Re: silent semantic changes with reiser4

Bernd Petrovitsch
2004-08-27T09:08:43Z

On Fri, 2004-08-27 at 10:49 +0200, Christoph Hellwig wrote:

> On Fri, Aug 27, 2004 at 09:41:07AM +0200, Bernd Petrovitsch wrote:
> > > > UNIX doesn't have a copy systemcall, applications copy the data
> > > > manually.
> > >
> > > Oh, this is very unfortunate and should be a bigger issue to fix.
> >
> > Then you have to rewrite POSIX und SuSv3.
>
> They don't say 'you must now have a copy syscall'. Having one that's
> actually used by system tools would be a great optimization for many
> network or distributed filesystems.

ACK. But actually spam apparently assumes that the kernel - userspace
interface is at the wrong abstraction level. And this is conceptually
bound IMHO to POSIX.
And it does not solve the problem, that the read() and write() sys-calls
will not vanish. Even if a copy() sys-call exists.

Bernd
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