[PATCH v20 00/12] Implement copy offload support

[Christoph Hellwig]

On Tue, Jun 04, 2024 at 04:39:25PM +0900, Damien Le Moal wrote:
> > But I wasn't aware that this approach is limited to copying within a 
> > single block devices; that would be quite pointless indeed.
> 
> Not pointless for any FS doing CoW+Rebalancing of block groups (e.g. btrfs) and
> of course GC for FSes on zoned devices. But for this use case, an API allowing
> multiple sources and one destination would be better.

Yes.