to #26323588

commit d7f62e825fd19202a0749d10fb439714c51f67d2 upstream.

With nesting of anonymous unions and structs it's hard to
review layout changes. It's better to ask the compiler
for these things.
Signed-off-by: NStefan Metzmacher <metze@samba.org>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>