[RFC][PATCH 0/6] Enable multiple mounts of devpts

Kyle Moffett kyle at moffetthome.net
Mon Aug 4 21:57:24 PDT 2008


On Mon, Aug 4, 2008 at 10:07 PM, H. Peter Anvin <hpa at zytor.com> wrote:
> You're right, I think we can do this and still retain most of the
> advantages, at least for a transition period.
>
> The idea would be that you'd have a mount option, that if you do not specify
> it, you get a bind to the in-kernel mount; otherwise you get a new instance.
>  ptmx, if not invoked from inside a devpts filesystem, would default to the
> kernel-mounted instance.
>
> Unfortunately I believe that means parsing the command options in
> getpts_get_sb() to know if we do have the "multi" option, but that isn't
> really all that difficult; it just means breaking the parser out as a
> separate subroutine.

There definitely needs to be a mount option (and possibly a config
option to forcibly enable the mount option).  I personally have 5 or 6
different custom scripts that depend on being able to unmount and
remount devpts without losing access to the TTYs therein.  Eventually
I will need to port those over to use "mount --move", but it would be
bad to have a random kernel upgrade just break my imaging/cloning
system.

Cheers,
Kyle Moffett


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