Constructors of classes inherited from file_impl copy alignment values by hands, but miss the overwrite one, thus on a new file it remains default-initialized. To fix this and not to forget to properly initalize future fields from file_impl, use the impl's copy constructor. tests: unit(dev) Signed-off-by: Pavel Emelyanov <xemul@scylladb.com> Message-Id: <20210325104830.31923-1-xemul@scylladb.com>