jbd2_journal_grab_journal_head 1556 fs/jbd2/transaction.c jh = jbd2_journal_grab_journal_head(bh); jbd2_journal_grab_journal_head 1695 fs/jbd2/transaction.c jh = jbd2_journal_grab_journal_head(bh); jbd2_journal_grab_journal_head 1087 include/linux/jbd2.h struct journal_head *jbd2_journal_grab_journal_head(struct buffer_head *bh);