Re: Disk naming (Was Re: [Xen-devel] [PATCH] Guest boot loadersupport [1/2])

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Adam Heath wrote:

> It does.  So, it's the blkback in dom0 that requires a device node.  How about
> it the blkback were extended to support files in filesystems?
>  
I think the hardest thing to deal with is the fact that the control 
messages are limited to 60 bytes meaning that if you changed the 
be_vbd_create message to pass file names instead of device types you'd 
have to support continuations to suport filenames that are > ~40 bytes long.
The registry will make this a lot easier since the blkif_be device could 
just read a filename out of the registry.  I've thought about changing 
the blkif_be driver to be able to access the file ops directly before 
and this has been the limiting factor in my mind (unless someone else 
has a more creative solution :-)).
Regards,
Anthony Liguori

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