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 two new tests. overlay/075 tests immutable/append-only lower files and directories - the test fails on upstream kernel. Fixing this requires some VFS API changes that Miklos has proposed [1]. overlay/076 is a "dangerous" test that triggers a deadlock. The deadlock was fixed in master and in stable kernel v5.10.15. Thanks, Amir. Changes since v1: - Split the dangerous test - Document fix commit - Fix Eryu's minor review comments on t_immutable [1] https://lore.kernel.org/linux-fsdevel/20210203124112.1182614-1-mszeredi@xxxxxxxxxx/ Amir Goldstein (5): 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 overlay: Regression test for deadlock on directory ioctl src/t_immutable.c | 241 +++++++++++++++++++++--------------------- tests/overlay/030 | 7 +- tests/overlay/075 | 92 ++++++++++++++++ tests/overlay/075.out | 11 ++ tests/overlay/076 | 66 ++++++++++++ tests/overlay/076.out | 2 + tests/overlay/group | 2 + 7 files changed, 301 insertions(+), 120 deletions(-) create mode 100755 tests/overlay/075 create mode 100644 tests/overlay/075.out create mode 100644 tests/overlay/076 create mode 100644 tests/overlay/076.out -- 2.25.1
