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Proof step 233 from proof refine-unlink (previous step)

# entries = dirs0[ino1].size, # links(ino1, dirs0) = dirs0[ino1].nlink, # links(entries[str], dirs0) = files[entries[str]].nlink, # entries = m0 + 1, entries[str] = dirs0[ino1].entries[str], files[entries[str]] = mkfile(m, md0, files[entries[str]].nlink, content), dirs0[ino1] = mkdir(# entries, md, dirs0[ino1].nlink, dirs0[ino1].nsubdirs, entries), fs = abs-files(files), root[q].dir?, root.dir?, dom of < ino0, abs(root, ROOT_INO)(dirs0), afs-cons(dirs0, files), fids-cons(root, abs-files(files), abs-of(of)), ispath(q, ROOT_INO, ino1, dirs0, files), of-cons(of, dirs0, files), pw(user, md), px(user, md), px-parent(user, q, ROOT_INO, dirs0, files), str ∈ dirs0[ino1].entries, entries[str] ∈ files, ino1 ∈ dirs0, str ∈ entries, dirs ≡ dirs0[ino1, (dirs0[ino1].entries:= (dirs0[ino1].entries -- str)).size:= m0], 1 ≤ # entries, psynced → asynced0, links(ino1, dirs0) ≠ ∅ ∨ ino1 = ROOT_INO ⊦ [afs_drop_nlink#(mkdentry(str, entries[str]).ino; dirs, files); dent := negdentry(mkdentry(str, entries[str]).name); afs_inode_sync#(mkinode(ino1, md, true, dirs0[ino1].nlink, dirs0[ino1].nsubdirs, # entries); dirs, files); afs_inode_sync#(mkinode(entries[str], md0, false, # links(entries[str], dirs0), 0, m); dirs, files); inode := (ino1 ∈ dirs ⊃ mkinode(ino1, dirs[ino1].meta, true, dirs[ino1].nlink, dirs[ino1].nsubdirs, dirs[ino1].size) ;mkinode(ino1, files[ino1].meta, false, files[ino1].nlink, 0, files[ino1].size) ); c_inode := getinode(entries[str], dirs, files); err := ESUCCESS; asynced := ?; vfs_put_inode#(c_inode, of, asynced; err, dirs, files)] ( of-cons(of, dirs, files) ∧ afs-cons(dirs, files) → ⟨posix_unlink#(q + str ', user, abs-of(of); err1, root, fs; psynced)⟩ (fs = abs-files(files) ∧ abs(root, ROOT_INO)(dirs) ∧ (psynced → asynced) ∧ err = err1)), # entries = 0, entries = ∅, root[q + str '].dir?, entries[str] ∈ dirs, entries[str] ∈ dirs0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 234:
⊦ afs-cons(dirs, files) ∧ ino ∈ dirs ∧ dirs[ino] = mkdir(n, md, n0, n1, entries) → # entries = n
Proof step 235:
# links(ino1, dirs0) = dirs0[ino1].nlink, # links(entries[str], dirs0) = files[entries[str]].nlink, # entries = m0 + 1, m0 + 1 = dirs0[ino1].size, entries[str] = dirs0[ino1].entries[str], files[entries[str]] = mkfile(m, md0, files[entries[str]].nlink, content), dirs0[ino1] = mkdir(m0 + 1, md, dirs0[ino1].nlink, dirs0[ino1].nsubdirs, entries), fs = abs-files(files), entries ≠ ∅, root[q].dir?, root.dir?, dom of < ino0, abs(root, ROOT_INO)(dirs0), afs-cons(dirs0, files), fids-cons(root, abs-files(files), abs-of(of)), ispath(q, ROOT_INO, ino1, dirs0, files), of-cons(of, dirs0, files), pw(user, md), px(user, md), px-parent(user, q, ROOT_INO, dirs0, files), str ∈ dirs0[ino1].entries, entries[str] ∈ files, ino1 ∈ dirs0, str ∈ entries, dirs ≡ dirs0[ino1, (dirs0[ino1].entries:= (dirs0[ino1].entries -- str)).size:= m0], ¬ root[q + str '].dir?, ¬ entries[str] ∈ dirs, ¬ entries[str] ∈ dirs0, psynced → asynced0, links(ino1, dirs0) ≠ ∅ ∨ ino1 = ROOT_INO ⊦ [afs_drop_nlink#(mkdentry(str, entries[str]).ino; dirs, files); dent := negdentry(mkdentry(str, entries[str]).name); afs_inode_sync#(mkinode(ino1, md, true, dirs0[ino1].nlink, dirs0[ino1].nsubdirs, m0 + 1); dirs, files); afs_inode_sync#(mkinode(entries[str], md0, false, # links(entries[str], dirs0), 0, m); dirs, files); inode := (ino1 ∈ dirs ⊃ mkinode(ino1, dirs[ino1].meta, true, dirs[ino1].nlink, dirs[ino1].nsubdirs, dirs[ino1].size) ;mkinode(ino1, files[ino1].meta, false, files[ino1].nlink, 0, files[ino1].size) ); c_inode := getinode(entries[str], dirs, files); err := ESUCCESS; asynced := ?; vfs_put_inode#(c_inode, of, asynced; err, dirs, files)] ( of-cons(of, dirs, files) ∧ afs-cons(dirs, files) → ⟨posix_unlink#(q + str ', user, abs-of(of); err1, root, fs; psynced)⟩ (fs = abs-files(files) ∧ abs(root, ROOT_INO)(dirs) ∧ (psynced → asynced) ∧ err = err1))

Rule argument

Additional information

Used simplifier rules: make-abs-fold-work: ⊦ afs-cons(dirs, files) ∧ ino ∈ dirs ∧ dirs[ino] = mkdir(n, md, n0, n1, entries) → # entries = n;% ⊦ m ≤ m + n; (s)%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ m + 1 ≠ 0; (s)%not-zero: 0 < n ⊦ (* n) ≤ m → m ≠ 0; (forward) from specification nat% ⊦ # entries = 0 ↔ entries = ∅; (s)