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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/dmu.h> 29 #include <sys/dmu_impl.h> 30 #include <sys/dmu_tx.h> 31 #include <sys/dbuf.h> 32 #include <sys/dnode.h> 33 #include <sys/zfs_context.h> 34 #include <sys/dmu_objset.h> 35 #include <sys/dmu_traverse.h> 36 #include <sys/dsl_dataset.h> 37 #include <sys/dsl_dir.h> 38 #include <sys/dsl_pool.h> 39 #include <sys/dsl_synctask.h> 40 #include <sys/zfs_ioctl.h> 41 #include <sys/zap.h> 42 #include <sys/zio_checksum.h> 43 44 struct backuparg { 45 dmu_replay_record_t *drr; 46 vnode_t *vp; 47 objset_t *os; 48 zio_cksum_t zc; 49 int err; 50 }; 51 52 static int 53 dump_bytes(struct backuparg *ba, void *buf, int len) 54 { 55 ssize_t resid; /* have to get resid to get detailed errno */ 56 ASSERT3U(len % 8, ==, 0); 57 58 fletcher_4_incremental_native(buf, len, &ba->zc); 59 ba->err = vn_rdwr(UIO_WRITE, ba->vp, 60 (caddr_t)buf, len, 61 0, UIO_SYSSPACE, FAPPEND, RLIM64_INFINITY, CRED(), &resid); 62 return (ba->err); 63 } 64 65 static int 66 dump_free(struct backuparg *ba, uint64_t object, uint64_t offset, 67 uint64_t length) 68 { 69 /* write a FREE record */ 70 bzero(ba->drr, sizeof (dmu_replay_record_t)); 71 ba->drr->drr_type = DRR_FREE; 72 ba->drr->drr_u.drr_free.drr_object = object; 73 ba->drr->drr_u.drr_free.drr_offset = offset; 74 ba->drr->drr_u.drr_free.drr_length = length; 75 76 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 77 return (EINTR); 78 return (0); 79 } 80 81 static int 82 dump_data(struct backuparg *ba, dmu_object_type_t type, 83 uint64_t object, uint64_t offset, int blksz, void *data) 84 { 85 /* write a DATA record */ 86 bzero(ba->drr, sizeof (dmu_replay_record_t)); 87 ba->drr->drr_type = DRR_WRITE; 88 ba->drr->drr_u.drr_write.drr_object = object; 89 ba->drr->drr_u.drr_write.drr_type = type; 90 ba->drr->drr_u.drr_write.drr_offset = offset; 91 ba->drr->drr_u.drr_write.drr_length = blksz; 92 93 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 94 return (EINTR); 95 if (dump_bytes(ba, data, blksz)) 96 return (EINTR); 97 return (0); 98 } 99 100 static int 101 dump_freeobjects(struct backuparg *ba, uint64_t firstobj, uint64_t numobjs) 102 { 103 /* write a FREEOBJECTS record */ 104 bzero(ba->drr, sizeof (dmu_replay_record_t)); 105 ba->drr->drr_type = DRR_FREEOBJECTS; 106 ba->drr->drr_u.drr_freeobjects.drr_firstobj = firstobj; 107 ba->drr->drr_u.drr_freeobjects.drr_numobjs = numobjs; 108 109 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 110 return (EINTR); 111 return (0); 112 } 113 114 static int 115 dump_dnode(struct backuparg *ba, uint64_t object, dnode_phys_t *dnp) 116 { 117 if (dnp == NULL || dnp->dn_type == DMU_OT_NONE) 118 return (dump_freeobjects(ba, object, 1)); 119 120 /* write an OBJECT record */ 121 bzero(ba->drr, sizeof (dmu_replay_record_t)); 122 ba->drr->drr_type = DRR_OBJECT; 123 ba->drr->drr_u.drr_object.drr_object = object; 124 ba->drr->drr_u.drr_object.drr_type = dnp->dn_type; 125 ba->drr->drr_u.drr_object.drr_bonustype = dnp->dn_bonustype; 126 ba->drr->drr_u.drr_object.drr_blksz = 127 dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT; 128 ba->drr->drr_u.drr_object.drr_bonuslen = dnp->dn_bonuslen; 129 ba->drr->drr_u.drr_object.drr_checksum = dnp->dn_checksum; 130 ba->drr->drr_u.drr_object.drr_compress = dnp->dn_compress; 131 132 if (dump_bytes(ba, ba->drr, sizeof (dmu_replay_record_t))) 133 return (EINTR); 134 135 if (dump_bytes(ba, DN_BONUS(dnp), P2ROUNDUP(dnp->dn_bonuslen, 8))) 136 return (EINTR); 137 138 /* free anything past the end of the file */ 139 if (dump_free(ba, object, (dnp->dn_maxblkid + 1) * 140 (dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT), -1ULL)) 141 return (EINTR); 142 if (ba->err) 143 return (EINTR); 144 return (0); 145 } 146 147 #define BP_SPAN(dnp, level) \ 148 (((uint64_t)dnp->dn_datablkszsec) << (SPA_MINBLOCKSHIFT + \ 149 (level) * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) 150 151 static int 152 backup_cb(traverse_blk_cache_t *bc, spa_t *spa, void *arg) 153 { 154 struct backuparg *ba = arg; 155 uint64_t object = bc->bc_bookmark.zb_object; 156 int level = bc->bc_bookmark.zb_level; 157 uint64_t blkid = bc->bc_bookmark.zb_blkid; 158 blkptr_t *bp = bc->bc_blkptr.blk_birth ? &bc->bc_blkptr : NULL; 159 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE; 160 void *data = bc->bc_data; 161 int err = 0; 162 163 if (issig(JUSTLOOKING) && issig(FORREAL)) 164 return (EINTR); 165 166 ASSERT(data || bp == NULL); 167 168 if (bp == NULL && object == 0) { 169 uint64_t span = BP_SPAN(bc->bc_dnode, level); 170 uint64_t dnobj = (blkid * span) >> DNODE_SHIFT; 171 err = dump_freeobjects(ba, dnobj, span >> DNODE_SHIFT); 172 } else if (bp == NULL) { 173 uint64_t span = BP_SPAN(bc->bc_dnode, level); 174 err = dump_free(ba, object, blkid * span, span); 175 } else if (data && level == 0 && type == DMU_OT_DNODE) { 176 dnode_phys_t *blk = data; 177 int i; 178 int blksz = BP_GET_LSIZE(bp); 179 180 for (i = 0; i < blksz >> DNODE_SHIFT; i++) { 181 uint64_t dnobj = 182 (blkid << (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i; 183 err = dump_dnode(ba, dnobj, blk+i); 184 if (err) 185 break; 186 } 187 } else if (level == 0 && 188 type != DMU_OT_DNODE && type != DMU_OT_OBJSET) { 189 int blksz = BP_GET_LSIZE(bp); 190 if (data == NULL) { 191 uint32_t aflags = ARC_WAIT; 192 arc_buf_t *abuf; 193 zbookmark_t zb; 194 195 zb.zb_objset = ba->os->os->os_dsl_dataset->ds_object; 196 zb.zb_object = object; 197 zb.zb_level = level; 198 zb.zb_blkid = blkid; 199 (void) arc_read(NULL, spa, bp, 200 dmu_ot[type].ot_byteswap, arc_getbuf_func, &abuf, 201 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_MUSTSUCCEED, 202 &aflags, &zb); 203 204 if (abuf) { 205 err = dump_data(ba, type, object, blkid * blksz, 206 blksz, abuf->b_data); 207 (void) arc_buf_remove_ref(abuf, &abuf); 208 } 209 } else { 210 err = dump_data(ba, type, object, blkid * blksz, 211 blksz, data); 212 } 213 } 214 215 ASSERT(err == 0 || err == EINTR); 216 return (err); 217 } 218 219 int 220 dmu_sendbackup(objset_t *tosnap, objset_t *fromsnap, vnode_t *vp) 221 { 222 dsl_dataset_t *ds = tosnap->os->os_dsl_dataset; 223 dsl_dataset_t *fromds = fromsnap ? fromsnap->os->os_dsl_dataset : NULL; 224 dmu_replay_record_t *drr; 225 struct backuparg ba; 226 int err; 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 >= 235 ds->ds_phys->ds_creation_txg)) 236 return (EXDEV); 237 238 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP); 239 drr->drr_type = DRR_BEGIN; 240 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC; 241 drr->drr_u.drr_begin.drr_version = DMU_BACKUP_VERSION; 242 drr->drr_u.drr_begin.drr_creation_time = 243 ds->ds_phys->ds_creation_time; 244 drr->drr_u.drr_begin.drr_type = tosnap->os->os_phys->os_type; 245 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid; 246 if (fromds) 247 drr->drr_u.drr_begin.drr_fromguid = fromds->ds_phys->ds_guid; 248 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname); 249 250 ba.drr = drr; 251 ba.vp = vp; 252 ba.os = tosnap; 253 ZIO_SET_CHECKSUM(&ba.zc, 0, 0, 0, 0); 254 255 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) { 256 kmem_free(drr, sizeof (dmu_replay_record_t)); 257 return (ba.err); 258 } 259 260 err = traverse_dsl_dataset(ds, 261 fromds ? fromds->ds_phys->ds_creation_txg : 0, 262 ADVANCE_PRE | ADVANCE_HOLES | ADVANCE_DATA | ADVANCE_NOLOCK, 263 backup_cb, &ba); 264 265 if (err) { 266 if (err == EINTR && ba.err) 267 err = ba.err; 268 kmem_free(drr, sizeof (dmu_replay_record_t)); 269 return (err); 270 } 271 272 bzero(drr, sizeof (dmu_replay_record_t)); 273 drr->drr_type = DRR_END; 274 drr->drr_u.drr_end.drr_checksum = ba.zc; 275 276 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) { 277 kmem_free(drr, sizeof (dmu_replay_record_t)); 278 return (ba.err); 279 } 280 281 kmem_free(drr, sizeof (dmu_replay_record_t)); 282 283 return (0); 284 } 285 286 struct restorearg { 287 int err; 288 int byteswap; 289 vnode_t *vp; 290 char *buf; 291 uint64_t voff; 292 int buflen; /* number of valid bytes in buf */ 293 int bufoff; /* next offset to read */ 294 int bufsize; /* amount of memory allocated for buf */ 295 zio_cksum_t zc; 296 }; 297 298 /* ARGSUSED */ 299 static int 300 replay_incremental_check(void *arg1, void *arg2, dmu_tx_t *tx) 301 { 302 dsl_dataset_t *ds = arg1; 303 struct drr_begin *drrb = arg2; 304 const char *snapname; 305 int err; 306 uint64_t val; 307 308 /* must already be a snapshot of this fs */ 309 if (ds->ds_phys->ds_prev_snap_obj == 0) 310 return (ENODEV); 311 312 /* most recent snapshot must match fromguid */ 313 if (ds->ds_prev->ds_phys->ds_guid != drrb->drr_fromguid) 314 return (ENODEV); 315 /* must not have any changes since most recent snapshot */ 316 if (ds->ds_phys->ds_bp.blk_birth > 317 ds->ds_prev->ds_phys->ds_creation_txg) 318 return (ETXTBSY); 319 320 /* new snapshot name must not exist */ 321 snapname = strrchr(drrb->drr_toname, '@'); 322 if (snapname == NULL) 323 return (EEXIST); 324 325 snapname++; 326 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 327 ds->ds_phys->ds_snapnames_zapobj, snapname, 8, 1, &val); 328 if (err == 0) 329 return (EEXIST); 330 if (err != ENOENT) 331 return (err); 332 333 return (0); 334 } 335 336 /* ARGSUSED */ 337 static void 338 replay_incremental_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 339 { 340 dsl_dataset_t *ds = arg1; 341 dmu_buf_will_dirty(ds->ds_dbuf, tx); 342 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 343 344 spa_history_internal_log(LOG_DS_REPLAY_INC_SYNC, 345 ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld", 346 ds->ds_phys->ds_dir_obj); 347 } 348 349 /* ARGSUSED */ 350 static int 351 replay_full_check(void *arg1, void *arg2, dmu_tx_t *tx) 352 { 353 dsl_dir_t *dd = arg1; 354 struct drr_begin *drrb = arg2; 355 objset_t *mos = dd->dd_pool->dp_meta_objset; 356 char *cp; 357 uint64_t val; 358 int err; 359 360 cp = strchr(drrb->drr_toname, '@'); 361 *cp = '\0'; 362 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 363 strrchr(drrb->drr_toname, '/') + 1, 364 sizeof (uint64_t), 1, &val); 365 *cp = '@'; 366 367 if (err != ENOENT) 368 return (err ? err : EEXIST); 369 370 return (0); 371 } 372 373 static void 374 replay_full_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 375 { 376 dsl_dir_t *dd = arg1; 377 struct drr_begin *drrb = arg2; 378 char *cp; 379 dsl_dataset_t *ds; 380 uint64_t dsobj; 381 382 cp = strchr(drrb->drr_toname, '@'); 383 *cp = '\0'; 384 dsobj = dsl_dataset_create_sync(dd, strrchr(drrb->drr_toname, '/') + 1, 385 NULL, tx); 386 387 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dsobj, NULL, 388 DS_MODE_EXCLUSIVE, FTAG, &ds)); 389 390 (void) dmu_objset_create_impl(dsl_dataset_get_spa(ds), 391 ds, &ds->ds_phys->ds_bp, drrb->drr_type, tx); 392 393 dmu_buf_will_dirty(ds->ds_dbuf, tx); 394 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 395 396 spa_history_internal_log(LOG_DS_REPLAY_FULL_SYNC, 397 ds->ds_dir->dd_pool->dp_spa, tx, cr, "dataset = %lld", 398 ds->ds_phys->ds_dir_obj); 399 400 *cp = '@'; 401 402 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 403 } 404 405 static int 406 replay_end_check(void *arg1, void *arg2, dmu_tx_t *tx) 407 { 408 objset_t *os = arg1; 409 struct drr_begin *drrb = arg2; 410 char *snapname; 411 412 /* XXX verify that drr_toname is in dd */ 413 414 snapname = strchr(drrb->drr_toname, '@'); 415 if (snapname == NULL) 416 return (EINVAL); 417 snapname++; 418 419 return (dsl_dataset_snapshot_check(os, snapname, tx)); 420 } 421 422 static void 423 replay_end_sync(void *arg1, void *arg2, cred_t *cr, dmu_tx_t *tx) 424 { 425 objset_t *os = arg1; 426 struct drr_begin *drrb = arg2; 427 char *snapname; 428 dsl_dataset_t *ds, *hds; 429 430 snapname = strchr(drrb->drr_toname, '@') + 1; 431 432 dsl_dataset_snapshot_sync(os, snapname, cr, tx); 433 434 /* set snapshot's creation time and guid */ 435 hds = os->os->os_dsl_dataset; 436 VERIFY(0 == dsl_dataset_open_obj(hds->ds_dir->dd_pool, 437 hds->ds_phys->ds_prev_snap_obj, NULL, 438 DS_MODE_PRIMARY | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 439 FTAG, &ds)); 440 441 dmu_buf_will_dirty(ds->ds_dbuf, tx); 442 ds->ds_phys->ds_creation_time = drrb->drr_creation_time; 443 ds->ds_phys->ds_guid = drrb->drr_toguid; 444 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 445 446 /* log the end of the receive */ 447 spa_history_internal_log(LOG_DS_RECEIVE, ds->ds_dir->dd_pool->dp_spa, 448 tx, cr, "dataset = %llu", ds->ds_phys->ds_dir_obj); 449 450 dsl_dataset_close(ds, DS_MODE_PRIMARY, FTAG); 451 452 dmu_buf_will_dirty(hds->ds_dbuf, tx); 453 hds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 454 } 455 456 static void * 457 restore_read(struct restorearg *ra, int len) 458 { 459 void *rv; 460 461 /* some things will require 8-byte alignment, so everything must */ 462 ASSERT3U(len % 8, ==, 0); 463 464 while (ra->buflen - ra->bufoff < len) { 465 ssize_t resid; 466 int leftover = ra->buflen - ra->bufoff; 467 468 (void) memmove(ra->buf, ra->buf + ra->bufoff, leftover); 469 ra->err = vn_rdwr(UIO_READ, ra->vp, 470 (caddr_t)ra->buf + leftover, ra->bufsize - leftover, 471 ra->voff, UIO_SYSSPACE, FAPPEND, 472 RLIM64_INFINITY, CRED(), &resid); 473 474 ra->voff += ra->bufsize - leftover - resid; 475 ra->buflen = ra->bufsize - resid; 476 ra->bufoff = 0; 477 if (resid == ra->bufsize - leftover) 478 ra->err = EINVAL; 479 if (ra->err) 480 return (NULL); 481 /* Could compute checksum here? */ 482 } 483 484 ASSERT3U(ra->bufoff % 8, ==, 0); 485 ASSERT3U(ra->buflen - ra->bufoff, >=, len); 486 rv = ra->buf + ra->bufoff; 487 ra->bufoff += len; 488 if (ra->byteswap) 489 fletcher_4_incremental_byteswap(rv, len, &ra->zc); 490 else 491 fletcher_4_incremental_native(rv, len, &ra->zc); 492 return (rv); 493 } 494 495 static void 496 backup_byteswap(dmu_replay_record_t *drr) 497 { 498 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 499 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 500 drr->drr_type = BSWAP_32(drr->drr_type); 501 switch (drr->drr_type) { 502 case DRR_BEGIN: 503 DO64(drr_begin.drr_magic); 504 DO64(drr_begin.drr_version); 505 DO64(drr_begin.drr_creation_time); 506 DO32(drr_begin.drr_type); 507 DO64(drr_begin.drr_toguid); 508 DO64(drr_begin.drr_fromguid); 509 break; 510 case DRR_OBJECT: 511 DO64(drr_object.drr_object); 512 /* DO64(drr_object.drr_allocation_txg); */ 513 DO32(drr_object.drr_type); 514 DO32(drr_object.drr_bonustype); 515 DO32(drr_object.drr_blksz); 516 DO32(drr_object.drr_bonuslen); 517 break; 518 case DRR_FREEOBJECTS: 519 DO64(drr_freeobjects.drr_firstobj); 520 DO64(drr_freeobjects.drr_numobjs); 521 break; 522 case DRR_WRITE: 523 DO64(drr_write.drr_object); 524 DO32(drr_write.drr_type); 525 DO64(drr_write.drr_offset); 526 DO64(drr_write.drr_length); 527 break; 528 case DRR_FREE: 529 DO64(drr_free.drr_object); 530 DO64(drr_free.drr_offset); 531 DO64(drr_free.drr_length); 532 break; 533 case DRR_END: 534 DO64(drr_end.drr_checksum.zc_word[0]); 535 DO64(drr_end.drr_checksum.zc_word[1]); 536 DO64(drr_end.drr_checksum.zc_word[2]); 537 DO64(drr_end.drr_checksum.zc_word[3]); 538 break; 539 } 540 #undef DO64 541 #undef DO32 542 } 543 544 static int 545 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) 546 { 547 int err; 548 dmu_tx_t *tx; 549 550 err = dmu_object_info(os, drro->drr_object, NULL); 551 552 if (err != 0 && err != ENOENT) 553 return (EINVAL); 554 555 if (drro->drr_type == DMU_OT_NONE || 556 drro->drr_type >= DMU_OT_NUMTYPES || 557 drro->drr_bonustype >= DMU_OT_NUMTYPES || 558 drro->drr_checksum >= ZIO_CHECKSUM_FUNCTIONS || 559 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 560 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 561 drro->drr_blksz < SPA_MINBLOCKSIZE || 562 drro->drr_blksz > SPA_MAXBLOCKSIZE || 563 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 564 return (EINVAL); 565 } 566 567 tx = dmu_tx_create(os); 568 569 if (err == ENOENT) { 570 /* currently free, want to be allocated */ 571 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 572 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 1); 573 err = dmu_tx_assign(tx, TXG_WAIT); 574 if (err) { 575 dmu_tx_abort(tx); 576 return (err); 577 } 578 err = dmu_object_claim(os, drro->drr_object, 579 drro->drr_type, drro->drr_blksz, 580 drro->drr_bonustype, drro->drr_bonuslen, tx); 581 } else { 582 /* currently allocated, want to be allocated */ 583 dmu_tx_hold_bonus(tx, drro->drr_object); 584 /* 585 * We may change blocksize, so need to 586 * hold_write 587 */ 588 dmu_tx_hold_write(tx, drro->drr_object, 0, 1); 589 err = dmu_tx_assign(tx, TXG_WAIT); 590 if (err) { 591 dmu_tx_abort(tx); 592 return (err); 593 } 594 595 err = dmu_object_reclaim(os, drro->drr_object, 596 drro->drr_type, drro->drr_blksz, 597 drro->drr_bonustype, drro->drr_bonuslen, tx); 598 } 599 if (err) { 600 dmu_tx_commit(tx); 601 return (EINVAL); 602 } 603 604 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksum, tx); 605 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); 606 607 if (drro->drr_bonuslen) { 608 dmu_buf_t *db; 609 void *data; 610 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); 611 dmu_buf_will_dirty(db, tx); 612 613 ASSERT3U(db->db_size, >=, drro->drr_bonuslen); 614 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8)); 615 if (data == NULL) { 616 dmu_tx_commit(tx); 617 return (ra->err); 618 } 619 bcopy(data, db->db_data, drro->drr_bonuslen); 620 if (ra->byteswap) { 621 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data, 622 drro->drr_bonuslen); 623 } 624 dmu_buf_rele(db, FTAG); 625 } 626 dmu_tx_commit(tx); 627 return (0); 628 } 629 630 /* ARGSUSED */ 631 static int 632 restore_freeobjects(struct restorearg *ra, objset_t *os, 633 struct drr_freeobjects *drrfo) 634 { 635 uint64_t obj; 636 637 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 638 return (EINVAL); 639 640 for (obj = drrfo->drr_firstobj; 641 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 642 (void) dmu_object_next(os, &obj, FALSE, 0)) { 643 dmu_tx_t *tx; 644 int err; 645 646 if (dmu_object_info(os, obj, NULL) != 0) 647 continue; 648 649 tx = dmu_tx_create(os); 650 dmu_tx_hold_bonus(tx, obj); 651 err = dmu_tx_assign(tx, TXG_WAIT); 652 if (err) { 653 dmu_tx_abort(tx); 654 return (err); 655 } 656 err = dmu_object_free(os, obj, tx); 657 dmu_tx_commit(tx); 658 if (err && err != ENOENT) 659 return (EINVAL); 660 } 661 return (0); 662 } 663 664 static int 665 restore_write(struct restorearg *ra, objset_t *os, 666 struct drr_write *drrw) 667 { 668 dmu_tx_t *tx; 669 void *data; 670 int err; 671 672 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 673 drrw->drr_type >= DMU_OT_NUMTYPES) 674 return (EINVAL); 675 676 data = restore_read(ra, drrw->drr_length); 677 if (data == NULL) 678 return (ra->err); 679 680 if (dmu_object_info(os, drrw->drr_object, NULL) != 0) 681 return (EINVAL); 682 683 tx = dmu_tx_create(os); 684 685 dmu_tx_hold_write(tx, drrw->drr_object, 686 drrw->drr_offset, drrw->drr_length); 687 err = dmu_tx_assign(tx, TXG_WAIT); 688 if (err) { 689 dmu_tx_abort(tx); 690 return (err); 691 } 692 if (ra->byteswap) 693 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length); 694 dmu_write(os, drrw->drr_object, 695 drrw->drr_offset, drrw->drr_length, data, tx); 696 dmu_tx_commit(tx); 697 return (0); 698 } 699 700 /* ARGSUSED */ 701 static int 702 restore_free(struct restorearg *ra, objset_t *os, 703 struct drr_free *drrf) 704 { 705 dmu_tx_t *tx; 706 int err; 707 708 if (drrf->drr_length != -1ULL && 709 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 710 return (EINVAL); 711 712 if (dmu_object_info(os, drrf->drr_object, NULL) != 0) 713 return (EINVAL); 714 715 tx = dmu_tx_create(os); 716 717 dmu_tx_hold_free(tx, drrf->drr_object, 718 drrf->drr_offset, drrf->drr_length); 719 err = dmu_tx_assign(tx, TXG_WAIT); 720 if (err) { 721 dmu_tx_abort(tx); 722 return (err); 723 } 724 err = dmu_free_range(os, drrf->drr_object, 725 drrf->drr_offset, drrf->drr_length, tx); 726 dmu_tx_commit(tx); 727 return (err); 728 } 729 730 int 731 dmu_recvbackup(char *tosnap, struct drr_begin *drrb, uint64_t *sizep, 732 boolean_t force, vnode_t *vp, uint64_t voffset) 733 { 734 struct restorearg ra; 735 dmu_replay_record_t *drr; 736 char *cp; 737 objset_t *os = NULL; 738 zio_cksum_t pzc; 739 740 bzero(&ra, sizeof (ra)); 741 ra.vp = vp; 742 ra.voff = voffset; 743 ra.bufsize = 1<<20; 744 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); 745 746 if (drrb->drr_magic == DMU_BACKUP_MAGIC) { 747 ra.byteswap = FALSE; 748 } else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 749 ra.byteswap = TRUE; 750 } else { 751 ra.err = EINVAL; 752 goto out; 753 } 754 755 /* 756 * NB: this assumes that struct drr_begin will be the largest in 757 * dmu_replay_record_t's drr_u, and thus we don't need to pad it 758 * with zeros to make it the same length as we wrote out. 759 */ 760 ((dmu_replay_record_t *)ra.buf)->drr_type = DRR_BEGIN; 761 ((dmu_replay_record_t *)ra.buf)->drr_pad = 0; 762 ((dmu_replay_record_t *)ra.buf)->drr_u.drr_begin = *drrb; 763 if (ra.byteswap) { 764 fletcher_4_incremental_byteswap(ra.buf, 765 sizeof (dmu_replay_record_t), &ra.zc); 766 } else { 767 fletcher_4_incremental_native(ra.buf, 768 sizeof (dmu_replay_record_t), &ra.zc); 769 } 770 (void) strcpy(drrb->drr_toname, tosnap); /* for the sync funcs */ 771 772 if (ra.byteswap) { 773 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 774 drrb->drr_version = BSWAP_64(drrb->drr_version); 775 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 776 drrb->drr_type = BSWAP_32(drrb->drr_type); 777 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 778 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 779 } 780 781 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 782 783 if (drrb->drr_version != DMU_BACKUP_VERSION || 784 drrb->drr_type >= DMU_OST_NUMTYPES || 785 strchr(drrb->drr_toname, '@') == NULL) { 786 ra.err = EINVAL; 787 goto out; 788 } 789 790 /* 791 * Process the begin in syncing context. 792 */ 793 if (drrb->drr_fromguid) { 794 /* incremental backup */ 795 dsl_dataset_t *ds = NULL; 796 797 cp = strchr(tosnap, '@'); 798 *cp = '\0'; 799 ra.err = dsl_dataset_open(tosnap, DS_MODE_EXCLUSIVE, FTAG, &ds); 800 *cp = '@'; 801 if (ra.err) 802 goto out; 803 804 /* 805 * Only do the rollback if the most recent snapshot 806 * matches the incremental source 807 */ 808 if (force) { 809 if (ds->ds_prev == NULL || 810 ds->ds_prev->ds_phys->ds_guid != 811 drrb->drr_fromguid) { 812 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 813 kmem_free(ra.buf, ra.bufsize); 814 return (ENODEV); 815 } 816 (void) dsl_dataset_rollback(ds); 817 } 818 ra.err = dsl_sync_task_do(ds->ds_dir->dd_pool, 819 replay_incremental_check, replay_incremental_sync, 820 ds, drrb, 1); 821 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 822 } else { 823 /* full backup */ 824 dsl_dir_t *dd = NULL; 825 const char *tail; 826 827 /* can't restore full backup into topmost fs, for now */ 828 if (strrchr(drrb->drr_toname, '/') == NULL) { 829 ra.err = EINVAL; 830 goto out; 831 } 832 833 cp = strchr(tosnap, '@'); 834 *cp = '\0'; 835 ra.err = dsl_dir_open(tosnap, FTAG, &dd, &tail); 836 *cp = '@'; 837 if (ra.err) 838 goto out; 839 if (tail == NULL) { 840 ra.err = EEXIST; 841 goto out; 842 } 843 844 ra.err = dsl_sync_task_do(dd->dd_pool, replay_full_check, 845 replay_full_sync, dd, drrb, 5); 846 dsl_dir_close(dd, FTAG); 847 } 848 if (ra.err) 849 goto out; 850 851 /* 852 * Open the objset we are modifying. 853 */ 854 855 cp = strchr(tosnap, '@'); 856 *cp = '\0'; 857 ra.err = dmu_objset_open(tosnap, DMU_OST_ANY, 858 DS_MODE_PRIMARY | DS_MODE_INCONSISTENT, &os); 859 *cp = '@'; 860 ASSERT3U(ra.err, ==, 0); 861 862 /* 863 * Read records and process them. 864 */ 865 pzc = ra.zc; 866 while (ra.err == 0 && 867 NULL != (drr = restore_read(&ra, sizeof (*drr)))) { 868 if (issig(JUSTLOOKING) && issig(FORREAL)) { 869 ra.err = EINTR; 870 goto out; 871 } 872 873 if (ra.byteswap) 874 backup_byteswap(drr); 875 876 switch (drr->drr_type) { 877 case DRR_OBJECT: 878 { 879 /* 880 * We need to make a copy of the record header, 881 * because restore_{object,write} may need to 882 * restore_read(), which will invalidate drr. 883 */ 884 struct drr_object drro = drr->drr_u.drr_object; 885 ra.err = restore_object(&ra, os, &drro); 886 break; 887 } 888 case DRR_FREEOBJECTS: 889 { 890 struct drr_freeobjects drrfo = 891 drr->drr_u.drr_freeobjects; 892 ra.err = restore_freeobjects(&ra, os, &drrfo); 893 break; 894 } 895 case DRR_WRITE: 896 { 897 struct drr_write drrw = drr->drr_u.drr_write; 898 ra.err = restore_write(&ra, os, &drrw); 899 break; 900 } 901 case DRR_FREE: 902 { 903 struct drr_free drrf = drr->drr_u.drr_free; 904 ra.err = restore_free(&ra, os, &drrf); 905 break; 906 } 907 case DRR_END: 908 { 909 struct drr_end drre = drr->drr_u.drr_end; 910 /* 911 * We compare against the *previous* checksum 912 * value, because the stored checksum is of 913 * everything before the DRR_END record. 914 */ 915 if (drre.drr_checksum.zc_word[0] != 0 && 916 !ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pzc)) { 917 ra.err = ECKSUM; 918 goto out; 919 } 920 921 ra.err = dsl_sync_task_do(dmu_objset_ds(os)-> 922 ds_dir->dd_pool, replay_end_check, replay_end_sync, 923 os, drrb, 3); 924 goto out; 925 } 926 default: 927 ra.err = EINVAL; 928 goto out; 929 } 930 pzc = ra.zc; 931 } 932 933 out: 934 if (os) 935 dmu_objset_close(os); 936 937 /* 938 * Make sure we don't rollback/destroy unless we actually 939 * processed the begin properly. 'os' will only be set if this 940 * is the case. 941 */ 942 if (ra.err && os && tosnap && strchr(tosnap, '@')) { 943 /* 944 * rollback or destroy what we created, so we don't 945 * leave it in the restoring state. 946 */ 947 dsl_dataset_t *ds; 948 int err; 949 950 cp = strchr(tosnap, '@'); 951 *cp = '\0'; 952 err = dsl_dataset_open(tosnap, 953 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, 954 FTAG, &ds); 955 if (err == 0) { 956 txg_wait_synced(ds->ds_dir->dd_pool, 0); 957 if (drrb->drr_fromguid) { 958 /* incremental: rollback to most recent snap */ 959 (void) dsl_dataset_rollback(ds); 960 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 961 } else { 962 /* full: destroy whole fs */ 963 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 964 (void) dsl_dataset_destroy(tosnap); 965 } 966 } 967 *cp = '@'; 968 } 969 970 kmem_free(ra.buf, ra.bufsize); 971 if (sizep) 972 *sizep = ra.voff; 973 return (ra.err); 974 } 975