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xen-devel
Re: [Xen-devel] [PATCH] Add an ioctl interface for simple xenstore acces
Muli Ben-Yehuda wrote:
On Fri, Mar 17, 2006 at 02:33:36PM -0800, Dan Smith wrote:
This patch adds an ioctl interface to /proc/xen/xenbus to allow simple
access to xenstore from domU. This patch introduces only
xenbus_read() support, but write, remove, etc could be easily added.
Also, this interface can be easily moved to /dev/xen/xenbus (or
something similar) later.
Hmm, wouldn't a virtual file system be a much better fit for xenstore
access? the kernel community considers ioctls Evil with a capital E.
I'm not sure how one would express the transaction semantics of xenstore
via a virtual filesystem. There is also an awkward mapping between some
of the attributes of xenstore (for instance, there's no way to determine
if an attribute returned by a list is a directory or not) that makes a
filesystem non-trivial.
If you remember, I had written a fuse filesystem front-end for xenstore
at one point. It's definitely neat, but I think we would have to make
some changes to Xenstore for it to really work out well.
Regards,
Anthony Liguori
Cheers,
Muli
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