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

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Message-ID: <c384c5ea0906121505g7ab137dp3bbc202da0d43bcd@mail.gmail.com>
Date:	Sat, 13 Jun 2009 00:05:09 +0200
From:	Leon Woestenberg <leon.woestenberg@...il.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Steve Rottinger <steve@...tek.com>, linux-kernel@...r.kernel.org
Subject: Re: splice methods in character device driver

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?


struct pipe_buffer {
   ...
   unsigned long private;
};
struct pipe_inode_info {
   ...
   struct pipe_buffer bufs[PIPE_BUFFERS];
};
static int splice_read(..., struct pipe_inode_info *pipe, ...)

Regards,
-- 
Leon
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