nr_journal_heads 2369 fs/jbd2/journal.c static atomic_t nr_journal_heads = ATOMIC_INIT(0);
nr_journal_heads 2401 fs/jbd2/journal.c 	atomic_inc(&nr_journal_heads);
nr_journal_heads 2416 fs/jbd2/journal.c 	atomic_dec(&nr_journal_heads);
nr_journal_heads 2717 fs/jbd2/journal.c 	int n = atomic_read(&nr_journal_heads);