Jonathon: looks interesting.  I will put my question to you again (are
you an fsck expert?)  Do you know whether it would at least in theory be
possible to run part of fsck on a live filesystem, and only to run the
rest at boot/shutdown time?  I am thinking of something like the
following: fsck runs in the background in read-only mode on the file
system, while the user is doing other work.  Due to the fact that the
filesystem is in use, certain errors will be flagged which are not in
fact errors.  Next time fsck runs on boot/shutdown, it only does a
limited check to see whether the errors which it picked up during its
live run are really errors or just false positives.

I could imagine that some (but not all) types of fsck errors could be
sensibly screened for in this way, but then again, I am not an expert,
and do think that someone might have implemented this if it were really
as simple as I picture it.

-- 
no visible indication that a long-running fsck is taking place in background
https://bugs.launchpad.net/bugs/38303
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