Re: copy offload support in Linux - new system call needed?

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On Wed, Dec 14, 2011 at 02:22:07PM -0500, Ric Wheeler wrote:

> We had an active thread a couple of years back that came out of the
> reflink work and, at the time, there seemed to be moderately
> positive support for adding a new system call that would fit this
> use case (Joel Becker's copyfile()).
> 
> Can we resurrect this effort? Is copyfile() still a good way to go,
> or should we look at other hooks?

copyfile(2) is probably a good way to go, provided that we do _not_
go baroque as it had happened the last time syscall had been discussed.

IOW, to hell with progress reports, etc. - just a fastpath kind of
thing, in the same kind of relationship to cp(1) as rename(2) is to mv(1).
If it works - fine, if not - caller has to be ready to deal with handling
cross-device case anyway.
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