![]() ![]() Legacy file system filter Reduces the complexity of IO system through new interfaces and library routines Has kernel and user-mode interfaces © 2004 Microsoft Corporation. All rights reserved.ĥ The Filter Manager addresses all of these Issues All rights reserved.Ĥ Problems with today’s Filter Model (cont)Ĭomplex interfaces Difficult to add new file system operations (IRP/FastIO) Existing filters must be modified New IRP and FastIO operations were added to W2K Broke all existing filters TxF (new Longhorn feature) Multiple OS version support Filter must be developed to “least common denominator” API set © 2004 Microsoft Corporation. Kernel stack overflow Call-through model Filters generate recursive IO Inefficiencies due to redundant work in filters Each filter does its own name lookup, normalization, and name caching Implement their own context support Don’t always get it correct © 2004 Microsoft Corporation. All rights reserved.ģ Problems with today’s Filter Model (cont) ![]() Poor control over filter load order Non-deterministic Increases test matrix Causes interop problems No unload support Requires reboot Must process all operations ~5000 lines of code to start © 2004 Microsoft Corporation. ![]()
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