RFR: 8292562: (fc) Use copy_file_range in FileChannel::transferTo on Linux [v5]

[Alan Bateman]

On Tue, 23 Aug 2022 17:54:17 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 append parameter; add transferFrom to test

src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java line 576:

> 574:                 long comp = Blocker.begin();
> 575:                 try {
> 576:                     boolean append = fdAccess.getAppend(targetFD);

Can you move this to before the do-while as it does not need to be in the loop or in the Blocker.begin/end.

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