process_func
int (*process_func)(struct extent_buffer *eb,
ret = wc->process_func(next, wc, ptr_gen, *level - 1);
ret = wc->process_func(path->nodes[*level], wc,
ret = wc->process_func(path->nodes[orig_level], wc,
.process_func = process_one_buffer,
.process_func = process_one_buffer,
wc.process_func = replay_one_buffer;
process_func:
goto process_func;
die_callback_t process_func,
check(process_die_container(state, cache, die, process_func,
die_callback_t process_func)
check(process_func(state, cache, die));
process_func();
process_func();