Re: f_ops flag to speed up compatible ioctls in linux kernel

[Chris Wright]

* Roland Dreier (roland@xxxxxxxxxxx) 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).

thanks,
-chris
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