RFR: 8264744: (fs) Use file cloning in Linux and macOS versions of FileChannel transfer and Files copy methods [v5]

[Alan Bateman]

On Wed, 3 Aug 2022 15:22:01 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Add file cloning to `java.nio.channels.FileChannel::transferTo` and `java.nio.file.Files.copy(Path,Path)`.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8264744: Fix typo desintation -> destination

I skimmed the latest patch and I think the main thing that still needs to be worked out is how to integtrate "clonefile". Right now the current prototype adds sun.nio.fs.CloneFile but that doesn't fit into the provider architecture. I think we are getting close to the point with these changes where UnixNativeDispatcher will need to be changed to define instance methods rather than static methods. I'll add comments soon with suggestions for how this could be integrated.

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PR: https://git.openjdk.org/jdk/pull/9486