On Mon, Jan 18, 2021 at 11:57:10AM -0800, Darrick J. Wong wrote:

Where should I add a sysfs attributes for per-fs configuration knobs?  I
don't really want to add "expected parallelism" to /sys/fs/xfs/*/error
because that seems like the wrong place, and /proc/sys/fs/xfs/ is too
global for something that could depend on the device.

Maybe a mount option that can be changed using remount?