From: Leon Woestenberg <leon.woestenberg@gmail.com>
To: Steve Rottinger <steve@pentek.com>
Cc: linux-kernel@vger.kernel.org, leon@sidebranch.com
Subject: Re: O_DIRECT splice from PCI-resident buffer to filesystem
Date: Wed, 3 Jun 2009 12:25:12 +0200 [thread overview]
Message-ID: <c384c5ea0906030325q437a299dkf65d47f7f9956f8a@mail.gmail.com> (raw)
In-Reply-To: <4A202FF3.2090600@pentek.com>
Steve,
On Fri, May 29, 2009 at 8:56 PM, Steve Rottinger <steve@pentek.com> wrote:
> After some work, and kernel hacking, and thanks to Jens'
> O_DIRECT/blockio splicing
> patch, I have been successful in using splice to transfer data directly
> from a buffer
> resident on a PCI device to a raw disk partition, with zero copies. Great!
>
As we have no in-kernel character devices with splice_read/write
capability (other than /dev/null and maybe zero) *AFAIK*,
I would like to adapt my driver in staging/ to support splice_read()/write().
The difference is that my PCIe driver (altpciechdma.c) performs DMA
into a scattered set of pages. These pages are then
splice()d over.
Could you share the splice part of your driver for this purpose, so
that I can add splice_read() with less effort?
Regards,
--
Leon
prev parent reply other threads:[~2009-06-03 10:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-29 18:56 Steve Rottinger
2009-06-03 10:25 ` Leon Woestenberg [this message]
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