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This article mainly introduces what is the use of find ino in MDCache. It is very detailed and has a certain reference value. Interested friends must finish reading it!

The find_ino_peers () function in MDCache is responsible for finding the file path corresponding to the specified inodeno_t in other MDS processes. This function creates a MMDSFindIno class message, then writes the inodeno_t to the MMDSFindIno class message, and sends the class message to the specified MDS process.

The handle_find_ino () function in MDCache is responsible for processing MMDSFindIno class messages. First, the CInode class object corresponding to the local inodeno_t is found by calling the get_inode () function, then the file path information corresponding to the CInode is written to the MMDSFindInoReply class message by calling the in- > make_path () function, and finally the MMDSFindInoReply class message is sent back to the sender.

The handle_find_ino_reply () function in MDCache is responsible for processing MMDSFindInoReply class messages. First, get the request item corresponding to the Reply class message in the find_ino_peers array. The get_inode () function is then called to find out whether the CInode already exists, and exit directly if it already exists. Otherwise, get the path information from the MMDSFindInoReply class message, then call the path_traverse () function to deploy the path in MDCache, and exit directly if the deployment is successful, otherwise call the find_ino_peers () function to resend the MMDSFindIno class message.

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