jbd2_journal_start_commit
if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
EXPORT_SYMBOL(jbd2_journal_start_commit);
if (jbd2_journal_start_commit(osb->journal->j_journal, &target)) {
if (jbd2_journal_start_commit(osb->journal->j_journal,
int jbd2_journal_start_commit(journal_t *journal, tid_t *tid);