laptop-kernel/tools/testing/selftests/filesystems/mntns_unbindable, branch masterLinux kernel tree for laptophttps://git.zx2c4.com/laptop-kernel/atom/tools/testing/selftests/filesystems/mntns_unbindable?h=master2026-09-25T15:20:32Zselftests/filesystems: check that a copied mount namespace keeps unbindable2026-09-25T15:20:32ZChristian Braunerbrauner@kernel.org2026-09-23T12:27:54Zurn:sha1:0bab6b6d77607458a25710a42c42ae2343468d2c
Make a tmpfs unbindable, copy the mount namespace and check from the
copy that:
- a bind of the mount fails with EINVAL
- a recursive bind fails as well
- open_tree(OPEN_TREE_CLONE) of it fails
- mountinfo still shows it as unbindable
- a copy of the copy refuses the bind too
The first case runs in the original namespace so the fixture stays
honest about what it set up.
Link: https://patch.msgid.link/20260923-work-mount-fixes-v1-2-f424cf8d3242@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>