Re: [PATCH 01/13] devpts: Teach /dev/ptmx to find the associated devpts via path lookup

[Al Viro]

On Mon, Apr 11, 2016 at 07:48:28AM -0700, H. Peter Anvin wrote:
 
> Here is an entire different approach, I don't know if it is sane or not: when *mounting* the devpts filesystem, it could automagically create the bins mount for ptmx in the parent of its mount point.  Presumably the would be a mount option to disable that behavior.
> 
> Does anyone see an obvious problem with that?

Yes.  ->mount() doesn't (and fucking *shouldn't*) know anything about the
mountpoint to be.  Not to mention that the same superblock can easily end
up being visible in many places, etc.  This is insane.