journal_write
struct journal_write *w = bio->bi_private;
static CLOSURE_CALLBACK(journal_write);
struct journal_write *w = (j->cur == j->w)
continue_at_nobarrier(cl, journal_write, bch_journal_wq);
struct journal_write *w = c->journal.cur;
continue_at(cl, journal_write, bch_journal_wq);
static CLOSURE_CALLBACK(journal_write)
struct journal_write *w = c->journal.cur;
static struct journal_write *journal_wait_for_write(struct cache_set *c,
struct journal_write *w = c->journal.cur;
struct journal_write *w;
struct journal_write w[2], *cur;