Re: Add a dead mount

[Taylor R Campbell <campbell+netbsd-tech-kern%mumble.net@localhost>]

   Date: Sun, 23 Feb 2014 13:57:52 +0100
   From: "J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>

   Currently dead vnodes still reside on the vnodelist of the file system
   they have been removed from.  To me it looks much better to create
   a "dead mount" that takes dead vnodes until they get freed.

   Diff available at http://www.netbsd.org/~hannken/dead-mount.diff

   Comments or objections anyone?

Sounds plausible to me.  vclean doesn't seem like quite the right
place to be handling dead_mount->mnt_refcnt, but I don't see a better
place to do it.