EXTENT_BUFFER_ZONED_ZEROOUT
if (test_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags)) {
clear_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &buf->bflags);
set_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags);
WARN_ON(test_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags));