Layout Intent
^^^^^^^^^^^^^
[[struct-layout-intent]]

An LDLM_ENQUEUE RPC with a layout intent uses the 'layout_intent'
structure to specify the desired use for the layout.

----
struct layout_intent {
	__u32 li_opc;
	__u32 li_flags;
	__u64 li_start;
	__u64 li_end;
};
----

The uses for the layout that the 'li_opc' field can specify are:

----
enum {
        LAYOUT_INTENT_ACCESS    = 0,
        LAYOUT_INTENT_READ      = 1,
        LAYOUT_INTENT_WRITE     = 2,
        LAYOUT_INTENT_GLIMPSE   = 3,
        LAYOUT_INTENT_TRUNC     = 4,
        LAYOUT_INTENT_RELEASE   = 5,
        LAYOUT_INTENT_RESTORE   = 6
};
----

The other fields - li_flags, li_start, adn li_end - are reserved for
future use, but do not currently play arole.