netdev - Re: [PATCH RFC 2/4] aio: prefer aio_op op over iter

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Date:	Thu, 12 Mar 2015 06:48:25 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Tadeusz Struk <tadeusz.struk@...el.com>
Cc:	davem@...emloft.net, linux-aio@...ck.org,
	herbert@...dor.apana.org.au, netdev@...r.kernel.org,
	ying.xue@...driver.com, bcrl@...ck.org,
	linux-fsdevel@...r.kernel.org, hch@....de,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH RFC 2/4] aio: prefer aio_op op over iter_op

On Wed, Mar 11, 2015 at 03:46:18PM -0700, Tadeusz Struk wrote:
> AIO interface should prefer AIO operations over iter_op

What the devil for?  read_iter and write_iter *ARE* aio operations, as much
as soon to be removed aio_read and aio_write.  And yes, those are going to
be removed very soon.

Note that ->read_iter() and ->write_iter() are getting iocb pointer passed
to them.  It's just that socket instances are not passing it along to
->sendmsg/->recvmsg anymore.

And why, in name of everything unholy, do your methods get redundant
total_len argument?  It's iov_iter_count(&msg->msg_iter) (and in iov_iter-net
I have an inline helper doing that - enough places open-coding that thing).
If nothing else, ->sendmsg() and ->recvmsg() would benefit from removing
that argument as well.  I have patches doing that, but iocb removal conflicts
with them and they need to be rebased to current net/master...
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