How to use device mapper in Android(dmsetup cannot be found)

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http://stackoverflow.com – I am trying to use device mapper in Android, but still stuck on the command "dmsetup" didn't found in Android. I have loaded the linear.ko and zero.ko which are target device classes successfully in my Android device, but cannot create a virtual device by device mapper because "dmsetup" cannot be found. If anyone know how to get one for Android or have any other methods to create a virtual device? By the way, I saw a file "device-mapper" in /dev folder, what is used for? I am really appreciate who can help me on this. BR, -Wenji (HowTos)