445{
446 dmu_sendarg_t *dsp = arg;
447 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
448 int err = 0;
449
450 if (issig(JUSTLOOKING) && issig(FORREAL))
451 return (SET_ERROR(EINTR));
452
453 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
454 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
455 return (0);
456 } else if (zb->zb_level == ZB_ZIL_LEVEL) {
457 /*
458 * If we are sending a non-snapshot (which is allowed on
459 * read-only pools), it may have a ZIL, which must be ignored.
460 */
461 return (0);
462 } else if (BP_IS_HOLE(bp) &&
463 zb->zb_object == DMU_META_DNODE_OBJECT) {
464 uint64_t span = BP_SPAN(dnp, zb->zb_level);
465 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
466 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
467 } else if (BP_IS_HOLE(bp)) {
468 uint64_t span = BP_SPAN(dnp, zb->zb_level);
469 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
470 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
471 return (0);
472 } else if (type == DMU_OT_DNODE) {
473 dnode_phys_t *blk;
474 int i;
475 int blksz = BP_GET_LSIZE(bp);
476 uint32_t aflags = ARC_WAIT;
477 arc_buf_t *abuf;
478
479 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
480 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
481 &aflags, zb) != 0)
482 return (SET_ERROR(EIO));
483
484 blk = abuf->b_data;
485 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
486 uint64_t dnobj = (zb->zb_blkid <<
487 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
488 err = dump_dnode(dsp, dnobj, blk+i);
489 if (err != 0)
490 break;
491 }
492 (void) arc_buf_remove_ref(abuf, &abuf);
493 } else if (type == DMU_OT_SA) {
494 uint32_t aflags = ARC_WAIT;
495 arc_buf_t *abuf;
496 int blksz = BP_GET_LSIZE(bp);
497
498 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
499 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
500 &aflags, zb) != 0)
501 return (SET_ERROR(EIO));
502
503 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
504 (void) arc_buf_remove_ref(abuf, &abuf);
505 } else if (backup_do_embed(dsp, bp)) {
506 /* it's an embedded level-0 block of a regular object */
507 int blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
508 err = dump_write_embedded(dsp, zb->zb_object,
509 zb->zb_blkid * blksz, blksz, bp);
510 } else { /* it's a level-0 block of a regular object */
511 uint32_t aflags = ARC_WAIT;
512 arc_buf_t *abuf;
513 int blksz = BP_GET_LSIZE(bp);
514
515 ASSERT3U(blksz, ==, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
516 ASSERT0(zb->zb_level);
517 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
518 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
519 &aflags, zb) != 0) {
520 if (zfs_send_corrupt_data) {
521 /* Send a block filled with 0x"zfs badd bloc" */
522 abuf = arc_buf_alloc(spa, blksz, &abuf,
523 ARC_BUFC_DATA);
524 uint64_t *ptr;
525 for (ptr = abuf->b_data;
526 (char *)ptr < (char *)abuf->b_data + blksz;
527 ptr++)
528 *ptr = 0x2f5baddb10c;
529 } else {
530 return (SET_ERROR(EIO));
531 }
532 }
533
534 err = dump_write(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
535 blksz, bp, abuf->b_data);
536 (void) arc_buf_remove_ref(abuf, &abuf);
537 }
538
539 ASSERT(err == 0 || err == EINTR);
540 return (err);
541}
542
543/*
544 * Releases dp using the specified tag.
545 */
546static int
547dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
548 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, boolean_t embedok,
549#ifdef illumos
550 int outfd, vnode_t *vp, offset_t *off)
551#else
552 int outfd, struct file *fp, offset_t *off)
553#endif
554{
555 objset_t *os;
556 dmu_replay_record_t *drr;
557 dmu_sendarg_t *dsp;
558 int err;
559 uint64_t fromtxg = 0;
560 uint64_t featureflags = 0;
561
562 err = dmu_objset_from_ds(ds, &os);
563 if (err != 0) {
564 dsl_pool_rele(dp, tag);
565 return (err);
566 }
567
568 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
569 drr->drr_type = DRR_BEGIN;
570 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
571 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
572 DMU_SUBSTREAM);
573
574#ifdef _KERNEL
575 if (dmu_objset_type(os) == DMU_OST_ZFS) {
576 uint64_t version;
577 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
578 kmem_free(drr, sizeof (dmu_replay_record_t));
579 dsl_pool_rele(dp, tag);
580 return (SET_ERROR(EINVAL));
581 }
582 if (version >= ZPL_VERSION_SA) {
583 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
584 }
585 }
586#endif
587
588 if (embedok &&
589 spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) {
590 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA;
591 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
592 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4;
593 } else {
594 embedok = B_FALSE;
595 }
596
597 DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo,
598 featureflags);
599
600 drr->drr_u.drr_begin.drr_creation_time =
601 ds->ds_phys->ds_creation_time;
602 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
603 if (is_clone)
604 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
605 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
606 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
607 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
608
609 if (fromzb != NULL) {
610 drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid;
611 fromtxg = fromzb->zbm_creation_txg;
612 }
613 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
614 if (!dsl_dataset_is_snapshot(ds)) {
615 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--",
616 sizeof (drr->drr_u.drr_begin.drr_toname));
617 }
618
619 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
620
621 dsp->dsa_drr = drr;
622 dsp->dsa_outfd = outfd;
623 dsp->dsa_proc = curproc;
624 dsp->dsa_td = curthread;
625 dsp->dsa_fp = fp;
626 dsp->dsa_os = os;
627 dsp->dsa_off = off;
628 dsp->dsa_toguid = ds->ds_phys->ds_guid;
629 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
630 dsp->dsa_pending_op = PENDING_NONE;
631 dsp->dsa_incremental = (fromzb != NULL);
632 dsp->dsa_featureflags = featureflags;
633
634 mutex_enter(&ds->ds_sendstream_lock);
635 list_insert_head(&ds->ds_sendstreams, dsp);
636 mutex_exit(&ds->ds_sendstream_lock);
637
638 dsl_dataset_long_hold(ds, FTAG);
639 dsl_pool_rele(dp, tag);
640
641 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
642 err = dsp->dsa_err;
643 goto out;
644 }
645
646 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
647 backup_cb, dsp);
648
649 if (dsp->dsa_pending_op != PENDING_NONE)
650 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
651 err = SET_ERROR(EINTR);
652
653 if (err != 0) {
654 if (err == EINTR && dsp->dsa_err != 0)
655 err = dsp->dsa_err;
656 goto out;
657 }
658
659 bzero(drr, sizeof (dmu_replay_record_t));
660 drr->drr_type = DRR_END;
661 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
662 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
663
664 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
665 err = dsp->dsa_err;
666 goto out;
667 }
668
669out:
670 mutex_enter(&ds->ds_sendstream_lock);
671 list_remove(&ds->ds_sendstreams, dsp);
672 mutex_exit(&ds->ds_sendstream_lock);
673
674 kmem_free(drr, sizeof (dmu_replay_record_t));
675 kmem_free(dsp, sizeof (dmu_sendarg_t));
676
677 dsl_dataset_long_rele(ds, FTAG);
678
679 return (err);
680}
681
682int
683dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
684#ifdef illumos
685 boolean_t embedok, int outfd, vnode_t *vp, offset_t *off)
686#else
687 boolean_t embedok, int outfd, struct file *fp, offset_t *off)
688#endif
689{
690 dsl_pool_t *dp;
691 dsl_dataset_t *ds;
692 dsl_dataset_t *fromds = NULL;
693 int err;
694
695 err = dsl_pool_hold(pool, FTAG, &dp);
696 if (err != 0)
697 return (err);
698
699 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
700 if (err != 0) {
701 dsl_pool_rele(dp, FTAG);
702 return (err);
703 }
704
705 if (fromsnap != 0) {
706 zfs_bookmark_phys_t zb;
707 boolean_t is_clone;
708
709 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
710 if (err != 0) {
711 dsl_dataset_rele(ds, FTAG);
712 dsl_pool_rele(dp, FTAG);
713 return (err);
714 }
715 if (!dsl_dataset_is_before(ds, fromds, 0))
716 err = SET_ERROR(EXDEV);
717 zb.zbm_creation_time = fromds->ds_phys->ds_creation_time;
718 zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg;
719 zb.zbm_guid = fromds->ds_phys->ds_guid;
720 is_clone = (fromds->ds_dir != ds->ds_dir);
721 dsl_dataset_rele(fromds, FTAG);
722 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
723 outfd, fp, off);
724 } else {
725 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
726 outfd, fp, off);
727 }
728 dsl_dataset_rele(ds, FTAG);
729 return (err);
730}
731
732int
733dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok,
734#ifdef illumos
735 int outfd, vnode_t *vp, offset_t *off)
736#else
737 int outfd, struct file *fp, offset_t *off)
738#endif
739{
740 dsl_pool_t *dp;
741 dsl_dataset_t *ds;
742 int err;
743 boolean_t owned = B_FALSE;
744
745 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL)
746 return (SET_ERROR(EINVAL));
747
748 err = dsl_pool_hold(tosnap, FTAG, &dp);
749 if (err != 0)
750 return (err);
751
752 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) {
753 /*
754 * We are sending a filesystem or volume. Ensure
755 * that it doesn't change by owning the dataset.
756 */
757 err = dsl_dataset_own(dp, tosnap, FTAG, &ds);
758 owned = B_TRUE;
759 } else {
760 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
761 }
762 if (err != 0) {
763 dsl_pool_rele(dp, FTAG);
764 return (err);
765 }
766
767 if (fromsnap != NULL) {
768 zfs_bookmark_phys_t zb;
769 boolean_t is_clone = B_FALSE;
770 int fsnamelen = strchr(tosnap, '@') - tosnap;
771
772 /*
773 * If the fromsnap is in a different filesystem, then
774 * mark the send stream as a clone.
775 */
776 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 ||
777 (fromsnap[fsnamelen] != '@' &&
778 fromsnap[fsnamelen] != '#')) {
779 is_clone = B_TRUE;
780 }
781
782 if (strchr(fromsnap, '@')) {
783 dsl_dataset_t *fromds;
784 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
785 if (err == 0) {
786 if (!dsl_dataset_is_before(ds, fromds, 0))
787 err = SET_ERROR(EXDEV);
788 zb.zbm_creation_time =
789 fromds->ds_phys->ds_creation_time;
790 zb.zbm_creation_txg =
791 fromds->ds_phys->ds_creation_txg;
792 zb.zbm_guid = fromds->ds_phys->ds_guid;
793 is_clone = (ds->ds_dir != fromds->ds_dir);
794 dsl_dataset_rele(fromds, FTAG);
795 }
796 } else {
797 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb);
798 }
799 if (err != 0) {
800 dsl_dataset_rele(ds, FTAG);
801 dsl_pool_rele(dp, FTAG);
802 return (err);
803 }
804 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
805 outfd, fp, off);
806 } else {
807 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
808 outfd, fp, off);
809 }
810 if (owned)
811 dsl_dataset_disown(ds, FTAG);
812 else
813 dsl_dataset_rele(ds, FTAG);
814 return (err);
815}
816
817int
818dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
819{
820 dsl_pool_t *dp = ds->ds_dir->dd_pool;
821 int err;
822 uint64_t size;
823
824 ASSERT(dsl_pool_config_held(dp));
825
826 /* tosnap must be a snapshot */
827 if (!dsl_dataset_is_snapshot(ds))
828 return (SET_ERROR(EINVAL));
829
830 /*
831 * fromsnap must be an earlier snapshot from the same fs as tosnap,
832 * or the origin's fs.
833 */
834 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0))
835 return (SET_ERROR(EXDEV));
836
837 /* Get uncompressed size estimate of changed data. */
838 if (fromds == NULL) {
839 size = ds->ds_phys->ds_uncompressed_bytes;
840 } else {
841 uint64_t used, comp;
842 err = dsl_dataset_space_written(fromds, ds,
843 &used, &comp, &size);
844 if (err != 0)
845 return (err);
846 }
847
848 /*
849 * Assume that space (both on-disk and in-stream) is dominated by
850 * data. We will adjust for indirect blocks and the copies property,
851 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
852 */
853
854 /*
855 * Subtract out approximate space used by indirect blocks.
856 * Assume most space is used by data blocks (non-indirect, non-dnode).
857 * Assume all blocks are recordsize. Assume ditto blocks and
858 * internal fragmentation counter out compression.
859 *
860 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
861 * block, which we observe in practice.
862 */
863 uint64_t recordsize;
864 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
865 if (err != 0)
866 return (err);
867 size -= size / recordsize * sizeof (blkptr_t);
868
869 /* Add in the space for the record associated with each block. */
870 size += size / recordsize * sizeof (dmu_replay_record_t);
871
872 *sizep = size;
873
874 return (0);
875}
876
877typedef struct dmu_recv_begin_arg {
878 const char *drba_origin;
879 dmu_recv_cookie_t *drba_cookie;
880 cred_t *drba_cred;
881 uint64_t drba_snapobj;
882} dmu_recv_begin_arg_t;
883
884static int
885recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
886 uint64_t fromguid)
887{
888 uint64_t val;
889 int error;
890 dsl_pool_t *dp = ds->ds_dir->dd_pool;
891
892 /* temporary clone name must not exist */
893 error = zap_lookup(dp->dp_meta_objset,
894 ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
895 8, 1, &val);
896 if (error != ENOENT)
897 return (error == 0 ? EBUSY : error);
898
899 /* new snapshot name must not exist */
900 error = zap_lookup(dp->dp_meta_objset,
901 ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap,
902 8, 1, &val);
903 if (error != ENOENT)
904 return (error == 0 ? EEXIST : error);
905
906 /*
907 * Check snapshot limit before receiving. We'll recheck again at the
908 * end, but might as well abort before receiving if we're already over
909 * the limit.
910 *
911 * Note that we do not check the file system limit with
912 * dsl_dir_fscount_check because the temporary %clones don't count
913 * against that limit.
914 */
915 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT,
916 NULL, drba->drba_cred);
917 if (error != 0)
918 return (error);
919
920 if (fromguid != 0) {
921 dsl_dataset_t *snap;
922 uint64_t obj = ds->ds_phys->ds_prev_snap_obj;
923
924 /* Find snapshot in this dir that matches fromguid. */
925 while (obj != 0) {
926 error = dsl_dataset_hold_obj(dp, obj, FTAG,
927 &snap);
928 if (error != 0)
929 return (SET_ERROR(ENODEV));
930 if (snap->ds_dir != ds->ds_dir) {
931 dsl_dataset_rele(snap, FTAG);
932 return (SET_ERROR(ENODEV));
933 }
934 if (snap->ds_phys->ds_guid == fromguid)
935 break;
936 obj = snap->ds_phys->ds_prev_snap_obj;
937 dsl_dataset_rele(snap, FTAG);
938 }
939 if (obj == 0)
940 return (SET_ERROR(ENODEV));
941
942 if (drba->drba_cookie->drc_force) {
943 drba->drba_snapobj = obj;
944 } else {
945 /*
946 * If we are not forcing, there must be no
947 * changes since fromsnap.
948 */
949 if (dsl_dataset_modified_since_snap(ds, snap)) {
950 dsl_dataset_rele(snap, FTAG);
951 return (SET_ERROR(ETXTBSY));
952 }
953 drba->drba_snapobj = ds->ds_prev->ds_object;
954 }
955
956 dsl_dataset_rele(snap, FTAG);
957 } else {
958 /* if full, most recent snapshot must be $ORIGIN */
959 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
960 return (SET_ERROR(ENODEV));
961 drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj;
962 }
963
964 return (0);
965
966}
967
968static int
969dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
970{
971 dmu_recv_begin_arg_t *drba = arg;
972 dsl_pool_t *dp = dmu_tx_pool(tx);
973 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
974 uint64_t fromguid = drrb->drr_fromguid;
975 int flags = drrb->drr_flags;
976 int error;
977 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
978 dsl_dataset_t *ds;
979 const char *tofs = drba->drba_cookie->drc_tofs;
980
981 /* already checked */
982 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
983
984 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
985 DMU_COMPOUNDSTREAM ||
986 drrb->drr_type >= DMU_OST_NUMTYPES ||
987 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
988 return (SET_ERROR(EINVAL));
989
990 /* Verify pool version supports SA if SA_SPILL feature set */
991 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
992 spa_version(dp->dp_spa) < SPA_VERSION_SA)
993 return (SET_ERROR(ENOTSUP));
994
995 /*
996 * The receiving code doesn't know how to translate a WRITE_EMBEDDED
997 * record to a plan WRITE record, so the pool must have the
998 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED
999 * records. Same with WRITE_EMBEDDED records that use LZ4 compression.
1000 */
1001 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) &&
1002 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA))
1003 return (SET_ERROR(ENOTSUP));
1004 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) &&
1005 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
1006 return (SET_ERROR(ENOTSUP));
1007
1008 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
1009 if (error == 0) {
1010 /* target fs already exists; recv into temp clone */
1011
1012 /* Can't recv a clone into an existing fs */
1013 if (flags & DRR_FLAG_CLONE) {
1014 dsl_dataset_rele(ds, FTAG);
1015 return (SET_ERROR(EINVAL));
1016 }
1017
1018 error = recv_begin_check_existing_impl(drba, ds, fromguid);
1019 dsl_dataset_rele(ds, FTAG);
1020 } else if (error == ENOENT) {
1021 /* target fs does not exist; must be a full backup or clone */
1022 char buf[MAXNAMELEN];
1023
1024 /*
1025 * If it's a non-clone incremental, we are missing the
1026 * target fs, so fail the recv.
1027 */
1028 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
1029 return (SET_ERROR(ENOENT));
1030
1031 /* Open the parent of tofs */
1032 ASSERT3U(strlen(tofs), <, MAXNAMELEN);
1033 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
1034 error = dsl_dataset_hold(dp, buf, FTAG, &ds);
1035 if (error != 0)
1036 return (error);
1037
1038 /*
1039 * Check filesystem and snapshot limits before receiving. We'll
1040 * recheck snapshot limits again at the end (we create the
1041 * filesystems and increment those counts during begin_sync).
1042 */
1043 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
1044 ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred);
1045 if (error != 0) {
1046 dsl_dataset_rele(ds, FTAG);
1047 return (error);
1048 }
1049
1050 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
1051 ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred);
1052 if (error != 0) {
1053 dsl_dataset_rele(ds, FTAG);
1054 return (error);
1055 }
1056
1057 if (drba->drba_origin != NULL) {
1058 dsl_dataset_t *origin;
1059 error = dsl_dataset_hold(dp, drba->drba_origin,
1060 FTAG, &origin);
1061 if (error != 0) {
1062 dsl_dataset_rele(ds, FTAG);
1063 return (error);
1064 }
1065 if (!dsl_dataset_is_snapshot(origin)) {
1066 dsl_dataset_rele(origin, FTAG);
1067 dsl_dataset_rele(ds, FTAG);
1068 return (SET_ERROR(EINVAL));
1069 }
1070 if (origin->ds_phys->ds_guid != fromguid) {
1071 dsl_dataset_rele(origin, FTAG);
1072 dsl_dataset_rele(ds, FTAG);
1073 return (SET_ERROR(ENODEV));
1074 }
1075 dsl_dataset_rele(origin, FTAG);
1076 }
1077 dsl_dataset_rele(ds, FTAG);
1078 error = 0;
1079 }
1080 return (error);
1081}
1082
1083static void
1084dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
1085{
1086 dmu_recv_begin_arg_t *drba = arg;
1087 dsl_pool_t *dp = dmu_tx_pool(tx);
1088 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
1089 const char *tofs = drba->drba_cookie->drc_tofs;
1090 dsl_dataset_t *ds, *newds;
1091 uint64_t dsobj;
1092 int error;
1093 uint64_t crflags;
1094
1095 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
1096 DS_FLAG_CI_DATASET : 0;
1097
1098 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
1099 if (error == 0) {
1100 /* create temporary clone */
1101 dsl_dataset_t *snap = NULL;
1102 if (drba->drba_snapobj != 0) {
1103 VERIFY0(dsl_dataset_hold_obj(dp,
1104 drba->drba_snapobj, FTAG, &snap));
1105 }
1106 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
1107 snap, crflags, drba->drba_cred, tx);
1108 dsl_dataset_rele(snap, FTAG);
1109 dsl_dataset_rele(ds, FTAG);
1110 } else {
1111 dsl_dir_t *dd;
1112 const char *tail;
1113 dsl_dataset_t *origin = NULL;
1114
1115 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
1116
1117 if (drba->drba_origin != NULL) {
1118 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
1119 FTAG, &origin));
1120 }
1121
1122 /* Create new dataset. */
1123 dsobj = dsl_dataset_create_sync(dd,
1124 strrchr(tofs, '/') + 1,
1125 origin, crflags, drba->drba_cred, tx);
1126 if (origin != NULL)
1127 dsl_dataset_rele(origin, FTAG);
1128 dsl_dir_rele(dd, FTAG);
1129 drba->drba_cookie->drc_newfs = B_TRUE;
1130 }
1131 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
1132
1133 dmu_buf_will_dirty(newds->ds_dbuf, tx);
1134 newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
1135
1136 /*
1137 * If we actually created a non-clone, we need to create the
1138 * objset in our new dataset.
1139 */
1140 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
1141 (void) dmu_objset_create_impl(dp->dp_spa,
1142 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
1143 }
1144
1145 drba->drba_cookie->drc_ds = newds;
1146
1147 spa_history_log_internal_ds(newds, "receive", tx, "");
1148}
1149
1150/*
1151 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
1152 * succeeds; otherwise we will leak the holds on the datasets.
1153 */
1154int
1155dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
1156 boolean_t force, char *origin, dmu_recv_cookie_t *drc)
1157{
1158 dmu_recv_begin_arg_t drba = { 0 };
1159 dmu_replay_record_t *drr;
1160
1161 bzero(drc, sizeof (dmu_recv_cookie_t));
1162 drc->drc_drrb = drrb;
1163 drc->drc_tosnap = tosnap;
1164 drc->drc_tofs = tofs;
1165 drc->drc_force = force;
1166 drc->drc_cred = CRED();
1167
1168 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1169 drc->drc_byteswap = B_TRUE;
1170 else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
1171 return (SET_ERROR(EINVAL));
1172
1173 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1174 drr->drr_type = DRR_BEGIN;
1175 drr->drr_u.drr_begin = *drc->drc_drrb;
1176 if (drc->drc_byteswap) {
1177 fletcher_4_incremental_byteswap(drr,
1178 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1179 } else {
1180 fletcher_4_incremental_native(drr,
1181 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1182 }
1183 kmem_free(drr, sizeof (dmu_replay_record_t));
1184
1185 if (drc->drc_byteswap) {
1186 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1187 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1188 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1189 drrb->drr_type = BSWAP_32(drrb->drr_type);
1190 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1191 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1192 }
1193
1194 drba.drba_origin = origin;
1195 drba.drba_cookie = drc;
1196 drba.drba_cred = CRED();
1197
1198 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
1199 &drba, 5));
1200}
1201
1202struct restorearg {
1203 int err;
1204 boolean_t byteswap;
1205 kthread_t *td;
1206 struct file *fp;
1207 char *buf;
1208 uint64_t voff;
1209 int bufsize; /* amount of memory allocated for buf */
1210 zio_cksum_t cksum;
1211 avl_tree_t *guid_to_ds_map;
1212};
1213
1214typedef struct guid_map_entry {
1215 uint64_t guid;
1216 dsl_dataset_t *gme_ds;
1217 avl_node_t avlnode;
1218} guid_map_entry_t;
1219
1220static int
1221guid_compare(const void *arg1, const void *arg2)
1222{
1223 const guid_map_entry_t *gmep1 = arg1;
1224 const guid_map_entry_t *gmep2 = arg2;
1225
1226 if (gmep1->guid < gmep2->guid)
1227 return (-1);
1228 else if (gmep1->guid > gmep2->guid)
1229 return (1);
1230 return (0);
1231}
1232
1233static void
1234free_guid_map_onexit(void *arg)
1235{
1236 avl_tree_t *ca = arg;
1237 void *cookie = NULL;
1238 guid_map_entry_t *gmep;
1239
1240 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
1241 dsl_dataset_long_rele(gmep->gme_ds, gmep);
1242 dsl_dataset_rele(gmep->gme_ds, gmep);
1243 kmem_free(gmep, sizeof (guid_map_entry_t));
1244 }
1245 avl_destroy(ca);
1246 kmem_free(ca, sizeof (avl_tree_t));
1247}
1248
1249static int
1250restore_bytes(struct restorearg *ra, void *buf, int len, off_t off, ssize_t *resid)
1251{
1252 struct uio auio;
1253 struct iovec aiov;
1254 int error;
1255
1256 aiov.iov_base = buf;
1257 aiov.iov_len = len;
1258 auio.uio_iov = &aiov;
1259 auio.uio_iovcnt = 1;
1260 auio.uio_resid = len;
1261 auio.uio_segflg = UIO_SYSSPACE;
1262 auio.uio_rw = UIO_READ;
1263 auio.uio_offset = off;
1264 auio.uio_td = ra->td;
1265#ifdef _KERNEL
1266 error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td);
1267#else
1268 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__);
1269 error = EOPNOTSUPP;
1270#endif
1271 *resid = auio.uio_resid;
1272 return (error);
1273}
1274
1275static void *
1276restore_read(struct restorearg *ra, int len)
1277{
1278 void *rv;
1279 int done = 0;
1280
1281 /* some things will require 8-byte alignment, so everything must */
1282 ASSERT0(len % 8);
1283
1284 while (done < len) {
1285 ssize_t resid;
1286
1287 ra->err = restore_bytes(ra, (caddr_t)ra->buf + done,
1288 len - done, ra->voff, &resid);
1289
1290 if (resid == len - done)
1291 ra->err = SET_ERROR(EINVAL);
1292 ra->voff += len - done - resid;
1293 done = len - resid;
1294 if (ra->err != 0)
1295 return (NULL);
1296 }
1297
1298 ASSERT3U(done, ==, len);
1299 rv = ra->buf;
1300 if (ra->byteswap)
1301 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
1302 else
1303 fletcher_4_incremental_native(rv, len, &ra->cksum);
1304 return (rv);
1305}
1306
1307static void
1308backup_byteswap(dmu_replay_record_t *drr)
1309{
1310#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
1311#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
1312 drr->drr_type = BSWAP_32(drr->drr_type);
1313 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
1314 switch (drr->drr_type) {
1315 case DRR_BEGIN:
1316 DO64(drr_begin.drr_magic);
1317 DO64(drr_begin.drr_versioninfo);
1318 DO64(drr_begin.drr_creation_time);
1319 DO32(drr_begin.drr_type);
1320 DO32(drr_begin.drr_flags);
1321 DO64(drr_begin.drr_toguid);
1322 DO64(drr_begin.drr_fromguid);
1323 break;
1324 case DRR_OBJECT:
1325 DO64(drr_object.drr_object);
1326 DO32(drr_object.drr_type);
1327 DO32(drr_object.drr_bonustype);
1328 DO32(drr_object.drr_blksz);
1329 DO32(drr_object.drr_bonuslen);
1330 DO64(drr_object.drr_toguid);
1331 break;
1332 case DRR_FREEOBJECTS:
1333 DO64(drr_freeobjects.drr_firstobj);
1334 DO64(drr_freeobjects.drr_numobjs);
1335 DO64(drr_freeobjects.drr_toguid);
1336 break;
1337 case DRR_WRITE:
1338 DO64(drr_write.drr_object);
1339 DO32(drr_write.drr_type);
1340 DO64(drr_write.drr_offset);
1341 DO64(drr_write.drr_length);
1342 DO64(drr_write.drr_toguid);
1343 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1344 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1345 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1346 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1347 DO64(drr_write.drr_key.ddk_prop);
1348 break;
1349 case DRR_WRITE_BYREF:
1350 DO64(drr_write_byref.drr_object);
1351 DO64(drr_write_byref.drr_offset);
1352 DO64(drr_write_byref.drr_length);
1353 DO64(drr_write_byref.drr_toguid);
1354 DO64(drr_write_byref.drr_refguid);
1355 DO64(drr_write_byref.drr_refobject);
1356 DO64(drr_write_byref.drr_refoffset);
1357 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1358 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1359 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1360 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1361 DO64(drr_write_byref.drr_key.ddk_prop);
1362 break;
1363 case DRR_WRITE_EMBEDDED:
1364 DO64(drr_write_embedded.drr_object);
1365 DO64(drr_write_embedded.drr_offset);
1366 DO64(drr_write_embedded.drr_length);
1367 DO64(drr_write_embedded.drr_toguid);
1368 DO32(drr_write_embedded.drr_lsize);
1369 DO32(drr_write_embedded.drr_psize);
1370 break;
1371 case DRR_FREE:
1372 DO64(drr_free.drr_object);
1373 DO64(drr_free.drr_offset);
1374 DO64(drr_free.drr_length);
1375 DO64(drr_free.drr_toguid);
1376 break;
1377 case DRR_SPILL:
1378 DO64(drr_spill.drr_object);
1379 DO64(drr_spill.drr_length);
1380 DO64(drr_spill.drr_toguid);
1381 break;
1382 case DRR_END:
1383 DO64(drr_end.drr_checksum.zc_word[0]);
1384 DO64(drr_end.drr_checksum.zc_word[1]);
1385 DO64(drr_end.drr_checksum.zc_word[2]);
1386 DO64(drr_end.drr_checksum.zc_word[3]);
1387 DO64(drr_end.drr_toguid);
1388 break;
1389 }
1390#undef DO64
1391#undef DO32
1392}
1393
1394static int
1395restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1396{
1397 int err;
1398 dmu_tx_t *tx;
1399 void *data = NULL;
1400
1401 if (drro->drr_type == DMU_OT_NONE ||
1402 !DMU_OT_IS_VALID(drro->drr_type) ||
1403 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1404 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1405 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1406 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1407 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1408 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1409 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1410 return (SET_ERROR(EINVAL));
1411 }
1412
1413 err = dmu_object_info(os, drro->drr_object, NULL);
1414
1415 if (err != 0 && err != ENOENT)
1416 return (SET_ERROR(EINVAL));
1417
1418 if (drro->drr_bonuslen) {
1419 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1420 if (ra->err != 0)
1421 return (ra->err);
1422 }
1423
1424 if (err == ENOENT) {
1425 /* currently free, want to be allocated */
1426 tx = dmu_tx_create(os);
1427 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1428 err = dmu_tx_assign(tx, TXG_WAIT);
1429 if (err != 0) {
1430 dmu_tx_abort(tx);
1431 return (err);
1432 }
1433 err = dmu_object_claim(os, drro->drr_object,
1434 drro->drr_type, drro->drr_blksz,
1435 drro->drr_bonustype, drro->drr_bonuslen, tx);
1436 dmu_tx_commit(tx);
1437 } else {
1438 /* currently allocated, want to be allocated */
1439 err = dmu_object_reclaim(os, drro->drr_object,
1440 drro->drr_type, drro->drr_blksz,
1441 drro->drr_bonustype, drro->drr_bonuslen);
1442 }
1443 if (err != 0) {
1444 return (SET_ERROR(EINVAL));
1445 }
1446
1447 tx = dmu_tx_create(os);
1448 dmu_tx_hold_bonus(tx, drro->drr_object);
1449 err = dmu_tx_assign(tx, TXG_WAIT);
1450 if (err != 0) {
1451 dmu_tx_abort(tx);
1452 return (err);
1453 }
1454
1455 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1456 tx);
1457 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1458
1459 if (data != NULL) {
1460 dmu_buf_t *db;
1461
1462 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1463 dmu_buf_will_dirty(db, tx);
1464
1465 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1466 bcopy(data, db->db_data, drro->drr_bonuslen);
1467 if (ra->byteswap) {
1468 dmu_object_byteswap_t byteswap =
1469 DMU_OT_BYTESWAP(drro->drr_bonustype);
1470 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1471 drro->drr_bonuslen);
1472 }
1473 dmu_buf_rele(db, FTAG);
1474 }
1475 dmu_tx_commit(tx);
1476 return (0);
1477}
1478
1479/* ARGSUSED */
1480static int
1481restore_freeobjects(struct restorearg *ra, objset_t *os,
1482 struct drr_freeobjects *drrfo)
1483{
1484 uint64_t obj;
1485
1486 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1487 return (SET_ERROR(EINVAL));
1488
1489 for (obj = drrfo->drr_firstobj;
1490 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1491 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1492 int err;
1493
1494 if (dmu_object_info(os, obj, NULL) != 0)
1495 continue;
1496
1497 err = dmu_free_long_object(os, obj);
1498 if (err != 0)
1499 return (err);
1500 }
1501 return (0);
1502}
1503
1504static int
1505restore_write(struct restorearg *ra, objset_t *os,
1506 struct drr_write *drrw)
1507{
1508 dmu_tx_t *tx;
1509 void *data;
1510 int err;
1511
1512 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1513 !DMU_OT_IS_VALID(drrw->drr_type))
1514 return (SET_ERROR(EINVAL));
1515
1516 data = restore_read(ra, drrw->drr_length);
1517 if (data == NULL)
1518 return (ra->err);
1519
1520 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1521 return (SET_ERROR(EINVAL));
1522
1523 tx = dmu_tx_create(os);
1524
1525 dmu_tx_hold_write(tx, drrw->drr_object,
1526 drrw->drr_offset, drrw->drr_length);
1527 err = dmu_tx_assign(tx, TXG_WAIT);
1528 if (err != 0) {
1529 dmu_tx_abort(tx);
1530 return (err);
1531 }
1532 if (ra->byteswap) {
1533 dmu_object_byteswap_t byteswap =
1534 DMU_OT_BYTESWAP(drrw->drr_type);
1535 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1536 }
1537 dmu_write(os, drrw->drr_object,
1538 drrw->drr_offset, drrw->drr_length, data, tx);
1539 dmu_tx_commit(tx);
1540 return (0);
1541}
1542
1543/*
1544 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1545 * streams to refer to a copy of the data that is already on the
1546 * system because it came in earlier in the stream. This function
1547 * finds the earlier copy of the data, and uses that copy instead of
1548 * data from the stream to fulfill this write.
1549 */
1550static int
1551restore_write_byref(struct restorearg *ra, objset_t *os,
1552 struct drr_write_byref *drrwbr)
1553{
1554 dmu_tx_t *tx;
1555 int err;
1556 guid_map_entry_t gmesrch;
1557 guid_map_entry_t *gmep;
1558 avl_index_t where;
1559 objset_t *ref_os = NULL;
1560 dmu_buf_t *dbp;
1561
1562 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1563 return (SET_ERROR(EINVAL));
1564
1565 /*
1566 * If the GUID of the referenced dataset is different from the
1567 * GUID of the target dataset, find the referenced dataset.
1568 */
1569 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1570 gmesrch.guid = drrwbr->drr_refguid;
1571 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1572 &where)) == NULL) {
1573 return (SET_ERROR(EINVAL));
1574 }
1575 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1576 return (SET_ERROR(EINVAL));
1577 } else {
1578 ref_os = os;
1579 }
1580
1581 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1582 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
1583 if (err != 0)
1584 return (err);
1585
1586 tx = dmu_tx_create(os);
1587
1588 dmu_tx_hold_write(tx, drrwbr->drr_object,
1589 drrwbr->drr_offset, drrwbr->drr_length);
1590 err = dmu_tx_assign(tx, TXG_WAIT);
1591 if (err != 0) {
1592 dmu_tx_abort(tx);
1593 return (err);
1594 }
1595 dmu_write(os, drrwbr->drr_object,
1596 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1597 dmu_buf_rele(dbp, FTAG);
1598 dmu_tx_commit(tx);
1599 return (0);
1600}
1601
1602static int
1603restore_write_embedded(struct restorearg *ra, objset_t *os,
1604 struct drr_write_embedded *drrwnp)
1605{
1606 dmu_tx_t *tx;
1607 int err;
1608 void *data;
1609
1610 if (drrwnp->drr_offset + drrwnp->drr_length < drrwnp->drr_offset)
1611 return (EINVAL);
1612
1613 if (drrwnp->drr_psize > BPE_PAYLOAD_SIZE)
1614 return (EINVAL);
1615
1616 if (drrwnp->drr_etype >= NUM_BP_EMBEDDED_TYPES)
1617 return (EINVAL);
1618 if (drrwnp->drr_compression >= ZIO_COMPRESS_FUNCTIONS)
1619 return (EINVAL);
1620
1621 data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8));
1622 if (data == NULL)
1623 return (ra->err);
1624
1625 tx = dmu_tx_create(os);
1626
1627 dmu_tx_hold_write(tx, drrwnp->drr_object,
1628 drrwnp->drr_offset, drrwnp->drr_length);
1629 err = dmu_tx_assign(tx, TXG_WAIT);
1630 if (err != 0) {
1631 dmu_tx_abort(tx);
1632 return (err);
1633 }
1634
1635 dmu_write_embedded(os, drrwnp->drr_object,
1636 drrwnp->drr_offset, data, drrwnp->drr_etype,
1637 drrwnp->drr_compression, drrwnp->drr_lsize, drrwnp->drr_psize,
1638 ra->byteswap ^ ZFS_HOST_BYTEORDER, tx);
1639
1640 dmu_tx_commit(tx);
1641 return (0);
1642}
1643
1644static int
1645restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1646{
1647 dmu_tx_t *tx;
1648 void *data;
1649 dmu_buf_t *db, *db_spill;
1650 int err;
1651
1652 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1653 drrs->drr_length > SPA_MAXBLOCKSIZE)
1654 return (SET_ERROR(EINVAL));
1655
1656 data = restore_read(ra, drrs->drr_length);
1657 if (data == NULL)
1658 return (ra->err);
1659
1660 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1661 return (SET_ERROR(EINVAL));
1662
1663 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1664 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1665 dmu_buf_rele(db, FTAG);
1666 return (err);
1667 }
1668
1669 tx = dmu_tx_create(os);
1670
1671 dmu_tx_hold_spill(tx, db->db_object);
1672
1673 err = dmu_tx_assign(tx, TXG_WAIT);
1674 if (err != 0) {
1675 dmu_buf_rele(db, FTAG);
1676 dmu_buf_rele(db_spill, FTAG);
1677 dmu_tx_abort(tx);
1678 return (err);
1679 }
1680 dmu_buf_will_dirty(db_spill, tx);
1681
1682 if (db_spill->db_size < drrs->drr_length)
1683 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1684 drrs->drr_length, tx));
1685 bcopy(data, db_spill->db_data, drrs->drr_length);
1686
1687 dmu_buf_rele(db, FTAG);
1688 dmu_buf_rele(db_spill, FTAG);
1689
1690 dmu_tx_commit(tx);
1691 return (0);
1692}
1693
1694/* ARGSUSED */
1695static int
1696restore_free(struct restorearg *ra, objset_t *os,
1697 struct drr_free *drrf)
1698{
1699 int err;
1700
1701 if (drrf->drr_length != -1ULL &&
1702 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1703 return (SET_ERROR(EINVAL));
1704
1705 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1706 return (SET_ERROR(EINVAL));
1707
1708 err = dmu_free_long_range(os, drrf->drr_object,
1709 drrf->drr_offset, drrf->drr_length);
1710 return (err);
1711}
1712
1713/* used to destroy the drc_ds on error */
1714static void
1715dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
1716{
1717 char name[MAXNAMELEN];
1718 dsl_dataset_name(drc->drc_ds, name);
1719 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1720 (void) dsl_destroy_head(name);
1721}
1722
1723/*
1724 * NB: callers *must* call dmu_recv_end() if this succeeds.
1725 */
1726int
1727dmu_recv_stream(dmu_recv_cookie_t *drc, struct file *fp, offset_t *voffp,
1728 int cleanup_fd, uint64_t *action_handlep)
1729{
1730 struct restorearg ra = { 0 };
1731 dmu_replay_record_t *drr;
1732 objset_t *os;
1733 zio_cksum_t pcksum;
1734 int featureflags;
1735
1736 ra.byteswap = drc->drc_byteswap;
1737 ra.cksum = drc->drc_cksum;
1738 ra.td = curthread;
1739 ra.fp = fp;
1740 ra.voff = *voffp;
1741 ra.bufsize = 1<<20;
1742 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1743
1744 /* these were verified in dmu_recv_begin */
1745 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
1746 DMU_SUBSTREAM);
1747 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
1748
1749 /*
1750 * Open the objset we are modifying.
1751 */
1752 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
1753
1754 ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1755
1756 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1757
1758 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1759 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1760 minor_t minor;
1761
1762 if (cleanup_fd == -1) {
1763 ra.err = SET_ERROR(EBADF);
1764 goto out;
1765 }
1766 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1767 if (ra.err != 0) {
1768 cleanup_fd = -1;
1769 goto out;
1770 }
1771
1772 if (*action_handlep == 0) {
1773 ra.guid_to_ds_map =
1774 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1775 avl_create(ra.guid_to_ds_map, guid_compare,
1776 sizeof (guid_map_entry_t),
1777 offsetof(guid_map_entry_t, avlnode));
1778 ra.err = zfs_onexit_add_cb(minor,
1779 free_guid_map_onexit, ra.guid_to_ds_map,
1780 action_handlep);
1781 if (ra.err != 0)
1782 goto out;
1783 } else {
1784 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1785 (void **)&ra.guid_to_ds_map);
1786 if (ra.err != 0)
1787 goto out;
1788 }
1789
1790 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1791 }
1792
1793 /*
1794 * Read records and process them.
1795 */
1796 pcksum = ra.cksum;
1797 while (ra.err == 0 &&
1798 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1799 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1800 ra.err = SET_ERROR(EINTR);
1801 goto out;
1802 }
1803
1804 if (ra.byteswap)
1805 backup_byteswap(drr);
1806
1807 switch (drr->drr_type) {
1808 case DRR_OBJECT:
1809 {
1810 /*
1811 * We need to make a copy of the record header,
1812 * because restore_{object,write} may need to
1813 * restore_read(), which will invalidate drr.
1814 */
1815 struct drr_object drro = drr->drr_u.drr_object;
1816 ra.err = restore_object(&ra, os, &drro);
1817 break;
1818 }
1819 case DRR_FREEOBJECTS:
1820 {
1821 struct drr_freeobjects drrfo =
1822 drr->drr_u.drr_freeobjects;
1823 ra.err = restore_freeobjects(&ra, os, &drrfo);
1824 break;
1825 }
1826 case DRR_WRITE:
1827 {
1828 struct drr_write drrw = drr->drr_u.drr_write;
1829 ra.err = restore_write(&ra, os, &drrw);
1830 break;
1831 }
1832 case DRR_WRITE_BYREF:
1833 {
1834 struct drr_write_byref drrwbr =
1835 drr->drr_u.drr_write_byref;
1836 ra.err = restore_write_byref(&ra, os, &drrwbr);
1837 break;
1838 }
1839 case DRR_WRITE_EMBEDDED:
1840 {
1841 struct drr_write_embedded drrwe =
1842 drr->drr_u.drr_write_embedded;
1843 ra.err = restore_write_embedded(&ra, os, &drrwe);
1844 break;
1845 }
1846 case DRR_FREE:
1847 {
1848 struct drr_free drrf = drr->drr_u.drr_free;
1849 ra.err = restore_free(&ra, os, &drrf);
1850 break;
1851 }
1852 case DRR_END:
1853 {
1854 struct drr_end drre = drr->drr_u.drr_end;
1855 /*
1856 * We compare against the *previous* checksum
1857 * value, because the stored checksum is of
1858 * everything before the DRR_END record.
1859 */
1860 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1861 ra.err = SET_ERROR(ECKSUM);
1862 goto out;
1863 }
1864 case DRR_SPILL:
1865 {
1866 struct drr_spill drrs = drr->drr_u.drr_spill;
1867 ra.err = restore_spill(&ra, os, &drrs);
1868 break;
1869 }
1870 default:
1871 ra.err = SET_ERROR(EINVAL);
1872 goto out;
1873 }
1874 pcksum = ra.cksum;
1875 }
1876 ASSERT(ra.err != 0);
1877
1878out:
1879 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1880 zfs_onexit_fd_rele(cleanup_fd);
1881
1882 if (ra.err != 0) {
1883 /*
1884 * destroy what we created, so we don't leave it in the
1885 * inconsistent restoring state.
1886 */
1887 dmu_recv_cleanup_ds(drc);
1888 }
1889
1890 kmem_free(ra.buf, ra.bufsize);
1891 *voffp = ra.voff;
1892 return (ra.err);
1893}
1894
1895static int
1896dmu_recv_end_check(void *arg, dmu_tx_t *tx)
1897{
1898 dmu_recv_cookie_t *drc = arg;
1899 dsl_pool_t *dp = dmu_tx_pool(tx);
1900 int error;
1901
1902 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
1903
1904 if (!drc->drc_newfs) {
1905 dsl_dataset_t *origin_head;
1906
1907 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
1908 if (error != 0)
1909 return (error);
1910 if (drc->drc_force) {
1911 /*
1912 * We will destroy any snapshots in tofs (i.e. before
1913 * origin_head) that are after the origin (which is
1914 * the snap before drc_ds, because drc_ds can not
1915 * have any snaps of its own).
1916 */
1917 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1918 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1919 dsl_dataset_t *snap;
1920 error = dsl_dataset_hold_obj(dp, obj, FTAG,
1921 &snap);
1922 if (error != 0)
1923 return (error);
1924 if (snap->ds_dir != origin_head->ds_dir)
1925 error = SET_ERROR(EINVAL);
1926 if (error == 0) {
1927 error = dsl_destroy_snapshot_check_impl(
1928 snap, B_FALSE);
1929 }
1930 obj = snap->ds_phys->ds_prev_snap_obj;
1931 dsl_dataset_rele(snap, FTAG);
1932 if (error != 0)
1933 return (error);
1934 }
1935 }
1936 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
1937 origin_head, drc->drc_force, drc->drc_owner, tx);
1938 if (error != 0) {
1939 dsl_dataset_rele(origin_head, FTAG);
1940 return (error);
1941 }
1942 error = dsl_dataset_snapshot_check_impl(origin_head,
1943 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1944 dsl_dataset_rele(origin_head, FTAG);
1945 if (error != 0)
1946 return (error);
1947
1948 error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
1949 } else {
1950 error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
1951 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1952 }
1953 return (error);
1954}
1955
1956static void
1957dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
1958{
1959 dmu_recv_cookie_t *drc = arg;
1960 dsl_pool_t *dp = dmu_tx_pool(tx);
1961
1962 spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
1963 tx, "snap=%s", drc->drc_tosnap);
1964
1965 if (!drc->drc_newfs) {
1966 dsl_dataset_t *origin_head;
1967
1968 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
1969 &origin_head));
1970
1971 if (drc->drc_force) {
1972 /*
1973 * Destroy any snapshots of drc_tofs (origin_head)
1974 * after the origin (the snap before drc_ds).
1975 */
1976 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1977 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1978 dsl_dataset_t *snap;
1979 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
1980 &snap));
1981 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
1982 obj = snap->ds_phys->ds_prev_snap_obj;
1983 dsl_destroy_snapshot_sync_impl(snap,
1984 B_FALSE, tx);
1985 dsl_dataset_rele(snap, FTAG);
1986 }
1987 }
1988 VERIFY3P(drc->drc_ds->ds_prev, ==,
1989 origin_head->ds_prev);
1990
1991 dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
1992 origin_head, tx);
1993 dsl_dataset_snapshot_sync_impl(origin_head,
1994 drc->drc_tosnap, tx);
1995
1996 /* set snapshot's creation time and guid */
1997 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
1998 origin_head->ds_prev->ds_phys->ds_creation_time =
1999 drc->drc_drrb->drr_creation_time;
2000 origin_head->ds_prev->ds_phys->ds_guid =
2001 drc->drc_drrb->drr_toguid;
2002 origin_head->ds_prev->ds_phys->ds_flags &=
2003 ~DS_FLAG_INCONSISTENT;
2004
2005 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2006 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
2007
2008 dsl_dataset_rele(origin_head, FTAG);
2009 dsl_destroy_head_sync_impl(drc->drc_ds, tx);
2010
2011 if (drc->drc_owner != NULL)
2012 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner);
2013 } else {
2014 dsl_dataset_t *ds = drc->drc_ds;
2015
2016 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
2017
2018 /* set snapshot's creation time and guid */
2019 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
2020 ds->ds_prev->ds_phys->ds_creation_time =
2021 drc->drc_drrb->drr_creation_time;
2022 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid;
2023 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
2024
2025 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2026 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
2027 }
2028 drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj;
2029 /*
2030 * Release the hold from dmu_recv_begin. This must be done before
2031 * we return to open context, so that when we free the dataset's dnode,
2032 * we can evict its bonus buffer.
2033 */
2034 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
2035 drc->drc_ds = NULL;
2036}
2037
2038static int
2039add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
2040{
2041 dsl_pool_t *dp;
2042 dsl_dataset_t *snapds;
2043 guid_map_entry_t *gmep;
2044 int err;
2045
2046 ASSERT(guid_map != NULL);
2047
2048 err = dsl_pool_hold(name, FTAG, &dp);
2049 if (err != 0)
2050 return (err);
2051 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP);
2052 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds);
2053 if (err == 0) {
2054 gmep->guid = snapds->ds_phys->ds_guid;
2055 gmep->gme_ds = snapds;
2056 avl_add(guid_map, gmep);
2057 dsl_dataset_long_hold(snapds, gmep);
2058 } else
2059 kmem_free(gmep, sizeof (*gmep));
2060
2061 dsl_pool_rele(dp, FTAG);
2062 return (err);
2063}
2064
2065static int dmu_recv_end_modified_blocks = 3;
2066
2067static int
2068dmu_recv_existing_end(dmu_recv_cookie_t *drc)
2069{
2070 int error;
2071 char name[MAXNAMELEN];
2072
2073#ifdef _KERNEL
2074 /*
2075 * We will be destroying the ds; make sure its origin is unmounted if
2076 * necessary.
2077 */
2078 dsl_dataset_name(drc->drc_ds, name);
2079 zfs_destroy_unmount_origin(name);
2080#endif
2081
2082 error = dsl_sync_task(drc->drc_tofs,
2083 dmu_recv_end_check, dmu_recv_end_sync, drc,
2084 dmu_recv_end_modified_blocks);
2085
2086 if (error != 0)
2087 dmu_recv_cleanup_ds(drc);
2088 return (error);
2089}
2090
2091static int
2092dmu_recv_new_end(dmu_recv_cookie_t *drc)
2093{
2094 int error;
2095
2096 error = dsl_sync_task(drc->drc_tofs,
2097 dmu_recv_end_check, dmu_recv_end_sync, drc,
2098 dmu_recv_end_modified_blocks);
2099
2100 if (error != 0) {
2101 dmu_recv_cleanup_ds(drc);
2102 } else if (drc->drc_guid_to_ds_map != NULL) {
2103 (void) add_ds_to_guidmap(drc->drc_tofs,
2104 drc->drc_guid_to_ds_map,
2105 drc->drc_newsnapobj);
2106 }
2107 return (error);
2108}
2109
2110int
2111dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
2112{
2113 drc->drc_owner = owner;
2114
2115 if (drc->drc_newfs)
2116 return (dmu_recv_new_end(drc));
2117 else
2118 return (dmu_recv_existing_end(drc));
2119}
2120
2121/*
2122 * Return TRUE if this objset is currently being received into.
2123 */
2124boolean_t
2125dmu_objset_is_receiving(objset_t *os)
2126{
2127 return (os->os_dsl_dataset != NULL &&
2128 os->os_dsl_dataset->ds_owner == dmu_recv_tag);
2129}
| 445{
446 dmu_sendarg_t *dsp = arg;
447 dmu_object_type_t type = bp ? BP_GET_TYPE(bp) : DMU_OT_NONE;
448 int err = 0;
449
450 if (issig(JUSTLOOKING) && issig(FORREAL))
451 return (SET_ERROR(EINTR));
452
453 if (zb->zb_object != DMU_META_DNODE_OBJECT &&
454 DMU_OBJECT_IS_SPECIAL(zb->zb_object)) {
455 return (0);
456 } else if (zb->zb_level == ZB_ZIL_LEVEL) {
457 /*
458 * If we are sending a non-snapshot (which is allowed on
459 * read-only pools), it may have a ZIL, which must be ignored.
460 */
461 return (0);
462 } else if (BP_IS_HOLE(bp) &&
463 zb->zb_object == DMU_META_DNODE_OBJECT) {
464 uint64_t span = BP_SPAN(dnp, zb->zb_level);
465 uint64_t dnobj = (zb->zb_blkid * span) >> DNODE_SHIFT;
466 err = dump_freeobjects(dsp, dnobj, span >> DNODE_SHIFT);
467 } else if (BP_IS_HOLE(bp)) {
468 uint64_t span = BP_SPAN(dnp, zb->zb_level);
469 err = dump_free(dsp, zb->zb_object, zb->zb_blkid * span, span);
470 } else if (zb->zb_level > 0 || type == DMU_OT_OBJSET) {
471 return (0);
472 } else if (type == DMU_OT_DNODE) {
473 dnode_phys_t *blk;
474 int i;
475 int blksz = BP_GET_LSIZE(bp);
476 uint32_t aflags = ARC_WAIT;
477 arc_buf_t *abuf;
478
479 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
480 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
481 &aflags, zb) != 0)
482 return (SET_ERROR(EIO));
483
484 blk = abuf->b_data;
485 for (i = 0; i < blksz >> DNODE_SHIFT; i++) {
486 uint64_t dnobj = (zb->zb_blkid <<
487 (DNODE_BLOCK_SHIFT - DNODE_SHIFT)) + i;
488 err = dump_dnode(dsp, dnobj, blk+i);
489 if (err != 0)
490 break;
491 }
492 (void) arc_buf_remove_ref(abuf, &abuf);
493 } else if (type == DMU_OT_SA) {
494 uint32_t aflags = ARC_WAIT;
495 arc_buf_t *abuf;
496 int blksz = BP_GET_LSIZE(bp);
497
498 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
499 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
500 &aflags, zb) != 0)
501 return (SET_ERROR(EIO));
502
503 err = dump_spill(dsp, zb->zb_object, blksz, abuf->b_data);
504 (void) arc_buf_remove_ref(abuf, &abuf);
505 } else if (backup_do_embed(dsp, bp)) {
506 /* it's an embedded level-0 block of a regular object */
507 int blksz = dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT;
508 err = dump_write_embedded(dsp, zb->zb_object,
509 zb->zb_blkid * blksz, blksz, bp);
510 } else { /* it's a level-0 block of a regular object */
511 uint32_t aflags = ARC_WAIT;
512 arc_buf_t *abuf;
513 int blksz = BP_GET_LSIZE(bp);
514
515 ASSERT3U(blksz, ==, dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
516 ASSERT0(zb->zb_level);
517 if (arc_read(NULL, spa, bp, arc_getbuf_func, &abuf,
518 ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL,
519 &aflags, zb) != 0) {
520 if (zfs_send_corrupt_data) {
521 /* Send a block filled with 0x"zfs badd bloc" */
522 abuf = arc_buf_alloc(spa, blksz, &abuf,
523 ARC_BUFC_DATA);
524 uint64_t *ptr;
525 for (ptr = abuf->b_data;
526 (char *)ptr < (char *)abuf->b_data + blksz;
527 ptr++)
528 *ptr = 0x2f5baddb10c;
529 } else {
530 return (SET_ERROR(EIO));
531 }
532 }
533
534 err = dump_write(dsp, type, zb->zb_object, zb->zb_blkid * blksz,
535 blksz, bp, abuf->b_data);
536 (void) arc_buf_remove_ref(abuf, &abuf);
537 }
538
539 ASSERT(err == 0 || err == EINTR);
540 return (err);
541}
542
543/*
544 * Releases dp using the specified tag.
545 */
546static int
547dmu_send_impl(void *tag, dsl_pool_t *dp, dsl_dataset_t *ds,
548 zfs_bookmark_phys_t *fromzb, boolean_t is_clone, boolean_t embedok,
549#ifdef illumos
550 int outfd, vnode_t *vp, offset_t *off)
551#else
552 int outfd, struct file *fp, offset_t *off)
553#endif
554{
555 objset_t *os;
556 dmu_replay_record_t *drr;
557 dmu_sendarg_t *dsp;
558 int err;
559 uint64_t fromtxg = 0;
560 uint64_t featureflags = 0;
561
562 err = dmu_objset_from_ds(ds, &os);
563 if (err != 0) {
564 dsl_pool_rele(dp, tag);
565 return (err);
566 }
567
568 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
569 drr->drr_type = DRR_BEGIN;
570 drr->drr_u.drr_begin.drr_magic = DMU_BACKUP_MAGIC;
571 DMU_SET_STREAM_HDRTYPE(drr->drr_u.drr_begin.drr_versioninfo,
572 DMU_SUBSTREAM);
573
574#ifdef _KERNEL
575 if (dmu_objset_type(os) == DMU_OST_ZFS) {
576 uint64_t version;
577 if (zfs_get_zplprop(os, ZFS_PROP_VERSION, &version) != 0) {
578 kmem_free(drr, sizeof (dmu_replay_record_t));
579 dsl_pool_rele(dp, tag);
580 return (SET_ERROR(EINVAL));
581 }
582 if (version >= ZPL_VERSION_SA) {
583 featureflags |= DMU_BACKUP_FEATURE_SA_SPILL;
584 }
585 }
586#endif
587
588 if (embedok &&
589 spa_feature_is_active(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA)) {
590 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA;
591 if (spa_feature_is_active(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
592 featureflags |= DMU_BACKUP_FEATURE_EMBED_DATA_LZ4;
593 } else {
594 embedok = B_FALSE;
595 }
596
597 DMU_SET_FEATUREFLAGS(drr->drr_u.drr_begin.drr_versioninfo,
598 featureflags);
599
600 drr->drr_u.drr_begin.drr_creation_time =
601 ds->ds_phys->ds_creation_time;
602 drr->drr_u.drr_begin.drr_type = dmu_objset_type(os);
603 if (is_clone)
604 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CLONE;
605 drr->drr_u.drr_begin.drr_toguid = ds->ds_phys->ds_guid;
606 if (ds->ds_phys->ds_flags & DS_FLAG_CI_DATASET)
607 drr->drr_u.drr_begin.drr_flags |= DRR_FLAG_CI_DATA;
608
609 if (fromzb != NULL) {
610 drr->drr_u.drr_begin.drr_fromguid = fromzb->zbm_guid;
611 fromtxg = fromzb->zbm_creation_txg;
612 }
613 dsl_dataset_name(ds, drr->drr_u.drr_begin.drr_toname);
614 if (!dsl_dataset_is_snapshot(ds)) {
615 (void) strlcat(drr->drr_u.drr_begin.drr_toname, "@--head--",
616 sizeof (drr->drr_u.drr_begin.drr_toname));
617 }
618
619 dsp = kmem_zalloc(sizeof (dmu_sendarg_t), KM_SLEEP);
620
621 dsp->dsa_drr = drr;
622 dsp->dsa_outfd = outfd;
623 dsp->dsa_proc = curproc;
624 dsp->dsa_td = curthread;
625 dsp->dsa_fp = fp;
626 dsp->dsa_os = os;
627 dsp->dsa_off = off;
628 dsp->dsa_toguid = ds->ds_phys->ds_guid;
629 ZIO_SET_CHECKSUM(&dsp->dsa_zc, 0, 0, 0, 0);
630 dsp->dsa_pending_op = PENDING_NONE;
631 dsp->dsa_incremental = (fromzb != NULL);
632 dsp->dsa_featureflags = featureflags;
633
634 mutex_enter(&ds->ds_sendstream_lock);
635 list_insert_head(&ds->ds_sendstreams, dsp);
636 mutex_exit(&ds->ds_sendstream_lock);
637
638 dsl_dataset_long_hold(ds, FTAG);
639 dsl_pool_rele(dp, tag);
640
641 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
642 err = dsp->dsa_err;
643 goto out;
644 }
645
646 err = traverse_dataset(ds, fromtxg, TRAVERSE_PRE | TRAVERSE_PREFETCH,
647 backup_cb, dsp);
648
649 if (dsp->dsa_pending_op != PENDING_NONE)
650 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0)
651 err = SET_ERROR(EINTR);
652
653 if (err != 0) {
654 if (err == EINTR && dsp->dsa_err != 0)
655 err = dsp->dsa_err;
656 goto out;
657 }
658
659 bzero(drr, sizeof (dmu_replay_record_t));
660 drr->drr_type = DRR_END;
661 drr->drr_u.drr_end.drr_checksum = dsp->dsa_zc;
662 drr->drr_u.drr_end.drr_toguid = dsp->dsa_toguid;
663
664 if (dump_bytes(dsp, drr, sizeof (dmu_replay_record_t)) != 0) {
665 err = dsp->dsa_err;
666 goto out;
667 }
668
669out:
670 mutex_enter(&ds->ds_sendstream_lock);
671 list_remove(&ds->ds_sendstreams, dsp);
672 mutex_exit(&ds->ds_sendstream_lock);
673
674 kmem_free(drr, sizeof (dmu_replay_record_t));
675 kmem_free(dsp, sizeof (dmu_sendarg_t));
676
677 dsl_dataset_long_rele(ds, FTAG);
678
679 return (err);
680}
681
682int
683dmu_send_obj(const char *pool, uint64_t tosnap, uint64_t fromsnap,
684#ifdef illumos
685 boolean_t embedok, int outfd, vnode_t *vp, offset_t *off)
686#else
687 boolean_t embedok, int outfd, struct file *fp, offset_t *off)
688#endif
689{
690 dsl_pool_t *dp;
691 dsl_dataset_t *ds;
692 dsl_dataset_t *fromds = NULL;
693 int err;
694
695 err = dsl_pool_hold(pool, FTAG, &dp);
696 if (err != 0)
697 return (err);
698
699 err = dsl_dataset_hold_obj(dp, tosnap, FTAG, &ds);
700 if (err != 0) {
701 dsl_pool_rele(dp, FTAG);
702 return (err);
703 }
704
705 if (fromsnap != 0) {
706 zfs_bookmark_phys_t zb;
707 boolean_t is_clone;
708
709 err = dsl_dataset_hold_obj(dp, fromsnap, FTAG, &fromds);
710 if (err != 0) {
711 dsl_dataset_rele(ds, FTAG);
712 dsl_pool_rele(dp, FTAG);
713 return (err);
714 }
715 if (!dsl_dataset_is_before(ds, fromds, 0))
716 err = SET_ERROR(EXDEV);
717 zb.zbm_creation_time = fromds->ds_phys->ds_creation_time;
718 zb.zbm_creation_txg = fromds->ds_phys->ds_creation_txg;
719 zb.zbm_guid = fromds->ds_phys->ds_guid;
720 is_clone = (fromds->ds_dir != ds->ds_dir);
721 dsl_dataset_rele(fromds, FTAG);
722 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
723 outfd, fp, off);
724 } else {
725 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
726 outfd, fp, off);
727 }
728 dsl_dataset_rele(ds, FTAG);
729 return (err);
730}
731
732int
733dmu_send(const char *tosnap, const char *fromsnap, boolean_t embedok,
734#ifdef illumos
735 int outfd, vnode_t *vp, offset_t *off)
736#else
737 int outfd, struct file *fp, offset_t *off)
738#endif
739{
740 dsl_pool_t *dp;
741 dsl_dataset_t *ds;
742 int err;
743 boolean_t owned = B_FALSE;
744
745 if (fromsnap != NULL && strpbrk(fromsnap, "@#") == NULL)
746 return (SET_ERROR(EINVAL));
747
748 err = dsl_pool_hold(tosnap, FTAG, &dp);
749 if (err != 0)
750 return (err);
751
752 if (strchr(tosnap, '@') == NULL && spa_writeable(dp->dp_spa)) {
753 /*
754 * We are sending a filesystem or volume. Ensure
755 * that it doesn't change by owning the dataset.
756 */
757 err = dsl_dataset_own(dp, tosnap, FTAG, &ds);
758 owned = B_TRUE;
759 } else {
760 err = dsl_dataset_hold(dp, tosnap, FTAG, &ds);
761 }
762 if (err != 0) {
763 dsl_pool_rele(dp, FTAG);
764 return (err);
765 }
766
767 if (fromsnap != NULL) {
768 zfs_bookmark_phys_t zb;
769 boolean_t is_clone = B_FALSE;
770 int fsnamelen = strchr(tosnap, '@') - tosnap;
771
772 /*
773 * If the fromsnap is in a different filesystem, then
774 * mark the send stream as a clone.
775 */
776 if (strncmp(tosnap, fromsnap, fsnamelen) != 0 ||
777 (fromsnap[fsnamelen] != '@' &&
778 fromsnap[fsnamelen] != '#')) {
779 is_clone = B_TRUE;
780 }
781
782 if (strchr(fromsnap, '@')) {
783 dsl_dataset_t *fromds;
784 err = dsl_dataset_hold(dp, fromsnap, FTAG, &fromds);
785 if (err == 0) {
786 if (!dsl_dataset_is_before(ds, fromds, 0))
787 err = SET_ERROR(EXDEV);
788 zb.zbm_creation_time =
789 fromds->ds_phys->ds_creation_time;
790 zb.zbm_creation_txg =
791 fromds->ds_phys->ds_creation_txg;
792 zb.zbm_guid = fromds->ds_phys->ds_guid;
793 is_clone = (ds->ds_dir != fromds->ds_dir);
794 dsl_dataset_rele(fromds, FTAG);
795 }
796 } else {
797 err = dsl_bookmark_lookup(dp, fromsnap, ds, &zb);
798 }
799 if (err != 0) {
800 dsl_dataset_rele(ds, FTAG);
801 dsl_pool_rele(dp, FTAG);
802 return (err);
803 }
804 err = dmu_send_impl(FTAG, dp, ds, &zb, is_clone, embedok,
805 outfd, fp, off);
806 } else {
807 err = dmu_send_impl(FTAG, dp, ds, NULL, B_FALSE, embedok,
808 outfd, fp, off);
809 }
810 if (owned)
811 dsl_dataset_disown(ds, FTAG);
812 else
813 dsl_dataset_rele(ds, FTAG);
814 return (err);
815}
816
817int
818dmu_send_estimate(dsl_dataset_t *ds, dsl_dataset_t *fromds, uint64_t *sizep)
819{
820 dsl_pool_t *dp = ds->ds_dir->dd_pool;
821 int err;
822 uint64_t size;
823
824 ASSERT(dsl_pool_config_held(dp));
825
826 /* tosnap must be a snapshot */
827 if (!dsl_dataset_is_snapshot(ds))
828 return (SET_ERROR(EINVAL));
829
830 /*
831 * fromsnap must be an earlier snapshot from the same fs as tosnap,
832 * or the origin's fs.
833 */
834 if (fromds != NULL && !dsl_dataset_is_before(ds, fromds, 0))
835 return (SET_ERROR(EXDEV));
836
837 /* Get uncompressed size estimate of changed data. */
838 if (fromds == NULL) {
839 size = ds->ds_phys->ds_uncompressed_bytes;
840 } else {
841 uint64_t used, comp;
842 err = dsl_dataset_space_written(fromds, ds,
843 &used, &comp, &size);
844 if (err != 0)
845 return (err);
846 }
847
848 /*
849 * Assume that space (both on-disk and in-stream) is dominated by
850 * data. We will adjust for indirect blocks and the copies property,
851 * but ignore per-object space used (eg, dnodes and DRR_OBJECT records).
852 */
853
854 /*
855 * Subtract out approximate space used by indirect blocks.
856 * Assume most space is used by data blocks (non-indirect, non-dnode).
857 * Assume all blocks are recordsize. Assume ditto blocks and
858 * internal fragmentation counter out compression.
859 *
860 * Therefore, space used by indirect blocks is sizeof(blkptr_t) per
861 * block, which we observe in practice.
862 */
863 uint64_t recordsize;
864 err = dsl_prop_get_int_ds(ds, "recordsize", &recordsize);
865 if (err != 0)
866 return (err);
867 size -= size / recordsize * sizeof (blkptr_t);
868
869 /* Add in the space for the record associated with each block. */
870 size += size / recordsize * sizeof (dmu_replay_record_t);
871
872 *sizep = size;
873
874 return (0);
875}
876
877typedef struct dmu_recv_begin_arg {
878 const char *drba_origin;
879 dmu_recv_cookie_t *drba_cookie;
880 cred_t *drba_cred;
881 uint64_t drba_snapobj;
882} dmu_recv_begin_arg_t;
883
884static int
885recv_begin_check_existing_impl(dmu_recv_begin_arg_t *drba, dsl_dataset_t *ds,
886 uint64_t fromguid)
887{
888 uint64_t val;
889 int error;
890 dsl_pool_t *dp = ds->ds_dir->dd_pool;
891
892 /* temporary clone name must not exist */
893 error = zap_lookup(dp->dp_meta_objset,
894 ds->ds_dir->dd_phys->dd_child_dir_zapobj, recv_clone_name,
895 8, 1, &val);
896 if (error != ENOENT)
897 return (error == 0 ? EBUSY : error);
898
899 /* new snapshot name must not exist */
900 error = zap_lookup(dp->dp_meta_objset,
901 ds->ds_phys->ds_snapnames_zapobj, drba->drba_cookie->drc_tosnap,
902 8, 1, &val);
903 if (error != ENOENT)
904 return (error == 0 ? EEXIST : error);
905
906 /*
907 * Check snapshot limit before receiving. We'll recheck again at the
908 * end, but might as well abort before receiving if we're already over
909 * the limit.
910 *
911 * Note that we do not check the file system limit with
912 * dsl_dir_fscount_check because the temporary %clones don't count
913 * against that limit.
914 */
915 error = dsl_fs_ss_limit_check(ds->ds_dir, 1, ZFS_PROP_SNAPSHOT_LIMIT,
916 NULL, drba->drba_cred);
917 if (error != 0)
918 return (error);
919
920 if (fromguid != 0) {
921 dsl_dataset_t *snap;
922 uint64_t obj = ds->ds_phys->ds_prev_snap_obj;
923
924 /* Find snapshot in this dir that matches fromguid. */
925 while (obj != 0) {
926 error = dsl_dataset_hold_obj(dp, obj, FTAG,
927 &snap);
928 if (error != 0)
929 return (SET_ERROR(ENODEV));
930 if (snap->ds_dir != ds->ds_dir) {
931 dsl_dataset_rele(snap, FTAG);
932 return (SET_ERROR(ENODEV));
933 }
934 if (snap->ds_phys->ds_guid == fromguid)
935 break;
936 obj = snap->ds_phys->ds_prev_snap_obj;
937 dsl_dataset_rele(snap, FTAG);
938 }
939 if (obj == 0)
940 return (SET_ERROR(ENODEV));
941
942 if (drba->drba_cookie->drc_force) {
943 drba->drba_snapobj = obj;
944 } else {
945 /*
946 * If we are not forcing, there must be no
947 * changes since fromsnap.
948 */
949 if (dsl_dataset_modified_since_snap(ds, snap)) {
950 dsl_dataset_rele(snap, FTAG);
951 return (SET_ERROR(ETXTBSY));
952 }
953 drba->drba_snapobj = ds->ds_prev->ds_object;
954 }
955
956 dsl_dataset_rele(snap, FTAG);
957 } else {
958 /* if full, most recent snapshot must be $ORIGIN */
959 if (ds->ds_phys->ds_prev_snap_txg >= TXG_INITIAL)
960 return (SET_ERROR(ENODEV));
961 drba->drba_snapobj = ds->ds_phys->ds_prev_snap_obj;
962 }
963
964 return (0);
965
966}
967
968static int
969dmu_recv_begin_check(void *arg, dmu_tx_t *tx)
970{
971 dmu_recv_begin_arg_t *drba = arg;
972 dsl_pool_t *dp = dmu_tx_pool(tx);
973 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
974 uint64_t fromguid = drrb->drr_fromguid;
975 int flags = drrb->drr_flags;
976 int error;
977 uint64_t featureflags = DMU_GET_FEATUREFLAGS(drrb->drr_versioninfo);
978 dsl_dataset_t *ds;
979 const char *tofs = drba->drba_cookie->drc_tofs;
980
981 /* already checked */
982 ASSERT3U(drrb->drr_magic, ==, DMU_BACKUP_MAGIC);
983
984 if (DMU_GET_STREAM_HDRTYPE(drrb->drr_versioninfo) ==
985 DMU_COMPOUNDSTREAM ||
986 drrb->drr_type >= DMU_OST_NUMTYPES ||
987 ((flags & DRR_FLAG_CLONE) && drba->drba_origin == NULL))
988 return (SET_ERROR(EINVAL));
989
990 /* Verify pool version supports SA if SA_SPILL feature set */
991 if ((featureflags & DMU_BACKUP_FEATURE_SA_SPILL) &&
992 spa_version(dp->dp_spa) < SPA_VERSION_SA)
993 return (SET_ERROR(ENOTSUP));
994
995 /*
996 * The receiving code doesn't know how to translate a WRITE_EMBEDDED
997 * record to a plan WRITE record, so the pool must have the
998 * EMBEDDED_DATA feature enabled if the stream has WRITE_EMBEDDED
999 * records. Same with WRITE_EMBEDDED records that use LZ4 compression.
1000 */
1001 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA) &&
1002 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_EMBEDDED_DATA))
1003 return (SET_ERROR(ENOTSUP));
1004 if ((featureflags & DMU_BACKUP_FEATURE_EMBED_DATA_LZ4) &&
1005 !spa_feature_is_enabled(dp->dp_spa, SPA_FEATURE_LZ4_COMPRESS))
1006 return (SET_ERROR(ENOTSUP));
1007
1008 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
1009 if (error == 0) {
1010 /* target fs already exists; recv into temp clone */
1011
1012 /* Can't recv a clone into an existing fs */
1013 if (flags & DRR_FLAG_CLONE) {
1014 dsl_dataset_rele(ds, FTAG);
1015 return (SET_ERROR(EINVAL));
1016 }
1017
1018 error = recv_begin_check_existing_impl(drba, ds, fromguid);
1019 dsl_dataset_rele(ds, FTAG);
1020 } else if (error == ENOENT) {
1021 /* target fs does not exist; must be a full backup or clone */
1022 char buf[MAXNAMELEN];
1023
1024 /*
1025 * If it's a non-clone incremental, we are missing the
1026 * target fs, so fail the recv.
1027 */
1028 if (fromguid != 0 && !(flags & DRR_FLAG_CLONE))
1029 return (SET_ERROR(ENOENT));
1030
1031 /* Open the parent of tofs */
1032 ASSERT3U(strlen(tofs), <, MAXNAMELEN);
1033 (void) strlcpy(buf, tofs, strrchr(tofs, '/') - tofs + 1);
1034 error = dsl_dataset_hold(dp, buf, FTAG, &ds);
1035 if (error != 0)
1036 return (error);
1037
1038 /*
1039 * Check filesystem and snapshot limits before receiving. We'll
1040 * recheck snapshot limits again at the end (we create the
1041 * filesystems and increment those counts during begin_sync).
1042 */
1043 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
1044 ZFS_PROP_FILESYSTEM_LIMIT, NULL, drba->drba_cred);
1045 if (error != 0) {
1046 dsl_dataset_rele(ds, FTAG);
1047 return (error);
1048 }
1049
1050 error = dsl_fs_ss_limit_check(ds->ds_dir, 1,
1051 ZFS_PROP_SNAPSHOT_LIMIT, NULL, drba->drba_cred);
1052 if (error != 0) {
1053 dsl_dataset_rele(ds, FTAG);
1054 return (error);
1055 }
1056
1057 if (drba->drba_origin != NULL) {
1058 dsl_dataset_t *origin;
1059 error = dsl_dataset_hold(dp, drba->drba_origin,
1060 FTAG, &origin);
1061 if (error != 0) {
1062 dsl_dataset_rele(ds, FTAG);
1063 return (error);
1064 }
1065 if (!dsl_dataset_is_snapshot(origin)) {
1066 dsl_dataset_rele(origin, FTAG);
1067 dsl_dataset_rele(ds, FTAG);
1068 return (SET_ERROR(EINVAL));
1069 }
1070 if (origin->ds_phys->ds_guid != fromguid) {
1071 dsl_dataset_rele(origin, FTAG);
1072 dsl_dataset_rele(ds, FTAG);
1073 return (SET_ERROR(ENODEV));
1074 }
1075 dsl_dataset_rele(origin, FTAG);
1076 }
1077 dsl_dataset_rele(ds, FTAG);
1078 error = 0;
1079 }
1080 return (error);
1081}
1082
1083static void
1084dmu_recv_begin_sync(void *arg, dmu_tx_t *tx)
1085{
1086 dmu_recv_begin_arg_t *drba = arg;
1087 dsl_pool_t *dp = dmu_tx_pool(tx);
1088 struct drr_begin *drrb = drba->drba_cookie->drc_drrb;
1089 const char *tofs = drba->drba_cookie->drc_tofs;
1090 dsl_dataset_t *ds, *newds;
1091 uint64_t dsobj;
1092 int error;
1093 uint64_t crflags;
1094
1095 crflags = (drrb->drr_flags & DRR_FLAG_CI_DATA) ?
1096 DS_FLAG_CI_DATASET : 0;
1097
1098 error = dsl_dataset_hold(dp, tofs, FTAG, &ds);
1099 if (error == 0) {
1100 /* create temporary clone */
1101 dsl_dataset_t *snap = NULL;
1102 if (drba->drba_snapobj != 0) {
1103 VERIFY0(dsl_dataset_hold_obj(dp,
1104 drba->drba_snapobj, FTAG, &snap));
1105 }
1106 dsobj = dsl_dataset_create_sync(ds->ds_dir, recv_clone_name,
1107 snap, crflags, drba->drba_cred, tx);
1108 dsl_dataset_rele(snap, FTAG);
1109 dsl_dataset_rele(ds, FTAG);
1110 } else {
1111 dsl_dir_t *dd;
1112 const char *tail;
1113 dsl_dataset_t *origin = NULL;
1114
1115 VERIFY0(dsl_dir_hold(dp, tofs, FTAG, &dd, &tail));
1116
1117 if (drba->drba_origin != NULL) {
1118 VERIFY0(dsl_dataset_hold(dp, drba->drba_origin,
1119 FTAG, &origin));
1120 }
1121
1122 /* Create new dataset. */
1123 dsobj = dsl_dataset_create_sync(dd,
1124 strrchr(tofs, '/') + 1,
1125 origin, crflags, drba->drba_cred, tx);
1126 if (origin != NULL)
1127 dsl_dataset_rele(origin, FTAG);
1128 dsl_dir_rele(dd, FTAG);
1129 drba->drba_cookie->drc_newfs = B_TRUE;
1130 }
1131 VERIFY0(dsl_dataset_own_obj(dp, dsobj, dmu_recv_tag, &newds));
1132
1133 dmu_buf_will_dirty(newds->ds_dbuf, tx);
1134 newds->ds_phys->ds_flags |= DS_FLAG_INCONSISTENT;
1135
1136 /*
1137 * If we actually created a non-clone, we need to create the
1138 * objset in our new dataset.
1139 */
1140 if (BP_IS_HOLE(dsl_dataset_get_blkptr(newds))) {
1141 (void) dmu_objset_create_impl(dp->dp_spa,
1142 newds, dsl_dataset_get_blkptr(newds), drrb->drr_type, tx);
1143 }
1144
1145 drba->drba_cookie->drc_ds = newds;
1146
1147 spa_history_log_internal_ds(newds, "receive", tx, "");
1148}
1149
1150/*
1151 * NB: callers *MUST* call dmu_recv_stream() if dmu_recv_begin()
1152 * succeeds; otherwise we will leak the holds on the datasets.
1153 */
1154int
1155dmu_recv_begin(char *tofs, char *tosnap, struct drr_begin *drrb,
1156 boolean_t force, char *origin, dmu_recv_cookie_t *drc)
1157{
1158 dmu_recv_begin_arg_t drba = { 0 };
1159 dmu_replay_record_t *drr;
1160
1161 bzero(drc, sizeof (dmu_recv_cookie_t));
1162 drc->drc_drrb = drrb;
1163 drc->drc_tosnap = tosnap;
1164 drc->drc_tofs = tofs;
1165 drc->drc_force = force;
1166 drc->drc_cred = CRED();
1167
1168 if (drrb->drr_magic == BSWAP_64(DMU_BACKUP_MAGIC))
1169 drc->drc_byteswap = B_TRUE;
1170 else if (drrb->drr_magic != DMU_BACKUP_MAGIC)
1171 return (SET_ERROR(EINVAL));
1172
1173 drr = kmem_zalloc(sizeof (dmu_replay_record_t), KM_SLEEP);
1174 drr->drr_type = DRR_BEGIN;
1175 drr->drr_u.drr_begin = *drc->drc_drrb;
1176 if (drc->drc_byteswap) {
1177 fletcher_4_incremental_byteswap(drr,
1178 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1179 } else {
1180 fletcher_4_incremental_native(drr,
1181 sizeof (dmu_replay_record_t), &drc->drc_cksum);
1182 }
1183 kmem_free(drr, sizeof (dmu_replay_record_t));
1184
1185 if (drc->drc_byteswap) {
1186 drrb->drr_magic = BSWAP_64(drrb->drr_magic);
1187 drrb->drr_versioninfo = BSWAP_64(drrb->drr_versioninfo);
1188 drrb->drr_creation_time = BSWAP_64(drrb->drr_creation_time);
1189 drrb->drr_type = BSWAP_32(drrb->drr_type);
1190 drrb->drr_toguid = BSWAP_64(drrb->drr_toguid);
1191 drrb->drr_fromguid = BSWAP_64(drrb->drr_fromguid);
1192 }
1193
1194 drba.drba_origin = origin;
1195 drba.drba_cookie = drc;
1196 drba.drba_cred = CRED();
1197
1198 return (dsl_sync_task(tofs, dmu_recv_begin_check, dmu_recv_begin_sync,
1199 &drba, 5));
1200}
1201
1202struct restorearg {
1203 int err;
1204 boolean_t byteswap;
1205 kthread_t *td;
1206 struct file *fp;
1207 char *buf;
1208 uint64_t voff;
1209 int bufsize; /* amount of memory allocated for buf */
1210 zio_cksum_t cksum;
1211 avl_tree_t *guid_to_ds_map;
1212};
1213
1214typedef struct guid_map_entry {
1215 uint64_t guid;
1216 dsl_dataset_t *gme_ds;
1217 avl_node_t avlnode;
1218} guid_map_entry_t;
1219
1220static int
1221guid_compare(const void *arg1, const void *arg2)
1222{
1223 const guid_map_entry_t *gmep1 = arg1;
1224 const guid_map_entry_t *gmep2 = arg2;
1225
1226 if (gmep1->guid < gmep2->guid)
1227 return (-1);
1228 else if (gmep1->guid > gmep2->guid)
1229 return (1);
1230 return (0);
1231}
1232
1233static void
1234free_guid_map_onexit(void *arg)
1235{
1236 avl_tree_t *ca = arg;
1237 void *cookie = NULL;
1238 guid_map_entry_t *gmep;
1239
1240 while ((gmep = avl_destroy_nodes(ca, &cookie)) != NULL) {
1241 dsl_dataset_long_rele(gmep->gme_ds, gmep);
1242 dsl_dataset_rele(gmep->gme_ds, gmep);
1243 kmem_free(gmep, sizeof (guid_map_entry_t));
1244 }
1245 avl_destroy(ca);
1246 kmem_free(ca, sizeof (avl_tree_t));
1247}
1248
1249static int
1250restore_bytes(struct restorearg *ra, void *buf, int len, off_t off, ssize_t *resid)
1251{
1252 struct uio auio;
1253 struct iovec aiov;
1254 int error;
1255
1256 aiov.iov_base = buf;
1257 aiov.iov_len = len;
1258 auio.uio_iov = &aiov;
1259 auio.uio_iovcnt = 1;
1260 auio.uio_resid = len;
1261 auio.uio_segflg = UIO_SYSSPACE;
1262 auio.uio_rw = UIO_READ;
1263 auio.uio_offset = off;
1264 auio.uio_td = ra->td;
1265#ifdef _KERNEL
1266 error = fo_read(ra->fp, &auio, ra->td->td_ucred, FOF_OFFSET, ra->td);
1267#else
1268 fprintf(stderr, "%s: returning EOPNOTSUPP\n", __func__);
1269 error = EOPNOTSUPP;
1270#endif
1271 *resid = auio.uio_resid;
1272 return (error);
1273}
1274
1275static void *
1276restore_read(struct restorearg *ra, int len)
1277{
1278 void *rv;
1279 int done = 0;
1280
1281 /* some things will require 8-byte alignment, so everything must */
1282 ASSERT0(len % 8);
1283
1284 while (done < len) {
1285 ssize_t resid;
1286
1287 ra->err = restore_bytes(ra, (caddr_t)ra->buf + done,
1288 len - done, ra->voff, &resid);
1289
1290 if (resid == len - done)
1291 ra->err = SET_ERROR(EINVAL);
1292 ra->voff += len - done - resid;
1293 done = len - resid;
1294 if (ra->err != 0)
1295 return (NULL);
1296 }
1297
1298 ASSERT3U(done, ==, len);
1299 rv = ra->buf;
1300 if (ra->byteswap)
1301 fletcher_4_incremental_byteswap(rv, len, &ra->cksum);
1302 else
1303 fletcher_4_incremental_native(rv, len, &ra->cksum);
1304 return (rv);
1305}
1306
1307static void
1308backup_byteswap(dmu_replay_record_t *drr)
1309{
1310#define DO64(X) (drr->drr_u.X = BSWAP_64(drr->drr_u.X))
1311#define DO32(X) (drr->drr_u.X = BSWAP_32(drr->drr_u.X))
1312 drr->drr_type = BSWAP_32(drr->drr_type);
1313 drr->drr_payloadlen = BSWAP_32(drr->drr_payloadlen);
1314 switch (drr->drr_type) {
1315 case DRR_BEGIN:
1316 DO64(drr_begin.drr_magic);
1317 DO64(drr_begin.drr_versioninfo);
1318 DO64(drr_begin.drr_creation_time);
1319 DO32(drr_begin.drr_type);
1320 DO32(drr_begin.drr_flags);
1321 DO64(drr_begin.drr_toguid);
1322 DO64(drr_begin.drr_fromguid);
1323 break;
1324 case DRR_OBJECT:
1325 DO64(drr_object.drr_object);
1326 DO32(drr_object.drr_type);
1327 DO32(drr_object.drr_bonustype);
1328 DO32(drr_object.drr_blksz);
1329 DO32(drr_object.drr_bonuslen);
1330 DO64(drr_object.drr_toguid);
1331 break;
1332 case DRR_FREEOBJECTS:
1333 DO64(drr_freeobjects.drr_firstobj);
1334 DO64(drr_freeobjects.drr_numobjs);
1335 DO64(drr_freeobjects.drr_toguid);
1336 break;
1337 case DRR_WRITE:
1338 DO64(drr_write.drr_object);
1339 DO32(drr_write.drr_type);
1340 DO64(drr_write.drr_offset);
1341 DO64(drr_write.drr_length);
1342 DO64(drr_write.drr_toguid);
1343 DO64(drr_write.drr_key.ddk_cksum.zc_word[0]);
1344 DO64(drr_write.drr_key.ddk_cksum.zc_word[1]);
1345 DO64(drr_write.drr_key.ddk_cksum.zc_word[2]);
1346 DO64(drr_write.drr_key.ddk_cksum.zc_word[3]);
1347 DO64(drr_write.drr_key.ddk_prop);
1348 break;
1349 case DRR_WRITE_BYREF:
1350 DO64(drr_write_byref.drr_object);
1351 DO64(drr_write_byref.drr_offset);
1352 DO64(drr_write_byref.drr_length);
1353 DO64(drr_write_byref.drr_toguid);
1354 DO64(drr_write_byref.drr_refguid);
1355 DO64(drr_write_byref.drr_refobject);
1356 DO64(drr_write_byref.drr_refoffset);
1357 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[0]);
1358 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[1]);
1359 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[2]);
1360 DO64(drr_write_byref.drr_key.ddk_cksum.zc_word[3]);
1361 DO64(drr_write_byref.drr_key.ddk_prop);
1362 break;
1363 case DRR_WRITE_EMBEDDED:
1364 DO64(drr_write_embedded.drr_object);
1365 DO64(drr_write_embedded.drr_offset);
1366 DO64(drr_write_embedded.drr_length);
1367 DO64(drr_write_embedded.drr_toguid);
1368 DO32(drr_write_embedded.drr_lsize);
1369 DO32(drr_write_embedded.drr_psize);
1370 break;
1371 case DRR_FREE:
1372 DO64(drr_free.drr_object);
1373 DO64(drr_free.drr_offset);
1374 DO64(drr_free.drr_length);
1375 DO64(drr_free.drr_toguid);
1376 break;
1377 case DRR_SPILL:
1378 DO64(drr_spill.drr_object);
1379 DO64(drr_spill.drr_length);
1380 DO64(drr_spill.drr_toguid);
1381 break;
1382 case DRR_END:
1383 DO64(drr_end.drr_checksum.zc_word[0]);
1384 DO64(drr_end.drr_checksum.zc_word[1]);
1385 DO64(drr_end.drr_checksum.zc_word[2]);
1386 DO64(drr_end.drr_checksum.zc_word[3]);
1387 DO64(drr_end.drr_toguid);
1388 break;
1389 }
1390#undef DO64
1391#undef DO32
1392}
1393
1394static int
1395restore_object(struct restorearg *ra, objset_t *os, struct drr_object *drro)
1396{
1397 int err;
1398 dmu_tx_t *tx;
1399 void *data = NULL;
1400
1401 if (drro->drr_type == DMU_OT_NONE ||
1402 !DMU_OT_IS_VALID(drro->drr_type) ||
1403 !DMU_OT_IS_VALID(drro->drr_bonustype) ||
1404 drro->drr_checksumtype >= ZIO_CHECKSUM_FUNCTIONS ||
1405 drro->drr_compress >= ZIO_COMPRESS_FUNCTIONS ||
1406 P2PHASE(drro->drr_blksz, SPA_MINBLOCKSIZE) ||
1407 drro->drr_blksz < SPA_MINBLOCKSIZE ||
1408 drro->drr_blksz > SPA_MAXBLOCKSIZE ||
1409 drro->drr_bonuslen > DN_MAX_BONUSLEN) {
1410 return (SET_ERROR(EINVAL));
1411 }
1412
1413 err = dmu_object_info(os, drro->drr_object, NULL);
1414
1415 if (err != 0 && err != ENOENT)
1416 return (SET_ERROR(EINVAL));
1417
1418 if (drro->drr_bonuslen) {
1419 data = restore_read(ra, P2ROUNDUP(drro->drr_bonuslen, 8));
1420 if (ra->err != 0)
1421 return (ra->err);
1422 }
1423
1424 if (err == ENOENT) {
1425 /* currently free, want to be allocated */
1426 tx = dmu_tx_create(os);
1427 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
1428 err = dmu_tx_assign(tx, TXG_WAIT);
1429 if (err != 0) {
1430 dmu_tx_abort(tx);
1431 return (err);
1432 }
1433 err = dmu_object_claim(os, drro->drr_object,
1434 drro->drr_type, drro->drr_blksz,
1435 drro->drr_bonustype, drro->drr_bonuslen, tx);
1436 dmu_tx_commit(tx);
1437 } else {
1438 /* currently allocated, want to be allocated */
1439 err = dmu_object_reclaim(os, drro->drr_object,
1440 drro->drr_type, drro->drr_blksz,
1441 drro->drr_bonustype, drro->drr_bonuslen);
1442 }
1443 if (err != 0) {
1444 return (SET_ERROR(EINVAL));
1445 }
1446
1447 tx = dmu_tx_create(os);
1448 dmu_tx_hold_bonus(tx, drro->drr_object);
1449 err = dmu_tx_assign(tx, TXG_WAIT);
1450 if (err != 0) {
1451 dmu_tx_abort(tx);
1452 return (err);
1453 }
1454
1455 dmu_object_set_checksum(os, drro->drr_object, drro->drr_checksumtype,
1456 tx);
1457 dmu_object_set_compress(os, drro->drr_object, drro->drr_compress, tx);
1458
1459 if (data != NULL) {
1460 dmu_buf_t *db;
1461
1462 VERIFY(0 == dmu_bonus_hold(os, drro->drr_object, FTAG, &db));
1463 dmu_buf_will_dirty(db, tx);
1464
1465 ASSERT3U(db->db_size, >=, drro->drr_bonuslen);
1466 bcopy(data, db->db_data, drro->drr_bonuslen);
1467 if (ra->byteswap) {
1468 dmu_object_byteswap_t byteswap =
1469 DMU_OT_BYTESWAP(drro->drr_bonustype);
1470 dmu_ot_byteswap[byteswap].ob_func(db->db_data,
1471 drro->drr_bonuslen);
1472 }
1473 dmu_buf_rele(db, FTAG);
1474 }
1475 dmu_tx_commit(tx);
1476 return (0);
1477}
1478
1479/* ARGSUSED */
1480static int
1481restore_freeobjects(struct restorearg *ra, objset_t *os,
1482 struct drr_freeobjects *drrfo)
1483{
1484 uint64_t obj;
1485
1486 if (drrfo->drr_firstobj + drrfo->drr_numobjs < drrfo->drr_firstobj)
1487 return (SET_ERROR(EINVAL));
1488
1489 for (obj = drrfo->drr_firstobj;
1490 obj < drrfo->drr_firstobj + drrfo->drr_numobjs;
1491 (void) dmu_object_next(os, &obj, FALSE, 0)) {
1492 int err;
1493
1494 if (dmu_object_info(os, obj, NULL) != 0)
1495 continue;
1496
1497 err = dmu_free_long_object(os, obj);
1498 if (err != 0)
1499 return (err);
1500 }
1501 return (0);
1502}
1503
1504static int
1505restore_write(struct restorearg *ra, objset_t *os,
1506 struct drr_write *drrw)
1507{
1508 dmu_tx_t *tx;
1509 void *data;
1510 int err;
1511
1512 if (drrw->drr_offset + drrw->drr_length < drrw->drr_offset ||
1513 !DMU_OT_IS_VALID(drrw->drr_type))
1514 return (SET_ERROR(EINVAL));
1515
1516 data = restore_read(ra, drrw->drr_length);
1517 if (data == NULL)
1518 return (ra->err);
1519
1520 if (dmu_object_info(os, drrw->drr_object, NULL) != 0)
1521 return (SET_ERROR(EINVAL));
1522
1523 tx = dmu_tx_create(os);
1524
1525 dmu_tx_hold_write(tx, drrw->drr_object,
1526 drrw->drr_offset, drrw->drr_length);
1527 err = dmu_tx_assign(tx, TXG_WAIT);
1528 if (err != 0) {
1529 dmu_tx_abort(tx);
1530 return (err);
1531 }
1532 if (ra->byteswap) {
1533 dmu_object_byteswap_t byteswap =
1534 DMU_OT_BYTESWAP(drrw->drr_type);
1535 dmu_ot_byteswap[byteswap].ob_func(data, drrw->drr_length);
1536 }
1537 dmu_write(os, drrw->drr_object,
1538 drrw->drr_offset, drrw->drr_length, data, tx);
1539 dmu_tx_commit(tx);
1540 return (0);
1541}
1542
1543/*
1544 * Handle a DRR_WRITE_BYREF record. This record is used in dedup'ed
1545 * streams to refer to a copy of the data that is already on the
1546 * system because it came in earlier in the stream. This function
1547 * finds the earlier copy of the data, and uses that copy instead of
1548 * data from the stream to fulfill this write.
1549 */
1550static int
1551restore_write_byref(struct restorearg *ra, objset_t *os,
1552 struct drr_write_byref *drrwbr)
1553{
1554 dmu_tx_t *tx;
1555 int err;
1556 guid_map_entry_t gmesrch;
1557 guid_map_entry_t *gmep;
1558 avl_index_t where;
1559 objset_t *ref_os = NULL;
1560 dmu_buf_t *dbp;
1561
1562 if (drrwbr->drr_offset + drrwbr->drr_length < drrwbr->drr_offset)
1563 return (SET_ERROR(EINVAL));
1564
1565 /*
1566 * If the GUID of the referenced dataset is different from the
1567 * GUID of the target dataset, find the referenced dataset.
1568 */
1569 if (drrwbr->drr_toguid != drrwbr->drr_refguid) {
1570 gmesrch.guid = drrwbr->drr_refguid;
1571 if ((gmep = avl_find(ra->guid_to_ds_map, &gmesrch,
1572 &where)) == NULL) {
1573 return (SET_ERROR(EINVAL));
1574 }
1575 if (dmu_objset_from_ds(gmep->gme_ds, &ref_os))
1576 return (SET_ERROR(EINVAL));
1577 } else {
1578 ref_os = os;
1579 }
1580
1581 err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
1582 drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH);
1583 if (err != 0)
1584 return (err);
1585
1586 tx = dmu_tx_create(os);
1587
1588 dmu_tx_hold_write(tx, drrwbr->drr_object,
1589 drrwbr->drr_offset, drrwbr->drr_length);
1590 err = dmu_tx_assign(tx, TXG_WAIT);
1591 if (err != 0) {
1592 dmu_tx_abort(tx);
1593 return (err);
1594 }
1595 dmu_write(os, drrwbr->drr_object,
1596 drrwbr->drr_offset, drrwbr->drr_length, dbp->db_data, tx);
1597 dmu_buf_rele(dbp, FTAG);
1598 dmu_tx_commit(tx);
1599 return (0);
1600}
1601
1602static int
1603restore_write_embedded(struct restorearg *ra, objset_t *os,
1604 struct drr_write_embedded *drrwnp)
1605{
1606 dmu_tx_t *tx;
1607 int err;
1608 void *data;
1609
1610 if (drrwnp->drr_offset + drrwnp->drr_length < drrwnp->drr_offset)
1611 return (EINVAL);
1612
1613 if (drrwnp->drr_psize > BPE_PAYLOAD_SIZE)
1614 return (EINVAL);
1615
1616 if (drrwnp->drr_etype >= NUM_BP_EMBEDDED_TYPES)
1617 return (EINVAL);
1618 if (drrwnp->drr_compression >= ZIO_COMPRESS_FUNCTIONS)
1619 return (EINVAL);
1620
1621 data = restore_read(ra, P2ROUNDUP(drrwnp->drr_psize, 8));
1622 if (data == NULL)
1623 return (ra->err);
1624
1625 tx = dmu_tx_create(os);
1626
1627 dmu_tx_hold_write(tx, drrwnp->drr_object,
1628 drrwnp->drr_offset, drrwnp->drr_length);
1629 err = dmu_tx_assign(tx, TXG_WAIT);
1630 if (err != 0) {
1631 dmu_tx_abort(tx);
1632 return (err);
1633 }
1634
1635 dmu_write_embedded(os, drrwnp->drr_object,
1636 drrwnp->drr_offset, data, drrwnp->drr_etype,
1637 drrwnp->drr_compression, drrwnp->drr_lsize, drrwnp->drr_psize,
1638 ra->byteswap ^ ZFS_HOST_BYTEORDER, tx);
1639
1640 dmu_tx_commit(tx);
1641 return (0);
1642}
1643
1644static int
1645restore_spill(struct restorearg *ra, objset_t *os, struct drr_spill *drrs)
1646{
1647 dmu_tx_t *tx;
1648 void *data;
1649 dmu_buf_t *db, *db_spill;
1650 int err;
1651
1652 if (drrs->drr_length < SPA_MINBLOCKSIZE ||
1653 drrs->drr_length > SPA_MAXBLOCKSIZE)
1654 return (SET_ERROR(EINVAL));
1655
1656 data = restore_read(ra, drrs->drr_length);
1657 if (data == NULL)
1658 return (ra->err);
1659
1660 if (dmu_object_info(os, drrs->drr_object, NULL) != 0)
1661 return (SET_ERROR(EINVAL));
1662
1663 VERIFY(0 == dmu_bonus_hold(os, drrs->drr_object, FTAG, &db));
1664 if ((err = dmu_spill_hold_by_bonus(db, FTAG, &db_spill)) != 0) {
1665 dmu_buf_rele(db, FTAG);
1666 return (err);
1667 }
1668
1669 tx = dmu_tx_create(os);
1670
1671 dmu_tx_hold_spill(tx, db->db_object);
1672
1673 err = dmu_tx_assign(tx, TXG_WAIT);
1674 if (err != 0) {
1675 dmu_buf_rele(db, FTAG);
1676 dmu_buf_rele(db_spill, FTAG);
1677 dmu_tx_abort(tx);
1678 return (err);
1679 }
1680 dmu_buf_will_dirty(db_spill, tx);
1681
1682 if (db_spill->db_size < drrs->drr_length)
1683 VERIFY(0 == dbuf_spill_set_blksz(db_spill,
1684 drrs->drr_length, tx));
1685 bcopy(data, db_spill->db_data, drrs->drr_length);
1686
1687 dmu_buf_rele(db, FTAG);
1688 dmu_buf_rele(db_spill, FTAG);
1689
1690 dmu_tx_commit(tx);
1691 return (0);
1692}
1693
1694/* ARGSUSED */
1695static int
1696restore_free(struct restorearg *ra, objset_t *os,
1697 struct drr_free *drrf)
1698{
1699 int err;
1700
1701 if (drrf->drr_length != -1ULL &&
1702 drrf->drr_offset + drrf->drr_length < drrf->drr_offset)
1703 return (SET_ERROR(EINVAL));
1704
1705 if (dmu_object_info(os, drrf->drr_object, NULL) != 0)
1706 return (SET_ERROR(EINVAL));
1707
1708 err = dmu_free_long_range(os, drrf->drr_object,
1709 drrf->drr_offset, drrf->drr_length);
1710 return (err);
1711}
1712
1713/* used to destroy the drc_ds on error */
1714static void
1715dmu_recv_cleanup_ds(dmu_recv_cookie_t *drc)
1716{
1717 char name[MAXNAMELEN];
1718 dsl_dataset_name(drc->drc_ds, name);
1719 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
1720 (void) dsl_destroy_head(name);
1721}
1722
1723/*
1724 * NB: callers *must* call dmu_recv_end() if this succeeds.
1725 */
1726int
1727dmu_recv_stream(dmu_recv_cookie_t *drc, struct file *fp, offset_t *voffp,
1728 int cleanup_fd, uint64_t *action_handlep)
1729{
1730 struct restorearg ra = { 0 };
1731 dmu_replay_record_t *drr;
1732 objset_t *os;
1733 zio_cksum_t pcksum;
1734 int featureflags;
1735
1736 ra.byteswap = drc->drc_byteswap;
1737 ra.cksum = drc->drc_cksum;
1738 ra.td = curthread;
1739 ra.fp = fp;
1740 ra.voff = *voffp;
1741 ra.bufsize = 1<<20;
1742 ra.buf = kmem_alloc(ra.bufsize, KM_SLEEP);
1743
1744 /* these were verified in dmu_recv_begin */
1745 ASSERT3U(DMU_GET_STREAM_HDRTYPE(drc->drc_drrb->drr_versioninfo), ==,
1746 DMU_SUBSTREAM);
1747 ASSERT3U(drc->drc_drrb->drr_type, <, DMU_OST_NUMTYPES);
1748
1749 /*
1750 * Open the objset we are modifying.
1751 */
1752 VERIFY0(dmu_objset_from_ds(drc->drc_ds, &os));
1753
1754 ASSERT(drc->drc_ds->ds_phys->ds_flags & DS_FLAG_INCONSISTENT);
1755
1756 featureflags = DMU_GET_FEATUREFLAGS(drc->drc_drrb->drr_versioninfo);
1757
1758 /* if this stream is dedup'ed, set up the avl tree for guid mapping */
1759 if (featureflags & DMU_BACKUP_FEATURE_DEDUP) {
1760 minor_t minor;
1761
1762 if (cleanup_fd == -1) {
1763 ra.err = SET_ERROR(EBADF);
1764 goto out;
1765 }
1766 ra.err = zfs_onexit_fd_hold(cleanup_fd, &minor);
1767 if (ra.err != 0) {
1768 cleanup_fd = -1;
1769 goto out;
1770 }
1771
1772 if (*action_handlep == 0) {
1773 ra.guid_to_ds_map =
1774 kmem_alloc(sizeof (avl_tree_t), KM_SLEEP);
1775 avl_create(ra.guid_to_ds_map, guid_compare,
1776 sizeof (guid_map_entry_t),
1777 offsetof(guid_map_entry_t, avlnode));
1778 ra.err = zfs_onexit_add_cb(minor,
1779 free_guid_map_onexit, ra.guid_to_ds_map,
1780 action_handlep);
1781 if (ra.err != 0)
1782 goto out;
1783 } else {
1784 ra.err = zfs_onexit_cb_data(minor, *action_handlep,
1785 (void **)&ra.guid_to_ds_map);
1786 if (ra.err != 0)
1787 goto out;
1788 }
1789
1790 drc->drc_guid_to_ds_map = ra.guid_to_ds_map;
1791 }
1792
1793 /*
1794 * Read records and process them.
1795 */
1796 pcksum = ra.cksum;
1797 while (ra.err == 0 &&
1798 NULL != (drr = restore_read(&ra, sizeof (*drr)))) {
1799 if (issig(JUSTLOOKING) && issig(FORREAL)) {
1800 ra.err = SET_ERROR(EINTR);
1801 goto out;
1802 }
1803
1804 if (ra.byteswap)
1805 backup_byteswap(drr);
1806
1807 switch (drr->drr_type) {
1808 case DRR_OBJECT:
1809 {
1810 /*
1811 * We need to make a copy of the record header,
1812 * because restore_{object,write} may need to
1813 * restore_read(), which will invalidate drr.
1814 */
1815 struct drr_object drro = drr->drr_u.drr_object;
1816 ra.err = restore_object(&ra, os, &drro);
1817 break;
1818 }
1819 case DRR_FREEOBJECTS:
1820 {
1821 struct drr_freeobjects drrfo =
1822 drr->drr_u.drr_freeobjects;
1823 ra.err = restore_freeobjects(&ra, os, &drrfo);
1824 break;
1825 }
1826 case DRR_WRITE:
1827 {
1828 struct drr_write drrw = drr->drr_u.drr_write;
1829 ra.err = restore_write(&ra, os, &drrw);
1830 break;
1831 }
1832 case DRR_WRITE_BYREF:
1833 {
1834 struct drr_write_byref drrwbr =
1835 drr->drr_u.drr_write_byref;
1836 ra.err = restore_write_byref(&ra, os, &drrwbr);
1837 break;
1838 }
1839 case DRR_WRITE_EMBEDDED:
1840 {
1841 struct drr_write_embedded drrwe =
1842 drr->drr_u.drr_write_embedded;
1843 ra.err = restore_write_embedded(&ra, os, &drrwe);
1844 break;
1845 }
1846 case DRR_FREE:
1847 {
1848 struct drr_free drrf = drr->drr_u.drr_free;
1849 ra.err = restore_free(&ra, os, &drrf);
1850 break;
1851 }
1852 case DRR_END:
1853 {
1854 struct drr_end drre = drr->drr_u.drr_end;
1855 /*
1856 * We compare against the *previous* checksum
1857 * value, because the stored checksum is of
1858 * everything before the DRR_END record.
1859 */
1860 if (!ZIO_CHECKSUM_EQUAL(drre.drr_checksum, pcksum))
1861 ra.err = SET_ERROR(ECKSUM);
1862 goto out;
1863 }
1864 case DRR_SPILL:
1865 {
1866 struct drr_spill drrs = drr->drr_u.drr_spill;
1867 ra.err = restore_spill(&ra, os, &drrs);
1868 break;
1869 }
1870 default:
1871 ra.err = SET_ERROR(EINVAL);
1872 goto out;
1873 }
1874 pcksum = ra.cksum;
1875 }
1876 ASSERT(ra.err != 0);
1877
1878out:
1879 if ((featureflags & DMU_BACKUP_FEATURE_DEDUP) && (cleanup_fd != -1))
1880 zfs_onexit_fd_rele(cleanup_fd);
1881
1882 if (ra.err != 0) {
1883 /*
1884 * destroy what we created, so we don't leave it in the
1885 * inconsistent restoring state.
1886 */
1887 dmu_recv_cleanup_ds(drc);
1888 }
1889
1890 kmem_free(ra.buf, ra.bufsize);
1891 *voffp = ra.voff;
1892 return (ra.err);
1893}
1894
1895static int
1896dmu_recv_end_check(void *arg, dmu_tx_t *tx)
1897{
1898 dmu_recv_cookie_t *drc = arg;
1899 dsl_pool_t *dp = dmu_tx_pool(tx);
1900 int error;
1901
1902 ASSERT3P(drc->drc_ds->ds_owner, ==, dmu_recv_tag);
1903
1904 if (!drc->drc_newfs) {
1905 dsl_dataset_t *origin_head;
1906
1907 error = dsl_dataset_hold(dp, drc->drc_tofs, FTAG, &origin_head);
1908 if (error != 0)
1909 return (error);
1910 if (drc->drc_force) {
1911 /*
1912 * We will destroy any snapshots in tofs (i.e. before
1913 * origin_head) that are after the origin (which is
1914 * the snap before drc_ds, because drc_ds can not
1915 * have any snaps of its own).
1916 */
1917 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1918 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1919 dsl_dataset_t *snap;
1920 error = dsl_dataset_hold_obj(dp, obj, FTAG,
1921 &snap);
1922 if (error != 0)
1923 return (error);
1924 if (snap->ds_dir != origin_head->ds_dir)
1925 error = SET_ERROR(EINVAL);
1926 if (error == 0) {
1927 error = dsl_destroy_snapshot_check_impl(
1928 snap, B_FALSE);
1929 }
1930 obj = snap->ds_phys->ds_prev_snap_obj;
1931 dsl_dataset_rele(snap, FTAG);
1932 if (error != 0)
1933 return (error);
1934 }
1935 }
1936 error = dsl_dataset_clone_swap_check_impl(drc->drc_ds,
1937 origin_head, drc->drc_force, drc->drc_owner, tx);
1938 if (error != 0) {
1939 dsl_dataset_rele(origin_head, FTAG);
1940 return (error);
1941 }
1942 error = dsl_dataset_snapshot_check_impl(origin_head,
1943 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1944 dsl_dataset_rele(origin_head, FTAG);
1945 if (error != 0)
1946 return (error);
1947
1948 error = dsl_destroy_head_check_impl(drc->drc_ds, 1);
1949 } else {
1950 error = dsl_dataset_snapshot_check_impl(drc->drc_ds,
1951 drc->drc_tosnap, tx, B_TRUE, 1, drc->drc_cred);
1952 }
1953 return (error);
1954}
1955
1956static void
1957dmu_recv_end_sync(void *arg, dmu_tx_t *tx)
1958{
1959 dmu_recv_cookie_t *drc = arg;
1960 dsl_pool_t *dp = dmu_tx_pool(tx);
1961
1962 spa_history_log_internal_ds(drc->drc_ds, "finish receiving",
1963 tx, "snap=%s", drc->drc_tosnap);
1964
1965 if (!drc->drc_newfs) {
1966 dsl_dataset_t *origin_head;
1967
1968 VERIFY0(dsl_dataset_hold(dp, drc->drc_tofs, FTAG,
1969 &origin_head));
1970
1971 if (drc->drc_force) {
1972 /*
1973 * Destroy any snapshots of drc_tofs (origin_head)
1974 * after the origin (the snap before drc_ds).
1975 */
1976 uint64_t obj = origin_head->ds_phys->ds_prev_snap_obj;
1977 while (obj != drc->drc_ds->ds_phys->ds_prev_snap_obj) {
1978 dsl_dataset_t *snap;
1979 VERIFY0(dsl_dataset_hold_obj(dp, obj, FTAG,
1980 &snap));
1981 ASSERT3P(snap->ds_dir, ==, origin_head->ds_dir);
1982 obj = snap->ds_phys->ds_prev_snap_obj;
1983 dsl_destroy_snapshot_sync_impl(snap,
1984 B_FALSE, tx);
1985 dsl_dataset_rele(snap, FTAG);
1986 }
1987 }
1988 VERIFY3P(drc->drc_ds->ds_prev, ==,
1989 origin_head->ds_prev);
1990
1991 dsl_dataset_clone_swap_sync_impl(drc->drc_ds,
1992 origin_head, tx);
1993 dsl_dataset_snapshot_sync_impl(origin_head,
1994 drc->drc_tosnap, tx);
1995
1996 /* set snapshot's creation time and guid */
1997 dmu_buf_will_dirty(origin_head->ds_prev->ds_dbuf, tx);
1998 origin_head->ds_prev->ds_phys->ds_creation_time =
1999 drc->drc_drrb->drr_creation_time;
2000 origin_head->ds_prev->ds_phys->ds_guid =
2001 drc->drc_drrb->drr_toguid;
2002 origin_head->ds_prev->ds_phys->ds_flags &=
2003 ~DS_FLAG_INCONSISTENT;
2004
2005 dmu_buf_will_dirty(origin_head->ds_dbuf, tx);
2006 origin_head->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
2007
2008 dsl_dataset_rele(origin_head, FTAG);
2009 dsl_destroy_head_sync_impl(drc->drc_ds, tx);
2010
2011 if (drc->drc_owner != NULL)
2012 VERIFY3P(origin_head->ds_owner, ==, drc->drc_owner);
2013 } else {
2014 dsl_dataset_t *ds = drc->drc_ds;
2015
2016 dsl_dataset_snapshot_sync_impl(ds, drc->drc_tosnap, tx);
2017
2018 /* set snapshot's creation time and guid */
2019 dmu_buf_will_dirty(ds->ds_prev->ds_dbuf, tx);
2020 ds->ds_prev->ds_phys->ds_creation_time =
2021 drc->drc_drrb->drr_creation_time;
2022 ds->ds_prev->ds_phys->ds_guid = drc->drc_drrb->drr_toguid;
2023 ds->ds_prev->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
2024
2025 dmu_buf_will_dirty(ds->ds_dbuf, tx);
2026 ds->ds_phys->ds_flags &= ~DS_FLAG_INCONSISTENT;
2027 }
2028 drc->drc_newsnapobj = drc->drc_ds->ds_phys->ds_prev_snap_obj;
2029 /*
2030 * Release the hold from dmu_recv_begin. This must be done before
2031 * we return to open context, so that when we free the dataset's dnode,
2032 * we can evict its bonus buffer.
2033 */
2034 dsl_dataset_disown(drc->drc_ds, dmu_recv_tag);
2035 drc->drc_ds = NULL;
2036}
2037
2038static int
2039add_ds_to_guidmap(const char *name, avl_tree_t *guid_map, uint64_t snapobj)
2040{
2041 dsl_pool_t *dp;
2042 dsl_dataset_t *snapds;
2043 guid_map_entry_t *gmep;
2044 int err;
2045
2046 ASSERT(guid_map != NULL);
2047
2048 err = dsl_pool_hold(name, FTAG, &dp);
2049 if (err != 0)
2050 return (err);
2051 gmep = kmem_alloc(sizeof (*gmep), KM_SLEEP);
2052 err = dsl_dataset_hold_obj(dp, snapobj, gmep, &snapds);
2053 if (err == 0) {
2054 gmep->guid = snapds->ds_phys->ds_guid;
2055 gmep->gme_ds = snapds;
2056 avl_add(guid_map, gmep);
2057 dsl_dataset_long_hold(snapds, gmep);
2058 } else
2059 kmem_free(gmep, sizeof (*gmep));
2060
2061 dsl_pool_rele(dp, FTAG);
2062 return (err);
2063}
2064
2065static int dmu_recv_end_modified_blocks = 3;
2066
2067static int
2068dmu_recv_existing_end(dmu_recv_cookie_t *drc)
2069{
2070 int error;
2071 char name[MAXNAMELEN];
2072
2073#ifdef _KERNEL
2074 /*
2075 * We will be destroying the ds; make sure its origin is unmounted if
2076 * necessary.
2077 */
2078 dsl_dataset_name(drc->drc_ds, name);
2079 zfs_destroy_unmount_origin(name);
2080#endif
2081
2082 error = dsl_sync_task(drc->drc_tofs,
2083 dmu_recv_end_check, dmu_recv_end_sync, drc,
2084 dmu_recv_end_modified_blocks);
2085
2086 if (error != 0)
2087 dmu_recv_cleanup_ds(drc);
2088 return (error);
2089}
2090
2091static int
2092dmu_recv_new_end(dmu_recv_cookie_t *drc)
2093{
2094 int error;
2095
2096 error = dsl_sync_task(drc->drc_tofs,
2097 dmu_recv_end_check, dmu_recv_end_sync, drc,
2098 dmu_recv_end_modified_blocks);
2099
2100 if (error != 0) {
2101 dmu_recv_cleanup_ds(drc);
2102 } else if (drc->drc_guid_to_ds_map != NULL) {
2103 (void) add_ds_to_guidmap(drc->drc_tofs,
2104 drc->drc_guid_to_ds_map,
2105 drc->drc_newsnapobj);
2106 }
2107 return (error);
2108}
2109
2110int
2111dmu_recv_end(dmu_recv_cookie_t *drc, void *owner)
2112{
2113 drc->drc_owner = owner;
2114
2115 if (drc->drc_newfs)
2116 return (dmu_recv_new_end(drc));
2117 else
2118 return (dmu_recv_existing_end(drc));
2119}
2120
2121/*
2122 * Return TRUE if this objset is currently being received into.
2123 */
2124boolean_t
2125dmu_objset_is_receiving(objset_t *os)
2126{
2127 return (os->os_dsl_dataset != NULL &&
2128 os->os_dsl_dataset->ds_owner == dmu_recv_tag);
2129}
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