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Re: [Qemu-devel] [PATCH] ATAPI pass through
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From: |
Christoph Hellwig |
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Subject: |
Re: [Qemu-devel] [PATCH] ATAPI pass through |
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Date: |
Wed, 1 Jul 2009 10:43:25 +0200 |
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User-agent: |
Mutt/1.3.28i |
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.