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DamageTable mainly contains Damage information of DIRFRAG/DENTRY/BACKTRACE.

The DamageEntry class is the base class of DamageTable, which contains two members (damage_entry_id_t/utime_t) corresponding to the ID value of damage_entry and the time when the Damage was recorded.

Class DamageEntry {

Damage_entry_id_t id

Utime_t reported_at

}

The DirFragDamage class inherits DamageEntry, and the information (inodeno_t/frag_t) that mainly contains DirFrag corresponds to inode and frag id, respectively. These two id values can uniquely correspond to a DirFrag.

Class DirFragDamage: public DamageEntry {

Inodeno_t ino

Frag_t frag

}

Class DentryDamage: public DamageEntry {

Inodeno_t ino

Frag_t frag

Std::string dname

Snapid_t snap_id

}

Class BacktraceDamage: public DamageEntry {

Inodeno_t ino

}

Class DirFragIdent {uniquely identifies a DirFrag

Inodeno_t ino

Frag_t frag

}

Class DentryIdent {uniquely identifies a Dentry

Std::string dname

Snapid_t snap_id

}

Class DamageTable {

Std::map dirfrags; records damaged dirfrages information

Std::map dentries; records damaged dentries information

Std::map remotes; records remote damaged information

All damged information is recorded by std::map by_id; and indexed by id

Const mds_rank_t rank

}

DamgeTable::notify_dentry ()

| | _ _ create DamageEntry class object |

| | _ _ insert DamageEntry class objects into the dentries array |

| | _ _ insert DamageEntry class objects into the by_id array |

DamageTable::notify_dirfrag ()

| | _ _ create DamageEntry class object |

| | _ _ insert DamageEntry class objects into the dirfrags array |

| | _ _ insert DamageEntry class objects into the by_id array |

DamageTable::notify_remote_damaged ()

| | _ _ create BackTraceDamage class object |

| | _ _ insert BackTraceDamage class objects into the remotes array |

| | _ _ insert BackTraceDamage class objects into the by_id array |

DamageTable::is_*_damaged ()

| | _ _ find the corresponding item from the corresponding dmaged array (dirfrags/dentries/remotes) |

DamageTable::erase ()

| | _ _ according to the type of Damage item to be deleted, call dirfrags.erase () / dentries.erase () / remotes.erase () to delete the item. |

| | _ _ deletes the specified entry from the by_id array |

The correspondence between DamageTable and its subclasses is shown in the following figure:

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