| # apebs0 = # wlar, # apebs = # wlar, # wlar1 = # wlar, vols[v][m] = ⌜vtblpnum2⌝ , wlar[vtblpnum2] = wl-entry(m1, used), wlar[vtblpnum1] = wl-entry(m4, free), apebs[vtblpnum2] = mkpeb(aechdr(m1), avidhdr(v0, m3, valid-sqns(v, m, apebs).max, m5, m6), buf, m2, false), apebs0[vtblpnum1] = mkpeb(aehdr, avhdr, buf, align↑(datasize(buf, LEB_SIZE), EB_PAGE_SIZE), boolvar), wlar1[vtblpnum2] = wl-entry(m1, stat), wlar1[vtblpnum1] = wl-entry(m4, stat0), ecs(wlar1) = ecs(wlar), Δ wlar1 = Δ wlar, vtblpnum2 < # wlar, vtblpnum1 < # wlar, m < # vols[v], bflipset-cons(bflipset, wlar1), bflipset-cons(bflipset0, wlar), id(apebs0, apebs, mapped-pebs(vols)), id○(apebs0, apebs, vtblpnum1), is-aligned(LEB_SIZE, EB_PAGE_SIZE), ubi-io-inv(apebs0), ubi-io-inv(apebs), ubi-io-peb-inv(mkpeb(aechdr(m1), avidhdr(v0, m3, valid-sqns(v, m, apebs).max, m5, m6), buf, m2, false)), ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf, align↑(datasize(buf, LEB_SIZE), EB_PAGE_SIZE), boolvar)), unique-sqns(apebs0), unique-sqns(apebs), valid-ebatbl(apebs0, wlar1, vols[v, vols[v][m, ⌜vtblpnum1⌝ ]], n0), valid-eraseq(q + eq-entry(vtblpnum2, v × m) '), valid-eraseq(wlar1, q + eq-entry(vtblpnum2, v × m) '), valid-eraseq(apebs0, q + eq-entry(vtblpnum2, v × m) '), valid-eraseq(q), valid-eraseq(wlar, q), valid-eraseq(apebs, q), valid-global-sqn(apebs0, n), valid-global-sqn(apebs, n1), valid-peb(v, m, mkpeb(aechdr(m1), avidhdr(v0, m3, valid-sqns(v, m, apebs).max, m5, m6), buf, m2, false)), valid-vtbl(apebs0, vols, wlar1, n0), valid-vtbl(apebs, vols, wlar, n2), valid-wl(apebs0, wlar1), v ∈ vols, m1 + WL_THRESHOLD ≤ m4 ⊦ [ubi_erase_worker_helper#(vtblpnum2; wlar1, apebs0; err); q0 := q + eq-entry(vtblpnum2, v × m) '; if err = ESUCCESS then q0 := q0.butlast] ( # apebs0 = # wlar1 ∧ unique-sqns(apebs0) ∧ valid-global-sqn(apebs0, n) ∧ valid-wl(apebs0, wlar1) ∧ valid-eraseq(q0) ∧ valid-eraseq(wlar1, q0) ∧ valid-eraseq(apebs0, q0) ∧ bflipset-cons(bflipset, wlar1) ∧ valid-ebatbl(apebs0, wlar1, vols[v, vols[v][m, ⌜vtblpnum1⌝ ]], n0) ∧ valid-vtbl(apebs0, vols, wlar1, n0) ∧ ubi-io-inv(apebs0) ∧ ( vols = vols[v, vols[v][m, ⌜vtblpnum1⌝ ]] ∧ id(apebs0, apebs, mapped-pebs(vols[v, vols[v][m, ⌜vtblpnum1⌝ ]])) ∧ q0.lebrefs ⊆ q.lebrefs ++ (VTBL_VOLID × VTBL_LNUM) ∨ (∃ v0, m0, n. v0 ∈ vols ∧ m0 < # vols[v0] ∧ vols[v0][m0] ≠ unmapped ∧ vols[v, vols[v][m, ⌜vtblpnum1⌝ ]] = vols[v0, vols[v0][m0, ⌜n⌝ ]] ∧ id(apebs0, apebs, mapped-pebs(vols) -- vols[v0][m0].pnum) ∧ apebs0[n].data = apebs[vols[v0][m0].pnum].data ∧ apebs0[n].fill ≤ apebs[vols[v0][m0].pnum].fill ∧ q0.lebrefs ⊆ q.lebrefs ++ (v0 × m0))) → err = ESUCCESS → Δ wlar1 < Δ wlar), vtblpnum1 = vtblpnum2, vtblpnum2 = n2, VTBL_VOLID ∈ vols |
# wlar1 = # wlar, # apebs = # wlar, # apebs0 = # wlar, wlar1[vtblpnum1] = wl-entry(m4, stat0), wlar1[vtblpnum2] = wl-entry(m1, stat), apebs0[vtblpnum1] = mkpeb(aehdr, avhdr, buf, align↑(datasize(buf, LEB_SIZE), EB_PAGE_SIZE), boolvar), apebs[vtblpnum2] = mkpeb(aechdr(m1), avidhdr(v0, m3, valid-sqns(v, m, apebs).max, m5, m6), buf, m2, false), wlar[vtblpnum1] = wl-entry(m4, free), wlar[vtblpnum2] = wl-entry(m1, used), vols[v][m] = ⌜vtblpnum2⌝ , ecs(wlar1) = ecs(wlar), Δ wlar1 = Δ wlar, vtblpnum1 ≠ vtblpnum2, vtblpnum2 ≠ n2, m < # vols[v], vtblpnum1 < # wlar, vtblpnum2 < # wlar, bflipset-cons(bflipset0, wlar), bflipset-cons(bflipset, wlar1), id(apebs0, apebs, mapped-pebs(vols)), id○(apebs0, apebs, vtblpnum1), is-aligned(LEB_SIZE, EB_PAGE_SIZE), ubi-io-inv(apebs), ubi-io-inv(apebs0), ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf, align↑(datasize(buf, LEB_SIZE), EB_PAGE_SIZE), boolvar)), ubi-io-peb-inv(mkpeb(aechdr(m1), avidhdr(v0, m3, valid-sqns(v, m, apebs).max, m5, m6), buf, m2, false)), unique-sqns(apebs), unique-sqns(apebs0), valid-ebatbl(apebs0, wlar1, vols[v, vols[v][m, ⌜vtblpnum1⌝ ]], n0), valid-eraseq(apebs, q), valid-eraseq(wlar, q), valid-eraseq(q), valid-eraseq(apebs0, q + eq-entry(vtblpnum2, v × m) '), valid-eraseq(wlar1, q + eq-entry(vtblpnum2, v × m) '), valid-eraseq(q + eq-entry(vtblpnum2, v × m) '), valid-global-sqn(apebs, n1), valid-global-sqn(apebs0, n), valid-peb(v, m, mkpeb(aechdr(m1), avidhdr(v0, m3, valid-sqns(v, m, apebs).max, m5, m6), buf, m2, false)), valid-vtbl(apebs, vols, wlar, n2), valid-vtbl(apebs0, vols, wlar1, n0), valid-wl(apebs0, wlar1), v ∈ vols, m1 + WL_THRESHOLD ≤ m4, ¬ VTBL_VOLID ∈ vols ⊦ [ubi_erase_worker_helper#(vtblpnum2; wlar1, apebs0; err); q0 := q + eq-entry(vtblpnum2, v × m) '; if err = ESUCCESS then q0 := q0.butlast] ( # apebs0 = # wlar1 ∧ unique-sqns(apebs0) ∧ valid-global-sqn(apebs0, n) ∧ valid-wl(apebs0, wlar1) ∧ valid-eraseq(q0) ∧ valid-eraseq(wlar1, q0) ∧ valid-eraseq(apebs0, q0) ∧ bflipset-cons(bflipset, wlar1) ∧ valid-ebatbl(apebs0, wlar1, vols[v, vols[v][m, ⌜vtblpnum1⌝ ]], n0) ∧ valid-vtbl(apebs0, vols, wlar1, n0) ∧ ubi-io-inv(apebs0) ∧ ( vols = vols[v, vols[v][m, ⌜vtblpnum1⌝ ]] ∧ id(apebs0, apebs, mapped-pebs(vols[v, vols[v][m, ⌜vtblpnum1⌝ ]])) ∧ q0.lebrefs ⊆ q.lebrefs ++ (VTBL_VOLID × VTBL_LNUM) ∨ (∃ v0, m0, n. v0 ∈ vols ∧ m0 < # vols[v0] ∧ vols[v0][m0] ≠ unmapped ∧ vols[v, vols[v][m, ⌜vtblpnum1⌝ ]] = vols[v0, vols[v0][m0, ⌜n⌝ ]] ∧ id(apebs0, apebs, mapped-pebs(vols) -- vols[v0][m0].pnum) ∧ apebs0[n].data = apebs[vols[v0][m0].pnum].data ∧ apebs0[n].fill ≤ apebs[vols[v0][m0].pnum].fill ∧ q0.lebrefs ⊆ q.lebrefs ++ (v0 × m0))) → err = ESUCCESS → Δ wlar1 < Δ wlar)