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Slava Imameev says that it is totally ok for FS to convert cached io to non-cached. In this case filter won’t see this data written to disk with paging io.
It raises some concerns.
1) for shadow copy filter. If I am not writing an isolation filter, what is my best course of action to be as correct as possible ? Copy all writes (including cached ones) to my shadow copy ?
2) for encrypting filter. Let’s say io manager calls fast io write routine for highest filter. My encrypting filter skips this write since data in cache should be plaintext. But fs decides to write this data directly to volume. Non-encrypted data stored on volume. Without writing isolation filter, can this problem be solved correctly ?
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