[RFC][PATCH 7/8]: Auto-create ptmx node when mounting devpts

sukadev at us.ibm.com sukadev at us.ibm.com
Thu Aug 21 10:23:42 PDT 2008

H. Peter Anvin [hpa at zytor.com] wrote:
> Alan Cox wrote:
>>> auto-created, than supporting mknod(2) inside the devpts filesystem. It's 
>>> not a matter of "changing the user space"; it's a matter of what makes 
>>> most sense inside the kernel.
>> Having an extra node with different permissions suddenely appear without
>> warning isn't I think good behaviour.
> Hm.  Given that the single-instance mode is the backwards compatibility 
> mode (and it's accessible from outside the filesystem), it probably makes 
> sense to suppress creating this device node when *not* applying the "newns" 
> option, or whatever we want to call it.

I had the new ptmx node only in 'multi-mount' mode initially. But if users
want the multi-mount semantics, /dev/ptmx must be a symlink. If its a symlink,
we break in the single-mount case (which does not have the ptmx node and
we don't support mknod in pts).

>> I'm open to being convinced and the
>> other problems with that code are more pressing.

Yes, I will look at the latest in linux-next and the ->driver_data

But just to confirm, we do want try and keep single-mount semantics.

> Agreed.
> 	-hpa

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