Thin provisioning target

modulename: dm-thin-pool.ko

configname: CONFIG_DM_THIN_PROVISIONING

Linux Kernel Configuration
└─>Device Drivers
└─>Multiple devices driver support (RAID and LVM)
└─>Thin provisioning target
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Provides thin provisioning and snapshots that share a data store.

source code: