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Theorem pre-unlink

⊦ pre-unlink(p_inode, c_inode, dent, fs, ri, ro) ↔ dent.ino ≠ ROOT_INO ∧ valid-dentry(p_inode.ino, dent, fs, ri, ro) ∧ ¬ inodekey(dent.ino) ∈ ro ∧ fs[ri[inodekey(dent.ino)]].nlink ≠ 0 ∧ (fs[ri[inodekey(dent.ino)]].nlink = 1 → links(dent.ino, fs, ri) = {dentrykey(p_inode.ino, dent.name)} ) ∧ valid-dir-inode(p_inode, fs, ri) ∧ valid-file-inode(c_inode, fs, ri) ∧ c_inode.ino = dent.ino ∧ p_inode.size ≥ 1