XEN special debug information

XEN special debug information

[Lil Evil]

Hi,

I ve been trying to get some information out of xen for a while now.
unfortunately, I failed so far.
I want to do some virtual hard disk write analysis and therefor would need xen to return me the LBA of the sector written.
If been looking into the source code blkback/blkfront, but I have difficulties identifying the write function.
Could anybody kindly point me into the right direction?

thanks very much
lil
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Re: XEN special debug information

[Daniel Stodden]

On Mon, 2008-03-17 at 23:18 +0100, Lil Evil wrote:
> Hi,
> 
> I ve been trying to get some information out of xen for a while now.
> unfortunately, I failed so far.
> I want to do some virtual hard disk write analysis and therefor would need xen to return me the LBA of the sector written.
> If been looking into the source code blkback/blkfront, but I have difficulties identifying the write function.
> Could anybody kindly point me into the right direction?

blkif is rather well documented in xen/include/public/io/blkif.h

Did you find this this already?

It's comparatively simple. A request message carries a number of
segments, each segment a range of sectors (up to 8 x 512 == 4096, i.e. a
page size, therefore the format).

The type of operation is either read or write, encoded in the request.

Daniel

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Daniel Stodden
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