Patch to add support for advertising FULLSYNC to Mac OSX Clients

[Jeremy Allison]

On Sun, Feb 19, 2017 at 09:23:54AM -0800, 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.

We already implement the flush commands properly.

man smb.conf

/strict sync