"relaxed" `-hda file.qcow2` equivalent ?

[lacsaP Patatetom]

hi,
what is the "relaxed" equivalent of the `-hda file.qcow2` command line
argument to control file locking (`locking=off`) ?
the documentation says that `-hda a` can be replaced by `-drive file=a` and
that locking can be controlled with the `locking` option of the `blockdev`
argument : how to link `drive` and `blockdev` to obtain "relaxed" `-hda
file.qcow2` ?
regards, lacsaP.