linux-kernel - Re: Ok, explained.. (was Re: [PATCH] mm: fix page_mkclean

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Date:	Fri, 29 Dec 2006 16:33:16 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Segher Boessenkool <segher@...nel.crashing.org>,
	David Miller <davem@...emloft.net>, nickpiggin@...oo.com.au,
	kenneth.w.chen@...el.com, guichaz@...oo.fr, hugh@...itas.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ranma@...edrich.de, gordonfarquharson@...il.com,
	a.p.zijlstra@...llo.nl, tbm@...ius.com, arjan@...radead.org,
	andrei.popa@...eo.ro
Subject: Re: Ok, explained.. (was Re: [PATCH] mm: fix page_mkclean_one)

On Fri, 29 Dec 2006 16:11:44 -0800 (PST)
Linus Torvalds <torvalds@...l.org> wrote:

> 
> 
> > JBD implements physical block-based journalling, so it is 100% appropriate
> > that JBD deal with these disk blocks using their buffer_head
> > representation.
> 
> And as long as it does that, you just have to face the fact that it's 
> going to perform like crap, including what you call "extra" writes, and 
> what I call "deal with it".

It is quite tiresome to delete things which your interlocutor said and to
then restate them as if it were some sort of relevation.

> > Somewhat nastily, but as ext3 directories are metadata it is appropriate
> > that modifications to them be done in terms of buffer_heads (ie: blocks).
> 
> No. There is nothing "appropriate" about using buffer_heads for metadata. 

I said "modification".

> [stuff about directory reads elided]

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