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From: Seth Forshee <seth.forshee@canonical.com>
To: LXC development mailing-list <lxc-devel@lists.linuxcontainers.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jens Axboe <axboe@kernel.dk>,
	Serge Hallyn <serge.hallyn@canonical.com>,
	Arnd Bergmann <arnd@arndb.de>,
	linux-kernel@vger.kernel.org,
	James Bottomley <James.Bottomley@HansenPartnership.com>
Subject: Re: [lxc-devel] [RFC PATCH 00/11] Add support for devtmpfs in user namespaces
Date: Thu, 15 May 2014 13:12:06 -0500	[thread overview]
Message-ID: <20140515181206.GA1946@ubuntu-hedt> (raw)
In-Reply-To: <20140515174254.GM21073@ubuntumail>

On Thu, May 15, 2014 at 05:42:54PM +0000, Serge Hallyn wrote:
> > > Serge mentioned something to me about a loopdevfs (?) thing that someone
> > > else is working on.  That would seem to be a better solution in this
> > > particular case but I don't know much about it or where it's at.
> > 
> > Ok, let's see those patches then.
> 
> I think Seth has a git tree ready, but not sure which branch he'd want
> us to look at.

I think the most recent code I've got is the devloop branch of
http://kernel.ubuntu.com/git/sforshee/ubuntu-trusty.git, which is still
a bit messy but gets the idea across. I switched from that to the
devtmpfs approach though for several reasons: the psuedo-fs approach
required some (in my opinion) undesirable collateral changes, it would
require changes to userspace tools (though likely small), and it solves
the problem only for loop devices. Plus if you don't push namespace
awareness down to at least the generic block layer you still can't do
partitions or encrypted loop, and then there are still other problems
which need to be solved to get partition blkdevs inside the mount.

  reply	other threads:[~2014-05-15 18:12 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-14 21:34 [RFC PATCH 00/11] Add support for devtmpfs in user namespaces Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 01/11] driver core: Assign owning user namespace to devices Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 02/11] driver core: Add device_create_global() Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 03/11] tmpfs: Add sub-filesystem data pointer to shmem_sb_info Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 04/11] ramfs: Add sub-filesystem data pointer to ram_fs_info Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 05/11] devtmpfs: Add support for mounting in user namespaces Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 06/11] drivers/char/mem.c: Make null/zero/full/random/urandom available to " Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 07/11] block: Make partitions inherit namespace from whole disk device Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 08/11] block: Allow blkdev ioctls within user namespaces Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 09/11] misc: Make loop-control available to all " Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 10/11] loop: Assign devices to current_user_ns() Seth Forshee
2014-05-14 21:34 ` [RFC PATCH 11/11] loop: Allow priveleged operations for root in the namespace which owns a device Seth Forshee
2014-05-23  5:48   ` Marian Marinov
2014-05-26  9:16     ` Seth Forshee
2014-05-26 15:32       ` [lxc-devel] " Michael H. Warfield
2014-05-26 15:45         ` Seth Forshee
2014-05-27  1:36         ` Serge E. Hallyn
2014-05-27  2:39           ` Michael H. Warfield
2014-05-27  7:16             ` Seth Forshee
2014-05-27 13:16             ` Serge Hallyn
2014-05-15  1:32 ` [RFC PATCH 00/11] Add support for devtmpfs in user namespaces Greg Kroah-Hartman
2014-05-15  2:17   ` [lxc-devel] " Michael H. Warfield
2014-05-15  3:15     ` Seth Forshee
2014-05-15  4:00       ` Greg Kroah-Hartman
2014-05-15 13:42         ` Michael H. Warfield
2014-05-15 14:08           ` Greg Kroah-Hartman
2014-05-15 17:42             ` Serge Hallyn
2014-05-15 18:12               ` Seth Forshee [this message]
2014-05-15 22:15               ` Greg Kroah-Hartman
2014-05-16  1:42                 ` Michael H. Warfield
2014-05-16  7:56                   ` Richard Weinberger
2014-05-16 19:20                   ` James Bottomley
2014-05-16 19:42                     ` Michael H. Warfield
2014-05-16 19:52                       ` [lxc-devel] Mount and other notifiers, was: " James Bottomley
2014-05-16 20:04                         ` Michael H. Warfield
2014-05-16  1:49                 ` [lxc-devel] " Serge Hallyn
2014-05-16  4:35                   ` Greg Kroah-Hartman
2014-05-16 14:06                     ` Seth Forshee
2014-05-16 15:28                       ` Michael H. Warfield
2014-05-16 15:43                         ` Seth Forshee
2014-05-16 18:57                       ` Greg Kroah-Hartman
2014-05-16 19:28                         ` James Bottomley
2014-05-16 20:18                           ` Seth Forshee
2014-05-20  0:04                             ` Eric W. Biederman
2014-05-20  1:14                               ` Michael H. Warfield
2014-05-20 14:18                                 ` Serge Hallyn
2014-05-20 14:21                               ` Seth Forshee
2014-05-21 22:00                                 ` Eric W. Biederman
2014-05-21 22:33                                   ` Serge Hallyn
2014-05-23 22:23                                     ` Eric W. Biederman
2014-05-28  9:26                                       ` Seth Forshee
2014-05-28 13:12                                         ` Serge E. Hallyn
2014-05-28 20:33                                           ` Eric W. Biederman
2014-05-18  2:42                           ` Serge E. Hallyn
2014-05-17  4:31                     ` Eric W. Biederman
2014-05-17 16:01                       ` Seth Forshee
2014-05-18  2:44                         ` Serge E. Hallyn
2014-05-19 13:27                           ` Seth Forshee
2014-05-20 14:15                             ` Serge Hallyn
2014-05-20 14:26                               ` Serge Hallyn
2014-05-17 12:57                     ` Michael H. Warfield
2014-05-15 18:25             ` Richard Weinberger
2014-05-15 19:50               ` Serge Hallyn
2014-05-15 20:13                 ` Richard Weinberger
2014-05-15 20:26                   ` Serge E. Hallyn
2014-05-15 20:33                     ` Richard Weinberger
2014-05-19 20:22                     ` Andy Lutomirski
2014-05-20 14:19                       ` Serge Hallyn
2014-05-23  8:20                         ` Marian Marinov
2014-05-23 13:16                           ` James Bottomley
2014-05-23 16:39                             ` Andy Lutomirski
2014-05-24 22:25                             ` Serge Hallyn
2014-05-25  8:12                               ` James Bottomley
2014-05-25 22:24                                 ` Serge E. Hallyn
2014-05-28  7:02                                   ` James Bottomley
2014-05-28 13:49                                     ` Serge Hallyn

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