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Date: Thu, 26 Sep 2002 15:41:59 +0100
From: Christoph Hellwig <hch@infradead.org>
To: "Theodore Ts'o" <tytso@mit.edu>, Jakob Oestergaard <jakob@unthought.net>,
       "Stephen C. Tweedie" <sct@redhat.com>, linux-kernel@vger.kernel.org,
       Andrew Morton <akpm@zip.com.au>
Subject: Re: jbd bug(s) (?)
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	Theodore Ts'o <tytso@mit.edu>,
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On Thu, Sep 26, 2002 at 10:25:04AM -0400, Theodore Ts'o wrote:
> My mistake.  At one point I was talking to Mark Lord and I had gotten

					     ^^^ Stephen Lord

> the impression they had some Irix-VM-to-Linux-VM mapping layer which
> would make blocksize > PAGE_SIZE possible.

The pagebuf layer presents and inferface similar enough to the IRIX
buffercache to XFS and is layered ontop of the Linux pagecache.  Today
it's only used for metadata and allows mapping of > PAGE_CACHE_SIZE
objects there (see the vmap/vunmap code I added to vmalloc.c in 2.5
for that).  But it's not used for data I/O at all anymore and it would
also have problems for blocksize > PAGE_CACHE_SIZE.

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