RFR: 8264744: (fs) Use file cloning in Linux version of Files::copy method [v13]

[Alan Bateman]

On Tue, 6 Sep 2022 17:20:59 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: Remove search for CoW volumes; run same directory tests on test.dir if it has a different format

Marked as reviewed by alanb (Reviewer).

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