os, drro->drr_object, 1014 drro->drr_type, drro->drr_blksz, 1015 drro->drr_bonustype, drro->drr_bonuslen); 1016 } 1017 if (err) { 1018 return (EINVAL); 1019 } 1020 1021 tx = dmu_tx_create(os); 1022 dmu_tx_hold_bonus(tx, drro->drr_object); 1023 err = dmu_tx_assign(tx, TXG_WAIT); 1024 if (err) { 1025 dmu_tx_abort(tx); 1026 return (err); 1027 } 1028 1029 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype, 1030 tx); 1031 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); 1032 1033 if (data != NULL) { 1034 dmu_buf_t *db; 1035 1036 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); 1037 dmu_buf_will_dirty(db, tx); 1038 1039 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 1040 bcopy(data, db->db_data, drro->drr_bonuslen); 1041 if (ra->byteswap) { 1042 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data, 1043 drro->drr_bonuslen); 1044 } 1045 dmu_buf_rele(db, FTAG); 1046 } 1047 dmu_tx_commit(tx); 1048 return (0); 1049 } 1050 1051 /* ARGSUSED */ 1052 static int 1053 restore_freeobjects(struct restorearg *ra, objset_t *os, 1054 struct drr_freeobjects *drrfo) 1055 { 1056 uint64_t obj; 1057 1058 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 1059 return (EINVAL); 1060 1061 for (obj = drrfo->drr_firstobj; 1062 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 1063 (void) dmu_object_next(os, &obj, FALSE, 0)) { 1064 int err; 1065 1066 if (dmu_object_info(os, obj, NULL) != 0) 1067 continue; 1068 1069 err = dmu_free_object(os, obj); 1070 if (err) 1071 return (err); 1072 } 1073 return (0); 1074 } 1075 1076 static int 1077 restore_write(struct restorearg *ra, objset_t *os, 1078 struct drr_write *drrw) 1079 { 1080 dmu_tx_t *tx; 1081 void *data; 1082 int err; 1083 1084 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 1085 drrw->drr_type >= DMU_OT_NUMTYPES) 1086 return (EINVAL); 1087 1088 data = restore_read(ra, drrw->drr_length); 1089 if (data == NULL) 1090 return (ra->err); 1091 1092 if (dmu_object_info(os, drrw->drr_object, NULL) != 0) 1093 return (EINVAL); 1094 1095 tx = dmu_tx_create(os); 1096 1097 dmu_tx_hold_write(tx, drrw->drr_object, 1098 drrw->drr_offset, drrw->drr_length); 1099 err = dmu_tx_assign(tx, TXG_WAIT); 1100 if (err) { 1101 dmu_tx_abort(tx); 1102 return (err); 1103 } 1104 if (ra->byteswap) 1105 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length); 1106 dmu_write(os, drrw->drr_object, 1107 drrw->drr_offset, drrw->drr_length, data, tx); 1108 dmu_tx_commit(tx); 1109 return (0); 1110 } 1111 1112 /* 1113 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed 1114 * streams to refer to a copy of the data that is already on the 1115 * system because it came in earlier in the stream. This function 1116 * finds the earlier copy of the data, and uses that copy instead of 1117 * data from the stream to fulfill this write. 1118 */ 1119 static int 1120 restore_write_byref(struct restorearg *ra, objset_t *os, 1121 struct drr_write_byref *drrwbr) 1122 { 1123 dmu_tx_t *tx; 1124 int err; 1125 guid_map_entry_t gmesrch; 1126 guid_map_entry_t *gmep; 1127 avl_index_t where; 1128 objset_t *ref_os = NULL; 1129 dmu_buf_t *dbp; 1130 1131 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset) 1132 return (EINVAL); 1133 1134 /* 1135 * If the GUID of the referenced dataset is different from the 1136 * GUID of the target dataset, find the referenced dataset. 1137 */ 1138 if (drrwbr->drr_toguid != drrwbr->drr_refguid) { 1139 gmesrch.guid = drrwbr->drr_refguid; 1140 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch, 1141 &where)) == NULL) { 1142 return (EINVAL); 1143 } 1144 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os)) 1145 return (EINVAL); 1146 } else { 1147 ref_os = os; 1148 } 1149 1150 if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject, 1151 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH)) 1152 return (err); 1153 1154 tx = dmu_tx_create(os); 1155 1156 dmu_tx_hold_write(tx, drrwbr->drr_object, 1157 drrwbr->drr_offset, drrwbr->drr_length); 1158 err = dmu_tx_assign(tx, TXG_WAIT); 1159 if (err) { 1160 dmu_tx_abort(tx); 1161 return (err); 1162 } 1163 dmu_write(os, drrwbr->drr_object, 1164 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx); 1165 dmu_buf_rele(dbp, FTAG); 1166 dmu_tx_commit(tx); 1167 return (0); 1168 } 1169 1170 static int 1171 restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs) 1172 { 1173 dmu_tx_t *tx; 1174 void *data; 1175 dmu_buf_t *db, *db_spill; 1176 int err; 1177 1178 if (drrs->drr_length < SPA_MINBLOCKSIZE || 1179 drrs->drr_length > SPA_MAXBLOCKSIZE) 1180 return (EINVAL); 1181 1182 data = restore_read(ra, drrs->drr_length); 1183 if (data == NULL) 1184 return (ra->err); 1185 1186 if (dmu_object_info(os, drrs->drr_object, NULL) != 0) 1187 return (EINVAL); 1188 1189 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db)); 1190 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) { 1191 dmu_buf_rele(db, FTAG); 1192 return (err); 1193 } 1194 1195 tx = dmu_tx_create(os); 1196 1197 dmu_tx_hold_spill(tx, db->db_object); 1198 1199 err = dmu_tx_assign(tx, TXG_WAIT); 1200 if (err) { 1201 dmu_buf_rele(db, FTAG); 1202 dmu_buf_rele(db_spill, FTAG); 1203 dmu_tx_abort(tx); 1204 return (err); 1205 } 1206 dmu_buf_will_dirty(db_spill, tx); 1207 1208 if (db_spill->db_size < drrs->drr_length) 1209 VERIFY(0 == dbuf_spill_set_blksz(db_spill, 1210 drrs->drr_length, tx)); 1211 bcopy(data, db_spill->db_data, drrs->drr_length); 1212 1213 dmu_buf_rele(db, FTAG); 1214 dmu_buf_rele(db_spill, FTAG); 1215 1216 dmu_tx_commit(tx); 1217 return (0); 1218 } 1219 1220 /* ARGSUSED */ 1221 static int 1222 restore_free(struct restorearg *ra, objset_t *os, 1223 struct drr_free *drrf) 1224 { 1225 int err; 1226 1227 if (drrf->drr_length != -1ULL && 1228 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 1229 return (EINVAL); 1230 1231 if (dmu_object_info(os, drrf->drr_object, NULL) != 0) 1232 return (EINVAL); 1233 1234 err = dmu_free_long_range(os, drrf->drr_object, 1235 drrf->drr_offset, drrf->drr_length); 1236 return (err); 1237 } 1238 1239 /* 1240 * NB: callers *must* call dmu_recv_end() if this succeeds. 1241 */ 1242 int 1243 dmu_recv_stream(dmu_recv_cookie_t *drc, vnode_t *vp, offset_t *voffp, 1244 int cleanup_fd, uint64_t *action_handlep) 1245 { 1246 struct restorearg ra = { 0 }; 1247 dmu_replay_record_t *drr; 1248 objset_t *os; 1249 zio_cksum_t pcksum; 1250 int featureflags; 1251 1252 if (drc->drc_drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) 1253 ra.byteswap = TRUE; 1254 1255 { 1256 /* compute checksum of drr_begin record */ 1257 dmu_replay_record_t *drr; 1258 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 1259 1260 drr->drr_type = DRR_BEGIN; 1261 drr->drr_u.drr_begin = *drc->drc_drrb; 1262 if (ra.byteswap) { 1263 fletcher_4_incremental_byteswap(drr, 1264 sizeof (dmu_replay_record_t), &ra.cksum); 1265 } else { 1266 fletcher_4_incremental_native(drr, 1267 sizeof (dmu_replay_record_t), &ra.cksum); 1268 } 1269 kmem_free(drr, sizeof (dmu_replay_record_t)); 1270 } 1271 1272 if (ra.byteswap) { 1273 struct drr_begin *drrb = drc->drc_drrb; 1274 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 1275 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo); 1276 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 1277 drrb->drr_type = BSWAP_32(drrb->drr_type); 1278 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 1279 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 1280 } 1281 1282 ra.vp = vp; 1283 ra.voff = *voffp; 1284 ra.bufsize = 1<<20; 1285 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); 1286 1287 /* these were verified in dmu_recv_begin */ 1288 ASSERT(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo) == 1289 DMU_SUBSTREAM); 1290 ASSERT(drc->drc_drrb->drr_type < DMU_OST_NUMTYPES); 1291 1292 /* 1293 * Open the objset we are modifying. 1294 */ 1295 VERIFY(dmu_objset_from_ds(drc->drc_real_ds, &os) == 0); 1296 1297 ASSERT(drc->drc_real_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT); 1298 1299 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo); 1300 1301 /* if this stream is dedup'ed, set up the avl tree for guid mapping */ 1302 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) { 1303 minor_t minor; 1304 1305 if (cleanup_fd == -1) { 1306 ra.err = EBADF; 1307 goto out; 1308 } 1309 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor); 1310 if (ra.err) { 1311 cleanup_fd = -1; 1312 goto out; 1313 } 1314 1315 if (*action_handlep == 0) { 1316 ra.guid_to_ds_map = 1317 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP); 1318 avl_create(ra.guid_to_ds_map, guid_compare, 1319 sizeof (guid_map_entry_t), 1320 offsetof(guid_map_entry_t, avlnode)); 1321 ra.err = zfs_onexit_add_cb(minor, 1322 free_guid_map_onexit, ra.guid_to_ds_map, 1323 action_handlep); 1324 if (ra.err) 1325 goto out; 1326 } else { 1327 ra.err = zfs_onexit_cb_data(minor, *action_handlep, 1328 (void **)&ra.guid_to_ds_map); 1329 if (ra.err) 1330 goto out; 1331 } 1332 1333 drc->drc_guid_to_ds_map = ra.guid_to_ds_map; 1334 } 1335 1336 /* 1337 * Read records and process them. 1338 */ 1339 pcksum = ra.cksum; 1340 while (ra.err == 0 && 1341 NULL != (drr = restore_read(&ra, sizeof (*drr)))) { 1342 if (issig(JUSTLOOKING) && issig(FORREAL)) { 1343 ra.err = EINTR; 1344 goto out; 1345 } 1346 1347 if (ra.byteswap) 1348 backup_byteswap(drr); 1349 1350 switch (drr->drr_type) { 1351 case DRR_OBJECT: 1352 { 1353 /* 1354 * We need to make a copy of the record header, 1355 * because restore_{object,write} may need to 1356 * restore_read(), which will invalidate drr. 1357 */ 1358 struct drr_object drro = drr->drr_u.drr_object; 1359 ra.err = restore_object(&ra, os, &drro); 1360 break; 1361 } 1362 case DRR_FREEOBJECTS: 1363 { 1364 struct drr_freeobjects drrfo = 1365 drr->drr_u.drr_freeobjects; 1366 ra.err = restore_freeobjects(&ra, os, &drrfo); 1367 break; 1368 } 1369 case DRR_WRITE: 1370 { 1371 struct drr_write drrw = drr->drr_u.drr_write; 1372 ra.err = restore_write(&ra, os, &drrw); 1373 break; 1374 } 1375 case DRR_WRITE_BYREF: 1376 { 1377 struct drr_write_byref drrwbr = 1378 drr->drr_u.drr_write_byref; 1379 ra.err = restore_write_byref(&ra, os, &drrwbr); 1380 break; 1381 } 1382 case DRR_FREE: 1383 { 1384 struct drr_free drrf = drr->drr_u.drr_free; 1385 ra.err = restore_free(&ra, os, &drrf); 1386 break; 1387 } 1388 case DRR_END: 1389 { 1390 struct drr_end drre = drr->drr_u.drr_end; 1391 /* 1392 * We compare against the *previous* checksum 1393 * value, because the stored checksum is of 1394 * everything before the DRR_END record. 1395 */ 1396 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum)) 1397 ra.err = ECKSUM; 1398 goto out; 1399 } 1400 case DRR_SPILL: 1401 { 1402 struct drr_spill drrs = drr->drr_u.drr_spill; 1403 ra.err = restore_spill(&ra, os, &drrs); 1404 break; 1405 } 1406 default: 1407 ra.err = EINVAL; 1408 goto out; 1409 } 1410 pcksum = ra.cksum; 1411 } 1412 ASSERT(ra.err != 0); 1413 1414 out: 1415 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1)) 1416 zfs_onexit_fd_rele(cleanup_fd); 1417 1418 if (ra.err != 0) { 1419 /* 1420 * destroy what we created, so we don't leave it in the 1421 * inconsistent restoring state. 1422 */ 1423 txg_wait_synced(drc->drc_real_ds->ds_dir->dd_pool, 0); 1424 1425 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, 1426 B_FALSE); 1427 if (drc->drc_real_ds != drc->drc_logical_ds) { 1428 mutex_exit(&drc->drc_logical_ds->ds_recvlock); 1429 dsl_dataset_rele(drc->drc_logical_ds, dmu_recv_tag); 1430 } 1431 } 1432 1433 kmem_free(ra.buf, ra.bufsize); 1434 *voffp = ra.voff; 1435 return (ra.err); 1436 } 1437 1438 struct recvendsyncarg { 1439 char *tosnap; 1440 uint64_t creation_time; 1441 uint64_t toguid; 1442 }; 1443 1444 static int 1445 recv_end_check(void *arg1, void *arg2, dmu_tx_t *tx) 1446 { 1447 dsl_dataset_t *ds = arg1; 1448 struct recvendsyncarg *resa = arg2; 1449 1450 return (dsl_dataset_snapshot_check(ds, resa->tosnap, tx)); 1451 } 1452 1453 static void 1454 recv_end_sync(void *arg1, void *arg2, dmu_tx_t *tx) 1455 { 1456 dsl_dataset_t *ds = arg1; 1457 struct recvendsyncarg *resa = arg2; 1458 1459 dsl_dataset_snapshot_sync(ds, resa->tosnap, tx); 1460 1461 /* set snapshot's creation time and guid */ 1462 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx); 1463 ds->ds_prev->ds_phys->ds_creation_time = resa->creation_time; 1464 ds->ds_prev->ds_phys->ds_guid = resa->toguid; 1465 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1466 1467 dmu_buf_will_dirty(ds->ds_dbuf, tx); 1468 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 1469 } 1470 1471 static int 1472 add_ds_to_guidmap(avl_tree_t *guid_map, dsl_dataset_t *ds) 1473 { 1474 dsl_pool_t *dp = ds->ds_dir->dd_pool; 1475 uint64_t snapobj = ds->ds_phys->ds_prev_snap_obj; 1476 dsl_dataset_t *snapds; 1477 guid_map_entry_t *gmep; 1478 int err; 1479 1480 ASSERT(guid_map != NULL); 1481 1482 rw_enter(&dp->dp_config_rwlock, RW_READER); 1483 err = dsl_dataset_hold_obj(dp, snapobj, guid_map, &snapds); 1484 if (err == 0) { 1485 gmep = kmem_alloc(sizeof (guid_map_entry_t), KM_SLEEP); 1486 gmep->guid = snapds->ds_phys->ds_guid; 1487 gmep->gme_ds = snapds; 1488 avl_add(guid_map, gmep); 1489 } 1490 1491 rw_exit(&dp->dp_config_rwlock); 1492 return (err); 1493 } 1494 1495 static int 1496 dmu_recv_existing_end(dmu_recv_cookie_t *drc) 1497 { 1498 struct recvendsyncarg resa; 1499 dsl_dataset_t *ds = drc->drc_logical_ds; 1500 int err; 1501 1502 /* 1503 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean() 1504 * expects it to have a ds_user_ptr (and zil), but clone_swap() 1505 * can close it. 1506 */ 1507 txg_wait_synced(ds->ds_dir->dd_pool, 0); 1508 1509 if (dsl_dataset_tryown(ds, FALSE, dmu_recv_tag)) { 1510 err = dsl_dataset_clone_swap(drc->drc_real_ds, ds, 1511 drc->drc_force); 1512 if (err) 1513 goto out; 1514 } else { 1515 mutex_exit(&ds->ds_recvlock); 1516 dsl_dataset_rele(ds, dmu_recv_tag); 1517 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, 1518 B_FALSE); 1519 return (EBUSY); 1520 } 1521 1522 resa.creation_time = drc->drc_drrb->drr_creation_time; 1523 resa.toguid = drc->drc_drrb->drr_toguid; 1524 resa.tosnap = drc->drc_tosnap; 1525 1526 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 1527 recv_end_check, recv_end_sync, ds, &resa, 3); 1528 if (err) { 1529 /* swap back */ 1530 (void) dsl_dataset_clone_swap(drc->drc_real_ds, ds, B_TRUE); 1531 } 1532 1533 out: 1534 mutex_exit(&ds->ds_recvlock); 1535 if (err == 0 && drc->drc_guid_to_ds_map != NULL) 1536 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds); 1537 dsl_dataset_disown(ds, dmu_recv_tag); 1538 (void) dsl_dataset_destroy(drc->drc_real_ds, dmu_recv_tag, B_FALSE); 1539 return (err); 1540 } 1541 1542 static int 1543 dmu_recv_new_end(dmu_recv_cookie_t *drc) 1544 { 1545 struct recvendsyncarg resa; 1546 dsl_dataset_t *ds = drc->drc_logical_ds; 1547 int err; 1548 1549 /* 1550 * XXX hack; seems the ds is still dirty and dsl_pool_zil_clean() 1551 * expects it to have a ds_user_ptr (and zil), but clone_swap() 1552 * can close it. 1553 */ 1554 txg_wait_synced(ds->ds_dir->dd_pool, 0); 1555 1556 resa.creation_time = drc->drc_drrb->drr_creation_time; 1557 resa.toguid = drc->drc_drrb->drr_toguid; 1558 resa.tosnap = drc->drc_tosnap; 1559 1560 err = dsl_sync_task_do(ds->ds_dir->dd_pool, 1561 recv_end_check, recv_end_sync, ds, &resa, 3); 1562 if (err) { 1563 /* clean up the fs we just recv'd into */ 1564 (void) dsl_dataset_destroy(ds, dmu_recv_tag, B_FALSE); 1565 } else { 1566 if (drc->drc_guid_to_ds_map != NULL) 1567 (void) add_ds_to_guidmap(drc->drc_guid_to_ds_map, ds); 1568 /* release the hold from dmu_recv_begin */ 1569 dsl_dataset_disown(ds, dmu_recv_tag); 1570 } 1571 return (err); 1572 } 1573 1574 int 1575 dmu_recv_end(dmu_recv_cookie_t *drc) 1576 { 1577 if (drc->drc_logical_ds != drc->drc_real_ds) 1578 return (dmu_recv_existing_end(drc)); 1579 else 1580 return (dmu_recv_new_end(drc)); 1581 } 1582