[8u40] Request for Approval: 8054029: (fc) FileChannel.size() returns 0 for block devices on Linux

[Ivan Gerasimov]

Hello!

Would you please approve the backport of this edge-case fix?
The fix applies cleanly modulo unshuffling.

Bug: https://bugs.openjdk.java.net/browse/JDK-8054029
Jdk9 Change: http://hg.openjdk.java.net/jdk9/dev/jdk/raw-rev/f8b718af3f3c
Review: 
http://mail.openjdk.java.net/pipermail/nio-dev/2014-September/002738.html

Sincerely yours,
Ivan