From: David Howells <dhowells@redhat.com>
To: Ric Wheeler <ricwheeler@gmail.com>
Cc: dhowells@redhat.com, Michal Suchanek <hramrach@centrum.cz>,
Alexander Viro <aviro@redhat.com>, Ian Kent <ikent@redhat.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Jeff Moyer <jmoyer@redhat.com>,
miklos@szeredi.hu, Christoph Hellwig <hch@infradead.org>
Subject: Re: Union mount and overlayfs bake off?
Date: Wed, 29 Jun 2011 11:17:36 +0100 [thread overview]
Message-ID: <2477.1309342656@redhat.com> (raw)
In-Reply-To: <4E0AF2BA.2040706@gmail.com>
Ric Wheeler <ricwheeler@gmail.com> wrote:
> I think that it has been a while since David reposted the refreshed patch set
> for union mounts & know that overlayfs has recent updates as well.
>
> Despite that, I have not seen a lot of feedback from reviewers or testers.
The main problem I've got is that it causes lockdep to generate warnings when
the top layer and one of the lower layers are of the same filesystem type. The
obvious way round this is to give each superblock its own i_mutex lock class
rather than putting this in the file_system_type struct, but I'm not sure of
the consequences (the two obvious problems are superblock transience and the
fact that there may be so many more of them that it may explode lockdep).
I've split out some of the VFS patches that we might be interested in taking
upstream anyway. They're currently sat on Al's plate for his consideration.
I've been dealing with some of Al's issues with the unionmount patches, but I
know he's got more - I just can't remember them all.
David
next prev parent reply other threads:[~2011-06-29 10:17 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-12 15:00 Unionmount status? Michal Suchanek
2011-04-12 20:31 ` Ric Wheeler
2011-04-12 21:36 ` Michal Suchanek
2011-04-13 14:18 ` Jiri Kosina
2011-04-13 15:13 ` Michal Suchanek
2011-04-14 8:38 ` Miklos Szeredi
2011-04-14 9:48 ` Sedat Dilek
2011-04-14 9:58 ` Miklos Szeredi
2011-04-15 11:22 ` Michal Suchanek
2011-04-15 11:31 ` Miklos Szeredi
2011-04-15 11:51 ` Michal Suchanek
2011-04-15 12:29 ` Miklos Szeredi
2011-04-15 12:34 ` Michal Suchanek
2011-04-15 12:48 ` Miklos Szeredi
2011-04-15 21:48 ` Hugh Dickins
2011-04-15 22:18 ` Andreas Dilger
2011-04-18 13:31 ` Michal Suchanek
2011-04-19 20:04 ` [PATCH] tmpfs: implement generic xattr support Miklos Szeredi
2011-04-20 2:18 ` Phillip Lougher
2011-04-20 13:43 ` Miklos Szeredi
2011-04-21 6:59 ` Michal Suchanek
2011-04-21 9:08 ` Miklos Szeredi
2011-04-21 10:59 ` Michal Suchanek
2011-04-21 14:58 ` Jordi Pujol
2011-04-21 15:22 ` Michal Suchanek
2011-04-21 15:43 ` Michal Suchanek
2011-04-21 17:26 ` Miklos Szeredi
2011-04-21 19:17 ` Michal Suchanek
2011-04-20 16:00 ` Serge E. Hallyn
2011-05-12 4:20 ` Hugh Dickins
2011-05-12 7:52 ` Michal Suchanek
2011-05-12 12:27 ` Miklos Szeredi
2011-05-12 14:00 ` Miklos Szeredi
2011-05-12 16:52 ` Hugh Dickins
2011-04-18 13:34 ` Unionmount status? Michal Suchanek
2011-04-18 13:37 ` Michal Suchanek
2011-04-13 17:26 ` Ric Wheeler
2011-04-13 18:58 ` Michal Suchanek
2011-04-13 19:11 ` Ric Wheeler
2011-04-13 19:47 ` Michal Suchanek
2011-04-14 4:50 ` Ian Kent
2011-04-14 9:32 ` Michal Suchanek
2011-04-14 9:40 ` Miklos Szeredi
2011-04-14 13:21 ` Ric Wheeler
2011-04-14 14:54 ` Michal Suchanek
2011-04-15 16:31 ` Ric Wheeler
2011-04-14 19:14 ` David Howells
2011-06-29 9:39 ` Union mount and overlayfs bake off? Ric Wheeler
2011-06-29 11:40 ` Michal Suchanek
2011-06-29 10:17 ` David Howells [this message]
2011-06-30 12:44 ` Miklos Szeredi
2011-07-10 8:28 ` Union mount and lockdep design issues Ric Wheeler
2011-07-10 13:48 ` Peter Zijlstra
2011-07-11 8:35 ` Michal Suchanek
2011-07-11 11:01 ` David Howells
2011-07-11 12:00 ` Peter Zijlstra
2011-07-11 13:36 ` Michal Suchanek
2011-07-11 13:50 ` Ian Kent
2011-07-11 16:17 ` Michal Suchanek
2011-07-11 17:23 ` Ian Kent
2011-07-11 18:08 ` Michal Suchanek
2011-07-12 8:30 ` Miklos Szeredi
2011-07-12 9:58 ` Michal Suchanek
2011-07-12 11:45 ` Miklos Szeredi
2011-07-12 18:49 ` Michal Suchanek
2011-07-13 9:49 ` Miklos Szeredi
2011-07-13 12:02 ` David Howells
2011-07-13 13:20 ` Miklos Szeredi
2011-07-14 0:57 ` David Howells
2011-07-11 13:54 ` David Howells
2011-07-11 14:02 ` Peter Zijlstra
2011-07-11 14:50 ` [PATCH 1/2] VFS: Pass mount flags to sget() David Howells
2011-07-11 14:50 ` [PATCH 2/2] union-mount: Duplicate the i_{, dir_}mutex lock classes and use for upper layer David Howells
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=2477.1309342656@redhat.com \
--to=dhowells@redhat.com \
--cc=aviro@redhat.com \
--cc=hch@infradead.org \
--cc=hramrach@centrum.cz \
--cc=ikent@redhat.com \
--cc=jmoyer@redhat.com \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=miklos@szeredi.hu \
--cc=ricwheeler@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).