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xen-devel
Re: [Xen-devel] Virtual File System in XEN
On Thu, Sep 22, 2011 at 03:31:04PM +0530, Nupur Ghatnekar wrote:
> We are an undergraduate group of students. For our final year project, we
> are planning to implement a Virtual File System in XEN.
>
>
> In a paravirtualised environment, an Userspace Application makes a system
> call for access to a file, the domU’s kernel traps it and converts it to an
> appropriate block number. Now this block number is on the Virtual Hard Disk.
> The blktap mechanism is used for block I/O. It involves using XenBus and a
The blktap is deprecated for the upstream kernel - so it won't help you much.
You might be better of using the QEMU backends, like qcow or such.
> daemon in user space of Dom0 which with help of libaio fires the request on
> Dom0 File System. The current scenario involves multiple translations for
> getting the actual physical address.
>
>
> Our project intends to reduce the number of translations required during the
> fetching or satisfying of the request.
>
> The DomU kernel doesn’t convert the FS request to block and passes on this
> to dom0 using a client-server mechanism.
>
>
> We intend to implement it using the 9P protocol.\
>
> 1) The domU kernel’s filesystem component will be a client and the dom0 will
> be the server.
>
> 2) The domU’s kernel will send the file request to dom0 using the 9P
> protocol rather than converting it to appropriate block no.
>
> 3) The server in dom0 will authenticate the request, process it and send the
> appropriate replies.
>
>
> By having a virtual file system, the hypervisor will have a better
> understanding of what the guest domains are doing and hence this can help in
> taking intelligent decisions and thereby have better results in caching,
> de-duplication and snapshots.
>
> Any suggestions for our proposed project would be appreciated.
> --
>
> Nupur Ghatnekar
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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