From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH 0/3] map multiple blocks in get_block() and
 mpage_readpages()
Date: Wed, 22 Feb 2006 17:59:23 -0800
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To: Nathan Scott <nathans@sgi.com>
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Nathan Scott <nathans@sgi.com> wrote:
>
> There's four extra bytes on an 88 byte structure (with sector_t
>  CONFIG'd at 64 bits)

oy, buffer_heads are 48 bytes - took a few months out of my life, that did.
That's where it most counts - memory-constrained non-LBD 32-bit platforms.

Making b_size size_t doesn't affect that, so..