ssize_t uread(struct file *file, char __user *buf, size_t count, loff_t *pos)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,19,0)
	return p__vfs_read(file, buf, count, pos);
#endif
	if (file->f_op->read)
		return file->f_op->read(file, buf, count, pos);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0)
	if (file->f_op->aio_read)
		return do_sync_read(file, buf, count, pos);
	if (file->f_op->read_iter)
		return new_sync_read(file, buf, count, pos);
	return  -EINVAL;
#else
	return  do_sync_read(file, buf, count, pos);
#endif
}