K 10
svn:author
V 6
emaste
K 8
svn:date
V 27
2017-11-15T18:40:40.886327Z
K 7
svn:log
V 384
newfs: warn if newer than kernel

Creating a UFS filesystem with a newfs newer than the running kernel,
and then mounting that filesystem, can lead to interesting failures.

Add a safety belt to explicitly warn when newfs is newer than the
running kernel.

Reviewed by:	gjb, jhb, mckusick
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D12765

END