resolved some comments

Signed-off-by: Xiaoxuan Wang <[email protected]>

Author: wangxiaoxuan273

content/oci/oci.go

@@ -467,7 +467,7 @@ func (s *Store) GC(ctx context.Context) error {
 	defer s.sync.Unlock()
 
 	// clean up dangling layers in Store
-	danglings := s.graph.GetDanglingLayers()
+	danglings := s.graph.GetUnreferencedRootNodes()
 	for _, desc := range danglings {
 		// do not remove existing manifests in the index
 		if _, err := s.tagResolver.Resolve(ctx, string(desc.Digest)); err == errdef.ErrNotFound {

internal/graph/memory.go

@@ -183,8 +183,8 @@ func (m *Memory) Exists(dgst digest.Digest) bool {
 	return exists
 }
 
-// GetDanglingLayers returns the dangling (unreferenced) layer nodes in the memory.
-func (m *Memory) GetDanglingLayers() []ocispec.Descriptor {
+// GetUnreferencedRootNodes returns the dangling (unreferenced) layer nodes in the memory.
+func (m *Memory) GetUnreferencedRootNodes() []ocispec.Descriptor {
 	var danglings []ocispec.Descriptor
 	for key, desc := range m.nodes {
 		if _, exist := m.predecessors[key]; !exist {