On Sun, Feb 17, 2019 at 12:40:09PM -0800, Andy Lutomirski wrote:

So I'm highly in favor of this patch.  If XFS wants to disallow
writing the birth time, fine, but I think that behavior should be
overridable.

Please, no.  We need to have consistent behaviour between at least
Linux local filesystems.  Not "Chris thinks this is a good idea,
while Dave and Ted think its a bad idea, so btrfs supports it and
XFS and ext4 disallow it".