selftests/filesystems: check that a busy propagated copy blocks a synchronous umount

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A slave namespace moves an open_tree() copy of the shared tree beneath
the propagated copy of the victim and keeps the descriptor. Check that:

- umount(2) of the victim fails with EBUSY while the descriptor is open

- the moved tree is still attached in the slave namespace afterwards

- the umount succeeds once the descriptor is closed

The test needs CAP_SYS_ADMIN and skips otherwise.

Link: https://patch.msgid.link/20260923-work-mount-fixes-v1-6-f424cf8d3242@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-09-23 14:27:58 +02:00

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tools/testing/selftests/Makefile

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6

tools/testing/selftests/filesystems/umount_propagation/Makefile

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226

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

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