On Mon, Apr 11, 2016 at 08:23:00PM -0500, Eric W. Biederman wrote:
> Perhaps I am reading the code wrong but as I read it that information is
> simply not available in get_super.
Correct. For a very good reason - the same superblock can bloody well end up
in many places; having it tied to _the_ mountpoint is just plain wrong.
You know how it would look done right?
a) mount --after support
b) devpts containing both /ptmx and /pts/1,...
c) mount --type devpts --after none /dev
That's it. And this would be way, way more useful that overlay-style unions;
it would *NOT* recurse into subdirectories. Just a search list done right...
Not an option, unfortunately, since it obviously breaks userland setups -
even if we go ahead and implement that kind of non-recursive unions. But
if we had a chance to design it from scratch, that would've been an interesting
option.
