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Low I/O Routines

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Low I/O routines represent the basic IRP_MJ_XXX asynchronous operations on a file object (open, close, read, and write, for example). RDBSS provides some convenience routines that are used with low I/O operations by a network mini-redirector. The RDBSS low I/O routines include the following:

Routine Description

RxLowIoCompletion

This routine must be called by the low I/O routines of a network mini-redirector driver when processing is complete, if the routine initially returned as pending.

RxLowIoGetBufferAddress

This routine returns the buffer that corresponds to the MDL from the LowIoContext structure of an RX_CONTEXT structure.

RxMapSystemBuffer

This routine returns the system buffer address from the I/O request packet (IRP).

RxNewMapUserBuffer

This routine returns the address of the user buffer used for low I/O. Note that this routine is only available on Windows XP and Windows 2000.