Christian Brauner [off-list ref] writes:

quoted

Why use struct __mount_arg (or struct mnt_id_req :) here rather than
just passing in the mount ID directly?  You don't use the request_mask

Please see Arnd's detailed summary here:
https://lore.kernel.org/lkml/44631c05-6b8a-42dc-b37e-df6776baa5d4@app.fastmail.com (local)

Ah, makes sense, I'd missed that.

Given this, though, it seems like maybe sys_listmount() should enforce
that req->request_mask==0 ?

Thanks,

jon