selftests/filesystems: check that the nullfs root can't be reconfigured

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Add a test for the root of an empty mount namespace:

- fspick() of the root fails with EINVAL
- mount(MS_REMOUNT) of the root fails with EINVAL
- umount() of the root fails and doesn't remount it read-only

Link: https://patch.msgid.link/20260930-work-mount-fixes-3-v1-12-be34c83956ae@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-09-30 15:32:04 +02:00

parent d791606bb9

commit 5e83e3a38b

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1

tools/testing/selftests/filesystems/empty_mntns/.gitignore vendored

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2

tools/testing/selftests/filesystems/empty_mntns/Makefile

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108

tools/testing/selftests/filesystems/empty_mntns/internal_sb_reconfigure_test.c

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