RFR: 8341282: (fs) Move creation time fallback logic to Java layer (Linux)

[Brian Burkhalter]

On Tue, 1 Oct 2024 08:52:46 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

>> Move the decision as to whether `BasicFileAttributes.creationTime()` falls back to the modified time from the native layer to the Java layer.
>
> src/java.base/unix/classes/sun/nio/fs/UnixFileAttributes.java line 61:
> 
>> 59:     private long    st_birthtime_sec;
>> 60:     private long    st_birthtime_nsec;
>> 61:     private boolean birthtime_invalid;
> 
> Suggestion:
> 
>     private boolean birthtime_filled_in;
> 
> 
> Perhaps we should add a comment that this is Linux-only and will only be true for Linux filesystems that support birth time.

Maybe `birthtime_valid` or `birthtime_available`?

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PR Review Comment: https://git.openjdk.org/jdk/pull/21274#discussion_r1783146283