Leaked source code of windows server 2003
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This is a test filter that is based on Sfilter.
It was written to test the IO verifier check to make sure that a file doesn't try to reissue a create with a file object that has already been opened and closed bythe base file system.
This filter attaches two device objects to each volume stack, Upper and Lower.
When a CREATE is seen on a file with the name '\test\failure.txt' with no share access, * Upper and lower will pass it through to the base file system, * Once the file system has opened the file, Lower will cancel the create by calling IoCancelFileOpen and returning STATUS_UNSUCCESSFUL. * When Upper gets STATUS_UNSUCCESSFUL, it will change the ShareAccess for this create to FILE_SHARE_READ then reissue the CREATE irp.
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