__kernel_write
wr = __kernel_write(file, data, bytes, NULL);
n = __kernel_write(file, addr, nr, &pos);
EXPORT_SYMBOL_GPL(__kernel_write);
ret = __kernel_write(file, buf, count, pos);
extern ssize_t __kernel_write(struct file *, const void *, size_t, loff_t *);
__kernel_write(file, ac, sizeof(acct_t), &pos);