I ran all kernel selftests on some test machine, and stumbled upon
cachestat failing (among others).
These patches fix the run on older kernels and when the current
directory is on a tmpfs instance.

I dropped the first two fix patches from v1, since Shuah applied those
already. [PATCH v2 1/2] is almost the same as [PATCH 3/3] from v1, but
using the proper skip function from kselftest.h. I am not sure if Shuah
applied that already, if yes, it's not a big problem, the output is the
same.

Patch 2/2 implements the tmpfs detection that Nhat suggested the last
time (many thanks for pointing me to statfs and the magics!).

Cheers,
Andre

Andre Przywara (2):
  selftests: cachestat: test for cachestat availability
  selftests: cachestat: catch failing fsync test on tmpfs

 .../selftests/cachestat/test_cachestat.c      | 80 +++++++++++++++----
 1 file changed, 65 insertions(+), 15 deletions(-)

-- 
2.25.1