Description of problem:
For nameless LOOKUPs, server creates a new inode which shall remain invalid until the fop is successfully processed post which it is linked to the inode table.
But incase if there is an already linked inode for that entry, it discards that newly created inode which results in upcall notification. This may result in client being bombarded with unnecessary upcalls affecting performance if the data set is huge.
This issue can be avoided by looking up and storing the upcall context in the original linked inode (if exists), thus saving up on those extra callbacks.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
REVIEW: https://review.gluster.org/22840 (upcall: Avoid sending notifications for invalid inodes) posted (#1) for review on master by soumya k