On Mon, Mar 15, 2021 at 10:37:12AM -0700, Harshad Shirwadkar wrote:

Before this patch, the function parse_options() was returning
journal_devnum and journal_ioprio variables to the caller. This patch
generalizes that interface to allow parse_options to return any parsed
options to return back to the caller. In this patch series, it gets
used to capture the value of "mb_optimize_scan=%u" mount option.

Instead of adding more code to the legacy option parsing code can
someone convert ext4 to the new mount API first?