xen: add virtual block device driver.

The block device frontend driver allows the kernel to access block
devices exported exported by a virtual machine containing a physical
block device driver.

Signed-off-by: Ian Pratt <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Greg KH <greg@kroah.com>
Cc: Jens Axboe <axboe@kernel.dk>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/major.h b/include/linux/major.h
index 7e7c9093919a..0cb98053537a 100644
--- a/include/linux/major.h
+++ b/include/linux/major.h
@@ -158,6 +158,8 @@
 #define VXSPEC_MAJOR            200     /* VERITAS volume config driver */
 #define VXDMP_MAJOR             201     /* VERITAS volume multipath driver */
 
+#define XENVBD_MAJOR            202     /* Xen virtual block device */
+
 #define MSR_MAJOR               202
 #define CPUID_MAJOR             203