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    SubjectRe: f_ops flag to speed up compatible ioctls in linux kernel
    * Roland Dreier ( wrote:
    > - read/write on char device:
    > OK, except requires some mechanism (tag #) for matching requests
    > and responses. Nowhere clean to put 32/64 compatibility code.

    You forgot a driver specific filesystem which exposes requests in a file
    per request type style. Also, there's a simple_transaction type of file
    which can allow you send/recv data and should eliminate the need for
    tagging. Example, look at nfsd fs (fs/nfsd/nfsctl.c).

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