IRP-Based I/O Operations That Always Use Neither Buffered Nor Direct I/O
The following IRP-based I/O operations always use neither buffered nor direct I/O, regardless of the value of the Flags member of the DEVICE_OBJECT structure for the file system volume:
IRP_MJ_PNP
IRP_MJ_QUERY_SECURITY
IRP_MJ_SET_SECURITY
IRP_MJ_SYSTEM_CONTROL
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