1 files changed, 86 insertions, 0 deletions
diff --git a/cmd/btrfs-rec/inspect/rebuildtrees/rebuild_treecb.go b/cmd/btrfs-rec/inspect/rebuildtrees/rebuild_treecb.go
new file mode 100644
index 0000000..492436b
--- /dev/null
+++ b/cmd/btrfs-rec/inspect/rebuildtrees/rebuild_treecb.go
@@ -0,0 +1,86 @@
+// Copyright (C) 2022-2023  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package rebuildnodes
+
+import (
+	"context"
+	"fmt"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsvol"
+)
+
+// AddedItem implements btrees.Callbacks.
+func (o *rebuilder) AddedItem(ctx context.Context, tree btrfsprim.ObjID, key btrfsprim.Key) {
+	o.addedItemQueue.Insert(keyAndTree{
+		TreeID: tree,
+		Key:    key,
+	})
+}
+
+// AddedRoot implements btrees.Callbacks.
+func (o *rebuilder) AddedRoot(ctx context.Context, tree btrfsprim.ObjID, root btrfsvol.LogicalAddr) {
+	if retries := o.retryItemQueue[tree]; retries != nil {
+		o.addedItemQueue.InsertFrom(retries)
+	}
+}
+
+// LookupRoot implements btrees.Callbacks.
+func (o *rebuilder) LookupRoot(ctx context.Context, tree btrfsprim.ObjID) (offset btrfsprim.Generation, item btrfsitem.Root, ok bool) {
+	wantKey := WantWithTree{
+		TreeID: btrfsprim.ROOT_TREE_OBJECTID,
+		Key: Want{
+			ObjectID:   tree,
+			ItemType:   btrfsitem.ROOT_ITEM_KEY,
+			OffsetType: offsetAny,
+		},
+	}
+	ctx = withWant(ctx, logFieldTreeWant, "tree Root", wantKey)
+	foundKey, ok := o._want(ctx, wantKey)
+	if !ok {
+		o.enqueueRetry(btrfsprim.ROOT_TREE_OBJECTID)
+		return 0, btrfsitem.Root{}, false
+	}
+	itemBody := o.rebuilt.Tree(ctx, wantKey.TreeID).ReadItem(ctx, foundKey)
+	defer itemBody.Free()
+	switch itemBody := itemBody.(type) {
+	case *btrfsitem.Root:
+		return btrfsprim.Generation(foundKey.Offset), *itemBody, true
+	case *btrfsitem.Error:
+		o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", foundKey, itemBody.Err))
+		return 0, btrfsitem.Root{}, false
+	default:
+		// This is a panic because the item decoder should not emit ROOT_ITEM items as anything but
+		// btrfsitem.Root or btrfsitem.Error without this code also being updated.
+		panic(fmt.Errorf("should not happen: ROOT_ITEM item has unexpected type: %T", itemBody))
+	}
+}
+
+// LookupUUID implements btrees.Callbacks.
+func (o *rebuilder) LookupUUID(ctx context.Context, uuid btrfsprim.UUID) (id btrfsprim.ObjID, ok bool) {
+	wantKey := WantWithTree{
+		TreeID: btrfsprim.UUID_TREE_OBJECTID,
+		Key:    wantFromKey(btrfsitem.UUIDToKey(uuid)),
+	}
+	ctx = withWant(ctx, logFieldTreeWant, "resolve parent UUID", wantKey)
+	if !o._wantOff(ctx, wantKey) {
+		o.enqueueRetry(btrfsprim.UUID_TREE_OBJECTID)
+		return 0, false
+	}
+	itemBody := o.rebuilt.Tree(ctx, wantKey.TreeID).ReadItem(ctx, wantKey.Key.Key())
+	defer itemBody.Free()
+	switch itemBody := itemBody.(type) {
+	case *btrfsitem.UUIDMap:
+		return itemBody.ObjID, true
+	case *btrfsitem.Error:
+		o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", wantKey, itemBody.Err))
+		return 0, false
+	default:
+		// This is a panic because the item decoder should not emit UUID_SUBVOL items as anything but
+		// btrfsitem.UUIDMap or btrfsitem.Error without this code also being updated.
+		panic(fmt.Errorf("should not happen: UUID_SUBVOL item has unexpected type: %T", itemBody))
+	}
+}