linux-ext4 - Re: [PATCH] jbd2: If a journal checksum error is detected, propagate the error to ext4

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Message-ID: <20080605162117.GD25477@mit.edu>
Date:	Thu, 5 Jun 2008 12:21:17 -0400
From:	Theodore Tso <tytso@....edu>
To:	Andreas Dilger <adilger@....com>
Cc:	linux-ext4@...r.kernel.org, Girish.Shilamkar@....com
Subject: Re: [PATCH] jbd2: If a journal checksum error is detected,
	propagate the error to ext4

On Wed, Jun 04, 2008 at 09:17:12PM -0600, Andreas Dilger wrote:
> On Jun 04, 2008  19:56 -0400, Theodore Ts'o wrote:
> > If a journal checksum error is detected, the ext4 filesystem will call
> > ext4_error(), and the mount will either continue, become a read-only
> > mount, or cause a kernel panic based on the superblock flags
> > indicating the user's preference of what to do in case of filesystem
> > corruption being detected.
> > 
> > XXX should we simply fail the mount instead in the panic case?
> 
> It does seem that if someone has a bad ext4 root filesystem it would be
> easy to get an unusable system.  That is why there are no "ext3_error"
> or "ext4_error" calls anywhere in ext[34]_fill_super().  They are all
> instead "printk(KERN_ERR ...)" and the mount fails.

Well, failing the mount or panic'ing as the same result for the root
filesystem.  It is rude to panic when mounting a corrupt filesystem,
especially when you could just fail the mount, though.  I'll make that change.

> 
> > diff --git a/scripts/package/Makefile b/scripts/package/Makefile
> > index 5e32607..f758b75 100644
> > --- a/scripts/package/Makefile
> > +++ b/scripts/package/Makefile
> 
> Not sure what the rest of this patch is...
> 

Some ditritus casued by make-kpkg that slipped in.  Oops, sorry about
that.

						- Ted
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