84ff27bc___Building_IRPs_to_Perform_I_O__Purpose
[Flag] SL_RETURN_SINGLE_ENTRY [Associated I/O Operation] DIRECTORY_CONTROL_QUERY_EA [Purpose] 
At most one entry should be returned to the caller as a result of querying the directory or EA contents.
The NT Insider:Rolling Your Own - Building IRPs to Perform I/O
Purpose