Add missing long options and --help output.
Reorder options for consistency.
Use -b for --backing, and recognize -B for backwards
compatibility. Unfortunately we can't use -B to
specify backing format.
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-ID: <20250715140702.131321-1-mjt@tls.msk.ru>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>