Patch to add support for advertising FULLSYNC to Mac OSX Clients

[Ralph Böhme]

On Tue, Feb 21, 2017 at 08:55:15AM -0800, Jeremy Allison wrote:
> On Sun, Feb 19, 2017 at 11:41:13AM -0800, Christoph Hellwig wrote:
> > On Sun, Feb 19, 2017 at 08:44:47PM +0200, Alexander Bokovoy wrote:
> > > On su, 19 helmi 2017, Christoph Hellwig wrote:
> > > > Coming in late here, but I would suggest that the Samba team
> > > > reconsiders implementing the flush commands properly, as in not
> > > > being a no-op.  Except for the Apple world with it's odd FULLSYNC
> > > > fcntl fsync/fdatasync is _the_ primitive to guarantee data integrity,
> > > > and a major file sever that simply ignores it is a major disaster for
> > > > the full storage stack.
> > > Samba already has vfs_commit module which implements fsync/fdatasync
> > > use. It can be stacked with other modules to achieve what you just
> > > described.
> > 
> > I'm worried about doing the right thing out of the box and by default.
> 
> So really all you're asking for is 'strict sync = yes'
> by default. That's doable.

maybe at least for SMB2.

Cheerio!
-slow