linux-kernel - Re: [PATCH 1/7] Prepare for adding a new readv/writev with user flags.

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Message-ID: <20140915211523.GA5481@infradead.org>
Date:	Mon, 15 Sep 2014 14:15:23 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Milosz Tanski <milosz@...in.com>, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	Mel Gorman <mgorman@...e.de>,
	Volker Lendecke <Volker.Lendecke@...net.de>,
	Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>
Subject: Re: [PATCH 1/7] Prepare for adding a new readv/writev with user
 flags.

On Mon, Sep 15, 2014 at 09:28:28PM +0100, Al Viro wrote:
> On Mon, Sep 15, 2014 at 04:20:17PM -0400, Milosz Tanski wrote:
> > Plumbing the flags argument through the vfs code so they can be passed down to
> > __generic_file_(read/write)_iter function that do the acctual work.
> 
> NAK.  Put these flags into iocb, it'll be less noisy that way.

Fine with me.  My initial prototype had it in the iov_iter type field
which is another possibility.

But if we get rid of the explicit flags field and make it more invisible
I'd really like to add a features field struct file_operations where
instances can advertize that they support it (and other things like
actual AIO support in the future) so that we won't have a situation
like with AIO where we can submit I/O but it might actually still block
anyway because lots of operations don't support it.
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