GFS2 DLM locking module

modulename: lock_dlm.ko

configname: CONFIG_GFS2_FS_LOCKING_DLM

Linux Kernel Configuration
└─>File systems
└─>GFS2 DLM locking module
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Multiple node locking module for GFS2

Most users of GFS2 will require this module. It provides the locking
interface between GFS2 and the DLM, which is required to use GFS2
in a cluster environment.

source code: