From: Bastian Blank <bastian@waldi.eu.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Greg KH <greg@kroah.com>,
linux-kernel@vger.kernel.org,
Containers <containers@lists.osdl.org>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Pavel Emelyanov <xemul@openvz.org>
Subject: Re: Per-instance devpts
Date: Sat, 2 Aug 2008 10:54:43 +0200 [thread overview]
Message-ID: <20080802085443.GA7817@wavehammer.waldi.eu.org> (raw)
In-Reply-To: <48935205.3090807@zytor.com>
On Fri, Aug 01, 2008 at 11:12:21AM -0700, H. Peter Anvin wrote:
> 2. Permissions on /dev/ptmx would not be persistent, and would have to
> be set via devpts mount options (unless they're 0666 root.tty, which
> would presumably be the default.)
On Debian based systems /dev/ptmx is 0666 root.root. But the gid of tty
is already supplied for devpts.
> I worry #1 would have substantial user-space impact, but I don't see a
> way around it, since there would be no obvious way to associate
> /dev/ptmx with a filesystem.
Hmm. Several possibilities:
- Change the filesysteme name and the old name remains usable with
/dev/ptmx.
Problem: You could mount the filesystem with the old name within a
container.
- Make the first mounted one special.
Problem: Will not survive a umount/mount cycle. But this would be not
the case anyway.
But you are sure, none of them is a pretty solution.
Bastian
--
I'm a soldier, not a diplomat. I can only tell the truth.
-- Kirk, "Errand of Mercy", stardate 3198.9
next prev parent reply other threads:[~2008-08-02 8:54 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-12 17:29 [PATCH 0/4] Helper patches for PTY namespaces sukadev
2008-04-12 17:32 ` [PATCH 1/4]: Propagate error code from devpts_pty_new sukadev
2008-04-12 17:32 ` [PATCH 2/4]: Factor out PTY index allocation sukadev
2008-04-12 17:33 ` [PATCH 3/4]: Move devpts globals into init_pts_ns sukadev
2008-04-12 17:34 ` [PATCH 4/4]: Enable multiple mounts of /dev/pts sukadev
2008-04-12 18:09 ` [PATCH 0/4] Helper patches for PTY namespaces H. Peter Anvin
2008-04-12 18:35 ` Al Viro
2008-04-12 18:54 ` Multiple instances of devpts H. Peter Anvin
2008-04-12 19:15 ` Eric W. Biederman
2008-04-12 19:24 ` H. Peter Anvin
2008-04-12 19:30 ` H. Peter Anvin
2008-04-12 19:06 ` [PATCH 0/4] Helper patches for PTY namespaces Eric W. Biederman
2008-04-13 0:59 ` Serge E. Hallyn
2008-08-01 18:12 ` Per-instance devpts H. Peter Anvin
2008-08-01 19:23 ` Dave Hansen
2008-08-01 19:35 ` Al Viro
2008-08-01 19:37 ` H. Peter Anvin
[not found] ` <f73f7ab80808020004j15b0d0e5x5fa911242641b34d@mail.gmail.com>
2008-08-02 7:06 ` Kyle Moffett
2008-08-02 15:33 ` H. Peter Anvin
2008-08-02 8:54 ` Bastian Blank [this message]
2008-08-03 5:08 ` sukadev
2008-08-03 11:31 ` H. Peter Anvin
2008-08-03 12:04 ` Alan Cox
2008-08-03 17:46 ` sukadev
2008-08-03 17:54 ` Alan Cox
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