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Proof step 78 from proof inv-truncate-buff-none-cached (previous step)

# buf0 = VFS_PAGE_SIZE, asynced0 ↔ inode.size ≤ n ∧ old_ino ≠ 0 ∧ (pageno ∈ content ∨ buf-opt.some?), pcache[datakey(m, m2 / VFS_PAGE_SIZE)] = mkpentry(boolvar, buf0), files0[m] = mkfile(m1, md1, # links(m, dirs), content0), asynced0, buf-opt = some(buf0), content = files0[inode.ino].content, err = ESUCCESS, files = files0[ino, files0[ino].content:= (content[pageno, fill(buf-opt.buf, zero, old_ino, VFS_PAGE_SIZE - old_ino)] upto size)], ino = inode.ino, inode = mkinode(m, md, false, # links(m, dirs), 0, m2), new_inode = inode, old_ino = inode.size % VFS_PAGE_SIZE, old_ino0 = 0, pageno = m2 / VFS_PAGE_SIZE, size = min(n, inode.size), size0 = 0, buf-opt.some?, afs-cons(dirs, files0), dcache-cons(dcache, dirs, files0), icache-cons(icache, dirs, files0), pcache-cons(pcache, dirs, files0), synced(dirs, icache, pcache), datakey(m, m2 / VFS_PAGE_SIZE) ∈ pcache, m ∈ files0, old_ino + (VFS_PAGE_SIZE - old_ino) ≤ # buf-opt.buf, VFS_PAGE_SIZE ≥ old_ino, asynced2 → synced(files0, icache, pcache) ⊦ [afs_inode_sync#(new_inode.size:= n; dirs, files); inode := getinode(inode.ino, dirs, files); err := ESUCCESS; asynced := ?] ( afs-cons(dirs, files) → ⟪asynced4 := asynced0; if err = ESUCCESS then let asynced = false in {icache_set#(inode, asynced; err, icache); pcache_truncate#(inode.ino, m2, n; err, pcache); if asynced4 then pcache_set# (inode.ino, m2 / VFS_PAGE_SIZE, some(fill(buf-opt.buf, zero, old_ino, VFS_PAGE_SIZE - old_ino)).buf, asynced; err, pcache)}; if ¬ asynced4 ∨ err ≠ ESUCCESS then buf-opt0 := none⟫ ( icache-cons(icache, dirs, files) ∧ dcache-cons(dcache, dirs, files) ∧ pcache-cons(pcache, dirs, files) ∧ synced(dirs, icache, pcache) ∧ (asynced2 → synced(files, icache, pcache)))), VFS_PAGE_SIZE = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 79:
# buf0 = VFS_PAGE_SIZE, pcache[datakey(m, m2 / VFS_PAGE_SIZE)] = mkpentry(boolvar, buf0), files0[m] = mkfile(m1, md1, # links(m, dirs), content0), files = files0 [m, mkfile (m1, md1, # links(m, dirs), content0[m2 / VFS_PAGE_SIZE, fill(buf0, zero, m2 % VFS_PAGE_SIZE, VFS_PAGE_SIZE - m2 % VFS_PAGE_SIZE)] upto m2) ], inode = mkinode(m, md, false, # links(m, dirs), 0, m2), m2 % VFS_PAGE_SIZE ≠ 0, afs-cons(dirs, files0), dcache-cons(dcache, dirs, files0), icache-cons(icache, dirs, files0), pcache-cons(pcache, dirs, files0), synced(dirs, icache, pcache), datakey(m, m2 / VFS_PAGE_SIZE) ∈ pcache, m ∈ files0, m2 ≤ n, asynced2 → synced(files0, icache, pcache) ⊦ [afs_inode_sync#(mkinode(m, md, false, # links(m, dirs), 0, n); dirs, files); inode0 := (inode.ino ∈ dirs ⊃ mkinode(inode.ino, dirs[inode.ino].meta, true, dirs[inode.ino].nlink, dirs[inode.ino].nsubdirs, dirs[inode.ino].size) ;mkinode(inode.ino, files[inode.ino].meta, false, files[inode.ino].nlink, 0, files[inode.ino].size) ); err := ESUCCESS; asynced := ?] ( afs-cons(dirs, files) → ⟪asynced4 := true; if err = ESUCCESS then let asynced = false in {icache_set#(inode0, asynced; err, icache); pcache_truncate#(inode0.ino, m2, n; err, pcache); if asynced4 then pcache_set# (inode0.ino, m2 / VFS_PAGE_SIZE, some(fill(some(buf0).buf, zero, inode.size % VFS_PAGE_SIZE, VFS_PAGE_SIZE - inode.size % VFS_PAGE_SIZE)).buf, asynced ; err, pcache)}; if ¬ asynced4 ∨ err ≠ ESUCCESS then buf-opt0 := none⟫ ( icache-cons(icache, dirs, files) ∧ dcache-cons(dcache, dirs, files) ∧ pcache-cons(pcache, dirs, files) ∧ synced(dirs, icache, pcache) ∧ (asynced2 → synced(files, icache, pcache))))

Rule argument

Additional information

Used simplifier rules: ⊦ m ≤ m; (s)%⊦ mkfile(m, md, m0, content).content:= content0 = mkfile(m, md, m0, content0); (s)% ⊦ mkfile(m, md, m0, content).content = content; (s)%⊦ getinode(ino, dirs, files) = (ino ∈ dirs ⊃ mkinode (ino, dirs[ino].meta, true, dirs[ino].nlink, dirs[ino].nsubdirs, dirs[ino].size) ;mkinode (ino, files[ino].meta, false, files[ino].nlink, 0, files[ino].size) ); (s)%⊦ mkinode(m, md, boolvar, m0, m1, m2).size:= m6 = mkinode(m, md, boolvar, m0, m1, m6); (s)%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ m + n ≤ m + n0 ↔ n ≤ n0; (s)%n ≤ m ⊦ (m - n) + m0 ≤ n0 ↔ m + m0 ≤ n0 + n; (s)%n ≠ 0 ⊦ m % n ≤ n; (s)% ⊦ n ≥ m ↔ m ≤ n; (s)% ⊦ VFS_PAGE_SIZE ≠ 0; (s)%min-comm: ⊦ min(n0, n1) = min(n1, n0); from specification min-max% ⊦ n0 ≤ n1 → min(n0, n1) = n0; (s)% ⊦ some(buf).some?; (s)% ⊦ mkinode(m, md, boolvar, m0, m1, m2).size = m2; (s)% ⊦ some(buf).buf = buf; (s)% ⊦ mkinode(m, md, boolvar, m0, m1, m2).ino = m; (s)