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

The discovery sender creates an MDiscovery message by calling the_send_discover() function, and then sends the message to the destination MDS process. discover finds base inode, Dir, Dentry, and Dentry::linkage.

The discovery receiver processes MDiscovery messages by calling handle_discover(). In this function, CInode information corresponding to base inode, CDIR information corresponding to Dir, CDentry information corresponding to Dentry, and CInode information of Inode corresponding to Dentry::linkage are respectively filled into the MDiscoverReply type message by analyzing fields in the MDiscoverReply type message. Finally, the MDiscoverReply message is sent back to the discovery sender.

The discovery sender handles the discovery reply message MDiscoverReply by calling the handle_discover_reply() function. In this function, the Inode information corresponding to base inode, Dir, Dentry and Dentry::linkage is parsed respectively, and finally the corresponding information is added to MDCache.

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