Device mapper support

modulename: dm-mod.ko

configname: CONFIG_BLK_DEV_DM

Linux Kernel Configuration
└─>Device Drivers
└─>Multiple devices driver support (RAID and LVM)
└─>Device mapper support
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Device-mapper is a low level volume manager. It works by allowing
people to specify mappings for ranges of logical sectors. Various
mapping types are available, in addition people may write their own
modules containing custom mappings if they wish.

Higher level volume managers such as LVM2 use this driver.

To compile this as a module, choose M here: the module will be
called dm-mod.

If unsure, say N.

source code: