HAMMER: you can mount_hammer a UFS that was a hammer fs before

[Matthew Dillon]

   Well, this is basically simply due to the fact that the volume headers
   are in different places and HAMMER and UFS's initial data layout winds
   up being non-conflicting.  But clearly it isn't going to stay that way
   for long.

   It's a fun exercise and we should probably adjust newfs for UFS and HAMMER
   to clean out a few extra megabytes at the beginning of the partition to
   ensure that any prior volume header is overwritten, but it isn't really
   a bug per-say.  The filesystem type in the partition editor is the more
   definitive information source.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>