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This is accomplished by reading associated sysfs information. For a dm device, this is /sys/dev/block/major:minor/dm/name (supported in kernel version >= 2.6.29, for older kernels, the behaviour is the same as for non-dm devices). For a non-dm device, this is a readlink on /sys/dev/block/major:minor, e.g. /sys/dev/block/253:0 --> ../../devices/virtual/block/dm-0. The last component of the path is a proper kernel name (block device name). One can request to read only kernel names by setting the 'prefer_kernel_name' argument if needed.