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This article is about how to use the ESubtreeMap class. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

The ESubtreeMap class description:

Class ESubtreeMap: public LogEvent {EMetaBlob metablob; map subtrees; set ambiguous_subtrees; uint64_t expire_pos; uint64_t event_seq;}:

ESubtreeMap class methods:

ESubtreeMap::replay (mds)

| | _ _ if expire _ pos is valid and is larger than the expire pos of journaler in the current MDLog |

| | _ _ sets the journaler expire posvalue of MDLog, that is, mds- > mdlog- > journaler- > set_expire_pos (expire_pos) |

| | _ _ if MDCache is subtrees |

| | _ _ traverses subtrees |

| | _ _ get the CDir corresponding to subtree_root from MDCache |

| | _ _ check whether the CDir corresponding to subtree root is subtree |

| | _ _ traverses all dirfrags under subtree_root |

| | _ _ perform get_force_dirfrag operation in MDCache, that is, mds- > mdcache- > get_force_dirfrag () |

| | _ _ get the subtree bound of subtree_root in MDCache, that is: mds- > mdcache- > get_subtree_bound () |

| | _ _ traverses all dirfrags under subtree_root |

| | _ _ remove dirfrags from subtree bound array |

| | _ _ if the array contains subtree_root _ subtrees |

| | _ _ check whether the MDCache contains subtree_root in the ambiguous, that is, mds- > mdcache- > have_ambiguous_import () |

| | _ _ if subtree_root _ subtrees array does not contain subtree_root |

| | _ _ check whether the MDCache contains subtree_root in the ambiguous, that is, mds- > mdcache- > have_ambiguous_import () |

| | _ _ get subtrees from MDCache, that is: mds- > mdcache- > list_subtrees () |

| | _ _ traverses the subtrees in MDCache |

| | _ _ check whether the subtrees of the MDCache is in the subtrees collection of the ESubtreeMap class |

| | _ _ perform EMetaBlob::replay operation |

| | _ _ traverse the subtrees array |

| | _ _ get the CDir corresponding to subtree_root from MDCache |

| | _ _ check whether subtree_root is in the ambiguous_subtrees array |

| | _ _ add ambiguous information to MDCache, that is, mds- > mdcache- > add_ambiguous_import () |

| | _ _ adjust subtree auth in MDCache, that is, mds- > mdcache- > adjust_bounded_subtree_auth () |

| | _ _ subtree_root is not in the ambiguous_subtrees array |

| | _ _ adjust subtree auth in MDCache, that is, mds- > mdcache- > adjust_bounded_subtree_auth () |

| | _ _ execute recalc auth bits in MDCache, namely: mds- > mdcache- > recalc_auth_bits () |

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