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SubjectRe: [RFD w/info-PATCH] device arguments from lookup, partion code
On Mon, May 21, 2001 at 05:51:08PM -0400, Alexander Viro wrote:
> Sure. But we have to do two syscalls only if ioctl has both in- and out-
> arguments that way. Moreover, we are talking about non-trivial in- arguments.
> How many of these are in hotspots?

ioctl has actually 4 semantics:

command only
command + read
command + write
command + rw-transaction

Separating these would be a first step. And yes, I consider each
of them useful.

command only: reset drive
command + rw-transaction: "dear device please mangle this data"
(crypto processors come to mind...)

The other two are obviously needed and already accepted by all of

Hotspots: crypto hardware or generally DSPs.


Ingo Oeser
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