ext4_buffer_uptodate
if (!bh || ext4_buffer_uptodate(bh))
if (bhs[i] && !ext4_buffer_uptodate(bhs[i]))
if (ext4_buffer_uptodate(bh))
if (ext4_buffer_uptodate(bh)) {
if (ext4_buffer_uptodate(bh)) {
if (ext4_buffer_uptodate(bh)) {
if (ext4_buffer_uptodate(bh))
if (!ext4_buffer_uptodate(bh)) {