[PATCH V5] journal: add share extension support

[Yuya Nishihara]

On Mon, 11 Jul 2016 14:55:46 +0100, Martijn Pieters wrote:
> # HG changeset patch
> # User Martijn Pieters <mjpieters at fb.com>
> # Date 1468244741 -3600
> #      Mon Jul 11 14:45:41 2016 +0100
> # Node ID 01e61335681e8e9b10b754f54261327b0b008ebd
> # Parent  ccd47220f3d910ac2c682ec1c53e3a660b7b3e8f
> journal: add share extension support

Queued this one, thanks.