ovl_path_upper
ovl_path_upper(c->dentry, &upperpath);
ovl_path_upper(parent, &parentpath);
ovl_path_upper(dentry->d_parent, &realparentpath);
ovl_path_upper(dentry, &upperpath);
ovl_path_upper(dentry, &upperpath);
ovl_path_upper(dentry, path);
void ovl_path_upper(struct dentry *dentry, struct path *path);
ovl_path_upper(path->dentry, &realpath);
ovl_path_upper(dentry, &upperpath);
ovl_path_upper(dentry, path);
ovl_path_upper(dentry, path);