linux-kernel - Re: [11/36] Use page_cache

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Date:	Fri, 31 Aug 2007 09:11:43 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Lameter <clameter@....com>
Cc:	Dmitry Monakhov <dmonakhov@...ru>, torvalds@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>, Mel Gorman <mel@...net.ie>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	"H. Peter Anvin" <hpa@...or.com>, joern@...ybastard.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [11/36] Use page_cache_xxx in fs/buffer.c

On Fri, Aug 31 2007, Christoph Lameter wrote:
> On Fri, 31 Aug 2007, Jens Axboe wrote:
> 
> > > So if we try to push a too large buffer down with submit_bh() we get a 
> > > failure.
> > 
> > Only partly, you may be violating a number of other restrictions (size
> > is many things, not just length of the data).
> 
> Could you be more specific?

Size of a single segment, for instance. Or if the bio crosses a dma
boundary. If your block is 64kb and the maximum segment size is 32kb,
then you would need to clone the bio and split it into two.

Things like that. This isn't a problem with single page requests, as we
based the lower possible boundaries on that.

-- 
Jens Axboe

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