The Linux Kernel Device Mapper header files The Linux Kernel Device Mapper is the LVM (Linux Logical Volume Management) Team's implementation of a minimalistic kernel-space driver that handles volume management, while keeping knowledge of the underlying device layout in user-space. This makes it useful for not only LVM, but EVMS, software raid, and other drivers that create "virtual" block devices. This package contains the (user-space) header files for accessing the device-mapper; it allow usage of the device-mapper through a clean, consistent interface (as opposed to through kernel ioctls).