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Theorem pre-rename-new-keep-parent

⊦ pre-rename-new-keep-parent(parent_inode, old_dent, old_child_inode, new_dent, fs, ri, ro) ↔ ( valid-negdentry(parent_inode.ino, new_dent, fs, ri, ro) ∧ valid-dentry(parent_inode.ino, old_dent, fs, ri, ro) ∧ valid-dir-inode(parent_inode, fs, ri) ∧ valid-wb-inode(old_child_inode, fs, ri) ∧ old_child_inode.ino = old_dent.ino) ∧ parent_inode.size ≥ 1 ∧ (old_child_inode.directory → parent_inode.nsubdirs ≥ 1)