linux-kernel - Re: [00/17] Large Blocksize Support V3

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Message-ID: <4630BDB1.8090606@argo.co.il>
Date:	Thu, 26 Apr 2007 17:56:49 +0300
From:	Avi Kivity <avi@...o.co.il>
To:	David Chinner <dgc@....com>
CC:	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org, Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: Re: [00/17] Large Blocksize Support V3

David Chinner wrote:
>> Why is it necessary to assume that one filesystem block == one buffer?  
>> Is it for atomicity, efficiency, or something else?
>>     
>
> By definition, really - each filesystem block has it's own state and
> it's own disk mapping and so we need something to carry that
> information around....
>   

Well, for block sizes > PAGE_SIZE, you can just duplicate the mapping 
information (with an offset-in-block bit field) in each page's struct 
page.  But I see from your other posts that there are atomicity and 
performance reasons as well.

-- 
error compiling committee.c: too many arguments to function

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