Lustre Handle
^^^^^^^^^^^^^
[[struct-lustre-handle]]

A 'lustre_handle' is an opaque cookie that identifies some local object
to another node or another layer in the software stack.  It is not the
physical address of the data structure in memory to avoid memory
corruption in case the object has been freed, but rather a cookie in a
lookup table that provides a layer of indirection that can safely
determine if the object still exists or not.

A 'lustre_handle' can identify a variety of different types of objects,
such as client-target connections, open file handles, DLM lock handles,
etc.  The meaning of the handle is dependent on the context in which it
is used.

----
struct lustre_handle {
        __u64 cookie;
};
----