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..point to? Especially after removing the hard link to this directory, in the directory pointed to by..? It needs to point somewhere...doesn't need to physically exist on any drive. It's the operating system's job to keep track of the current working directory, anyway, so it should be relatively simple to also keep a list of inodes associated with each process' cwd and refer to that when it sees a use of... Of course, that would mean symlinks would need to be created with that in mind, but you already have to be careful not to break symlinks, and I don't think that additional rule would render them useless.