6.0-BETA3: ext2fs: if mounted at shutdown, fsck at next boot

[Matthias Andree]

See Subject - this bug has already haunted FreeBSD 5 and still persists
in FreeBSD 6.0: shutting down FreeBSD 5 or 6 with a mounted ext2fs file
system prevents proper synching of the super blocks (vnode count remains
nonzero, until kernel gives up), so all file systems that were mounted
are fsck'd at next reboot, UFS, UFS2, ext2fs, doesn't matter.

Someone please check the ext2fs locking.

-- 
Matthias Andree