read_lock(&journal->j_state_lock);
jbd_debug(1, "JBD2: updating superblock (start %ld, seq %d)\n",
journal->j_tail, journal->j_tail_sequence);
read_lock(&journal->j_state_lock);
jbd_debug(1, "JBD2: updating superblock (start %ld, seq %d)\n",
journal->j_tail, journal->j_tail_sequence);