| avol[m2] = mapped(buf0), n1 = 0, m2 < # avol, n1 < n, ebm-vol-inv(avol), is-aligned(m1, EB_PAGE_SIZE), is-aligned(n, EB_PAGE_SIZE), is-aligned(n1, EB_PAGE_SIZE), # buf0 ≤ m1, m1 + n ≤ LEB_SIZE, n2 + n ≤ # buf, ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪skip⟫ ebm-vol-inv(avol), err0 = ESUCCESS |