From: Andy Whitcroft <apw@canonical.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: NeilBrown <neilb@suse.de>, Miklos Szeredi <miklos@szeredi.hu>,
viro@ZenIV.linux.org.uk, torvalds@linux-foundation.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
nbd@openwrt.org, hramrach@centrum.cz, jordipujolp@gmail.com,
ezk@fsl.cs.sunysb.edu, mszeredi@suse.cz
Subject: Re: [PATCH 0/7] overlay filesystem: request for inclusion
Date: Thu, 9 Jun 2011 14:49:47 +0100 [thread overview]
Message-ID: <20110609134947.GD13242@shadowen.org> (raw)
In-Reply-To: <20110608205233.ebfedc4d.akpm@linux-foundation.org>
On Wed, Jun 08, 2011 at 08:52:33PM -0700, Andrew Morton wrote:
> > > This sort of thing could be implemented in userspace and wired up via
> > > fuse, I assume. Has that been attempted and why is it inadequate?
> >
> > I think that would be a valid question if the proposal was large and
> > complex. But overlayfs is really quite small and self-contained.
>
> Not merging it would be even smaller and simpler. If there is a
> userspace alternative then that option should be evaluated and compared
> in a rational manner.
For the Ubuntu liveCD we have tried to use unions via fuse with a view
to dropping aufs2 as an external module. The performance was atrocious
(IIRC of the order of 10x slower), to the point that most people assumed
it was broken and reset the machine.
The other use case I have seen here have been for package builders on which
a virgin chroot has a writable layer dropped on top, allowing simple undo
at the end of the build. I have heard of people wanting to use this for
root filesystems for virtual machines as well.
We have done quite a bit of testing with liveCDs built to use overlayfs
with a view to switching over, and have been very impressed with its
stability. It is also pleasing to see an implementation which is small
enough to actually understand.
-apw
next prev parent reply other threads:[~2011-06-09 13:49 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-01 12:46 [PATCH 0/7] overlay filesystem: request for inclusion Miklos Szeredi
2011-06-01 12:46 ` [PATCH 1/7] vfs: add i_op->open() Miklos Szeredi
2011-06-01 12:46 ` [PATCH 2/7] vfs: export do_splice_direct() to modules Miklos Szeredi
2011-06-01 12:46 ` [PATCH 3/7] vfs: introduce clone_private_mount() Miklos Szeredi
2011-06-01 12:46 ` [PATCH 4/7] overlay filesystem Miklos Szeredi
2011-06-01 12:46 ` [PATCH 5/7] overlayfs: add statfs support Miklos Szeredi
2011-06-01 12:46 ` [PATCH 6/7] overlayfs: implement show_options Miklos Szeredi
2011-06-01 12:46 ` [PATCH 7/7] overlay: overlay filesystem documentation Miklos Szeredi
2011-06-08 22:32 ` [PATCH 0/7] overlay filesystem: request for inclusion Andrew Morton
2011-06-09 1:59 ` NeilBrown
2011-06-09 3:52 ` Andrew Morton
2011-06-09 12:47 ` Miklos Szeredi
2011-06-09 19:38 ` Andrew Morton
2011-06-09 19:49 ` Felix Fietkau
2011-06-09 22:02 ` Miklos Szeredi
2011-06-10 3:48 ` J. R. Okajima
2011-06-10 9:31 ` Francis Moreau
2011-06-16 18:27 ` Ric Wheeler
2011-06-10 10:19 ` Michal Suchanek
2011-06-12 7:44 ` J. R. Okajima
2011-06-13 18:48 ` Miklos Szeredi
2011-07-08 14:44 ` Miklos Szeredi
2011-07-08 15:21 ` Tomas M
2011-07-09 12:22 ` J. R. Okajima
2011-07-15 12:33 ` Miklos Szeredi
2011-07-15 13:02 ` J. R. Okajima
2011-07-15 13:04 ` J. R. Okajima
2011-07-15 13:07 ` Miklos Szeredi
2011-07-15 13:33 ` J. R. Okajima
2011-07-15 15:16 ` Miklos Szeredi
2011-06-09 13:49 ` Andy Whitcroft [this message]
2011-06-09 19:32 ` Andrew Morton
2011-06-09 19:40 ` Linus Torvalds
2011-06-09 20:17 ` Miklos Szeredi
2011-06-09 22:58 ` Anton Altaparmakov
2011-06-11 2:39 ` Greg KH
2011-06-12 20:51 ` Anton Altaparmakov
2011-06-10 11:51 ` Bernd Schubert
2011-06-10 12:45 ` Michal Suchanek
2011-06-10 12:54 ` Bernd Schubert
2011-06-09 13:57 ` Michal Suchanek
2011-06-09 13:57 ` Andy Whitcroft
2011-07-05 19:54 ` Hans-Peter Jansen
2011-07-08 12:57 ` Miklos Szeredi
2011-07-10 8:23 ` Ric Wheeler
2011-07-10 13:55 ` Sorin Faibish
2011-07-12 15:59 ` Miklos Szeredi
2011-07-10 11:16 ` Hans-Peter Jansen
2011-07-12 16:15 ` Miklos Szeredi
[not found] ` <4540f7aa16724111bd792a1d577261c2@HUBCAS1.cs.stonybrook.edu>
2011-06-16 6:51 ` Erez Zadok
2011-06-16 9:45 ` Michal Suchanek
2011-06-16 10:45 ` Jordi Pujol
2011-06-16 15:15 ` J. R. Okajima
2011-06-16 16:09 ` Miklos Szeredi
2011-06-16 22:59 ` J. R. Okajima
2011-07-08 14:40 ` Miklos Szeredi
2011-07-09 12:18 ` J. R. Okajima
2011-07-15 10:59 ` Miklos Szeredi
[not found] ` <b624059d70d546d4a4ecb940613235ab@HUBCAS2.cs.stonybrook.edu>
[not found] ` <BF42D8D9-B947-448A-8818-BCA786E75325@fsl.cs.sunysb.edu>
2011-06-16 23:41 ` J. R. Okajima
[not found] ` <ab75a25c918145569b721dea9aea5506@HUBCAS2.cs.stonybrook.edu>
[not found] ` <BF19F4F8-9E0F-4983-87C1-BB1B0A11D011@fsl.cs.sunysb.edu>
2011-06-17 1:49 ` J. R. Okajima
[not found] <20110609125114.8dff08da.akpm@linux-foundation.org>
2011-06-10 6:57 ` Fw: " Valerie Aurora
2011-06-10 9:01 ` Alan Cox
2011-06-15 11:19 ` Miklos Szeredi
2011-06-15 14:32 ` J. R. Okajima
2011-06-15 15:49 ` Miklos Szeredi
2011-06-15 16:14 ` J. R. Okajima
2011-06-15 17:20 ` Michal Suchanek
2011-06-15 18:12 ` Miklos Szeredi
2011-06-16 2:43 ` J. R. Okajima
2011-06-16 10:35 ` Michal Suchanek
2011-06-16 15:15 ` J. R. Okajima
2011-06-17 7:38 ` Michal Suchanek
2011-06-20 0:43 ` J. R. Okajima
[not found] ` <803fd88dc28748428861b75afdee3575@HUBCAS1.cs.stonybrook.edu>
2011-06-16 0:44 ` Erez Zadok
2011-06-16 3:07 ` J. R. Okajima
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