linux-kernel - Re: [PATCH 3/3] block: loop: use vfs ITER

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Date:	Tue, 24 Mar 2015 11:31:48 +0100
From:	Christoph Hellwig <hch@....de>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@....de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Maxim Patlasov <mpatlasov@...allels.com>
Subject: Re: [PATCH 3/3] block: loop: use vfs ITER_BVEC to read/write
	backing file

On Sun, Mar 22, 2015 at 04:14:54PM +0800, Ming Lei wrote:
> Now loop code gets simplified a lot, and becomes more clean.
> 
> Also one extra page copy is avoided for READ in case of none
> transfer.

I really don't like the mess with the wrappers to pretent that read/write
work the same, and the ibvec_rw_data structure doesn't exactly help
readability either.
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