Method link

fs/subfs.cpp:142–147

            return underlayfs->readlink(path, buf, bufsiz);
        }
        virtual int link(const char *oldname, const char *newname) override
        {
            PathCat __(this, oldname);
            PathCat ___(this, newname);
            return underlayfs->link(oldname, newname);
        }
        virtual int rename(const char *oldname, const char *newname) override
        {
            PathCat __(this, oldname);