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: 34+ 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
[not found] ` <20080412172933.GA19295-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-04-12 17:39 ` [PATCH 0/4] Helper patches for PTY namespaces Subrata Modak
[not found] ` <bb33bcf20804121039u409ae37q2dead849ca24dfa-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-04-12 18:05 ` sukadev-r/Jw6+rmf7HQT0dZR+AlfA
[not found] ` <20080412180533.GE19449-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2008-04-14 11:20 ` [LTP] " Subrata Modak
[not found] ` <1208172006.5762.21.camel-NRFfyExJdYpgXGGE5LP+UZlqa2bBAFbm0E9HWUfgJXw@public.gmane.org>
2008-04-14 12:31 ` Veerendra Chandrappa
[not found] ` <OF766ECBB8.8B7DAFCE-ON6525742B.00437346-6525742B.0043FD8A-xthvdsQ13ZrQT0dZR+AlfA@public.gmane.org>
2008-04-14 12:31 ` Subrata Modak
[not found] ` <1208176260.5762.36.camel-NRFfyExJdYpgXGGE5LP+UZlqa2bBAFbm0E9HWUfgJXw@public.gmane.org>
2008-04-22 7:11 ` Subrata Modak
[not found] ` <1208848319.4847.16.camel-NRFfyExJdYpgXGGE5LP+UZlqa2bBAFbm0E9HWUfgJXw@public.gmane.org>
2008-04-22 12:25 ` Serge E. Hallyn
[not found] ` <20080422122530.GB8331-6s5zFf/epYLPQpwDFJZrxKsjOiXwFzmk@public.gmane.org>
2008-04-22 15:08 ` [LTP] " Subrata Modak
2008-04-23 18:01 ` H. Peter Anvin
2008-04-12 18:09 ` 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
[not found] ` <1208027757.28187.25.camel-xJGG6ySDJhrj0SQisxZUdA@public.gmane.org>
2008-04-12 19:24 ` H. Peter Anvin
[not found] ` <48010C70.2030902-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
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
[not found] ` <1208027215.28187.17.camel-xJGG6ySDJhrj0SQisxZUdA@public.gmane.org>
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
[not found] ` <f73f7ab80808020006i7f0ac456ve9b9f73568c11294-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-08-02 15:33 ` H. Peter Anvin
2008-08-02 8:54 ` Bastian Blank [this message]
2008-08-03 5:08 ` sukadev
[not found] ` <20080803050800.GA4322-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20080802085443.GA7817@wavehammer.waldi.eu.org \
--to=bastian@waldi.eu.org \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=containers@lists.osdl.org \
--cc=ebiederm@xmission.com \
--cc=greg@kroah.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=xemul@openvz.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox