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does cache manager flush cache before handling noncache io?

HaiboHaibo Member Posts: 178

APIs like ZwCreateFile and FltWriteFile have flags to perform noncached IO, does system flush dirty data in cache before handling noncachedio to keep cache consistency? Or it is possbile that noncached read can get stale data?

Comments

  • rod_widdowsonrod_widdowson Member - All Emails Posts: 1,173

    To be accurate, the file system instructs the cache manager to flush (read path) or flush and purge (write path). Check out the FAT sources.

    Absent misbehaving filters, the only way data- staleness can occur is via careful abuse of sections ...

  • HaiboHaibo Member Posts: 178

    good, thanks rod

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