RFR: 8310902: (fc) FileChannel.transferXXX async close and interrupt issues [v3]

[Alan Bateman]

On Wed, 28 Jun 2023 18:07:58 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Alan Bateman has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains seven additional commits since the last revision:
>> 
>>  - Merge
>>  - Make transferFromDirect more consistent
>>  - Merge
>>  - More robustness
>>  - Update
>>  - Update
>>  - Initial commit
>
> src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java line 657:
> 
>> 655:                     long n = transferToFileDescriptor(position, count, target.fd);
>> 656:                     if (n == IOStatus.UNSUPPORTED_CASE) {
>> 657:                         transferToFileDirectNotSupported = true;
> 
> On Linux, `transferToFileDescriptor` will fail with `UNSUPPORTED_CASE` if the target is open for appending. I don't think that this should mean that all future fast transfers to a file should be suppressed.

I'll check it but all I've really done here is rename fileSupported to transferToFileDirectNotSupported and inverted the values.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14656#discussion_r1245610113