selftests/filesystems: test that a mntns file can't take over a lock

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Add a case to the locked mount test:

- a bind of the mount namespace file of a grandchild moved beneath a
  locked cover must fail with EINVAL
- a bind of an ordinary file beneath it takes the lock over, the old
  cover can go and the new one can't
- the file is still covered after unshare(CLONE_NEWNS)

Link: https://patch.msgid.link/20261014-work-namei-locked-mnt_ns_file-v1-2-24035bd5d8e9@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-10-14 21:45:14 +02:00

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tools/testing/selftests/filesystems/umount_propagation/locked_mount_test.c

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