From: Al Boldi <a1426z@gawab.com>
To: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
Cc: Josef Sipek <jsipek@cs.sunysb.edu>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
hch@infradead.org, akpm@osdl.org, viro@ftp.linux.org.uk,
Pavel Machek <pavel@suse.cz>
Subject: Re: [PATCH 00/22][RFC] Unionfs: Stackable Namespace Unification Filesystem
Date: Tue, 5 Sep 2006 07:46:44 +0300 [thread overview]
Message-ID: <200609050746.44502.a1426z@gawab.com> (raw)
In-Reply-To: <20060904125744.GA1961@wohnheim.fh-wedel.de>
Jörn Engel wrote:
> On Sun, 3 September 2006 11:05:08 +0000, Pavel Machek wrote:
> > > - Modifying a Unionfs branch directly, while the union is mounted, is
> > > currently unsupported. Any such change may cause Unionfs to oops
> > > and it can even result in data loss!
> >
> > I'm not sure if that is acceptable. Even root user should be unable to
> > oops the kernel using 'normal' actions.
>
> Direct modification of branches is similar to direct modification of
> block devices underneith a mounted filesystem. While I agree that
> such a thing _should_ not oops the kernel, I'd bet that you can easily
> run a stresstest on a filesystem while randomly flipping bits in the
> block device and get just that.
Not really a fair comparison. The block level is conceptionally totally
different than the fs level, while a stackable fs is within the realms of
the fs level.
> There are bigger problems in unionfs to worry about.
Agreed. Moving basic functionality abstractions into the VFS could easily
alleviate theses kinds of problems.
Thanks!
--
Al
next prev parent reply other threads:[~2006-09-05 4:45 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-01 1:35 Josef Sipek
2006-09-01 1:37 ` [PATCH 01/22][RFC] Unionfs: Documentation Josef Sipek
2006-09-01 7:42 ` Jan Engelhardt
2006-09-01 1:39 ` [PATCH 02/22][RFC] Unionfs: Kconfig and Makefile Josef Sipek
2006-09-01 12:44 ` Jan Engelhardt
2006-09-01 15:32 ` Randy.Dunlap
2006-09-01 1:40 ` [PATCH 03/22][RFC] Unionfs: Branch management functionality Josef Sipek
2006-09-04 11:20 ` Pekka Enberg
2006-09-01 1:41 ` [PATCH 04/22][RFC] Unionfs: Common file operations Josef Sipek
2006-09-01 12:50 ` Jan Engelhardt
2006-09-01 22:20 ` Trond Myklebust
2006-09-01 22:36 ` Shaya Potter
2006-09-01 22:57 ` Trond Myklebust
2006-09-03 1:03 ` Shaya Potter
2006-09-02 2:47 ` Josef Sipek
2006-09-03 4:10 ` Trond Myklebust
2006-09-01 1:42 ` [PATCH 05/22][RFC] Unionfs: Copyup Functionality Josef Sipek
2006-09-04 6:59 ` Jan Engelhardt
2006-09-04 9:25 ` Josef Sipek
2006-09-04 10:41 ` Jan Engelhardt
2006-09-16 22:13 ` Josef Sipek
2006-09-16 22:26 ` Jan Engelhardt
2006-09-17 1:28 ` Shaya Potter
2006-09-01 1:44 ` [PATCH 06/22][RFC] Unionfs: Dentry operations Josef Sipek
2006-09-04 7:04 ` Jan Engelhardt
2006-09-01 1:45 ` [PATCH 07/22][RFC] Unionfs: Directory file operations Josef Sipek
2006-09-04 7:07 ` Jan Engelhardt
2006-09-01 1:47 ` [PATCH 08/22][RFC] Unionfs: Directory manipulation helper functions Josef Sipek
2006-09-04 7:09 ` Jan Engelhardt
2006-09-04 7:23 ` Jeremy Fitzhardinge
2006-09-01 1:48 ` [PATCH 09/22][RFC] Unionfs: File operations Josef Sipek
2006-09-01 3:02 ` Ian Kent
2006-09-04 7:11 ` Jan Engelhardt
2006-09-01 1:49 ` [PATCH 10/22][RFC] Unionfs: Inode operations Josef Sipek
2006-09-04 7:18 ` Jan Engelhardt
2006-09-01 1:50 ` [PATCH 11/22][RFC] Unionfs: Lookup helper functions Josef Sipek
2006-09-04 7:24 ` Jan Engelhardt
2006-09-01 1:51 ` [PATCH 12/22][RFC] Unionfs: Main module functions Josef Sipek
2006-09-04 7:28 ` Jan Engelhardt
2006-09-01 1:53 ` [PATCH 00/22][RFC] Unionfs: Stackable Namespace Unification Filesystem Stephen Rothwell
2006-09-01 17:23 ` Josef Sipek
2006-09-03 17:42 ` Jan Engelhardt
2006-09-03 19:44 ` Josef Sipek
2006-09-04 11:01 ` Pekka Enberg
2006-09-04 23:34 ` Josef Sipek
2006-09-01 1:53 ` [PATCH 13/22][RFC] Unionfs: Readdir state Josef Sipek
2006-09-04 7:30 ` Jan Engelhardt
2006-09-01 1:54 ` [PATCH 14/22][RFC] Unionfs: Rename Josef Sipek
2006-09-01 1:55 ` [PATCH 15/22][RFC] Unionfs: Privileged operations workqueue Josef Sipek
2006-09-04 7:37 ` Jan Engelhardt
2006-09-01 1:56 ` [PATCH 16/22][RFC] Unionfs: Handling of stale inodes Josef Sipek
2006-09-04 7:39 ` Jan Engelhardt
2006-09-01 1:58 ` [PATCH 17/22][RFC] Unionfs: Miscellaneous helper functions Josef Sipek
2006-09-01 1:58 ` [PATCH 18/22][RFC] Unionfs: Superblock operations Josef Sipek
2006-09-04 7:46 ` Jan Engelhardt
2006-09-04 8:24 ` Andreas Schwab
2006-09-01 1:59 ` [PATCH 19/22][RFC] Unionfs: Helper macros/inlines Josef Sipek
2006-09-04 7:49 ` Jan Engelhardt
2006-09-01 2:01 ` [PATCH 20/22][RFC] Unionfs: Internal include file Josef Sipek
2006-09-04 7:54 ` Jan Engelhardt
2006-09-01 2:01 ` [PATCH 21/22][RFC] Unionfs: Unlink Josef Sipek
2006-09-01 2:02 ` [PATCH 22/22][RFC] Unionfs: Include file Josef Sipek
2006-09-04 7:55 ` Jan Engelhardt
2006-09-03 11:05 ` [PATCH 00/22][RFC] Unionfs: Stackable Namespace Unification Filesystem Pavel Machek
2006-09-04 12:57 ` Jörn Engel
2006-09-05 4:46 ` Al Boldi [this message]
2006-09-05 7:01 ` Jörn Engel
2006-09-04 13:28 ` Shaya Potter
2006-09-04 20:33 ` Pavel Machek
2006-09-04 21:43 ` Shaya Potter
2006-09-04 23:31 ` Josef Sipek
2006-09-05 6:02 ` Jan Engelhardt
2006-09-05 13:02 ` Shaya Potter
2006-09-05 3:08 ` Trond Myklebust
2006-09-05 3:28 ` Shaya Potter
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