[PATCH 5/5] nvmet: implement copy support for bdev backed target

[Christoph Hellwig]

On Fri, May 23, 2025 at 08:00:56AM -0600, Keith Busch wrote:
> On Fri, May 23, 2025 at 06:18:31AM -0700, Christoph Hellwig wrote:
> > I need this additional bit so that the host code actually see the
> > copy support:
> 
> Thanks! I think it just needs to be constrained to bdev backed targets
> since I don't have file support for copy offload here. And less
> important, but for spec compliance, I need to update the Command Effects
> Log too.

A file backend should be pretty trivial using vfs_copy_file_range.
On reflink-enabled file systems it might end up beeing to fast to
be useful, though :)