From: "H. Peter Anvin" <hpa@zytor.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: sukadev@us.ibm.com, Andrew Morton <akpm@osdl.org>,
serue@us.ibm.com, matthltc@us.ibm.com,
"Eric W. Biederman" <ebiederm@xmission.com>,
Pavel Emelyanov <xemul@openvz.org>,
Containers <containers@lists.osdl.org>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Multiple instances of devpts
Date: Sat, 12 Apr 2008 11:54:59 -0700 [thread overview]
Message-ID: <48010583.3020403@zytor.com> (raw)
In-Reply-To: <20080412183514.GO9785@ZenIV.linux.org.uk>
Al Viro wrote:
>
> *boggle*
>
> Care to explain how that "namespace" is different from devpts instance?
> IOW, why the devil do you guys ignore Occam's Razor?
>
> Frankly, this nonsense has gone far enough; I can buy the need to compensate
> for shitty APIs (sockets, non-fs-based-IPC, etc.), but devpts *is* *a*
> *fucking* *filesystem*. Already. And as such it's already present in
> normal, real, we-really-shouldn't-have-any-other-if-not-for-ancient-stupidity
> namespace.
>
> Why not simply allow independent instances of devpts and be done with that?
In particular:
/dev/ptmx can be a symlink ptmx -> pts/ptmx, and we add a ptmx instance
inside the devpts filesystem. Each devpts filesystem is responsible for
its own pool of ptys, with own numbering, etc.
This does mean that entries in /dev/pts are more than just plain device
nodes, which they are now (you can cp -a a device node from /dev/pts
into another filesystem and it will still "just work"), but I doubt this
actually matters to anyone. If anyone cares, now I guess would be a
good time to speak up.
-hpa
next prev parent reply other threads:[~2008-04-12 18:54 UTC|newest]
Thread overview: 41+ 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 18:09 ` H. Peter Anvin
2008-04-12 18:35 ` Al Viro
2008-04-12 18:54 ` H. Peter Anvin [this message]
2008-04-12 19:15 ` Multiple instances of devpts Eric W. Biederman
[not found] ` <1208027757.28187.25.camel-xJGG6ySDJhrj0SQisxZUdA@public.gmane.org>
2008-04-12 19:24 ` H. Peter Anvin
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 19:30 ` 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 18:12 ` 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 15:33 ` H. Peter Anvin
2008-08-02 8:54 ` Bastian Blank
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 11:31 ` H. Peter Anvin
2008-08-03 12:04 ` Alan Cox
2008-08-03 12:04 ` Alan Cox
2008-08-03 17:46 ` sukadev
2008-08-03 17:54 ` Alan Cox
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