Do mini-filter functions need APCs enabled?

Posted by botismarius on Stack Overflow See other posts from Stack Overflow or by botismarius
Published on 2010-05-04T11:33:01Z Indexed on 2010/05/04 11:38 UTC
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mini-filter

Hello,

Many Zw* functions that work with files (such as ZwCreateFile) need to be called at PASSIVE_LEVEL with APCs enabled: http://msdn.microsoft.com/en-us/library/ff566424%28VS.85%29.aspx. This is because, internally, I/O operations are asynchronously and the completion of an operation is delivered through an APC (correct me if I'm wrong).

However, the documentation for similar functions from a mini-filter (such as FltCreateFile, FltReadFile, etc) does not specify that APCs should be enabled. Is it safe to call FltCreateFile/FltReadFile with APCs disabled?

Thanks!

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