![]() The old mapping path is the path which SimRep looks for on incoming opens. The mapping is made up of a "New Mapping Path" and an "Old Mapping Path". SimRep decides to reparse according to a mapping. This means we reparse without actually going to the file system. When SimRep detects a create for a path that it is redirecting, SimRep replaces the file name in the file object and completes the open with STATUS_REPARSE. Instead it "fakes" encountering a reparse point before the create reaches the filesystem. SimRep does not demonstrate how to handle the case where the file system hits a reparse-point on the file. If the tag is unknown to IO manager then the create is failed with STATUS_IO_REPARSE_TAG_NOT_HANDLED. If no file system filter claims the tag, IO Manager will attempt to interpret the tag based on tags known to and serviced by IO Manager. ![]() As the create travels up file system filter stack in post-create path, each minifilter has the opportunity to interpret the reparse point if they own the tag. Minifilters see the post-operation callback for this create. Normally, if the file-system sees an open for a file with a reparse-point on it, the filesystem fills out the tag buffer and returns STATUS_REPARSE. ![]() It uses only APIs and DDIs that are included in OneCoreUAP. This sample builds a Universal Windows Driver. ![]() SimRep is a sample filter that demonstrates how a file system filter can simulate file-system like reparse-point behavior to redirect a file open to an alternate path.
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June 2023
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