EXT4 Prepared To Switch To Linux's New Mount API
Linux's new mount API is what came about in recent times as a set of system calls offering more flexibility than the long-standing mount syscall that is a one-shot effort while this new multi-step mounting procedure allows for more options. Below is a presentation by Canonical's Christian Brauner from last year's Open-Source Summit around the new mount API.
The modern mount API is documented here for those interested in all the details.
Over a span of patches now in EXT4 dev, EXT4 has transitioned to the mount API. This code in turn will appear in the Linux 5.17 cycle next year.