1 files changed, 75 insertions, 0 deletions
diff --git a/lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuild_treecb.go b/lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuild_treecb.go
new file mode 100644
index 0000000..7266777
--- /dev/null
+++ b/lib/btrfsprogs/btrfsinspect/rebuildnodes/rebuild_treecb.go
@@ -0,0 +1,75 @@
+// Copyright (C) 2022-2023  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package rebuildnodes
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/datawire/dlib/dlog"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsitem"
+	"git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim"
+)
+
+func (o *rebuilder) cbAddedItem(ctx context.Context, tree btrfsprim.ObjID, key btrfsprim.Key) {
+	if handleWouldBeNoOp(key.ItemType) {
+		return
+	}
+	o.itemQueue.Insert(keyAndTree{
+		TreeID: tree,
+		Key:    key,
+	})
+}
+
+func (o *rebuilder) cbLookupRoot(ctx context.Context, tree btrfsprim.ObjID) (offset btrfsprim.Generation, item btrfsitem.Root, ok bool) {
+	ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.reason", "tree Root")
+	key := keyAndTree{
+		TreeID: btrfsprim.ROOT_TREE_OBJECTID,
+		Key: btrfsprim.Key{
+			ObjectID: tree,
+			ItemType: btrfsitem.ROOT_ITEM_KEY,
+		},
+	}
+	wantKey := fmt.Sprintf("tree=%v key={%v %v ?}", key.TreeID, key.ObjectID, key.ItemType)
+	ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.key", wantKey)
+	key.Key, ok = o._want(ctx, key.TreeID, wantKey, key.ObjectID, key.ItemType)
+	if !ok {
+		o.enqueueRetry()
+		return 0, btrfsitem.Root{}, false
+	}
+	switch itemBody := o.rebuilt.Tree(ctx, key.TreeID).ReadItem(ctx, key.Key).(type) {
+	case *btrfsitem.Root:
+		return btrfsprim.Generation(key.Offset), *itemBody, true
+	case *btrfsitem.Error:
+		o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", key, 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))
+	}
+}
+
+func (o *rebuilder) cbLookupUUID(ctx context.Context, uuid btrfsprim.UUID) (id btrfsprim.ObjID, ok bool) {
+	ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.reason", "resolve parent UUID")
+	key := keyAndTree{TreeID: btrfsprim.UUID_TREE_OBJECTID, Key: btrfsitem.UUIDToKey(uuid)}
+	ctx = dlog.WithField(ctx, "btrfsinspect.rebuild-nodes.rebuild.add-tree.want.key", key.String())
+	if !o._wantOff(ctx, key.TreeID, key.String(), key.Key) {
+		o.enqueueRetry()
+		return 0, false
+	}
+	switch itemBody := o.rebuilt.Tree(ctx, key.TreeID).ReadItem(ctx, key.Key).(type) {
+	case *btrfsitem.UUIDMap:
+		return itemBody.ObjID, true
+	case *btrfsitem.Error:
+		o.fsErr(ctx, fmt.Errorf("error decoding item: %v: %w", key, 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))
+	}
+}