xen: document backend sysfs files

Add ABI documentation for the /sys/bus/xen-backend sysfs files,
including those specific to blkback devices.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/Documentation/ABI/stable/sysfs-bus-xen-backend b/Documentation/ABI/stable/sysfs-bus-xen-backend
new file mode 100644 (file)
index 0000000..3d5951c
--- /dev/null
+++ b/Documentation/ABI/stable/sysfs-bus-xen-backend
@@ -0,0 +1,75 @@
+What:          /sys/bus/xen-backend/devices/*/devtype
+Date:          Feb 2009
+KernelVersion: 2.6.38
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                The type of the device.  e.g., one of: 'vbd' (block),
+                'vif' (network), or 'vfb' (framebuffer).
+
+What:          /sys/bus/xen-backend/devices/*/nodename
+Date:          Feb 2009
+KernelVersion: 2.6.38
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                XenStore node (under /local/domain/NNN/) for this
+                backend device.
+
+What:          /sys/bus/xen-backend/devices/vbd-*/physical_device
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                The major:minor number (in hexidecimal) of the
+                physical device providing the storage for this backend
+                block device.
+
+What:          /sys/bus/xen-backend/devices/vbd-*/mode
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                Whether the block device is read-only ('r') or
+                read-write ('w').
+
+What:          /sys/bus/xen-backend/devices/vbd-*/statistics/f_req
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                Number of flush requests from the frontend.
+
+What:          /sys/bus/xen-backend/devices/vbd-*/statistics/oo_req
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                Number of requests delayed because the backend was too
+                busy processing previous requests.
+
+What:          /sys/bus/xen-backend/devices/vbd-*/statistics/rd_req
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                Number of read requests from the frontend.
+
+What:          /sys/bus/xen-backend/devices/vbd-*/statistics/rd_sect
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                Number of sectors read by the frontend.
+
+What:          /sys/bus/xen-backend/devices/vbd-*/statistics/wr_req
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                Number of write requests from the frontend.
+
+What:          /sys/bus/xen-backend/devices/vbd-*/statistics/wr_sect
+Date:          April 2011
+KernelVersion: 3.0
+Contact:       Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
+Description:
+                Number of sectors written by the frontend.