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qcow2-rs v0.1 - Coggle Diagram

- - - - do_write
        
        mapping is none
        
        l2_handle.value().write()
        
        self.allocate_cluster()
        
        self.mark_new_cluster()
        
        new_cluster lock
        
        mapping is ready
        
        do_write_data_file
        
        self.cluster_is_new(key)
        
        cls_map=self.new_cluster.read().await
        
        cls_map.get(&key).unwrap().write()
        
        4 more items...
      - flush_cache_entries()
        
        may be called with top table lock held
        
        only flush slices
        
        for both l2 and rb slices
        
        slices can stay in cache
        
        flush dirty slices
        
        or evicted from cache
        
        dirty cache is evicted from lrucache
        
        for each dirty cache slice
        
        e.value().read()
        
        e.set_dirty(false)
        
        lockless
        
        self.cluster_is_new(key)
        
        cls_map = self.new_cluster.read()
        
        cls_map.get(&key).unwrap().write()
        
        1 more item...
        
        similar with handling new cluster in do_write_data_file
      - get_mapping
        
        called in read_at() and write_at
        
        called without holding other locks
        
        self.get_l1_entry(&split)
        
        need l1 read lock
        
        self.get_l2_table
        
        fast path
        
        l2_cache.get(key)
        
        slow path
        
        self.add_l2_slice()
        
        self.add_cache_slice
        
        cache.put_into_wmap_with
        
        !slice.is_update()
        
        1 more item...
        
        cache.commit_wmap()
        
        entry.value().write().await
        
        flush evicted l2 caches
        
        flush refcount dirty meta
        
        flush this evicted l2 dirty slice
  - - - shrink
- - - - regression
- - - - more tests in github-ci