> > Christian, > > > > Do you know any userspace that already uses your new append prefixes? > > Do we have any good reason to support "lowerdir_first" > > so a lower dir stack could be reset before creating the sb? > > If that is a requirement, I suggest extending fsconfig(2) to allow > resetting an option. Overlayfs does already support this. If you pass: fsconfig(FSCONFIG_SET_STRING, "lowerdir", "", ...) then the lower layer stack is reset. I've implemented it that way in ovl_parse_param_lowerdir(). > > > > > > > > > > > > > Anyway, let's focus on what you would like best. > > > > > > If you prefer to just fix the regression, it is doable. > > > > > > If you prefer the upperdirfd, workdirfd, lowerdirfd API, I think we can > > > > > > find a volunteer to write it up. > > Can't the existing option names be overloaded if a separate cmd > (FSCONFIG_SET_PATH or FSCONFIG_SET_PATH_EMPTY) is used in fsconfig()? Yes, they can and filesystems do do that today depending on whether they want to e.g., take an fd or a path or something.
