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From: Bique Alexandre <alexandre.bique@citrix.com>
Subject: Re: [Qemu-devel] [PATCH] ATAPI pass through
Date: Tue, 30 Jun 2009 18:55:42 +0100
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To: Christoph Hellwig <hch@lst.de>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Tuesday 30 June 2009 18:01:00 Christoph Hellwig wrote:
> On Tue, Jun 30, 2009 at 04:34:53PM +0100, Bique Alexandre wrote:
> >  - I exported the data structure BDRVRawState from raw-posix.c in
> > raw-posix.h, because I use the file descriptor of the bsg device to poll,
> > write and read. Maybe there is a better solution, but I didn't find what
> > I was looking for in block.h.
>
> The way we do scsi passthrough (and ATAPI really just is SCSI
> passthrough over ATA with a slightly special command set) is to call
> into the ioctl/aio_ioctl methods of the block driver and let that do
> the actual I/O.  I think your patch would be simpler and cleaner by
> following that model

I can switch to aio_ioctl, and use CDROM_SEND_PACKET ioctl.
Is it possible to send multiple requests at the same time with aio_ioctl ? 
When CONFIG_AIO is not available ?

Thanks.
-- 
Alexandre Bique