https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251363

--- Comment #7 from Gunther Schadow <r...@gusw.net> ---
Erratum: I said "I can evict from the cache by writing to the unionfs" -- I
meant by removing files from that /cache file system. I wasn't clear that in
order to mount a unionfs, you must already have the upper layer file system
mounted somewhere. And then you can access just the upper layer, where we can
clear the cache. So I do not need that UNIONFS_WHITE_NEVER option at all.

What might be cool was some kind of hook to register if the unionfs_copyfile
errors with no space left on device, we could call that evictor hook, which
then would delete from the upper layer by oldest atime.

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