rem: static void insert_cookie_in_jar(struct rootfs_vnode *dir, struct rootfs_cookie *cookie)
add: insert_cookie_in_jar(struct rootfs_vnode *dir, struct rootfs_cookie *cookie)
context: static void insert_cookie_in_jar(struct rootfs_vnode *dir, struct rootfs_cookie *cookie){	cookie->next = dir->stream.dir.jar_head;	dir->stream.dir.jar_head = cookie;	cookie->prev = NULL;}