> Hi!
>
> > > Is there any known method of copying/compressing the loopback-mounted file-
> > > system that always guarantees consistency after a sync, without requiring the
> > > fs to be unmounted first?
> >
> > Try mounting the loop device synchronously (mount ... -o sync).
>
> That should not be needed. All data should be on disk by time umount
> succeeds. That's not currently the case, and that's a bug.
The message reads as though he wants the data to be on-disk without requiring
a umount.
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