I would suggest teaching parted_server (in partman-base) about a new
command to tell whether the fs on a given partition is dirty, and making
use of that in partman-basicfilesystems where it decides whether to
automount things.

As far as os-prober goes, there was discussion about this recently
upstream in http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=417407;
there was a suggestion here to "protect" block devices by using
'blockdev --setro', which ought to convince the kernel not to do
anything at all to the contents of the block device for the duration. I
think this ought to require resurrecting the port we used to have of
blockdev to busybox, rather than creating a new blockdev-udeb.

** Bug watch added: Debian Bug tracker #417407
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=417407

** Also affects: os-prober (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=417407
   Importance: Unknown
       Status: Unknown

-- 
Replaying journals of other OS's filesystems, by mounting them, is unsafe
https://bugs.launchpad.net/bugs/41624
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