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

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Message-ID: <CANP1eJFgKOnW7p3fhNAqHQT4gd0AbeFWWDmaKCkiOkB8_U4c_A@mail.gmail.com>
Date:	Mon, 15 Sep 2014 17:44:41 -0400
From:	Milosz Tanski <milosz@...in.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.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.

I'll redo with the flag inside of kiocb for the next submission.

On Mon, Sep 15, 2014 at 5:15 PM, Christoph Hellwig <hch@...radead.org> wrote:
> 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.



-- 
Milosz Tanski
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p: 646-253-9055
e: milosz@...in.com
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