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

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Message-ID: <20090225195411.GI2645@elf.ucw.cz>
Date:	Wed, 25 Feb 2009 20:54:11 +0100
From:	Pavel Machek <pavel@....cz>
To:	jim owens <jowens@...com>
Cc:	Chris Mason <chris.mason@...cle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Eric Sesterhenn <snakebyte@....de>,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: Warning and BUG with btrfs and corrupted image

On Thu 2009-02-05 09:19:28, jim owens wrote:
> Pavel Machek wrote:
>>> If you don't want it, don't compile it in.  The Kconfig text is very
>>> clear.
>>
>> No, I'd not expect that option to panic systems. That's why I
>> suggested:
>>
>> diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
>> index 29228f5..b7ac847 100644
>> --- a/fs/xfs/Kconfig
>> +++ b/fs/xfs/Kconfig
>> @@ -77,4 +77,7 @@ 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.
>
> If you really want a better warning it should simply be:
>
>           Choosing Y will make XFS panic on survivable events.

Can we get that line there?

> I understand you may have a concern that "normal users" will select
> the debug option by mistake, but I don't think that is realistic.
> My experience is they will not build custom debug kernels even if
> you beg them to.  They will only use the distro build and a
> distro should never turn this option on outside their own labs.
>
> Any non-xfs kernel developer who turns this on and gets
> snake bit will only do it once.

One bite per developer is one bite too many..
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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