A stateless file system does not create a ``wrapping'' vnode
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This file system type is quite limited. The only time that something interesting can happen is when the file system's mount point is crossed. I expect very few useful file systems to fall into this category. An example is Crossfs (Appendix sec-appendix-typical-stateless-crossfs), a file system that performs a stateless event when a lookup operation traverses into it from the file system it is mounted on. A typical event might be to print a message on the system console that includes the uid and gid of process that crossed into this file system.