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Fix is_device_mapper() predicate to not base on checking a hardcoded major number (253), which not always correct, since on some systems dm-devices have different majors". Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>