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To: Andreas Dilger <adilger@turbolabs.com>
Cc: Lew Wolfgang <wolfgang@sweet-haven.com>, linux-kernel@vger.kernel.org
Subject: Re: Dump corrupts ext2?
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	<20011010173449.Q10443@turbolinux.com>
From: Doug McNaught <doug@wireboard.com>
Date: 10 Oct 2001 19:55:16 -0400
In-Reply-To: Andreas Dilger's message of "Wed, 10 Oct 2001 17:34:49 -0600"
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Andreas Dilger <adilger@turbolabs.com> writes:

> On Oct 10, 2001  19:11 -0400, Doug McNaught wrote:
> > I'm pretty sure this is because dump reads the block device directly
> > (which is cached in the buffer cache), while the file data for cached
> > files lives in the page cache, and the two caches are no longer
> > coherent (as of 2.4).
> 
> In Linus kernels 2.4.11+ the block devices and filesystems all use the
> page cache, so no more coherency issues.

You're right, of course.  But for most of the lifetime of 2.4 the
above was true...

> Also, I don't think this ever had the potential to corrupt the filesystem,
> but maybe make a slightly bad backup.

Right, might corrupt the dump, but shouldn't hurt the filesystem.  

-Doug
-- 
Let us cross over the river, and rest under the shade of the trees.
   --T. J. Jackson, 1863
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