RFR: 8292562: (fc) Use copy_file_range in FileChannel::transferTo on Linux [v4]

[Alan Bateman]

On Mon, 22 Aug 2022 18:20:40 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Add `copy_file_range(2)` to the native Linux implementation of `FileChannel::transferTo`.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8292562: Add test of transferTo while target is appending

Marked as reviewed by alanb (Reviewer).

Aside from the check if copy_file_range is supported then I think the change to the transferTo implementation in c3c36f1d looks good. At some point I would expect we will pass the append flag from the java code. Have you looked at transferFrom for the append case? I suspect it is masked by the check for EBADF and now may be the time to re-examine that (okay to be a separate PR but hopefully you see the issue there).

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PR: https://git.openjdk.org/jdk/pull/9925