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+What:		/sys/bus/rbd/
+Date:		November 2010
+Contact:	Yehuda Sadeh <yehuda@newdream.net>,
+		Sage Weil <sage@newdream.net>
+Description:
+
+Being used for adding and removing rbd block devices.
+
+Usage: <mon ip addr> <options> <pool name> <rbd image name> [snap name]
+
+ $ echo "192.168.0.1 name=admin rbd foo" > /sys/bus/rbd/add
+
+The snapshot name can be "-" or omitted to map the image read/write. A <dev-id>
+will be assigned for any registered block device. If snapshot is used, it will
+be mapped read-only.
+
+Removal of a device:
+
+  $ echo <dev-id> > /sys/bus/rbd/remove
+
+Entries under /sys/bus/rbd/devices/<dev-id>/
+--------------------------------------------
+
+client_id
+
+	The ceph unique client id that was assigned for this specific session.
+
+features
+
+	A hexadecimal encoding of the feature bits for this image.
+
+major
+
+	The block device major number.
+
+name
+
+	The name of the rbd image.
+
+image_id
+
+	The unique id for the rbd image.  (For rbd image format 1
+	this is empty.)
+
+pool
+
+	The name of the storage pool where this rbd image resides.
+	An rbd image name is unique within its pool.
+
+pool_id
+
+	The unique identifier for the rbd image's pool.  This is
+	a permanent attribute of the pool.  A pool's id will never
+	change.
+
+size
+
+	The size (in bytes) of the mapped block device.
+
+refresh
+
+	Writing to this file will reread the image header data and set
+	all relevant datastructures accordingly.
+
+current_snap
+
+	The current snapshot for which the device is mapped.
+
+snap_*
+
+	A directory per each snapshot
+
+parent
+
+	Information identifying the pool, image, and snapshot id for
+	the parent image in a layered rbd image (format 2 only).
+
+Entries under /sys/bus/rbd/devices/<dev-id>/snap_<snap-name>
+-------------------------------------------------------------
+
+snap_id
+
+	The rados internal snapshot id assigned for this snapshot
+
+snap_size
+
+	The size of the image when this snapshot was taken.
+
+snap_features
+
+	A hexadecimal encoding of the feature bits for this snapshot.
+