Don't change the inode when editing a file with Vim
I keep my config files on github, and I use hard-link for most of the config files. It's convenient, as I can check the new changes easily and submit some of the changes when necessary. However, the default behavior of vim troubles me. It always changed the inode when I save the config file!
tldr; the solution is: put the following line in your .vimrc
set backupcopy=yes
PS
Though this way fixed Vim's behavior, I sadly found that git pull will change the config file's inode as well. So there is actually no feasible solution. I have abandoned this hard link approach. If you have better solutions to maintain all your config files in one repository, please let me know!