[8u-dev] RFR & RFA: 8202261 - (fc) FileChannel.map and RandomAccessFile.setLength should not preallocate space

[Rob McKenna]

Hi folks,

Looking for review / approval for:

8202261: (fc) FileChannel.map and RandomAccessFile.setLength should not preallocate space
https://bugs.openjdk.java.net/browse/JDK-8202261

This webrev differs very slightly from the 12 changeset:

http://cr.openjdk.java.net/~robm/8202261/webrev.01/

The (minor) differences are:

1) edits to the mapfiles
2) No setDirectIO bracket alteration in windows/classes/sun/nio/ch/FileDispatcherImpl.java

JPRT builds & passes regression testing.

    -Rob