struct dmabuf_cmsg {
__u64 frag_offset; /* offset into the dmabuf where the frag starts.
*/
__u32 frag_size; /* size of the frag. */
__u32 frag_token; /* token representing this frag for *DEVMEM_DONTNEED.
*/
__u32 dmabuf_id; /* dmabuf id this frag belongs to. */
__u32 flags; /* Currently unused. Reserved for future *uses.
*/
};