OCFS2/DLM/dlm query join response code

enum dlm_query_join_response_code {
        JOIN_DISALLOW = 0,
        JOIN_OK,
        JOIN_OK_NO_MAP,
        JOIN_PROTOCOL_MISMATCH,
};

struct dlm_query_join_packet {
        u8 code;        /* Response code.  dlm_minor and fs_minor
                           are only valid if this is JOIN_OK */
        u8 dlm_minor;   /* The minor version of the protocol the
                           dlm is speaking. */
        u8 fs_minor;    /* The minor version of the protocol the
                           filesystem is speaking. */
        u8 reserved;
};

union dlm_query_join_response {
        u32 intval;
        struct dlm_query_join_packet packet;
};