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Description of problem:
/etc/init.d/halt umounts all filesystems not matching
/(^#|proc|loopfs|autofs|^none|^\/dev\/root| \/ )/
and then it remount read-only filesystems matching /ext2/ (and ummounts
proc).  Thus when root filesystem is not ext2, it is neither unmounted
(which is ok) nor remounted read-only (which is bad).

How reproducible:
Always

Steps to Reproduce:
1. setup system to use reiserfs (for example) root filesystem
2. run poweroff / halt / reboot

	

Actual Results:  Root file system is left mounted read-write on shutdown,
journal log replay starts on next boot.

Expected Results:  Root file system is remounted read-only on shutdown.

Additional info:

I fixed it using the same sematics for what is excluded from unmounting and
what is then remounted read only.  Patch attached.