linux-kernel - Re: splice methods in character device driver

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Message-ID: <20090613072611.GO11363@kernel.dk>
Date:	Sat, 13 Jun 2009 09:26:11 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Leon Woestenberg <leon.woestenberg@...il.com>
Cc:	Steve Rottinger <steve@...tek.com>, linux-kernel@...r.kernel.org
Subject: Re: splice methods in character device driver

On Sat, Jun 13 2009, Leon Woestenberg wrote:
> Hello Jens,
> 
> On Mon, Jun 8, 2009 at 9:05 AM, Jens Axboe<jens.axboe@...cle.com> wrote:
> > On Sat, Jun 06 2009, Leon Woestenberg wrote:
> >> How can I pass information from the splice_read(), which spawns a hardware
> >> DMA to the pages in my case, to the confirm() hook which is called at some
> >> (random) time in the future?
> >
> > There's a ->private for each pipe_buffer, so you can pass along info on
> > a per-page granularity.
> >
> So, this means in my driver's splice_read(), I must set
> pipe->bufs[i]->private for each 0 <= i < PIPE_BUFFERS?

Yes. There's no way to make it bigger granularity, since you could have
a mix of source pages in the pipe.

-- 
Jens Axboe

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