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