- long i = s ? 1 : -1;
-
- BUG_ON(atomic_long_read(&lock->v) == 0);
-
- if (atomic_long_sub_return_release(i, &lock->v) == 0)
- wake_up_all(&lock->wait);
-}
-
-bool bch2_two_state_trylock(two_state_lock_t *lock, int s)
-{
- long i = s ? 1 : -1;
- long v = atomic_long_read(&lock->v), old;
-
- do {
- old = v;
-
- if (i > 0 ? v < 0 : v > 0)
- return false;
- } while ((v = atomic_long_cmpxchg_acquire(&lock->v,
- old, old + i)) != old);
- return true;
-}
-
-void bch2_two_state_lock(two_state_lock_t *lock, int s)
-{
- wait_event(lock->wait, bch2_two_state_trylock(lock, s));