FSCACHE_VOLUME_CREATING
clear_and_wake_up_bit(FSCACHE_VOLUME_CREATING, &volume->flags);
if (test_and_set_bit(FSCACHE_VOLUME_CREATING, &volume->flags))
wait_on_bit(&volume->flags, FSCACHE_VOLUME_CREATING,
clear_and_wake_up_bit(FSCACHE_VOLUME_CREATING, &volume->flags);