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From: Richard Weinberger <richard@nod.at>
To: Ram Pai <linuxram@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Christoph Hellwig <hch@infradead.org>,
	Paul McKenney <paulmck@linux.vnet.ibm.com>,
	Jeff Mahoney <jeffm@suse.com>,
	sahne@0x90.at,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: MNT_DETACH and mount namespace issue
Date: Tue, 05 Aug 2014 00:16:10 +0200	[thread overview]
Message-ID: <53E0062A.8030204@nod.at> (raw)
In-Reply-To: <20140804221051.GH24719@ram.oc3035372033.ibm.com>

Am 05.08.2014 00:10, schrieb Ram Pai:
> On Mon, Aug 04, 2014 at 11:19:35PM +0200, Richard Weinberger wrote:
>> Am 04.08.2014 18:46, schrieb Eric W. Biederman:
>>> Richard Weinberger <richard.weinberger@gmail.com> writes:
>>
>> /proc is propagating into another mount namespaces that does not care.
>> This happens because systemd creates for several services a mount namespace and sets
>> the root tree to MS_SHARED.
> 
> if propagations are not needed, than set the root of the new mount
> namespace to MS_PRIVATE first and then set it to MS_SHARED.
> 
> MS_PRIVATE will delink the propagations, and MS_SHARED later will enable
> the new mounts to propagate to whoever wants them.

AFAICT this would break systemd's PrivateTmp feature. :(
They want propagation. Such that a systemd service has a private /tmp but sees freshly
mounted filesystems after setting up the namespace.

Thanks,
//richard

  reply	other threads:[~2014-08-04 22:16 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-30 13:59 [PATCH] vfs: Fix RCU usage in __propagate_umount() Richard Weinberger
2014-07-30 14:20 ` Richard Weinberger
2014-07-30 18:39 ` Paul E. McKenney
2014-07-30 18:39   ` Paul E. McKenney
2014-07-30 20:46 ` MNT_DETACH and mount namespace issue (was: Re: [PATCH] vfs: Fix RCU usage in __propagate_umount()) Richard Weinberger
2014-07-31 22:17   ` MNT_DETACH and mount namespace issue Richard Weinberger
2014-08-01 15:44     ` Ram Pai
2014-08-01 19:20       ` Richard Weinberger
2014-08-01 19:20         ` Richard Weinberger
2014-08-01 22:09         ` Eric W. Biederman
2014-08-04  8:40           ` Richard Weinberger
2014-08-04 16:46             ` Eric W. Biederman
2014-08-04 21:19               ` Richard Weinberger
2014-08-04 22:10                 ` Ram Pai
2014-08-04 22:16                   ` Richard Weinberger [this message]
2014-08-04 22:59                 ` Eric W. Biederman

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