How to understand Collection in Bluestore, is it a folder?

[qi Shi <m13913886148@xxxxxxxxx>]

  struct Collection : public CollectionImpl {
    BlueStore *store;
    Cache *cache;       ///< our cache shard
    coll_t cid;
    bluestore_cnode_t cnode;
    RWLock lock;

    bool exists;

    SharedBlobSet shared_blob_set;      ///< open SharedBlobs

    // cache onodes on a per-collection basis to avoid lock
    // contention.
    OnodeSpace onode_map;

    //pool options
    pool_opts_t pool_opts;
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