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

[Christoph Hellwig]

On Mon, Oct 14, 2019 at 03:09:48PM -0500, Eric Sandeen wrote:
> We're in agreement here.  ;)  I only worry about implementing things like this
> which sound like guarantees, but aren't, and end up encouraging bad behavior
> or promoting misconceptions.
> 
> More and more, I think we should reconsider Darrick's "bootfs" (ext2 by another
> name, but with extra-sync-iness) proposal...

Having a separate simple file system for the boot loader makes a lot of
sense.  Note that vfat of EFI is the best choice, but at least it is
something.  SysV Unix from the 90s actually had a special file system just
for that, and fs/bfs/ in Linux supports that.  So this isn't really a new
thing either.