linux-kernel - Re: [PATCH v2 1/4] aio: add aio_kernel

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Date:	Mon, 26 Jan 2015 09:00:48 -0800
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>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	"open list:AIO" <linux-aio@...ck.org>
Subject: Re: [PATCH v2 1/4] aio: add aio_kernel_() interface

On Tue, Jan 27, 2015 at 12:18:23AM +0800, Ming Lei wrote:
> > Also it might make sense to just offer aio_kernel_read/write intefaces
> > instead of the common submit wrapper, as that's much closer to other
> > kernel APIs, e.g.
> >
> > int aio_kernel_read(struct kiocb *iocb, struct file *file,
> >                 struct iov_iter *iter, loff_t off,
> >                 void (*complete)(struct kiocb *iocb, long res));
> > int aio_kernel_write(struct kiocb *iocb, struct file *file,
> >                 struct iov_iter *iter, loff_t off,
> >                 void (*complete)(struct kiocb *iocb, long res));
> 
> It is like style of sync APIs, looks submit/complete is common
> for async APIs, like io_submit().

io_submit is a fairly horrible API.  While Posix AIO isn't too much
better it does have separate APIs for read/write.  Given that there
isn't much code shared I'd keep an API that feels familar.

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