FltGetNewSystemBufferAddress - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// fltkernel.h
PVOID FLTAPI FltGetNewSystemBufferAddress(
[in] PFLT_CALLBACK_DATA CallbackData
);
View the official Windows Driver Kit DDI referenceNo description available.
The FltGetNewSystemBufferAddress function retrieves the AssociatedIrp.SystemBuffer buffer, which the file system has allocated. A minifilter driver's post-callback routine calls this function.
CallbackData [in]A pointer to a FLT_CALLBACK_DATA structure that represents an I/O operation.
If the AssociatedIrp.SystemBuffer buffer was allocated by the file system, FltGetNewSystemBufferAddress returns a pointer to this buffer; otherwise it returns NULL.
A minifilter driver's post-callback routine calls FltGetNewSystemBufferAddress function to retrieve a pointer to the AssociatedIrp.SystemBuffer buffer that the file system has allocated. A minifilter driver should call this function only when the FLTFL_CALLBACK_DATA_NEW_SYSTEM_BUFFER flag is set in CallbackData.Flags.
When the file system allocates its own AssociatedIrp.SystemBuffer buffer, Filter Manager will set the FLTFL_CALLBACK_DATA_NEW_SYSTEM_BUFFER flag. This signals the minifilter that the buffer they received in the pre-operation is not the one that has the data read from the file system.
If the FLTFL_CALLBACK_DATA_NEW_SYSTEM_BUFFER flag is not set, then this routine returns NULL.