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Proof step 36 from proof write-prepost (previous step)

afs-cons(dirs, files0), files0 = files1, pageno = inode.size / VFS_PAGE_SIZE, buf-opt.none?, inode = getinode(ino, dirs, files0), inode.size = n, inode = inode0, ¬ inode.directory, ino ∈ files0 ⊦ [afs_truncate#(n, pageno; buf-opt, inode, bv, err, dirs, files1, asynced)] ( (err = ESUCCESS ⊃ files1[ino].content.stream from n = σ⊥ ∧ (∀ n0, n1, buf. n1 ≤ # buf → write-inv(n0, n0 + n1, inode, buf, 0, dirs, files1, files1)) ∧ files0 -- ino = files1 -- ino ;⌊err⌋ ) ∧ files0 ~ files1 ∧ inode = inode0)

Lemma truncate-inv