Eryu, Overlayfs never had full support for immutable/append-only files. Whatever works is covered by generic/079 and overlay/030 tests. Both tests cover only upper files and directories. generic/079 is notrun on kernel < 5.10 and passes on >= 5.10. This series improves the t_immutable test program and adds a new test to cover lower files and directories - the test fails on upstream kernel. Fixing this requires some VFS API changes that Miklos has proposed [1]. The new test covers two reported bug, one of them is a deadlock. The deadlock trigger is commented out until we have a fix upstream. Thanks, Amir. [1] https://lore.kernel.org/linux-unionfs/20201123141207.GC327006@xxxxxxxxxxxxxxxxxxxxxxxxx/ Amir Goldstein (4): overlay/030: Update comment w.r.t upstream kernel src/t_immutable: factor out some helpers src/t_immutable: Allow setting flags on existing files overlay: Test lost immutable/append-only flags on copy-up src/t_immutable.c | 241 +++++++++++++++++++++--------------------- tests/overlay/030 | 7 +- tests/overlay/075 | 97 +++++++++++++++++ tests/overlay/075.out | 11 ++ tests/overlay/group | 1 + 5 files changed, 237 insertions(+), 120 deletions(-) create mode 100755 tests/overlay/075 create mode 100644 tests/overlay/075.out -- 2.25.1
