generic: add test for tmpfs POSIX ACLs

Add a regression test for commit 705191b03d50 ("fs: fix acl translation").
This tests whether setting POSIX ACLs on a tmpfs mounted in a
non-initial user and mount namespace works as expected.

Note, once again the idmapped mount testsuite is grossly misnamed at
this point. It has morphed into a full-blown generic vfs feature

Cc: Eryu Guan <>
Cc: Seth Forshee <>
Cc: Christoph Hellwig <>
Cc: Zorro Lang <>
Cc: Linus Torvalds <>
Signed-off-by: Christian Brauner (Microsoft) <>
Reviewed-by: Zorro Lang <>
Signed-off-by: Zorro Lang <>
3 files changed