linux-kernel - Re: Per-instance devpts

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Message-ID: <48947E67.9060005@zytor.com>
Date:	Sat, 02 Aug 2008 08:33:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Kyle Moffett <kyle@...fetthome.net>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>, sukadev@...ibm.com,
	Andrew Morton <akpm@...l.org>, serue@...ibm.com,
	matthltc@...ibm.com, Pavel Emelyanov <xemul@...nvz.org>,
	Containers <containers@...ts.osdl.org>,
	linux-kernel@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg KH <greg@...ah.com>
Subject: Re: Per-instance devpts

Kyle Moffett wrote:
> 
> Here's my suggestion:
> 
> By default, without any mount options, use the current "legacy"
> behavior.  The devpts filesystem would point to a "global" instance on
> the whole box, controlled by the traditional /dev/ptmx device node.
> There would *NOT* be a /dev/pts/ptmx node.
> 
> If the devpts filesystem is mounted with a special option ("permount"?
> "noglobal"?), then it will create a new devpts instance associated
> with the filesystem.  A devpts mounted that way *WILL* have a magic
> /dev/pts/ptmx node.
> 
> If the kernel is built with CONFIG_DEVPTS_FORCE_PERMOUNT then the
> traditional /dev/ptmx device node will be neutered (IE: always return
> -ENODEV) and the "permount" option will be forced for all devpts
> mounts.  This will also remove the static global devpts instance.
> 

Hm.  This might work if we can get the mount behaviour to work right. 
I'll think about it.  It definitely seems like a reasonable way to get 
from A to B.

	-hpa
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