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Date: Fri, 09 Jun 2006 14:43:08 -0400
From: Jeff Garzik <jeff@garzik.org>
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To: Alex Tomas <alex@clusterfs.com>
CC: Linus Torvalds <torvalds@osdl.org>, Andreas Dilger <adilger@clusterfs.com>,
       Andrew Morton <akpm@osdl.org>,
       ext2-devel <ext2-devel@lists.sourceforge.net>,
       linux-kernel@vger.kernel.org, cmm@us.ibm.com,
       linux-fsdevel@vger.kernel.org
Subject: Re: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
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Alex Tomas wrote:
>>>>>> Linus Torvalds (LT) writes:
>  LT> My point is, maintaining two different pieces is SIMPLER.
> 
> "different" is a key word here. why should we copy most of ext3 code
> into ext4?
> 
>  LT> It would be bigger, if you made ext3 do 48-bit block numbers.
> 
> nope, we re-use existing i_data w/o any changes. yes, we've made
> inode a bit larger to cache last found extent. this improves
> performance in some workloads noticable though.
> 
>  LT> See? ext3 would become strictly _worse_ for the majority of users, who 
>  LT> wouldn't get any advantage. That's my point.
> 
> would "#if CONFIG_EXT3_EXTENTS" be a good solution then?

No, that would be worse.

	Jeff