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Xiaobian to share with you what is the use of dentry link in MDCache, I believe most people still do not know how, so share this article for everyone's reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!

The send_dentry_link() function in MDCache is responsible for sending dentry links to other MDS processes. The sender traverses the replica_map array to obtain the CDentry::linkage_t class object corresponding to CDentry, and then creates an MDentryLink class message. If the CDentry::linkage_t class object is a primary link, the replicate_inode() function is invoked to write the primary link information into the MDentryLink class message. If the CDentry::linkage_t class object is not a primary link, the remote inode number and remote entry type information are written into the MDentryLink class message. Finally, the MDentryLink message is sent to the destination MDS process.

MDCache handle_dentry_link() function handles MDentryLink messages. MDS processes that send MDentryLink messages send dentry link information to other MDS processes as MDentryLink messages by calling the send_dentry_link() function. MDS process receiving MDentryLink message first obtains CDir class object corresponding to dirfrag in message locally, and then obtains CDentry class object corresponding to dirfrag through CDir class object. If primary link is specified in the class message, call add_replica_inode() function to complete primary link operation; if primary link is not specified in the class message, call dir->link_remote_inode() function to complete remote link.

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