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From: Andreas Dilger <adilger@sun.com>
To: Rik van Riel <riel@redhat.com>
Cc: Daniel Phillips <phillips@google.com>,
Pavel Machek <pavel@ucw.cz>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
Theodore Tso <tytso@mit.edu>, Al Boldi <a1426z@gawab.com>,
Valerie Henson <val.henson@gmail.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck)
Date: Thu, 17 Jan 2008 00:38:38 -0700 [thread overview]
Message-ID: <20080117073838.GL3351@webber.adilger.int> (raw)
In-Reply-To: <20080115220528.139da08a@bree.surriel.com>
On Jan 15, 2008 22:05 -0500, Rik van Riel wrote:
> With a filesystem that is compartmentalized and checksums metadata,
> I believe that an online fsck is absolutely worth having.
>
> Instead of the filesystem resorting to mounting the whole volume
> read-only on certain errors, part of the filesystem can be offlined
> while an fsck runs. This could even be done automatically in many
> situations.
In ext4 we store per-group state flags in each group, and the group
descriptor is checksummed (to detect spurious flags), so it should
be relatively straight forward to store an "error" flag in a single
group and have it become read-only.
As a starting point, it would be worthwhile to check instances of
ext4_error() to see how many of them can be targetted at a specific
group. I'd guess most of them could be (corrupt inodes, directory
and indirect blocks, incorrect bitmaps).
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
next prev parent reply other threads:[~2008-01-17 7:38 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-08 21:22 [RFD] Incremental fsck Al Boldi
2008-01-08 21:31 ` Alan
2008-01-09 9:16 ` Andreas Dilger
2008-01-12 23:55 ` Daniel Phillips
2008-01-08 21:41 ` Rik van Riel
2008-01-09 4:40 ` Al Boldi
2008-01-09 7:45 ` Valerie Henson
2008-01-09 11:52 ` Al Boldi
2008-01-09 14:44 ` Rik van Riel
2008-01-10 13:26 ` Al Boldi
2008-01-12 14:51 ` Theodore Tso
2008-01-13 11:05 ` Al Boldi
2008-01-13 17:19 ` Pavel Machek
2008-01-13 17:41 ` Alan Cox
2008-01-15 20:16 ` [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Pavel Machek
2008-01-15 21:43 ` David Chinner
2008-01-15 23:07 ` Pavel Machek
2008-01-15 23:44 ` Daniel Phillips
2008-01-16 0:15 ` Alan Cox
2008-01-16 1:24 ` Daniel Phillips
2008-01-16 1:36 ` Chris Mason
2008-01-17 20:54 ` Pavel Machek
2008-01-16 19:06 ` Bryan Henderson
2008-01-16 20:05 ` Alan Cox
2008-01-17 2:02 ` Daniel Phillips
2008-01-17 21:37 ` Bryan Henderson
2008-01-17 22:45 ` Theodore Tso
2008-01-17 22:58 ` Alan Cox
2008-01-17 23:18 ` Ric Wheeler
2008-01-18 0:31 ` Bryan Henderson
2008-01-18 14:23 ` Theodore Tso
2008-01-18 15:16 ` [Patch] document ext3 requirements (was Re: [RFD] Incrementalfsck) linux-os (Dick Johnson)
2008-01-19 14:53 ` Pavel Machek
2008-01-18 15:26 ` [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Ric Wheeler
2008-01-18 20:34 ` Jeff Garzik
2008-01-18 22:35 ` Bryan Henderson
2008-01-18 15:08 ` H. Peter Anvin
2008-01-18 17:43 ` Bryan Henderson
2008-01-16 21:28 ` Eric Sandeen
2008-01-16 11:51 ` Pavel Machek
2008-01-16 12:20 ` Valdis.Kletnieks
2008-01-19 14:51 ` Pavel Machek
2008-01-16 16:38 ` Christoph Hellwig
2008-01-16 1:44 ` Daniel Phillips
2008-01-16 3:05 ` Rik van Riel
2008-01-17 7:38 ` Andreas Dilger [this message]
2008-01-16 11:49 ` Pavel Machek
2008-01-16 20:52 ` Valerie Henson
2008-01-17 12:29 ` Szabolcs Szakacsits
2008-01-17 22:51 ` Daniel Phillips
2008-01-15 1:04 ` [RFD] Incremental fsck Ric Wheeler
2008-01-14 0:22 ` Daniel Phillips
2008-01-09 8:04 ` Valdis.Kletnieks
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