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Proof step 22 from proof read-loop-err (previous step)

VFS_PAGE_SIZE = n0 + (ino2 + ino0) % VFS_PAGE_SIZE, buf = mkbuf(VFS_PAGE_SIZE), err = ESUCCESS, err0 = ESUCCESS, inode = mkinode(m, md, boolvar, m0, m1, m2), pageno = (ino2 + ino0) / VFS_PAGE_SIZE, ino2 + ino0 < m2, ino2 + ino0 < ino1, pre-readpage(inode, pageno, buf, dirs, files) ⊦ [buf0 := copy(zeropage, (ino2 + ino0) % VFS_PAGE_SIZE, buf0, ino0, min(ino1 - ino2 + ino0, n0, m2 - ino2 + ino0)); ino3 := ino0 + min(ino1 - ino2 + ino0, n0, m2 - ino2 + ino0)] (⌊err⌋ ∨ err = ESUCCESS), VFS_PAGE_SIZE = 0, ino1 = ino2 + ino0, m2 = ino2 + ino0, n0 = 0, pageno ∈ files[inode.ino].content

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

Additional information

Used simplifier rules: ⊦ VFS_PAGE_SIZE ≠ 0; (s)% ⊦ n ≥ m ↔ m ≤ n; (s)% ⊦ m < n → m ≤ n; (s)% ⊦ # zeropage = VFS_PAGE_SIZE; (s)%⊦ pre-readpage(inode, n, buf, dirs, files) ↔ valid-file-ino(inode.ino, dirs, files) ∧ # buf = VFS_PAGE_SIZE; (s)% ⊦ mkinode(m, md, boolvar, m0, m1, m2).ino = m; (s)% ⊦ valid-file-ino(ino, dirs, files) ↔ ino ∈ files; (s)% ⊦ # mkbuf(n) = n; (s)% ⊦ ¬ ⌊ESUCCESS⌋ ; (s)