.

wcfs/δbtail.go

@@ -252,8 +252,9 @@ type ΔTree struct {
 func NewΔBtail(at0 zodb.Tid, db *zodb.DB) *ΔBtail {
 	return &ΔBtail{
 		δZtail:   zodb.NewΔTail(at0),
-		byRoot:   make(map[zodb.Oid]*ΔTtail),
+		byRoot:   map[zodb.Oid]*ΔTtail{},
 		trackIdx: map[zodb.Oid]nodeTrack{},
+		holeIdx:  treeSetKey{SetKey{}},
 		db:       db,
 	}
 }
@@ -333,11 +334,15 @@ func (δBtail *ΔBtail) Track(key Key, keyPresent bool, path []Node, flags Track
 
 	// remember missing keys in track of leaf node (bucket or top-level ø tree)
 	if !keyPresent {
+		δBtail.holeIdx.Add(key)
 		track.holes.Add(key)
 	} else {
 		if track.holes.Has(key) {
 			panicf("[%v] was previously requested to be tracked as ø", key)
 		}
+		if δBtail.holeIdx.Has(key) {
+			panicf("[%v] was previously requested to be tracked as ø", key)
+		}
 	}