| ⟨afs_writepage#(inode, pageno, buf, dirs; err, files; asynced)⟩ ((inode = p_inode ∧ pageno = pageno0 ∧ buf = buf0 ∧ err = err0) ∧ dirs = dirs0 ∧ files = files0 ∧ (asynced ↔ boolvar)), dirs = dirs1, files = files1 ⊦ ⟨afs_writepage#(inode, pageno, buf, dirs1; err, files1; boolvar0)⟩ ((inode = p_inode ∧ pageno = pageno0 ∧ buf = buf0 ∧ err = err0) ∧ dirs1 = dirs0 ∧ files1 = files0) |