selftests/filesystems: check that OPEN_TREE_NAMESPACE keeps mounts covered

Add a test for open_tree(OPEN_TREE_NAMESPACE) from a user namespace that
doesn't own the mount namespace it copies from:

-

selftests/filesystems: check that OPEN_TREE_NAMESPACE keeps mounts covered

Add a test for open_tree(OPEN_TREE_NAMESPACE) from a user namespace that
doesn't own the mount namespace it copies from:

- a file covered by a private or an unbindable tmpfs mount
- the non-recursive copy of the parent mount fails with EINVAL
- the recursive copy keeps the file covered in the new mount namespace
- the owner of the mount namespace keeps the bind mount semantics

Link: https://patch.msgid.link/20260930-work-mount-fixes-3-v1-7-be34c83956ae@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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selftests: add FSMOUNT_NAMESPACE tests

Add selftests for FSMOUNT_NAMESPACE which creates a new mount namespace
with the newly created filesystem mounted onto a copy of the real
rootfs.

Link: https:

selftests: add FSMOUNT_NAMESPACE tests

Add selftests for FSMOUNT_NAMESPACE which creates a new mount namespace
with the newly created filesystem mounted onto a copy of the real
rootfs.

Link: https://patch.msgid.link/20260122-work-fsmount-namespace-v1-6-5ef0a886e646@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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selftests/open_tree: add OPEN_TREE_NAMESPACE tests

Add tests for OPEN_TREE_NAMESPACE.

Link: https://patch.msgid.link/20251229-work-empty-namespace-v1-2-bfb24c7b061f@kernel.org
Tested-by: Jeff Layto

selftests/open_tree: add OPEN_TREE_NAMESPACE tests

Add tests for OPEN_TREE_NAMESPACE.

Link: https://patch.msgid.link/20251229-work-empty-namespace-v1-2-bfb24c7b061f@kernel.org
Tested-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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