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 2006 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 return (err); 269 } 270 271 bzero(drr, sizeof (dmu_replay_record_t)); 272 drr->drr_type = DRR_END; 273 drr->drr_u.drr_end.drr_checksum = ba.zc; 274 275 if (dump_bytes(&ba, drr, sizeof (dmu_replay_record_t))) 276 return (ba.err); 277 278 kmem_free(drr, sizeof (dmu_replay_record_t)); 279 280 return (0); 281 } 282 283 struct restorearg { 284 int err; 285 int byteswap; 286 vnode_t *vp; 287 char *buf; 288 uint64_t voff; 289 int buflen; /* number of valid bytes in buf */ 290 int bufoff; /* next offset to read */ 291 int bufsize; /* amount of memory allocated for buf */ 292 zio_cksum_t zc; 293 }; 294 295 /* ARGSUSED */ 296 static int 297 replay_incremental_check(void *arg1, void *arg2, dmu_tx_t *tx) 298 { 299 dsl_dataset_t *ds = arg1; 300 struct drr_begin *drrb = arg2; 301 const char *snapname; 302 int err; 303 uint64_t val; 304 305 /* must already be a snapshot of this fs */ 306 if (ds->ds_phys->ds_prev_snap_obj == 0) 307 return (ENODEV); 308 309 /* most recent snapshot must match fromguid */ 310 if (ds->ds_prev->ds_phys->ds_guid != drrb->drr_fromguid) 311 return (ENODEV); 312 /* must not have any changes since most recent snapshot */ 313 if (ds->ds_phys->ds_bp.blk_birth > 314 ds->ds_prev->ds_phys->ds_creation_txg) 315 return (ETXTBSY); 316 317 /* new snapshot name must not exist */ 318 snapname = strrchr(drrb->drr_toname, '@'); 319 if (snapname == NULL) 320 return (EEXIST); 321 322 snapname++; 323 err = zap_lookup(ds->ds_dir->dd_pool->dp_meta_objset, 324 ds->ds_phys->ds_snapnames_zapobj, snapname, 8, 1, &val); 325 if (err == 0) 326 return (EEXIST); 327 if (err != ENOENT) 328 return (err); 329 330 return (0); 331 } 332 333 /* ARGSUSED */ 334 static void 335 replay_incremental_sync(void *arg1, void *arg2, dmu_tx_t *tx) 336 { 337 dsl_dataset_t *ds = arg1; 338 dmu_buf_will_dirty(ds->ds_dbuf, tx); 339 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 340 } 341 342 /* ARGSUSED */ 343 static int 344 replay_full_check(void *arg1, void *arg2, dmu_tx_t *tx) 345 { 346 dsl_dir_t *dd = arg1; 347 struct drr_begin *drrb = arg2; 348 objset_t *mos = dd->dd_pool->dp_meta_objset; 349 char *cp; 350 uint64_t val; 351 int err; 352 353 cp = strchr(drrb->drr_toname, '@'); 354 *cp = '\0'; 355 err = zap_lookup(mos, dd->dd_phys->dd_child_dir_zapobj, 356 strrchr(drrb->drr_toname, '/') + 1, 357 sizeof (uint64_t), 1, &val); 358 *cp = '@'; 359 360 if (err != ENOENT) 361 return (err ? err : EEXIST); 362 363 return (0); 364 } 365 366 static void 367 replay_full_sync(void *arg1, void *arg2, dmu_tx_t *tx) 368 { 369 dsl_dir_t *dd = arg1; 370 struct drr_begin *drrb = arg2; 371 char *cp; 372 dsl_dataset_t *ds; 373 uint64_t dsobj; 374 375 cp = strchr(drrb->drr_toname, '@'); 376 *cp = '\0'; 377 dsobj = dsl_dataset_create_sync(dd, strrchr(drrb->drr_toname, '/') + 1, 378 NULL, tx); 379 *cp = '@'; 380 381 VERIFY(0 == dsl_dataset_open_obj(dd->dd_pool, dsobj, NULL, 382 DS_MODE_EXCLUSIVE, FTAG, &ds)); 383 384 (void) dmu_objset_create_impl(dsl_dataset_get_spa(ds), 385 ds, drrb->drr_type, tx); 386 387 dmu_buf_will_dirty(ds->ds_dbuf, tx); 388 ds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT; 389 390 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 391 } 392 393 static int 394 replay_end_check(void *arg1, void *arg2, dmu_tx_t *tx) 395 { 396 objset_t *os = arg1; 397 struct drr_begin *drrb = arg2; 398 char *snapname; 399 400 /* XXX verify that drr_toname is in dd */ 401 402 snapname = strchr(drrb->drr_toname, '@'); 403 if (snapname == NULL) 404 return (EINVAL); 405 snapname++; 406 407 return (dsl_dataset_snapshot_check(os, snapname, tx)); 408 } 409 410 static void 411 replay_end_sync(void *arg1, void *arg2, dmu_tx_t *tx) 412 { 413 objset_t *os = arg1; 414 struct drr_begin *drrb = arg2; 415 char *snapname; 416 dsl_dataset_t *ds, *hds; 417 418 snapname = strchr(drrb->drr_toname, '@') + 1; 419 420 dsl_dataset_snapshot_sync(os, snapname, tx); 421 422 /* set snapshot's creation time and guid */ 423 hds = os->os->os_dsl_dataset; 424 VERIFY(0 == dsl_dataset_open_obj(hds->ds_dir->dd_pool, 425 hds->ds_phys->ds_prev_snap_obj, NULL, 426 DS_MODE_PRIMARY | DS_MODE_READONLY | DS_MODE_INCONSISTENT, 427 FTAG, &ds)); 428 429 dmu_buf_will_dirty(ds->ds_dbuf, tx); 430 ds->ds_phys->ds_creation_time = drrb->drr_creation_time; 431 ds->ds_phys->ds_guid = drrb->drr_toguid; 432 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 433 434 dsl_dataset_close(ds, DS_MODE_PRIMARY, FTAG); 435 436 dmu_buf_will_dirty(hds->ds_dbuf, tx); 437 hds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT; 438 } 439 440 static void * 441 restore_read(struct restorearg *ra, int len) 442 { 443 void *rv; 444 445 /* some things will require 8-byte alignment, so everything must */ 446 ASSERT3U(len % 8, ==, 0); 447 448 while (ra->buflen - ra->bufoff < len) { 449 ssize_t resid; 450 int leftover = ra->buflen - ra->bufoff; 451 452 (void) memmove(ra->buf, ra->buf + ra->bufoff, leftover); 453 ra->err = vn_rdwr(UIO_READ, ra->vp, 454 (caddr_t)ra->buf + leftover, ra->bufsize - leftover, 455 ra->voff, UIO_SYSSPACE, FAPPEND, 456 RLIM64_INFINITY, CRED(), &resid); 457 458 ra->voff += ra->bufsize - leftover - resid; 459 ra->buflen = ra->bufsize - resid; 460 ra->bufoff = 0; 461 if (resid == ra->bufsize - leftover) 462 ra->err = EINVAL; 463 if (ra->err) 464 return (NULL); 465 /* Could compute checksum here? */ 466 } 467 468 ASSERT3U(ra->bufoff % 8, ==, 0); 469 ASSERT3U(ra->buflen - ra->bufoff, >=, len); 470 rv = ra->buf + ra->bufoff; 471 ra->bufoff += len; 472 if (ra->byteswap) 473 fletcher_4_incremental_byteswap(rv, len, &ra->zc); 474 else 475 fletcher_4_incremental_native(rv, len, &ra->zc); 476 return (rv); 477 } 478 479 static void 480 backup_byteswap(dmu_replay_record_t *drr) 481 { 482 #define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X)) 483 #define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X)) 484 drr->drr_type = BSWAP_32(drr->drr_type); 485 switch (drr->drr_type) { 486 case DRR_BEGIN: 487 DO64(drr_begin.drr_magic); 488 DO64(drr_begin.drr_version); 489 DO64(drr_begin.drr_creation_time); 490 DO32(drr_begin.drr_type); 491 DO64(drr_begin.drr_toguid); 492 DO64(drr_begin.drr_fromguid); 493 break; 494 case DRR_OBJECT: 495 DO64(drr_object.drr_object); 496 /* DO64(drr_object.drr_allocation_txg); */ 497 DO32(drr_object.drr_type); 498 DO32(drr_object.drr_bonustype); 499 DO32(drr_object.drr_blksz); 500 DO32(drr_object.drr_bonuslen); 501 break; 502 case DRR_FREEOBJECTS: 503 DO64(drr_freeobjects.drr_firstobj); 504 DO64(drr_freeobjects.drr_numobjs); 505 break; 506 case DRR_WRITE: 507 DO64(drr_write.drr_object); 508 DO32(drr_write.drr_type); 509 DO64(drr_write.drr_offset); 510 DO64(drr_write.drr_length); 511 break; 512 case DRR_FREE: 513 DO64(drr_free.drr_object); 514 DO64(drr_free.drr_offset); 515 DO64(drr_free.drr_length); 516 break; 517 case DRR_END: 518 DO64(drr_end.drr_checksum.zc_word[0]); 519 DO64(drr_end.drr_checksum.zc_word[1]); 520 DO64(drr_end.drr_checksum.zc_word[2]); 521 DO64(drr_end.drr_checksum.zc_word[3]); 522 break; 523 } 524 #undef DO64 525 #undef DO32 526 } 527 528 static int 529 restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro) 530 { 531 int err; 532 dmu_tx_t *tx; 533 534 err = dmu_object_info(os, drro->drr_object, NULL); 535 536 if (err != 0 && err != ENOENT) 537 return (EINVAL); 538 539 if (drro->drr_type == DMU_OT_NONE || 540 drro->drr_type >= DMU_OT_NUMTYPES || 541 drro->drr_bonustype >= DMU_OT_NUMTYPES || 542 drro->drr_checksum >= ZIO_CHECKSUM_FUNCTIONS || 543 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS || 544 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) || 545 drro->drr_blksz < SPA_MINBLOCKSIZE || 546 drro->drr_blksz > SPA_MAXBLOCKSIZE || 547 drro->drr_bonuslen > DN_MAX_BONUSLEN) { 548 return (EINVAL); 549 } 550 551 tx = dmu_tx_create(os); 552 553 if (err == ENOENT) { 554 /* currently free, want to be allocated */ 555 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); 556 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0, 1); 557 err = dmu_tx_assign(tx, TXG_WAIT); 558 if (err) { 559 dmu_tx_abort(tx); 560 return (err); 561 } 562 err = dmu_object_claim(os, drro->drr_object, 563 drro->drr_type, drro->drr_blksz, 564 drro->drr_bonustype, drro->drr_bonuslen, tx); 565 } else { 566 /* currently allocated, want to be allocated */ 567 dmu_tx_hold_bonus(tx, drro->drr_object); 568 /* 569 * We may change blocksize, so need to 570 * hold_write 571 */ 572 dmu_tx_hold_write(tx, drro->drr_object, 0, 1); 573 err = dmu_tx_assign(tx, TXG_WAIT); 574 if (err) { 575 dmu_tx_abort(tx); 576 return (err); 577 } 578 579 err = dmu_object_reclaim(os, drro->drr_object, 580 drro->drr_type, drro->drr_blksz, 581 drro->drr_bonustype, drro->drr_bonuslen, tx); 582 } 583 if (err) { 584 dmu_tx_commit(tx); 585 return (EINVAL); 586 } 587 588 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksum, tx); 589 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx); 590 591 if (drro->drr_bonuslen) { 592 dmu_buf_t *db; 593 void *data; 594 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db)); 595 dmu_buf_will_dirty(db, tx); 596 597 ASSERT3U(db->db_size, ==, drro->drr_bonuslen); 598 data = restore_read(ra, P2ROUNDUP(db->db_size, 8)); 599 if (data == NULL) { 600 dmu_tx_commit(tx); 601 return (ra->err); 602 } 603 bcopy(data, db->db_data, db->db_size); 604 if (ra->byteswap) { 605 dmu_ot[drro->drr_bonustype].ot_byteswap(db->db_data, 606 drro->drr_bonuslen); 607 } 608 dmu_buf_rele(db, FTAG); 609 } 610 dmu_tx_commit(tx); 611 return (0); 612 } 613 614 /* ARGSUSED */ 615 static int 616 restore_freeobjects(struct restorearg *ra, objset_t *os, 617 struct drr_freeobjects *drrfo) 618 { 619 uint64_t obj; 620 621 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj) 622 return (EINVAL); 623 624 for (obj = drrfo->drr_firstobj; 625 obj < drrfo->drr_firstobj + drrfo->drr_numobjs; 626 (void) dmu_object_next(os, &obj, FALSE, 0)) { 627 dmu_tx_t *tx; 628 int err; 629 630 if (dmu_object_info(os, obj, NULL) != 0) 631 continue; 632 633 tx = dmu_tx_create(os); 634 dmu_tx_hold_bonus(tx, obj); 635 err = dmu_tx_assign(tx, TXG_WAIT); 636 if (err) { 637 dmu_tx_abort(tx); 638 return (err); 639 } 640 err = dmu_object_free(os, obj, tx); 641 dmu_tx_commit(tx); 642 if (err && err != ENOENT) 643 return (EINVAL); 644 } 645 return (0); 646 } 647 648 static int 649 restore_write(struct restorearg *ra, objset_t *os, 650 struct drr_write *drrw) 651 { 652 dmu_tx_t *tx; 653 void *data; 654 int err; 655 656 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset || 657 drrw->drr_type >= DMU_OT_NUMTYPES) 658 return (EINVAL); 659 660 data = restore_read(ra, drrw->drr_length); 661 if (data == NULL) 662 return (ra->err); 663 664 if (dmu_object_info(os, drrw->drr_object, NULL) != 0) 665 return (EINVAL); 666 667 tx = dmu_tx_create(os); 668 669 dmu_tx_hold_write(tx, drrw->drr_object, 670 drrw->drr_offset, drrw->drr_length); 671 err = dmu_tx_assign(tx, TXG_WAIT); 672 if (err) { 673 dmu_tx_abort(tx); 674 return (err); 675 } 676 if (ra->byteswap) 677 dmu_ot[drrw->drr_type].ot_byteswap(data, drrw->drr_length); 678 dmu_write(os, drrw->drr_object, 679 drrw->drr_offset, drrw->drr_length, data, tx); 680 dmu_tx_commit(tx); 681 return (0); 682 } 683 684 /* ARGSUSED */ 685 static int 686 restore_free(struct restorearg *ra, objset_t *os, 687 struct drr_free *drrf) 688 { 689 dmu_tx_t *tx; 690 int err; 691 692 if (drrf->drr_length != -1ULL && 693 drrf->drr_offset + drrf->drr_length < drrf->drr_offset) 694 return (EINVAL); 695 696 if (dmu_object_info(os, drrf->drr_object, NULL) != 0) 697 return (EINVAL); 698 699 tx = dmu_tx_create(os); 700 701 dmu_tx_hold_free(tx, drrf->drr_object, 702 drrf->drr_offset, drrf->drr_length); 703 err = dmu_tx_assign(tx, TXG_WAIT); 704 if (err) { 705 dmu_tx_abort(tx); 706 return (err); 707 } 708 err = dmu_free_range(os, drrf->drr_object, 709 drrf->drr_offset, drrf->drr_length, tx); 710 dmu_tx_commit(tx); 711 return (err); 712 } 713 714 int 715 dmu_recvbackup(char *tosnap, struct drr_begin *drrb, uint64_t *sizep, 716 boolean_t force, vnode_t *vp, uint64_t voffset) 717 { 718 struct restorearg ra; 719 dmu_replay_record_t *drr; 720 char *cp; 721 objset_t *os = NULL; 722 zio_cksum_t pzc; 723 724 bzero(&ra, sizeof (ra)); 725 ra.vp = vp; 726 ra.voff = voffset; 727 ra.bufsize = 1<<20; 728 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP); 729 730 if (drrb->drr_magic == DMU_BACKUP_MAGIC) { 731 ra.byteswap = FALSE; 732 } else if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC)) { 733 ra.byteswap = TRUE; 734 } else { 735 ra.err = EINVAL; 736 goto out; 737 } 738 739 /* 740 * NB: this assumes that struct drr_begin will be the largest in 741 * dmu_replay_record_t's drr_u, and thus we don't need to pad it 742 * with zeros to make it the same length as we wrote out. 743 */ 744 ((dmu_replay_record_t *)ra.buf)->drr_type = DRR_BEGIN; 745 ((dmu_replay_record_t *)ra.buf)->drr_pad = 0; 746 ((dmu_replay_record_t *)ra.buf)->drr_u.drr_begin = *drrb; 747 if (ra.byteswap) { 748 fletcher_4_incremental_byteswap(ra.buf, 749 sizeof (dmu_replay_record_t), &ra.zc); 750 } else { 751 fletcher_4_incremental_native(ra.buf, 752 sizeof (dmu_replay_record_t), &ra.zc); 753 } 754 (void) strcpy(drrb->drr_toname, tosnap); /* for the sync funcs */ 755 756 if (ra.byteswap) { 757 drrb->drr_magic = BSWAP_64(drrb->drr_magic); 758 drrb->drr_version = BSWAP_64(drrb->drr_version); 759 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time); 760 drrb->drr_type = BSWAP_32(drrb->drr_type); 761 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid); 762 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid); 763 } 764 765 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC); 766 767 if (drrb->drr_version != DMU_BACKUP_VERSION || 768 drrb->drr_type >= DMU_OST_NUMTYPES || 769 strchr(drrb->drr_toname, '@') == NULL) { 770 ra.err = EINVAL; 771 goto out; 772 } 773 774 /* 775 * Process the begin in syncing context. 776 */ 777 if (drrb->drr_fromguid) { 778 /* incremental backup */ 779 dsl_dataset_t *ds = NULL; 780 781 cp = strchr(tosnap, '@'); 782 *cp = '\0'; 783 ra.err = dsl_dataset_open(tosnap, DS_MODE_EXCLUSIVE, FTAG, &ds); 784 *cp = '@'; 785 if (ra.err) 786 goto out; 787 788 /* 789 * Only do the rollback if the most recent snapshot 790 * matches the incremental source 791 */ 792 if (force) { 793 if (ds->ds_prev == NULL || 794 ds->ds_prev->ds_phys->ds_guid != 795 drrb->drr_fromguid) { 796 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 797 return (ENODEV); 798 } 799 (void) dsl_dataset_rollback(ds); 800 } 801 ra.err = dsl_sync_task_do(ds->ds_dir->dd_pool, 802 replay_incremental_check, replay_incremental_sync, 803 ds, drrb, 1); 804 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 805 } else { 806 /* full backup */ 807 dsl_dir_t *dd = NULL; 808 const char *tail; 809 810 /* can't restore full backup into topmost fs, for now */ 811 if (strrchr(drrb->drr_toname, '/') == NULL) { 812 ra.err = EINVAL; 813 goto out; 814 } 815 816 cp = strchr(tosnap, '@'); 817 *cp = '\0'; 818 ra.err = dsl_dir_open(tosnap, FTAG, &dd, &tail); 819 *cp = '@'; 820 if (ra.err) 821 goto out; 822 if (tail == NULL) { 823 ra.err = EEXIST; 824 goto out; 825 } 826 827 ra.err = dsl_sync_task_do(dd->dd_pool, replay_full_check, 828 replay_full_sync, dd, drrb, 5); 829 dsl_dir_close(dd, FTAG); 830 } 831 if (ra.err) 832 goto out; 833 834 /* 835 * Open the objset we are modifying. 836 */ 837 838 cp = strchr(tosnap, '@'); 839 *cp = '\0'; 840 ra.err = dmu_objset_open(tosnap, DMU_OST_ANY, 841 DS_MODE_PRIMARY | DS_MODE_INCONSISTENT, &os); 842 *cp = '@'; 843 ASSERT3U(ra.err, ==, 0); 844 845 /* 846 * Read records and process them. 847 */ 848 pzc = ra.zc; 849 while (ra.err == 0 && 850 NULL != (drr = restore_read(&ra, sizeof (*drr)))) { 851 if (issig(JUSTLOOKING) && issig(FORREAL)) { 852 ra.err = EINTR; 853 goto out; 854 } 855 856 if (ra.byteswap) 857 backup_byteswap(drr); 858 859 switch (drr->drr_type) { 860 case DRR_OBJECT: 861 { 862 /* 863 * We need to make a copy of the record header, 864 * because restore_{object,write} may need to 865 * restore_read(), which will invalidate drr. 866 */ 867 struct drr_object drro = drr->drr_u.drr_object; 868 ra.err = restore_object(&ra, os, &drro); 869 break; 870 } 871 case DRR_FREEOBJECTS: 872 { 873 struct drr_freeobjects drrfo = 874 drr->drr_u.drr_freeobjects; 875 ra.err = restore_freeobjects(&ra, os, &drrfo); 876 break; 877 } 878 case DRR_WRITE: 879 { 880 struct drr_write drrw = drr->drr_u.drr_write; 881 ra.err = restore_write(&ra, os, &drrw); 882 break; 883 } 884 case DRR_FREE: 885 { 886 struct drr_free drrf = drr->drr_u.drr_free; 887 ra.err = restore_free(&ra, os, &drrf); 888 break; 889 } 890 case DRR_END: 891 { 892 struct drr_end drre = drr->drr_u.drr_end; 893 /* 894 * We compare against the *previous* checksum 895 * value, because the stored checksum is of 896 * everything before the DRR_END record. 897 */ 898 if (drre.drr_checksum.zc_word[0] != 0 && 899 !ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pzc)) { 900 ra.err = ECKSUM; 901 goto out; 902 } 903 904 ra.err = dsl_sync_task_do(dmu_objset_ds(os)-> 905 ds_dir->dd_pool, replay_end_check, replay_end_sync, 906 os, drrb, 3); 907 goto out; 908 } 909 default: 910 ra.err = EINVAL; 911 goto out; 912 } 913 pzc = ra.zc; 914 } 915 916 out: 917 if (os) 918 dmu_objset_close(os); 919 920 /* 921 * Make sure we don't rollback/destroy unless we actually 922 * processed the begin properly. 'os' will only be set if this 923 * is the case. 924 */ 925 if (ra.err && os && tosnap && strchr(tosnap, '@')) { 926 /* 927 * rollback or destroy what we created, so we don't 928 * leave it in the restoring state. 929 */ 930 dsl_dataset_t *ds; 931 int err; 932 933 cp = strchr(tosnap, '@'); 934 *cp = '\0'; 935 err = dsl_dataset_open(tosnap, 936 DS_MODE_EXCLUSIVE | DS_MODE_INCONSISTENT, 937 FTAG, &ds); 938 if (err == 0) { 939 txg_wait_synced(ds->ds_dir->dd_pool, 0); 940 if (drrb->drr_fromguid) { 941 /* incremental: rollback to most recent snap */ 942 (void) dsl_dataset_rollback(ds); 943 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 944 } else { 945 /* full: destroy whole fs */ 946 dsl_dataset_close(ds, DS_MODE_EXCLUSIVE, FTAG); 947 (void) dsl_dataset_destroy(tosnap); 948 } 949 } 950 *cp = '@'; 951 } 952 953 kmem_free(ra.buf, ra.bufsize); 954 if (sizep) 955 *sizep = ra.voff; 956 return (ra.err); 957 } 958