ubifs_wbuf_write_nolock
err = ubifs_wbuf_write_nolock(wbuf, snod->node, snod->len);
err = ubifs_wbuf_write_nolock(wbuf, auth,
err = ubifs_wbuf_write_nolock(wbuf, buf, len);
int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len);