u-codalist-z149_at_aetey.se writes:

>> It's also possible to add in some sort of container file interface to
>> FUSE, eventually, which is similar to what coda does, but gets it moved
>> to a different layer where hopefully more people/code will use it and
>> care.  Coda just has too few people...
>
> A "modified FUSE" is conceptually the same as a "Coda-specific kernel
> interface", unless you convince the world that the wannabe new feature
> is useful for "everyone" or at least for "many", besides Coda :(

Yes, but for any filesystem that has container files for local copies,
the passthrough is useful.  So it is far more broadly useful than coda.
It could be an optional extension, used if present, and put into a few
FUSE implementations.