使用linux中的索引编制文件搜索算法

I think of implementing a file search program using indexing in linux... I know that there are several other file search programs like beagled. but I am doing this for study purpose... I am struck with how to do indexing.. I have the following idea that I took from maemo-mapper application.. for example if u have file named "suresh" its index in the file system as files...I think of implementing a file search program u