RFR: 8264744: (fs) Use file cloning in Linux and macOS versions of FileChannel transfer and Files copy methods [v2]

[Brian Burkhalter]

On Fri, 15 Jul 2022 11:28:38 GMT, Markus KARG <duke at openjdk.org> wrote:

>> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8264744: Refactor into provider+dispatcher to reduce amount of JNI code
>
> test/jdk/java/nio/file/Files/CopyAndMove.java line 52:
> 
>> 50:     // for testing cloning / reflink on Linux
>> 51:     private static final Set<String> COW_TYPES =
>> 52:         Set.of("bcachefs", "btrfs", "ocfs2", "xfs");
> 
> Shouldn't we also test on non-CoW-FS to be sure that the recent changes do not have a negative impact *there*?

Most testing is done on ext4 so this is covered.

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