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+What: /sys/block/dm-<num>/dm/name
+Date: January 2009
+KernelVersion: 2.6.29
+Description: Device-mapper device name.
+ Read-only string containing mapped device name.
+Users: util-linux, device-mapper udev rules
+What: /sys/block/dm-<num>/dm/uuid
+Date: January 2009
+KernelVersion: 2.6.29
+Description: Device-mapper device UUID.
+ Read-only string containing DM-UUID or empty string
+ if DM-UUID is not set.
+Users: util-linux, device-mapper udev rules
+What: /sys/block/dm-<num>/dm/suspended
+Date: June 2009
+KernelVersion: 2.6.31
+Description: Device-mapper device suspend state.
+ Contains the value 1 while the device is suspended.
+ Otherwise it contains 0. Read-only attribute.
+Users: util-linux, device-mapper udev rules