| ⊦ inodekey(ino) ∈ ri ∧ ino ≠ 0 ∧ fs[ri[inodekey(ino)]].directory → abs-dirs(fs, ri -- dentrykey(ino, str)) = abs-dirs(fs, ri) [ino, mkdir (fs[ri[inodekey(ino)]].size, fs[ri[inodekey(ino)]].meta, fs[ri[inodekey(ino)]].nlink, fs[ri[inodekey(ino)]].nsubdirs, abs-children(ino, fs, ri) -- str) ] |