vfs: fix race condition caused by unlocked reading of Dir.path

vfs/dir.go

@@ -476,15 +476,16 @@ func (d *Dir) Stat(name string) (node Node, err error) {
 func (d *Dir) ReadDirAll() (items Nodes, err error) {
 	// fs.Debugf(d.path, "Dir.ReadDirAll")
 	d.mu.Lock()
-	defer d.mu.Unlock()
 	err = d._readDir()
 	if err != nil {
 		fs.Debugf(d.path, "Dir.ReadDirAll error: %v", err)
+		d.mu.Unlock()
 		return nil, err
 	}
 	for _, item := range d.items {
 		items = append(items, item)
 	}
+	d.mu.Unlock()
 	sort.Sort(items)
 	// fs.Debugf(d.path, "Dir.ReadDirAll OK with %d entries", len(items))
 	return items, nil

vfs/file.go

@@ -91,7 +91,7 @@ func (f *File) Name() (name string) {
 // _path returns the full path of the file
 // use when lock is held
 func (f *File) _path() string {
-	return path.Join(f.d.path, f.leaf)
+	return path.Join(f.d.Path(), f.leaf)
 }
 
 // Path returns the full path of the file