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From: ebiederm@xmission.com (Eric W. Biederman)
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	containers@lists.linux-foundation.org,
	Dave Hansen <haveblue@us.ibm.com>,
	linux-kernel@vger.kernel.org, Andy Whitcroft <apw@canonical.com>,
	sukadev@linux.vnet.ibm.com,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Serge Hallyn <serge.hallyn@canonical.com>
Subject: [PATCH 0/4] devpts: fix devpts mount behavior
Date: Sat, 22 Sep 2012 20:47:45 -0700	[thread overview]
Message-ID: <87txup763i.fsf_-_@xmission.com> (raw)
In-Reply-To: <20120128195103.GA11299@sergelap> (Serge Hallyn's message of "Sat, 28 Jan 2012 13:51:03 -0600")


This is the restart of an old conversation that started out with Serge
noting that there are problems taking advantage of the devpts newinstance
mount option.  As the conversation progressed it was suggested that the
devpts newinstance mount option should just be removed if possible.
Then the conversation floundered upon what to do about /dev/ptmx.
Making /dev/ptmx a symlink sounds simple, but in practice no one could
actually figure out how to make it happen.

I was playing with this recently and it is not at all hard or
complicated to have opens of ptmx redirect themselves to pts/ptmx.

So I propose we solve this issue by adding a little magic to /dev/ptmx
and making the devpts newinstance mount option historical.

I my limited testing the code just works.

I assume that since devpts is essentially serial this should go through
Greg's tree?

Eric


  parent reply	other threads:[~2012-09-23  3:47 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-01-24  0:05 [RFC] fix devpts mount behavior Serge Hallyn
2012-01-24  0:13 ` Linus Torvalds
2012-01-24  0:25   ` Serge Hallyn
2012-01-24  0:41     ` Linus Torvalds
2012-01-24  1:07       ` Al Viro
2012-01-24 18:21         ` Serge E. Hallyn
2012-01-24 20:16           ` Sukadev Bhattiprolu
2012-01-24 20:53             ` Serge E. Hallyn
2012-01-24 20:24         ` Eric W. Biederman
2012-01-24 22:02           ` Serge E. Hallyn
2012-01-24 22:54             ` Kay Sievers
2012-01-24 23:16               ` Serge Hallyn
2012-01-24 23:25                 ` Sukadev Bhattiprolu
2012-01-24 23:29                   ` Serge E. Hallyn
2012-01-24 23:27                 ` Kay Sievers
2012-01-28 19:51                   ` Serge Hallyn
2012-01-28 20:52                     ` Eric W. Biederman
2012-01-28 21:32                       ` Kay Sievers
2012-09-23  3:47                     ` Eric W. Biederman [this message]
2012-09-23  3:48                       ` [PATCH 1/4] devpts: Remove CONFIG_DEVPTS_MULTIPLE_INSTANCES Eric W. Biederman
2012-09-23  3:49                       ` [PATCH 2/4] devpts: Set the default permissions of /dev/pts/ptmx and /dev/ptmx to 0666 Eric W. Biederman
2012-09-23  3:50                       ` [PATCH 3/4] devpts: Make the newinstance option historical Eric W. Biederman
2012-09-23  4:19                         ` Al Viro
2012-09-23  4:46                           ` Al Viro
2012-09-23  5:59                           ` Eric W. Biederman
2012-09-23  6:30                             ` Al Viro
2012-09-23  6:34                               ` Al Viro
2012-09-23  7:00                                 ` Eric W. Biederman
2012-09-23  3:51                       ` [PATCH 4/4] devpts: Update the documentation Eric W. Biederman
2012-09-23 16:48                       ` [PATCH 0/4] devpts: fix devpts mount behavior H. Peter Anvin
2012-09-23 17:42                         ` Eric W. Biederman
2012-09-23 17:44                           ` H. Peter Anvin
2012-01-24 23:35             ` [RFC] " Eric W. Biederman
2012-01-24 20:55       ` Sukadev Bhattiprolu
2012-01-24 21:19         ` Nick Bowler
2012-01-24  0:26   ` Al Viro

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