Hi Christian, It's been 3 month past, since your patch [1] was reviewed last time. I'm still waititng for this test coverage for fs. According to the review points last time, I split your v3 patch [1] to 2 separated cases, one basic testing for covering that fix, one extend testing for overlay part. I only did below changes (compare with v3): 1) Split one case to two cases. 2) Move "_supports_filetype" line under the _scratch_mount. I still keep the patch Author as you, and signed-off-by you, due to I just hope to bring this discussion back, and push the proceeding of this patch be merged. (CC the old cc list to get more review) Thanks, Zorro [1] https://lore.kernel.org/fstests/20220615092826.2333847-1-brauner@xxxxxxxxxx/