最近在看东辉主防和A盾代码，有一些手动下发IRP的代码，不是很懂，就翻开WDK看了下处理IRP的相关章节，顺便做了翻译。
翻译的应该还是比较通顺的，但我也是内核新手，有些地方不是很明白。对于有可能翻译错误的地方，译文后都备有原文，这些地方推荐读原文，以免被误导了。另外，我把翻译过程中的疑问整理如下，希望有大牛可以解答，然后我会更新一下文档。
Handling IRPs
The Life of an I/O Request
Example I/O Request - The Details
原句：If they are, the driver usually calls I/O support routines to tell the I/O manager that a device operation is pending on the IRP
疑问："a device operation is pending on the IRP"，这句该如何翻译？
原句：Each driver-created device object represents a physical, logical, or virtual device for which a particular driver carries out I/O requests.
疑问：“for which a particular driver carries out I/O requests”，这句该如何翻译？
Completing IRPs
Using IoCompletion Routines
Implementing an IoCompletion Routine
原句：When the IoCompletion routine has processed and freed the driver-allocated IRP, the routine must return control with STATUS_MORE_PROCESSING_REQUIRED.
疑问：“return control”，是把控制权返回给谁了？是指通过设置事件，然后返回STATUS_MORE_PROCESSING_REQUIRED，把控制权返回给派遣例程？
Using I/O Control Codes
Creating IOCTL Requests in Drivers
原句：With the exception of certain SCSI requests, the buffers at Irp->AssociatedIrp.SystemBuffer, at Irp->MdlAddress, and at Parameters.DeviceIoControl.Type3InputBuffer in a driver's I/O stack location do not contain pointers to other data buffers, nor do they contain structures that contain pointers, for system-defined I/O control codes
疑问："do not contain pointers to other data buffers"，原意是不包含指向其他数据缓冲区的指针。但是，上面列举的几个属性，不都是（直接或间接）指向数据缓冲区的指针么？还是说“其他数据缓冲区”有什么具体的含义？
Defining I/O Control Codes
原句：Note that the vendor-assigned values set the Common bit. / Note that the vendor-assigned values set the Custom bit.
疑问：是指，根据是系统定义的，还是供应商提供的，来设置Common/Custom位为0或者1吗？
IRP Processing Examples
Processing IRPs in an Intermediate-Level Driver
原句：because the IRP is not associated with a thread, its completion processing should end with the driver that created it.
疑问："completion processing should end with the driver that created it"，completion processing，是IO管理器来做的吧？这句是啥意思？
