EXTENT_BUFFER_UPTODATE
clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
WARN_ON(test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags));
if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
if (unlikely(test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))) {
if (unlikely(!test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)))
return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);