linux-kernel - Re: [PATCH v5 5/5] block: loop: support DIO & AIO

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Message-ID: <20150622160002.GB10307@infradead.org>
Date:	Mon, 22 Jun 2015 09:00:02 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Jens Axboe <axboe@...nel.dk>, Zach Brown <zab@...bo.net>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Tejun Heo <tj@...nel.org>, Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v5 5/5] block: loop: support DIO & AIO

On Mon, Jun 22, 2015 at 08:09:55PM +0800, Ming Lei wrote:
> For the general async interface, it is a bit complicated than sync interfaces:
> 
> -  iocb need to be one parameter, because it often depends on callers, such
> as loop can preallocate it
> - direct I/O need to be another parameter(in loop we can use the same helper
> to handle sync request)
> - bvec and the segment number are another two parameters
> - not mention the common parameters(file, offset, pos, complete...)

We only really need iocb + iov_iter, they carry everything we need.

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