[PATCH] xen/blkback: update sysfs interface documentation

[Aishwarya Pant]

Add documentation for statistic attribute ds_req - the number of
discarded requests.

Signed-off-by: Aishwarya Pant <aishpant@xxxxxxxxx>
---
 Documentation/ABI/stable/sysfs-bus-xen-backend | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/ABI/stable/sysfs-bus-xen-backend b/Documentation/ABI/stable/sysfs-bus-xen-backend
index 3d5951c8bf5f..20ef835785ec 100644
--- a/Documentation/ABI/stable/sysfs-bus-xen-backend
+++ b/Documentation/ABI/stable/sysfs-bus-xen-backend
@@ -73,3 +73,10 @@ KernelVersion:	3.0
 Contact:	Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
 Description:
                 Number of sectors written by the frontend.
+
+What:		/sys/bus/xen-backend/devices/vbd-*/statistics/ds_req
+Date:		October 2011
+KernelVersion:	3.1
+Contact:	Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
+Description:
+                Number of discard requests from the frontend.
-- 
2.16.1