Memory Objects and Buffers for Driver-Created I/O Requests
Every driver-created I/O request object requires one or more memory objects that describe the I/O buffers for the request. The driver must supply the memory objects and the buffers for the I/O request and format the request before sending it.
The drivers that handle an I/O request read from and write to the buffers that are supplied in the request. For a read request, an output buffer provides a place for the I/O target to return the requested data. For a write request, an input buffer supplies the data to be written. A device I/O control request can have one buffer for input and another buffer for output or it can use the same buffer for both.
Figure 9-2 shows the relationships among the ...
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