linux-kernel - Re: [patch 1/3] add the fsblock layer

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Date:	Mon, 25 Jun 2007 09:01:32 +1000
From:	Neil Brown <neilb@...e.de>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [patch 1/3] add the fsblock layer

On Sunday June 24, npiggin@...e.de wrote:
>  
> +#define PG_blocks		20	/* Page has block mappings */
> +

I've only had a very quick look, but this line looks *very* wrong.
You should be using PG_private.

There should never be any confusion about whether ->private has
buffers or blocks attached as the only routines that ever look in
->private are address_space operations  (or should be.  I think 'NULL'
is sometimes special cased, as in try_to_release_page.  It would be
good to do some preliminary work and tidy all that up).

Why do you think you need PG_blocks?

NeilBrown
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