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2026-10-12selftests/filesystems: test OPEN_TREE_DROP_MNTNS_MOUNTSKir Kolyshkin
Pin a mount namespace below a tmpfs mount, the way snapd does under /run/snapd/ns, and attach a recursive clone of that tmpfs inside a younger mount namespace created with OPEN_TREE_NAMESPACE. Without OPEN_TREE_DROP_MNTNS_MOUNTS move_mount(2) fails with ELOOP; with it, it succeeds. Also check that the flag is rejected without OPEN_TREE_CLONE or OPEN_TREE_NAMESPACE, and accepted with the latter. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com> Link: https://patch.msgid.link/20261006-nsfs-prune-rfc-v3-2-adb97ea52868@gmail.com Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
2026-10-01selftests/filesystems: check that OPEN_TREE_NAMESPACE keeps mounts coveredChristian Brauner
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>
2026-03-12selftests: add FSMOUNT_NAMESPACE testsChristian Brauner
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>
2026-03-12selftests/statmount: add statmount_alloc() helperChristian Brauner
Add a helper to allocate a statmount buffer and call statmount(). This helper will be shared by multiple test suites that need to query mount information via statmount(). Link: https://patch.msgid.link/20260122-work-fsmount-namespace-v1-5-5ef0a886e646@kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org>
2026-01-16selftests/open_tree: add OPEN_TREE_NAMESPACE testsChristian Brauner
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>