mtd_panic_write
err = mtd_panic_write(subdev, to, size, &retsize, buf);
EXPORT_SYMBOL_GPL(mtd_panic_write);
ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
ret = mtd_panic_write(cxt->mtd, off, size, &retlen, (u_char *)buf);
int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,