[PATCH] xfs: introduce "metasync" api to sync metadata to fsblock

[Christoph Hellwig]

On Tue, Oct 15, 2019 at 09:56:20AM +0800, Pingfan Liu wrote:
> Agree. For the consistency of the whole fs, we need grub to be aware of
> log. While this patch just assumes that files accessed by grub are
> known, and the consistency is forced only on these files.
> > get by freezing and unfreezing the file system using the FIFREEZE and
> > FITHAW ioctls.  And if my memory is serving me correctly Dave has been
> freeze will block any further modification to the fs. That is different
> from my patch, which does not have such limitation.

So you freeze and immediately unfreeze.