kiocb_write_and_wait
ret = kiocb_write_and_wait(iocb, count);
ret = kiocb_write_and_wait(iocb, iomi.len);
ret = kiocb_write_and_wait(iocb, orig_count);
int kiocb_write_and_wait(struct kiocb *iocb, size_t count);
EXPORT_SYMBOL_GPL(kiocb_write_and_wait);
retval = kiocb_write_and_wait(iocb, count);