linux-kernel - Re: PATCH 3/6 - direct-io: do not merge logically non-contiguous requests

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Date:	Fri, 6 Aug 2010 08:03:58 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>
Cc:	Josef Bacik <josef@...hat.com>, hch@...radead.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: PATCH 3/6 - direct-io: do not merge logically non-contiguous
 requests

Something is deeply wrong here.  Raw block device access has a 1:1
mapping between logical and physical block numbers.  They really should
never be non-contiguous.
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