linux-kernel - Re: Warning and BUG with btrfs and corrupted image

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Date:	Mon, 26 Jan 2009 17:27:11 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Christoph Hellwig <hch@...radead.org>,
	Eric Sesterhenn <snakebyte@....de>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: Warning and BUG with btrfs and corrupted image

On Wed 2009-01-21 15:00:42, Dave Chinner wrote:
> On Tue, Jan 20, 2009 at 11:20:19PM +0100, Pavel Machek wrote:
> > On Tue 2009-01-20 08:28:29, Christoph Hellwig wrote:
> > > On Tue, Jan 20, 2009 at 11:59:44PM +1100, Dave Chinner wrote:
> > > > > So far the responses from xfs folks have been disappointing, if you are
> > > > > interested in bugreports i can send you some.
> > > > 
> > > > Sure I am.  It would be good if you could start testing XFS along
> > > > with all the other filesystems and report anything you find.
> > > 
> > > I think that was the issue with the debug builds.  If you do this
> > > testing always do it without CONFIG_XFS_DEBUG set as with that option
> > > we intentionally panic on detected disk corruptions.
> > 
> > Uhuh, *_DEBUG options are not supposed to make kernel less
> > stable/robust. Should that crashing functionality be guarded with
> > command line option or something? ext2 has errors=panic mount
> > option...
> 
> No, it's a debugging option that is described as:
> 
> 	"Say N unless you are an XFS developer, or you play one on TV."
> 
> Seriously, if you aren't trying to develop XFS stuff then *don't turn it
> on*.

What about this, then?
									Pavel

---
Warn in documentation that XFS_DEBUG panics machines.

Signed-off-by: Pavel Machek <pavel@...e.cz>

diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
index 3f53dd1..55c98eb 100644
--- a/fs/xfs/Kconfig
+++ b/fs/xfs/Kconfig
@@ -76,4 +76,7 @@ config XFS_DEBUG
 	  Note that the resulting code will be HUGE and SLOW, and probably
 	  not useful unless you are debugging a particular problem.
 
+	  Turning this option on will result in kernel panicking any time
+	  it detects on-disk corruption.
+
 	  Say N unless you are an XFS developer, or you play one on TV.


-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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