.Lustre Capability
[[struct-lustre-capa]]
****
The so-called "capabilities" structure is deprecated in recent
versions of Lustre, and commonly appears in the packet header as a zero
length buffer. It conveys security capabilities. See <<security>>.
----
struct lustre_capa {
        struct lu_fid   lc_fid;         /** fid */
        __u64           lc_opc;         /** operations allowed */
        __u64           lc_uid;         /** file owner */
        __u64           lc_gid;         /** file group */
        __u32           lc_flags;       /** HMAC algorithm & flags */
        __u32           lc_keyid;       /** key# used for the capability */
        __u32           lc_timeout;     /** capa timeout value (sec) */
        __u32           lc_expiry;      /** expiry time (sec) */
        __u8            lc_hmac[CAPA_HMAC_MAX_LEN];   /** HMAC */
};
----
****