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Proof step 2 from proof inv-rmdir (previous step)

fo.inodes?, ro.inodes?, file-node-cons(fs, ri), log-cons(log, fs), orphans-cons(fs, ri, ro), pre-rmdir(p_inode, c_inode, dent, fs, ri, ro), replay-cons-strong(fs, ri, ro, fi, fo, log), ri-inj(fi), ri-inj(ri), ubifs-cons(fs, ri, ro, fi, fo, log) ⊦ ⟪aubifs_rmdir#(fi, fo; p_inode, c_inode, dent, err, ri, ro, fs, log, boolvar)⟫ ( ubifs-cons(fs, ri, ro, fi, fo, log) ∧ replay-cons-strong(fs, ri, ro, fi, fo, log) ∧ file-node-cons(fs, ri) ∧ orphans-cons(fs, ri, ro) ∧ ri-inj(ri) ∧ log-cons(log, fs) ∧ ro.inodes?)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
fs[ri[dentrykey(p_inode.ino, dent.name)]].ino = dent.ino, c_inode.ino = dent.ino, c_inode.nlink = 1, p_inode.nlink = fs[ri[inodekey(p_inode.ino)]].nlink, p_inode.nsubdirs = fs[ri[inodekey(p_inode.ino)]].nsubdirs, c_inode.nsubdirs = fs[ri[inodekey(dent.ino)]].nsubdirs, p_inode.size = fs[ri[inodekey(p_inode.ino)]].size, c_inode.size = fs[ri[inodekey(dent.ino)]].size, 1 = fs[ri[inodekey(dent.ino)]].nlink, dentrykeys(inodekey(dent.ino), ri) = ∅, links(dent.ino, fs, ri) = ∅ ++ dentrykey(p_inode.ino, dent.name), dent.ino ≠ ROOT_INO, p_inode.nsubdirs ≠ 0, p_inode.size ≠ 0, dent.dentry?, fs[ri[inodekey(p_inode.ino)]].directory, p_inode.directory, fs[ri[inodekey(dent.ino)]].directory, c_inode.directory, ro.inodes?, fo.inodes?, file-node-cons(fs, ri), log-cons(log, fs), orphans-cons(fs, ri, ro), replay-cons-strong(fs, ri, ro, fi, fo, log), ri-inj(ri), ri-inj(fi), ubifs-cons(fs, ri, ro, fi, fo, log), dentrykey(p_inode.ino, dent.name) ∈ ri, inodekey(dent.ino) ∈ ri, inodekey(p_inode.ino) ∈ ri, 1 ≤ p_inode.nsubdirs, 1 ≤ p_inode.size, ¬ inodekey(dent.ino) ∈ ro, ¬ inodekey(p_inode.ino) ∈ ro, p_inode.nlink ≠ 0 ∨ p_inode.ino = ROOT_INO ⊦ ⟪aubifs_rmdir#(fi, fo; p_inode, c_inode, dent, err, ri, ro, fs, log, boolvar)⟫ (ubifs-cons(fs, ri, ro, fi, fo, log) ∧ replay-cons-strong(fs, ri, ro, fi, fo, log) ∧ file-node-cons(fs, ri) ∧ orphans-cons(fs, ri, ro))

Rule argument

Additional information

Used simplifier rules: ⊦ #(∅ ++ key) = 1; (s)%ubifs-parent-in: ⊦ dentrykey(ino, str) ∈ ri ∧ ubifs-cons(fs, ri, ro, fi, fo, log) → inodekey(ino) ∈ ri; (forward) from specification aubifs-inv%not-zero: 0 < n ⊦ (* n) ≤ m → m ≠ 0; (forward) from specification nat%one-size: ⊦ ks = ∅ ++ key → # ks = 1; (forward) from specification set-basic[node-index]% ⊦ ubifs-cons(fs, ri, ro, fi, fo, log) → ro.inodes?; (ss)% ⊦ ubifs-cons(fs, ri, ro, fi, fo, log) → log-cons(log, fs); (ss)% ⊦ ubifs-cons(fs, ri, ro, fi, fo, log) → ri-inj(ri); (ss)% ⊦ n ≥ m ↔ m ≤ n; (s)%⊦ dentrykey(ino, str) ∈ ri ∧ ubifs-cons(fs, ri, ro, fi, fo, log) → fs[ri[inodekey(ino)]].directory; (ss)%⊦ valid-dir-inode(inode, fs, ri) ↔ valid-dir-ino(inode.ino, fs, ri) ∧ (inode.directory ↔ fs[ri[inodekey(inode.ino)]].directory) ∧ inode.nlink = fs[ri[inodekey(inode.ino)]].nlink ∧ inode.nsubdirs = fs[ri[inodekey(inode.ino)]].nsubdirs ∧ inode.size = fs[ri[inodekey(inode.ino)]].size; (s)% ⊦ {key} = ∅ ++ key; (s)% ⊦ valid-ino(ino, fs, ri) ↔ inodekey(ino) ∈ ri; (s)%⊦ valid-dir-ino(ino, fs, ri) ↔ inodekey(ino) ∈ ri ∧ fs[ri[inodekey(ino)]].directory; (s)%⊦ valid-parent-ino(ino, fs, ri, ro) ↔ ( valid-dir-ino(ino, fs, ri) ∧ (fs[ri[inodekey(ino)]].nlink ≠ 0 ∨ ino = ROOT_INO)) ∧ ¬ inodekey(ino) ∈ ro; (s)%⊦ valid-dentry(ino, dent, fs, ri, ro) ↔ dent.dentry? ∧ valid-parent-ino(ino, fs, ri, ro) ∧ valid-ino(dent.ino, fs, ri) ∧ dentrykey(ino, dent.name) ∈ ri ∧ fs[ri[dentrykey(ino, dent.name)]].ino = dent.ino; (s)%⊦ pre-rmdir(p_inode, c_inode, dent, fs, ri, ro) ↔ dent.ino ≠ ROOT_INO ∧ valid-dentry(p_inode.ino, dent, fs, ri, ro) ∧ fs[ri[inodekey(dent.ino)]].nlink = 1 ∧ links(dent.ino, fs, ri) = {dentrykey(p_inode.ino, dent.name)} ∧ dentrykeys(inodekey(dent.ino), ri) = ∅ ∧ ¬ inodekey(dent.ino) ∈ ro ∧ valid-dir-inode(p_inode, fs, ri) ∧ valid-dir-inode(c_inode, fs, ri) ∧ c_inode.ino = dent.ino ∧ p_inode.nsubdirs ≥ 1 ∧ p_inode.size ≥ 1; (s)