[8u] RFR(M): 8168628/8171452: (fc) SIGBUS when extending file size to map it

[Alan Bateman]

On 02/02/2018 14:16, David Buck wrote:
> Hi!
>
> I would really appreciate a review of my backport of jdk8168628 to JDK 
> 8. As jdk8168628 introduced a regression (jdk8171452), I have also 
> included the small fix for that in my backport as it makes sense to 
> push them both at the same time.
>
> bug report (original bug):
> [ (fc) SIGBUS when extending file size to map it ]
> https://bugs.openjdk.java.net/browse/JDK-8168628
>
> JDK 9 code review thread:
> http://mail.openjdk.java.net/pipermail/nio-dev/2016-December/003997.html
>
> JDK 9 changset:
> http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/c0af0f58d538
>
> bug report (minor regression fix added to above fix):
> [ (ch) linux io_util_md: Operation not supported exception after 
> 8168628 ]
> https://bugs.openjdk.java.net/browse/JDK-8171452
>
> JDK 9 code review thread (December 2016 and January 2017):
> http://mail.openjdk.java.net/pipermail/nio-dev/2016-December/004031.html
> http://mail.openjdk.java.net/pipermail/nio-dev/2017-January/004048.html
>
> JDK 9 changset:
> http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/8b55846dd69d
>
> webrev combining above two fixes for review:
> http://cr.openjdk.java.net/~dbuck/8168628_jdk8_ver00/
>
I've looked through the combined changes and they look okay to me.

-Alan.