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Re: Snoop DVD (MMC/ATAPI/SCSI) requests

On Sat, Aug 19 2006, Peter ?strand wrote:
> Hi. I'm running Windows as a Guest OS in VMware on Linux. In Windows, a
> closed source application communicates with my DVD writer using VMwares
> virtual DVD, connected to /dev/hdc, which is my DVD writer.
> Now, I'd like to monitor all communication with my DVD. I found out about
> blktrace and it looked very promising. However, I've now discovered that
> blktrace cannot display all data, for example Inquiry Data. This is also
> pointed out by http://lkml.org/lkml/2005/8/23/70:
> "the cdb is dumped, not the data"
> So, are there any other tools that I can use to snoop the DVD
> communication? I've tried strace without luck.

How much data do you need to dump? If it's just inquiry data and small
things like that, I'd just snoop the data in the kernel with some debug
patch and dump it with printk(). Otherwise it would not be hard to add
data dump to blktrace as well.

Jens Axboe

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