From: Christoph Hellwig <hch@lst.de>
To: Bique Alexandre <alexandre.bique@citrix.com>
Cc: Christoph Hellwig <hch@lst.de>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH] ATAPI pass through
Date: Wed, 1 Jul 2009 10:43:25 +0200 [thread overview]
Message-ID: <20090701084325.GA2959@lst.de> (raw)
In-Reply-To: <200906301855.42855.alexandre.bique@citrix.com>
On Tue, Jun 30, 2009 at 06:55:42PM +0100, Bique Alexandre wrote:
> I can switch to aio_ioctl, and use CDROM_SEND_PACKET ioctl.
CDROM_SEND_PACKET has a rather horrible API and should be avoided.
Just use SG_IO like the the scsi passthrough code. In fact there might
be some quite a few ways to unify that code if you're motivated.
> Is it possible to send multiple requests at the same time with aio_ioctl ?
SG_IO sends one requests per ioctl, but you can have multiple requests
outstanding on a single file descriptor.
> When CONFIG_AIO is not available ?
aio_ioctl needs CONFIG_AIO - but on Linux hosts where you have
bsd/sg/etc it always is available.
prev parent reply other threads:[~2009-07-01 8:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-30 15:34 [Qemu-devel] [PATCH] ATAPI pass through Bique Alexandre
2009-06-30 16:26 ` Kevin Wolf
2009-06-30 18:10 ` Bique Alexandre
2009-07-01 6:57 ` Alexander Graf
2009-07-01 8:44 ` Christoph Hellwig
2009-07-01 9:36 ` Paul Brook
2009-07-01 11:29 ` Christoph Hellwig
2009-06-30 17:01 ` Christoph Hellwig
2009-06-30 17:55 ` Bique Alexandre
2009-07-01 8:43 ` Christoph Hellwig [this message]
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