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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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