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From: Christoph Hellwig <hch@infradead.org>
Subject: Re: linux-next: manual merge of the block tree with the  tree
Date: Fri, 8 Nov 2013 00:02:21 -0800
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To: Kent Overstreet <kmo@daterainc.com>
Cc: Christoph Hellwig <hch@infradead.org>, Dave Kleikamp <dave.kleikamp@oracle.com>, Stephen Rothwell <sfr@canb.auug.org.au>, Jens Axboe <axboe@kernel.dk>, linux-next@vger.kernel.org, linux-kernel@vger.kernel.org, Zach Brown <zab@zabbo.net>, Olof Johansson <olof@lixom.net>, Andrew Morton <akpm@linux-foundation.org>

On Thu, Nov 07, 2013 at 11:56:17PM -0800, Kent Overstreet wrote:
> So, I don't think the iov_iter stuff is the right approach for solving
> the loop issue; it's an ugly hack and after immutable biovecs we're
> pretty close to a better solution and some major cleanups too.

All the consumers aren't limited to a block-based filesystem backing,
including loop.  So we need a file-ops based approach for in-kernel
dio/aio.  If you have a counter proposal please at least describe it.