2．7．5下拉控制寄存器（IoCB） 表2．5 IOCB Bit0（PDO）：P50管脚的下拉使能控制位， 内部下拉禁止； Bitl（PDl）：P51管脚的下拉使能控制位， 。
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Here, iocb is, of course, the iocb you were given when the request was initiated.
当然，这里的iocb就是发起请求时的iocb。
Once you have called aio_complete(), you no longer own the IOCB or the user buffer, and should not touch them again.
一旦调用aio_complete()，驱动程序就不再拥有IOCB或者用户缓冲区了，不应该再触碰它们。
The iocb argument can usually be treated as an opaque cookie used by the AIO subsystem; if you need the struct file pointer for this file descriptor, however, you can find it as iocb->ki_filp.
通常可以把iocb看作AIO子系统使用的不透明数据结构。 然而，如果需要文件描述符的struct file指针，可以通过iocb->ki_flip获取。
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