fs/dlm/Kconfig v3.0-rc7

DLM

Distributed Lock Manager (DLM)

A general purpose distributed lock manager for kernel or userspace
applications.

DLM_DEBUG

DLM debugging

Under the debugfs mount point, the name of each lockspace will
appear as a file in the "dlm" directory.  The output is the
list of resource and locks the local node knows about.