Maybe fsck should refuse to read or modify the journal if it is in use?
Also we need a way to be able to fsck a filesystem if the journal is no
longer available, or alternativly a way to remove a journal from a
filesystem if the journal is not available. (bug #559301
<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=559301> - tune2fs -f
-O ^has_journal does nothing if the journal device can't be found).
Maybe the easiest/safest would be:
1. fsck refuses to work if the journal device is open
2. tune2fs -f -O ^has_journal modifies the filesystem but *not* the
journal device
3. tune2fs -O ^has_journal refuses to work if the journal is not
empty or the filesystem is active or the journal is open by someone.
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