linux-ext4 - Re: [dm-devel] Re: jbd2 inside a device mapper module

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Message-id: <4959C5FD.3050305@sun.com>
Date:	Tue, 30 Dec 2008 09:55:57 +0300
From:	Alex Tomas <bzzz@....COM>
To:	Alberto Bertogli <albertito@...tiri.com.ar>
Cc:	Shyam_Iyer@...l.com, dm-devel@...hat.com,
	linux-ext4@...r.kernel.org, tytso@....EDU,
	linux-kernel@...r.kernel.org
Subject: Re: [dm-devel] Re: jbd2 inside a device mapper module

one good thing about JBD is that you can't update target block and csum
atomically. so, either you use some form of COW or you use journalling.
given we already have JBD it'd make sense to use it?

thanks, Alex

Alberto Bertogli wrote:
> I think I'll go with the "two metadatas" approach and see how it goes.
> Worst case scenario is that I have to drop that code, which means to be
> back where I am now, only with one less option.
> 
> Thanks,
> 		Alberto
> 

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